CN112839616B - Absorbent article - Google Patents

Abstract

Provided is an absorbent article which can improve the touch feeling of the skin and can improve the absorption performance. In an absorbent article (1), a front sheet (2), an auxiliary sheet (5), an absorber (4), a back sheet (3), and a fixing section (7) are stacked in this order in the thickness direction. The dimension of the surface sheet in the width direction is smaller than the dimension of the auxiliary sheet in the width direction. The front sheet has a central region (CA) located at the center in the width direction and a pair of end regions (EA, EA) adjacent to both sides in the width direction of the central region. The central region is joined to the auxiliary sheet, and at least part of the pair of end regions is not joined to the auxiliary sheet. The center region of the front sheet has a plurality of holes (15).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

An absorbent article having an opening in a topsheet in order to efficiently absorb liquid excreta is known. For example, patent document 1 discloses an absorbent article having a surface sheet comprising: a plurality of elastic members applied to the surface sheet in a state of being elongated in the longitudinal direction and arranged with an interval in the transverse direction; and a plurality of notch rows provided between the adjacent elastic members. Each notch row includes a plurality of notch portions provided at intervals in the longitudinal direction, and the surface sheet is contracted in the longitudinal direction by the contraction force of the elastic member to deform the surface sheet to form a concave-convex structure, and the notch portions are opened to form a plurality of openings.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2009-45334

Disclosure of Invention

Problems to be solved by the invention

The absorbent article of patent document 1 has a structure in which the notch portions of the notch rows are opened by contraction of the elastic member near the notch rows during use to form a plurality of openings. Therefore, the notched portion opens or closes with the movement of the user's body, and thus the opening portion is unstable. Under the influence of such unstable fluctuation of the opening, irritation such as friction may occur to the skin, and the skin feel may be reduced. Further, when the technique of patent document 1 is applied to an absorbent article that is fixed to underwear by a fixing portion such as an adhesive and used in close contact with the skin at the time of use, the elastic member is less likely to contract. Therefore, the openings of the notch portions are less likely to open, and it is less likely that liquid excrement is drawn into the absorbent body, which may result in a decrease in absorption performance.

The purpose of the present invention is to provide an absorbent article that can improve the skin feel and at the same time improve the absorption performance.

Means for solving the problems

The absorbent article of the present invention is as follows. (1) An absorbent article having a longitudinal direction, a width direction, and a thickness direction, wherein a front sheet, an auxiliary sheet, an absorber, a back sheet, and a fixing portion are stacked in this order in the thickness direction, wherein the dimension in the width direction of the front sheet is smaller than the dimension in the width direction of the auxiliary sheet, the front sheet has a central region located at the center in the width direction and a pair of end regions adjacent to both outer sides in the width direction of the central region, the central region is joined to the auxiliary sheet, at least a part of the pair of end regions is not joined to the auxiliary sheet, and the central region of the front sheet has a plurality of holes.

The absorbent article has a plurality of holes that are not opened and closed by the movement of the user's body, but are initially opened. The hole means a depressed portion or a portion penetrating to the opposite side in the surface sheet, and includes a depression and a through hole formed by compression. Such a hole can suppress the variation in shape of the user's body regardless of the movement of the body. This allows the liquid excrement to be efficiently absorbed through the hole portion, and also allows the skin feel to be improved by reducing irritation such as friction on the skin around the hole portion. Further, at this time, since the auxiliary sheet has a shape larger than the surface sheet in the width direction, both end edges of the auxiliary sheet are located outside both end edges of the surface sheet. Thus, when the absorbent article is used, the auxiliary sheet can be compressed inward and deformed so as to rise upward (in the direction of the excretion portion) by bringing the both end edges of the auxiliary sheet into contact with the thighs before the both end edges of the front sheet in the width direction. Thus, the pair of end regions placed on the auxiliary sheet without being joined to the auxiliary sheet can be deformed to rise further upward (in the direction of the drain opening), and can function like the pair of wall portions. This can prevent the liquid excrement from spreading outward in the width direction W and reaching the pair of end regions. That is, contact of the liquid excrement with the skin of the user can be reduced, and the burden on the skin of the user can be reduced. In this way, in the absorbent article, the skin feel can be improved and the absorption performance can be improved.

The absorbent article of the present invention may be (2) the absorbent article according to the above (1), wherein the central region and the pair of end regions of the top sheet have a plurality of pores, and an area of each of the pores present in the pair of end regions is smaller than an area of each of the pores present in the central region in a plan view.

In the absorbent article of the present invention, the surface area of each pore in the pair of end regions present on both sides of the topsheet is relatively small in a plan view. Therefore, in a plan view, the uneven shape formed by the presence or absence of the plurality of pores can be made smaller at the end edges in the width direction of each of the pair of end regions. This reduces the friction stimulation on the skin of the user due to the uneven shape of the edge of the topsheet, and improves the tactile sensation of the skin. In addition, the area of each pore existing in the central region of the front sheet is relatively large in a plan view. Therefore, the liquid excrement can be rapidly transferred from the plurality of pores of the top sheet to the absorbent body through the auxiliary sheet, and the absorption performance can be improved. Therefore, the absorbent article of the present invention can improve the tactile sensation of the skin and improve the absorption performance.

The absorbent article of the present invention may be (3) the absorbent article according to the above (2), wherein, in the topsheet, the area of the pores in the central region and the pair of end regions is 0.01mm in a plan view ² Above and 25mm ² The following.

In the absorbent article, the surface sheet has pores with an area of 0.01mm ² This can increase the effect of passing liquid excreta, and can improve the absorption performance. In addition, the area of the fine holes is 1mm ² As a result, the uneven shape formed by the presence or absence of the pores can be suppressed from becoming excessively large, and the frictional irritation to the skin of the user can be reduced, thereby improving the tactile sensation to the skin.

An absorbent article of the present invention may be (4) the absorbent article according to the above (2) or (3), wherein a shape of the pores present in the pair of end regions is a shape in which a dimension in the width direction is shorter than a dimension in the longitudinal direction in a plan view.

In the present absorbent article, the pores in the end regions of the top sheet have a shape that is long in the longitudinal direction. Therefore, the number of partially missing pores present at the end edge in the width direction of the top sheet in a plan view can be reduced, and the degree of irregularities in the width direction formed by the partially missing pores at the end can be reduced. Thus, when the pair of end regions of the topsheet is raised toward the skin side, the frictional irritation of the topsheet to the skin of the user can be reduced, and the skin feel can be improved.

The absorbent article of the present invention may be (5) the absorbent article according to any one of (1) to (4), wherein the top sheet is formed of a nonwoven fabric, and fibers present in the end regions are oriented in the longitudinal direction of the fibers constituting the nonwoven fabric more than fibers present in the central region.

In the absorbent article of the present invention, the fibers in the central region of the topsheet formed of a nonwoven fabric are relatively randomly oriented, and therefore the liquid excreta excreted into the central region can be diffused substantially concentrically without leakage. Further, the fiber orientations of the end regions on both sides are oriented in the longitudinal direction relatively, whereby the liquid excreta reaching the end regions on both sides can be diffused substantially in the longitudinal direction. That is, the absorbent article can be used as a whole, and the absorption performance is improved. In addition, in the end regions on both sides of the top sheet, the fibers are oriented in the longitudinal direction, so that the number of fibers exposed from the end edges to the outside in the width direction is small, and therefore friction against the skin can be reduced, and a decrease in the tactile sensation of the skin can be suppressed.

The absorbent article of the present invention may be (6) the absorbent article according to any one of the above (1) to (5), further comprising a pair of side sheets provided corresponding to both ends in the width direction of the auxiliary sheet and positioned on the non-skin side of the both ends, the auxiliary sheet having a pair of hollow wound-in three-dimensional portions provided corresponding to both ends in the width direction of the auxiliary sheet and configured to wind the both ends toward the non-skin surface side of the auxiliary sheet, wherein the end in the width direction of the auxiliary sheet at each of the pair of hollow wound-in three-dimensional portions is joined to the end on the inside in the width direction of the side sheet corresponding to the end of the pair of side sheets by a joining portion.

In the absorbent article, the auxiliary sheet has a pair of hollow wound three-dimensional portions at both ends. Therefore, when the absorbent article is sandwiched between the thighs of the user in the width direction and the absorbent body is deformed along the shape of the crotch of the user during use, the pair of hollow wound three-dimensional portions can easily deform following the deformation of the absorbent body. That is, the pair of hollow wound three-dimensional portions can be sandwiched between the two thighs of the user and can be raised toward the skin to be brought into close contact with the skin. This can prevent a gap from being formed between each hollow three-dimensional portion and the crotch portion, and liquid excrement from leaking from the gap. As a result, the liquid excrement can be appropriately guided to the absorber by the pair of hollow involved three-dimensional portions while ensuring the tactile sensation to the skin, and the absorption performance can be improved. In addition, when fibers that are easily disentangled, for example, water-retentive fibers (exemplified by cotton) are used as the surface sheet, the water-retentive fibers may be disentangled and dropped from both edges of the surface sheet in the width direction W due to scratches on both edges of the surface sheet in the width direction W. However, since the opposite end edges of the pair of ring portions are located outside the opposite end edges of the front sheet 2, the both end edges can be further prevented from being scraped. This can suppress a decrease in skin feel.

An absorbent article according to the present invention may be (7) the absorbent article according to the above (6), wherein a dimension of a portion of each of the pair of hollow roll-in solid portions outside the joint portion is larger than a dimension of a portion of the pair of end portions outside the joint portion in the width direction in a plan view.

In the absorbent article, the length (dimension) of the hollow wound solid portion in the width direction is longer than the length (dimension) of the end region of the front sheet in the width direction. Therefore, the pair of hollow winding three-dimensional portions can be more reliably raised toward the skin side and brought into close contact with the skin with the leg portions interposed therebetween. This can further suppress a situation in which a gap is formed between each hollow involved solid portion and the crotch portion and liquid excrement leaks from the gap. As a result, the liquid excrement can be guided more appropriately to the absorber by the pair of hollow wound three-dimensional portions while ensuring the tactile sensation to the skin, and the absorption performance can be improved.

The absorbent article of the present invention may be (8) the absorbent article according to (6) or (7), wherein the absorbent article has end fixing portions for fixing respective front and rear end portions of the pair of hollow wound three-dimensional portions in the longitudinal direction to front and rear portions of inner end portions of corresponding side sheets of the pair of side sheets, and the end fixing portions are located further outside than both end edges of the top sheet in the width direction.

The absorbent article has fixing portions for fixing the front and rear end portions of the hollow wound solid portion to the front and rear portions of the inner end portion of the side sheet, and the fixing portions are located outside the end edge of the top sheet. That is, both end portions in the longitudinal direction of the pair of hollow wound solid portions can be fixed without being hindered by both end regions on both sides of the front sheet and the rising at the central portion in the longitudinal direction of the pair of hollow wound solid portions sandwiched between both thigh portions. This can further suppress the hollow three-dimensional involved portions from being bent downward when sandwiched between the thighs, that is, the liquid excrement reaching the hollow three-dimensional involved portions can be further suppressed from leaking downward along the thighs.

The absorbent article of the present invention may be (9) the absorbent article according to any one of (6) to (8), further comprising a pair of compressed parts formed in a region where the top sheet and the absorbent body overlap in the thickness direction, the pair of compressed parts each reaching from a position of the top sheet to a position deeper than the joint part toward a non-skin surface side in the thickness direction.

In the absorbent article, the pair of compressed parts are formed deeper toward the non-skin surface side than the joint part. Therefore, when the absorbent article is sandwiched between the thighs of the user in the width direction and the absorbent body is deformed along the shape of the crotch of the user during use, the widthwise central portion (the excretory opening contact region) of the absorbent body can be deformed so as to protrude toward the skin side and come into contact with the excretory opening. This improves the fit while ensuring the tactile sensation of the absorbent article, and appropriately guides the liquid excrement to the absorber, thereby improving the absorption performance.

The absorbent article of the present invention may be (10) the absorbent article according to any one of the above (1) to (5), further comprising a pair of side sheets provided corresponding to the respective widthwise both ends of the auxiliary sheet and positioned on the skin side of the both ends, the pair of side sheets having a pair of three-dimensional gathers provided corresponding to the pair of side sheets and positioned on both ends of the pair of side sheets facing the inside in the widthwise direction, the pair of three-dimensional gathers having a fixed end at the outside in the widthwise direction and a free end at the inside, and the surface sheet being positioned between the fixed ends in the widthwise direction apart from the fixed ends of one of the pair of three-dimensional gathers and the other of the pair of three-dimensional gathers.

In the present absorbent article, the top sheet is located between the pair of fixed ends of the pair of three-dimensional gathers. Therefore, when a body pressure is applied to the top sheet, the pair of three-dimensional gathers can suppress leakage of liquid excreta from the top sheet to the side of the side sheet. In addition, even if liquid excrement accumulates in the end regions on both sides of the topsheet and lateral leakage occurs therefrom, lateral leakage of liquid excrement can be further suppressed because the pair of three-dimensional gathers are located at positions separated from the topsheet, and liquid excrement can be absorbed by the auxiliary sheet exposed at the separated positions. This enables the liquid excrement to be appropriately guided to the absorber while ensuring the tactile sensation to the skin, and the absorption performance can be improved.

An absorbent article of the present invention may be (11) the absorbent article according to (10) above, wherein the absorbent article has end fixing portions for fixing respective ends of the pair of three-dimensional gathers in the front and rear in the longitudinal direction to portions in front of and behind inner end portions of the corresponding side sheets of the pair of side sheets, and the end fixing portions are located outside both end edges of the top sheet in the width direction.

The absorbent article has end fixing portions for fixing the front and rear ends of the three-dimensional gathers to the front and rear portions of the inner end of the side sheet, and the end fixing portions are positioned further outward than the end edge of the topsheet. That is, both end portions of the pair of three-dimensional gathers in the longitudinal direction can be fixed without being hindered by both end regions on both sides of the topsheet and the rising of the pair of three-dimensional gathers. This can further suppress the three-dimensional gathers from falling down to the outside, that is, the liquid excreta reaching the three-dimensional gathers from leaking to the outside.

The absorbent article of the present invention may be (12) the absorbent article according to any one of (1) to (11), wherein the top sheet contains water-retentive fibers.

In the absorbent article of the present invention, the top sheet contains water-retentive fibers, and therefore the top sheet can have a good tactile sensation to the skin.

The absorbent article of the present invention may be (13) the absorbent article of (12) above, wherein the top sheet has a excretory opening contact region in the central region, and the excretory opening contact region contains a water-repellent finish.

In the absorbent article, the surface sheet containing water-retentive fibers has a weak water repellency in the excretory opening contact region. Therefore, it is possible to easily transfer the high-viscosity bodily fluid from the plurality of holes to the absorbent body while suppressing the diffusibility of the water-retentive fibers in the top sheet. Therefore, the skin feel of the entire topsheet can be improved, and the absorption performance of the excretory opening contact region can be improved.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article capable of improving the touch and the absorption performance is provided.

Drawings

Fig. 1 is a plan view showing a configuration example of an absorbent article according to the embodiment.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is an electron micrograph showing an example of pores of the surface sheet of the embodiment.

Fig. 4 is a schematic diagram showing an example of the structure of the pores of the surface sheet of the embodiment.

Fig. 5 is a schematic diagram showing a configuration example of the apparatus for manufacturing an absorbent article according to the embodiment.

Fig. 6 is a sectional view illustrating a method of manufacturing an absorbent article according to the embodiment.

Fig. 7 is a plan view showing another configuration example of the absorbent article of the embodiment.

Fig. 8 is a sectional view taken along line VIII-VIII of fig. 7.

Detailed Description

The absorbent article according to the embodiment will be described by taking a sanitary napkin as an example. However, the type and use of the absorbent article of the present invention are not limited to this example, and the present invention can be applied to other absorbent articles as long as the type and use do not depart from the scope of the subject matter of the present invention. Examples of other absorbent articles include pantiliners, light incontinence pads, and disposable diapers.

(embodiment 1)

Fig. 1 to 2 are views showing a configuration example of a sanitary napkin 1 according to an embodiment. FIG. 1 is a schematic representation of a bottleFig. 2 is a sectional view taken along line II-II of fig. 1, and is a plan view of the sanitary napkin 1 in an unfolded state. The sanitary napkin 1 of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other. In the sanitary napkin 1 depicted in fig. 1, the upper side and the lower side of the drawing are respectively the front side and the rear side in the longitudinal direction L, the left side and the right side are respectively the left side and the right side in the width direction W, and the front side and the back side facing the paper are respectively the upper side and the lower side in the thickness direction T. The sanitary napkin 1 has a longitudinal centerline C extending in the longitudinal direction L through the center in the width direction W _L (imaginary line) and a width-direction center line C passing through the center of the longitudinal direction L and extending in the width direction W _W (phantom line). Will be oriented toward the longitudinal center line C _L Is set to be the inner direction and the inner side of the width direction W respectively, and is far away from the center line C of the length direction _L The directions of (d) and (d) are respectively the outer direction and the outer side of the width direction W. On the other hand, will be oriented toward the width direction center line C _W Is set to be the inner direction and the inner side of the length direction L respectively, and is far away from the center line C of the width direction _W The direction and the one side of (d) are respectively set to the outer direction and the outer side of the longitudinal direction L. The sanitary napkin 1 placed on a plane including the longitudinal direction L and the width direction W as viewed from above in the thickness direction T is referred to as "planar shape", and the shape grasped in the planar view is referred to as "planar shape". An arbitrary direction in a plane including the longitudinal direction L and the width direction W is referred to as a "plane direction". The side relatively close to the skin surface of the wearer and the side relatively distant from the skin surface of the wearer in the thickness direction T when the sanitary napkin 1 is worn by the wearer who is positioned above are referred to as "skin side" and "non-skin side". The above definitions can be used in common for the respective materials of the sanitary napkin 1.

In the present embodiment, the sanitary napkin 1 (excluding the wing portions) has a substantially rectangular shape that is long in the longitudinal direction L and short in the width direction W in a plan view. The short sides at both ends in the longitudinal direction L have a substantially semicircular shape. The shape of the sanitary napkin 1 is not particularly limited as long as it is long in the longitudinal direction L and short in the width direction W. Examples of the shape include a rounded rectangle, an ellipse, an egg shape, and an hourglass shape. In the present embodiment, the sanitary napkin 1 includes a pair of flaps 9, 9 extending outward in the width direction W from a substantially rectangular portion. The wing 9 has a substantially trapezoidal shape. However, the shape may be, for example, a semicircular shape or a semi-elliptical shape.

The sanitary napkin 1 includes a topsheet 2, an auxiliary sheet 5, an absorbent member 4, a backsheet 3, and a fastening portion 7. The top sheet 2 is a liquid-permeable sheet, and in the present embodiment constitutes the skin-side surface of the sanitary napkin 1. The auxiliary sheet 5 is a liquid-permeable sheet, and is laminated on the non-skin side of the top sheet 2 in the present embodiment. The absorbent body 4 is a liquid-absorbent and liquid-retentive material, and is located between the front sheet 2 (and the auxiliary sheet 5) and the back sheet 3. The back sheet 3 is a liquid impermeable sheet, and in the present embodiment constitutes the non-skin side surface of the sanitary napkin 1. The fixing portion 7 is an adhesive for bonding the sanitary napkin 1 to the skin-side surface of underwear, and is positioned on the surface of the back sheet 3 on the non-skin side in the present embodiment. Therefore, in the sanitary napkin 1, the topsheet 2, the auxiliary sheet 5, the absorbent body 4, the backsheet 3, and the fixing portion 7 are stacked in this order in the thickness direction T.

In the present embodiment, the sanitary napkin 1 further includes a pair of side sheets 6, 6 and a pair of fastening portions 8, 8. The pair of side sheets 6, 6 are hydrophilic sheets, and are located on both sides of the auxiliary sheet 5 in the width direction W in the present embodiment. However, the pair of side pieces 6 and 6 may be waterproof pieces. The pair of fixing portions 8, 8 are adhesives for bonding the pair of wing portions 9, 9 to the non-skin side surface of the underwear, and in the present embodiment, the surface of the back sheet 3 on the non-skin side at the pair of wing portions 9, 9. The sanitary napkin 1 may further include an exterior sheet on the non-skin side of the back sheet 3.

In the present embodiment, the top sheet 2 has a substantially rectangular shape that is long in the longitudinal direction L and short in the width direction W. The short sides at both ends in the longitudinal direction L have a substantially semicircular shape. The surface sheet 2 includes a 1 st fiber layer 2a containing water-retentive fibers and a 2 nd fiber layer 2b containing water-retentive fibers and hydrophobic fibers. The skin-side surface of the 1 st fiber layer 2a constitutes the skin-side surface of the surface sheet 2. The non-skin-side surface of the second fibrous layer 2b is in contact with the skin-side surface of the second fibrous layer 2b. The non-skin side surface of the 2 nd fibrous layer 2b constitutes the non-skin side surface of the topsheet 2. Thus, the surface sheet 2 has a double-layer configuration. However, the top sheet 2 may have a single-layer structure having either the 1 st fiber layer 2a or the 2 nd fiber layer 2b, or may have a multilayer structure having three or more layers including other fiber layers.

The auxiliary sheet 5 has a shape slightly larger than the front sheet 2 in the width direction W. Therefore, the dimension of the auxiliary sheet 5 in the width direction W is larger than the dimension of the top sheet 2 in the width direction W (the dimension of the top sheet 2 in the width direction W is smaller than the dimension of the auxiliary sheet 5 in the width direction W). That is, the both end edges 5E, 5E in the width direction W of the auxiliary sheet 5 are located outside the both end edges 2E, 2E in the width direction W of the front sheet 2 in plan view. In this case, when the sanitary napkin 1 is used, the pair of wing portions 9, 9 are folded toward the non-skin side of the undergarment, so that the both end edges 5E, 5E of the auxiliary sheet 5 are easily brought into contact with the thighs of the user before the both end edges 2E, 2E of the topsheet 2.

In the present embodiment, the auxiliary sheet 5 has a substantially rectangular shape that is long in the longitudinal direction L and short in the width direction W. The short sides at both ends in the longitudinal direction L have a substantially semicircular shape. The auxiliary sheet 5 includes a pair of ring portions (hollow winding solid portions) 5L and 5L at both ends in the width direction W. The pair of loop portions 5L, 5L are formed by folding both side portions of the auxiliary sheet 5 in the width direction W into a loop shape on the inner side in the width direction W of the auxiliary sheet 5 and on the non-skin side (lower side in the thickness direction T). The end portions of the folded-back both side portions of the auxiliary sheet 5 and the pair of inner end portions of the pair of side sheets 6, 6 facing each other are joined to each other by a pair of joining portions 18, 18 (exemplified by a hot-melt adhesive) intermittently or continuously extending along the longitudinal direction L. In this case, the outermost edge of the ring portion 5L in the width direction W serves as an end edge 5E. In addition, the ring portion 5L does not include an elastic member. Therefore, the auxiliary sheet 5, the top sheet 2, and the absorbent body 4 can be made less likely to contract in the longitudinal direction L, and thus, holes and pores described below can be made less likely to be clogged. The end portions of the folded-back both side portions of the auxiliary sheet 5 may be further joined to the non-skin side surface of the auxiliary sheet 5 by a pair of joining portions (not shown, exemplified by a hot-melt adhesive) extending intermittently or continuously in the longitudinal direction L.

In the present embodiment, the top sheet 2 and the auxiliary sheet 5 are bonded to each other with an adhesive (not shown, hot melt adhesive is exemplified). The adhesive is applied to the front sheet 2 or the auxiliary sheet 5 (not shown) in a plurality of predetermined patterns extending in the longitudinal direction L and arranged in the width direction W. Examples of the predetermined pattern include a stripe shape, an omega repeating shape, and a wave repeating shape. The adhesive is applied about the longitudinal centerline C _L A substantially axisymmetric region.

The surface sheet 2 is divided into a region to which the adhesive is applied in accordance with the above-described predetermined pattern and a region outside the region to which the adhesive is not applied. In the present embodiment, both end edges in the width direction W of the region to which the adhesive is applied and both end edges extending in the longitudinal direction L are defined as a pair of joining portion end edges 17, 17. At this time, the top sheet 2 is divided in the width direction W into a central region where the adhesive is applied on the pair of joining portion end edges 17, 17 and inside the pair of joining portion end edges 17, and a pair of end regions where the adhesive is not applied outside the pair of joining portion end edges 17, 17. The former is set as a center region CA, and the latter is set as a pair of end regions EA, EA. Therefore, the front sheet 2 has a central region CA located at the center in the width direction W and a pair of end regions EA and EA adjacent to both outer sides in the width direction W of the central region CA. The central region CA is a region joined to the auxiliary sheet 5, and the pair of end regions EA, EA are regions not joined to the auxiliary sheet 5. Therefore, in each of the pair of end regions EA, the inner end edge in the width direction W is connected to the end edge of the central region CA and is a fixed end, and the outer end edge in the width direction W (excluding both end portions in the longitudinal direction L) is a free end which is not joined to any member. That is, the pair of end regions EA and EA are formed to be able to rise from the auxiliary sheet 5. The end regions EA may be partially joined to the auxiliary sheet 5, the side sheet 6, and the absorbent body 4.

The central area CA and the pair of end areas EA, EA are all relative to the longitudinal central line C _L And (4) axial symmetry. The range of the central region CA in the width direction W in the top sheet 2 may be, for example, 70% to 96% of the dimension in the width direction W of the absorbent body 4 including the excretory opening contact region XA and the pair of compressed sections 12 and 12 (described later). If the size in the width direction W of the absorbent body 4 is less than 70%, the end area EA in the width direction W of the topsheet 2 is rolled up and thickened, a gap is formed between the part of the topsheet 2 other than the rolled-up thickened part and the body of the wearer, and liquid excrement is likely to leak out through the skin of the wearer. If the dimension in the width direction W of the absorbent body 4 is larger than 96%, the end portions in the width direction W of the top sheet 2 are closely attached by the joining of the top sheet 2 and the auxiliary sheet 5, and the pair of end regions EA, EA are difficult to rise. The width direction W of the pair of end regions EA, EA in the front sheet 2 is the remaining portion excluding the central region CA.

In the present embodiment, the absorbent body 4 has a substantially rectangular shape that is long in the longitudinal direction L in a plan view. Both ends of the absorbent body 4 in the longitudinal direction L have a substantially semicircular shape. The absorbent body 4 includes an absorbent core 4a and a core wrap 4b covering the absorbent core 4 a.

In the present embodiment, the auxiliary sheet 5 and the portions of the pair of side sheets 6 and 6 that face the non-skin side portion of the absorbent body 4 and the skin side surface of the absorbent body 4 are joined to each other with an adhesive (exemplified by a hot melt adhesive) of a predetermined pattern. The auxiliary sheet 5, the pair of side sheets 6 and 6, and the absorbent body 4 are joined to the back sheet 3 at a portion facing the back sheet 3 on the non-skin side by an adhesive (exemplified by a hot-melt adhesive) having a predetermined pattern, heat sealing, or the like.

In the sanitary napkin 1, the excretory opening contact region XA is set at a position slightly forward of the center in the longitudinal direction L and at the center in the width direction W in a plan view. The excretory orifice abutment region XA isA region facing or in contact with the excretory opening of the user when the sanitary napkin 1 is used. The excretory opening contact region XA is set according to the type and use of the absorbent article. The excretory opening contact region XA is set to a length of about 1/4 to 1/2 of the entire length of the absorbent body 4 at a position slightly forward of the center of the absorbent body 4 in the longitudinal direction L, and is set to a width of about 1/3 to 1/2 of the entire width of the absorbent body 4 at substantially the center of the absorbent body 4 in the width direction W, for example. The sanitary napkin 1 has a longitudinal front region A in the longitudinal direction L _F And a longitudinal central region A _C Longitudinal rear region A _B . Longitudinal central region A _C Including the excretory orifice abutment region XA. Longitudinal front region A _F And a longitudinal central region A _C Includes an end portion of the drain port abutment region XA located forward in the longitudinal direction L, adjacent forward in the longitudinal direction L. Longitudinal rear area A _B And a central region A in the longitudinal direction _C Includes an end portion of the excretory opening abutment region XA located rearward in the longitudinal direction L.

The central area CA of the front sheet 2 has a plurality of holes. In the present embodiment, the sanitary napkin 1 is disposed in the central region CA, preferably in the longitudinal central region a _C The inner portion, more preferably, the excretory opening abutment region XA has a plurality of dot-shaped (circular) compressed portions 15. The dot-shaped compressed portion 15 is formed by compressing the topsheet 2 and the absorbent body 4 in a dot shape in the thickness direction T. That is, the topsheet 2, the auxiliary sheet 5, and the absorber 4 (the absorbent core 4a and the skin-side portion of the core wrap 4 b) are compressed in the thickness direction T. As a result, the top sheet 2 is formed with concave portions depressed in a dot shape toward the absorbent body 4. In the present embodiment, the recessed portions correspond to the holes of the front sheet 2. However, the hole portions are not limited to this example, and other structures such as holes (through holes) formed by punching and penetrating the absorbent body 4 from the top sheet 2 and holes (void holes) formed by intentionally generated fiber unevenness when the top sheet 2 is interlaced can be cited. In the present embodiment, the shape of the compression unit 15 in plan view is circular, but may be other shapes, for example, polygonal, elliptical, star-shaped, and the like。

In the present embodiment, the sanitary napkin 1 further includes a pair of compressed parts (compressed grooves) 12, a pair of compressed parts (compressed grooves) 13, and compressed parts (compressed grooves) 11, 14. The pair of compressing portions 12, 12 are located continuously or intermittently along the longitudinal direction L on both outer sides of the drain port abutment region XA in the width direction W, and the pair of compressing portions 13, 13 are located continuously or intermittently along the longitudinal direction L behind the pair of compressing portions 12, 12 in the longitudinal direction L. The compression portions 11, 14 are located respectively forward and rearward of the discharge port abutment region XA in the longitudinal direction L. At the compression sections 11 to 14, the topsheet 2 (the auxiliary sheet 5) and the absorbent body 4 (the skin-side portion of the core wrap 4b and the absorbent core 4 a) are compressed in the thickness direction T. The bottom portions of the compressed portions 11 to 14 in the thickness direction T are located inside the absorbent core 4a, but may reach the non-skin side portion of the core wrap 4b. In the present embodiment, the shapes of the compression units 11 to 14 in plan view are linear, but may be other shapes, for example, a polygon, a circle, an ellipse, a star, or a combination of these shapes. At least one of the compression units 11 to 14 may be omitted.

The first fibrous layer 2a contains water-retentive fibers, and thus the surface sheet 2 can have a good tactile sensation to the skin. The water-retentive fiber is not particularly limited as long as it has a property of absorbing and retaining water (water-retentive property). Examples of the water-retentive fibers include cellulose fibers. The cellulose-based fiber is not particularly limited as long as it is a cellulose-containing fiber, and examples thereof include natural cellulose fibers, regenerated cellulose fibers, purified cellulose fibers, and semi-synthetic cellulose fibers. Examples of the natural cellulose fiber include plant fibers, such as seed fibers (e.g., cotton), bast fibers (e.g., hemp), vein fibers (e.g., manila hemp), and fruit fibers (e.g., coconut). Examples of the cotton include upland cotton (exemplified by upland cotton), sea island cotton, tree cotton and grass cotton. Cotton may be Organic Cotton or Pre Organic Cotton (trademark). The Organic Cotton is Cotton certified by GOTS (Global Organic Textile Standard). Examples of the regenerated cellulose fibers include rayon, such as viscose rayon obtained from viscose, kapok, and cuprammonium rayon (also referred to as "cupra") obtained from a cuprammonium salt solution of cellulose. Examples of the refined cellulose fibers include lyocell, specifically, a material obtained by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to prepare a dope (dope) and extruding the dope into a diluted solution of N-methylmorpholine N-oxide to prepare fibers. The purified cellulose is, for example, a purified cellulose commercially available as Tencel (trademark). Examples of the semi-synthetic cellulose fibers include semi-synthetic cellulose, such as acetate fibers, and fibers such as triacetate and diacetate. Among these, natural cellulose fibers are preferable, cotton is more preferable, and upland cotton is even more preferable, from the viewpoint of water retentivity and skin touch. In the present embodiment, the water-retentive fibers are cotton based on upland cotton (hereinafter, also simply referred to as "cotton").

The 2 nd fiber layer 2b contains hydrophobic fibers and water-retentive fibers. The hydrophobic fiber is not particularly limited as long as it is a fiber having hydrophobicity. Examples of the hydrophobic fibers include thermoplastic resin fibers. The thermoplastic resin fiber is not particularly limited as long as it is a fiber containing a thermoplastic resin. Examples of the thermoplastic resin include known resins such as olefin resins including Polyethylene (PE), polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA), polyester resins including polyethylene terephthalate (PET) and polylactic acid (PLA), and polyamide resins including 6-nylon, and these resins may be used alone or in combination of two or more. The structure of such a fiber made of a thermoplastic resin is not particularly limited, and examples thereof include a composite fiber such as a sheath-core fiber, a side-by-side fiber, and an island-in-sea fiber; hollow-type fibers; flat, Y-shaped, C-shaped and other special-shaped section fibers; three-dimensionally crimped fibers that are potentially crimped or appear crimped (Japanese: 38997; fibers having such a structure may be used alone or in combination of two or more types of fibers. In the present embodiment, the hydrophobic fiber is a PET/PE sheath-core composite fiber. The water-retentive fibers are the same as the water-retentive fibers of the 1 st fibrous layer 2 a. The 2 nd fibrous layer 2b contains water-retentive fibers, and thus can provide the topsheet 2 with a good tactile sensation. The term "hydrophobicity" refers to a property of being difficult to be dissolved in water or to retain water, and refers to a property of having a contact angle with ion-exchanged water (for example, a specific resistance of 10 M.OMEGA.cm) of about 80 to 100 degrees.

In the present embodiment, the fibers constituting the 1 st fiber layer 2a are not particularly limited, and for example, the following characteristics can be provided from the viewpoint of not adversely affecting the texture of the surface sheet 2. The water-retentive fibers in the 1 st fiber layer 2a may be contained in an amount of, for example, 70 to 100% by mass. The fiber length and average fiber length of the fiber can be, for example, 10mm to 80mm and 15mm to 60mm. Examples of the fibers other than the water-retentive fibers in the 1 st fiber layer 2a include thermoplastic resin fibers, and the fiber length and average fiber length of the fibers can be about the same as those of the water-retentive fibers (in the range of 0.5 to 2 times). The thickness of the 1 st fiber layer 2a is not particularly limited, and may be, for example, 0.05mm to 4mm.

In the present embodiment, the fibers constituting the 2 nd fiber layer 2b are not particularly limited, and for example, the following characteristics can be obtained from the viewpoint of not adversely affecting the touch and the touch of the top sheet 2 and the introduction of the liquid from the 1 st fiber layer 2 a. The water-retentive fiber content of the 2 nd fibrous layer 2b is, for example, less than the water-retentive fiber content of the 1 st fibrous layer 2a, and can be, for example, 50 to 90 mass%. The fiber length and average fiber length of the fibers are shorter than those of the water-retentive fibers of the 1 st fiber layer 2a, for example, and can be 3mm to 40mm and 5mm to 30mm. The fiber length and average fiber length of the hydrophobic fibers of the 2 nd fiber layer 2b can be, for example, 10mm to 80mm and 15mm to 60mm. The thickness of the 2 nd fiber layer 2b is not particularly limited, and may be, for example, 0.05mm to 4mm.

In the present embodiment, in the 1 st fiber layer 2a and the 2 nd fiber layer 2b, the proportion of the water-retentive fibers in the fibers constituting the 1 st fiber layer 2a is preferably larger than the proportion of the water-retentive fibers in the fibers constituting the 2 nd fiber layer 2b. That is, the skin feel of the topsheet 2 can be improved. Further, in the 1 st fiber layer 2a and the 2 nd fiber layer 2b, it is preferable that the average fiber length of the water-retentive fibers of the 2 nd fiber layer 2b is shorter than the average fiber length of the water-retentive fibers of the 1 st fiber layer 2a, and the average fiber length of the hydrophobic fibers of the 2 nd fiber layer 2b is of the same degree, and the basis weights of the two fiber layers are of the same degree. Thereby, the fibers constituting the 2 nd fiber layer 2b are brought closer to each other, that is, the distance between the fibers is shortened, and the capillary phenomenon can be more strongly generated, so that the liquid excrement of the 1 st fiber layer 2a is strongly introduced into the 2 nd fiber layer 2b. Further, it is preferable that the fiber density of the 2 nd fiber layer 2b is larger than that of the 1 st fiber layer 2 a. The fiber density is a density of the number of fibers. Thereby, a gradient of the fiber density is formed such that the fiber density increases as going from the 1 st fiber layer 2a toward the 2 nd fiber layer 2b, so that the liquid excrement of the 1 st fiber layer 2a can be strongly introduced into the 2 nd fiber layer 2b. Further, the liquid excrement can be stably transferred to the auxiliary sheet in contact with the non-skin side of the 2 nd fiber layer 2b.

In the present embodiment, the auxiliary sheet 5 is not particularly limited as long as it is liquid-permeable, but for example, a liquid-permeable nonwoven fabric, for example, a nonwoven fabric of hydrophobic fibers, and among them, a nonwoven fabric of thermoplastic resin fibers is preferably used. In addition, when the top sheet 2 contains water-retentive fibers, preferably cellulose-based fibers, and more preferably cotton, the auxiliary sheet 5 may contain water-retentive fibers, preferably cellulose-based fibers, and more preferably cotton in accordance with the water-retentive fibers. In the sanitary napkin 1 having such a structure, the water-retentive fibers having high liquid diffusibility and the like are communicated from the 1 st fiber layer 2a of the top sheet 2 to the auxiliary sheet 5 through the 2 nd fiber layer 2b. Therefore, liquid diffusion of liquid excrement by these fibers can be utilized to more stably transfer liquid excrement from the topsheet 2 to the absorbent body 4 via the auxiliary sheet 5, and the skin feel of the topsheet 2 can be improved while the absorption performance is improved.

In the present embodiment, the absorbent core 4a of the absorbent body 4 is not particularly limited as long as it has liquid absorption properties and liquid retention properties, but examples thereof include liquid retention materials including water-absorbent fibers such as pulp fibers, and water-absorbent materials such as Super Absorbent Polymers (SAP). The core wrap layer 4b is not particularly limited as long as it can hold the absorbent core 4a, but for example, a liquid-permeable sheet including a hydrophilic nonwoven fabric such as tissue paper can be used.

The side sheet 6 is not particularly limited, but examples thereof include a nonwoven fabric subjected to water repellent treatment and a synthetic resin film having air permeability. The back sheet 3 is not particularly limited, but examples thereof include a liquid impermeable nonwoven fabric, a synthetic resin film, and a composite sheet of these materials. In the present embodiment, the wing portions 9 are formed by the side sheets 6 and the back sheet 3.

The sanitary napkin 1 described above has a plurality of holes (in the present embodiment, the plurality of compressed sections 15) that are not opened and closed by the movement of the user's body, but are initially opened. Here, the hole portion (compressed portion 15) is a recessed portion or a portion penetrating to the opposite side in the front sheet 2, and includes a recess and a through hole formed by compression. Such a hole (compression portion 15) can suppress the shape of the hole (compression portion 15) from varying regardless of the movement of the user's body. This reduces the irritation such as friction on the skin of the user around the hole (compressed portion 15) when the sanitary napkin is used, and thus improves the tactile sensation felt by the user.

Further, the central region CA of the front sheet 2 is joined to the auxiliary sheet 5 and has a plurality of holes (compressed portions 15). Thus, when the sanitary napkin is used, liquid excrement can be rapidly transferred from the plurality of holes (compressed portions 15) of the topsheet 2 to the absorbent body 4 through the auxiliary sheet 5. That is, the liquid excrement can be efficiently absorbed by the hole (the compressing section 15).

At this time, since the auxiliary sheet 5 has a shape larger than the front sheet 2 in the width direction W, both end edges 5E, 5E of the auxiliary sheet 5 are located outside both end edges 2E, 2E of the front sheet 2. Thus, when the sanitary napkin is used, the both end edges 5E, 5E of the auxiliary sheet 5 can be brought into contact with the thighs earlier than the both end edges 2E, 2E of the topsheet 2 in the width direction W, and the auxiliary sheet 5 can be compressed inward and deformed so as to rise upward (in the direction of the excretory opening). Thus, the pair of end regions EA, which are placed on the auxiliary sheet 5 without being joined to the auxiliary sheet 5, can be deformed so as to rise further upward (in the direction of the drain opening), and can function like a pair of wall portions. This can prevent the liquid excrement from spreading outward in the width direction W and reaching the pair of end regions EA and EA. That is, the contact of the liquid excrement with the skin of the user in a plan view can be reduced, and the burden on the skin of the user can be reduced.

In this way, the sanitary napkin 1 can improve the skin feel and the absorption performance.

Fig. 3 and 4 are diagrams showing examples of the structure of pores of the top sheet according to the embodiment. Fig. 3 is an electron micrograph showing an example of a pore, and fig. 4 is a schematic view showing an end in the width direction W of a structural example of a front sheet. As illustrated in fig. 3, the center region CA and the pair of end regions EA and EA of the top sheet 2 have a plurality of pores 21. In the fine pores 21, for example, the dimension a (μm) in the width direction W may be 100 μm to 5mm, and the dimension b (μm) in the longitudinal direction L may be 100 μm to 5mm.

The surface sheet 2 is formed by interlacing a fiber web. In the present embodiment, the fiber web for the 1 st fiber layer 2a and the fiber web for the 2 nd fiber layer 2b of the topsheet 2 are interlaced and joined to each other by water flow. As a method of interlacing by water flow, for example, a Spunlace (Spunlace) method or a water jet (water jet) method can be cited. A desired plurality of fine pores 21 can be formed in the surface sheet 2 by appropriately adjusting conditions of water flow at the time of interlacing, shapes of irregularities on a drum (drum) and a table (belt) on which the interlaced sheet is arranged, a conveying speed of the interlaced sheet, a tension in a conveying direction MD, and the like. However, the method of interlacing the fibers constituting the top sheet 2 is not limited to this example, and other interlacing methods, for example, an interlacing method using air such as a hot air method, may be used.

In the present embodiment, the area of each pore 21 existing in the central region CA is larger than the area of each pore 21 existing in each of the pair of end regions EA, EA in a plan view.

As shown in fig. 4 (a), at an end edge 2E in the width direction W of each of the pair of end regions EA, EA (end edge 2E in the width direction W of the surface sheet 2) in a plan view, a partially missing pore 21a formed by cutting the surface sheet 2 out of the plurality of pores 21 exists. The pores 21a form a recess 22. The recess 22 is recessed inward in the width direction W by, for example, at least the length d0. Therefore, the concave-convex shape 23 is formed at the end edge 2E by the plurality of concave portions 22 formed by the plurality of fine pores 21a. At this time, the degree of unevenness of the uneven shape 23, that is, the degree of concavity of the concave portion 22 is about the length d0.

Here, in the sanitary napkin 1 of the present embodiment, as described above, the area of each pore 21 existing in the pair of end regions EA, EA in a plan view is relatively small. Therefore, the size (length d 0) of the plurality of concave portions 22 formed by the plurality of fine pores 21a present at the end edge 2E can be made relatively small, and therefore the degree of unevenness of the uneven shape 23 can be made relatively small. This reduces the friction irritation on the skin of the user caused by the uneven shape 23 of the end edge 2E of the top sheet 2, and improves the tactile sensation on the skin. In addition, the area of each pore 21 existing in the central region CA of the front sheet 2 is relatively large in a plan view. Therefore, the liquid excrement can be rapidly transferred from the plurality of pores 21 of the topsheet 2 to the absorbent member 4 through the auxiliary sheet 5, and the absorption performance can be improved. In this way, the sanitary napkin 1 can improve the skin feel and the absorption performance.

In the present embodiment, in the top sheet 2, the area of the pores 21 in the central region CA and the pair of end regions EA, EA is 0.01mm in plan view ² Above and 25mm ² The following.

In the sanitary napkin 1, the area of the pores 21 in the central region CA and the pair of end regions EA, EA is 0.01mm ² This can increase the effect of passing liquid excreta, and can improve the absorption performance. In addition, the area of the fine holes 21 is 25mm ² As described below, the uneven portion of the uneven shape 23 formed by the presence or absence of the fine pores 21 can be suppressed from becoming excessively large, and the frictional irritation to the skin of the user can be reduced, thereby improving the skin feel. The area of the fine pores 21 is more preferably 1mm ² The following. If the pores 21 are large, the user may misunderstand the sanitary napkin 1 as a defective product, which is a perforated product, but the possibility can be eliminated by further reducing the pores 21. Therefore, the function of the fine pores 21 can be ensured and the concern of the appearance of the user can be eliminated.

In the present embodiment, the pores 21 present in the pair of end regions EA, EA have a shape in which the dimension dW in the width direction W is shorter than the dimension dL in the longitudinal direction L in a plan view.

As shown in fig. 4 (b), in the sanitary napkin not according to the present embodiment, at an end edge 2Ex in the width direction W in the end region EA of the top sheet 2x (the end edge 2Ex in the width direction W of the top sheet 2 x) in a plan view, a locally missing pore 21ax formed by cutting the top sheet 2x out of the plurality of pores 21x is present. Then, the fine holes 21ax form recesses 22x. The recess 22x is recessed inward in the width direction W by, for example, at least the length d0x. Therefore, the concave-convex shape 23x is formed at the end edge 2Ex by the plurality of concave portions 22x formed by the plurality of fine pores 21ax. At this time, the degree of unevenness of the uneven shape 23x, that is, the degree of depression of the recessed portion 22x is about the length d0x (> d 0). However, the pore 21x has a shape in which the dimension dWx in the width direction W is longer than the dimension dLx in the longitudinal direction L. Therefore, the number of the pores 21ax partially lacking at the end edge 2Ex in the width direction W of the top sheet 2x is large in a plan view, and the degree of the irregularities in the width direction W formed by the pores 21ax partially lacking at the end edge 2Ex is large.

On the other hand, in the sanitary napkin 1 of the present embodiment, the pores 21 present in the end regions EA of the topsheet 2 have a shape that is relatively long in the longitudinal direction L in a plan view. Therefore, the number of pores 21a locally lacking at the edge 2E in the width direction W of the front sheet 2 (of the end region EA) in a plan view can be reduced, and the degree of irregularity in the width direction W formed by the pores 21a locally lacking at the edge 2E can be reduced. Thus, when the pair of end regions EA, EA of the topsheet 2 stand up toward the skin side, the frictional irritation of the topsheet 2 to the skin of the user can be reduced, and the skin feel can be improved.

The area and shape of the pores 21 were measured by the following methods. (1) The surface sheet 2 was cut into a size of 40mm × 40mm to prepare a sample. (2) Using a scanning electron microscope FlexSEM1000 manufactured by hitachi high and new technologies of japan, ltd.c. at an imaging magnification: 37 times, measurement area: an image was taken from the surface of the surface sheet 2 (the 1 st fiber layer 2 a) under the condition of 22.25mm in length × 36.25mm in width. At this time, the image is captured five times in total under the condition that the depth from the surface is 0 μm. (3) From each of the obtained images, a portion where no fiber is present is identified, and the area, dL, and dW are determined. The average of the five times is then set as the area, dL, and dW of the pores 21.

In the present embodiment, the top sheet 2 is formed of a nonwoven fabric, and the fibers in the end regions EA are oriented along the longitudinal direction L as compared with the fibers in the central region CA among the fibers constituting the nonwoven fabric. That is, in the width direction W, in the top sheet 2, the orientation in the longitudinal direction L of the fibers in the central region CA is relatively small, and the orientation in the longitudinal direction L of the fibers in the both end regions EA, EA is relatively large.

In the sanitary napkin 1 having such a structure, the fibers in the central region CA of the topsheet 2 formed of a nonwoven fabric are relatively randomly oriented, and thus the liquid excrement discharged into the central region CA can be diffused substantially concentrically and without leakage. The fiber orientations of the end regions EA, EA on both sides are relatively oriented in the longitudinal direction L, and thus the liquid excreta that has reached the end regions EA, EA on both sides can be diffused substantially in the longitudinal direction L. That is, the sanitary napkin 1 can be used as a whole, and the absorption performance is improved. In addition, in the end regions EA, EA on both sides of the topsheet 2, the fibers are oriented in the longitudinal direction L, so that the number of fibers exposed to the outside in the width direction W from the end edges 2E, 2E on both sides is reduced, and therefore, friction against the skin can be reduced, and a decrease in the tactile sensation to the skin can be suppressed.

In the present embodiment, as described above, the auxiliary sheet 5 further includes the pair of side sheets 6 and 6, and the pair of side sheets 6 and 6 are provided so as to correspond to both ends in the width direction W of the auxiliary sheet 5 and are positioned on the non-skin side of the both ends. The auxiliary sheet 5 has a pair of ring portions (hollow wound solid portions) 5L, and the pair of ring portions 5L, 5L are provided corresponding to both end portions of the auxiliary sheet 5 in the width direction W and are configured such that the both end portions are wound toward the non-skin surface side of the auxiliary sheet 5. The end portion in the width direction W of the auxiliary piece 5 at each of the pair of ring portions 5L, 5L is joined to the inner end portion in the width direction W of the side piece corresponding to the end portion of the pair of side pieces 6, 6 by a joining portion 18.

The sanitary napkin 1 having such a structure has a pair of ring portions 5L, 5L (hollow wound three-dimensional portions). Therefore, when the sanitary napkin 1 is sandwiched between the thighs of the user in the width direction W and the absorbent body 4 is deformed along the shape of the crotch of the user during use, the pair of loop portions 5L, 5L can easily deform following the deformation of the absorbent body 4. That is, the pair of ring portions 5L, 5L can be held between the two thighs of the user and raised toward the skin side to be brought into close contact with the skin. This can prevent a gap from being formed between each ring portion 5L and the crotch portion and liquid excrement from leaking from the gap. As a result, the liquid excrement can be appropriately guided to the absorbent body 4 by the pair of loop portions 5L, 5L in addition to the pair of end regions EA, EA while ensuring a tactile sensation, and the absorption performance can be further improved. In addition, when fibers that are easily loosened, for example, water-retentive fibers (exemplified: cotton) are used as the surface sheet 2, the water-retentive fibers may be loosened and fall off from the both end edges 2E, 2E of the surface sheet 2 in the width direction W due to scratching of the both end edges 2E, 2E of the surface sheet 2 in the width direction W. However, since the opposite end edges 5E, 5E of the pair of ring portions 5L, 5L are located outside the opposite end edges 2E, 2E of the front sheet 2, the both end edges 2E, 2E can be further prevented from being scratched. This can suppress a decrease in skin feel. Further, the force received from the legs can be flexibly received by the cushioning effect of the pair of ring portions 5L, and the feeling of the user's skin can be further improved.

In the present embodiment, in a plan view, in the width direction W, the dimension of the portion outside the joint portion 18 of each of the pair of ring portions (hollow winding solid portion) 5L, 5L is larger than the dimension of the portion outside the joint portion 18 of each of the pair of end regions EA, EA.

In the sanitary napkin 1 having such a configuration, the length (dimension) of the ring portion (hollow entangled three-dimensional portion) 5L in the width direction W is longer than the length (dimension) of the end region EA in the width direction W. Therefore, the pair of ring portions 5L, 5L can be more reliably raised toward the skin side and brought into close contact with the skin with both the leg portions interposed therebetween. This can further suppress the formation of a gap between each ring portion 5L and the crotch portion and leakage of liquid excrement from the gap. As a result, the liquid excrement can be guided more appropriately to the absorber by the pair of ring portions 5L, 5L while ensuring the tactile sensation to the skin, and the absorption performance can be improved.

In the present embodiment, the sanitary napkin 1 has end fixing portions 19 for fixing the front and rear end portions of each of the pair of loop portions (hollow wound three-dimensional portions) 5L, 5L in the longitudinal direction L to the front and rear portions of the inner end portion of the corresponding side sheet 6 of the pair of side sheets 6, 6. The end fixing portions 19 are located outward of both end edges 2E of the front sheet 2 in the width direction W. The end fixing portion 19 can be formed by bonding with an adhesive such as a hot-melt adhesive or by heat sealing. The pair of ring portions (hollow wound three-dimensional portions) 5L, 5L may be joined to the absorbent body 4, respectively.

In the sanitary napkin 1 having such a configuration, the end fixing portions 19 for fixing the front and rear ends of the loop portion (hollow wound solid portion) 5L to the front and rear portions of the inner end of the side sheet 6 are located outside the both end edges 2E, 2E of the topsheet 2. Therefore, both end portions in the longitudinal direction L of the pair of ring portions 5L, 5L can be fixed without hindering the rising of the pair of end portions EA, EA on both sides of the front sheet 2 and the central portion in the longitudinal direction L of the pair of ring portions 5L, 5L sandwiched between both the leg portions. This can further suppress the loop portions 5L from being bent downward when sandwiched between the thigh portions, that is, the liquid excrement reaching the loop portions 5L can be further suppressed from leaking downward along the thigh portions.

In the present embodiment, the absorbent article further includes a pair of compressed parts 12, and the pair of compressed parts 12, 12 are formed in a region where the topsheet 2 and the absorbent body 4 overlap in the thickness direction T. The pair of compressed parts 12, 12 reaches from the position of the front sheet 2 to a position deeper than the pair of joined parts 18, 18 toward the non-skin surface side in the thickness direction T.

In the sanitary napkin 1 having such a configuration, the pair of compressed portions 12 and 12 are formed deeper toward the non-skin surface side than the pair of joined portions 18 and 18. Therefore, when the sanitary napkin 1 is used and sandwiched between the thighs of the user in the width direction W and the absorbent body 4 is deformed along the shape of the crotch of the user, the center portion (the excretory opening contact region XA) in the width direction W of the absorbent body 4 can be deformed so as to protrude toward the skin side and come into contact with the excretory opening. This can improve the fit while ensuring the tactile sensation of the sanitary napkin 1, and can appropriately guide the liquid excrement to the absorbent body 4, thereby improving the absorption performance.

In the present embodiment, the top sheet 2 may contain an oil agent having weak water repellency in the excretory opening contact region XA in the central region CA. Here, as the oil agent having weak water repellency, for example, a blood modifying agent described in japanese patent application laid-open No. 2013-081772 can be cited.

In the sanitary napkin 1 having such a configuration, particularly when the topsheet 2 contains the water-retentive fibers, the excretory opening contact region XA is made to have a weak water repellency, so that the diffusibility of the water-retentive fibers in the topsheet 2 is suppressed, and liquid excreta having a high viscosity can be easily transferred from the plurality of pores 21 to the absorbent body 4. Therefore, the absorption performance in the excretory opening contact region XA can be improved while the overall tactile sensation of the topsheet 2 is improved.

In the present embodiment, the top sheet 2 may have a concavo-convex structure. For example, at least the 1 st fiber layer 2a may have: a plurality of projections extending continuously along the longitudinal direction L and located at positions spaced apart in the width direction W; and a plurality of concave portions continuously extending along the length direction L and located between the convex portions adjacent to each other. In this case, each of the plurality of projections may be formed to be solid. When the plurality of projections are formed to be solid in this manner, each projection is less likely to be crushed, and the liquid is excellent in transferability from the projection which is likely to come into contact with the body of the user to the absorbent body 4, so that the dryness of the surface of the projection can be improved.

The proportions of the types of fibers in a sheet such as a fiber layer were measured as follows.

That is, the ratio of the types of fibers is measured by coloring the water-retentive fibers and the hydrophobic fibers with different colors, respectively. (1) The surface sheet 2 was cut into a size of 70mm × 70mm to prepare a sample. (2) Coloring treatment was performed with a reagent KayastainQ (japanese: 12459\12516\12473124861245212531q) (color dyeing co, ltd.) to dye only the water-retentive fibers blue and only the hydrophobic fibers yellow. (3) The ratio of blue to yellow observed from the skin side (the 1 st fiber layer 2 a) of the sample was measured in a range of 50mm × 50mm using a digital microscope VHX-100 manufactured by keyence corporation, and the ratio was set as the ratio of the types of fibers in the 1 st fiber layer 2 a. On the other hand, the ratio of blue to yellow when viewed from the non-skin surface (2 nd fiber layer 2 b) was measured in a range of 50mm × 50mm, and the ratio was set as the ratio of the types of fibers in the 2 nd fiber layer 2b.

Further, the distance between fibers in a sheet such as a fiber layer was measured according to the following measurement method. (1) The surface sheet 2 was cut into a size of 10mm × 10mm to obtain a sample. (2) A digital microscope VHX-100 (lens VH-Z20R + variable lighting fixture VH-K20) manufactured by Yonzhi, K.K.) was used to photograph magnification: 200 times, measurement area: images were taken from the front surface (1 st fiber layer 2 a) and the back surface (2 nd fiber layer 2 b) of the front sheet 2 under the conditions of 1300 μm in vertical direction and 1735 μm in horizontal direction, respectively. In this case, images were taken for the front and back surfaces at a depth of 0 μm to 100 μm and a depth of 20 μm in total of five times. (3) The area of the portion where no fiber is present is determined from each of the obtained images. At this time, whether or not there is a fiber under each pixel is determined based on whether or not the luminance under each pixel in each obtained image is lower or higher than a predetermined luminance (threshold value), and whether or not there is a fiber in the imaging region in each image is determined. Of these, only the portion where no fiber is present transmits light and is bright, that is, has high brightness. The area of the portion where no fiber exists in the imaging region is thus determined. (4) The void ratio is calculated by dividing the area of the portion where no fiber is present by the area of the imaging region (measurement area). This calculation was performed using images at 20 μm intervals of depth, and five void ratios were calculated. (5) The void ratios of the front surface (1 st fiber layer 2 a) and the back surface (2 nd fiber layer 2 b) of the front sheet 2 were determined by calculating the average of five void ratios. By comparing the void ratio, the distance between fibers can be determined. That is, when the porosity is large, the distance between fibers can be regarded as large. For example, the void ratio is 25.4% on the skin surface side (the 1 st fiber layer 2a: e.g., a surface of Cotton 100%) which is the front surface of the topsheet 2, and is 24.5% on the non-skin surface side (the 2 nd fiber layer 2b: e.g., a surface of Cotton60% + synthetic fibers 40%).

Further, in compliance with JIS L1015: "a7.1.1 of" a7.1 measurement of fiber length "of appendix a of 2010" method of measuring the length of individual fibers on a glass plate with a scale of the a method (standard method) "to measure the fiber length and the average fiber length of the fibers of a sheet such as a fiber layer. The above method is a test method corresponding to ISO 6989 issued in 1981.

The basis weight of a sheet such as a fiber layer was measured according to the following measurement method. A fiber layer corresponding to one layer was prepared, and the fiber layer was cut into a size of 5cm × 5cm to prepare a sample, and dried in an atmosphere of 100 ℃ or higher to measure the mass. Then, the weight per unit area of the sample was calculated by dividing the measured mass by the area of the sample. The weight per unit area of the sheet was determined as the average of the weights per unit area of the 10 samples.

Further, the thickness of a sheet such as a fiber layer was measured in accordance with the following measurement method. An enlarged image in a direction perpendicular to the cross-section of the surface sheet 2 was taken using a digital microscope VHX-100 manufactured by keyence corporation. The magnified image is an image magnified to a magnification at which the entire surface sheet 2 in the thickness direction T can be captured, and the magnification is, for example, 20 to 50 times. The thickness of each fiber layer is measured in a 2D image converted from the resulting 3D image. The average of the thicknesses measured in the cutting planes at the different points 3 was taken as the thickness of the surface sheet 2.

The fiber density of a sheet such as a fiber layer is measured, for example, according to the following measurement method.

(1) The surface sheet 2 was cut into a size of 10mm × 10mm to obtain a sample. (2) The cross-section parallel to the thickness direction T of the sample was observed under magnification using a scanning electron microscope (JCM-5100, manufactured by Nippon electronics Co., ltd.). The magnification is a magnification (for example, 150 to 500 times) at which the cross section of 30 to 60 fibers can be measured in one screen. (3) The observation area was trisected in the thickness direction T into a skin surface side layer, an intermediate layer, and a non-skin surface side layer, and the number of cross sections of the fibers in each fiber layer was measured with the skin surface side layer being the 1 st fiber layer 2a and the non-skin surface side layer being the 2 nd fiber layer 2b. That is, the number of sections of the cut fiber is counted in a predetermined area of the cut plane. (4) The number of cross sections of the obtained fibers was converted to 1mm per unit ² The number of cross sections of the fiber and the fiber density (root/mm) ² ). The measurement is carried out at 3 and the average of the measurements is taken as the fiber density of the sample. That is, the density of the number of fibers is used as the fiber density. In other words, the number of fibers per unit area in a cross section parallel to the thickness direction T is used as the fiber density. The number of fibers per unit volume may be used as the fiber density. The number of fibers per unit volume can be determined by analysis, for example, by X-ray CT. The fiber density per unit area and the fiber density per unit volume are different in numerical value, but the relative comparison of the fiber densities between fiber layers (exemplified: comparison of the sizes) is the same.

Next, an example of a method for manufacturing the sanitary napkin 1 according to the present embodiment will be described.

Fig. 5 is a schematic diagram showing a configuration example of a device 300 for manufacturing the sanitary napkin 1, and fig. 6 is a diagram schematically illustrating a method for manufacturing the sanitary napkin 1. The manufacturing apparatus 300 has a conveyance direction MD, a transverse direction CD, and a vertical direction TD, in connection with conveyance of a material such as a sheet or a semi-finished product. In the present embodiment, the material and the semi-finished product have the same longitudinal direction, the same width direction, and the same thickness direction as the conveyance direction MD, the transverse direction CD, and the vertical direction TD.

First, a 2 nd web P11 corresponding to the 2 nd fiber layer 2b is formed by the 1 st carding machine 110. First card 110 is a dry roller card (roller card) using a single cylinder card (single card) or a double cylinder card (double card) which are generally used for forming a web. The 2 nd web P11 contains water-retentive fibers and hydrophobic fibers. The 2 nd web P11 is conveyed in the conveyance direction MD by a conveying device (not shown). Next, a 1 st web P12 corresponding to the 1 st fiber layer 2a is formed by the 2 nd carding machine 120. No. 2 card 120 is also a dry roller card similar to No. 1 card 110. The 1 st web P12 contains water-retentive fibers. The 1 st web P12 is stacked on the 2 nd web P11 in the course of conveyance by the conveying device. Thereby forming a composite web P13 of a two-layer structure in which the 1 st web P12 and the 2 nd web P11 are laminated. In addition, the ratio of each fiber in each web can be controlled according to the ratio of the raw material fiber supplied to each carding machine.

Next, the composite fiber web P13 having the double-layer structure is subjected to water jet treatment by the water jet treatment machine 130 to interlace fibers. Thereby forming a 1 st continuous sheet (spunlace nonwoven) P14. Here, the water jet treatment is a treatment in which the composite fiber web P13 is placed on a continuously moving mesh belt and water jet is injected at high pressure from the upper surface side of the composite fiber web P13 to interlace fibers. The properties of the 1 st continuous sheet P14 obtained by the water jet treatment can be appropriately adjusted and changed depending on the mass of each fiber web, the hole diameter of the jet nozzles, the number of holes (pitch) of the jet nozzles, the passing speed of the fiber web, the uneven shape of the mesh belt, and the like. Thereafter, the 1 st continuous sheet P14 having passed through the water jet processing machine 130 is dried by the dryer 140. The dried 1 st continuous sheet P15 is conveyed in the conveyance direction MD by the conveying device.

The method of forming the web corresponding to each fiber layer is not limited to the above-described method, and for example, a wet method or the like can be used. The method of interlacing the web is not limited to the above-described method, and for example, water-jet interlacing, a hot air method, a needle punching method, or the like can be used. The 1 st continuous sheet P15 may be manufactured in a manufacturing plant different from the manufacturing plant of the sanitary napkin 1 and may be supplied to the manufacturing plant of the sanitary napkin 1 in a rolled state.

Next, the 1 st continuous sheet P16, which is the 1 st continuous sheet P15 conveyed by a conveying device (not shown) or unwound from a roll (not shown), is supplied to the shaping device 210. Here, the shaping device 210 includes shaping rollers 210a and 210b, and the shaping rollers 210a and 210b have concave and convex portions extending in the circumferential direction on the outer circumferential surface and engaging with each other. Then, the 1 st continuous sheet P16 is nipped between the uneven portions of the shaping rollers 210a and 210b, and an uneven structure extending in the conveyance direction MD is provided to the 1 st continuous sheet P16. Heating may also be performed during the shaping process. Thereby forming a continuous surface sheet P16 for the surface sheet 2.

Next, the continuous auxiliary sheet AS for the auxiliary sheet 5 unwound from the material roll WR3 is supplied to the heating device 220. Next, the continuous auxiliary sheet AS is heat-treated to be fluffed, and then supplied to the coating device 302. Then, an adhesive (hot melt adhesive, for example) is applied in a predetermined pattern (spiral pattern, for example) to one surface of the continuous auxiliary sheet AS. Thereafter, the continuous auxiliary sheet AS and the continuous-surface sheet P16 are fed to the joining device 230, and are nipped between the pair of joining rollers 230a, 230b of the joining device 230 to be joined. Thereby, as shown in fig. 5 (a), a continuous surface sheet P17 is formed.

Subsequently, the continuous-surface sheet P17 is supplied to the coating device 303. Next, the continuous-surface sheet P17 is coated with an adhesive (hot melt adhesive, for example) in a predetermined pattern along the conveyance direction MD on a surface below (the continuous auxiliary sheet AS of) the continuous-surface sheet P17 in the vertical direction TD and at an end in the transverse direction CD. Next, the continuous surface sheet P17 is supplied to the loop forming device 240. Then, both end portions in the transverse direction CD of the continuous auxiliary sheet AS of the continuous surface sheet P17 are folded back into a loop toward the central portion by a folding jig such AS a flap of the loop forming device 240. As a result, a pair of side portions ASL, ASL corresponding to the pair of ring portions 5L, 5L are formed on both sides of the continuous surface sheet P17 in the transverse direction CD. Thereby, as shown in fig. 5 (b), a continuous surface sheet P18 is formed.

Subsequently, the continuous side sheet SS for the side sheet 6 unwound from the material roll WR4 is supplied to the cutting device 250. Then, the continuous side sheet SS is cut in the transverse direction CD in half along the conveyance direction MD at the center position in the transverse direction CD to form a pair of continuous side sheets SSa, SSb adjacent to each other in the transverse direction CD. Thereafter, the pair of continuous side pieces SSa, SSb are supplied to the pair of coating devices 303a, 303 b. Then, an adhesive (exemplified by a hot-melt adhesive) is applied in a predetermined pattern (exemplified by a stripe pattern) to the inner end portions in the transverse direction CD of each of the pair of continuous side sheets SSa, SSb. Next, the pair of continuous side sheets SSa, SSb and the continuous surface sheet P18 are supplied to the joining device 260, and are sandwiched between the pair of joining rollers 260a, 260b of the joining device 260 to be joined. Thereby, the pair of side portions ASL, ASL of the continuous surface sheet P18 are joined to the pair of continuous side sheets SSa, SSb, respectively. Thereby, as shown in fig. 5 (c), the continuous surface sheet P2 is formed.

Next, the continuous surface sheet P2 is supplied to the application device 305, and an adhesive (hot melt adhesive, for example) is applied in a predetermined pattern to the surfaces of the continuous side sheets SSa and SSb. Next, the continuous-surface sheet P2 and the absorbent bodies P3 aligned in the conveyance direction MD at predetermined intervals are supplied to the joining device 270. Then, the continuous surface sheet P2 and the absorbent body P3 are nipped between a pair of joining rollers 270a, 270b of the joining device 270 and joined. Thereby forming a semi-finished product P4. Subsequently, the semi-finished product P4 is supplied to the compression device 280. In the compression device 280, an emboss roller 280a having a convex portion for compression on the outer peripheral surface is disposed to face an anvil roller 280 b. Then, the half product P4 is nipped between the emboss roller 280a and the anvil roller 280b to be compressed. As a result, compressed portions 11 to 15 extending from the continuous topsheet P2 to the absorbent body P3 in the vertical direction TD are formed, thereby forming the semi-finished product P5. Further, each compression unit may be compressed by a different compression device. Subsequently, the continuous back sheet BS for the back sheet 3 is supplied from the material roller WR4 to the joining device 290. An adhesive (hot melt adhesive, for example) is applied to one surface of the continuous back sheet BS by the application device 306. On the other hand, the semi-finished product P5 is supplied to the joining device 290. Then, the continuous back sheet BS and the semi-finished product P5 are nipped between a pair of joining rollers 290a, 290b of the joining device 290 for joining. As a result, as shown in fig. 5 (d), a blank P6 is formed by stacking the continuous back sheet BS and the blank P5 in the vertical direction TD. Thereafter, the adhesive-attached release sheet CT (fixing portions 7, 8) is joined to the semi-finished product P6, and the peripheral portion of the semi-finished product P6 to which the release sheet CT is joined is cut into the shape of the sanitary napkin 1, thereby forming the sanitary napkin 1.

The sanitary napkin 1 was produced in the manner described above.

(embodiment 2)

Hereinafter, differences from the sanitary napkin 1 according to embodiment 1 will be mainly described with respect to the sanitary napkin 1 according to embodiment 2. Fig. 7 to 8 are views showing configuration examples of the sanitary napkin 1 according to the embodiment. Fig. 7 is a plan view showing a state where the sanitary napkin 1 is unfolded, and fig. 8 is a sectional view taken along line VIII-VIII of fig. 7. The sanitary napkin 1 of the present embodiment is different from the sanitary napkin 1 of embodiment 1 in that a pair of three-dimensional gathers 16 and 16 are provided at the inner end portions in the width direction W of a pair of side sheets 6 and 6, and a pair of loop portions 5L are not present at both end portions in the width direction W of the auxiliary sheet 5. The following description will be specifically made.

The pair of side sheets 6, 6 are provided corresponding to both end portions of the auxiliary sheet 5 in the width direction W, respectively, and are positioned on the skin side of the both end portions, and the pair of side sheets 6, 6 include a pair of three-dimensional gathers 16, 16. The pair of three-dimensional gathers 16, 16 are provided corresponding to the pair of side sheets 6, respectively, and are located at both end portions of the pair of side sheets 6, 6 facing the inside in the width direction W. In other words, the pair of three-dimensional gathers 16, 16 are arranged on both sides of the auxiliary sheet 5 in the width direction W along the longitudinal direction L. The pair of three-dimensional gathers 16, 16 have outer ends in the width direction W as fixed ends 16E1 (inner ends in the width direction W of the portions joined to the auxiliary sheet 5) and inner ends as free ends 16E2 (ends not joined to members such as the top sheet 2 and the auxiliary sheet 5). The three-dimensional gather 16 has an elastic member 16a extending in the longitudinal direction L at the free end 16E 2. However, the three-dimensional gathers 16 may not have an elastic member.

The length between the fixed end 16E1 and the free end 16E2 of the three-dimensional gather 16 in the width direction W is longer than the length between the end 2E of the front sheet 2 in the width direction W and the joint portion end 17, that is, longer than the length of the end region EA in the width direction W. This makes it possible to make the height of the three-dimensional gathers 16 when standing up higher than the height of the end regions EA when standing up. Therefore, even if liquid excrement leaks from the end regions EA, the liquid excrement can be more reliably prevented from leaking from the side of the three-dimensional gathers 16. This can appropriately guide the liquid excrement to the absorbent body 4 while ensuring the tactile sensation to the skin, and can improve the absorption performance.

The top sheet 2 is positioned between the two fixed ends 16E1, 16E1 of one three-dimensional gather 16 and the fixed end 16E1 of the other three-dimensional gather 16 of the pair of three-dimensional gathers 16, separated from each other in the width direction W. That is, in the width direction W, both end edges 2E, 2E in the width direction W of the top sheet 2 are separated from one fixed end 16E1 and the other fixed end 16E1 of the pair of three-dimensional gathers 16, 16.

In the sanitary napkin 1, the topsheet 2 is positioned between the pair of fixed ends 16E1, 16E1 of the pair of three-dimensional gathers 16, 16. Therefore, when body pressure is applied to the top sheet 2, the pair of three-dimensional gathers 16, 16 can suppress leakage of liquid excreta from the top sheet 2 along the side sheet sides. Even if liquid excrement accumulates in the end regions EA, EA on both sides of the topsheet 2 and leaks in the width direction W, the liquid excrement can be further prevented from leaking laterally because the pair of three-dimensional gathers 16, 16 are located at positions separated from the topsheet 2, and the liquid excrement can be absorbed by the auxiliary sheet 5 exposed at the separated positions. This can appropriately guide the liquid excrement to the absorbent body 4 while ensuring the tactile sensation to the skin, and can improve the absorption performance.

The sanitary napkin 1 has end fixing portions 19, 19 for fixing the front and rear ends in the longitudinal direction L of each of the pair of three-dimensional gathers 16, 16 to the front and rear portions of the inner end of the corresponding side sheet 6 of the pair of side sheets 6, 6. The end fixing portions 19, 19 are located outside the both end edges 2E of the front sheet 2 in the width direction W.

The sanitary napkin 1 has end fixing portions 19 for fixing the front and rear ends of the three-dimensional gathers 16 to the front and rear portions of the inner end of the side sheet 6, and the end fixing portions 19 are located outside the end edge 2E of the topsheet 2. That is, both end portions in the longitudinal direction L of the pair of three-dimensional gathers 16, 16 can be fixed without being hindered by the end regions EA, EA on both sides of the top sheet 2 and the rising of the pair of three-dimensional gathers 16, 16. This can further suppress the three-dimensional gathers 16 from falling toward the outside, that is, the liquid excreta reaching the three-dimensional gathers 16 from leaking to the outside.

The absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined, modified, and the like without departing from the object and the gist of the present invention.

Description of the reference numerals

1. Sanitary napkins (absorbent articles); 2. a surface sheet; 3. a back sheet; 4. an absorbent body; 5. an auxiliary sheet; 7. a fixed part; 15. a compression section (hole section); CA. A central region; EA. An end region.

Claims (13)

1. An absorbent article having a longitudinal direction, a width direction and a thickness direction, a front sheet, an auxiliary sheet, an absorber, a back sheet and a fixing portion being laminated in this order in the thickness direction,

a dimension in the width direction of the surface sheet is smaller than a dimension in the width direction of the auxiliary sheet,

the top sheet has a central region located at the center in the width direction and extending from one end to the other end of the absorbent article in the longitudinal direction, and a pair of end regions adjacent to both outer sides of the central region in the width direction and extending from one end to the other end of the absorbent article in the longitudinal direction, the central region being joined to the auxiliary sheet, the pair of end regions being not joined to the auxiliary sheet,

the central region of the surface sheet has a plurality of hole portions,

the auxiliary sheet is not joined to another member except for a portion overlapping the central region in the width direction.

2. The absorbent article of claim 1,

the central region and the pair of end regions of the surface sheet have a plurality of fine holes,

the area of each of the pores present in the pair of end regions is smaller than the area of each of the pores present in the central region in a plan view.

3. The absorbent article of claim 2, wherein,

in the surface sheet, the area of the pores in the central region and the pair of end regions is 0.01mm in plan view ² Above and 25mm ² The following.

4. The absorbent article according to claim 2 or 3, wherein,

in a plan view of the device,

the shape of the pores present in the pair of end regions is a shape in which the dimension in the width direction is shorter than the dimension in the length direction.

5. The absorbent article according to any one of claims 1 to 3,

the surface sheet is formed of a nonwoven fabric, and among fibers constituting the nonwoven fabric, fibers present in the end regions are oriented along the longitudinal direction more than fibers present in the central region.

6. The absorbent article according to any one of claims 1 to 3,

the absorbent article further includes a pair of side sheets provided corresponding to both ends in the width direction of the auxiliary sheet and located on a non-skin side of the both ends,

the auxiliary sheet has a pair of hollow winding three-dimensional portions provided corresponding to both end portions of the auxiliary sheet in the width direction and configured to wind the both end portions toward a non-skin surface side of the auxiliary sheet,

the end portion in the width direction of the auxiliary sheet at each of the pair of hollow roll-in solid portions is joined to an inner end portion in the width direction of the side sheet corresponding to the end portion of the pair of side sheets by a joining portion.

7. The absorbent article of claim 6, wherein,

in the pair of hollow roll-in solid portions, a dimension of a portion outside the joint portion is larger than a dimension of a portion outside the joint portion in the pair of end portions in the width direction in a plan view.

8. The absorbent article of claim 6,

the absorbent article has end fixing portions for fixing respective front and rear end portions in the longitudinal direction of the pair of hollow roll-in three-dimensional portions to front and rear portions of inner end portions of corresponding side sheets in the pair of side sheets,

the end fixing portions are located outside both end edges of the front surface sheet in the width direction.

9. The absorbent article of claim 6, wherein,

the absorbent article further includes a pair of compressed sections formed in a region where the top sheet and the absorbent body overlap in the thickness direction,

the pair of compressed parts respectively reach from the position of the front surface sheet to a position deeper than the joint part toward the non-skin surface side in the thickness direction.

10. The absorbent article according to any one of claims 1 to 3,

the absorbent article further includes a pair of side pieces provided corresponding to both ends in the width direction of the auxiliary sheet and located on a skin side of the both ends,

the pair of side sheets has a pair of three-dimensional gathers provided respectively corresponding to the pair of side sheets and located at both end portions of the pair of side sheets facing the inner side in the width direction,

the pair of three-dimensional gathers each having a fixed end at an outer end and a free end at an inner end in the width direction,

the surface sheet is located between the fixed ends of one of the pair of three-dimensional gathers and the other of the pair of three-dimensional gathers, separately from the fixed ends in the width direction.

11. The absorbent article of claim 10,

the absorbent article has end fixing portions for fixing respective front and rear ends in the longitudinal direction of the pair of three-dimensional gathers to portions in front of and behind inner end portions of corresponding side sheets in the pair of side sheets,

the end fixing portions are located outside both end edges of the front surface sheet in the width direction.

12. The absorbent article according to any one of claims 1 to 3,

the surface sheet contains water-retentive fibers.

13. The absorbent article of claim 12,

the surface sheet has a drain opening abutment region in the central region,

the excretory opening contact region contains a weak water-repellent oil agent.

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