JP6223413B2 - Absorbent articles - Google Patents

Description

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

  Absorbent articles such as sanitary napkins, panty liners, and incontinence pads are worn while in contact with the wearer's crotch, so that the wearer's body should be protected from discomfort and discomfort. Absorbent articles that are easy to deform following the shape (that is, excellent fit) have been studied.

  As such an absorbent article, for example, Patent Document 1 discloses an absorbent article including an absorbent layer, and the absorbent layer includes a plurality of slits or a stretchable zone formed by local stretching. The absorbent article has been proposed. According to the absorptive article indicated by this patent documents 1, it is supposed that the physical compatibility (namely, fit nature) to the wearer of an absorptive article can be improved.

Special table 2007-523665 gazette

The absorbent article disclosed in Patent Document 1 is not provided with an extensible zone according to a wearer's movement mode, and the extensible zone extends in the longitudinal direction from the front region in the longitudinal direction of the absorbent article. It is provided over the back side area. However, the absorbent article worn by the wearer, in the longitudinal rear side region corresponding to the wearer's buttocks, when the wearer performs an operation such as walking, the wearer's buttocks move alternately left and right Since a force is applied in a direction twisting around the longitudinal direction of the absorbent article, when the extensible zone is arranged as in Patent Document 1 described above, the force in the twisting direction in the rear side region is It is transmitted to the area corresponding to (or in contact with) the excretion opening, whereby the area corresponding to the excretion opening may be deformed, causing the wearer to feel a foreign object, a sense of incongruity, etc. there were.
Further, as in the absorbent article disclosed in Patent Document 1, when the absorber is configured to be stretchable by a slit or the like, the absorption performance of the absorber (particularly, the portion configured to be stretchable by a slit or the like) In general, the absorption performance is reduced. However, in the absorbent article disclosed in Patent Document 1, the absorbent performance of the absorber is not specifically taken into consideration, and therefore the absorbent performance of the absorbent body is sufficiently exhibited depending on the wearer's operation mode, wearing time, and the like. However, there is a possibility that leakage of excretory fluid discharged from the wearer, liquid return (rewetting), or the like may occur.

  Then, an object of this invention is to provide the absorbent article which had the outstanding wearing feeling and high absorption performance.

  The absorbent article which concerns on 1 aspect (aspect 1) of this invention is a longitudinally long main-body part which has a longitudinal direction and a width direction, a pair of flap part extended on the both sides of the longitudinal direction of this main-body part, and this pair of An absorbent article comprising a pair of longitudinally extending adhesive fixing portions disposed on each of the flap portions, wherein the main body portion is on the front side of the wearer when the absorbent article is worn. In the longitudinal direction of the pair of pressure-sensitive adhesive portions in plan view, the front-side edge portion in the longitudinal direction located, the rear-side edge portion in the longitudinal direction located on the wearer's rear side when wearing the absorbent article, A first region extending between the first imaginary straight line including a pair of first ends located on the proximal side with respect to the front end edge portion of both ends and the front end edge portion; Extending between the second imaginary straight line including the longitudinal center part of each of the pair of adhesive portions and the first imaginary straight line A second imaginary straight line including a second region and a pair of second end portions located proximal to the rear end edge portion of both ends in the longitudinal direction of the pair of adhesive portions, and the second A third region extending between a virtual straight line and a fourth region extending between the third virtual straight line and the rear edge, wherein the fourth region is The second region includes an extension region that is extendable at least in the longitudinal direction, and the second region extends across a central axis in the width direction extending in the longitudinal direction of the main body in a plan view and has a lower extension rate than the extension region. A low-elongation region having or not extending, and the low-elongation region extends in the longitudinal direction of the main body at least on both sides of the central axis in the width direction in plan view and more than other portions. A plurality of linear recesses having a high density bottom are provided.

Since the absorbent article of this aspect 1 is constituted so that the 4th field used as a field corresponding to a wearer's buttocks may include an extension field, when a wearer performs operation, such as walking, it is By moving the collar portion alternately left and right, a force is exerted in a direction in which the absorbent article is twisted around the longitudinal direction of the absorbent article in the rear region of the absorbent article (hereinafter, simply referred to as “twisted direction”). Even if the extension region is added, the extension region is deformed not only in the longitudinal direction that can be extended, but also in a direction twisted around the longitudinal direction in accordance with the movement of the wearer. The four regions can maintain a state of being in close contact with the skin surface of the wearer (that is, an excellent wearing feeling can be obtained), and the above-described twisting force is buffered by the deformation of the extension region. The wearer's Corresponding (or contacting) the 泄口 less likely to be transmitted to the region (at least a second region).
Furthermore, the absorbent article according to the first aspect is configured such that the second region serving as a region corresponding to (or in contact with) the wearer's excretion opening includes a low-elongation region (that is, a region that is difficult to deform). Therefore, in the second region, which is relatively less affected by the wearer's movement or the like, it is easy to maintain the shape of the main body (that is, the shape of the main body is difficult to deform), and excretion discharged from the wearer. The liquid can be stably absorbed over a long period of time.
Moreover, the absorbent article of aspect 1 has a plurality of lines in which the low extension region extends in the longitudinal direction of the main body at least on both sides of the central axis in the width direction and has a bottom portion with a higher density than other portions. Since the concave portion is provided, a force in a direction in which the absorbent article is twisted is applied to the rear region of the absorbent article by the wearer's movement, or a force in the width direction of the main body portion is applied by the wearer's buttocks. Even in the case where the wearer is added, the rigidity of the hard linear recess is particularly large in the region corresponding to the excretion opening of the wearer (ie, the region sandwiched between the linear recesses). Thus, the shape of the main body can be more easily maintained, and the excretory fluid discharged from the wearer can be more stably and steadily absorbed. Further, in the region sandwiched between the linear recesses, the absorbent material in the main body is partitioned by the linear recesses and is difficult to move from the region. The absorption performance of the region corresponding to the person's excretion opening) can be exhibited well and stably.
As a result of the above, the absorbent article according to the first aspect can achieve both excellent wearing feeling and high absorption performance.

  In another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the third region includes a low extension region extending from the low extension region of the second region, and the low extension region. An extension region located on both sides in the longitudinal direction of the main body portion and extending from the extension region of the fourth region, and the low extension region in the third region is in the second region A plurality of linear recesses extending from each of the plurality of linear recesses of the low extension region;

  The absorbent article according to aspect 2 is worn because the low-elongation region exists from the second region to the third region, and a region where the main body portion is difficult to deform can be secured more widely. The excretory fluid discharged from the person can be absorbed more stably and reliably. Moreover, since the said main-body part has the said expansion | extension area | region extended from the said 4th area | region on the both sides of the longitudinal direction of the said main-body part with respect to the said low expansion | extension area | region in the said 3rd area | region, a wearer's walk etc. Even when the above-mentioned twisting force is transmitted from the rear region of the absorbent article due to the movement of the absorbent article, or when the force is applied in the width direction of the main body by the wearer's buttocks, the first These forces can be buffered by deformation of the extension region in three regions. Thereby, the absorbent article of the present aspect 2 has a widthwise central portion (that is, a low-extension region (particularly, a low-extension region sandwiched between the plurality of linear recesses) in the second region and the third region of the main body. )) Is more easily maintained, so that the excreted fluid discharged from the wearer can be more stably and reliably absorbed.

  Furthermore, in another aspect (aspect 3) of the present invention, in the absorbent article according to aspect 1 or 2, the first region includes a low elongation region extending from the low elongation region of the second region.

  In the absorbent article according to aspect 3, the low extension region exists from the second region to the first region, and the shape of the main body portion is easily maintained (that is, the region is not easily deformed). Since it can be widely secured, in particular, in the region on the front side in the longitudinal direction of the main body part, which is relatively less affected by the wearer's movement and underwear elongation, the shape of the main body part is easy to maintain, The excretory fluid discharged from the wearer can be more stably and reliably absorbed over a long period of time.

  Furthermore, in another aspect (aspect 4) of the present invention, in the absorbent article according to any one of aspects 1 to 3, the fourth region is located between the rear side edge and the extension region. Includes a low elongation region.

  In the absorbent article according to aspect 4, the region between the rear side edge and the extension region in the fourth region is a portion that is relatively less affected by the movement of the wearer or the extension of the underwear. In addition, when the low elongation region is arranged in such a region, it is possible to ensure excellent strength and absorption performance as an absorbent article.

  Furthermore, in another aspect (aspect 5) of the present invention, in the absorbent article according to any one of aspects 1 to 4, the main body portion is a liquid-permeable surface sheet positioned on the skin surface side in the thickness direction, A liquid-impermeable back sheet positioned on the non-skin surface side in the thickness direction, and an absorber positioned between each of the sheets and extending from the first region to the fourth region. The absorber includes a plurality of slit portions extending in the width direction of the main body portion in the extension region.

In the absorbent article according to aspect 5, the absorbent body constituting the main body portion has a plurality of slit portions extending in the width direction of the main body portion in the extension region, so that the wearer performs an operation such as walking. The extension region deforms not only in the longitudinal direction in which it can be stretched but also in the above-described twisting direction in accordance with the movement of the wearer (especially, the left and right alternate movement in the buttocks) and the extension of the underwear. It is easy and the area | region containing the said expansion | extension area | region can be closely_contact | adhered to a wearer's skin surface more accurately and more reliably.
Furthermore, since the absorbent body occupying most of the thickness of the main body portion of the absorbent article has a plurality of slit portions, not only the absorbent body but also the flexibility of the main body portion (particularly in the thickness direction and Since flexibility in the width direction) can be imparted, it is possible to obtain further excellent body compatibility (that is, fit) as an absorbent article.

  Furthermore, in another aspect (aspect 6) of the present invention, in the absorbent article according to aspect 5, the plurality of slit portions are adjacent to each other in the longitudinal direction of the main body portion in plan view. Are arranged so as to partially overlap.

In the absorbent article of aspect 6, the plurality of slit portions in the elongated region are arranged so that the slit portions adjacent to each other in the longitudinal direction of the main body portion partially overlap in the longitudinal direction in plan view. (In other words, the plurality of slit portions in the extension region are arranged so that the slit portions adjacent to each other in the longitudinal direction of the main body portion do not completely overlap in the longitudinal direction in plan view. ), When the stretched region is deformed in the longitudinal direction or the twisting direction by the wearer's movement or the like, the absorber is torn in the slit portion, and the absorber is torn in the longitudinal direction. It becomes difficult to happen.
Further, in the absorber, a portion where the slit portion does not exist can exhibit a predetermined absorption performance. Therefore, when a plurality of slit portions are arranged as described above in the extension region, the predetermined absorption is achieved. A portion capable of exhibiting performance is not unevenly distributed in the extension region, and a predetermined absorption performance can also be exhibited in the extension region.
Therefore, the absorbent article according to the present aspect 6 can more reliably exhibit the above-described effects obtained by the elongated region, and can also stably exhibit the absorption performance in the elongated region.

  Furthermore, in another aspect (aspect 7) of the present invention, in the absorbent article according to aspect 5 or 6, the absorbent body includes a slit part existence region in which the plurality of slit parts are present in the extension region, and a slit part. And the slit part non-existing region is a first non-extended region extending from the one end to the other end in the width direction of the absorber in plan view. And a second non-existing region that intersects the first non-existing region and extends rearward from one end to the other end in the width direction of the absorber. , In a region surrounded by the first non-existing region and the second non-existing region.

  The absorbent article of this aspect 7 has the slit portion nonexistent region extending in the specific two directions in the extension region, while sufficiently ensuring the strength and absorption performance as the absorber. By having the slit part existence area surrounded by the slit part non-existence area, the extension range of the absorber can be made longer, so even if the wearer's movement is large, the good absorption performance is maintained. In addition, the main body can be securely adhered to the wearer's skin surface.

  Furthermore, in another aspect (aspect 8) of the present invention, in the absorbent article according to any one of the aspects 5 to 7, the topsheet extends in the width direction and at a predetermined interval in the longitudinal direction in the extension region. It has an extendable concavo-convex structure constituted by a plurality of linear ridges arranged in parallel and a plurality of linear dents located between adjacent ridges and extending in the width direction.

  In the absorbent article of aspect 8, since the topsheet has the above-described stretchable uneven structure in the stretched region, the stretched region of the main body portion is more easily deformed in accordance with the movement of the wearer. In addition, it is possible to more reliably realize a state in which the region including the elongated region is in close contact with the skin surface of the wearer (that is, it is possible to further improve the wearing feeling of the absorbent article), and The above-described twisting force applied to the rear region is further less likely to be transmitted to the region corresponding to (or in contact with) the wearer's excretion opening (at least the second region).

  Furthermore, in another aspect (Aspect 9) of the present invention, in the absorbent article according to any one of Aspects 5 to 8, the back sheet has a bellows structure extending in the longitudinal direction of the main body in the elongated region. .

In the absorbent article according to this aspect 9, since the liquid-impermeable back sheet has a bellows structure in the elongated region, the back-sheet is liquid-impervious due to the characteristic of the liquid impermeability of the wearer. The stretchability in the longitudinal direction of the stretched region can be more reliably obtained by the stretchable bellows structure while ensuring.
In addition, as described above, when a plurality of slit portions are formed in the absorber, excretion fluid discharged from the wearer easily reaches the back sheet through the slit portions. This absorbent article can diffuse the excretory fluid that has reached the back sheet in the width direction along a groove extending in the width direction of the bellows structure. Thereby, even if the excretion liquid discharged from the wearer reaches the back sheet through the slit portion, the excretion liquid is diffused in the width direction in the back sheet, and the non-skin surface side of the absorber It can be absorbed from a wide area on the surface.
Furthermore, since the back sheet has the above-described bellows structure, flexibility and cushioning properties can be imparted in the thickness direction of the absorbent article, so that the wearing feeling of the absorbent article is further improved. Can do.
Further, if the back sheet has a bellows structure in the extension region, it is easy to visually recognize that the region is an extensible part. There is also an advantage that it is easy to recognize that the article is a product particularly excellent in extensibility and flexibility.

  Furthermore, in another aspect (aspect 10) of the present invention, in the absorbent article according to any one of aspects 5 to 9, the back sheet has a substantially flat structure at least in the second region.

  The absorbent article according to this aspect 10 has a structural element that can be a fold starting point because the back sheet has a substantially flat structure at least in the low extension region in the second region. Therefore, the shape of the main body portion in the second region is more easily maintained, and excretory fluid discharged from the wearer can be more stably absorbed.

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which had the outstanding wearing feeling and high absorption performance can be provided.

FIG. 1 is a plan view of a sanitary napkin 1 according to an embodiment of the present invention as viewed in the thickness direction from the top sheet side. FIG. 2 is a plan view of the sanitary napkin 1 according to an embodiment of the present invention as viewed in the thickness direction from the back sheet side. Figure 3 is an end view of a cross section along the widthwise center axis C _L extending in the longitudinal direction of FIG. 1 in the sanitary napkin 1 according to one embodiment of the present invention. 4 is a cross-sectional view of the sanitary napkin 1 according to the embodiment of the present invention, taken along line IV-IV in FIG. FIG. 5 is a plan view of the absorbent body 22 used in the sanitary napkin 1 according to one embodiment of the present invention in an unstretched state (natural state). FIG. 6 is a plan view showing an elongated state of the absorbent body 22 used in the sanitary napkin 1 according to the embodiment of the present invention. Figure 7 is an end view of a cross section along the widthwise center axis C _L extending in the longitudinal direction of FIG. 1 in the extended state of the sanitary napkin 1 according to one embodiment of the present invention.

  Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In this specification, unless otherwise specified, “an object placed on a horizontal surface in an unfolded state (for example, an absorbent article, a main body, an absorbent body, etc.) from the upper side in the vertical direction. "Looking in the thickness direction" is simply called "plan view".

Various directions and the like used in this specification are as follows unless otherwise specified.
In this specification, “width direction W” refers to “a direction in which the length of a vertically long object in a plan view is short (short direction)”, and “long direction L” refers to “a vertically long object in a plan view” "Thickness direction T" refers to "perpendicular direction with respect to the object placed on the horizontal plane in the unfolded state", and these width direction W, longitudinal direction L and thickness. The length directions T are orthogonal to each other.
Further, in this specification, “in the longitudinal direction L of the absorbent article, when the wearer wears the absorbent article, one side which is relatively proximal to the wearer's abdomen” The front side of the absorbent article ”,“ in the longitudinal direction L of the absorbent article, when the wearer wears the absorbent article, it is relatively distal to the wearer's abdomen (that is, the wearer's back). “The other side which is relatively proximal to the side” is referred to as “the rear side of the absorbent article”.
Further, in this specification, "vertically elongated object (e.g., the absorbent article main body, the absorbent body, etc.) in the width direction W of the relatively near the width direction center axis C _L extending in the longitudinal direction L It refers to place side "and" inner side in the width direction ", in the width direction W of the object of" the vertical, outer relatively distal "and in the" width direction with respect to the widthwise central axis C _L It is called “the side.
In this specification, unless otherwise specified, in the thickness direction T of the absorbent article, “relatively proximal to the skin surface of the wearer when the absorbent article is worn” "Side" and "relative to the skin surface of the wearer when the absorbent article is worn" is referred to as "non-skin side".

FIG. 1 is a plan view of the sanitary napkin 1 according to an embodiment of the present invention in a state where the sanitary napkin 1 is expanded, as viewed in the thickness direction T from the surface sheet side, and FIG. It is the top view seen in thickness direction T from the back sheet side. 1 and 2, the upper side of the drawing corresponds to the front side of the absorbent article, and the lower side of the drawing corresponds to the rear side of the absorbent article.
Further, FIG. 3, the in sanitary napkin 1 is an end view of a cross section along the widthwise center axis C _L extending in the longitudinal direction L of Figure 1, in Figure 4, the sanitary napkin 1, FIG. 1 It is sectional drawing of the cross section along line IV-IV.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present embodiment has a vertically long overall outer shape in the longitudinal direction L in plan view. The outer edge near the front side of the central portion in L has a shape protruding in a substantially trapezoidal shape toward the outer side in the width direction W. Specifically, the sanitary napkin 1 has a longitudinally long main body 2 having a longitudinal direction and a width direction in a plan view, and a front side of a central portion in the longitudinal direction L of the main body 2. In a position close to each other, it is disposed on each of the pair of substantially trapezoidal flap portions 3 and 3 ′ and the pair of flap portions 3 and 3 ′ extending on both sides in the longitudinal direction L of the main body portion 2. A pair of clothes fixing adhesive portions 4, 4 'extending in the longitudinal direction L.

As shown in FIGS. 3 and 4, the main body 2 includes a liquid-permeable surface sheet 21 located on the skin surface side and a liquid-impermeable back surface located on the non-skin surface side in the thickness direction T. The sheet 23, the absorber 22 having a plurality of slit portions S that are positioned between these sheets and extend in the width direction W, a stripe shape that extends in the width direction W on the non-skin surface side surface of the back sheet 23, and the like A clothes fixing adhesive portion (not shown) of the main body portion 2 that is disposed in any form and extends in the longitudinal direction L, and absorbs and holds excretion fluid discharged from the wearer. It is configured to be able to. On the other hand, as shown in FIGS. 1, 2, and 4, the flap portions 3 and 3 ′ are located on the skin surface side in the thickness direction T and extend from the main body portion 2 in the width direction W. Longitudinal direction L arranged on the surface on the non-skin surface side of the top sheet 21, the back sheet 23 located on the non-skin surface side and extending in the width direction W from the main body 2. , And adhesive fixing portions 4 and 4 ′ for fixing clothes.
In addition, when the sanitary napkin 1 is worn, the body portion 2 is placed on the skin surface side of the wearer's clothing by a clothing fixing adhesive portion (not shown) disposed on the non-skin surface side surface of the body portion 2. After being fixed to the surface of each, the pair of flap portions 3 and 3 ′ are folded back to the non-skin surface side of the clothing, respectively, and the adhesive portions 4 disposed on the non-skin surface side surfaces of the respective flap portions 3 and 3 ′, The surface of the pair of flap portions 3, 3 ′ is worn when the sanitary napkin 1 is worn. It becomes the surface opposite to the person's skin surface.

As shown in FIG. 1, the main body 2 has a front edge 5 in the longitudinal direction L that is positioned on the front side (abdomen side) of the wearer when the sanitary napkin 1 is worn, and a physiological When the napkin 1 is worn, the longitudinal edge of the longitudinal side L located on the back side (back side) of the wearer and the longitudinal direction of the adhesive portions 4, 4 'of the pair of flap portions 3, 3' A first imaginary straight line L ₁ including a pair of first end portions 7, 7 ′ located on the proximal side with respect to the front end edge portion 5 among the both end portions 7, 8, 7 ′, 8 ′ the first region a ₁ extending between the front side edge portion 5, the second virtual straight line L ₂ and the first virtual comprising a longitudinal central portion of each of said pair of adhesive portions 4, 4 ' the second region a ₂ which extends between the straight line L _1, 'both end portions 7,8,7 in the longitudinal direction L of' the pair of adhesive portions 4, 4, the rear-side edge portion of the 8 ' 6 A third region A ₃ that extends between the third imaginary straight line L ₃ and the second virtual straight line L ₂ include a pair of second end portions 8, 8 'located proximally against said first 3 and a, a fourth region a ₄ that extends between the virtual straight line L ₃ and the rear side edge portion 6.
In the sanitary napkin 1 according to the present embodiment, as shown in FIG. 1, the front side edge portion 5 and the rear side edge portion 6 of the main body 2 each have a substantially arcuate plan view shape. Each of the above-described areas A _{1 to} A ₄ extends in a band shape or a substantially rectangular shape between the front side edge portion 5 and the rear side edge portion 6.

As shown in FIG. 1, the fourth area A ₄ includes at least an extension area E ₄ that can be extended in the longitudinal direction L, and the second area A ₂ is a plan view of the main body 2. It extends across the widthwise central axis C _L extending in the longitudinal direction L and includes a low extension region N ₂ having a lower extension rate than the extension region E ₄ or non-extension.
Further, the low elongation region N ₂ of the second region A ₂ is 1, 2, and 4, in plan view, longitudinal of the body portion 2 on both sides of the widthwise central axis C _L Two linear recesses P and P ′ extending in the direction L and having a bottom portion with a higher density than other portions are provided.
The absorption body 22 in the present embodiment, as shown in FIGS. 1 to 3 are arranged so as to extend over from the first region A ₁ in the fourth region A _4.

Here, in this specification, “elongation” means 5.0 N in two predetermined directions opposite to each other according to the method described in “6.3 Tensile strength and elongation” of JIS L 1913: 2010. When pulled by force, it stretches 3% or more with respect to the length (100%) of the natural state (that is, the state before stretching) without breaking, ie, the length after stretching is 103% or more. Means to grow).
Further, in this specification, “extendable” means 5.0 N in two predetermined directions opposite to each other according to the method described in “6.3 Tensile strength and elongation” of JIS L 1913: 2010. When pulled by force, it stretches by 3% or more with respect to the length (100%) of the object in the natural state (ie, before elongation) without breaking, ie, the length after tension is 103%. It can be stretched to become above. Therefore, in this specification, the “extension region” (which can be extended at least in the longitudinal direction) means that the target region is elongated in accordance with the method described in “6.3 Tensile strength and elongation” of JIS L 1913: 2010. A region that stretches by 3% or more with respect to the length (100%) of the region in the natural state (ie, the state before stretching) without breaking when pulled in two directions opposite to each other with a force of 5.0 N (That is, a region extending so that the length of the expanded region is 103% or more).
Further, in this specification, the “elongation rate” is 5.0 N in two predetermined directions opposite to each other according to the method described in “6.3 Tensile strength and elongation rate” of JIS L 1913: 2010. When pulled by force, it means the rate of increase (%) of the length of the stretched object (ie, the length after stretching) relative to the length of the natural state (ie, the state before stretching). Can be obtained by the following equation.
Elongation rate (%) = [(length after elongation of object (mm)) − (length of object in natural state (mm))] / (length of object in natural state (mm)) × 100
In this specification, “non-elongation” means 5.0 N in two predetermined directions opposite to each other according to the method described in “6.3 Tensile strength and elongation” of JIS L 1913: 2010. When pulled by force, it means that the material does not stretch 3% or more with respect to the length of the object in the natural state without breaking. Therefore, “non-elongation” means less than 3% with respect to the length of the object in the natural state (100%) in addition to breaking without exceeding 3% with respect to the length of the object in the natural state. It also includes stretching (ie, “minimal stretching” where the length after stretching is less than 103%).
In this specification, the “low extension region” refers to a region having a relatively low extension rate relative to the “extension region”, and the low extension region includes an extension region having a relatively low extension rate. Non-extension regions are also included.

Sanitary napkin 1 according to this embodiment, the fourth region A ₄ which is a region corresponding to the buttocks of the wearer when worn, since it is configured to include an extension area E _4, wearer such as walking When the wearer's buttocks move alternately left and right when the operation is performed, a force is applied in a direction in which the sanitary napkin 1 is twisted about the longitudinal direction L of the sanitary napkin 1 in the rear side region of the sanitary napkin 1. Even so, the extension region E ₄ is deformed not only in the longitudinal direction L that can be stretched but also in a direction twisted around the longitudinal direction L in accordance with the movement of the wearer. ₄ can be maintained in a state in which the fourth region A4 including ₄ is in close contact with the skin surface of the wearer (that is, an excellent wearing feeling can be obtained), and the above-described force in the twisting direction is the extension region. the deformation of the E ₄ Is buffered Te, less likely to be transmitted to correspond to the excretion portion of the wearer (or contact) region (at least a second region A _2).
Furthermore, since the sanitary napkin 1 according to the present embodiment is configured such that the second region A _{2 that} is a region corresponding to (or in contact with) the wearer's excretion opening includes the low-extension region N ₂ . in wearer operations such as the second region a ₂ effect is relatively small due to, easier to maintain the shape of the body part 2 (i.e., the shape of the body portion 2 is difficult to deform), discharged from the wearer The excretory fluid such as menstrual blood can be stably absorbed for a long time.

In the absorbent article of the present invention, it is preferable that the main body portion has an elongation rate in the longitudinal direction L of the above-described elongation region of 10% or more.
When the stretch rate is 10% or more, the stretch region is in a state of being more easily deformed. Therefore, when the wearer performs an action such as walking, the above-described effect of the stretch region, The extension region is deformed not only in the longitudinal direction L that can be extended, but also in the twisting direction described above, in accordance with the movement of the wearer (especially the left and right alternating movement in the buttocks) and the extension of the underwear, etc. The effect that the fourth region including the elongated region can be brought into close contact with the skin surface of the wearer with higher accuracy can be exhibited better and more reliably.
In addition, since the difference with the expansion | extension rate of the underwear (especially shorts) which pastes a sanitary napkin will become small if the above-mentioned elongation rate is high, sanitary napkin is made more with respect to a wearer's movement and movement of underwear. There is also an advantage that it can be easily interlocked, that is, it can be excellent in wearing feeling. In particular, in terms of ease of attachment to shorts and ease of familiarity with shorts, predetermined two directions that conflict with the object according to the method described in “6.3 Tensile Strength and Elongation Ratio” of JIS L 1913: 2010. It is preferable that the film can be stretched by 3% or more when pulled with a force of 0.5 N.

Further, the sanitary napkin 1 according to this embodiment, and other extends in the longitudinal direction L of the main body portion 2 low elongation region N ₂ of the second region A ₂ is on both sides of the widthwise central axis C _L Since there are two linear recesses P and P ′ having a bottom portion with a higher density than that of the portion, the force in the direction in which the sanitary napkin 1 is twisted in the rear region of the sanitary napkin 1 by the wearer's action Or even when a force is applied in the width direction W of the main body 2 by the wearer's buttocks, the region that is the central portion of the region corresponding to the wearer's excretion port (i.e., In the region sandwiched between the two linear recesses P and P ′), the shape of the main body 2 is more easily maintained by the rigidity of the hard linear recesses P and P ′, and is discharged from the wearer. More stable and more excreted fluid such as menstrual blood It can be absorbed in. Further, in a region sandwiched between the two linear recesses P and P ′, an absorbent material to be described later in the main body 2 is partitioned by the two linear recesses P and P ′. Since it is difficult to move from the region, the absorption performance of the main body 2 (particularly, the region corresponding to the wearer's excretion opening) can be exhibited well and stably.

  In the present embodiment, the linear recesses P and P ′ are formed by stacking a top sheet 21, an absorber 22 and a back sheet 23, which constitute the main body 2, in this order, with heating or non-heating embossing. It can be formed by squeezing in the thickness direction T from the surface on the skin side of the topsheet 21 using any pressing means such as processing.

In the present invention, the planar view shape of the linear recess is not particularly limited, and in addition to a shape combining curves as in the above-described embodiment, a linear shape, a broken line shape, a zigzag shape, a geometric shape, a predetermined design Any shape such as a shape can be employed.
Further, in the embodiment described above, the two linear recesses P, P 'is viewed in plane, on either side of the widthwise central axis C _L, wherein along the longitudinal direction L of the main body portion 2 second are disposed symmetrically across from first region a ₁ in the fourth region a _4, in the present invention, as long as the shape of the low elongation region sandwiched by the line-recess described above may be retained, the arrangement form is not particularly limited, for example, the linear recesses may be arranged a total of three or more on either side of the widthwise central axis C _L, along the longitudinal direction L of the main body portion 2, the second 1 from the area a ₁ may be disposed the fourth be disposed across the region a ₄ or over only the second region a ₂ and the third region a _3. When a plurality of such linear recesses that increase the rigidity of the main body are arranged, the shape of the main body is more easily maintained.
Note that the linear concave portion is positioned so as not to overlap with the slit portion of the absorber, which will be described later, in the thickness direction T from the viewpoint of maintaining the shape of the low extension region and ensuring the extensibility of the extension region (ie, overlapping the extension region and the extension region). It is preferable to be arranged at a position that does not become necessary.

Hereinafter, the extension region and the low extension region of the sanitary napkin 1 according to the present embodiment will be described in more detail.
Sanitary napkin 1 according to this embodiment, as shown in FIG. 1, the third region A _3, extending from the low elongation region N ₂ of the second region A ₂ on the rear side of the longitudinal direction L low elongation a region N _3, extension extending from said extension region E ₄ of the low elongation region N ₃ the main body portion 2 in the longitudinal direction L positioned on both sides of and the fourth region a ₄ with respect to the front side in the longitudinal direction L It has an area E _3, and further, the low elongation region N ₃ in the third region a ₃ is the linear recess P of the in the second region a ₂ low elongation region N _2, P ' Are each provided with a plurality of linear recesses extending rearward in the longitudinal direction L.
Such a configuration is not an essential configuration in the absorbent article of the present invention. However, when the low extension region exists from the second region A ₂ to the third region A ₃ as described above, the main body Since it is possible to secure a wider region of the portion 2 that is difficult to deform, the excretory fluid such as menstrual blood discharged from the wearer can be more stably and reliably absorbed. Further, the main body 2, on both sides of the longitudinal direction L of the main body portion 2 with respect to the low elongation region N ₃ of the third region A _3, forwardly extending side of the longitudinal direction L from the fourth region A ₄ because it has an extension region E _3, or has transmitted force is to be twisted from the rear region of the above-described sanitary napkin 1 by the operation of the walking or the like of the wearer, or the body by groins of the wearer in the width direction W of part 2 even if the force is such or applied, it is possible to buffer these forces by deformation of the extension region E ₃ of the third region a _3. Thereby, the sanitary napkin 1 having such a configuration is provided in the width direction central portion of the main body 2 in the second region A ₂ and the third region A ₃ (that is, the low-extension regions N ₂ , N ₃ (particularly, The shape of the low-extension region sandwiched between the two linear recesses P and P ′) is more easily maintained, so that the excretion fluid such as menstrual blood discharged from the wearer can be more stably and reliably obtained. Can be absorbed.

Further, the sanitary napkin 1 according to this embodiment, as shown in FIG. 1, the first region A ₁ extends on the front side in the longitudinal direction L from the low elongation region N ₂ of the second region A ₂ and it is configured to include a low elongation region N _1.
Such an arrangement, although not an essential configuration in an absorbent article of the present invention, when such a low elongation region is present across the first region A ₁ from the second region A _2, the body Since the area where the shape of the portion 2 is easily maintained (that is, difficult to be deformed) can be further secured, the longitudinal direction of the main body portion 2 is relatively less affected by the wearer's movement and underwear elongation. In the area on the front side in the direction L, it is easy to maintain the shape of the main body 2 and absorb the excretion fluid such as menstrual blood discharged from the wearer more stably and more reliably over a long period of time. Can do.

Furthermore, the sanitary napkin 1 according to the present embodiment is configured such that the fourth region A ₄ includes a low extension region N ₄ located between the rear side edge 6 and the extension region E _4. Has been.
Although this configuration is not an essential configuration in the absorbent article of the present invention, the region between the rear side edge portion 6 and the extension region E _{4 in} the fourth region A ₄ is a wearer. impact of such as elongation behavior or underwear is relatively small portion, when such a low elongation region N ₄ in the region is located, excellent strength and absorption properties as a sanitary napkin (absorbent article) Can be secured.

In the present embodiment, each of the extension regions E ₃ and E ₄ of the third region A ₃ and the fourth region A ₄ includes various types constituting the main body 2 as shown in FIGS. By providing a plurality of slit portions S that penetrate the absorber 22 in the thickness direction T and extend substantially linearly in the width direction W in a predetermined region of the absorber 22 that is the thickest member among the members. Is formed. In the absorbent article of the present invention, the extension region is not limited to such an aspect as long as the extension region is configured to be extensible in at least the longitudinal direction L. For example, various members (for example, the main body portion (for example, The predetermined region of the absorber or the like may be made of an extensible material.

As in this embodiment, the absorber 22 constituting the main body portion 2 is, in the third region A ₃ and the fourth region A each extension region E ₃ of _4, the width direction W of the main body portion 2 in E ₄ as having a plurality of slits S extending, when the wearer performs an operation such as walking, the third region a ₃ and each extension region E ₃ of the fourth region a _4, E ₄ is, wearer motion (in particular, the right and left alternating motion at the hips) in accordance with the elongation or the like and underwear, not only stretchable longitudinally L, easily be deformed in a direction in which twists the above, the extension area E _3, The region including E ₄ (in the present embodiment, the third region A ₃ and the fourth region A ₄ ) can be brought into close contact with the skin surface of the wearer more accurately and more reliably.
Furthermore, since the absorbent body 22 occupying most of the thickness of the main body 2 of the sanitary napkin 1 has such a plurality of slit portions S, the absorbent body 22 is superior to the main body 2 as well as the absorbent body 22. Since flexibility (particularly, flexibility in the thickness direction T and width direction W) can be imparted, it is possible to obtain further excellent body compatibility (ie, fit) as a sanitary napkin.

Hereinafter, the absorber 22 provided with the plurality of slit portions S described above will be described in more detail with reference to the drawings.
FIG. 5 is a plan view of the absorbent body 22 used in the sanitary napkin 1 according to this embodiment in a non-expanded state (natural state), and FIG. 6 shows the absorbent body 22 used in the sanitary napkin 1. It is a top view of the expansion | extension state. Further, FIG. 7 is an end view of a cross section along the widthwise center axis C _L extending in the longitudinal direction of FIG. 1 in the extended state of the sanitary napkin 1 according to this embodiment.

In this embodiment, the absorber 22 is not particularly limited except that the plurality of slit portions S described above are formed, and any absorber known in the technical field of absorbent articles can be used. As such an absorbent body, for example, an absorbent material containing water-absorbing fibers such as pulp and / or a superabsorbent polymer is used as a liquid-permeable covering sheet (referred to as a “core wrap sheet”) such as at least one tissue. ).
In the absorbent article of the present invention, the thickness of the absorbent body is not particularly limited, and any thickness considering the type and application of the absorbent article, the type of wearer, and the like can be adopted. Such thickness includes, for example, a thickness in the range of 0.1 mm to 10 mm, but in the range of 0.3 mm to 3 mm from the viewpoint of thinning, flexibility, fit, etc. of the absorbent article. Thickness is preferred.

As shown in FIG. 5, in the absorbent body 22 in this embodiment, the plurality of slit portions S are in plan view, and the slit portions S adjacent to the longitudinal direction L of the main body portion 2 are in the longitudinal direction L. Arranged so as to partially overlap (in other words, the plurality of slit portions S are completely separated in the longitudinal direction L from the slit portions S adjacent to the longitudinal direction L of the main body portion 2 in plan view). Are arranged so as not to overlap). Said extension when multiple slits S are arranged in this manner in the region E _3, E _4, wherein said extension region E _3, E ₄ in the sanitary napkin 1 in the longitudinal direction L and above by the operation or the like of the wearer When deformed in the twisting direction, the absorber 22 is torn in the slit portion S, and the absorber 22 is less likely to be broken in the longitudinal direction L. Further, in the absorbent body 22, the portion where the slit portion S does not exist can exhibit a predetermined absorption performance, and therefore the plurality of slit portions S are arranged as described above in the extension regions E ₃ and E ₄ . When is the portion capable of exhibiting a predetermined absorption performance does not unevenly distributed in the extension region E _3, E _4, it is possible to exert a predetermined absorption performance even in the extended area E _3, E ₄ .
Therefore, the sanitary napkin 1 having the above configuration, it is possible to more reliably exhibit the above-described operational effects are achieved by the extension region E _3, E _4, absorption in the extension region E _3, E ₄ The performance can be exhibited stably.

Further, a plurality of slits S in the absorber 22, as shown in FIG. 5, the slit portions S of the predetermined number are present in the extension region E _3, E _4, a plurality of slits existing area A _S, It said extension region E _3, are arranged to have a slit portion absence regions a _N where slits S are not present, the in E _4, further wherein the slit portion absence regions a _N is in plan view, A first non-existing region A _N1 extending from one end (one end on the left side in FIG. 5) in the width direction W of the absorber 22 toward the other side (one end on the right side in FIG. 5) toward the front side (the upper side in FIG. 5). And the rear side (FIG. 5) from one end (one end on the left side in FIG. 5) to the other end (one end on the right side in FIG. 5) that intersects the first non-existing region _{AN1 in} the width direction W of the absorber 22. Second side extending downward) Is composed from the presence area A _N2 Prefecture, the slit portion existing area A _S, the area surrounded by the first non-existing region A _N1 and the second non-existing region A _N2, or the first non-existence are present in surrounded by an area a _N1 the second non-existing region a _N2 to the longitudinal direction L widthwise end extending to the edge e _1, e ₂ of the absorbent body 22 region.

In the extended area E _3, E _4, the absorber 22 is that it has a slit portion absence regions A _N extending above specific two directions, intensity and absorption in the absorber even in the extended area E _3, E ₄ while ensuring a sufficient performance, further, to have a slit portion existing area a _S surrounded by the slit portion absence regions a _N, as shown in FIGS. 6 and 7, the absorbent body 22, the overall Can be extended in the longitudinal direction L evenly and with a longer extension range, so that even when the wearer's movement or the like is large, the non-extension of the main body 2 while maintaining good absorption performance Regions N _{1 to} N ₃ can be more closely attached to the skin surface of the wearer.

In the absorbent article of the present invention, the arrangement mode of the plurality of slit portions is not limited to the mode of the above-described embodiment as long as the extension region of the main body portion can be extended in the longitudinal direction L. For example, The plurality of slit portions may be disposed in each of the regions surrounded by the slit portion non-existing regions provided in a grid pattern in which the slit portion existing regions where a predetermined number of slit portions are present A plurality of stripe-shaped slit part non-existing areas provided in the direction L or the width direction W may be arranged in each of the areas sandwiched between the slit part non-existing areas.
Further, the plurality of slit portions may be arranged with a predetermined pattern over the entire extension region, and when such an arrangement is adopted, the plurality of slit portions are arranged in the width direction of the absorber. It is preferable to arrange them so that they do not line up along the entire length of W. By arranging the plurality of slit portions in this manner, it is possible to prevent the plurality of slit portions arranged in a straight line from acting like a perforation line and tearing the absorber.

  Further, in the sanitary napkin 1 of the present embodiment, the slit portion S is formed as a substantially linear through hole extending in the width direction W in plan view as shown in FIG. In an absorbent article, it is not limited to such an aspect, The slit part may have arbitrary planar view shapes within the range which does not impair the effect of this invention. Examples of the shape of the slit portion in plan view include arc shapes, V shapes, waveforms, zigzag shapes, and the like.

In the sanitary napkin 1 of the present embodiment, the length of the slit portion S extending in the width direction W of the main body portion 2 (that is, the length in the width direction of the slit portion) is at least in the longitudinal direction of the extension region of the main body portion 2. Although it does not restrict | limit as long as it can extend | stretch to L, Preferably it exists in the range of 3 mm-50 mm, More preferably, it exists in the range of 5 mm-15 mm. When the length of the slit portion S is 3 mm or more, the extension regions E ₃ and E ₄ of the main body portion 2 can be sufficiently extended in the longitudinal direction L, and the extension regions E ₃ and E of the main body portion 2 are expanded. ₄ can be further easily deformed in a direction twisted about the longitudinal direction L, and further, moderate flexibility can be imparted to the absorber 22 or the main body 2. Moreover, when the length of the slit part S is 50 mm or less, when the absorber 22 receives a force from the outside in the width direction W, the slit part S opens and tears. It is difficult to occur and good durability as an absorbent article can be secured.

  In the present invention, means for forming the plurality of slit portions in the absorber is not particularly limited, and any cutting means can be adopted. For example, an absorber having a plurality of slit portions is formed by a rotating cutting roll on the upper surface of the precursor while conveying the precursor of the absorber manufactured by an arbitrary manufacturing method by a conveying means such as a belt conveyor. It can manufacture by pressing and penetrating the some cutting blade provided on the surrounding surface. In addition, a several slit part can be formed in an absorber with a predetermined arrangement | positioning form by adjusting arrangement | positioning of the cutting blade of a cutting roll suitably.

Next, in the sanitary napkin 1 according to the present embodiment, the pair of substantially trapezoidal flap portions 3 and 3 ′ extending on both sides in the longitudinal direction L of the main body portion 2 will be described in more detail.
As described above, the pair of flap portions 3, 3 ′ includes the top sheet 21 extending from the main body portion 2 in the width direction W and the back sheet 23 extending from the main body portion 2 in the width direction W. As shown in FIGS. 1, 2, and 4, the surface on the non-skin surface side of each of the flap portions 3, 3 ′ (that is, the non-skin surface side surface of the back sheet 23) , Adhesive portions 4 and 4 ′ for fixing clothes that are substantially rectangular and extending in the longitudinal direction L are provided.
And in the sanitary napkin 1 which concerns on this embodiment, it is in the said front side edge part 5 among the both ends 7, 8, 7 ', and 8' in the longitudinal direction L of this pair of adhesion parts 4 and 4 '. A first imaginary straight line L ₁ including a pair of first ends 7, 7 ′ located on the proximal side, and a pair of second ends located on the proximal side with respect to the rear end edge 6. The second area A ₂ and the third area A ₃ extending between the third virtual straight line L ₃ including 8 and 8 ′ correspond to (or come into contact with) a wearer's excretion opening; It is comprised so that it may become.
Therefore, in the absorbent article of the present invention, the pair of adhesive portions in the flap part is an arbitrary dimension and shape in consideration of the type and use of the absorbent article, the type of the person to be worn, the fixation to clothes, etc. It arrange | positions on the surface by the side of the non-skin surface of a flap part. In the case of the sanitary napkin 1 according to the above-described embodiment, the pair of adhesive portions 4, 4 ′ in the flap portions 3, 3 ′ has a length in the longitudinal direction L in the range of 10 mm to 150 mm, for example, the width direction W Is disposed on the non-skin-surface side surface of each of the flap portions 3 and 3 ′ in a form having a substantially rectangular plan view shape having a length of 5 mm to 50 mm.

  In the absorbent article of the present invention, the pressure-sensitive adhesive forming the clothes fixing pressure-sensitive adhesive part is not particularly limited, and for example, any pressure-sensitive adhesive containing a styrene-based polymer or the like can be used.

  Moreover, in the sanitary napkin 1 according to the present embodiment, the pair of flap portions 3, 3 ′ extends in the width direction W from the main body portion 2 in plan view, as shown in FIGS. 1 and 4. It has a pair of substantially trapezoidal plan-view shapes formed by the top sheet 21 and the back sheet 23 extending from the main body 2 in the width direction W. The absorptivity of the present invention In the article, the form of the pair of flap portions is not limited to such a form. For example, the pair of flap portions has a shape in plan view other than the substantially trapezoidal shape (for example, rectangular shape, semi-ellipse). Or a predetermined design shape, etc., and is constituted by a sheet-like member different from the main body (that is, a sheet-like member different from the front sheet and the back sheet constituting the main body). It may be.

  Hereinafter, in the sanitary napkin 1 according to the present embodiment, the top sheet 21 and the back sheet 23 constituting the main body 2 and the pair of flaps 3 and 3 ′ will be described in more detail.

In the sanitary napkin 1 according to the present embodiment, as shown in FIGS. 1, 3, and 4, the topsheet 21 has a longitudinal length of the sanitary napkin 1 on the skin surface side in the thickness direction T of the sanitary napkin 1. be arranged in the width direction central axis on the C _L extending in the direction L, it is formed by direct contact with may liquid-permeable sheet member to the skin surface of the wearer. The liquid-permeable sheet member that constitutes the surface sheet 21 is not particularly limited, and may be any arbitrary one such as an air-through non-woven fabric formed using cellulose fibers or thermoplastic resin fibers subjected to hydrophilic treatment. A nonwoven fabric or the like can be suitably used.

Especially, it is preferable to use the nonwoven fabric comprised so that the area | region corresponding to the expansion | extension area | region of the said main-body part can be extended | stretched at least to the longitudinal direction L as a sheet | seat member used as a surface sheet of the absorbent article of this invention. As such a nonwoven fabric, for example, a nonwoven fabric composed of elastic fibers in which a region corresponding to the extension region of the main body portion can be extended, or a stretchable concavo-convex structure in which a region corresponding to the extension region of the main body portion will be described later The nonwoven fabric comprised by these is mentioned.
By using such a non-woven fabric for the topsheet, the extension region of the main body is more easily deformed in accordance with the wearer's movement. Therefore, a region including the extension region (in this embodiment, the third region While the region A ₃ and the fourth region A ₄ ) can be more reliably realized in a state where the region A ₃ and the fourth region A ₄ ) are in close contact with the skin surface of the wearer, the force in the twisting direction applied to the rear region of the absorbent article is It becomes more difficult to transmit to the region (at least the second region) corresponding to (or in contact with) the wearer's excretion opening.

  Moreover, in the absorbent article of the present invention, the top sheet has higher extensibility than the back sheet described later (that is, it can be extended with a smaller force than the back sheet). It is preferable. When the topsheet has higher extensibility than the backsheet, the topsheet is more easily contracted than the backsheet when shrinking after stretching deformation, so the absorbent article is the surface on the topsheet side. It is easy to deform | transform into the structure (what is called a cup-shaped structure) which became depressed, and it becomes easy to follow a wearer's body shape and the shape of underwear (especially shorts).

  In the absorbent article of the present invention, the size and shape of the topsheet is particularly suitable if it can cover the entire surface of the skin surface side of the absorbent body disposed on the non-skin surface side of the topsheet. There is no limitation, and any size and shape can be adopted according to the size, sex, usage, etc. of the person wearing the absorbent article. Furthermore, the thickness of the surface sheet is not particularly limited, and for example, a thickness in the range of 0.001 mm to 5.0 mm can be adopted, but from the viewpoint of liquid permeability, cushioning properties, touch, etc. Is in the range of 0.01 mm to 3.0 mm, more preferably in the range of 0.1 mm to 1.0 mm.

  In the absorbent article of the present invention, the structure of the surface sheet is not particularly limited. For example, both the skin surface side and the non-skin surface side may have a substantially flat structure. It is preferable that the region corresponding to the extended region of the main body has an extendable concavo-convex structure. As such an extendable concavo-convex structure, for example, in a plan view, a plurality of linear ridges extending in the width direction W of the surface sheet and arranged in the longitudinal direction L at predetermined intervals, and adjacent ridges The cross-sectional shape along the longitudinal direction L, which is formed by a plurality of linear concave grooves that are located between the portions and extend in the width direction W of the topsheet, is substantially wave-shaped (that is, An uneven structure in which the inside is hollow) is exemplified. Here, in the thickness direction T of the surface sheet, the ridge portion has a structure in which a surface on the skin surface side of the surface sheet protrudes toward the skin surface side, and the groove portion is a thickness of the surface sheet. In the thickness direction T, the surface of the surface sheet has a structure in which the surface on the skin surface side is recessed toward the non-skin surface side.

When the nonwoven fabric having such a stretchable concavo-convex structure is used for the surface sheet of the absorbent article, the stretched region of the main body portion is more easily deformed in accordance with the movement of the wearer, and therefore includes the stretched region. region (in this embodiment, the third region a ₃ and the fourth region a ₄₎ a state in which the close contact with the skin surface of the wearer, can be achieved more reliably (i.e., the wearing feeling of the absorbent article Further, the above-described twisting force applied to the rear region of the absorbent article can be further transmitted to the region corresponding to (or in contact with) the wearer's excretion opening (at least the second region). It becomes difficult to be done.

Further, in the above-described stretchable concavo-convex structure, the height of the ridge portion (that is, the distance between the horizontal plane including the top of the ridge and the horizontal plane including the bottom of the groove) is not particularly limited. , A height in the range of 0.1 mm to 1.2 mm can be employed, but from the viewpoint of extensibility, touch, cushioning properties, etc., preferably in the range of 0.2 mm to 1.0 mm, and Preferably it exists in the range of 0.4 mm-0.8 mm.
The height of the ridges is non-contact using a laser displacement meter (for example, a high precision two-dimensional laser displacement meter LJ-G series (model: LJ-G030) manufactured by Keyence Corporation) as follows. It can be measured by the method. A sample of the surface sheet cut out to a size of 100 mm × 100 mm was placed on a horizontal measurement table, and the displacement from the measurement table was measured with a laser displacement meter for five different ridges. Let the average value be the thickness (mm) of the ridges. Similarly, about five different grooved parts, the displacement from a measurement stand is measured with a laser displacement meter, and let the average value of five measured values be the thickness (mm) of a grooved part. From the difference between the thickness (mm) of the ridge and the thickness (mm) of the groove, the height (mm) of the ridge is calculated.

Further, the pitch of the above-described stretchable concavo-convex structure (that is, the distance (mm) between the top centers (ridge lines) of two adjacent ridges) is not particularly limited, and is, for example, 0.5 mm to 5 A pitch in the range of 0.0 mm can be employed, but from the viewpoint of extensibility and touch, it is preferably in the range of 1.0 mm to 4.0 mm.
The pitch of the concavo-convex structure is measured as the distance (mm) between the top centers (ridge lines) of two adjacent ridges based on a planar photograph or a planar image of the topsheet in a non-pressurized state. Can do.

In the absorbent article of the present invention, the stretchable concavo-convex structure that can be adopted as the structure of the topsheet is not limited to the above-described aspect. For example, the ridges and the groove portions of the above-described concavo-convex structure can be seen in plan view. A mode that partially extends in a direction other than the width direction W of the absorbent article (for example, a direction inclined by a predetermined angle from the width direction W of the absorbent article), or at least partly changing the direction (for example, , Wavy, zigzag, etc.) extending aspect, at least partially discontinuous (ie, intermittent) extending in the width direction W of the absorbent article, at least partially adjacent two ridges An aspect in which the interval between the parts is not constant, an aspect configured by a plurality of convex portions (ridges) as disclosed in Japanese Patent No. 5829349 and Japanese Patent No. 5829326, and a groove portion having a plurality of concave portions, Or this It can be of any combination of embodiments of two or more aspects of the embodiments.
In this way, by appropriately setting the extending direction and form of the ridges and grooves, it is possible to arbitrarily adjust the deformation mode of the extension region in the main body, and various behavior patterns of the wearer It is possible to realize product design corresponding to.

  The method for forming the stretchable concavo-convex structure as described above on the top sheet is not particularly limited. For example, a concavo-convex structure having a corrugated cross-sectional shape is formed by continuously blowing gas (usually air) onto the fiber web. Arbitrary methods such as a method of performing, a method of utilizing vacuum forming, a method of utilizing gear stretching, a method of utilizing thermal expansion of heat-extensible fibers and / or heat contraction of heat-shrinkable fibers can be employed. .

In the sanitary napkin 1 according to the present embodiment, as shown in FIGS. 1 to 4, the back sheet 23 is formed in the longitudinal direction L of the sanitary napkin 1 on the non-skin surface side in the thickness direction T of the sanitary napkin 1. be arranged in the width direction central axis on the C _L extending, it is formed by liquid-impermeable sheet member to prevent leakage of liquid waste such as menstrual blood discharged from the wearer. The liquid-impermeable sheet member constituting the back sheet 23 is not particularly limited. For example, a resin film such as polyethylene or polypropylene having air permeability, a laminate in which a nonwoven fabric is bonded to the resin film, or the like. It can be used suitably.

Among them, the sheet member used as the back sheet of the absorbent article of the present invention is a liquid-impermeable sheet member configured such that an area corresponding to the extension area of the main body can be extended at least in the longitudinal direction L. Is preferably used. As such a sheet member, for example, a sheet member made of an elastic material in which at least a region corresponding to the extension region of the main body can be extended, or a region corresponding to the extension region of the main body can be extended as described later. Examples thereof include a sheet member constituted by a simple bellows structure.
By using such a sheet member for the back sheet, the above-described expandable configuration (such as an accordion structure) while securing leakage resistance against the wearer's excretion liquid by the liquid impermeability characteristic of the sheet member. Since the extension region of the main body is more easily deformed in accordance with the movement of the wearer, the region including the extension region (in the present embodiment, the third region A ₃ and the fourth region A ₄ ) is the wearer. The above-mentioned twisted direction applied to the rear region of the absorbent article can be more reliably realized (that can further improve the wearing feeling of the absorbent article). Is more difficult to be transmitted to the region (at least the second region) corresponding to (or in contact with) the wearer's excretion opening.

  In the absorbent article of the present invention, the size and shape of the back sheet is not particularly limited as long as it can prevent the excretion fluid discharged from the wearer from leaking. Arbitrary dimensions and shapes can be adopted depending on the size, sex, application and the like. Further, the thickness of the back sheet is not particularly limited, and for example, a thickness in the range of 0.001 mm to 5.0 mm can be adopted, but from the viewpoint of liquid impermeability, flexibility, air permeability, and the like. , Preferably in the range of 0.003 mm to 3.0 mm, more preferably in the range of 0.01 mm to 1.0 mm.

  In the absorbent article of the present invention, the structure of the back sheet is not particularly limited. For example, both the skin surface side and the non-skin surface side may have a substantially flat structure. Like the back sheet 23 of the sanitary napkin 1 according to the present embodiment shown in FIGS. 2 and 3, the sheet has a bellows structure extending in the longitudinal direction L of the main body in the extension region of the main body. It is preferable.

In the sanitary napkin 1 according to this embodiment, the bellows structure B formed on the back sheet 23 extends in the width direction W of the back sheet 23 in plan view, as shown in FIGS. 2 and 3. In addition, a plurality of linear grooves B ₁ arranged in the longitudinal direction L at predetermined intervals and a plurality of linear grooves B located between the adjacent protrusions B ₁ and extending in the width direction W of the back sheet 23. ₂ and the cross-sectional shape along the longitudinal direction L is a substantially zigzag shape. Here, in the thickness direction T of the back sheet 23, the convex part B ₁ has a structure in which the skin side surface of the back sheet 23 protrudes to the skin side, and the groove B ₂ In the thickness direction T of the back sheet 23, the skin side surface of the back sheet 23 has a structure that is recessed toward the non-skin side.

Thus, when the liquid-impermeable back sheet 23 has the bellows structure B in the extension region of the main body 2, the leak-proof property against the excretion fluid of the wearer due to the liquid-impermeable characteristic of the back sheet 23. The stretchable bellows structure B can ensure the stretchability of the stretched region of the main body 2 in the longitudinal direction more reliably, so that the region including the stretched region (in this embodiment, the third region The state in which the region A ₃ and the fourth region A ₄ ) are in close contact with the wearer's skin surface can be more reliably realized (that is, the wearing feeling of the absorbent article can be further reliably improved). Further, the above-described twisting force applied to the rear region of the absorbent article is more difficult to be transmitted to the region corresponding to (or in contact with) the wearer's excretion opening (at least the second region).

In addition, as described above, in the case of the present embodiment in which a plurality of slit portions S are formed in the absorbent body 22, the excretory fluid such as menstrual blood discharged from the wearer is normally removed from the slit portions S. However, if the above-described bellows structure B is formed on the backsheet 23, the excretory fluid that has reached the backsheet 23 extends in the width direction W of the bellows structure B. it can diffuse in the width direction W along the groove B _2. Thereby, even if the excretion liquid discharged | emitted from the wearer reaches | attains the back surface sheet 23 via the said slit part S, the said excretion liquid is diffused in the width direction W in the said back surface sheet 23, and the said absorber 22 It can be absorbed from a wide area on the non-skin side surface.

In addition, when the back sheet of the absorbent article has the bellows structure as described above, in the thickness direction T of the absorbent article, flexibility, cushioning properties, and the like can be imparted. The feeling of wearing can be further improved.
Furthermore, when the back sheet has a bellows structure in the extension region of the main body, it is easy to visually recognize that the region is an extendable portion. There is also an advantage that it is easy to recognize that the absorbent article is a product particularly excellent in extensibility, fit, flexibility and the like.

In the above bellows structure, the height of the convex portion (that is, the distance between the horizontal plane including the top of the convex portion and the horizontal plane including the bottom (deepest portion) of the groove) is not particularly limited, and is, for example, 0.1 mm. Although a height in the range of -1.2 mm can be adopted, from the viewpoints of extensibility, cushioning properties, liquid diffusibility, etc., it is preferably in the range of 0.2 mm-1.0 mm, and more preferably Is in the range of 0.4 mm to 0.8 mm.
In addition, the height of the said convex part can be measured similarly to the height of the convex strip part of the extendable uneven structure in the above-mentioned surface sheet.

Further, the pitch of the bellows structure described above (that is, the interval (mm) between the top centers (ridge lines) of two adjacent convex portions) is not particularly limited, and is, for example, in the range of 0.5 mm to 5.0 mm. The inner pitch can be employed, but is preferably in the range of 1.0 mm to 4.0 mm from the viewpoints of extensibility, cushioning properties, liquid diffusibility, and the like.
The pitch of the bellows structure can be measured as a distance (mm) between the top centers (ridge lines) of two adjacent convex portions based on a planar photograph or planar image of the back sheet in a non-pressurized state. it can.

In the absorbent article of the present invention, the bellows structure that can be adopted as the structure of the back sheet is not limited to the above-described aspect. For example, the convex portion and the groove portion of the bellows structure described above are at least partially in plan view. An aspect extending in a direction other than the width direction W of the absorbent article (for example, a direction inclined by a predetermined angle from the width direction W of the absorbent article), or at least partially changing the direction (for example, wavy or zigzag) An extended aspect, an aspect that extends at least partially in the width direction W of the absorbent article (that is, intermittently), and an interval between at least two adjacent protrusions is constant. A mode that is not, or a mode in which two or more modes are arbitrarily combined.
In this way, by appropriately setting the extending direction and form of the convex part and the groove part, it is possible to arbitrarily adjust the deformation mode of the extension region in the main body part, corresponding to various behavior patterns of the wearer. Product design can be realized.

  The method for forming the above bellows structure on the back sheet is not particularly limited, and for example, any method such as a method using vacuum forming or a method using gear stretching can be adopted.

Moreover, in the absorbent article of the present invention, the structure in the low elongation region of the back sheet is not particularly limited, but the back sheet is the back sheet of the sanitary napkin 1 according to the present embodiment shown in FIGS. 2 and 3. 23, it is preferable that both the skin surface side and the non-skin surface side have a substantially flat structure in the low extension region of the main body.
The back sheet has a substantially flat structure (that is, does not have a structural element that can be a fold starting point) in the low extension region of the main body (particularly, at least the low extension region in the second region). ) And the shape of the main body in the low extension region can be more easily maintained, so that the excretory fluid discharged from the wearer can be more stably absorbed.

  In the sanitary napkin 1 according to the present embodiment, the top sheet 21 and the back sheet 23 described above have the outer peripheral edge of each sheet with an adhesive, heat seal, They are joined together by any joining means such as ultrasonic joining.

In this invention, the structure of an absorbent article is not limited to the above-mentioned embodiment, For example, for diffusing excretion liquid between a surface sheet and an absorber and / or between an absorber and a back sheet. An auxiliary sheet or the like may be provided.
As described above, the absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately combined and changed without departing from the object and spirit of the present invention.

  In addition to the sanitary napkin of the above-described embodiment, the present invention can be applied to various absorbent articles such as a panty liner and a (light) incontinence pad. In this specification, ordinal numbers such as “first” and “second” are used to distinguish items with the ordinal numbers, and mean the order, priority, importance, etc. of each item. Not what you want.

1 Sanitary napkin (absorbent article)
2 Body part 21 Top sheet 22 Absorber 23 Back sheet 3, 3 'Flap part 4, 4' Adhesive part 5 Front side edge part 6 Back side edge part

Claims (9)

A longitudinal main body having a longitudinal direction and a width direction, a pair of flaps extending to one side and the other side in the width direction of the main body, and a longitudinal direction disposed in each of the pair of flaps An absorbent article comprising a pair of extending clothes-fixing adhesive portions,
The main body is
A longitudinal front edge located on the wearer's front side when the absorbent article is worn; and
A longitudinal rear edge located on the wearer's rear side when wearing the absorbent article; and
A first imaginary straight line and a front side end including a pair of first ends located on the proximal side with respect to the front side edge portion of both ends in the longitudinal direction of the pair of adhesive portions in plan view A first region extending between the edges,
A second region extending between the second imaginary straight line including the longitudinal central portion of each of the pair of adhesive portions and the first imaginary straight line;
Between the third imaginary straight line and the second imaginary straight line including a pair of second end portions located on the proximal side with respect to the rear side edge portion of both ends in the longitudinal direction of the pair of adhesive portions. A third region extending;
A fourth region extending between the third imaginary straight line and the rear side edge,
The fourth region includes an elongated region that is at least longitudinally extensible,
The second region extends across the central axis in the width direction extending in the longitudinal direction of the main body in a plan view and has a lower longitudinal elongation rate than the elongated region or is not elongated in the longitudinal direction. Including a low elongation region,
Furthermore, the low extension region includes a plurality of linear recesses extending in the longitudinal direction of the main body at least on both sides of the central axis in the width direction in a plan view and having a bottom portion having a higher density than other portions. ,
The third region is located on one side and the other side in the width direction of the main body with respect to the low extension region extending from the low extension region of the second region, and the fourth region. An extension region extending from the extension region, and the low extension region in the third region is a plurality of linear shapes extending from each of the plurality of linear recesses of the low extension region in the second region. Having a recess,
The absorbent article.   The absorptive article according to claim 1 in which said 1st field contains a low extension field prolonged from said low extension field of said 2nd field.   The absorptive article according to claim 1 or 2 in which said 4th field contains said low extension field located between said back side edge and said extension field.   The main body is positioned between each of the sheets, a liquid-permeable top sheet positioned on the skin surface side in the thickness direction, a liquid-impermeable back sheet positioned on the non-skin surface side in the thickness direction. And an absorber extending from the first region to the fourth region, and the absorber has a plurality of slit portions extending in the width direction of the main body portion in the extension region. The absorbent article as described in any one of 1-3.   5. The absorbent article according to claim 4, wherein the plurality of slit portions are arranged so that slit portions adjacent to each other in the longitudinal direction of the main body portion partially overlap in the longitudinal direction in plan view.   The absorber has, in the elongated region, a slit portion existing region where the plurality of slit portions exist, and a slit portion non-existing region where no slit portion exists, and the slit portion non-existing region includes: A first non-existing region extending forward from one end in the width direction of the absorber toward the other end in a plan view, and the other from one end in the width direction of the absorber crossing the first non-existing region A second non-existing region extending rearward toward the end, and the slit part existing region is present in a region surrounded by the first non-existing region and the second non-existing region, The absorbent article according to claim 4 or 5.   The top sheet is located between the plurality of linear ridges extending in the width direction and arranged at predetermined intervals in the longitudinal direction and adjacent ridges in the extension region and in the width direction. The absorptive article according to any one of claims 4 to 6 which has an extendable concavo-convex structure constituted by a plurality of linear ditch parts which extend.   The absorptive article according to any one of claims 4 to 7 in which said back sheet has a bellows structure extended in a longitudinal direction of said body part in said extension field.   The absorbent article according to any one of claims 4 to 8, wherein the back sheet has a substantially flat structure at least in the second region.

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