CN101061978B - absorbent article - Google Patents

Abstract

An absorbent article (1) comprising an absorbent main body (10) having an absorbent layer (11) and a leak-proof layer (12) and having a substantially elongated shape, wherein the absorbent main body (10) contacts the skin A pair of side leak-proof parts (5, 5) are provided on both sides in the length direction of one side of the surface, and the pair of side leak-proof parts (5, 5) are respectively formed by a bulky non-woven fabric (50) with concavities and convexities, without The spun cloth (50) is stacked in two layers in such a manner that the surfaces (50a, 50a') having the above-mentioned concavo-convexities face each other, and in the opposing surfaces (50a, 50a'), the convex parts on one surface are aligned with the convex parts on the other surface. Convex contact.

Description

absorbent article

technical field

The present invention relates to sanitary napkins, panty liners, incontinence pads and other absorbent articles.

Background technique

Conventionally, absorbent articles such as sanitary napkins are provided with a pair of side leakage preventers. In this absorbent article, in order to prevent side leakage from both sides of the absorbent main body having the absorbent layer and the leak-proof layer, a pair of side leak-proof parts are provided on both sides of the side of the skin-contacting surface of the absorbent main body. Leaky part. Accordingly, regions for suppressing liquid diffusion are formed on both sides in the longitudinal direction of the skin-contacting surface side of the absorbent article, and in some cases three-dimensional walls are formed to prevent liquid from moving laterally.

Furthermore, Japanese Patent Application Publication No. 11-514551 proposes a sanitary napkin having a pair of side leak-proof portions, wherein the side leak-proof portions are composed of a flexible member and an elastic member that generate compression resistance and bending resistance.

Japanese Patent Application Publication No. 11-514551 discloses the following sanitary napkin: an absorbent main body having an absorbent layer and a leak-proof layer, which is substantially elongated, and has a skin-contacting surface of the above-mentioned absorbent main body. A pair of side leak-proof parts are provided on both sides in the longitudinal direction of the side, and the pair of side leak-proof parts respectively have a flexible member and an elastic member that generate compression resistance and bending resistance to the side leak-proof part, and the elastic member has a first part and a The second portion, the first portion of the elastic member and the second portion are visually distinct from each other, the second portion has a plurality of raised rib-shaped portions, the first portion has at least two substantially planar portions, the elastic member Fold in a C shape around the flexible part.

In addition, Japanese Patent Application Publication No. 11-299821 discloses a sanitary napkin having good fit, excellent wrinkle resistance and leak resistance.

The applicant previously proposed the following sanitary napkins in Japanese Patent Application Publication No. 11-299821: a liquid-permeable front layer, a liquid-impermeable leak-proof layer, and a layer between the two layers. The liquid-retaining absorbent layer is formed into a substantially elongated shape, and the left and right sides of the absorbent article are positioned so that the two sides are located on the inner side of the absorbent article than the sides of the absorbent layer Belt-shaped elastic sheets are respectively provided, and a pair of left and right ring-shaped hollow portions are formed by the elastic sheets.

In addition, Japanese Unexamined Patent Publication No. 2001-145667 discloses a sanitary napkin provided with a liquid-permeable front sheet disposed on the front, a back sheet, and an absorbent sheet sandwiched between the two sheets. layer and side leak-proof parts extending longitudinally on both sides in the width direction of the front side, the side leak-proof part has a side wall part standing from the front side and a skin-adhering part extending from the upper end of the side wall part toward the outside in the width direction , the middle part of the height direction of the side wall is provided with a fold-in induction part along the longitudinal direction, and when the skin-adhering part is squeezed on the front, the fold-in inducement will fold the side wall in the outside of the width direction. . The side leak-proof part is formed by folding the non-woven fabric heat-pressed into a wavy shape, which stabilizes its three-dimensional shape.

Contents of the invention

The absorbent article according to the first aspect of the present invention has an absorbent main body having an absorbent layer and a leak-proof layer, and has a substantially elongated shape. A pair of side leak-proof parts are provided, and the above-mentioned pair of side leak-proof parts are respectively formed by bulky non-woven fabrics having concavities and convexities. The convex portion on one of the two surfaces is in contact with the convex portion on the other surface.

The absorbent article according to the second aspect of the present invention has an absorbent main body having an absorbent layer and a leak-proof layer, and has a substantially elongated shape. A pair of side leak-proof parts are provided; the pair of side leak-proof parts are respectively formed as follows: the sheet is formed from the side leak-proof parts having a large number of embossed parts according to the folded-back end part on the inner side of the width direction of the above-mentioned absorbent main body. The above-mentioned side leak-proof part forming sheet is folded back to the outside of the above-mentioned width direction of the above-mentioned absorbent main body; the above-mentioned embossing part is not formed at the front end of the above-mentioned folded-back end part, and the above-mentioned side leak-proof part forming sheet is made of two or more sheets. The non-woven fabric is laminated and formed by joining and integrating a large number of embossed parts; the non-embossed part protrudes outward by forming the above-mentioned embossed parts.

The absorbent article according to the third aspect of the present invention has an absorbent main body having an absorbent layer and a leak-proof layer, and has a substantially elongated shape, wherein both sides in the longitudinal direction of the skin-contacting surface side of the absorbent main body are A pair of side leak-proof parts are provided; the pair of side leak-proof parts are respectively formed as follows: the sheet is formed from the side leak-proof parts having a large number of embossed parts according to the folded-back end part on the inner side of the width direction of the above-mentioned absorbent main body. The above-mentioned side leak-proof part forming sheet is folded back to the outer side of the above-mentioned width direction of the above-mentioned absorbent main body; the above-mentioned embossed parts protrude from the opposite inner surface sides of the folded-back above-mentioned side leak-proof part forming sheet; The respective front ends of the flower parts are formed in a planar shape, and the planar part is thinned.

Description of drawings

Fig. 1 is a perspective view showing a first embodiment of a sanitary napkin as an absorbent article according to the first aspect of the present invention.

Fig. 2 is a sectional view taken along line X-X in Fig. 1 .

Fig. 3 is an enlarged perspective view showing a part of the nonwoven fabric forming the side leakage preventing portion of the embodiment shown in Fig. 1 .

Fig. 4 is a cross-sectional view taken along line Y-Y in Fig. 3, showing a state in which convex portions contact each other after the nonwoven fabric shown in Fig. 3 is folded in half.

Fig. 5 (a) and Fig. 5 (b) are the figure that will form the non-woven fabric of the side leakage preventing part of the sanitary napkin of the second embodiment enlarged, and Fig. 5 (a) is equivalent to Fig. 3 As a perspective view, Fig. 5(b) is a Z-Z line sectional view of Fig. 5(a).

Fig. 6 is a sectional view corresponding to Fig. 2 showing another embodiment of the present invention.

Fig. 7 is a sectional view corresponding to Fig. 2 showing still another embodiment of the present invention.

Fig. 8 is a perspective view showing an embodiment of a sanitary napkin as an absorbent article according to the second invention of the present invention.

Fig. 9 is a sectional view taken along line X-X in Fig. 8 .

Fig. 10 (a) and Fig. 10 (b) are the sectional views of a part of the side leak-proof portion of the sanitary napkin shown in Fig. (b) is a folded-back end.

Fig. 11 is a partial plan view showing an unfolded state of a side leakage preventing portion forming sheet forming a side leakage preventing portion of the sanitary napkin shown in Fig. 8 .

Fig. 12(a) - Fig. 12(d) are schematic diagrams of main parts of the first embodiment of the manufacturing method of the absorbent article of the present invention.

Fig. 13(a) - Fig. 13(d) are schematic diagrams of main parts of the second embodiment of the manufacturing method of another absorbent article of the present invention.

Fig. 14 is a perspective view showing an embodiment of a sanitary napkin as an absorbent article according to a third aspect of the present invention.

Fig. 15 is a sectional view taken along line X-X in Fig. 14 .

Fig. 16 is an enlarged cross-sectional view showing a part of a side leakage preventing portion of the sanitary napkin shown in Fig. 14 .

Fig. 17 is an enlarged plan view showing the vicinity of the inner edge of the side leakage preventing portion of the sanitary napkin shown in Fig. 14 .

Fig. 18 is a partial plan view showing the unfolded state of the side leakage preventing portion forming sheet forming the side leakage preventing portion of the sanitary napkin shown in Fig. 14 .

Fig. 19(a) and Fig. 19(b) are explanatory diagrams of a manufacturing method of a preferable absorbent article of the present invention.

Fig. 20 is a plan view corresponding to Fig. 18 showing a modified example of the absorbent article of the present invention.

Detailed ways

In the side leak-proof portion of the sanitary napkin described in JP-A-11-514551, the elastic member that comes into contact with the skin of the wearer of the sanitary napkin is formed of a thin film, and the wearing comfort is poor. In addition, the rib-shaped part is hollow, and the elastic member itself does not have the stability of the three-dimensional shape, so a flexible member is required as a supporting material.

In addition, in the sanitary napkin described in Japanese Patent Application Publication No. 11-299821, there is a hollow ring made of an elastic sheet as a side leak-proof part, but since the side leak-proof part is hollow, it cannot be adjusted in its three-dimensional shape. There is room for further improvement in terms of stability.

Therefore, the first aspect of the present invention relates to an absorbent article having a side leakage preventing portion that has a simple structure and is excellent in stability of three-dimensional shape and wearing comfort.

Moreover, the 2nd invention of this invention relates to the absorbent article which has the side leakproof part excellent in wearing comfort and the stability of a three-dimensional shape.

In addition, in the side leak-proof portion of the sanitary napkin described in JP-A-2001-145667, the fibers of the nonwoven fabric are strongly compressed by hot pressing to form wave-shaped tops and bottoms. Therefore, when the sanitary napkin is worn, the hard top part is in contact with the wearer's skin, so it is considered that the wearing comfort of the side leakage preventing part is not good.

Therefore, the third aspect of the present invention relates to an absorbent article having a side leakage preventing portion having a simple structure and excellent wearing comfort and stability of a three-dimensional shape.

The first aspect of the present invention relates to an absorbent article comprising an absorbent main body having an absorbent layer and a leak-proof layer and having a substantially elongated shape, wherein a skin-contacting surface of the absorbent main body has a A pair of side leak-proof parts are provided on both sides in the longitudinal direction of the side, and the above-mentioned pair of side leak-proof parts are respectively formed by a bulky non-woven fabric having irregularities, and the above-mentioned non-woven fabrics are overlapped in such a manner that the surfaces having the aforementioned irregularities face each other. It is formed into two layers, and the convex part on one of the two opposing surfaces is in contact with the convex part on the other surface.

The second aspect of the present invention relates to an absorbent article comprising an absorbent main body having an absorbent layer and a leak-proof layer, and having a substantially elongated shape, wherein on the skin-contacting surface of the absorbent main body, one A pair of side leak-proof parts are provided on both sides in the longitudinal direction of the side, and the above-mentioned pair of side leak-proof parts are respectively formed by a side leak-proof part having a large number of embossed parts. In the method of folding back the end portion, the above-mentioned side leak-proof portion forming sheet is folded back to the outer side of the above-mentioned width direction of the above-mentioned absorbent main body, and the above-mentioned embossing portion is not formed at the front end of the above-mentioned folded-back end portion, and the above-mentioned side leak-proof portion forming sheet The material is formed by laminating two or more non-woven fabrics and joining and integrating a large number of embossed parts, and the non-embossed part is raised outward by forming the above-mentioned embossed parts.

A third aspect of the present invention relates to an absorbent article comprising an absorbent main body having an absorbent layer and a leak-proof layer, and having a substantially elongated shape, wherein a skin contact surface of the absorbent main body is one A pair of side leak-proof parts are provided on both sides in the longitudinal direction of the side, and the above-mentioned pair of side leak-proof parts are respectively formed by a side leak-proof part having a large number of embossed parts. The side leakage preventing portion forming sheet is folded back to the outer side of the absorbent main body in the width direction by folding back the end portion, and the embossed portions are formed on opposite inner surfaces of the folded side leakage preventing portion forming sheet. One side protrudes, each front-end|tip of said embossing part is formed in planar shape, and this planar part is thinned.

According to the absorbent article having the side leakage preventing portion of the first invention of the present invention, the side leakage preventing portion has a simple structure and is excellent in three-dimensional shape stability and wearing comfort.

According to the absorbent article having the side leakage preventing portion of the second invention of the present invention, the side leakage preventing portion has excellent wearing comfort. In addition, by folding back the side leak preventing portion forming sheet in such a manner that the non-embossed portions on the opposite inner surfaces of the side leak preventing portion forming sheet contact each other, the stability and stability of the three-dimensional shape of the side leak preventing portion can be improved. Wearing comfort.

According to the absorbent article having the side leakage preventing portion of the third invention of the present invention, the side leakage preventing portion has a simple structure and excellent wearing comfort. In addition, by turning back the side leak preventing portion forming sheet in such a manner that the embossed portions on the opposite inner surfaces of the side leak preventing portion forming sheet are in contact with each other, the stability of the three-dimensional shape of the side leak preventing portion and wearing can be improved. comfortability.

Hereinafter, a preferred first embodiment of the absorbent article of the first aspect of the present invention will be described with reference to FIGS. 1-4 .

As shown in Figures 1 and 2, the absorbent article 1 of this embodiment is a sanitary napkin, comprising an absorbent main body 10 having a liquid-retentive absorbent layer 11 and a liquid-impermeable leak-proof layer 12, and It is substantially elongated. The absorbent layer 11 in the sanitary napkin 1 is composed of a liquid-permeable top sheet 2 and a liquid-retentive absorbent body 4, and the leak-proof layer 12 is composed of a back sheet 3 having air permeability and liquid impermeability.

In addition, in the sanitary napkin 1 of the present embodiment, a pair of side leakage preventers 5, 5 are provided on both sides in the longitudinal direction of the skin-contacting surface side of the absorbent main body 10 to cover the sides. The pair of side leak-proof parts 5, 5 are respectively formed by a bulky non-woven fabric 50 having concavities and convexities. , 50a', the convex portion 53 on one surface is in contact with the convex portion 53' on the other surface.

The sanitary napkin 1 of this embodiment will be further described in detail below. The front sheet 2 and the back sheet 3 each have a vertically elongated shape, and their longitudinal direction coincides with the longitudinal direction of the sanitary napkin 1 . The absorber 4 has a vertically long shape, and its longitudinal direction coincides with the longitudinal direction of the sanitary napkin 1 , and is sandwiched and fixed between the top sheet 2 and the back sheet 3 . The width of the top sheet 2 is formed substantially the same as the width of the absorber 4 and narrower than the width of the back sheet 3 . The topsheet 2 covers the entire surface area of the absorber 4 on the skin-contacting side. The front sheet 2 and the back sheet 3 protrude from both ends in the longitudinal direction of the absorber 4, and are joined to each other at the protruding portions by known joining methods such as heat sealing and bonding with an adhesive.

In addition, as shown in FIG. 2, the sanitary napkin 1 has a pair of wings 6, 6 protruding from both sides in the longitudinal direction of the absorbent main body 10. 5 The extended non-woven fabric 50 is formed.

Next, the pair of side leakage prevention parts 5, 5 in the sanitary napkin 1 of this embodiment will be further described. As shown in FIG. 1 , the pair of side leakage preventing portions 5 , 5 are each formed in a vertically elongated shape, and the longitudinal direction thereof is aligned with the sanitary napkin 1 . Moreover, a pair of side leak prevention parts 5 and 5 are respectively arrange|positioned over between the both ends of the sanitary napkin's longitudinal direction.

As shown in Fig. 2, the non-woven fabric 50 respectively forming a pair of side leak-proof parts 5, 5 is folded back toward the absorbent layer 11 side on the inner side in the width direction of the sanitary napkin, and the folded-back end forms the inside of the side leak-proof part 5. Side portion 51 . In addition, the front end portion of the folded nonwoven fabric 50 is joined to the top sheet 2 at the seal portion 9 . The side leakage preventing portion 5 is joined to the back sheet 3 via the seal portion 8 in the vicinity of the end portion in the width direction of the back sheet 3 . The sealing portion 8 and the sealing portion 9 are formed by a known joining method such as heat sealing and bonding with an adhesive.

The portion between the inner edge portion 51 and the sealing portion 9 in the non-woven fabric 50 on the non-skin-contacting side of the folded back is not joined to the front sheet 2, forming a three-dimensional barrier, and then forming a groove described later. 7. The absorbent layer 11 sinks around the groove 7 to increase the three-dimensionality, and the liquid flowing from the inner side in the width direction of the sanitary napkin to the front sheet 2 is prevented from continuing to move in the side leak-proof portion 5 . In addition, at both ends in the longitudinal direction of the sanitary napkin, the portion between the inner side portion 51 and the sealing portion 9 of the non-woven fabric 50 on the side of the non-skin contacting surface that has been folded is spread over substantially the entire surface or at the inner side portion 51. The vicinity of the top sheet 2 is joined (not shown).

As shown in FIG. 2 , the pair of side leakage preventing portions 5 , 5 are joined to the back sheet 3 at seal portions 8 in the vicinity of both sides in the longitudinal direction of the absorbent main body 10 as described above. The shape of the sealing portion 8 has a shape that is tightened toward the inner side of the width direction of the sanitary napkin at the central portion in the longitudinal direction, so that when the continuous wing portion 6 is bent along the edge of the crotch of the underwear, the wing portion 6 is easily connected to the underwear crotch. The edge of the crotch of the panty is matched.

The respective widths of the pair of side leak preventing portions 5, 5 preferably have the following dimensions from the viewpoint of obtaining good leak resistance and wearing comfort. The sealing portion measured along the surface of the side leak-proof portion 5 in the width direction of the sanitary napkin on the center line of the wing portion 6 in the longitudinal direction of the portion provided with the pair of wing portions 6, 6 in the longitudinal direction of the sanitary napkin The length between 8 and the edge on one side of the inner side portion 51 is preferably 10-30 mm, particularly preferably 15-25 mm.

The nonwoven fabric 50 forming the side leakage preventing portion 5 is formed by embossing both sides of a bulky nonwoven fabric, and has protrusions 53 on both sides as shown in FIGS. 2 and 3 .

In the nonwoven fabric 50, the joint part 52 formed by embossing is arrange|positioned in what is called a zigzag pattern, and each joint part 52 is formed discontinuously in planar view circular shape. The joining portion 52 is compacted, has a smaller thickness and a higher density than other portions of the nonwoven fabric 50 , and forms a concave portion.

As shown in FIG. 3 , the portion between the joining parts 52 (in detail, the substantially rectangular part having the joining parts 52 at the four corners) is formed into a convex shape (semispherical shape), whereby the nonwoven fabric 50 is formed on both sides of the nonwoven fabric 50. A large number of protrusions 53 are formed on it. The inside of each convex part 53 is filled with the fiber which comprises the nonwoven fabric 50, and the convex part 53 is the state filled with a fiber material. On both surfaces of the nonwoven fabric 50, individual convex portions 53 are distributed and arranged.

From the standpoint of improving the three-dimensionality of the side leak-proof part 5 to improve the leak-proofness and simultaneously obtaining the good wearing comfort of the side leak-proof part 5, the mass per unit area of the non-woven fabric 50 is preferably 20-100 g/m ² , Particularly preferred is 25-50 g/m ² .

The measurement of the mass per unit area is measured as follows, for example. Cut the non-woven fabric 50 into a size of 10 mm × 10 mm or more, preferably cut into a size of 30 mm × 30 mm or more, cut a measurement piece with a total area of 250 mm ^or more from a sanitary napkin, and use an electronic balance with a minimum display of 1 mg. The weight of the sheet was measured, and the mass per unit area was obtained by conversion. In order to improve the measurement accuracy of the mass per unit area, it is preferable to cut out measurement pieces from a plurality of sanitary napkins, and obtain the average value of the measured values at 5 or more points.

From the same viewpoint as above, the height T (see FIG. 4 ) of the convex portion 53 in the nonwoven fabric 50 is preferably 0.3-5 mm, particularly preferably 0.5-3 mm. In addition, the height T of the convex portion 53 on the inner surface side and the height T ₁ of the convex portion 53 on the outer surface side bounded by the joint portion 52 are preferably T Higher or equal to _T1 .

Here, the height T of the convex part 53 is measured as follows, for example. First, a test piece having a vertical and horizontal length of 10 mm×10 mm or more is cut out from the nonwoven fabric 50 . Then, a cut plane is made using a line passing through the joint portion 52 and the convex portion 53 . An enlarged photograph of this section was obtained with a microscope (manufactured by KEYENCE Corporation, VH-8000). The height T from the top to the bottom of the convex portion 53 (the upper surface of the adjacent joint portion 52 ) was measured according to the scale of the enlarged photograph (see FIG. 4 ). The height T is obtained by measuring the inner surface 50a side of the nonwoven fabric 50 protruding inward in the width direction of the sanitary napkin on the side of the skin contacting surface. The folded non-woven fabric on the side of the non-skin contact surface may be bonded to the front sheet, etc., so it is not suitable for height measurement. In addition, it is preferable to use the KES-G5 HANDY-TYPECOMPRESSION TESTER (KATO TECH Co., Ltd.) of the KES measurement system to measure the thickness T ₀ (thickness under a load of 0.5 g/cm ² ) before measuring the profile, and confirm the thickness T _Z (see Figure 4) is 90-110% of the thickness _T0 , if it is less than 90% or more than 140%, change the measurement site, if it is 110-130%, then clamp the sample in two plates to adjust the thickness, and pass Enlarge the photo to measure the height T.

In addition, from the viewpoint of easily bending or bending the nonwoven fabric 50 and forming a large number of protrusions 53 at the same time, in the nonwoven fabric 50, the length between the closest joining parts 52 (the distance between the centers of the joining parts) ) is preferably 1-10 mm, particularly preferably 2-7 mm.

As shown in FIG. 3 , a plurality of rows in which the protrusions 53 and the joints 52 are alternately arranged are formed on the above-mentioned nonwoven fabric 50 . Although the nonwoven fabric 50 is bulky, it becomes easy to bend or bend by providing the joining part 52 as a recessed part. In particular, the nonwoven fabric 50 can be easily bent along the above-mentioned row of the plurality of junctions 52 arranged at intervals. Specifically, the joint portion 52 itself, which is a concave portion, tends to become harder than the surrounding area due to being compacted, so the thickness along the joint portion 52 does not cause bending difficulty, that is, along the thickness portion around the joint portion 52. The periphery of the concave portion is bent.

The pair of side leakage preventers 5 and 5 are respectively joined to the absorbent main body 10 so that the rows of convex parts 53 and joint parts 52 on the nonwoven fabric 50 are arranged alternately along the longitudinal direction of the sanitary napkin. In addition, on the side leakage preventing portion 5, the rows in which the convex portions 53 and the joint portions 52 are alternately arranged are formed in the width direction of the sanitary napkin and in the width direction or length relative to the sanitary napkin in addition to being formed in the length direction of the sanitary napkin. Multiple columns are also formed in the direction in which the direction is inclined.

The inner edge portion 51 on the side leakage preventing portion 5 is formed by folding back the nonwoven fabric 50 along the rows of the convex portions 53 and the joining portions 52 alternately arranged, so even if the nonwoven fabric 50 is bulky, it is easy to It folds back and is not prone to wrinkles due to the fold back.

In addition, when the sanitary napkin 1 is worn and bent along the wearer's skin, wrinkles are less likely to occur on the nonwoven fabric 50 for the same reason. Therefore, the side leakage preventing portion 5 is less likely to generate wrinkles extending in the width direction of the sanitary napkin, and is excellent in preventing liquid from leaking in this direction.

On the portion where the non-woven fabric 50 in the side leakage preventing portion 5 is folded in half, the opposite faces 50a, 50a' are shown in FIGS. The protrusions 53' are in contact.

Here, contact refers to a state in which the convex portion 53 and the convex portion 53' are in contact so that at least one of the convex portion 53 or the convex portion 53' is deformed, and the cross sections of the convex portions overlap in a plan view. The protrusions 53, 53' are filled with fibrous material and have elasticity against deformation. Therefore, the three-dimensional shape of the side leak-proof part 5 is formed by the contact state accompanied by deformation between the convex parts 53, 53', and the deformation of the side leak-proof part 5 from the outside has elastic restoring force and Has stability.

In addition, the cross-section of the convex portion refers to the cross-section of the convex portion with the imaginary plane P at the position that bisects the highest portion of the convex portion and the lowest portion of the concave portion in the thickness direction of the nonwoven fabric 50. Cutting plane (see Figure 4).

From the standpoint of stabilizing the three-dimensional shape of the side leakage preventing portion 5, the overlapping ratio of the cross-sections of the convex portions 53 is preferably 10-90%, particularly preferably 20-80%. Here, the overlapping ratio of the cross-sections of the convex portions is the ratio of overlapping the cross-sections of one of the two convex portions and the cross-section of the other convex portion among the two contacting convex portions. That is, if the cross section of one convex portion completely overlaps the cross section of the other convex portion, the overlapping ratio of the cross section of the convex portion is 100%. When convex portions having different cross-sectional areas are in contact with each other, the cross-section of the convex portion having a larger cross-sectional area is set as the cross-section of one convex portion.

Here, the convex portion is defined as follows.

The height H ₁ of the most raised portion between the concave portion formed by embossing and the concave portion adjacent to the concave portion was obtained by the same procedure and measurement method as the above-mentioned height T. At this time, when a plurality of measurements between the concave portions can be performed without passing through the top of the most convex convex portion 53 , the height H ₁ is set to the lowest convex among the measurement results. A portion protruding from the height _H1 is set as a convex portion.

Next, the cross-sectional area of the convex portion was measured as follows. The cross-sectional area of the convex portion 53 is the area when the convex portion 53 is assumed to be cut at the height _H1 .

First, use the above-mentioned microscope with any magnification of 20-100 times (choose the magnification of 5-10 according to the top) to take the respective planar photos of the inner surfaces 50a, 50a' of the relative non-woven fabric 50 and save the images ( print if necessary). Then, a line from the top of each convex portion to a concave portion adjacent to the convex portion (hereinafter referred to as a top-to-groove line) was recorded on the planar photograph.

Next, focusing on a certain convex portion 53, the cut surface is measured. The measurement of the cut plane must be carried out for all the concave parts adjacent to the above-mentioned convex parts. It is preferable that the number of the recessed part adjacent to the said convex part is 3 or more. Each measurement is carried out as follows: using the cut plane for which the above-mentioned height _H1 is obtained, a line ( _H1 line) indicating the height _H1 is recorded on the cut plane, and the distance from the position corresponding to the top on the _H1 line to the convex part is obtained. The length of the profile of the convex part is reflected on the planar photograph according to the average value of these lengths. The profile of the convex part is circular or elliptical, and the circular or elliptical shape is set as the cross-sectional area of the convex part.

Do the same for all the bumps in the flat photo.

The superimposition of the cross-section of the convex part is a planar photograph of the inner surface 50a of the nonwoven fabric 50 protruding inward in the width direction of the sanitary napkin on the side of the skin-contacting surface by reproducing the folded state of the inner edge part 51 and The cross-sectional area of the convex part recorded here, and the planar photograph of the inner surface 50a' in the folded non-skin-contacting nonwoven fabric 50 and the cross-sectional area of the convex part recorded here were measured. In order to reproduce the overlapped state, use a method of projecting the cross-sectional area of another convex portion that is transparent or translucent on a film on a planar photograph; a method of overlapping the cross-sectional area of the convex portion using the layer structure of software, etc., using image analysis Software (NEWQUBE ver.4.22 manufactured by NEXUS) measures the area of the overlapping portion. The overlapping ratio of the sections of the convex portion 53 was measured from the obtained area of the overlapping portion and the cross-sectional area of the convex portion in the planar photograph (the one with the larger cross-sectional area).

In addition, in the portion where the nonwoven fabric 50 is folded in half in the side leakage preventing portion 5, all the protrusions on the opposing surfaces do not need to be in contact with each other. The reason for this is that the overlap of the protrusions generated near the inner side portion 51 makes it easier for the surface 50a and the surface 50a' to separate between the inner side portion 51 and the joint portion 9, so that the protrusions are not in contact with each other. Such a floating state is more preferable from the viewpoint of improving the cushioning feeling.

Next, the sanitary napkin 1 of this embodiment will be further described. A pair of wings 6, 6 are formed integrally with the side leak-proof part 5 on the same side in the longitudinal direction of the sanitary napkin respectively by a piece of non-woven fabric 50, and are formed from the center of the outer edge part in the longitudinal direction of the side leak-proof part 5. The area sticks out to the outside.

One sheet of nonwoven fabric 50 is divided into a side leakage preventing portion 5 and a wing portion 6 with a seal portion 8 as a boundary. The pair of wings 6, 6 are each formed of uneven nonwoven fabric 50, and are easily bent along the edge of the panty crotch.

In addition, an adhesive layer for fixing the wing 6 bent along the edge of the crotch of the underwear to the outer surface of the underwear is provided on one surface of the nonwoven fabric 50 constituting a pair of wings 6 and 6 respectively. (not shown).

As shown in FIG. 1 , grooves 7 are provided on the side of the skin-contacting surface of the absorbent main body 10 in the sanitary napkin 1 . The grooves 7 are formed of a pair of embossed grooves extending in the longitudinal direction and two arc-shaped embossed grooves extending in the width direction at both ends of the embossed grooves in the longitudinal direction. In addition, a pair of the above-mentioned embossed grooves extending in the lengthwise direction each have a shape narrowed inward. Through the groove 7, the top sheet 2 and the absorber 4 are joined.

As shown in FIG. 2 , the inner edge portion 51 of the side leakage preventing portion 5 is located just outside the groove 7 .

Next, materials forming the sanitary napkin 1 of this embodiment will be described. As the nonwoven fabric forming the side leakage preventing portion 5, various nonwoven fabrics conventionally used in absorbent articles such as sanitary napkins can be used without particular limitation, and a waterproof nonwoven fabric is preferably used. For example, spun-bonded non-woven fabrics, spun-bonded non-woven fabrics (S) and melt-blown non-woven fabrics (M) composite sheets (such as SM, SMS, SMMS, etc.), carding or Water-repellent (hydrophobic) non-woven fabrics such as heated roll non-woven fabrics and air-through non-woven fabrics formed by air-laid methods. From the viewpoint of improving the cushioning feeling by increasing the bulkiness, it is also preferable to use multiple types of nonwoven fabrics by overlapping them, such as making a composite sheet of a spunbonded nonwoven fabric or an SMS sheet and an air-through nonwoven fabric, In this case, what is necessary is just to use a waterproof nonwoven fabric for the part which is the front side.

Moreover, various materials conventionally used for absorbent articles, such as a sanitary napkin, can be used as a forming material of the surface sheet 2, the back surface sheet 3, or the absorber 4, without particular limitation.

According to the above-mentioned sanitary napkin 1 of the present embodiment, the bulky non-woven fabric 50 having the unevenness is folded in half in such a way that the uneven surfaces face each other, thereby forming the side leak-proof portion 5, which has a simple structure and is easy to manufacture. , and its three-dimensional shape stability and wearing comfort are excellent. In addition, since the side leak-preventing portion 5 is in contact with the wearer's skin through the convex portion 53 , the skin feels good.

In addition, the side leakage preventing part 5 and the wing part 6 are formed of a single nonwoven fabric 50, and the manufacture becomes easy.

Next, a sanitary napkin according to a second embodiment of the present invention (first invention) will be described with reference to FIG. 5 . Where the second embodiment is not particularly described, the detailed description of the above-mentioned embodiment can be appropriately applied. In addition, in FIG. 5 , the same components as those in FIGS. 1-4 are denoted by the same reference numerals.

In the sanitary napkin 1 according to the preferred second embodiment of the present invention, each of the pair of side leakage preventers 5, 5 has stretchability in the longitudinal direction and the width direction of the sanitary napkin. The pair of side leakage preventers 5 and 5 are respectively joined to both sides in the longitudinal direction of the skin-contacting surface side of the absorbent body 10 in a state of being stretched in the longitudinal direction.

The sanitary napkin 1 in a natural state is bent toward the side of the skin-contacting surface of the sanitary napkin 1 in the longitudinal direction of the sanitary napkin 1 due to the contraction force of the pair of side leakage preventing portions 5 , 5 . The natural state refers to a state in which external forces other than gravity do not substantially act on the sanitary napkin 1 .

In the sanitary napkin 1 of the present embodiment, the nonwoven fabric 50 integrally formed with the side leakage preventing portion 5 and the wing portion 6 has stretchability. Here, the so-called stretchability in this specification refers to the property that the nonwoven fabric shrinks and returns to its original state when it is stretched under the pulling force of the hand. For stretchability, it is preferable to have When stretched lightly by hand, it returns to its original elastic state after the tension disappears.

The side leakage preventing portion 5 formed of the nonwoven fabric 50 can be elastically expanded and contracted in all directions of 360° in the plane of the nonwoven fabric 50 including both the longitudinal direction and the width direction of the sanitary napkin 1 .

About other structures, it is the same as the above-mentioned embodiment.

Next, the nonwoven fabric 50 of the present embodiment will be further described.

As shown in Fig. 5(a) and Fig. 5(b), the nonwoven fabric 50 consists of a first layer 54 arranged on one face, a second layer 55 arranged on the other face, and a layer between the two layers. After the third layer 56 is laminated, it is partially bonded by the bonding portion 52 having a predetermined pattern. The joining parts 52 in the nonwoven fabric 50 are arranged in a so-called zigzag pattern, and each joining part 52 is formed discontinuously in a circular shape in plan view. The junction part 52 is compacted, and compared with other parts in the nonwoven fabric 50, thickness becomes small and density becomes high, and a recessed part is formed.

In the first layer 54 , portions other than the bonding portion 52 are formed in a convex shape. That is, in plan view, the nonwoven fabric 50 has a convex shape (semispherical shape) at the part between the joining parts 52 of the first layer 54 (specifically, a substantially rectangular part having the joining parts 52 at the four corners). Therefore, a large number of convex portions 53a are formed. The interior of each convex portion 53a is filled with fibers constituting the first layer 54, and the interface between the first layer 54 and the third layer 56 between the joint portions is not bonded, but is in a state of close contact over the entire area. .

The second layer 55 has the same structure as the first layer 54 except that a large number of protrusions 53 b are formed toward the side opposite to the protrusions 53 a in the first layer 54 .

Next, the constituent fibers forming the first layer 54, the second layer 55, and the third layer 56 of the nonwoven fabric 50 will be described in detail. First, as fibers constituting the first layer 54 and the second layer 55, fibers composed of a thermoplastic polymer material are preferably used. Examples of thermoplastic polymer materials include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, and polyamides. In addition, a core-sheath type composite fiber or a side-by-side type composite fiber composed of a combination of the aforementioned thermoplastic polymer materials may also be used.

In addition, as the fibers constituting the first layer 54 and the second layer 55 , fibers that do not substantially have heat shrinkability or do not heat shrink below the heat shrink temperature of the fibers constituting the third layer 56 described later are used.

As fibers constituting the third layer 56, heat-shrinkable fibers mainly composed of thermoplastic polymer materials are preferably used. Also, as the fiber, a fiber exhibiting elastomeric behavior is used. Examples of such fibers include latently crimped fibers. The latently crimped fiber is a fiber that can be treated in the same way as conventional nonwoven fabric fibers before being heated, and exhibits a helical crimp by heating at a predetermined temperature, thereby having shrinkage properties. By using latently crimpable fibers, both heat shrinkable and elastomeric behavior can be exhibited simultaneously.

The latently crimped fiber is composed of, for example, an eccentric core-sheath type composite fiber or a side-by-side type composite fiber composed of two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include fibers described in JP-A-9-296325 and JP-A-2759331.

From the viewpoint of easiness of fiber production and good tactility as a component of an absorbent article, the fineness of the above-mentioned fibers constituting each fiber layer of the nonwoven fabric 50 is preferably 1.0 to 10 dtex, particularly preferably 1.0 to 10 dtex. 1.8-4.0dtex.

As the form of the aggregate of fibers constituting the first layer 54, for example, a fiber web formed by a carding method, a fiber web formed by an air-laid method, and fibers (adhesive fibers) that themselves have fusion bonding properties can be mentioned. A non-woven fabric with few fusion bonding points formed by mixing with non-melt-bondable fibers (fibers with a high melting point) after defibration, and a non-woven fabric with overlapping aggregates of the above-mentioned fiber webs. When the first layer 54 is in the form of a fiber web formed by a carding method, the nonwoven fabric is bulky and has convex portions filled with fibers constituting the fiber web, and the fibers are oriented along the convex portions. In particular, if the first layer 54 is composed of a fiber web formed by a carding method, the first layer 54 will have a very sparse structure, allowing penetration and retention of high-viscosity liquids. Furthermore, the compression deformability of the first layer 54 when compressed in the thickness direction is also improved. Examples of high-viscosity liquids include loose stools or menstrual blood, cleansers or moisturizers for the human body, or cleansers for objects.

The fiber web formed by the carding method or the air-laying method refers to a fiber assembly in a state before being nonwoven. That is, the fibrous web formed by the carding method or the air-laid method is not yet in a state of being processed after the fiber reticulation process used in the manufacture of nonwoven fabrics, for example, the hot air method and the hot roll ( Embossing) heat fusion bonding treatment, which is a fiber aggregate in a state where fibers are extremely loosely entangled. When the fiber web formed by the carding method is used for the first layer 54, the fibers in the first layer 54 are thermally melt-bonded or bonded with a solvent while the first layer 54 is bonded to other fiber layers or after it is bonded. Bond or make it mechanically interweave.

What has been said above for the first layer 54 also applies to the second layer 55 .

As the form of the aggregate of fibers constituting the third layer 56, (1) a fiber web that contains latently crimped fibers and is formed by carding; or (2) as a heat-shrinkable nonwoven fabric, Non-woven fabrics formed by thermal fusion bonding, non-woven fabrics formed by water flow interweaving, non-woven fabrics formed by needle punching, non-woven fabrics formed by solvent bonding, and non-woven fabrics formed by spunbonding Non-woven fabric, non-woven fabric formed by melt blown method. Here, the heat-shrinkable nonwoven fabric refers to a nonwoven fabric that shrinks when heated at a predetermined temperature; (3) heat-shrinkable mesh can also be mentioned.

According to the sanitary napkin 1 of the present embodiment described above, since the pair of side leak-proof parts 5 and 5 have stretchability respectively, even when wearing the sanitary napkin 1 and bending it along the wearer's skin, the side leak-proof parts 5 will It is also less prone to wrinkles.

In addition, in the part where the nonwoven fabric 50 of the side leakproofing part 5 is folded in half, in the facing surfaces, although the convex part 53 on the one surface 50a is in contact with the convex part 53' on the other surface 50a', the convex part The cushioning performance of 53 and 53' is improved, and the stability of the three-dimensional shape of the side leakage preventing portion 5 and the wearing comfort are further improved.

In addition, the same effects as those of the above-mentioned embodiment can be obtained.

The present invention (first invention) is not limited to the above-described embodiments, and can be appropriately modified without departing from the gist of the present invention.

For example, in the sanitary napkin which is the absorbent article of the present invention, the side leakage preventing portion may be formed by overlapping two bulky nonwoven fabrics having irregularities so that the irregular surfaces face each other.

In addition, in each embodiment, on the non-woven fabric 50 forming the side leak-proof part 5, each independent convex part 53 is dispersedly arranged, but the non-woven fabric may also be provided in such a way that the non-woven fabric is dispersed and arranged on the bulky non-woven fabric. recessed part. That is, the nonwoven fabric may be provided so that the convex portion is substantially continuous, and the region of the convex portion is flat in appearance. In addition, the convex part 53 in a nonwoven fabric may be located in the inner surface of at least double-folding, and may be provided in the outer surface. In addition, in each embodiment, the top view shape of the joining portion 52 is circular, but other than circular, it may be oval, triangular, rectangular, or a combination thereof. Furthermore, the joining portion 52 may be formed in a continuous shape such as a linear shape such as a straight line or a curved line, a grid shape, or the like. In addition, the pair of side leakage preventers 5 and 5 preferably extend over the entire length of the absorptive main body 10, but may extend at least over the part facing the excretion part of the wearer.

Furthermore, in the sanitary napkin 1 as the absorbent article of the present invention (the first invention), as shown in FIG. The outer side of the width direction of the napkin extends to the inner side, and the inner side is folded back toward the skin contact surface side. After the inner edge portion 51 of the side leak-proof part is formed at the inner side of the folded end, it extends to the outer side of the width direction of the sanitary napkin, and at the end of the width direction of the sanitary napkin. The part is folded back toward the absorbent layer 11 side. In addition, as shown in FIG. 7, in the sanitary napkin 1, the pair of wing portions 6, 6 may be formed by different parts from the side leak-proof portion 5, and the side leak-proof portion 5 may be overlapped with the seal portion 8. The back sheet 3 is secured. In addition, the sanitary napkin 1 does not need to have a pair of wing parts.

The absorbent article of the present invention (first invention) may be a sanitary napkin, a panty liner, an incontinence pad, or the like.

The parts omitted from description in the above-mentioned one embodiment and the parts included in only one embodiment can be used mutually as appropriate.

Hereinafter, preferred embodiments of the absorbent article according to the second aspect of the present invention will be described with reference to the drawings.

The absorbent article 1 of this embodiment is a sanitary napkin, and as shown in FIGS. 8 and 9 , has a liquid-retentive absorbent layer 11 and a liquid-impermeable leak-proof layer 12 and is substantially elongated. The absorptive main body 10 of the present invention has a pair of side leak-proof parts 5 and 5 covering both sides in the longitudinal direction of the skin-contacting surface side of the absorptive main body 10 . The absorbent layer 11 in the sanitary napkin 1 is composed of a liquid-permeable top sheet 2 and a liquid-retentive absorbent body 4, and the leak-proof layer 12 is composed of a back sheet 3 having air permeability and liquid impermeability.

In addition, in the sanitary napkin 1 of the present embodiment, the pair of side leak-proof parts 5, 5 are respectively made of a side leak-proof part forming sheet 50 having a large number of embossed parts 52, 52... The inner side in the width direction of the absorbent main body 10 has a folded end portion 51, and the side leakage preventing portion forming sheet 50 is folded back to the outer side in the width direction of the absorbent main body 10, and the front end of the folded end portion 51 is not formed with an embossed portion 52.

Next, the sanitary napkin 1 (hereinafter also simply referred to as a sanitary napkin) of this embodiment will be described in more detail. The sanitary napkin 1 has a vertically long shape, and its longitudinal direction coincides with the longitudinal direction of the absorbent main body 10 (hereinafter also referred to as the main body longitudinal direction). The front sheet 2 and the back sheet 3 each have a vertically elongated shape, and their longitudinal direction coincides with the main body longitudinal direction. The absorber 4 has a vertically long shape, and its longitudinal direction coincides with the main body longitudinal direction, and is sandwiched and fixed between the top sheet 2 and the back sheet 3 . The width of the top sheet 2 is substantially the same as that of the absorber 4 , and is formed narrower than the width of the back sheet 3 . The topsheet 2 covers the entire surface area of the absorber 4 on the skin-contacting side. The front sheet 2 and the back sheet 3 protrude from both ends in the longitudinal direction of the absorber 4, and are joined to each other at the protruding portions by known joining methods such as heat sealing and bonding with an adhesive.

Next, the pair of side leakage preventers 5, 5 in the sanitary napkin 1 of this embodiment will be further described. As shown in FIG. 8 , the pair of side leakage preventers 5 , 5 are each formed in a vertically long shape whose longitudinal direction coincides with the main body longitudinal direction. The pair of side leakage preventers 5, 5 are respectively arranged between both ends in the longitudinal direction of the main body.

As shown in FIG. 9 , the pair of side leakage preventing portions 5 , 5 are joined to the back sheet 3 via the first seal portion 8 at the side edge portion of the absorptive main body 10 . In the pair of side leak-preventing parts 5, 5, the side leak-preventing part forming sheet 50 extends from the side edge part of the absorbent main body 10 to the inner side of the width direction of the absorbent main body (hereinafter also referred to simply as the main body width direction), and After being folded back toward the outer side in the main body width direction toward the absorbent layer 11 so as to form the inner side part as the folded back end part 51, it extends toward the outer side in the main body width direction. The front end portion of the folded back side leak preventing portion forming sheet 50 is joined to the front sheet 2 at the second seal portion 9 extending in the main body length direction. The second seal portion 9 is formed across the lengthwise direction of the main body between both end portions. Each of the first sealing portion 8 and the second sealing portion 9 can be formed by a known joining method such as heat sealing or bonding with an adhesive.

In the side leakage preventive portion 5 , it is preferable not to join the surface sheet 2 to the portion on the inner side in the main body width direction than the second seal portion 9 . In addition, at both ends in the longitudinal direction of the main body, the part between the inner side part 51 and the second seal part 9 in the folded side leakproof part forming sheet 50 is preferably spread over substantially the entire surface or at the inner side part 51. The vicinity is joined to the top sheet 2 (not shown).

Next, the side leak preventing portion forming sheet 50 will be further described.

As shown in Fig. 9 and Fig. 10(a), the side leak-proof portion forming sheet 50 is laminated by five non-woven fabrics, and its two sides are bonded and integrated by a large number of embossed portions 52, 52... in accordance with a prescribed pattern. And formed, the non-embossed part protrudes outward by forming the embossed parts 52, 52..., and forms many convex parts 53, 53....

The outer surface of the side leakage preventing portion 5 is formed of one outermost nonwoven fabric 54a, and the inner surface of the side leakage preventing portion 5 is formed of the other outermost nonwoven fabric 54b.

At least one of the three-layer non-woven fabrics 55a, 55b, 55c of the inner layer between the two outermost non-woven fabrics 54a, 54b is preferably positioned in the width direction of the absorbent main body (hereinafter also referred to as the main body width direction). ) is flexible. In this embodiment, the inner layer nonwoven fabric 55b positioned at the center of the laminated nonwoven fabric has stretchability.

In this embodiment, the two outermost non-woven fabrics 54a, 54b and the inner layer non-woven fabrics 55a, 55c adjacent to the two non-woven fabrics 54a, 54b move outward due to the shrinkage of the inner layer non-woven fabric 55b. uplift.

In the side leak-proof portion forming sheet 50, as shown in FIG. 8 , the embossed portions 52 are arranged in a so-called zigzag pattern, and each embossed portion 52 is formed discontinuously in an oval shape in plan view, along the length of the sanitary napkin 1. Orientation is lengthwise. That is, the major axis direction of the ellipse substantially coincides with the longitudinal direction of the sanitary napkin 1 . The embossed portion 52 is compacted, and has a smaller thickness and a higher density than other portions in the side leakage preventing portion forming sheet 50 .

In the nonwoven fabrics 54a and 54b of both outermost layers, the non-embossed parts other than the embossed part 52 are formed in a convex shape. That is, when the side leakage preventing portion forming sheet 50 is viewed in plan, the non-embossed portions between the embossed portions 52 of the non-woven fabrics 54a, 54b of the two outermost layers (in detail, the four corners have embossed portions) The substantially rectangular portion of the portion 52) is formed into a convex shape (semi-spherical shape), thereby forming a large number of convex portions 53, 53 . . . In addition, in the present embodiment, portions other than the embossed portion 52 in the inner layers 55a, 55c adjacent to the nonwoven fabrics 54a, 54b of both outermost layers are also formed in a convex shape.

Inside each convex portion 53, the respective interfaces of the outermost nonwoven fabrics 54a, 54b and the inner layer nonwoven fabrics 55a, 55b, 55c are not joined, but are at least partially separated.

From the standpoint of improving the three-dimensionality of the side leak-preventing portion 5 to improve leak-proofness and simultaneously obtaining a good wearing comfort of the side leak-preventing portion 5, the height T( Referring to Fig. 10(a)), it is preferably 0.1-1 mm, particularly preferably 0.2-0.5 mm. In addition, the height T of the convex portion 53 on the inner surface side and the height T ₁ of the convex portion 53 on the outer surface side with the embossed portion 52 as a boundary are preferably T from the viewpoint of obtaining a cushioning feeling and a smooth touch of the surface. Higher or equal to _T1 .

Here, the height T of the convex part 53 is measured as follows, for example. First, a test piece having a vertical and horizontal length of 10 mm×10 mm or more was cut out from the side leak preventing portion forming sheet 50 . Then, a line passing through the embossed portion 52 and the convex portion 53 is used as a cutting plane. An enlarged photograph of this section was obtained with a microscope (manufactured by KEYENCE Corporation, VH-8000). The height T from the top of the convex part 53 to the bottom (upper surface of the adjacent embossed part 52) was measured according to the scale of an enlarged photograph (refer FIG.10(a)). The height T is preferably measured at a portion of the side leakage preventing portion forming sheet 50 (one inner surface 50a of the side leakage preventing portion 5 ) protruding from the side of the absorbent main body 10 inwardly in the main body width direction. The part of the folded side leakage preventing portion forming sheet 50 (the other inner surface 50b of the side leakage preventing portion 5 ) may also be bonded to the front sheet 2 and is not suitable for height measurement. In addition, it is preferable to use the KES-G5HANDY-TYPE COMPRESSION TESTER (KATO TECH Co., Ltd.) of the KES measuring system before measuring the cross section to measure the thickness T ₀ (thickness under a load of 0.5 g/cm ² ) in advance, and confirm the thickness T _Z (see Figure 10(a)) is 90-110% of the thickness _T0 , if it is less than 90% or more than 140%, change the measurement site, if it is 110-130%, sandwich the sample between two plates to adjust the thickness After that, measure the height T by zooming in on the photo.

In the side leakage preventing portion forming sheet 50, the major axis of the embossed portion 52 is from the viewpoint of forming a large number of convex portions 53 with appropriate height and cushioning properties, and at the same time, the side leakage preventing portion 5 is easy to bend or bend. The length ratio to the minor axis is preferably 1:1-3:1, particularly preferably 3:2-2:1.

In addition, for the same reason, the distance between the closest embossed parts 52 (interval between centers) is preferably 1-5 mm in the main body length direction, particularly preferably 2-3 mm, and preferably 2-3 mm in the main body width direction. 1-10 mm, particularly preferably 2-8 mm. In addition, depending on the embossing arrangement, the distance between the centers may not be the longitudinal direction and the width direction, so the main body longitudinal direction and the main body width direction may be hypothetically set to connect the longitudinal direction line and the width direction line between embossings. , is obtained from the distance between the imaginary line and the center of the nearest embossed part 52 .

The convex portion 53 having the above-mentioned structure has a restoring force against a compressive force that crushes the convex portion, so that the three-dimensional shape can be maintained even when the sanitary napkin is worn.

The side leakage preventing portion 5 is formed by folding the side leakage preventing portion forming sheet 50 having the above-mentioned large number of convex portions 53, 53..., so it has cushioning properties and is excellent in wearing comfort.

As shown in FIG. 11 , on the side leakage preventing portion forming sheet 50 in the unfolded state, there are provided multilayer nonwoven fabrics 54a, 54b that have a predetermined width in the main body width direction along the main body length direction and form the sheet 50. , 55a, 55b, 55c are not joined non-embossed regions Q.

The side leakage preventing portion 5 is formed by folding the side leakage preventing portion forming sheet 50 along an imaginary line L that roughly bisects the non-embossed area Q in the width direction of the main body, and the folded end forms the inner surface of the side leakage preventing portion 5 . Side portion 51 .

Specifically, from the standpoint of forming the cushioning feeling of the inner edge portion 51 and the three-dimensional height of the side leakage preventing portion 5, the width of the non-embossed region Q in the main body width direction is preferably 1-15 mm, particularly preferably 2-15 mm. 10mm. Moreover, it is preferable to form longer than the distance of the width direction between the embossed parts 52 mentioned above from a viewpoint of easy folding.

In addition, in the side leakage preventing portion forming sheet 50 in the unfolded state, as shown in FIG. 11 , a large number of embossed portions 52 , 52 . Similarly, the convex parts 53, 53... of a non-embossed part are also preferably formed so that it may be line-symmetrical with respect to the imaginary line L, respectively. The embossed portions 52 , 52 . . . are preferably formed so that at least the non-embossed portion convex portions 53 are partially in contact with each other when the side leakage preventing portion forming sheet 50 is folded back along the imaginary line L.

Therefore, since the side leakage preventing portion 5 is formed by folding back the side leakage preventing portion forming sheet 50 on the imaginary line L, on the opposite inner surfaces 50a, 50b of the folded side leakage preventing portion forming sheet 50, as shown in FIG. As shown in FIG. 9 and FIG. 10( a ), the protrusions 53 of the non-embossed portion are in contact with each other. FIG. 10( a ) is a partially enlarged view of a circled mark A in FIG. 9 .

Here, the so-called contact refers to the following state: contact with at least any one of the convex portion 53 on one inner surface 50a of the side leakage preventing portion 5 or the convex portion 53 on the other inner surface 50b accompanied by deformation, In addition, the cross-sections of the convex portions overlap each other when viewed from above. The convex portion 53 is formed by laminating multiple layers of nonwoven fabrics, and has elasticity against deformation. Therefore, the three-dimensional shape of the side leak-proof part 5 is formed by the contact state accompanied by deformation between the convex parts 53, and the deformation of the side leak-proof part 5 from the outside has a restoring force generated by elasticity, thereby having a three-dimensional shape. shape stability.

From the viewpoint of stabilizing the three-dimensional shape of the side leakage preventing portion 5 , the overlapping ratio of the cross-sections of the convex portions 53 is preferably 10-90%, particularly preferably 20-80%. Here, the overlapping ratio of the cross-sections of the convex portions 53 refers to the ratio of overlapping cross-sections of one of the two convex portions 53 that are in contact with the cross-sections of the other convex portion 53 . That is, if the cross section of one convex portion 53 completely overlaps the cross section of the other convex portion 53 , the overlapping ratio of the cross sections of the convex portion 53 is 100%. When the cross-sectional area of one convex portion 53 is different from that of the other convex portion 53 , the convex portion 53 having a larger area in the cross-section is set as one convex portion.

The measurement of the cross-sectional area of the convex portion 53 is performed as follows.

First, the convex portion here is defined as follows.

The height H ₁ (not shown) of the most elevated portion between the embossed portion and the embossed portion adjacent to the embossed portion is obtained by the same procedure and measuring method as the above-mentioned height T. At this time, when a plurality of measurements can be performed between embossed portions without passing through the top of the most raised convex portion 53 , the lowest raised among the measurement results is set as height H ₁ . A portion protruding from the height _H1 is set as a convex portion.

Next, the cross-sectional area of the convex portion was measured as follows. The cross-sectional area of the convex portion 53 is the area when the convex portion 53 is assumed to be cut at the height _H1 .

First, use the above-mentioned microscope at an arbitrary magnification of 20-100 times (select the magnification of 5-10 pieces from the top) to take planar photos of the inner surfaces 50a, 50b of the opposite side leakage preventing portion forming sheet 50 and map them. Like saving (printing if necessary). Then, the line from the top of each convex part to the embossed part adjacent to the said convex part (it is hereafter set to a top-embossed part line) was recorded on the planar photograph.

Next, focusing on a certain convex portion 53, the cut surface is measured. The measurement of the cut plane must be carried out for all embossed parts adjacent to the above-mentioned convex parts. It is preferable that the number of the embossed part adjacent to the said convex part is 3 or more. Each measurement is carried out as follows: using the cut plane for which the above-mentioned height _H1 is obtained, a line ( _H1 line) indicating the height _H1 is recorded on the cut plane, and the distance from the position corresponding to the top on the _H1 line to the convex part is obtained. The length of the profile of the convex part is reflected on the planar photograph according to the average value of these lengths. The profile of the convex part is circular or elliptical, and the circular or elliptical shape is set as the cross-sectional area of the convex part.

Do the same for all the bumps in the flat photo.

The overlap of the cross-sections of the convex parts is the plane of the inner surface 50a of the side leak-proof part forming sheet 50 on the side of the skin contacting surface protruding inwardly in the main body width direction by reproducing the folded state of the inner side part 51. The photo and the cross-sectional area of the convex portion recorded here, and the planar photo of the inner surface 50b of the side leakage preventing portion forming sheet 50 on the non-skin-contacting side of the folded back and the cross-sectional area of the convex portion recorded here were measured. . In order to reproduce the overlapped state, use a method of projecting the cross-sectional area of another convex portion that is transparent or translucent on a film on a planar photograph; a method of overlapping the cross-sectional area of the convex portion using the layer structure of software, etc., using image analysis Software (for example, NEW QUBE ver. 4.22 manufactured by NEXUS) measures the area of the overlapping portion. The overlapping ratio of the sections of the convex portion 53 was measured from the obtained area of the overlapping portion and the cross-sectional area of the convex portion in the planar photograph (the one with the larger cross-sectional area).

In addition, between the inner edge portion 51 and the second sealing portion 9, all the protrusions 53 on the opposing inner surfaces 50a, 50b of the side leak preventing portion 5 do not need to be in contact with each other. One inner surface 50 a and the other inner surface 50 b are easily separated by overlapping between the convex portions 53 near the inner side edge portion 51 , so that a non-contact portion between the convex portions 53 can be formed. Forming such a divided portion is preferable from the viewpoint of improving the cushioning feeling of the side leakage preventing portion 5 .

Next, the inner edge portion 51 of the side leakage preventing portion 5 will be further described.

The inner edge portion 51 of the side leak preventing portion 5 is formed by folding the side leak preventing portion forming sheet 50 in the non-embossed region Q described above. The inner edge portion 51 forms a free end portion on the inner side in the main body width direction of the side leakage preventing portion 5 and extends linearly in the main body length direction.

From the viewpoint of forming a three-dimensional barrier, it is preferable that the inner edge portion 51 is separated from the surface sheet 2 . In addition, for the inner edge portion 51, since the surface sheet 2 is trapped around the groove 7 by forming the groove 7 described later, the three-dimensionality of the side leakage preventing portion 5 relative to the surface sheet 2 is increased, which can effectively prevent leakage. The bodily fluid flowing over the top sheet 2 moves from the inside toward the outside in the main body width direction.

The outer surface of the inner side portion 51 is made of a nonwoven fabric that is continuously connected to the outermost nonwoven fabric 54a on the skin contacting side of the sanitary napkin 1 and the skin contacting side of the side leakage preventing portion 5 .

The embossed portion 52 is not formed on the front end of the folded-back end portion of the side leak preventing portion forming sheet 50 , that is, on the outer surface of the inner side portion 51 . That is, the outer surface of the inner side part 51 is formed only by the convex part 53 which is not an embossing part.

The nonwoven fabric 54a forming one outermost layer at the front end of the inner side portion 51 has a convex shape curved inward in the main body width direction as shown in FIG. 10( b ). Similarly, the inner layer nonwoven fabric 55a adjacent to the outermost nonwoven fabric 54a also has a slightly convex shape curved inward in the main body width direction. FIG. 10( b ) is a partial enlarged view of the circled mark B in FIG. 9 .

In this way, the front end of the inner side portion 51 is smooth, has cushioning properties, and is comfortable to wear.

In addition, the inner surface of the inner side edge portion 51 is formed of a nonwoven fabric continuously connected to the nonwoven fabric 54b forming the opposite inner surfaces 50a, 50b of the side leakage preventing portion 5, respectively.

Another outermost nonwoven fabric 54b forming the inner surface of the inner side portion 51 protrudes outward in the main body width direction as shown in FIG. 10( b ). Similarly, the inner layer nonwoven fabric 55c adjacent to the outermost nonwoven fabric 54b also has a shape that protrudes slightly toward the outside in the main body width direction.

In this way, as shown in Figure 10(b) on the inner surface of the folded-back end portion, that is, the inner side portion 51, the non-woven fabrics 54b, 55c on the inner surface side of the non-embossed portion protrude, so when the sanitary napkin is worn, Therefore, the inner edge portion 51 is not easily crushed, and the above-mentioned smooth shape of the front end of the inner edge portion 51 can be maintained.

As shown in FIG. 8 , a large number of rows in which convex portions 53 and embossed portions 52 are alternately arranged are formed on the above-mentioned side leakage preventing portion 5 . Although the side leakage preventing portion forming sheet 50 is formed by laminating multiple layers of nonwoven fabrics, it becomes easy to bend or bend by providing a large number of embossed portions 52 . The side leakage preventing portion forming sheet 50 can be bent easily, especially along the above-mentioned row where the plurality of embossed portions 52 are arranged at a distance. Specifically, the embossed portion 52 itself is harder to bend than the convex portion 53 because it is compacted, but the portion of the convex portion 53 near the embossed portion 52 has a relatively small thickness and is easy to bend. That is, the side leakage preventing portion forming sheet 50 is easily bent along the periphery of the embossed portion 52 .

In addition, when the sanitary napkin 1 is worn and bent along the wearer's skin, wrinkles are less likely to be formed on the side leakage preventing portion forming sheet 50 for the same reason. Therefore, the side leakage preventing portion 5 is less likely to have wrinkles extending in the width direction of the main body, and has excellent performance in preventing liquid from leaking in this direction.

The respective widths of the pair of side leak preventing portions 5 , 5 preferably have dimensions as described below from the viewpoint of obtaining good leak resistance and wearing comfort. In the portion where the pair of wing portions 6, 6 are provided in the longitudinal direction of the main body, on the center line of the wing portion 6 in the longitudinal direction, the first seal is measured along the surface of the side leakage preventing portion 5 in the width direction of the main body. The length between the portion 8 and the end edge on one side of the inner side portion 51 is preferably 10-30 mm, particularly preferably 15-25 mm.

In addition, the length of the folded portion of the side leakage preventing portion forming sheet 50 measured along the surface of the side leakage preventing portion 5 in the main body width direction is preferably 70-100% with respect to the above-mentioned width of the side leakage preventing portion 5, particularly preferably It is 85-95%, and for the same reason and from the viewpoint of easy formation of the first sealing portion 8, it is preferably at least 10 mm or more.

From the standpoint of improving the three-dimensionality of the side leak-preventing portion 5 to improve leak-proofness and simultaneously obtaining a good wearing comfort of the side leak-preventing portion 5, the mass per unit area of the side leak-preventing portion forming sheet 50 is preferably 20-100 g. /m ² , particularly preferably 25-50 g/m ² .

The measurement of the mass per unit area is measured as follows, for example. Cut the side leak-proof portion forming sheet 50 into a size of 10 mm x 10 mm or more, preferably 30 mm x 30 mm or more, cut a measurement piece with a total area of 250 mm ^{or more} from a sanitary napkin, and use a minimum display of 1 mg. The electronic balance measures the weight of the measurement piece, and converts it to obtain the mass per unit area. In order to improve the measurement accuracy of the mass per unit area, it is preferable to cut out measurement pieces from a plurality of sanitary napkins, and obtain the average value of the measured values at 5 or more points.

Next, the sanitary napkin 1 of this embodiment will be further described. As shown in FIG. 9 , there are a pair of wing portions 6 , 6 protruding from both sides in the longitudinal direction of the absorbent main body 10 . The drain forming sheet 50 is formed.

A pair of wing portions 6, 6 are integrally formed with the side leakage preventing portion 5 on the same side of the main body length direction respectively by a side leakage preventing portion forming sheet 50, and are formed from the sides of the side leakage preventing portion 5 in the longitudinal direction. The central region protrudes outward.

One side leakage preventing portion forming sheet 50 is divided into a side leakage preventing portion 5 and a wing portion 6 with the first seal portion 8 as a boundary. The pair of wing portions 6, 6 are each formed of the side leakage preventing portion forming sheet 50, and are easily bent along the edge portion of the panty crotch.

Adhesives for fixing the wing 6 bent along the edge of the crotch of the underwear to the outer surface of the underwear are provided on one surface of the side leakage preventing portion forming sheet 50 constituting a pair of wings 6, 6 respectively. layers (not shown).

As shown in FIG. 9 , the pair of side leakage preventing portions 5 , 5 are joined to the back sheet 3 at the first seal portions 8 on both sides in the longitudinal direction of the absorbent main body 10 . The shape of the first sealing portion 8 has a shape that is tightened toward the inside in the width direction of the main body at the central portion in the longitudinal direction, so that when the continuously disposed wing portion 6 is bent along the edge of the crotch portion of the underwear, the wing portion 6 is easily connected to the inner portion of the crotch of the underwear. The edge of the crotch of the panty is matched.

Furthermore, as shown in FIG. 8 , grooves 7 are provided on the side of the skin-contacting surface of the absorbent main body 10 in the sanitary napkin 1 . The groove 7 is formed of a pair of embossed grooves extending in the lengthwise direction of the main body and two arc-shaped embossed grooves extending in the width direction of the body at both ends of the embossed grooves in the longitudinal direction. In addition, a pair of the above-mentioned embossed grooves extending in the length direction of the main body respectively have a shape narrowed inward. Through the groove 7, the top sheet 2 and the absorber 4 are joined. As shown in FIG. 9 , the inner edge portion 51 of the side leakage preventing portion 5 is located just outside the groove 7 .

Next, materials forming the sanitary napkin 1 of this embodiment will be described.

First, the materials for forming the nonwoven fabrics 54a and 54b of both outermost layers and the inner layer nonwoven fabric forming the side leakage preventing portion forming sheet 50 will be described in detail.

As the nonwoven fabric that forms the outermost layer nonwoven fabric 54a on the outer surface of the side leakage preventing portion 5, it is preferable to use, for example, a hot-air nonwoven fabric obtained by hot-air treatment of a thermally fused bonded fiber web manufactured by a carding method, Various nonwoven fabrics such as spunbonded nonwoven fabrics, meltblown nonwoven fabrics, and spunlace nonwoven fabrics. As a method for bonding fibers in these nonwoven fabrics, a method in which the thickness of the bonded portion is not smaller than that of other portions and the density is higher than that of other portions is preferable from the viewpoint of obtaining a good wearing comfort. For example, bonding with an adhesive or bonding by thermal fusion bonding may be used. In addition, instead of bonding fibers, mechanical entanglement of fibers may be utilized as in spunlace nonwoven fabrics and the like. In order to achieve a smooth touch and softness to the three-dimensional sheet, as a nonwoven fabric, it is most preferable to use a thermally fused bonded fiber web obtained by a carding method for hot air treatment, and under the condition of not applying strong compression. Air-laid non-woven fabric obtained by non-woven fabric.

From the point of view of making the skin contacting surface side of the side leakproofing part 5 have a good wearing comfort, and the skin contacting surface side of the inner edge part 51 is smooth and has cushioning properties, the outer edge of the side leakproofing part 5 is formed. The mass per unit area of the nonwoven of the surface nonwoven 54a is preferably 5-30 g/m ² , particularly preferably 12-20 g/m ² .

As the non-woven fabric of the stretchable inner layer, non-woven fabrics obtained by the hot-air method, spunbond method, and melt-blown method are used alone or in combination, and non-melt-adhesive fibers can be mixed with heat-melt-adhesive fibers. A structure in which the number of fusion bonded points between fibers is reduced; a structure in which a folded structure is formed and the tops of the folds are partially joined; a structure composed of fibers in which bonded points are formed by a resin exhibiting elastic behavior, etc. .

In addition, as the stretchable inner layer nonwoven fabric, for example, the nonwoven fabric described in the specification of JP-A-2002-187228 is also preferably used.

In addition, conventionally known nonwoven fabrics can be used without particular limitation as the outermost layer nonwoven fabric 54b positioned on the inner surface of the side leakage preventing portion 5 and the inner layer nonwoven fabric not having stretchability. According to the specific purpose and use of the three-dimensional sheet, for example, hot-air non-woven fabrics, spun-bonded non-woven fabrics, and melt-blown non-woven fabrics obtained by hot-air treatment of thermally fused bonded fiber webs produced by carding can be selected and used. , Spunlace non-woven fabrics and acupuncture non-woven fabrics and other non-woven fabrics. The method of bonding fibers in these nonwoven fabrics is not particularly limited, and for example, bonding with an adhesive or bonding by thermal fusion bonding can be used. In addition, instead of bonding fibers, mechanical entanglement of fibers may be utilized as in spunlace nonwoven fabrics and the like. In order to achieve a smooth touch and softness to the three-dimensional sheet, as a nonwoven fabric, it is most preferable to use a thermally fused bonded fiber web obtained by a carding method for hot air treatment, and under the condition of not applying strong compression. Air-laid non-woven fabric obtained by non-woven fabric.

From the viewpoint of making the inner edge portion 51 less likely to be crushed and obtaining good wearing comfort, the weight per unit area of the nonwoven fabric is preferably 5-30 g/m ² , particularly preferably 10-20 g/m ² .

From the viewpoint of ensuring the strength of the side leakage preventing portion forming sheet 50, the preferred configuration of the side leakage preventing portion forming sheet 50 can include, for example, the following configuration: using an air-through nonwoven fabric as an outermost nonwoven fabric 54a, using SMS (spunbond-meltblown-spunbond) nonwoven fabric as another nonwoven fabric 54b of the outermost layer, using the thermally crimpable fiber layer described in the description of JP-A-2002-187228 as a As the non-stretchable inner layer nonwoven fabric 55b, SMS nonwoven fabric is used as the inner layer nonwoven fabric 55a, 55c which does not have stretchability.

Moreover, various materials conventionally used for absorbent articles, such as a sanitary napkin, can be used as a forming material of the surface sheet 2, the back surface sheet 3, or the absorber 4, without particular limitation.

According to the sanitary napkin 1 of the present embodiment described above, the structure is simple, and it is excellent in wearing comfort and three-dimensional shape stability. In addition, since the side leak-preventing portion 5 contacts the wearer's skin through the convex portion 53 , it feels good on the skin.

In addition, the side leak prevention part 5 and the wing part 6 are formed with one side leak prevention part forming sheet 50, and manufacture becomes easy as demonstrated below.

Next, the manufacturing method of the absorbent article according to the second aspect of the present invention will be described with reference to the accompanying drawings based on the preferred embodiment of the manufacturing method of the above-mentioned sanitary napkin.

As a preferable 1st aspect which manufactures the sanitary napkin of this invention, the following method is mentioned, for example.

In the first embodiment of the manufacturing method of the sanitary napkin 1, in the manufacturing method of the side leakage preventing portion 5, at first, the inner layer is arranged with a stretchable non-woven fabric 55, and then three sheets of non-woven fabrics 54a, 54b, 55, then, the stretchable inner layer non-woven fabric 55 is stretched, and in the stretched state of the non-woven fabric 55, three non-woven fabrics 54a, 54a, 54b, 55 in the non-embossed area Q, and at the same time, the laminated three non-woven fabrics 54a, 54b, 55 are bonded and integrated through a large number of embossed parts 52, 52..., and then the stretching of the inner non-woven fabric 55 is released. In the long state, the side leakage preventing portion forming sheet 50 is manufactured, and then the side leakage preventing portion forming sheet 50 is folded back in the non-embossed region Q to manufacture the side leakage preventing portion 5 .

In addition, in the above-mentioned sanitary napkin 1 of the present embodiment, the side leak-proof portion forming sheet 50 is formed by laminating five non-woven fabrics, but in this embodiment, the side leak-proof portion forming sheet 50 consists of three sheets. The non-woven fabric is formed by laminating.

Next, the manufacturing method of the sanitary napkin 1 of this embodiment will be further described.

First, the absorbent main body 10 shown in Fig. 8 and Fig. 9 is manufactured according to a conventional method, which has a front sheet 2, a back sheet 3 and an absorbent body 4 interposed between the two sheets.

Next, in the manufacturing method of the side leakproofing part 5, first, one stretchable nonwoven fabric 55 in a vertically long rectangular shape and two nonwoven fabrics 54a and 54b of the same shape are prepared. Then, a stretchable nonwoven fabric 55 is disposed on the inner layer, and three nonwoven fabrics 54a, 54b, and 55 are laminated as shown in FIG. 12(a). The nonwoven fabric 55 is preferably arranged such that the direction in which it becomes stretchable coincides with the direction in which it is stretched, which will be described later. The three sheets of nonwoven fabrics 54a, 54b, and 55 have the same shape, and preferably have a size that can integrally form the side leakage preventing portion 5 and the wing portion 6 of the sanitary napkin 1 .

Then, as shown in FIG. 12( b ), the stretchable inner layer nonwoven fabric 55 is stretched from both sides in a direction perpendicular to its longitudinal direction to elongate it. Then, in the state where the nonwoven fabric 55 is stretched, along the direction (hereinafter also referred to as the direction D2) perpendicular to the stretching direction (hereinafter also referred to as the direction D1), as shown in FIG. The two ends of the longitudinal direction of the woven fabric 55 are provided with the non-embossed region Q that does not join the 3 nonwoven fabrics 54a, 54b, 55, and simultaneously the 3 nonwoven fabrics 54a, 54b, 55 that are laminated are as shown in Fig. 12(c ) as shown, a large number of embossed parts 52, 52... are bonded and integrated.

In the width direction of the laminated nonwoven fabric, the position where the non-embossed region Q is formed is preferably set in such a manner that the side leak-proof portion forming sheet in the unfolded state can be ensured on both sides of the non-embossed region Q. The width of 50 and the width of wing 6.

It is preferable that many embossing parts 52, 52... are arrange|positioned in zigzag form, for example as shown in FIG. Moreover, it is preferable that each embossed part 52 is formed in the vertically long shape in direction D1. In addition, it is preferable that a large number of embossed parts 52 are formed line-symmetrically with respect to the imaginary line L which bisects the non-embossed area|region Q substantially equally along direction D2. For embossing, heat sealing is preferably used, for example.

Then, the stretched state of the inner layer nonwoven fabric 55 is released, and as shown in FIG. Both the outermost nonwoven fabrics 54 a and 54 b bulge outward by the contraction of the stretched inner nonwoven fabric 55 , and each convex portion 53 is formed on both surfaces of the side leakage preventing portion forming sheet 50 . In the same way, another side leakage preventing portion forming sheet 50 is fabricated.

Next, one end edge in the width direction of each of the pair of side leak preventing portion forming sheets 50 produced as described above is joined to both side edges of the front sheet 2 of the absorbent main body 10 by heat sealing.

Then, the side leak-preventing portion forming sheet 50 is folded upward on the imaginary line L to the outside in the width direction of the absorbent main body 10 in such a manner that the surfaces 50a, 50b having a large number of convex portions 53, 53, . . . The convex portion 53 in the surface 50a is in contact with the convex portion 53 in the other inner surface 50b. The part on the other end edge side in the width direction of each of the pair of side leak preventing portion forming sheets 50 , 50 protrudes outward from both sides in the longitudinal direction of the absorbent main body 10 .

In addition, the pair of side leakage preventing portion forming sheets 50, 50 and the absorbent main body 10 in the folded state as described above are bonded along the side edge of the absorbent main body 10 by heat sealing, and at the same time, At both ends in the longitudinal direction, the pair of side leakage preventing portion forming sheets 50 and 50 and the top sheet 2 are bonded together with an adhesive.

In addition, the respective outer shapes of the absorbent main body 10 and the side leakage preventing portion forming sheet 50 are cut into predetermined contours, and the wing portions 6 are formed together with the side leakage preventing portion 5 to obtain the sanitary napkin 1 of the second invention of the present invention. .

In the present embodiment described above, the sanitary napkins 1 are manufactured one by one, but it is also preferable to manufacture the sanitary napkins continuously using the elongated side leakage preventing portion forming sheet and the elongated absorbent main body. As the elongated nonwoven fabric fabric forming the elongated side leakage preventing portion forming sheet, a nonwoven fabric stored in a curled state produced separately is preferably used. When the volume of the crimped nonwoven fabric is reduced, it is preferable to recover the volume of the crimped nonwoven fabric, and use the recovered volume of the nonwoven fabric to produce the side leakage preventing portion forming sheet.

As a method of recovering the volume of a curled nonwoven fabric using hot air, there is, for example, the method described in the specification of JP-A-2004-137655.

In addition, when the stretchable inner layer nonwoven fabric 55 is stretched by 20% in the stretchable direction (100mm stretched to 120mm state), the elongation recovery rate is preferably 3% or more, particularly preferably 5%. %above. The stretchability required for the nonwoven fabric 55 is not so high.

The said elongation recovery rate is measured by the following method, for example. The measurement was performed in the tension mode using Tensile Compression Tester TENSILON "RTA-100" manufactured by ORIENTEC Corporation. First, the nonwoven fabric 55 was cut into a size of 70 mm in the direction having stretchability and 50 mm in the direction perpendicular to the direction to obtain a measurement piece. Between the pneumatic chucks installed on the tension and compression tester, the direction between the pneumatic chucks is consistent with the stretchable direction of the non-woven fabric 55, according to the initial sample length (between the chucks) Set the test piece at a distance of 50 mm, and raise the chuck attached to the load cell (rated output: 5 kg) of the tension and compression tester at a rate of 100 mm/min to elongate the test piece. When the measuring piece is extended by 20% of the initial sample length, that is, when it is elongated by 10mm, the moving direction of the chuck is reversed, and the chuck is lowered at a speed of 100mm/min, returning to the original sample length. Location. According to the operation during this period, the relationship between the load detected by the load cell and the elongation of the measurement piece was recorded on a graph, and the elongation recovery rate (%) was obtained from the graph by the following formula.

Elongation recovery rate = recovery elongation / maximum elongation length (= 10mm) × 100

Here, the recovery elongation is defined as the distance that the chuck moves from the maximum elongation when the chuck is lowered from the maximum elongation (=10 mm) and the load is initially recorded as zero.

Next, a second embodiment will be described as a preferable manufacturing method of the sanitary napkin according to the second aspect of the present invention. Where the second embodiment is not particularly described, the detailed description of the first embodiment can be appropriately applied.

In the second embodiment of the manufacturing method of the sanitary napkin 1, in the manufacturing method of the side leakage preventing portion 5, first, the stretchable non-woven fabrics 54a, 54b are disposed on both outermost layers, and then three non-woven fabrics are laminated. 54a, 54b, 55. The stretchable nonwoven fabrics 54a and 54b are preferably arranged so that the stretchable direction coincides with the stretched direction described later. Then, stretch the nonwoven fabrics 54a, 54b of the two outermost layers respectively, and in the state of stretching the nonwoven fabrics 54a, 54b, arrange three sheets of nonwoven fabrics along the direction D2 perpendicular to the stretching direction D1. The non-embossed area Q of cloth 54a, 54b, 55 joint, at the same time, use a large amount of embossing parts 52, 52... to carry out joint integration of 3 sheets of non-woven fabrics 54a, 54b, 55 laminated, and then release the two outermost layers The nonwoven fabrics 54a, 54b are stretched to form the side leakage preventing portion forming sheet 50, and then the side leakage preventing portion forming sheet 50 is folded back in the non-embossed area Q to form the side leakage preventing portion 5.

Next, the manufacturing method of the sanitary napkin 1 of this embodiment will be further described.

In the manufacturing method of the side leakproofing part 5, first, two stretchable nonwoven fabrics 54a and 54b in the shape of a vertically long rectangle and one nonwoven fabric 55 of the same shape are prepared. Then, stretchable nonwoven fabrics 54a, 54b are arranged on both outermost layers, and three sheets of nonwoven fabrics 54a, 54b, 55 are laminated as shown in Fig. 13(a).

Then, as shown in FIG. 13( b ), stretchable nonwoven fabrics 54a and 54b of the two outermost layers are respectively stretched from both sides in a direction perpendicular to the longitudinal direction to elongate them to the same extent. Then, in the state where the nonwoven fabrics 54a, 54b are stretched, along the direction D2 perpendicular to the stretching direction D1, as shown in FIG. The non-embossed area Q that does not join 3 non-woven fabrics 54a, 54b, 55 is set, and at the same time, as shown in Fig. The flower parts 52, 52... are joined and integrated.

Then, release the elongated state of the nonwoven fabrics 54a, 54b of the two outermost layers, as shown in Figure 13 (d), make the vertically elongated side leak-proof portion forming sheet 50 with a large amount of convex portions 53, 53... . As the stretched outermost nonwoven fabrics 54a, 54b shrink, the inner nonwoven fabric 55 shrinks, and wrinkles 55a, 55b are formed on the nonwoven fabric 55 . Then, another side leakage preventing portion forming sheet 50 is produced in the same manner.

Then, similarly to the above-mentioned present embodiment, the wing portion 6 is produced simultaneously with the production of the side leakage preventing portion 5, thereby obtaining the sanitary napkin 1 of the second invention of the present invention.

As shown in FIG. 13( d ), the side leak-proof portion forming sheet 50 of the sanitary napkin 1 produced in this embodiment is laminated with three non-woven fabrics 54a, 54b, 55 and bonded by a large number of embossed portions 52, 52... integrated and formed.

The inner layer nonwoven fabric 55 of the convex part 53 of the non-embossed part has wrinkles 55a, 55b, and the nonwoven fabrics 54a, 54b adjacent to the nonwoven fabric 55 are extruded outward due to the wrinkles 55a, 55b, and the two outermost The layers of nonwoven fabrics 54a and 54b are raised outward, respectively, and convex portions 53 are formed on both surfaces of the side leakage preventing portion forming sheet 50 .

Details are given below. The inner nonwoven fabric 55 of the convex portion 53, for example, has wrinkles 55a, 55b as shown in FIG. The side of the adjacent outermost nonwoven fabric 54b protrudes. Since the nonwoven fabrics 54a and 54b of both outermost layers are stretchable, they tend to bulge outward.

This invention (2nd invention) is not limited to the above-mentioned embodiment or embodiment, Unless it deviates from the summary of this invention, it can change suitably.

For example, in the sanitary napkin which is the absorbent article of the present invention, the side leakage preventing portion forming sheet 50 of the present embodiment is formed of a plurality of nonwoven fabrics, but may be formed of a single nonwoven fabric. For example, in a bulky nonwoven fabric, a large number of embossed parts may be formed on one or both surfaces, and a large number of convex parts may be formed.

In addition, the side leakage preventing portion forming sheet 50 of the present embodiment is formed of five nonwoven fabrics, but it may also be formed by laminating five or more nonwoven fabrics and passing through a large number of embossed parts 52, 52... Formed by joining together. When the side leakage preventing portion forming sheet 50 is formed of two nonwoven fabrics, one nonwoven fabric bulges outward to form the protrusions 53 . In addition, in this embodiment, although the embossed part 52 is formed discontinuously, you may form continuously over the both ends of the longitudinal direction of the side leakage prevention part 5. In addition, in this embodiment, although the top view shape of the embossed part 52 is an oval shape, it may be circular, triangular, rectangular, or combinations thereof other than an oval shape. In addition, the embossed part 52 may be formed in a continuous shape, for example, a linear shape such as a straight line or a curved line, a grid shape, or the like. In addition, the pair of side leakage preventers 5, 5 is preferably formed over the entire length of the absorbent main body 10, but may be formed at least on a portion facing the wearer's excretion portion.

Furthermore, in the first embodiment, the side leakage preventing portion forming sheet 50 is formed of three nonwoven fabrics, but the side leakage preventing portion forming sheet 50 may be formed of two or more nonwoven fabrics. In addition, in the second embodiment, the side leakage preventing portion forming sheet 50 is formed of three nonwoven fabrics, but the side leakage preventing portion forming sheet 50 may be formed of three or more nonwoven fabrics.

In addition, the sanitary napkin 1 does not need to have a pair of wing part.

The absorbent article of the present invention (second invention) may be a sanitary napkin, but may also be a panty liner, an incontinence pad, or the like.

The parts omitted from description in the above-mentioned one embodiment and the parts included in only one embodiment can be used mutually as appropriate. In addition, in the above-mentioned one embodiment, the parts omitted from description and the parts included in only one embodiment can be used mutually as appropriate.

Next, according to preferred embodiments, the absorbent article of the third aspect of the present invention will be described with reference to the drawings.

As shown in Figures 14 and 15, the absorbent article 1 of this embodiment is a sanitary napkin, comprising a liquid-retentive absorbent layer 11 and a liquid-impermeable leak-proof layer 12, and is substantially elongated. The absorptive main body 10 of the present invention has a pair of side leak-proof parts 5 and 5 covering both sides in the longitudinal direction of the skin-contacting surface side of the absorptive main body 10 . The absorbent layer 11 in the sanitary napkin 1 is composed of a liquid-permeable top sheet 2 and a liquid-retentive absorbent body 4, and the leak-proof layer 12 is composed of a back sheet 3 having air permeability and liquid impermeability.

In addition, in the sanitary napkin 1 of the present embodiment, the pair of side leak-proof parts 5, 5 are respectively made of a side leak-proof part forming sheet 50 having a large number of embossed parts 52, 52... The inner side in the width direction of the absorbent main body 10 has a folded end portion 51, and the side leak-proof portion forming sheet 50 is folded back to the outer side in the width direction of the absorbent main body 10, and the embossed portions 52, 52... are respectively leak-proof to the folded side faces. The opposing inner surface 50a, 50b side of the part forming sheet 50 protrudes, and each front end 56 of the embossed part 52, 52... is formed in a planar shape, and this planar part is thinned.

Next, the sanitary napkin 1 (hereinafter also simply referred to as a sanitary napkin) of this embodiment will be described in more detail. The sanitary napkin 1 has a vertically long shape, and its longitudinal direction coincides with the longitudinal direction of the absorbent main body 10 (hereinafter also referred to as the main body longitudinal direction). The front sheet 2 and the back sheet 3 each have a vertically elongated shape, and their longitudinal direction coincides with the main body longitudinal direction. The absorber 4 has a vertically long shape, and its longitudinal direction coincides with the main body longitudinal direction, and is sandwiched and fixed between the top sheet 2 and the back sheet 3 . The width of the top sheet 2 is substantially the same as that of the absorber 4 , and is formed narrower than the width of the back sheet 3 . The topsheet 2 covers the entire surface area of the absorber 4 on the skin-contacting side. The top sheet 2 and the back sheet 3 protrude from both ends in the longitudinal direction of the absorber 4, and are joined at the protruding parts by known joining methods such as heat sealing and bonding with an adhesive.

Next, the pair of side leakage preventers 5, 5 in the sanitary napkin 1 of this embodiment will be further described. As shown in FIG. 14 , the pair of side leakage preventers 5 , 5 are each formed in a vertically elongated shape whose longitudinal direction coincides with the main body longitudinal direction. The pair of side leakage preventers 5, 5 are respectively arranged between both ends in the longitudinal direction of the main body.

As shown in FIG. 15 , the pair of side leakage preventing portions 5 , 5 are joined to the back sheet 3 via the first seal portion 8 at the side edge portion of the absorptive main body 10 . In the pair of side leak-preventing parts 5, 5, the side leak-preventing part forming sheet 50 extends from the side edge part of the absorbent main body 10 to the inner side of the width direction of the absorbent main body (hereinafter also referred to simply as the main body width direction), and After being folded back toward the outer side in the main body width direction toward the absorbent layer 11 so as to form the inner side part as the folded back end part 51, it extends toward the outer side in the main body width direction. The front end portion of the folded back side leak preventing portion forming sheet 50 is joined to the front sheet 2 at the second seal portion 9 extending in the main body length direction. The second seal portion 9 is formed across the lengthwise direction of the main body between both end portions. The first sealing part 8 and the second sealing part can be formed by known joining methods such as heat sealing and bonding with an adhesive.

Further, as shown in FIGS. 15 and 16 , on the opposite inner surfaces 50 a , 50 b of the folded-back side leak preventing portion forming sheet 50 , the front ends 56 of the embossed portions 52 are in contact with each other.

In the sanitary napkin 1 of the present embodiment, the side leakage preventing portion forming sheet 50 is formed of a nonwoven fabric.

In the side leakage preventive portion 5 , it is preferable not to join the surface sheet 2 at a portion on the inner side in the main body width direction than the second seal portion 9 from the viewpoint of easy formation of pockets. In addition, at both ends in the longitudinal direction of the main body, the part between the inner side part 51 and the second seal part 9 in the folded side leakproof part forming sheet 50 is preferably spread over substantially the entire surface or at the inner side part 51. The vicinity is joined to the surface sheet 2 (not shown).

Next, the side leak preventing portion forming sheet 50 will be further described.

The side leakage preventing portion forming sheet 50 is formed by providing a large number of embossed portions 52, 52... on a nonwoven fabric. The part where the embossed part 52 is not formed in the side leakage preventing part 50 is a non-embossed part of the nonwoven fabric.

As shown in FIG. 14 , in the side leakage preventing portion forming sheet 50 , embossed portions 52 are arranged in a so-called zigzag pattern, and each embossed portion 52 is formed discontinuously in a circular shape in plan view. In the embossed portion 52, the fibers of the nonwoven fabric are compacted to increase the density.

As shown in FIG.15 and FIG.16, the recessed part 52a is formed in the side leak prevention part forming sheet 50 by the embossing part 52. As shown in FIG. The concave portion 52a is formed of a nonwoven fabric protruding from the side of the outer surface 50c of the side leakage preventing portion 5 toward the sides of the inner surfaces 50a, 50b. The concave portion 52 a has an opening on the outer surface 50 c of the side leak preventing portion 5 . The respective recesses 52a preferably have the same size.

Here, the outer surface 50c of the side leakage preventing portion 5 is the surface on the skin contacting side of the side leakage preventing portion 5, and the inner surfaces 50a, 50b of the side leakage preventing portion 5 are opposite sides of the folded side leakage preventing portion forming sheet 50. face. Moreover, the outer surface 50c of the side leakage prevention part 5 is made to face the surface sheet 2 partly by folding back the side leakage prevention part forming sheet 50. As shown in FIG.

As the form of the concave portion 52a, for example, a cylindrical shape, a tapered shape in which the diameter of the concave portion 52a gradually increases from the outer surface 50c side to the inner surface 50a, 50b side can be mentioned, but from the stability of the three-dimensional shape of the concave portion 52a 15 and 16, the shape of the recess 52a is preferably an inverted tapered shape in which the diameter of the recess 52a gradually decreases from the outer surface 50c side to the inner surfaces 50a, 50b side. In the present embodiment, the concave portion 52a has an inverted conical shape. The front end 56 of the recessed part 52a is comprised by the bottom surface part 56a which forms the outer surface, and the wall part 57 provided continuously around this bottom surface part 56a. The outer surface of the bottom surface part 56a is a part of the inner surfaces 50a, 50b of the side leakage preventing part 5 .

The opening diameter of the outer surface 50c of the side leak preventer 5 in the recess 52a is preferably 1-5 mm, particularly preferably 1.5-3 mm, from the viewpoint of obtaining good cushioning and smooth touch of the side leak preventer 5 .

As shown in FIG. 17 , the bottom surface portion 56 a of the concave portion 52 a has a circular shape in plan view, is formed in a flat plate shape, and is thinned. From the standpoint of obtaining the stability of the three-dimensional shape of the side leakage preventing portion 5, the thinned portion of the bottom portion 56a is preferably 30-100%, particularly preferably 60-100%, of the area of the bottom portion 56a when viewed from above. In this embodiment, the entire bottom portion 56a is thinned.

In this specification, "thinning" means that among the constituent resins of the constituent fibers of the nonwoven fabric, at least the resin with the lowest melting point is softened (preferably melted and solidified), so that the constituent fibers are bonded into a film-like state, and the portion that is thinned It is preferable that the fiber shape substantially disappears. The thinned bottom portion 56a is thinner and denser than the non-thinned portion of the concave portion 52a, and has a smoother surface.

As shown in FIG. 18 , a non-embossed region Q having a predetermined width in the main body width direction is provided along the main body length direction on the side leak preventing portion forming sheet 50 in the unfolded state.

The side leakage preventing portion 5 is formed by folding the side leakage preventing portion forming sheet 50 along an imaginary line L bisecting the non-embossed area Q in the width direction of the main body, and the folded end forms the inner side portion of the side leakage preventing portion 5 51.

Specifically, from the viewpoint of improving the cushioning feeling of the inner edge portion 51 and the leak-proofness of the side leak-proof portion 5, the width of the non-embossed region Q in the main body width direction is preferably 1-15 mm, particularly preferably 2-15 mm. 10mm.

In addition, in the side leakage preventive portion forming sheet 50 in the unfolded state, as shown in FIG. The recesses 52a, 52a, .

Therefore, since the side leakage preventing portion 5 is formed by folding back the side leakage preventing portion forming sheet 50 according to the imaginary line L, on the opposite inner surfaces 50a, 50b of the folded side leakage preventing portion forming sheet 50, as shown in FIG. As shown in FIG. 16 , the bottom surfaces 56 a of the recesses 52 a are in contact with each other. FIG. 16 is an enlarged view of a circled portion in FIG. 15 . As shown in FIG. 16, the bottom surface part 56a of the recessed part 52a is thinned and formed into a flat plate shape.

The outer surface of the bottom parts 56a is planar, and since the bottom parts 56a are in surface-to-surface contact, there is a relatively large contact area between the bottom parts 56a.

The bottom surfaces 56a of the concave portion 52a are preferably substantially entirely overlapped, and in this case, the pair of inverted conical shapes have a shape in which bottom surfaces (bottom surfaces with small diameters) are in contact with each other. The side leakage preventing portion 5 having such a structure has a simple structure, is bulky and has cushioning properties, has excellent wearing comfort, and has good three-dimensional shape stability.

In addition, depending on the processing accuracy of the manufacturing process, when the side leak-proof portion forming sheet 50 is folded back to form the side leak-proof portion 5, the actual folded position may deviate from the imaginary line L, but for the side leak-proof portion of this embodiment, As far as the deviation of the actual folded position in the main body width direction is less than half the diameter of the bottom surface 56a from the imaginary line L, at least a state where the bottom surface 56a is in partial contact can be obtained.

The preferred diameter of the bottom surface portion 56a is usually in the following range from the viewpoint of obtaining a state of contact between the bottom surface portions 56a, although it also depends on the processing accuracy of the manufacturing process. The diameter of the bottom surface portion 56a of the concave portion 52a is preferably 0.5-4 mm, particularly preferably 1-3 mm.

In addition, from the viewpoint of obtaining the stability of the three-dimensional shape of the side leakage preventing portion 5, the ratio of the overlapping bottom portions 56a is preferably 10-90%, particularly preferably 20-80%, of the area of the bottom portion 56a when viewed from above. .

In addition, based on the same reason, the interval between the closest recesses 52a (for example, the interval between the centers) is preferably 1-5mm, particularly preferably 2-3mm, preferably 1-8mm in the main body width direction, and particularly preferably 2-5mm. In addition, depending on the arrangement of the embossed parts, the distance between the centers may not be the longitudinal direction and the width direction, so the main body longitudinal direction and the main body width direction may be hypothetically set as the longitudinal line connecting the embossed parts and The width direction line is calculated|required from the distance between this imaginary line and the center of the nearest embossed part 52.

When the sanitary napkin 1 is worn, the concave portion 52a formed in the side leakage preventing portion 5 may receive a compressive force that bends the concave portion 52a. The concave portion 52a is preferably not easily bent even when subjected to the above-mentioned compressive force, and the concave portion 52a can return to its original shape if it is bent. preferred.

As shown in FIG. 17 , in order to realize the above-mentioned preferable side leak preventing portion 5 , the wall portion 57 of the recess 52 a of the side leak preventing portion 5 is partially thinned.

The wall portion 57 has a thinned portion 57a and a non-thinned portion. Since the recessed part 52a has the part 57a in which the wall part 57 was thinned, it is hard to buckle with respect to a compressive force. In addition, since the concave portion 52a has a portion where the wall portion 57 is not thinned, even if the concave portion 52a is bent, it can return to its original shape due to the flexibility of the unthinned portion. For example, when the entire wall portion 57 is thinned, once the wall portion 57 is bent, it is difficult for the concave portion 52a to return to its original shape. Furthermore, since the concave portion 52a has a portion that is not thinned, the shape stability and flexibility of the side leakage preventing portion forming sheet 50 can be maintained, and good wearing comfort of the side leakage preventing portion 5 can be ensured.

In addition, an opening 57 b is formed in the wall 57 , and the periphery of the opening 57 b is thinned. Providing the opening 57b in the thinned portion 57a prevents the portion 57a from becoming too rigid, so even if the concave portion 52a is bent, it is easy to return to the shape of the concave portion 52a before bending.

Next, the wall portion 57 of the recessed portion 52a will be further described. As shown in FIG. 17 , since the wall portion 57 is thinned with a predetermined width over both ends in the depth direction of the recessed portion 52 a , the buckling resistance of the recessed portion 52 a is further improved.

From the viewpoint of preventing the buckling of the concave portion 52a and simultaneously obtaining good wearing comfort of the side leakage preventing portion 5, the predetermined width of the thinned portion 57a is preferably 20-90° with respect to the diameter of the bottom surface portion 56a of the concave portion 52a. %, particularly preferably 30-80%. In addition, from the standpoint of shape stability, flexibility, and resistance to bending, it is more preferable that the thinned portion 57a has a portion that is not formed into a thin film than the case where the entire thinned portion 57a is formed into a thin film. The non-thin-filmed portion is independently dispersed in the thinned portion 57a.

Moreover, as shown in FIG. 17, the wall part 57 is thinned in the main body longitudinal direction. The thinned portion 57a is formed along the main body longitudinal direction at a position facing the wall portion 57 with the bottom surface portion 56a interposed therebetween. In each concave portion 52a, since the direction of the thinned portion 57a is along the main body longitudinal direction, flexibility in the main body width direction of the side leakage preventing portion 5 can be ensured.

When the sanitary napkin 1 is subjected to the compressive force generated from the inside of the wearer's two thighs from left to right to the inside at the crotch of the wearer, thereby deforming and bending into a convex shape toward the user's skin, the side leak-proof part 5 will also It can deform softly and give the wearer of the sanitary napkin a good wearing comfort.

From the point of view of improving the three-dimensionality of the side leak-preventing portion 5 to improve leak-proofness and simultaneously obtaining a good wearing comfort of the side leak-preventing portion 5, the depth T of the concave portion 52a in the side leak-preventing portion 5 (see FIG. 16 ) Preferably it is 0.2-5 mm, particularly preferably 0.5-2 mm.

Here, the depth T of the concave portion 52a is measured as follows, for example. First, a test piece having a vertical and horizontal length of 10 mm×10 mm or more was cut out from the side leak preventing portion forming sheet 50 . Then, a cut plane is made using a line passing through the embossed portion 52 and the non-embossed portion. An enlarged photograph of this section was obtained with a microscope (manufactured by KEYENCE Corporation, VH-8000). The height T from the front-end|tip 56 of the embossed part 52 to the outer surface of a non-embossed part was measured according to the scale of an enlarged photograph (refer FIG. 16). The height T is preferably measured at the portion of the side leakage preventing portion forming sheet 50 protruding from the side of the absorbent main body 10 inwardly in the main body width direction (one inner surface 50 a side of the side leakage preventing portion 5 ). The part of the folded side leakage preventing portion forming sheet 50 (the other inner surface 50b side of the side leakage preventing portion 5 ) may also be joined to the front sheet 2 and is not suitable for height measurement. In addition, it is preferable to use the KES-G5HANDY-TYPE COMPRESSION TESTER (KATO TECH Co., Ltd.) of the KES measuring system before measuring the cross section to measure the thickness T ₀ (thickness under a load of 0.5 g/cm ² ) in advance, and confirm the thickness T _Z (see Figure 16) is 90-110% of the thickness _T0 , if it is less than 90% or more than 140%, change the measurement site, if it is 110-130%, then clamp the sample in two plates to adjust the thickness, and then pass Enlarge the photo to measure the height T.

The above-mentioned large number of recesses 52a, 52a... are formed on the side leak-proof part 5, and the recesses 52a are deformed by compressive force, so the side leak-proof part 5 can give a soft feeling to the wearer of the sanitary napkin. In addition, when the compressive force disappears, the concave portion 52a returns to its original shape, so the three-dimensional height of the side leak-proof portion 5 can be maintained, ensuring good leak-proof performance.

In addition, since the side leakage preventing part 5 has a large number of recesses 52a, 52a..., when body fluid adheres to the skin-contacting surface side of the side leak preventing part 5, the body fluid flows into the recess 52a, thereby preventing leakage on the side surface. Bodily fluid residue is less likely to occur on the side of the skin contacting surface of the drain portion 5 .

On the other hand, since the non-woven fabric of the non-embossed portion of the side leakage preventing portion 5 is not formed with an embossed portion and is not thinned, the texture is good. Since the outer surface of the side leakage preventing portion 5 that directly contacts the skin of the wearer of the sanitary napkin is formed of a non-embossed portion of the nonwoven fabric, it feels good on the skin.

Next, the inner edge portion 51 of the side leakage preventing portion 5 will be further described.

The inner edge portion 51 of the side leak preventing portion 5 is formed by folding the side leak preventing portion forming sheet 50 in the non-embossed region Q described above. The inner edge portion 51 forms a free end portion on the inner side in the main body width direction of the side leakage preventing portion 5 and extends linearly along the main body length direction.

From the viewpoint of forming a three-dimensional barrier, it is preferable that the inner side portion 51 is separated from the surface sheet 2 . In addition, for the inner edge portion 51, since the surface sheet 2 is trapped around the groove 7 by forming the groove 7 described later, the three-dimensionality of the side leakage preventing portion 5 relative to the surface sheet 2 is increased, which can effectively prevent leakage. The bodily fluid flowing over the top sheet 2 moves from the inside toward the outside in the main body width direction.

In addition, the embossed portion 52 is not formed on the inner side portion 51 . That is, the inner side portion 51 is formed only by a non-embossed portion, and the front end of the inner side portion 51 is smooth, has cushioning properties, and is comfortable to wear.

As shown in FIG. 14 , a large number of rows in which embossed portions 52 and non-embossed portions are alternately arranged are formed on the above-mentioned side leakage preventing portion 5 . The side leak prevention part forming sheet 50 becomes easy to bend or bend by providing a large number of embossed parts 52, 52.... The side leakage preventing portion forming sheet 50 can be bent easily, especially along the above-mentioned row where the plurality of embossed portions 52 are arranged at a distance. Specifically, since the embossed part 52 itself is harder than the non-embossed part because it is compacted, it is a part that is difficult to bend, but the part near the embossed part 52 in the non-embossed part is easy to bend. That is, the side leakage preventing portion forming sheet 50 is easily bent along the periphery of the embossed portion 52 .

In addition, when the sanitary napkin 1 is worn and bent along the wearer's skin, wrinkles are less likely to be formed on the side leakage preventing portion forming sheet 50 for the same reason. Therefore, the side leakage preventing portion 5 is less likely to have wrinkles extending in the width direction of the main body, and has excellent performance in preventing liquid from leaking in this direction.

The respective widths of the pair of side leak preventing portions 5 , 5 preferably have dimensions as described below from the viewpoint of obtaining good leak resistance and wearing comfort. In the portion where the pair of wing portions 6, 6 are provided in the longitudinal direction of the main body, on the center line of the wing portion 6 in the longitudinal direction, the first seal is measured along the surface of the side leakage preventing portion 5 in the width direction of the main body. The length between the portion 8 and the end edge on one side of the inner side portion 51 is preferably 10-30 mm, particularly preferably 15-25 mm.

In addition, the length of the folded portion of the side leakage preventing portion forming sheet 50 measured along the surface of the side leakage preventing portion 5 in the main body width direction is preferably 70-100% with respect to the above-mentioned width of the side leakage preventing portion 5, particularly preferably It is 85-95%, and for the same reason and from the viewpoint of easy formation of the first sealing portion 8, it is preferably at least 10 mm or more.

Next, the sanitary napkin 1 of this embodiment will be further described. As shown in FIG. 15, the sanitary napkin 1 has a pair of wings 6, 6 protruding from both sides in the longitudinal direction of the absorbent main body 10, and the pair of wings 6, 6 protrude from the absorbent main body 10 The side leakage preventing portion forming sheet 50 is formed.

A pair of wing portions 6, 6 are integrally formed with the side leakage preventing portion 5 on the same side of the main body length direction respectively by a side leakage preventing portion forming sheet 50, and are formed from the sides of the side leakage preventing portion 5 in the longitudinal direction. The central region protrudes outward.

One side leakage preventing portion forming sheet 50 is divided into a side leakage preventing portion 5 and a wing portion 6 with the first seal portion 8 as a boundary. The pair of wing portions 6, 6 are each formed of the side leakage preventing portion forming sheet 50, and are easily bent along the edge portion of the panty crotch.

Adhesives for fixing the wing 6 bent along the edge of the crotch of the underwear to the outer surface of the underwear are provided on one surface of the side leakage preventing portion forming sheet 50 constituting a pair of wings 6, 6 respectively. layers (not shown).

As shown in FIG. 15 , the pair of side leakage preventing portions 5 , 5 are joined to the back sheet 3 at the first seal portions 8 on both sides in the longitudinal direction of the absorbent main body 10 . The shape of the first sealing portion 8 has a shape that is tightened toward the inside in the width direction of the main body at the central portion in the longitudinal direction, so that when the continuously disposed wing portion 6 is bent along the edge of the crotch portion of the underwear, the wing portion 6 is easily connected to the inner portion of the crotch of the underwear. The edge of the crotch of the panty is matched.

In this way, in the sanitary napkin 1 of this embodiment, the side leakage preventing portion 5 and the wing portion 6 are formed of a single side leakage preventing portion forming sheet 50, and the manufacture becomes easy.

Furthermore, as shown in FIG. 14 , grooves 7 are provided on the side of the skin-contacting surface of the absorbent main body 10 in the sanitary napkin 1 . The grooves 7 are formed of a pair of embossed grooves extending in the lengthwise direction of the body and two arc-shaped embossed grooves extending in the width direction of the body at both ends of the embossed grooves in the longitudinal direction. In addition, a pair of the above-mentioned embossed grooves extending in the length direction of the main body respectively have a shape narrowed inward. Through the groove 7, the top sheet 2 and the absorber 4 are joined. As shown in FIG. 15 , the inner edge portion 51 of the side leakage preventing portion 5 is located just outside the groove 7 .

Next, materials forming the sanitary napkin 1 of this embodiment will be described.

A conventionally known nonwoven fabric can be used without any particular limitation as the nonwoven fabric forming the side leakage preventing portion forming sheet 50 . For example, air-through non-woven fabrics, spun-bonded non-woven fabrics, melt-blown non-woven fabrics, spunlace non-woven fabrics, and needle-punched non-woven fabrics obtained by hot-air treatment of thermally fused bonded fiber webs produced by carding can be used. Non-woven fabrics and other non-woven fabrics. The method of bonding fibers in these nonwoven fabrics is not particularly limited, and for example, bonding with an adhesive or bonding by thermal fusion bonding can be used. In addition, instead of bonding fibers, mechanical entanglement of fibers may be utilized as in spunlace nonwoven fabrics and the like. In order to remarkably realize the smooth touch and softness of the side leak-proof part 5, as the nonwoven fabric, it is most preferable to use a non-woven fabric that will be subjected to hot air treatment with a thermally fused bonded fiber web obtained by the carding method, and without applying strong compression. Air-laid non-woven fabric obtained by non-woven fabric under certain conditions.

From the standpoint of improving the three-dimensionality of the side leak-preventing portion 5 to improve leak-proofness and simultaneously obtaining a good wearing comfort of the side leak-preventing portion 5, the mass per unit area of the nonwoven fabric forming the side leak-preventing portion forming sheet 50 is Preferably it is 20-100 g/m ² , particularly preferably 25-50 g/m ² .

The measurement of the mass per unit area is measured as follows, for example. Cut the side leak-proof portion forming sheet 50 into a size of 10 mm x 10 mm or more, preferably 30 mm x 30 mm or more, cut a measurement piece with a total area of 250 mm ^{or more} from a sanitary napkin, and use a minimum display of 1 mg. The electronic balance measures the weight of the measurement piece, and converts it to obtain the mass per unit area. In order to improve the measurement accuracy of the mass per unit area, it is preferable to cut out measurement pieces from a plurality of sanitary napkins, and obtain the average value of the measured values at 5 or more points.

Moreover, various materials conventionally used for absorbent articles, such as a sanitary napkin, can be used as a forming material of the surface sheet 2, the back surface sheet 3, or the absorber 4, without particular limitation.

As shown in Fig. 19(a) and Fig. 19(b), the side leakage preventing portion forming sheet 50 of this embodiment can be formed by sandwiching a nonwoven fabric 50' as a gray cloth between the first die 100 and the second die. 102 and extruded for easy and efficient manufacture. Fig. 19(b) is an enlarged cross-sectional view showing the main part in Fig. 19(a) in a direction perpendicular to the conveyance direction of the nonwoven fabric 50'.

The first stamper 100 is composed of a metal roll having a large number of conical protrusions 101 arranged in a row along the conveying direction of the nonwoven fabric 50', and the rows are arranged in a plurality of rows. In each column, convex portions 101 are provided at intervals. When focusing on any one convex portion 101 in one column, in the left and right columns adjacent to the column, the convex portion 101 adjacent to the column is There is no convex portion in the position. The second stamper 102 is formed of a metal roll having recesses 103 into which the rows of protrusions 101 of the first stamper 100 are fitted.

In addition, the first stamper 100 and the second stamper 102, as shown in FIG. 19( b ), preliminarily make the gap between the front end surface of the convex portion 101 and the bottom surface of the concave portion 103 sufficiently small with respect to the thickness of the nonwoven fabric 50 ′. , And, the front end surface of the convex portion 101 and/or the bottom surface of the concave portion 103 are set in advance at least to the softening point or higher than the melting point of the resin having the lowest melting point among the resins constituting the fibers constituting the nonwoven fabric 50 ′. In addition, in the part 104 between the convex parts 101 of a plurality of rows, it is preferable to set the gap between the first stamper 100 and the second stamper 102 to be the gap of the nonwoven fabric 50' in advance from the viewpoint of feeling on the skin or the like. Thickness or more, so that it is not easy to change the non-woven fabric due to heat.

It is preferable to provide a region Q' (not shown) not having a plurality of rows of protrusions 101 with a predetermined width on the circumferential surface of the first stamper 100, and to make the first stamper 100 and the second stamper in this region Q' in advance. The gap between dies 102 is the same as for sections 104 .

As a result of pressing between the first die 100 and the second die 102, the nonwoven fabric 50' is deformed to form a recess 52a, and the bottom face part 56a of the recess 52a is thinned into a flat plate, and at the same time, the nonwoven fabric 50' is formed into a flat plate. On the wall part 57 of the nonwoven fabric 50', a thinned part 57a is formed along the conveying direction of the nonwoven fabric 50', and the side leakage preventing part forming sheet 50 of this embodiment having a large number of recessed parts 52a, 52a... is obtained. In addition, it is preferable that the nonwoven fabric 50' is not thinned or compacted in the portion 104 between the plurality of rows of convex parts 101 and the region Q'.

The reason why the thinned portion 57a is formed in the wall portion 57 of the concave portion 52a along the conveying direction of the nonwoven fabric 50' is as follows. First, in the conveying direction, the multi-row protrusions 101 of the stamper 100 are first in contact with the non-woven fabric having no concavo-convex structure. Therefore, it is easy to apply the amount of heat and pressure compared to other parts. Second, the protrusion 101 that is pulled out after fitting is easy to apply pressure to the rear portion in the transport direction. Third, the device is less likely to deviate in the width direction, and sometimes deviates in time in the transport direction. Due to the above factors, it is easy to apply heat and pressure in the conveyance direction, so it is estimated that thin film formation is easy.

In addition, in each concave portion 52a, an opening portion 57b is formed in the thinned portion 57a of the wall portion 57 for the following reason. As mentioned above, since the pressure is easily applied, the thickness of the resin tends to be thinner in the thinned part, the resin tends to gather in a molten state or a state close to it, and the nonwoven fabric 50' itself is not uniform, etc., due to these factors. The opening part 57b.

The present invention (third invention) is not limited to the above-described embodiment or embodiment, and can be appropriately changed unless departing from the gist of the present invention.

For example, in the sanitary napkin 1 of the present embodiment, the planar shape of the embossed portion 52 is circular, but other than circular, it may be oval, triangular, rectangular, or a combination thereof. In addition, the pair of side leakage preventers 5 and 5 are preferably formed over the entire length of the absorbent main body 10, but may be formed at least on the part facing the wearer's excretion part.

In addition, in the unfolded state of the side leakage preventer 10 of this embodiment, as shown in FIG. 18 , circular recesses 52 a are arranged in a zigzag shape in plan view, but vertically elongated recesses 52 a may be arranged as shown in FIG. 20 . The recesses 52a form columns T1, T2, T3, T4 in the body length direction. In each column, the interval between the recessed parts 52a is a length P1 which is shorter than the length P2 of the main body longitudinal direction of the recessed part 52a. The columns T1 and T3 and the columns T2 and T4 are arranged equidistantly with respect to the imaginary line L in the body width direction, respectively. Moreover, the recessed part 52a in row T1 and row T2 is arrange|positioned at a position shifted in the main body length direction with respect to the recessed part 52a in row T3 and row T4. In addition, from the standpoint of increasing the three-dimensional height of the side leak-preventing portion 5 and thereby improving its leak-proof performance, it is preferable to form the linear elastic member in an elongated state along the imaginary line L with the side leak-preventing portion shown in FIG. 20 . The sheets 50 are bonded, and then the side leakage preventing portion 5 is formed.

In addition, the preferable manufacturing method of the side leak prevention part forming sheet 50 of this embodiment mentioned above is just an example, and it can manufacture by the method other than the method listed here. In addition, the sanitary napkin 1 does not need to have a pair of wing parts.

The absorbent article of the present invention (third invention) may be a sanitary napkin, a panty liner, an incontinence pad, or the like.

The parts omitted from description in the above-mentioned one embodiment and the parts included in only one embodiment can be used mutually as appropriate.

Claims (6)

1. absorbent commodity, it possesses the absorbent main body with absorbed layer and application of anti-leakage layers, and is in fact elongate shape, wherein, in the length direction both sides of skin contact face one side of described absorbent main body, is provided with a pair of side leakage barriers; Described a pair of side leakage barriers is formed by the irregular bulk non-woven fabrics of tool respectively; Described non-woven fabrics is overlapped into 2 layers according to having described concavo-convex face mode respect to one another, and the protuberance among relative described two sides on a face contacts with the protuberance on another face,

In described non-woven fabrics, recess is the embossed portion being processed to form by embossing, is configured to jagged pattern, and each embossed portion forms respectively discontinuously,

A pair of side leakage barriers covers respectively the length direction both sides of skin contact face one side of absorbent main body,

In skin contact face one side of absorbent main body, be provided with a pair of groove, the inner side edge portion of side leakage barriers is located in the outside of this groove,

Described protuberance is the state of having filled fibrous material,

The height of the described protuberance of inner surface one side that the embossed portion of take is border as the height of the described protuberance of T, outer surface one side be T ₁time, T compares T ₁high or equal.

2. absorbent commodity as claimed in claim 1, wherein, the described non-woven fabrics that forms described side leakage barriers in the width of described absorbent commodity described in side direction absorbed layer one side turn back, its end of turning back has formed the inner side edge portion of described side leakage barriers.

3. absorbent commodity as claimed in claim 1, wherein, described absorbent commodity has a pair of alar part stretching out from the dual-side of the length direction of described absorbent main body, and described a pair of alar part is formed by the described non-woven fabrics stretching out from described side leakage barriers respectively.

4. absorbent commodity, it possesses the absorbent main body with absorbed layer and application of anti-leakage layers, and is in fact elongate shape, wherein, in the length direction both sides of skin contact face one side of described absorbent main body, is provided with a pair of side leakage barriers; Described a pair of side leakage barriers is following formation respectively: by the side leakage barriers with a large amount of embossed portion, form sheet material has the end of turning back mode according to the inner side of the width in described absorbent main body described side leakage barriers is formed to the outside that sheet material is gone back to the described width of described absorbent main body; Described embossed portion is configured to jagged pattern, and each embossed portion forms respectively discontinuously; Front end in the described end of turning back does not form described embossed portion; It is stacked and engage integrated formation by a large amount of embossed portion by 2 above non-woven fabrics that described side leakage barriers forms sheet material; Non-embossed portion is swelled laterally by forming described embossed portion,

A pair of side leakage barriers covers respectively the length direction both sides of skin contact face one side of absorbent main body,

In skin contact face one side of absorbent main body, be provided with a pair of groove, the inner side edge portion of side leakage barriers is located in the outside of this groove,

Protuberance is the state of having filled fibrous material,

The height of the protuberance of inner surface one side that the embossed portion of take is border as the height of the protuberance of T, outer surface one side be T ₁time, T compares T ₁high or equal.

5. absorbent commodity, it possesses the absorbent main body with absorbed layer and application of anti-leakage layers, and be in fact elongate shape, wherein, length direction both sides in skin contact face one side of described absorbent main body are provided with a pair of side leakage barriers, and described a pair of side leakage barriers is following formation respectively: by the side leakage barriers with a large amount of embossed portion, form sheet material has the end of turning back mode according to the inner side of the width in described absorbent main body described side leakage barriers is formed to the outside that sheet material is gone back to the described width of described absorbent main body; Described embossed portion is configured to jagged pattern, and each embossed portion forms respectively discontinuously; Described embossed portion is side-prominent at the relative inner surface one of the described side leakage barriers formation sheet material turning back respectively; Described embossed portion front end separately forms plane, and this plane part is by filming,

A pair of side leakage barriers covers respectively the length direction both sides of skin contact face one side of absorbent main body,

In skin contact face one side of absorbent main body, be provided with a pair of groove, the inner side edge portion of side leakage barriers is located in the outside of this groove,

Protuberance is the state of having filled fibrous material,

The height of the protuberance of inner surface one side that the embossed portion of take is border as the height of the protuberance of T, outer surface one side be T ₁time, T compares T ₁high or equal.

6. the absorbent commodity as described in claim 4 or 5, wherein, described absorbent commodity has a pair of alar part stretching out from the dual-side of the length direction of described absorbent main body, and described a pair of alar part forms sheet material by the described side leakage barriers of stretching out from described absorbent main body respectively and forms.

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