TWI642417B - Absorbent article - Google Patents

Abstract

The present invention is an absorbent article comprising a liquid-permeable surface sheet (14), a liquid-impermeable back sheet (12), and a surface sheet (14) and a back sheet (12). The absorption body (13) between them is characterized in that a plurality of compression lines (22) which are formed by compressing the absorption body (13) and formed by a plurality of recesses (21) and intersect each other are arranged in the compression line (22) ) And / or the periphery of the intersection region (25) and / or the intersection region (25) are provided with a low basis weight portion (23).

Description

Absorbent article

The present invention relates to an absorbent article, and more particularly to a disposable diaper or absorbent pad.

Various improvements have been made in absorbent articles such as disposable diapers (hereinafter, also simply referred to as "diapers") to improve the function or wearing feeling.

The absorbent article absorbs most of the discharged body fluid through the absorbent body. Here, since the diaper covers the abdomen, buttocks, and hips, it is affected by the movements of various bodies, especially the legs, such as walking or turning over, baby crawling, and the like. In particular, the absorbent body may wrinkle, bend, or break due to various body movements. If this is the case, the fit of the diaper between the palate will be reduced, and the liquid leakage will easily occur. Furthermore, if the content of the super absorbent polymer (Super Absorbent Polymer (hereinafter also referred to as "SAP")) in the absorbent body is increased in order to improve the absorption retention of the absorbent body, the flexibility of the absorbent body itself tends to be lost. .

Therefore, as can be seen in Patent Document 1, there is an embossing process performed on the skin abutting surface side of the absorbent body, and the embossing process is inclined with respect to the direction extending from the front body piece to the back body piece of the diaper, and the slope extends. Lattice-shaped compression grooves. In this way, by embossing the absorbent body, it is possible to follow the forward and backward movement of the legs or the curvature of the buttocks, thereby improving the fit of the diaper between the hips and suppressing leakage of body fluids.

The embossing process is performed by pressing the embossed pattern on the surface. The pattern roller is formed by rotating and moving on a long absorbent sheet. In the production of a diaper, an embossing roll is rotated on a long absorbent sheet or the like to perform embossing, and then various sheets are laminated and cut to a desired size.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-016218

Therefore, there is proposed a compression groove for preventing the groove from being squashed even if the groove is subjected to pressure caused by the wearer's weight. The top sheet) side compresses the surface sheet together with the absorbent body, making it more difficult to be crushed. In this case, as described above, the compression groove is formed by rotating the embossing roller on the absorbent body on which the surface sheet is laminated. When the compression groove is formed in this manner, the surface sheet or the like located on the upper layer than the absorbent body will sink into the groove due to the rotation of the embossing roller, so that the surface sheet or the like easily becomes a strong stretched state. In particular, an embossed pattern having a component extending in an oblique direction, such as an oblique lattice shape, has a portion where the distance between the simultaneously compressed locations, such as near the lattice point, becomes shorter (the interval becomes narrower). If the distance between the sites that are compressed at the same time is short, the force of stretching the surface sheet from both adjacent compression sites strongly acts, so that the surface sheet easily becomes a strong stretched state. If so, the powdery SAP in the absorbent body abuts the surface sheet, and therefore, the surface sheet in the intersecting region is easily damaged during embossing.

In addition, the compression groove itself is located at a lower position than the uncompressed part, so it does not directly contact the wearer's skin, but near the lattice point, that is, the intersection of the lattice The fork region and / or its periphery are fixed in a state where the surface sheet and the absorbent body are stretched and strongly stretched. Therefore, there is a case where the powdery SAP in the absorbent body abuts the surface sheet. In this case, the intersecting region of the grid on the skin abutment surface of the surface sheet and / or its periphery becomes a harder part than the other parts, such as transmitting the rough feel of the superabsorbent resin as a feel.

Since the crossing area of the lattice will contact the wearer's skin, it will give the wearer a hard and rough skin feel, which is not good. In particular, the diaper is in contact with the soft skin parts such as the chin, so soft skin is required. If the cross part of the lattice is hard, the touch to the skin is not good.

The present invention has been made in view of such problems, and an object thereof is to provide a cross-region and / or the periphery thereof that do not become hard and easy to bend even if a grid-shaped embossing pattern is formed on the absorbent body, thereby making it easy to wear. An absorbent article with improved use feeling (softness).

In order to achieve such an object, the absorbent article of the present invention includes a liquid-permeable surface sheet, a liquid-impermeable back sheet, and an absorber disposed between the surface sheet and the back sheet. : There are arranged a plurality of mutually compressed lines which are formed by a plurality of recessed portions formed by compressing an absorber, and a low basis weight portion is provided at the intersection region of the compressed lines and / or the periphery of the intersection region.

As described above, according to the present invention, even if a grid-shaped embossed pattern is formed on the absorbent body, the intersecting region and / or its surroundings will not be hard, easily bent, and not easily broken, thereby enabling the wearer to wear. An absorbent article with improved usability (softness, non-roughness).

10‧‧‧ disposable diapers

10A‧‧‧Hook and loop

10B‧‧‧ Front Sticky Sheet

10C‧‧‧Her area

10D‧‧‧Elastic sheet

10F‧‧‧ Front body area

10L‧‧‧ Leg circumference opening

10R‧‧‧Back body area

10W‧‧‧ Waist opening

11‧‧‧ Cover sheet

11A, 13A‧‧‧Notch

12‧‧‧ bottom sheet (back sheet)

13‧‧‧ Absorber

13D‧‧‧High basis weight. Rolling section

13E‧‧‧High basis weight. Non-rolled section

13F‧‧‧ low basis weight. Non-rolled section

13G‧‧‧ low basis weight. Rolling section

14‧‧‧ top sheet (surface sheet)

15‧‧‧Pack of chips

16, 19‧‧‧ rubber thread

18‧‧‧Side Sheet

21‧‧‧ recess

21a‧‧‧Right recess (concave inclined to the first direction)

21b‧‧‧Left recess (concave inclined toward 2nd direction)

22‧‧‧ compressed line

22a‧‧‧The first compressed line

22b‧‧‧ 2nd compressed row

23‧‧‧low basis weight

23c‧‧‧Longitudinal low basis weight

24c‧‧‧Low Basis Weight Line

25‧‧‧Intersection

26‧‧‧ main absorption area

D1‧‧‧ Depth of recess

D2‧‧‧thickness of main absorption area

D3‧‧‧Thickness of the diaper in the recess

D4‧‧‧Thickness of Absorber in Recess

Diagonal line of L1‧‧‧1

L2‧‧‧ Adjacent low basis weight row 24c interval

S1‧‧‧ Formation interval of several first compressed lines

S2‧‧‧ Formation interval of several second compressed rows

M1‧‧‧ Front body part

M2‧‧‧ 胯

M3‧‧‧ hind body part

N1‧‧‧Compression area forming area

N2‧‧‧Compression area non-formation area (embossed pattern non-formation area)

P‧‧‧imaginary line

Q1, Q2, Q3, Q4‧‧‧ area

α, β‧‧‧ angle

FIG. 1 is a perspective projection view showing an appearance of an embodiment in which the absorbent article of the present invention is applied to a roll-up disposable diaper.

FIG. 2 is a partially cut-away plan view of the diaper shown in FIG. 1 as viewed from the skin contact surface side.

Fig. 3 is a cross-sectional view of the diaper shown in Fig. 2 cut along the line III-III.

Fig. 4 is a perspective projection view showing the diaper shown in Fig. 1 in an exploded state when it is unfolded.

Fig. 5 is a partial plan view of the absorbent body portion of the diaper shown in Fig. 1 as viewed from the top sheet side.

FIG. 6 is an enlarged partial plan view showing a part of the compressed row in FIG. 5 enlarged.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6.

FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. 6.

FIG. 9 is a sectional view taken along the line IX-IX in FIG. 6.

Fig. 10 is a sectional view taken along the line X-X in Fig. 6.

FIG. 11 is a cross-sectional view taken along line X-X of FIG. 6 according to a modification of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these embodiments, but also includes other absorbent articles belonging to the concept of the present invention.

[Embodiment 1]

FIG. 1 shows a deployed disposable diaper (a so-called sheet) according to Embodiment 1 of the present invention. Type disposable diaper) is a perspective view viewed from the surface side. FIG. 2 shows a plan view of the diaper shown in FIG. 1 as viewed from the skin contact surface side. Fig. 3 is a sectional view taken along the line III-III in Fig. 2. Further, Fig. 4 shows a divided state in which the unfolded disposable diaper shown in Figs. 1 and 2 is cut and unfolded.

The unfoldable disposable diaper (hereinafter, sometimes simply referred to as a diaper) 10 in this embodiment has a front body area 10F, a rear body area 10R, and a chin connecting the front body area 10F and the rear body area 10R. Area 10C. In addition, a waistline opening 10W is formed at a portion of the front body region 10F and the back body region 10R that surround the wearer's waist when worn. Similarly, a pair of left and right leg openings 10L are formed at the lower end portions of the front body region 10F and the rear body region 10R and the lower crotch region 10C to surround the thigh portions of the wearer's legs.

When wearing the diaper 10, the front body region 10F is located on the ventral side of the wearer, and the rear body region 10R is located on the back side of the wearer. In addition, the lower crotch region 10C covers the wearer's crotch and the wearer's legs pass through the left and right pair of leg circumference openings 10L, respectively. Therefore, the leg opening 10L is located at any position from the roots of the legs of the wearer to the periphery of the thighs.

The line along the central axis of the body from the wearer's head to the bottom when wearing the diaper 10 in the correct direction is used as the imaginary line P, and is used in the following description as necessary. As shown in FIG. 1, the imaginary line P is extended from the central portion of the diaper 10 through the sub-condylar portion from the ventral side to the dorsal side. Specifically, for example, if the waist side of the diaper 10 is up, and the lower side of the crotch is down, the imaginary line P extends along the surface of the diaper 10 in the up-down direction, and the back side is also in the up-down direction through the lower crotch. Extender. In other words, the vertical direction refers to the direction along the central axis of the body from the wearer's head to the lower part, and the imaginary line P extends along the central axis of the body.

A pair of left and right hook-and-loop fasteners 10A are bonded to the left and right end edges of the back sheet region 10R of the cover sheet 11 on the outer side of the diaper 10, and these hook-and-loop fasteners 10A and the front and back panel regions 10F are bonded to each other when they are worn. The edge portion overlaps and connects the two to form a leg opening 10L. The adhesive tape 10A is peeled and adhered to the front adhesive sheet 10B with respect to the cover sheet 11 adhered to the front body sheet region 10F. An elastic sheet 10D is bonded to the upper end of the body region 10R behind the cover sheet 11. The elastic sheet 10D extends along the width direction of the cover sheet 11 to give the wearer a moderate waist. The sense of dress.

As shown in FIGS. 2 to 4, the diaper 10 in this embodiment is a cover sheet 11 and a liquid-impermeable back sheet (back sheet) in order from the outside when viewed from the skin side of the wearer. 12. Absorbent body 13 (hereinafter, also referred to as absorbent body 13) wrapped with a chip (tissue paper) 15 which is a hydrophilic sheet material, and a top sheet (surface sheet) 14 which is in contact with the wearer's skin Sequentially overlapping and sticking together.

On the left and right sides of the lower region 10C of the cover sheet 11, a pair of notch portions 11A each forming a semicircular arc shape and serving as leg openings 10L are formed. The liquid-impermeable back sheet 12 is adhered to the cover sheet 11. The previous absorber 13 is disposed between the back sheet 12 and the liquid-permeable top sheet 14, and the top sheet 14 passes through the absorber. 13。 Adhesive to the bottom sheet 12. Near the center of the edges of the left and right sides of the bottom sheet 12 in the width direction, rubber threads 16 which are used to form leg gathers are bonded in an elongated state, respectively.

The liquid-permeable top sheet 14 in the present embodiment is provided with a pair of side sheets 18 which are liquid-impermeable (or water-repellent) sides forming a three-dimensional fold in the widthwise left and right edges of the top sheet 14 in the width direction. The pair of side sheets 18 is a member in which the outer end edge portion is formed in the same shape as one of the pair of cutout portions 11A of the cover sheet 11, The edges of the left and right sides of the absorbent body 13 stand up to prevent side leakage of urine excreted by the wearer. On each of a pair of side sheet materials 18, a rubber thread 19 as a three-dimensional pleated stretchable material is arranged in a stretched state in a manner that the inner end edge portion is folded back toward the absorbent body 13 and held, and the rubber thread 19 contracts. At this time, the side sheet 18 stands up in the skin-abutting direction of the wearer. The three-dimensional pleats may have a known structure used in a conventional disposable diaper. For example, it can be formed by sandwiching the stretched three-dimensional pleated stretchable material between the layers of the water-repellent sheet and fixing it. As shown in FIG. 2, the side sheet 18 is pulled in the longitudinal direction by the expansion and contraction of the rubber wire 19. Furthermore, as shown in FIG. 3, it becomes a three-dimensional fold by which the inside edge part stood up.

In addition, the diaper 10 based absorber 13 in this embodiment is extended along the virtual line P, and its length direction is parallel to the virtual line P. The direction orthogonal to the imaginary line P is the width direction. It should be noted that the ratio of the length direction to the width direction of the diaper 10 is not limited in this embodiment. This ratio can be appropriately changed according to the wearer's body type.

Next, the structure of the absorber part in this embodiment is demonstrated.

FIG. 5 is a partial plan view of the portion where the absorbent body 13 and the top sheet 14 are viewed from the top sheet 14 side.

The absorbent body 13 of the present embodiment located under the top sheet 14 mainly includes pulp and SAP. The absorbent body 13 is formed in an elongated shape so as to span the front body piece, the chin, and the back body piece. Furthermore, it is divided into three parts: a front body part M1, a chin part M2, and a rear body part M3. A pair of left and right leg openings 10L surrounding the thigh portion surrounding the two legs are formed in the lower part M2 to form a pair of arcuate cutouts 13A. Moreover, the notch portion 13A may not correspond to that of the absorber 13. Size formed. In addition, the absorber 13 of this embodiment is an hourglass type having a notch portion 13A and a narrower central portion than the front and rear ends, but the shape of the absorber of the present invention is not limited to this. If the front-to-back part is set to the front-back (up-down) direction and the direction orthogonal to it is set to the left-to-right direction, it includes various shapes. For example, the corners of the front-back (up-down) ends are cut into arcs. The shape, the shape of an ellipse extending in front and back (up and down), the shape of a circle, the shape of a rectangle with the same length in front and back (up and down), and the like.

The absorber 13 is wrapped with, for example, a chip 15 to maintain its shape. The chip 15 is a hydrophilic sheet whose ends are adhered to each other by a paste. The absorbent body 13 wrapped by the package chip 15 is disposed between the bottom sheet 12 and the top sheet 14. The top sheet 14 is adhered to the bottom sheet 12 via the absorber 13 wrapped by the chip 15. In addition, although the absorber 13 wrapped by the chip 15 is used in this embodiment, the absorber in the present invention may not be wrapped by the chip.

Further, as shown in FIG. 5, the diaper 10 has a compressed portion forming region (embossed pattern forming region) N1 that is compressed by regular embossing from the surface of the top sheet 14 toward the absorber 13. A plurality of compressed lines 22 are arranged and extended in the compressed portion forming area N1. The compressed lines 22 are formed by a plurality of recessed portions 21 that are continuously formed by compression, and the plurality of recessed portions 21 are formed in a diagonal grid pattern. Configured. Several compressed lines 22 cross each other. In addition, in the area where the compressed line 22 is not formed among the compressed area formation areas, a non-compressed main absorption area 26 is mainly provided. Moreover, as shown in FIG. 5, the embossed pattern is not formed on both ends of the absorber 13. Therefore, the absorber 13 is one in which the non-compressed portion formation area (embossed pattern non-formation area) N2 exists on both sides of the compressed portion formation area (embossed pattern formation area) N1. The purpose is to prevent body fluid from leaking through the leg opening 10L through the embossed pattern.

In this embodiment, the embossed pattern is formed to the upper end portion of the front body portion M1 and the lower end portion of the rear body portion M3. By forming the embossed pattern to the upper and lower ends in this way, the air permeability of the diaper 10 is improved, and the absorbent body 13 is easily bent, so that the diaper 10 is applied to the body of the wearer. Furthermore, in the present invention, the embossed pattern is not allowed to be formed to the upper end portion of the body portion M1 before the absorbent body 13 and the lower end portion of the rear body portion M3 and to be formed on the absorbent body 13. The appearance of the left and right ends.

The recessed portion 21 in this embodiment is a person inclined with respect to an imaginary line P along the central axis of the wearer's body when wearing a diaper. Specifically, the recessed portion 21 includes a rightward recessed portion 21a inclined at a predetermined angle α in the right direction of the work in the first direction with respect to the imaginary line P, and a leftward image in the second direction of the work at the predetermined angle β. The leftward recessed portion 21b is inclined. In addition, the recessed portions 21 inclined in the same direction are arranged in such a manner that the diagonal line of one grid is formed as a length L1, so as to form embossed patterns that are obliquely extended in a grid shape. Although the predetermined angle α and the predetermined angle β are set to the same value in this embodiment, they may be different values. In the present embodiment, the plurality of recesses 21 are formed by compressing the top sheet 14, the chip 15, and the absorber 13 together on the top sheet 14 side. In the present invention, the absorbent body 13 may be embossed together with the top sheet 14 as in this embodiment, or the top sheet 14 may be subsequently attached to the absorbent 13 after the embossing process.

As shown in FIG. 5, a line formed by arranging a plurality of rightward concave portions 21 a is referred to as a first compressed line 22 a, and a line formed by arranging a plurality of leftward concave portions 21 b is referred to as a second compressed line 22 b. The compressed rows 22 are straight lines that are inclined with respect to the virtual line P at the same angle as the inclination angle of the recessed portion 21. The first compressed rows 22a extend in parallel with a distance S1 from each other. The second compressed rows 22b are parallel to each other with an interval S2. Ground extension. In this way, the first compressed line 22a and the second compressed line 22b are extended to form an embossed pattern in a diagonal grid shape. In this embodiment, the first compressed line 22a and the second compressed line 22b intersect with each other to form an intersection region 25. Although the intervals S1 and S2 are set to the same value in this embodiment, they may be different values.

In addition, a low basis weight portion 23 is provided at the intersection region 25 and / or the periphery of the compressed row 22. FIG. 6 is an enlarged view of a part of the compressed row of the arrow VI part in FIG. 5. 5 and 6 are drawn for the sake of convenience, and the side sheet 18 is omitted. In FIGS. 5 and 6, the low basis weight portion 23 is indicated by a two-dot chain line. The low basis weight portion 23 is formed by adjusting the basis weight of pulp or SAP constituting the absorbent body 13 to reduce the basis weight when the absorbent body 13 is manufactured.

As shown in FIG. 6, on the surface of the absorber 13 of this embodiment, a diagonal lattice-shaped intersection region 25 of the first compressed row 22 a and the second compressed row 22 b is formed. Further, a plurality of low basis weight portions 23 are formed on the surface of the absorbent body 13. The low basis weight portions 23 extend in the extending direction (length direction) of the absorbent body 13 and are regions including a plurality of intersecting regions 25.

The low basis weight portions 23 of the present embodiment are arranged in parallel with an interval L2 from each other. However, the low-basis-weight portion 23 of the present invention may be provided at the intersection region 25 and / or its periphery, and is not limited to being arranged in parallel, that is, as long as the region having a lower basis weight than the surrounding region 25 and / or the intersection region 25 and / It may be formed in such a manner that at least a part of its periphery overlaps, and various aspects can be adopted.

The low basis weight part 23 is arrange | positioned so that the crossing area 25 may be included as mentioned above. In the present embodiment, when the absorbent body 13 is rolled, a recessed portion 21 is formed in the intersection region 25. At this time, a portion where the low basis weight portion 23 is formed is rolled, but the density of the rolled portion becomes low. Therefore, the absorber 13 of the low basis weight portion 23 in the intersection region 25 The density is lower than the density of the absorber 13 in the area other than the low basis weight portion 23 where the compressed rows 22 are formed.

In this embodiment, as shown in FIG. 5, the low-basis-weight portion 23 includes a longitudinal low-basis-weight portion 23 c formed in parallel with the virtual line P. A row formed by arranging a plurality of longitudinal low-basis-weight portions 23c is referred to as a low-basis-weight row 24c. In this embodiment, the low basis weight portion 23 has a vertical stripe shape, but in the present invention, it is not limited to this, as long as it is arranged so as to include the intersection region 25 and / or its surroundings, this embodiment can also be implemented The width of the vertical stripes increases or decreases. For example, various shapes such as a quadrangle, a circle, an oval, and a triangle can be adopted.

The low basis weight portion 23 of this embodiment is formed by, for example, the following steps (1) to (6). The absorbent pad (the absorptive body containing no chip in the description of this step) is formed by mixing pulp and powdery SAP, and blowing the resulting mixture to a filter such as two forming rollers.

(1) First, an absorbent pad having a fixed thickness is produced by a first forming drum.

(2) Secondly, an absorbent pad is intermittently produced by forming a pore in a portion corresponding to the low basis weight portion 23 by a second forming drum, and the laminate is laminated in the step (1). Absorbent body pad. Thereby, an absorbent pad having a recess is produced.

(3) Thereafter, the absorbent pad having the above-mentioned recess is wrapped with the packaged chip 15, and the packaged chip 15 and the absorbent pad are adhered with a hot-melt adhesive or the like to produce the absorbent body 13.

(4) The prepared absorbent body 13 is cut to the size of a diaper.

(5) The top sheet 14 is laminated on the absorbent body 13 after the cutting.

(6) The top sheet 14 and the absorber 13 are compressed together by an embossing roller.

By the suction and conveyance of the absorbent body 13 in step (3) and the embossing processing in step (6), the package chip 15 is adhered to the concave bottom portion of the recess, and the low basis weight portion 23 has a shape as shown in FIG. 8 below, for example. In addition, the low basis weight portion 23 can be provided not only by two forming rollers as in this embodiment, but also in the present invention, it can be provided during embossing. For example, the cross section 25 is rolled by rolling the absorbent body 13 of the cross section 25 to the surroundings, and a low basis weight portion 23 is provided in the cross section 25.

In the intersecting region 25 of the recessed portion 21, the stretching increases as the distance between the compressed portions approaches. Therefore, from the viewpoint of making the top sheet 14 less likely to break, it is preferable to reduce the basis weight corresponding to the distance. Therefore, it is preferable that the basis weight of the low basis weight portion 23 is formed such that it becomes lower toward the center of the intersection region 25 (for example, in a mortar shape). With this configuration, the intersecting region 25 does not become hard, so that the top sheet 14 is not easily broken, and the diaper 10 is easily bent in any direction with the extending direction of the lattice edge of the recessed portion 21 as an axis, thereby improving the fit. .

In the present embodiment, the recessed portions 21 of the embossed pattern in the oblique lattice shape are formed by embossing the surface of the embossing roller having a mold matching the recessed portion 21 while rotating and pressing. As shown in FIG. 5, if the embossing roller rotates and travels in the direction of the arrow W (the direction from the front body portion M1 to the rear body portion M3), it is orthogonal to the direction W of the embossing roller All the portions of the recessed portions 21 arranged in the direction are simultaneously pressed. In this embodiment, the size of the embossing roller is determined in such a manner that the circumference of the embossing roller is equal to the length in the length direction of the absorber 13, but it is not limited thereto.

Furthermore, in this embodiment, the direction W of the embossing roller travels parallel to the direction of the imaginary line P when the diaper 10 is completed. As described above, the top sheet 14 is laminated on the absorbent body 13 that has been cut to the size of the diaper 10, and the top sheet 14 and the absorbent 13 are compressed together by an embossing roller. The cutting is completed across the length of the front body piece, the chin, and the back body piece of the diaper 10. Therefore, by making the direction W of the embossing roller parallel to the imaginary line P, it is possible to form a slant inclined with respect to the imaginary line P Grid Embossed pattern. As such, in this embodiment, the traveling direction W of the embossing roller is parallel to the extending direction of the low-basis-weight portion 23, so that it is easy to align the several intersecting regions 25 with the low-basis-weight portion 23.

Therefore, the rightward concave portion 21a is inclined to the right with respect to the traveling direction W, and the leftward concave portion 21b is inclined to the left. Therefore, as the embossing roller advances in the traveling direction W, the distance between the adjacent rightward recessed portion 21a and the leftward recessed portion 21b becomes shorter as it goes toward the intersection region 25.

Here, when the embossing roller forming the recessed portion 21 is pressed, the top sheet 14 is stretched so as to be drawn into the recessed portion 21. Since the adjacent rightward recessed portion 21a and the leftward recessed portion 21b are simultaneously pressed and formed, the top sheet 14 positioned therebetween is stretched from left to right. That is, in FIG. 6, the top sheet 14 is stretched by applying the pull-in force shown by the arrow A simultaneously on the left and right. The shorter the distance between the adjacent rightward concave portion 21a and the leftward concave portion 21b, the less the buffering portion of the top sheet 14 with respect to the pull-in force A is stretched, and therefore the top sheet 14 is gradually extended to a strong state. Therefore, the SAP in the absorbent body 13 abuts the top sheet 14 to form a rough surface on the top sheet 14. This can cause irritation to the wearer's skin and is not good.

When the embossing roller is pressed deeper to form the recessed portion 21, the top sheet 14 is further stretched, so that the top sheet 14 may be damaged. However, if the embossing roller is pressed only shallowly to form the recessed portion 21, the adhesion effect between the top sheet 14 and the absorbent body 13 becomes weak, so that the top sheet 14 is easily peeled from the absorbent body 13, and thus it is not even clear. Embossed pattern.

Therefore, the recessed portion 21 of the present embodiment enters into the intersection region 25 with a low basis weight while the distance between the adjacent rightward recessed portion 21a and the leftward recessed portion 21b is shortened. Therefore, the top sheet 14 is not strongly stretched. The recessed portion 21 is formed. To be pushed into The absorbent body 13 is small, so the top sheet 14 is not easily broken, and the corners formed in the intersection region 25 do not harden and feel better, and the surface of the top sheet 14 becomes smooth. Furthermore, the flexibility of the top sheet 14 and the absorbent body 13 can be maintained, and the top sheet 14 can be prevented from being peeled from the absorbent body 13.

In addition, in the recessed portion 21 of this embodiment, an intersection region 25 having a low basis weight is intermittently formed in the extending direction of the compression line 22. As a result, the diaper 10 of this embodiment can improve the bending ease and flexibility in the intersecting region 25 of the compression line 22 compared with the case where only the recessed portion 21 is formed, so that the wearer of the diaper 10 can be made more flexible. Soft skin feel.

FIG. 7 is an enlarged schematic view of the cross-sectional shape of the line VII-VII of FIG. 6, FIG. 8 is an enlarged schematic view of the cross-sectional shape of the line VIII-VIII of FIG. 6, and FIG. 9 is an enlarged cross-sectional shape of the line IX-IX of FIG. 6. An enlarged schematic diagram, FIG. 10 is an enlarged schematic diagram of the cross-sectional shape of the line XX in FIG. 6. In the cross-sectional views of FIGS. 7 to 10, the density of the absorber 13 is represented by the density of dots.

As shown in FIG. 7, the cross-sectional shape in the vicinity of the recess 21 is wider at the open end than at the bottom. The part indicated by the symbol 13D is a high basis weight in the absorbent body 13 and a high basis weight after rolling. Rolling section. The part indicated by the symbol 13E is a high basis weight in the absorbent body 13 and a high basis weight without rolling. Non-rolled section. That is, high basis weight. The embossed portion 13D indicates a recessed portion 21 other than the intersection area 25, and has a high basis weight. The non-rolled portion 13E indicates the absorber 13 in the main absorption region 26. Here, the absorber 13 mainly includes SAP and pulp as described above, and the density is mainly related to the pulp fiber density. Therefore, high basis weight. The rolling section 13D is a state in which the pulp is compressed so that the gap between the pulps is small. On the other hand, the basis weight is high. The gap and high basis weight between non-rolled sections 13E series pulp. The state in which the rolled portion 13D is relatively large.

In addition, since the recessed portion 21 is used as a top sheet 14 of synthetic fiber It is compressed and bonded together with the absorbent body 13 whose main component is pulp to form a film. Therefore, the bottom surface of the recessed portion 21 promotes the diffusion of the body fluid in the direction of the compression line 22 until the body fluid is absorbed.

Turning to FIG. 8, in the present embodiment, in the low basis weight portion 23, the absorber 13 is adhered to the top sheet 14 and the chip package 15. The cross-sectional shape of the intersection region 25 is shown in FIG. 9. The part indicated by symbol 13F is a low basis weight in the absorbent body 13 and a low basis weight without rolling. Non-rolled section. The part indicated by the symbol 13G is a low basis weight in the absorbent body 13 and a low basis weight after rolling. Rolling section. That is, low basis weight. The non-rolled portion 13F indicates that those in the low basis weight portion 23 that have not been rolled have a low basis weight. The rolled portion 13G indicates a rolled portion in the low basis weight portion 23. In this embodiment, as shown in FIG. 9, the low basis weight portion 23 (low basis weight. Rolled portion 13G) in the intersection region 25 is also pushed in until the thickness is the same as that of the recessed portion 21. However, the basis weight is low. Therefore, it is possible to maintain a lower density than the recessed portion 21 (high basis weight. Rolled portion 13D) other than the intersection region 25. That is, as shown in FIG. 9, although the absorbent body 13 (low basis weight. Rolled portion 13G) in the cross region 25 is lower than that shown in FIG. 8. The non-rolled portion 13F is rolled, but has a lower density than the recessed portion 21 (high basis weight. Rolled portion 13D) other than the intersection region 25. In this way, in the intersecting region 25 of the absorbent body 13, both the maintenance of low density and the reduction in thickness can be taken into account, so the flexibility can be maintained in the intersecting region 25. In this embodiment, the density of the absorber 13 (low basis weight. Rolled portion 13G) in the cross region 25 is lower than that of the absorber 13 (high basis weight. Density of rolling section 13D). Moreover, in the present invention, as long as the effect of softening the intersection region 25 and / or its periphery can be exhibited, the density of the absorber 13 in the low basis weight portion 23 and the density of the absorber 13 in the intersection region 25 are allowed to be equal. Appearances, or appearances above that density. In this embodiment, as shown in FIG. 10, the thickness of the absorbent body 13 at the bottom of the compressed line 22 including the intersecting region 25 is formed. The degree is approximately constant, but is not limited to this in the present invention. For example, compression may be performed so that only the thickness of the intersection region 25 becomes thin. That is, a recessed portion deeper than the recessed portion 21 of the compressed row 22 may be provided in the intersection region 25 where the low basis weight portion 23 is provided. According to this configuration, not only the intersection region 25 becomes softer but also the intersection region 25 becomes thin due to the presence of the low basis weight portion 23, so that the intersection region 25 is easily bent. At this time, the density of the absorber 13 of the low basis weight portion 23 in the intersection region 25 may be equal to or higher than the density of the absorber 13 of the compression row 22 other than the low basis weight portion 23.

As shown in FIG. 10, in the compressed line 22, the low basis weight of the absorber 13 as the compressed line 22 of the area including the intersecting area 25. The density of the rolled portion 13G is lower than the high basis weight of the absorber in the area where the recessed portion is formed in the compressed row 22 as the area not including the intersection area 25. Density of the rolled portion 13D.

Next, an embodiment of an embossed pattern formed by embossing will be described.

As shown in FIG. 5, the embossing pattern of this embodiment is a grid shape formed by arranging a plurality of continuously extending concave portions 21, and is arranged such that the length of the diagonal L1 of one grid is 42 mm (4.2 cm). There are recesses 21. As shown in FIGS. 5 and 6, the embossed pattern of the present embodiment is such that the first compressed line 22 a extends in parallel at an interval S1, and the second compressed line 22 b extends in parallel at an interval S2. Then, the first compressed line 22a and the second compressed line 22b form an embossed pattern in a diagonal grid shape. The lengths S1 and S2 of one side of the lattice in this embodiment are equal to 29.7 mm. The interval of the grid is preferably 13.0 mm or more and 54.0 mm or less.

Here, the depth of the recessed portion 21 of the absorbent body 13 is set to D1, and the thickness of the absorbent body 13 and the top sheet 14 before the embossing process, that is, the thickness of the main absorbent region 26 including the absorbent body 13 and the top sheet 14 The maximum thickness is set to D2. The thickness of the diaper 10 is D3, and the thickness of the absorber 13 of the recessed part 21 is D4. In this embodiment, the thickness D2 is 8.0 mm, and preferably 5.0 mm to 20.0 mm. In this embodiment, as shown in FIG. 7, the thickness D3 is 1.0 mm. The thickness D4 (see FIG. 7) of the absorber 13 in the recess 21 is preferably 0.2 mm to 0.6 mm.

If so, the depth D1 of the recess 21 is about 42.5% to 97.5% of the thickness D2. As described above, in the recessed portion 21 in this embodiment, the recessed portion 21 is formed by compressing the absorbent body 13 in the direction of the back sheet 12 during pressing by an embossing roller.

The density of the absorber 13 (low basis weight. Rolled portion 13G) in the cross region 25 in the embossed pattern of this embodiment is 0.8 g / cm ³ , preferably 0.5 g / cm ³ to 1.2 g / cm ³ . In addition, the density of the absorber 13 (high basis weight; rolled portion 13D) of the recessed portion 21 other than the cross region 25 of this embodiment is 1.38 g / cm ³ , preferably 0.8 g / cm ³ to 1.9 g / cm ³ . Furthermore, the density of the absorbent body 13 (high basis weight. Non-rolled portion 13E) other than the recessed portion 21 of this embodiment is 0.05 g / cm ³ , preferably 0.03 g / cm ³ to 0.07 g / cm ³ .

By forming the absorber 13 with such a density distribution, the rigidity of the intersection region 25 can be softened. Therefore, even if a grid-like embossed pattern is formed on the absorbent body 13, the crossing region 25 does not become hard and is easily bent, thereby improving the wearer's usability (softness).

By forming the recessed portions 21 at such depths and intervals, the groove can be maintained even when weight is applied, and the skin contact surface at the lower part of the diaper can maintain a soft skin feel. Therefore, the diagonal embossed pattern can prevent deformation of the diaper from wrinkling and other deformations with respect to the legs, and can make the skin soft to the touch and strongly suppress skin irritation.

Here, as shown in FIG. 6, a thin and medium-density intersecting region 25 is set to Q1, and a thin and high-density intersecting region 22 in the width direction is sandwiched. Let Q2 be Q3, and set the thick and low-density main absorption region 26 as Q3, and set the thin and high-density region along the extending direction of the compression line 22 as Q4. The sequence of the rigidity (bending difficulty, bending strength) of such a density distribution diaper 10 can be set from the soft (and easy to bend) part to the hard (and not easy to bend) part as region Q1 <region Q3 < The sequence of area Q2 <area Q4.

In this way, regarding the rigidity of the absorbent body 13, the thinner and higher-density region Q4 along the extending direction of the compression line 22 is formed the hardest, and the rigidity of the absorbent body 13 is made in the direction sandwiching the intersecting region 25. By softening, when the wearer moves while wearing the diaper 10, the diaper 10 can be deformed in such a manner that the diaper 10 bulges away from the body of the wearer and maintains a space between the body of the wearer and the diaper 10. Thereby, even if a grid-like embossed pattern is formed on the absorbent body 13, the crossing region 25 does not become hard and is easily bent, thereby improving the wearer's usability (softness). In addition, by making the crossing region 25 soft, it is possible to prevent the absorbent body 13 in the crossing region 25 from being easily broken due to the action of the wearer.

[Modification]

The present invention is not limited to the above-mentioned embodiments, and may be appropriately changed or modified without departing from the technical idea of the present invention.

For example, in the above-mentioned embodiment, the case where the embossing process is performed using an embossing roller has been described, but it is not limited to this method, and it may be a plate-shaped embossing plate consistent with the size of the diaper. Embossing and other methods based on the size of the diaper.

In addition, not only the top sheet 14 is disposed after the absorbent body 13 is wrapped with a hydrophilic sheet, but also the top sheet may be disposed directly on the absorbent body 13. 14%. Moreover, a liquid diffusion sheet which improves liquid diffusibility may be provided between the top sheet 14 and the hydrophilic sheet. With this sheet, the body fluid is more easily diffused. The hydrophilic sheet may be attached so as to surround the absorbent body 13, or may be disposed so as to overlap only the front surface and the back surface without covering the end portion of the absorbent body 13.

In the above embodiment, the compressed rows 22 are formed by the recessed portions 21 which are continuous grooves. However, the compressed rows 22 may be formed by discontinuous (for example, intermittent) grooves (see the following modification). . In addition, the shape of the concave portion 21 is not limited to the shape shown in this embodiment, and various shapes such as a quadrangle, a circle, an oval, and a triangle can be adopted.

The disposable diaper 10 according to the above embodiment can be applied to either an adult or a child. Moreover, in the said embodiment, although the expanded diaper 10 (a so-called sheet-type diaper) was demonstrated as an example, it can of course be applied to a shorts-type diaper. The absorbent article of the present invention is not limited to diapers, but can be applied to the entirety of other general absorbent articles such as absorbent pads and leaky pads. For example, as shown in FIG. 5, according to the structure of the absorbent body 13 and the top sheet 14, the present invention can also be applied to an absorbent pad and the like, and has the same effect as a diaper.

In the above-mentioned embodiment, only one side of the absorbent body 13 is embossed, but it is not limited thereto, and double-sided embossing may be used. That is, embossing is performed from both sides of the top sheet 14 side and the bottom sheet 12 side, so that the concave portions 21 are formed on both the front and back surfaces of the absorbent body 13. As a result, the pressure is not concentrated on a single surface of the surface of the absorbent body 13 and the back surface. Therefore, even if it is not pressed deeply during embossing, the compression line 22 can be clearly formed, and the diaper 10 can be kept flexible Sex.

Moreover, in the said embodiment, the recessed part 21 was formed continuously, but in this invention, the recessed part 21 may be formed discontinuously. With this, in the intersecting region 25 The shape of the low basis weight portion 23 (low basis weight. Rolled portion 13G) also changes. FIG. 11 is a cross-sectional view taken along line X-X of FIG. 6 according to a modification of the present invention. Those elements having the same function among the elements constituting the diaper of the present modification are denoted by the same reference numerals as those in the above-mentioned embodiment, and descriptions thereof are omitted.

In this modification, the recessed portion 21 is not formed in a portion corresponding to the intersection region 25 where the compressed rows 22 intersect. If so, as shown in FIG. 11, the low basis weight portion 23 (low basis weight. Rolled portion 13G) in the intersecting region 25 is not rolled, and is slightly reduced as the concave portion 21 around the intersecting region 25 is rolled. Compressed, it forms a slight bulge toward the skin contact side in a cross-section (see FIG. 6 of the above embodiment for comparison). With this configuration, the density of the absorber 13 in the intersection region 25 becomes lower than the density of the recessed portion 21, so that the same effect as that of the above embodiment can be obtained.

In the above embodiment, as shown in FIG. 3 or FIG. 8, the low basis weight portion 23 is bonded to the package chip 15, but in the present invention, it may not be bonded. With this arrangement, when the absorbent body 13 is rolled, a recessed portion 21 is formed in the intersection region 25, and at this time, a portion where the low basis weight portion 23 is formed is not rolled (or is not easily rolled).

Claims (6)

An absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable back sheet, and an absorber disposed between the surface sheet and the back sheet, characterized in that a plurality of the absorbent articles are arranged A compression line consisting of a plurality of recesses formed by compressing the surface sheet and the absorbent body and intersecting each other; a low line is provided on all of the intersection area of the compression line and / or all of the intersection area. Basis weight portion; the absorption system is interposed between the bottom of the recessed portion and the back sheet. The absorbent article according to claim 1, wherein the density of the absorbent body in the low basis weight portion in the intersecting region is lower than the density of the absorbent body in the area where the compression line is formed other than the low basis weight portion. The absorbent article according to claim 1, wherein the density of the absorbent body of the low basis weight portion in the intersecting region is equal to the density of the absorbent body of the area where the compression line is formed other than the low basis weight portion, or Above this density. The absorbent article according to any one of claims 1 to 3, wherein the plurality of recessed portions are formed by compressing the surface sheet and the absorbent body on the surface sheet side. The absorbent article according to any one of claims 1 to 3, wherein the plurality of recesses are continuous grooves. The absorbent article according to claim 4, wherein the plurality of recesses are continuous grooves.