CN109789046B

CN109789046B - Absorbent article

Info

Publication number: CN109789046B
Application number: CN201680089304.7A
Authority: CN
Inventors: 藤川久实; 野口顺一
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2016-09-16
Filing date: 2016-09-16
Publication date: 2020-09-25
Anticipated expiration: 2036-09-16
Also published as: JP6275364B1; KR102346040B1; WO2018051519A1; CN109789046A; JPWO2018051519A1; KR20190053185A

Abstract

The invention provides an absorptive article which is not easy to generate foreign body feeling, has poor appearance and excellent wearing feeling. The absorbent article of the present invention includes a liquid-permeable sheet in which a 1 st nonwoven fabric layer (2) and a 2 nd nonwoven fabric layer (3) are joined together at a joint (7), wherein the 1 st nonwoven fabric layer (2) has a specific uneven structure (20) formed by alternately arranging raised strips (21) and recessed grooves (22) that extend continuously in a predetermined 1 st direction along a 2 nd direction orthogonal to the 1 st direction, and the absorbent article includes: a circular arc seal portion formed of a 1 st embossed portion (8), the 1 st embossed portion (8) being disposed at a position inwardly spaced from an outer peripheral edge portion of the absorbent article; and a 2 nd embossed portion (9) which is arranged between a 1 st outer peripheral edge portion extending in a direction parallel to the 1 st direction and the arc seal portion, and which has a smaller plan view area than a plan view area of the 1 st embossed portion (8).

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a panty liner, a light incontinence pad, a sanitary napkin, or the like.

Background

In absorbent articles such as sanitary pads, light incontinence pads, and sanitary napkins, the ability to quickly absorb liquid excretions such as urine and menstrual blood and keep them from leaking to the outside has been demanded, and in recent years, in addition to such ability, excellent skin touch, fit to the body of the wearer, and wearing feeling have been demanded.

For example, patent document 1 discloses an absorbent article formed by overlapping a plurality of sheets and having left and right side edge portions extending in a longitudinal direction, a front edge portion and a rear edge portion, wherein a plurality of pressure-bonding sections of group 1 are provided inside the side edge portions within a range of a predetermined length extending in the longitudinal direction across a transverse center line dividing the absorbent article into two parts in the longitudinal direction, the plurality of pressure-bonding sections of group 1 are arranged in a row at predetermined intervals in conformity with the shape of the side edge portions, and non-pressure-bonding regions extending in the arrangement direction of the plurality of pressure-bonding sections are provided on both sides of the row formed by the pressure-bonding sections. If a plurality of pressure-bonding sections such as the arc-shaped seal sections are provided inside the outer peripheral edge section of the absorbent article, as in the absorbent article disclosed in patent document 1, the pressure-bonding sections having a relatively high hardness are less likely to come into contact with the skin surface of the wearer's thighs and the like, and therefore, there is an advantage that a foreign body sensation or the like due to the pressure-bonding sections is less likely to be given to the wearer.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2004-8596

Disclosure of Invention

Problems to be solved by the invention

On the other hand, in order to improve the softness and the tactile sensation of the absorbent article and obtain more excellent wearing feeling, the following techniques have been studied: a specific liquid-permeable sheet is used as a topsheet of an absorbent article, the sheet being formed of a 1 st nonwoven fabric and a 2 nd nonwoven fabric, the 1 st nonwoven fabric having a concavo-convex structure in which a ridge portion protruding toward a skin-facing surface in a thickness direction of the absorbent article and continuously extending in a 1 st direction and a groove portion recessed toward a non-skin-facing surface side in the thickness direction and continuously extending in the 1 st direction are alternately arranged in a 2 nd direction orthogonal to the predetermined 1 st direction, the 2 nd nonwoven fabric being adjacent to the non-skin-facing surface of the 1 st nonwoven fabric, and at least a part of the groove portion of the 1 st nonwoven fabric being joined to the 2 nd nonwoven fabric, and the skin-facing surface of the absorbent article being formed by the ridge portion and the groove portion.

However, when such a technique is applied to the absorbent article disclosed in patent document 1, since the plurality of pressure-bonding sections such as the circular arc seal sections are provided inside the outer peripheral edge section of the absorbent article, at least a part of the end section of the 1 st nonwoven fabric is formed as a free end (i.e., an unfixed end section) at the outer peripheral edge section of the end section in the 2 nd direction orthogonal to the 1 st direction in which the convex strip of the front surface sheet extends (particularly, in the case where the outer peripheral edge section of the end section in the 2 nd direction is formed in a curved shape) of the outer peripheral edge section of the absorbent article, and if the end section protrudes outward in the skin-facing surface side or in the planar direction of the absorbent article (see fig. 4), there is a possibility that the wearer is given a feeling of foreign matter, and the wearing feeling is reduced, and the appearance of the absorbent article is deteriorated.

Accordingly, an object of the present invention is to provide an absorbent article which is less likely to cause the above-described foreign body sensation, poor appearance, and excellent wearing sensation.

Means for solving the problems

One aspect of the present invention (aspect 1) is an absorbent article including: a liquid-permeable sheet formed by joining a first nonwoven fabric layer 1 forming a skin-facing surface and a second nonwoven fabric layer 2 adjacent to a non-skin-facing surface of the first nonwoven fabric layer at a joint; and a liquid-impermeable sheet positioned closer to the skin-non-facing surface side than the liquid-permeable sheet,

the 1 st nonwoven fabric layer has a concavo-convex structure in which a projected line portion projecting toward the skin-facing surface side in the thickness direction of the absorbent article and continuously extending in the 1 st direction and a groove portion recessed toward the non-skin-facing surface side in the thickness direction and continuously extending in the 1 st direction are alternately arranged in the 2 nd direction orthogonal to the predetermined 1 st direction, and at least a part of the groove portion is joined to the 2 nd nonwoven fabric layer at the joining portion,

the 1 st nonwoven fabric layer is formed of a nonwoven fabric capable of forming the raised strip portions, the length of the nonwoven fabric layer in the 2 nd direction being longer than the length of the nonwoven fabric layer in the 2 nd direction in the stretched state,

the absorbent article includes:

a circular arc seal portion formed by a 1 st embossed portion, the 1 st embossed portion being disposed at least partially along an outer peripheral edge portion of the absorbent article at a position inwardly spaced from the outer peripheral edge portion, and the liquid-permeable sheet and the liquid-impermeable sheet being integrated in the thickness direction; and

and a 2 nd embossed portion which is disposed between the 1 st outer peripheral edge portion of the outer peripheral edge portions extending in a direction parallel to the 1 st direction and the arc seal portion, and which has a smaller plan view area than a plan view area of the 1 st embossed portion.

The absorbent article according to claim 1 includes the 2 nd embossed portion which is disposed between the 1 st outer peripheral edge portion of the outer peripheral edge portion, which extends in the direction parallel to the 1 st direction, and the circular arc seal portion, and which has a smaller plan view area than the 1 st embossed portion of the circular arc seal portion, so that the 2 nd embossed portion can suppress a state in which an end portion of the 1 st nonwoven fabric layer in the vicinity of the outer peripheral edge portion of the absorbent article is curled up to protrude toward the skin-facing surface side or protrude outward in the plane direction, and a foreign body sensation and a poor appearance due to the protrusion of the end portion are less likely to occur.

In the absorbent article according to claim 1, since the 2 nd embossed portion has a smaller plan view area than the plan view area of the 1 st embossed portion of the arc seal portion, even if the 2 nd embossed portion comes into contact with the skin surface of the wearer's thighs or the like, the wearer does not easily feel the stiffness thereof (i.e., the wearer is not easily given a feeling of foreign matter), and the excellent wearing feeling achieved by the liquid-permeable sheet having the specific concavo-convex structure can be favorably maintained.

In the absorbent article according to claim 1, in another aspect of the present invention (claim 2), the raised strip has a hollow internal structure.

In the absorbent article according to claim 2, since the raised strips of the 1 st nonwoven fabric layer have a hollow internal structure, good cushioning properties and a softer skin feel can be obtained, and a more excellent wearing feel can be obtained as the absorbent article.

In the absorbent article according to claim 1 or 2 (claim 3), the 2 nd embossed portion is not disposed between the 2 nd outer peripheral edge portion of the outer peripheral edge portion extending in the direction parallel to the 2 nd direction and the circular arc seal portion.

In the absorbent article according to claim 3, since the 2 nd embossed portion is not disposed between the 2 nd outer peripheral edge portion of the outer peripheral edge portion extending in the direction parallel to the 2 nd direction and the arc seal portion, a hard portion due to the embossed portion does not exist in the 2 nd outer peripheral edge portion where the protrusion of the end portion of the 1 st nonwoven fabric layer does not easily occur, and the foreign body sensation is less likely to be given to the wearer. Thus, the absorbent article according to claim 3 can more reliably maintain excellent wearing comfort.

In the absorbent article according to any one of claims 1 to 3, according to a further aspect (claim 4) of the present invention, the absorbent article has a longitudinal outer shape having a longitudinal direction and a width direction orthogonal to each other, and the 1 st direction is parallel to the width direction.

In the absorbent article according to claim 4, the 1 st direction in which the raised portions of the 1 st nonwoven fabric layer extend is parallel to the width direction of the absorbent article having a vertically long outer shape, and the 1 st outer peripheral edge portion, at which the end portions of the 1 st nonwoven fabric layer tend to protrude, is the outer peripheral edge portion of the end portions in the longitudinal direction of the absorbent article, so that the end portions of the 1 st nonwoven fabric layer do not easily protrude at the outer peripheral edge portion of the end portions in the width direction of the absorbent article, which is likely to come into contact with the thighs and groin of the wearer, and the foreign body sensation due to the protruding end portions is less likely to occur. Thus, the absorbent article according to claim 4 can more reliably maintain the above-described excellent wearing feeling.

In addition, in the case where the absorbent article of claim 4 further includes the configuration of claim 3, since the 2 nd embossed portion is not disposed between the 2 nd outer peripheral edge portion of the end portion in the width direction of the absorbent article and the circular arc seal portion, the absorbent article does not have a portion having a high hardness due to the embossed portion at the 2 nd outer peripheral edge portion of the end portion in the width direction of the absorbent article which is likely to come into contact with the thigh portion and the inguinal portion of the wearer, and the wearer is more reliably less likely to be given a feeling of foreign matter.

According to any one of the absorbent articles according to claims 1 to 4, in still another aspect (claim 5) of the present invention, the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are joined together at the joint portion with an adhesive, and an adhesive non-existing region where the adhesive is not present is provided between the outer peripheral edge portion and the arc seal portion.

In the absorbent article according to claim 5, since the adhesive-free region where no adhesive is present for bonding the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer together is provided between the outer peripheral edge portion and the circular arc seal portion, the wearer is less likely to feel the hardness of the bonded portion formed by the adhesive in the vicinity of the outer peripheral edge portion that is likely to come into contact with the skin surface of the wearer, and the wearer can be less likely to feel a foreign body sensation or the like.

In the absorbent article according to any one of claims 1 to 5, in a further aspect (claim 6) of the present invention, the 1 st nonwoven fabric layer has a thickness larger than a thickness of the 2 nd nonwoven fabric layer.

In the absorbent article according to claim 6, since the 1 st nonwoven fabric layer has a thickness larger than that of the 2 nd nonwoven fabric layer, the 1 st nonwoven fabric layer can ensure a restoring force of the raised strip portions against compression in the thickness direction, and can exhibit a higher cushioning performance. In addition, when a nonwoven fabric having a large restoring force of the raised portions is used for the first nonwoven fabric layer 1, the end portions of the first nonwoven fabric layer 1 are generally likely to be rolled up and project toward the skin-facing surface side or project outward in the planar direction, but since the absorbent article according to claim 6 includes the second embossed portion 2, such projection of the end portions of the first nonwoven fabric layer 1 can be suppressed.

Therefore, the absorbent article according to claim 6 can exhibit a higher cushioning performance and is less likely to cause a feeling of foreign matter and a poor appearance due to the protrusion of the end portions.

According to any one of the absorbent articles of claims 1 to 6, in a further aspect (claim 7) of the present invention, the 2 nd embossed portion is disposed at a position overlapping at least the 1 st outer peripheral edge portion in a plan view.

In the absorbent article according to claim 7, since the 2 nd embossed portion is disposed at a position overlapping at least the 1 st outer peripheral edge portion, the portion of the 1 st nonwoven fabric layer which becomes a free end in the vicinity of the outer peripheral edge portion of the absorbent article can be reduced by the 2 nd embossed portion, and the state in which the end portion of the 1 st nonwoven fabric layer is curled up to protrude toward the skin-facing surface side or protrude outward in the planar direction can be more reliably suppressed. Thus, the absorbent article according to claim 7 can be more resistant to the occurrence of a foreign body sensation and appearance defects due to the protrusion of the end portions.

According to any one of the absorbent articles according to claims 1 to 7, in a further aspect (claim 8) of the present invention, the 1 st outer peripheral edge portion has an outer shape curved so as to protrude outward in the 2 nd direction in a plan view, and the 2 nd embossed portion is arranged along the outer shape of the 1 st outer peripheral edge portion.

In the absorbent article according to claim 8, since the 2 nd embossed portion is arranged along the curved outer shape of the 1 st outer peripheral edge portion of the absorbent article, even in an absorbent article having an outer shape in which the end portion of the 1 st nonwoven fabric layer is easily formed into a free end (i.e., an outer shape in which the 1 st outer peripheral edge portion is curved so as to protrude outward in the 2 nd direction in a plan view), it is possible to more reliably suppress the above-described state in which the end portion of the 1 st nonwoven fabric layer is curled up to protrude outward in the skin-facing surface or protrude outward in the planar direction. Thus, the absorbent article according to claim 8 can more reliably prevent the foreign body sensation and the appearance defect caused by the protrusion of the end portion.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide an absorbent article which is less likely to cause the above-described foreign body sensation, has a poor appearance, and has an excellent wearing sensation.

Drawings

Fig. 1 is a partially cut-away perspective view of a panty liner 1 according to an embodiment of the invention.

Fig. 2 is a top view of a panty liner 1 according to an embodiment of the invention.

Fig. 3 is a partial cross-sectional view of a panty liner 1 according to an embodiment of the invention, taken along the line III-III in fig. 2.

Fig. 4 is a partial cross-sectional view corresponding to fig. 3 of a panty liner 1' without the 2 nd embossed portion.

Fig. 5 is an enlarged top view of the main portion of a pantiliner according to another embodiment of the present invention.

Fig. 6 is a top view of a pantiliner 10 in accordance with yet another embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, unless otherwise specified, the phrase "observing an object (for example, an absorbent article, a topsheet (liquid-permeable sheet), or the like) placed on a horizontal plane in a developed state from the vertically upper side along the thickness direction of the object" will be simply referred to as "looking down".

Unless otherwise specified, various directions and the like used in the present specification are as follows.

In the present specification, "the longitudinal direction" means a direction in which the length of a long object (for example, an absorbent article, a topsheet (liquid-permeable sheet), or the like) is long in a plan view, "the width direction" means a direction in which the length of the long object is short in a plan view (short-side direction), "and" the thickness direction "means a direction perpendicular to an object placed on a horizontal plane in an unfolded state. The longitudinal direction, the width direction and the thickness direction are all in a mutually orthogonal relationship. In the present specification, the "planar direction" refers to a direction (i.e., a horizontal plane direction) in which a plane of a substantially sheet-like object (e.g., an absorbent article, a topsheet (liquid-permeable sheet), etc.) extends in a plan view, and the planar direction and the thickness direction are in a perpendicular relationship with each other.

In the present specification, the phrase "a longitudinal central axis C extending in the width direction and located at the center of a longitudinal object in the longitudinal direction of the object and relatively close to the object in the longitudinal direction_WThe proximal side of (a) is referred to as "inner side in the longitudinal direction", and "is relatively distant from the longitudinal central axis C in the longitudinal direction of the longitudinal object_WThe distal side of (a) is referred to as "the outer side in the width direction". Similarly, "a widthwise central axis C extending in the longitudinal direction and located at the center in the widthwise direction of a vertically long object is relatively close to_LThe proximal side of (a) is referred to as "inner side in the width direction", and "is relatively distant from the width direction central axis C in the width direction of the longitudinal object_LThe distal side of (a) is referred to as "the outer side in the width direction". In the present specification, the phrase "relatively close to the longitudinal central axis C of a substantially sheet-like object in the planar direction of the object_WAnd a width direction central axis C_LThe proximal side of the intersection of (A) is referred to as "inner side in the plane direction", and "is relatively distant from the longitudinal central axis C of the substantially sheet-like object in the plane direction thereof_WAnd a width direction central axis C_LThe distal side of the intersection of (a) is referred to as "the outer side in the plane direction".

In the present specification, unless otherwise specified, "the proximal side of the absorbent article that is relatively close to the skin surface of the wearer when worn" is referred to as "the skin surface side", and "the distal side of the absorbent article that is relatively distant from the skin surface of the wearer when worn" is referred to as "the non-skin surface side", in the thickness direction of the absorbent article. Here, "worn" refers to a period (wearing period) during which the absorbent article is maintained from the time when the wearer wears the absorbent article (i.e., the time when the absorbent article is in a usable state).

In the present specification, the "skin-facing surface" of each of the various members (for example, a front sheet (liquid-permeable sheet), a back sheet (liquid-impermeable sheet), and the like) constituting the absorbent article is simply referred to as a "skin-facing surface", and the "non-skin-facing surface" is simply referred to as a "non-skin-facing surface".

Fig. 1 is a partially cut-away perspective view of a panty liner 1 according to an embodiment of the invention, fig. 2 is a top view of the panty liner 1, and fig. 3 is a partially cut-away view of the panty liner 1 along the line III-III in fig. 2.

As shown in fig. 1 and 2, a sanitary pad 1 according to an embodiment of the present invention has a longitudinal outer shape having a longitudinal direction L and a width direction W in a plan view, and more specifically, the sanitary pad 1 has the following longitudinal outer shape: outer peripheral edges (1 st outer peripheral edge E in fig. 1 and 2) located at both ends in the longitudinal direction L₁) Each is curved so as to protrude outward in the longitudinal direction L, and a substantially central portion in the longitudinal direction L is slightly narrowed inward in the width direction W.

In the present invention, the outer shape of the absorbent article is not limited to such a shape, and any outer shape (for example, a rectangular shape, an oval shape, an hourglass shape, etc.) can be adopted according to various uses and the like.

As shown in fig. 1 to 3, the pantiliner 1 of the present embodiment includes, as basic structures, in the thickness direction T: a top sheet 4 formed of a liquid-permeable sheet located on the skin-facing surface side Da of the sanitary pad 1 and including a 1 st nonwoven fabric layer 2 having a specific uneven structure 20 described later and a 2 nd nonwoven fabric layer 3 laminated on the 1 st nonwoven fabric layer 2; a back sheet 6 formed of a liquid-impermeable sheet positioned on the non-skin-facing surface side Db of the sanitary pad 1; and an intermediate sheet 5 positioned between the front sheet 4 and the back sheet 6, wherein a surface on the skin-facing surface side Da of the front sheet 4 (i.e., the skin-facing surface) forms the skin-facing surface of the sanitary pad 1, and a surface on the non-skin-facing surface side Da of the back sheet 6 (i.e., the non-skin-facing surface) forms the non-skin-facing surface of the sanitary pad 1.

In the present embodiment, the front sheet 4 and the intermediate sheet 5 and the back sheet 6 are bonded to each other with an adhesive layer (not shown) made of a hot-melt adhesive.

As shown in fig. 3, the back sheet 6 has an adhesive portion 12 for fixing to clothing on the non-skin-facing surface thereof, the adhesive portion 12 for fixing to clothing is formed by arranging a plurality of adhesive agents extending continuously in the width direction W in a row along the longitudinal direction L (so-called stripe pattern), and the adhesive portion 12 has a release sheet 11 on the surface on the non-skin-facing surface side thereof, the release sheet 11 being arranged to cover substantially the entire surface of the back sheet 6 on the non-skin-facing surface side thereof and to protect the adhesive portion 12 before use. The sanitary pad 1 configured as described above is worn as follows: the release sheet 11 is peeled off when worn, and the sanitary pad 1 is fixed to the inner surface of clothing (e.g., underwear) of a wearer by the adhesive portion 12 for fixing to the clothing, which is disposed on the non-skin-facing surface of the back sheet 6, so that the front sheet 4 faces the skin of the wearer.

The pressure-sensitive adhesive forming the pressure-sensitive adhesive portion is not particularly limited as long as the absorbent article can be fixed to clothing of a wearer, and any pressure-sensitive adhesive containing a styrene-based polymer or the like can be used, for example. The arrangement pattern of the adhesive is not particularly limited, and the adhesive may extend intermittently in the width direction W, or may extend continuously or intermittently in the longitudinal direction L.

In the sanitary pad 1 of the present embodiment, as shown in fig. 3, the top sheet 4 is formed of a liquid-permeable sheet in which a 1 st nonwoven fabric layer 2 forming the skin-facing surface of the sanitary pad 1 and a 2 nd nonwoven fabric layer 3 adjacent to the non-skin-facing surface of the 1 st nonwoven fabric layer 2 are joined together at a joining portion 7, and the 1 st nonwoven fabric layer 2 has ridges 21 and grooves 22 along a 2 nd direction D corresponding to the longitudinal direction L of the sanitary pad 1₂The uneven structure 20 is formed by alternately arranging the convex strip 21 toward the skin-facing surface side in the thickness direction T of the sanitary pad 1Projected along the 1 st direction D corresponding to the width direction W of the sanitary pad 1₁Continuously extending, the groove portion 22 being recessed toward the non-skin-facing surface side in the thickness direction T and extending along the 1 st direction D₁Continuously extends and at least a part of the groove portion 22 is joined together with the 2 nd nonwoven fabric layer 3 at the joining portion 7. The 1 st nonwoven fabric layer 2 is stretched in the 1 st direction D₁Has a length longer than the 1 st direction D of the 2 nd nonwoven layer 3₁The length of the convex strip 21 is larger than the length of the non-woven fabric.

As shown in fig. 1 to 3, the sanitary pad 1 includes: arc seal part R_SA 1 st embossed portion 8, which is formed by arranging the 1 st embossed portion 8 along the outer peripheral edge portion of the sanitary pad 1 at a position separated from the outer peripheral edge portion to the inside in the plane direction in a plan view, and integrating the front sheet 4 (liquid-permeable sheet), the intermediate sheet 5, and the back sheet 6 (liquid-impermeable sheet) in the thickness direction T of the sanitary pad 1; and a 2 nd embossed portion 9 disposed in the outer peripheral portion of the sanitary pad 1 along the 1 st direction D₁1 st outer peripheral edge portion E extending in parallel direction (i.e., respectively located at both ends of the pad 1 in the longitudinal direction L and extending in the substantially width direction W)₁And the arc sealing part R_SAnd has a plan view area smaller than the plan view area of the 1 st embossed portion 8.

The sanitary pad 1 of the present embodiment includes the 2 nd embossed portion 9, and the 2 nd embossed portion 9 is disposed in the outer peripheral portion of the sanitary pad 1 along the 1 st direction D₁1 st outer peripheral edge part E extending in parallel direction₁And the arc sealing part R_SAnd has a sealing portion R larger than the arc_SThe 1 st embossed portion 8 has a small plan view area, so that the 2 nd embossed portion 9 can suppress the 1 st nonwoven fabric layer 2 from being located in the vicinity of the outer peripheral edge of the sanitary pad 1 (i.e., the 1 st outer peripheral edge E)₁Near) end portion 24 is rolled up and protrudes toward the skin-facing surface side Da or the outside in the planar direction, and the protrusion of the end portion 24 is less likely to causeThe feeling of foreign matter and the appearance were poor.

In addition, in the sanitary pad 1, the 2 nd embossed portion 9 has a sealing portion R having a larger radius than the arc-shaped sealing portion R_SSince the 1 st embossed section 8 has a small plan view area, even if the 2 nd embossed section 9 is brought into contact with the skin surface of the wearer such as the thigh and the groin, the wearer is less likely to feel the stiffness thereof (i.e., the wearer is less likely to be given a foreign body sensation), and the excellent wearing sensation realized by the liquid-permeable sheet having the specific uneven structure 20 can be maintained satisfactorily.

Here, fig. 4 is a partial cross-sectional view of a sanitary pad 1 ' without the 2 nd embossed portion as described above, corresponding to fig. 3, and in fig. 4, the components other than the 2 nd embossed portion, that is, the 1 st nonwoven fabric layer 2 ', the 2 nd nonwoven fabric layer 3 ', the intermediate sheet 5 ', the back sheet 6 ', the joining portion 7 ', the 1 st embossed portion 8 ', the release sheet 11 ', and the adhesive portion 12 ' are the same as those of the above-described embodiment.

In the pantiliner 1 ' not having the 2 nd embossed portion as described above, as shown in fig. 4, of the outer peripheral edge portion of the pantiliner 1 ', the outer peripheral edge portion E ' of the end portion located in the 2 nd direction (i.e., the longitudinal direction L of the pantiliner 1 ') orthogonal to the 1 st direction in which the projected streaks 21 ' of the 1 st nonwoven fabric layer 2 ' extend '₁(particularly, in the outer peripheral edge portion E'₁In the case of forming a curved shape in plan view), at least a part of the end portion 24 'of the 1 st nonwoven fabric layer 2' is formed as a free end, and the end portion 24 'protrudes outward in the skin-facing surface side or the planar direction of the sanitary pad 1' (the form shown in fig. 4 is a form in which the end portion 24 'protrudes outward in the planar direction of the sanitary pad 1'). ) In some cases, the wearer may feel a foreign body sensation to deteriorate the wearing sensation, or the appearance of the absorbent article may deteriorate.

In the present invention, the outer peripheral edge portion of the absorbent article refers to the outer edge of the outer shape of the absorbent article in plan view, and for example, in the pantiliner 1 of the above-described embodiment, the outer peripheral edge portion of the absorbent article includes the second ends respectively located at both ends in the longitudinal direction L of the pantiliner 11 outer peripheral edge E₁And 2 nd outer peripheral edge portions E located at both end portions in the width direction W, respectively₂. Here, the 1 st outer peripheral edge part E₁In the outer peripheral edge portion of the sanitary pad 1, along the 1 st direction D extending along the projected strip portions 21 of the 1 st nonwoven fabric layer 2₁Outer peripheral edge extending in substantially parallel direction, 2 nd outer peripheral edge E₂In the outer peripheral edge portion of the sanitary pad 1, along the 1 st direction D extending along the convex strip 21 of the 1 st nonwoven fabric layer 2₁ Orthogonal 2 nd direction D₂An outer peripheral edge portion extending in a substantially parallel direction.

In the present invention, the projected strip portion and the recessed portion of the 1 st nonwoven fabric layer are defined such that a portion projecting toward the skin-facing surface is defined as a projected strip portion and a portion recessed toward the non-skin-facing surface is defined as a recessed portion, with reference to a 3 rd imaginary horizontal plane located at the middle of a 1 st imaginary horizontal plane including a highest point of the projected strip portion (i.e., a point located at a position closest to the skin-facing surface in the thickness direction) and a 2 nd imaginary horizontal plane including a lowest point of the recessed portion (i.e., a point located at a position closest to the non-skin-facing surface in the thickness direction) (i.e., a position located at an equal distance from each of the 1 st imaginary horizontal plane and the 2 nd imaginary horizontal plane).

In the present specification, the "plan view area" refers to an area of an external shape (i.e., a plan view shape) of an object viewed in plan view. Therefore, when the 1 st embossing part or the 2 nd embossing part has a circular shape in plan view, the area of the circular shape is the area of the 1 st embossing part or the 2 nd embossing part in plan view. In addition, in the case where the shape of the 1 st embossing part or the 2 nd embossing part in plan view is a shape in which a plurality of geometric figures and the like are combined (that is, a shape in which the geometric figures and the like are continuously connected), the area of the whole combined shape becomes the area in plan view, and in the case where the shape in plan view is a shape in which the plurality of geometric figures and the like are not combined but are integrated (that is, a shape in which the geometric figures and the like are not connected but are integrated), the area of the shape of each geometric figure and the like becomes the area in plan view.

Hereinafter, various members and the like constituting the absorbent article of the present invention will be described in more detail with reference to the pantiliner 1 of the above-described embodiment.

[ surface sheet ]

In the sanitary pad 1 of the present embodiment, as shown in fig. 1 and 3, the top sheet 4 is disposed at a position on the skin-facing surface side Da of the sanitary pad 1 which comes into direct contact with the skin surface of the wearer and is formed of a liquid-permeable sheet, and the 1 st nonwoven fabric layer 2 which forms the skin-facing surface of the sanitary pad 1 and has the above-mentioned specific uneven structure 20 and the 2 nd nonwoven fabric layer 3 adjacent to the non-skin-facing surface of the 1 st nonwoven fabric layer 2 are joined together at the joining portions 7 to form the above-mentioned liquid-permeable sheet.

In the present embodiment, as shown in fig. 1 and 2, the top sheet 4 is positioned at the 1 st outer peripheral edge E of the pantiliner 1 at both ends in the longitudinal direction L in plan view₁And extend in the range between and are respectively positioned at the 2 nd outer peripheral edge part E of the two end parts of the sanitary pad 1 in the width direction W₂The surface sheet 4 has a longitudinal outer shape which is the same as the outer shape of the sanitary pad 1. In the absorbent article of the present invention, the top sheet (liquid-permeable sheet) is not limited to such a shape, and any shape and size in plan view can be adopted.

In the present embodiment, the liquid-permeable sheet used as the top sheet 4 is formed by joining the 1 st nonwoven fabric layer 2 forming the skin-facing surface of the sanitary pad 1 and having the above-described specific uneven structure 20 and the 2 nd nonwoven fabric layer 3 adjacent to the non-skin-facing surface of the 1 st nonwoven fabric layer 2 at the joining portions 7.

As described above, the first nonwoven fabric layer 2 constituting the liquid-permeable sheet has the projected ridges 21 and the recessed grooves 22 along the 2 nd direction D corresponding to the longitudinal direction L of the sanitary pad 1₂A specific uneven structure 20 formed by alternately arranging, wherein the raised strips 21 project toward the skin-facing surface side Da in the thickness direction T of the sanitary pad 1 and extend along the 1 st direction D corresponding to the width direction W of the sanitary pad 1₁Continuously at the same timeExtending in the thickness direction T, the groove portion 22 is recessed toward the non-skin-facing surface side Db and extends along the 1 st direction D₁Continuously extending, at least a part of said groove portion 22 being joined together with the 2 nd nonwoven layer 3 at said joining portion 7.

In the present invention, the specific uneven structure having the raised portions and the recessed portions may be formed in the entire region of the 1 st nonwoven fabric layer as in the present embodiment, or may be formed only in a partial region.

In the present embodiment, as shown in fig. 3, the raised strip portions 21 have hollow portions 23 facing the non-skin-facing surface of the 1 st nonwoven fabric layer 2. Although the case where the ridges of the 1 st nonwoven fabric layer have such a hollow internal structure is not an essential constituent condition in the absorbent article of the present invention, if the ridges of the 1 st nonwoven fabric layer have such a hollow internal structure, good cushioning properties and a softer skin feel can be obtained, and a more excellent wearing feel can be obtained as the absorbent article. On the other hand, if the raised ridges of the 1 st nonwoven fabric layer have a solid internal structure, it is not easy to form a gap between the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer, and the liquid-permeable sheet has good transferability from the skin-facing surface side to the non-skin-facing surface side.

In the present invention, the height of the raised stripe of the 1 st nonwoven fabric layer is not particularly limited as long as the effect of the present invention is not impaired, and is, for example, in the range of 0.01mm to 6.0mm, but is preferably in the range of 0.1mm to 4.0mm, and more preferably in the range of 0.1mm to 3.0mm, from the viewpoint of cushioning properties, skin touch, and the like. Similarly, the depth of the groove portion of the 1 st nonwoven fabric layer is not particularly limited as long as the effect of the present invention is not impaired, and is, for example, in the range of 0.01mm to 6.0mm, but is preferably in the range of 0.1mm to 4.0mm, and more preferably in the range of 0.1mm to 3.0mm from the viewpoint of cushioning properties, skin touch, and the like. In the present specification, the "height of the ridge portion" refers to a height from the 2 nd imaginary horizontal plane as a reference plane to a highest point of the ridge portion (i.e., a distance between the 1 st imaginary horizontal plane and the 2 nd imaginary horizontal plane), and the "depth of the groove portion" refers to a depth from the 1 st imaginary horizontal plane as a reference plane to a lowest point of the groove portion (i.e., a distance between the 1 st imaginary horizontal plane and the 2 nd imaginary horizontal plane).

In the present invention, the widths of the ridges and grooves (i.e., the maximum lengths of the ridges and grooves in the 2 nd direction) of the 1 st nonwoven fabric layer are not particularly limited as long as the effects of the present invention are not impaired, and are, for example, in the range of 0.1mm to 15.0mm, but are preferably in the range of 0.5mm to 10.0mm, and more preferably in the range of 1.0mm to 5.0mm, from the viewpoints of cushioning properties, skin touch, and the like.

In the present invention, the direction in which the projected line portions and the grooved portions of the 1 st nonwoven fabric layer extend, that is, the 1 st direction, is not particularly limited, but is preferably parallel to the width direction of the absorbent article having a vertically long outline shape as in the above-described embodiment. When the 1 st direction in which the raised portions and the recessed portions of the 1 st nonwoven fabric layer extend is parallel to the width direction of the absorbent article having the vertically long outer shape, the 1 st outer peripheral edge portion, at which the end portions of the 1 st nonwoven fabric layer tend to protrude, becomes the outer peripheral edge portion of the end portions in the longitudinal direction of the absorbent article, and therefore, the end portions of the 1 st nonwoven fabric layer do not easily protrude at the outer peripheral edge portion of the end portions in the width direction of the absorbent article, which is likely to come into contact with the thighs and the groin of the wearer, and the foreign body sensation due to the protruding end portions is less likely to occur. This makes it possible to more reliably maintain the above-described excellent wearing feeling for the absorbent article having this structure.

In the above embodiment, the 1 st nonwoven fabric layer 2 is stretched (i.e., in a flat state before the uneven structure is formed) in the 1 st direction D₁Is longer than the 1 st direction D of the 2 nd non-woven fabric layer 3₁The nonwoven fabric having the above length is formed by applying the above-described specific uneven structure 20 to the nonwoven fabric by an arbitrary processing method (for example, shaping under heating or non-heating conditions) to form the 1 st nonwoven fabric layer 2. The specific uneven structure 20 may be provided before joining with the 2 nd nonwoven fabric layer 3, or may be provided before joining with the second nonwoven fabric layer 3Substantially simultaneously with the joining of the 2 nd nonwoven fabric layer 3.

The nonwoven fabric forming the 1 st nonwoven fabric layer is not particularly limited as long as it has a predetermined liquid permeability, and any nonwoven fabric such as a spunlace nonwoven fabric, a through-air nonwoven fabric, a spunbond nonwoven fabric, a point-bond nonwoven fabric, a meltblown nonwoven fabric, or a combination of the above nonwoven fabrics (e.g., SMS nonwoven fabric) can be used. Among them, a spunlace nonwoven fabric can be preferably used in view of excellent flexibility and the like.

The fibers constituting the 1 st nonwoven fabric layer are not particularly limited as long as the 1 st nonwoven fabric layer has a predetermined liquid permeability, and any fibers can be used, but hydrophilic fibers are preferably used in view of liquid absorption properties, liquid retention properties, and the like. Examples of such hydrophilic fibers include cellulose fibers such as cotton and ground pulp; regenerated cellulose fibers such as rayon and fibril rayon; semi-synthetic cellulose fibers such as acetate and triacetate; and hydrophilized thermoplastic resin fibers and composite fibers. Among them, cellulose fibers such as cellulose fibers, regenerated cellulose fibers, and semi-synthetic cellulose fibers are preferably used from the viewpoint of excellent liquid absorption, liquid retention, flexibility, and texture, and particularly, cotton, rayon, or a mixed fiber in which cotton and rayon are combined is preferably used.

In the case where the absorbent article further includes an intermediate sheet or an absorbent body capable of absorbing and retaining excrement such as urine, or in the case where the amount of the excrement to be targeted is assumed to be small, the 1 st nonwoven fabric layer may contain polyolefin-based fibers such as Polyethylene (PE) and polypropylene (PP) in addition to the above-described hydrophilic fibers; polyester fibers such as polyethylene terephthalate (PET); hydrophobic thermoplastic resin fibers such as heat-fusible fibers. When the 1 st nonwoven fabric layer contains such thermoplastic resin fibers, the content thereof is not particularly limited, but from the viewpoint of ensuring a certain level or more of absorption performance, the thermoplastic resin fibers are preferably contained in a mass ratio of less than 50 mass%.

In addition to this, the present invention is,the weight per unit area of the 1 st nonwoven fabric layer is not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area determined in consideration of liquid absorption properties, liquid retention properties, cushioning properties, flexibility, and the like can be used. Such a weight per unit area is, for example, 5g/m²～60g/m²The weight per unit area in the range of (1) is preferably 10g/m²～50g/m²Within the range of (1). The basis weight can be measured in accordance with 5.2 of JIS L1906.

The thickness of the 1 st nonwoven fabric layer is not particularly limited as long as the effects of the present invention are not impaired, and for example, a thickness in the range of 0.001mm to 5.0mm can be used, but is preferably in the range of 0.01mm to 3.0mm, more preferably in the range of 0.05mm to 2.0mm, from the viewpoints of liquid absorbency, liquid retention, cushioning properties, flexibility, skin touch, and the like.

In the present invention, it is preferable that the 1 st nonwoven fabric layer has a thickness larger than that of the 2 nd nonwoven fabric layer. If the 1 st nonwoven fabric layer has a thickness greater than the thickness of the 2 nd nonwoven fabric layer, the 1 st nonwoven fabric layer can ensure a restoring force of the raised strip portion with respect to compression in the thickness direction, and therefore can exhibit a higher cushioning performance. In addition, when a nonwoven fabric having a large restoring force of the raised portions such as the 1 st nonwoven fabric layer is used, the end portions of the 1 st nonwoven fabric layer are generally likely to roll up and protrude toward the skin-facing surface side, or protrude outward in the planar direction, but since the absorbent article of the present invention includes the 2 nd embossed portions, the protruding of the end portions of the 1 st nonwoven fabric layer can be suppressed. Therefore, by using such a nonwoven fabric for the 1 st nonwoven fabric layer, the absorbent article of the present invention can exhibit higher cushioning performance and is less likely to cause a foreign body sensation and poor appearance due to the protrusion of the end portions.

Here, the thickness of the nonwoven fabric used for the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer, and various sheets such as an intermediate sheet and a back sheet described later can be obtained by: a sample piece of a predetermined size (for example, 30 mm. times.30 mm) is cut out from a sheet to be measured, the cut sample piece is set in an automatic compression tester (model: KES FB-3A) manufactured by Gamut, and the thickness (mm) at a pressure of 49Pa applied to the sample piece by a measurement terminal of the tester is measured.

In the above-described embodiment, the 2 nd nonwoven fabric layer 3 constituting the liquid-permeable sheet is adjacent to the non-skin-facing surface of the 1 st nonwoven fabric layer 2, and is joined to the non-skin-facing surface of at least a part of the groove portions 22 of the 1 st nonwoven fabric layer 2 at the joining portions 7. In the present embodiment, the 2 nd nonwoven fabric layer 3 is formed of a nonwoven fabric having a substantially flat structure and a predetermined liquid permeability. Although the case where the 2 nd nonwoven fabric layer has such a substantially flat structure is not an essential constituent condition in the absorbent article of the present invention, if the 2 nd nonwoven fabric layer has such a substantially flat structure, it is easy to form hollow portions having a predetermined volume or more in the interior of the ridge portions of the 1 st nonwoven fabric layer, and it is possible to impart more excellent cushioning properties, flexibility, and the like to the liquid-permeable sheet, and it is possible to obtain more excellent wearing feeling as the absorbent article. On the other hand, if the 2 nd nonwoven fabric layer has a structure in which the second nonwoven fabric layer enters the hollow portions of the raised strips of the 1 st nonwoven fabric layer or a structure in which the hollow portions are filled, it is not easy to form a space between the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer, and the liquid transfer property from the skin-facing surface side to the non-skin-facing surface side of the liquid-permeable sheet is good.

The nonwoven fabric forming the 2 nd nonwoven fabric layer is not particularly limited as long as it has a predetermined liquid permeability, and for example, any nonwoven fabric such as a hydrophobic nonwoven fabric, a water repellent nonwoven fabric, a tissue paper made of hydrophilic fibers, a spunlace nonwoven fabric similar to the 1 st nonwoven fabric layer, a hot air nonwoven fabric, a spunbond nonwoven fabric, a point-bond nonwoven fabric, a meltblown nonwoven fabric, or a combination of the nonwoven fabrics (for example, SMS nonwoven fabric) can be used. Among them, a tissue paper made of hydrophilic fibers is preferably used in view of excellent liquid absorption properties, liquid retention properties, flexibility, and the like.

The fibers constituting the 2 nd nonwoven fabric layer are not particularly limited as long as the 2 nd nonwoven fabric layer has a predetermined liquid permeability, and any fibers can be used, but from the viewpoint of liquid absorption properties, liquid retention properties, and the like, hydrophilic fibers similar to those of the 1 st nonwoven fabric layer are preferably used. Further, the 2 nd nonwoven fabric layer may contain thermoplastic resin fibers in addition to the hydrophilic fibers, as in the 1 st nonwoven fabric layer.

The weight per unit area of the 2 nd nonwoven fabric layer is not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area determined in consideration of liquid absorption properties, liquid retention properties, cushioning properties, flexibility, and the like can be used. Such a weight per unit area is, for example, 1g/m²～50g/m²The weight per unit area in the range of (1) is preferably 3g/m²～40g/m²Within the range of (1).

The thickness of the 2 nd nonwoven fabric layer is not particularly limited as long as the effect of the present invention is not impaired, and for example, a thickness in the range of 0.001mm to 3.0mm can be used, but from the viewpoint of liquid absorption, liquid retention, cushioning properties, flexibility, and the like, a thickness in the range of 0.01mm to 2.0mm is preferable, and a thickness in the range of 0.05mm to 1.0mm is more preferable.

[ Joint part ]

In the above-described embodiment, as shown in fig. 1 and 3, in the sanitary pad 1, the 1 st nonwoven fabric layer 2 (more specifically, the groove portion 22 of the 1 st nonwoven fabric layer 2) and the 2 nd nonwoven fabric layer 3 are joined to each other at the joint portion 7 by an arbitrary adhesive (not shown) such as a hot melt adhesive. When the 1 st nonwoven fabric layer 2 and the 2 nd nonwoven fabric layer 3 are joined at the joint portions 7 in this way, the above-described displacement and deformation between the layers are less likely to occur, and therefore, the absorption performance and the wearing feeling of the absorbent article can be more stably exhibited.

In the sanitary pad 1 of the present embodiment, the 1 st nonwoven fabric layer 2 and the 2 nd nonwoven fabric layer 3 are joined together by the adhesive at the joining portion 7, and an adhesive-free region where no adhesive is present is provided between the outer peripheral edge portion of the sanitary pad 1 and the arc seal portion Rs. If the absorbent article has an adhesive-absent region where the adhesive joining the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer is absent at such a position, that is, between the outer peripheral edge portion of the absorbent article and the circular arc seal portion, the wearer is less likely to feel the hardness of the joined portion due to the adhesive in the vicinity of the outer peripheral edge portion which is likely to come into surface contact with the skin of the wearer, and therefore the wearer can be less likely to feel a foreign body sensation or the like.

In the present invention, the arrangement pattern of the adhesive used for bonding the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer is not particularly limited, and for example, any arrangement pattern such as a plurality of spiral, Ω -like, wavy line-like, saw-like, stripe-like, or belt-like patterns extending in the 1 st direction and/or the 2 nd direction in a plan view can be employed.

The arrangement region (arrangement range) and the arrangement amount (application amount) of the adhesive are not particularly limited as long as the effects of the present invention are not impaired, and any arrangement region and arrangement amount determined in consideration of desired flexibility, liquid permeability, and the like can be employed. The adhesive may be disposed on the non-skin-facing surface of the grooved portion of the 1 st nonwoven fabric layer, or may be disposed on the skin-facing surface of the 2 nd nonwoven fabric layer.

In the present invention, the means for joining the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer is not limited to the above-mentioned adhesive, and any joining means such as a compression means such as embossing processing with or without heating, or a heat welding means such as ultrasonic welding can be used. For example, if the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are joined together by compression means or thermal fusion means, the joined portion (fusion-joined portion) is less likely to be affected by decomposition or the like due to excrement such as urine, and therefore, the joined state of the joined portion can be maintained well even when the absorbent article is wet due to excrement such as urine, and twisting or the like is less likely to occur. As a result, the absorbent article can maintain a good wearing feeling even when wet.

[ intermediate sheet ]

In the sanitary pad 1 of the present embodiment, as shown in fig. 1 and 3, the intermediate sheet 5 is disposed between the front sheet 4 and the back sheet 6 in the thickness direction T of the sanitary pad 1, and functions to impart various characteristics such as cushioning properties, strength, and absorption performance to the sanitary pad 1.

In the present embodiment, the intermediate sheet 5 has the 1 st outer peripheral edge E positioned at both ends of the pad 1 in the longitudinal direction L in plan view₁And extend in the range between and are respectively positioned at the 2 nd outer peripheral edge part E of the two end parts of the sanitary pad 1 in the width direction W₂And has a longitudinal outer shape which is the same as the outer shape of the sanitary pad 1.

In the absorbent article of the present invention, the shape of the intermediate sheet is not limited to that, and any shape and size in plan view can be adopted. Therefore, the intermediate sheet may be provided with an absorbent performance only in a region corresponding to the excretion portion of the absorbent article.

In the present embodiment, the intermediate sheet 5 is joined to the non-skin-facing surface of the front sheet 4 (more specifically, the non-skin-facing surface of the 2 nd nonwoven fabric layer 3) by a hot-melt adhesive (not shown), but the present invention is not limited to such a joining method, and the intermediate sheet and the front sheet may be joined together by any joining means such as hot-melt joining. For example, when the top sheet and the intermediate sheet are joined together by thermal fusion bonding, the joined portion (fused portion) is less likely to be affected by decomposition or the like due to excrement such as urine, and the absorbent article is less likely to be twisted or the like. As a result, the absorbent article can maintain a good wearing feeling even when wet.

The sheet member constituting the intermediate sheet is not particularly limited, and any sheet member can be used depending on the desired characteristics (e.g., cushioning properties, strength, absorbency, etc.). Examples of the sheet-like member that can be used as the intermediate sheet include a hydrophobic nonwoven fabric and an absorbent sheet. When the intermediate sheet is formed of a hydrophobic nonwoven fabric, the absorbent article (specifically, the topsheet, the absorbent sheet, and the like of the absorbent article) is less likely to be twisted and is likely to maintain a good wearing feeling even when the absorbent article absorbs and wets the excreta of a liquid such as urine. On the other hand, if the intermediate sheet is formed of an absorbent sheet, the liquid excrement that has not been completely absorbed by the topsheet but has passed through the topsheet can be absorbed and retained in the intermediate sheet, and therefore leakage, backflow, and the like of the excrement from the absorbent article can be suppressed, and as a result, a good wearing feeling of the absorbent article can be more reliably provided to the wearer.

The intermediate sheet may be formed of a sheet member having a single-layer structure or a multi-layer structure formed using only one of the hydrophobic nonwoven fabric and the absorbent sheet, or may be formed of a sheet member having a laminated structure formed using both the hydrophobic nonwoven fabric and the absorbent sheet. The strength, cushioning properties, absorbency, and the like of the absorbent article when wet can be easily adjusted by appropriately adjusting the number of layers of the sheet-like member constituting the intermediate sheet.

The hydrophobic nonwoven fabric that can be used as the intermediate sheet is not particularly limited as long as it has hydrophobicity, and any nonwoven fabric such as a through-air nonwoven fabric or an air-laid nonwoven fabric can be used. The fibers constituting the hydrophobic nonwoven fabric are not particularly limited as long as they have hydrophobicity, and for example, the following hydrophobic thermoplastic resin fibers can be used: polyolefin fibers such as PE and PP; polyester fibers such as PET; various composite fibers such as sheath-core composite fibers, and the fibers may contain heat-fusible fibers. When the hydrophobic nonwoven fabric contains the heat-fusible fibers, the rigidity of the intermediate sheet is high (that is, the intermediate sheet is not easily twisted) by the fusion bonding of the heat-fusible fibers in the hydrophobic nonwoven fabric, and therefore, the above-described favorable cushioning properties, skin touch, and the like of the surface sheet are easily maintained, and the favorable wearing feeling as an absorbent article is more easily ensured.

Further, as the absorbent sheet that can be used as the intermediate sheet, there is no particular limitation as long as it can absorb and hold liquid excreta, and any absorbent body well known in the art can be used. As such an absorbent body, for example, an absorbent core made of an absorbent material is covered with a core wrap sheet such as a hydrophilic tissue paper. Examples of the absorbent material constituting the absorbent core include hydrophilic fibers, highly absorbent polymers, and the like, more specifically, cellulose fibers such as ground pulp and cotton; regenerated cellulose fibers such as rayon and fibril rayon; semi-synthetic cellulose fibers such as acetate and triacetate; a particulate formed from a highly absorbent polymer such as a sodium acrylate polymer; and materials formed by arbitrarily combining two or more of the above materials.

The weight per unit area of the intermediate sheet is not particularly limited, and any weight per unit area determined in consideration of desired strength, flexibility, cushioning property, and the like can be used. Such a weight per unit area is, for example, 20g/m²～200g/m²The weight per unit area in the range of (1) is preferably 30g/m²～100g/m²Within the range of (1). In the case where the intermediate sheet is formed of a sheet-like member having a multilayer structure, the total weight per unit area of the weights per unit area of the respective layers may be within the above range.

The thickness of the intermediate sheet is not particularly limited, and may be, for example, in the range of 0.01mm to 8.0mm, but is preferably in the range of 0.05mm to 5.0mm, and more preferably in the range of 0.1mm to 3.0mm, from the viewpoint of strength, flexibility, and the like. In the case where the intermediate sheet is formed of the hydrophobic laminated nonwoven fabric, the total thickness of the layers constituting the hydrophobic laminated nonwoven fabric may be within the above range.

In the absorbent article of the present invention, the intermediate sheet is not an essential component, and therefore, in the case where the topsheet is used to secure the liquid-absorbing property, the liquid-retaining property, the strength, and the like of the absorbent article, the intermediate sheet can be omitted from the absorbent article in consideration of the flexibility and the like.

[ Back sheet ]

In the pantiliner 1 of the present embodiment, as shown in fig. 1 and 3, the back sheet 6 is disposed at a position of the non-skin-facing surface Db of the pantiliner 1, and is formed of a liquid-impermeable sheet that is breathable and functions to prevent leakage of excrement such as urine discharged from a wearer to clothes of the wearer by preventing the excrement from passing through the sheet.

In bookIn the embodiment, the back sheet 6 is located at the 1 st outer peripheral edge E of the both ends of the pad 1 in the longitudinal direction L in plan view₁And extend in the range between and are respectively positioned at the 2 nd outer peripheral edge part E of the two end parts of the sanitary pad 1 in the width direction W₂And has a longitudinal outer shape which is the same as the outer shape of the sanitary pad 1. In the absorbent article of the present invention, the back sheet (liquid-impermeable sheet) is not limited to such a shape, and any shape and size in plan view can be adopted.

In the present embodiment, the back sheet 6 is joined to the non-skin-facing surface of the intermediate sheet 5 with a hot-melt adhesive (not shown), but the present invention is not limited to such a joining form, and the back sheet and the intermediate sheet (and the top sheet in the case of an absorbent article without an intermediate sheet) may be joined together with any joining means such as hot-melt joining. For example, when the back sheet is joined to the intermediate sheet or the top sheet by thermal fusion bonding, the joined portion (fused portion) is less likely to be affected by decomposition or the like due to excrement such as urine, and therefore the absorbent article is less likely to be twisted or the like. As a result, the absorbent article can maintain a good wearing feeling even when wet.

The liquid-impermeable sheet used as the back sheet is not particularly limited as long as it has a predetermined liquid-impermeable property, and any liquid-impermeable sheet such as a hydrophobic nonwoven fabric, a resin film of polyethylene or polypropylene having air permeability, a laminate formed by bonding a nonwoven fabric to the resin film, or a laminated nonwoven fabric such as SMS can be used. Among them, a hydrophobic nonwoven fabric is preferably used in view of liquid impermeability, flexibility, air permeability, strength in wet state (difficulty in twisting), and the like. Here, the degree of hydrophobicity of the hydrophobic nonwoven fabric is sufficient if the hydrophobic nonwoven fabric is so hydrophobic that the water dropped when water is dropped on the surface of the hydrophobic nonwoven fabric is not absorbed, but from the viewpoint of difficulty in leakage of excrement such as urine, strength during wetting, and the like, the hydrophobic nonwoven fabric is more preferably so hydrophobic that the water dropped when water is dropped on the surface of the hydrophobic nonwoven fabric is repelled by the surface of the hydrophobic nonwoven fabric to form water droplets (so-called water repellency).

The kind of the hydrophobic nonwoven fabric that can be used as the back sheet (liquid-impermeable sheet) is not particularly limited, and for example, any nonwoven fabric such as a spunbond nonwoven fabric, a point-bond nonwoven fabric, a meltblown nonwoven fabric, and an SMS nonwoven fabric can be used. Among the above nonwoven fabrics, a nonwoven fabric including an ultrafine fiber layer formed of fibers having a fineness of 1dtex or less is preferably used, and an SMS nonwoven fabric is more preferably used.

Since the nonwoven fabric including the ultrafine fiber layer is excellent in air permeability and liquid impermeability and has appropriate flexibility, the wearing feeling of the absorbent article can be further improved when such a nonwoven fabric including the ultrafine fiber layer is used as the back sheet. The lower limit of the fineness of the fibers constituting the ultrafine fiber layer is not particularly limited, but is, for example, about 0.1 dtex.

Further, since the SMS nonwoven fabric is a laminated nonwoven fabric formed of a 3-layer structure of spunbond/meltblown/spunbond, and is a nonwoven fabric which has both air permeability and a certain strength (twisting difficulty) particularly by a spunbond layer and can more effectively suppress the permeation of excrement such as urine (particularly by a meltblown layer which is an ultrafine fiber layer), when it is used as a back sheet, it is possible to more effectively suppress the leakage of excrement such as urine while securing excellent air permeability and twisting difficulty (particularly twisting difficulty when wet).

The constituent fibers of the hydrophobic nonwoven fabric usable as the back sheet are not particularly limited as long as they have hydrophobicity, and for example, hydrophobic thermoplastic resin fibers such as: polyolefin fibers such as PE and PP; polyester fibers such as PET; various composite fibers such as sheath-core composite fibers.

The weight of the back sheet is not particularly limited, and any weight per unit area determined in consideration of flexibility, air permeability, liquid impermeability, strength, and the like can be used. Such a weight per unit area is, for example, 8g/m²～60g/m²The weight per unit area in the range of (1) is preferably 15g/m²～50g/m²Within the range of (1).

The thickness of the back sheet is not particularly limited, and may be, for example, in the range of 0.01mm to 5.0mm, but is preferably in the range of 0.05mm to 3.0mm in view of flexibility, air permeability, liquid impermeability, strength, and the like.

[ 1 st embossed portion ]

As shown in FIGS. 1 to 3, the sanitary pad 1 of the present embodiment includes a circular arc sealing part R formed by a plurality of dot-shaped embossed parts 8 of the 1 st pad_SThe plurality of 1 st embossed portions 8 are formed along the outer peripheral edge (i.e., the 1 st outer peripheral edge E at both ends in the longitudinal direction L) at positions spaced inward in the planar direction from the outer peripheral edge of the sanitary pad 1 in a plan view₁And 2 nd outer peripheral edge portions E located at both ends in the width direction W₂) The front sheet 4 (liquid-permeable sheet), the intermediate sheet 5, and the back sheet 6 (liquid-impermeable sheet) are arranged and integrated in the thickness direction T of the sanitary pad 1. As shown in fig. 1 and 2, at the arc seal portion R_SIn the drawing, a plurality of dot-shaped 1 st embossed portions 8 are arranged in a row so as to draw a predetermined pattern. The plurality of dot-shaped embossed portions 1 are formed by compressing a laminate, which is formed by sequentially overlapping and joining a front sheet 4 (liquid-permeable sheet), an intermediate sheet 5, and a back sheet 6 (liquid-impermeable sheet) as constituent members of the sanitary pad 1, so that both the skin-facing surface of the front sheet 4 and the non-skin-facing surface of the back sheet 6 face each other in the thickness direction T, by a heated or non-heated embossing means (e.g., a pair of pressure rollers or the like). Therefore, the 1 st embossed portion 8 has a relatively high density and thus a relatively hard hardness as compared with other portions. However, in the sanitary pad 1 of the present embodiment, the arc-shaped seal portion R formed by the embossed portion 8 described above is arranged at a position separated inward in the planar direction from the outer peripheral edge portion of the sanitary pad 1_STherefore, the 1 st embossed portion 8 having a relatively high hardness is less likely to come into contact with the skin surface of the wearer such as the thigh and the groin, and the wearer is less likely to be given a feeling of foreign matter due to the 1 st embossed portion 8.

In addition, in the panty liner 1 of the present embodiment, as shown in fig. 1 and 2The arc seal portion R formed by the above-mentioned first embossed portion 8_SIs arranged along the entire outer peripheral edge of the sanitary pad 1 in plan view. The configuration in which the arc seal portion is arranged along the entire region of the outer peripheral edge portion of the absorbent article as described above is not an essential constituent requirement in the absorbent article of the present invention, and the arc seal portion may be arranged at least partially along the outer peripheral edge portion of the absorbent article.

In the present embodiment, the arc seal portion R formed by the above-described first embossed portion 8 is formed in the arc seal portion R_SIn the present invention, although the plurality of dot-shaped 1 st embossed portions 8 are arranged so as to draw a predetermined pattern, the arrangement form of the 1 st embossed portions forming the arc seal portion is not particularly limited as long as the portions are arranged at positions away from the outer peripheral edge portion of the absorbent article inward in the planar direction, and the 1 st embossed portions may be arranged in any form such as a straight line, a curved line, a wavy line, a zigzag shape, and the like.

In the present embodiment, each of the 1 st embossed portions 8 forming the arc-shaped seal portion has a substantially circular plan view shape, but in the present invention, the plan view shape of each of the 1 st embossed portions is not particularly limited, and any shape such as an oval shape, a triangular shape, a quadrangular shape, a star shape, a linear shape, a wavy line shape, a geometric figure, and the like may be adopted in addition to the circular shape as in the above-described embodiment.

The size of each 1 st embossed portion forming the arc-shaped seal portion is not particularly limited as long as the effect of the present invention is not impaired, and any size determined in consideration of the shape retention property of the absorbent article, the leakage prevention property of excrement, the flexibility, and the like can be adopted.

[ 2 nd embossed portion ]

As shown in fig. 1 to 3, the sanitary pad 1 of the present embodiment includes a plurality of dot-shaped embossed portions 2, and the plurality of embossed portions 2 9 are disposed on the sanitary padThe outer peripheral edge of the pad 1 is along the 1 st direction D₁1 st outer peripheral edge part E extending in parallel direction₁And the arc sealing part R_SMore specifically, the 1 st outer peripheral edge E of the self-sanitary pad 1₁A position separated from the arc sealing part R toward the inner side in the plane direction_SA position spaced outward in the planar direction), and has a planar surface area smaller than the planar surface area of the first embossed portion 8 described above. Similarly to the first embossed portion 8, the second embossed portion 9 is formed by compressing the top sheet 4 (liquid-permeable sheet), the intermediate sheet 5, and the back sheet 6 (liquid-impermeable sheet) in the thickness direction T of the sanitary pad 1, and integrates the sheets in the thickness direction T.

The sanitary pad 1 of the present embodiment includes the sanitary pad 1 located at the outer peripheral edge portion of the sanitary pad 1 along the 1 st direction D₁1 st outer peripheral edge part E extending in parallel direction₁And the above-mentioned arc seal part R_SThe 2 nd embossed portion 9 therebetween, so that the 1 st non-woven fabric layer 2 can be restrained from being in the vicinity of the outer peripheral edge portion of the sanitary pad 1 (i.e., the 1 st outer peripheral edge portion E) by the 2 nd embossed portion 9₁Near) end portion 24 is rolled up and protrudes toward the skin-facing surface side Da or the outside in the planar direction, a foreign body sensation and a poor appearance due to the protrusion of the end portion 24 are less likely to occur.

Furthermore, the 2 nd embossing part 9 has a sealing part R with a radius larger than that of the circular arc_SSince the 1 st embossed portion 8 has a small plan view area, even if the 2 nd embossed portion 9 comes into contact with the skin surface of the wearer's thighs, groin area, or the like, the wearer is less likely to feel the stiffness thereof (i.e., the wearer is less likely to be given a foreign body sensation), and the excellent wearing sensation achieved by the top sheet 4 (liquid-permeable sheet) having the specific uneven structure 20 can be maintained satisfactorily.

As described above, in the sanitary pad 1 of the present embodiment, the 1 st outer peripheral edge E₁In a longitudinal direction L (2 nd direction D) in a plan view₂) Upper outer side of the first embossing part, and multiple 2 nd embossing parts in dot shape9 along the 1 st outer peripheral edge portion E₁Is arranged in a curved profile. If the 2 nd embossed portion is arranged along the curved outline shape of the 1 st outer peripheral edge portion of the absorbent article as described above, even in an absorbent article having an outline shape in which the end portion of the 1 st nonwoven fabric layer is easily formed as a free end (that is, an outline shape in which the 1 st outer peripheral edge portion is curved so as to protrude outward in the 2 nd direction in a plan view), it is possible to more reliably suppress the above-described state in which the end portion of the 1 st nonwoven fabric layer is rolled up and protrudes outward in the skin-facing surface or protrudes outward in the planar direction.

In the present embodiment, as shown in fig. 1 and 2, the 2 nd embossed portion 9 is not disposed in the outer peripheral edge portion of the sanitary pad 1 and extends along the longitudinal direction L (the 2 nd direction D)₂) 2 nd outer peripheral edge part E extending in parallel direction₂And the arc sealing part R_SIn the meantime. The arrangement form of the 2 nd embossed portion as described above is not an essential constituent condition in the absorbent article of the present invention, but it is preferable that the 2 nd embossed portion is not arranged between the 2 nd outer peripheral edge portion of the absorbent article and the circular arc seal portion as in the above-described embodiment. If the 2 nd embossed portion is not disposed between the 2 nd outer peripheral edge portion and the circular arc seal portion of the absorbent article, a portion having a high hardness due to the embossed portion is not present in the 2 nd outer peripheral edge portion where the protrusion of the end portion of the 1 st nonwoven fabric layer is unlikely to occur, and therefore, the foreign body sensation is less likely to be imparted to the wearer, and therefore, the excellent wearing sensation of the absorbent article can be maintained more reliably.

In the present invention, the position at which the 2 nd embossed portion is disposed is not particularly limited as long as it is a position between the 1 st outer peripheral edge portion of the absorbent article and the circular arc seal portion, and the 2 nd embossed portion may be disposed at a position separated from the 1 st outer peripheral edge portion of the absorbent article to the inside in the plane direction and at a position separated from the circular arc seal portion to the outside in the plane direction as in the above-described embodiment, or may be disposed at a position overlapping at least the 1 st outer peripheral edge portion of the absorbent article in a plan view.

Here, FIG. 5 shows a main body of a pantiliner according to another embodiment of the present inventionA top view is partially enlarged. In another embodiment of the present invention, as shown in fig. 5, the 2 nd embossed portion 9 is disposed at least as far as the 1 st outer peripheral edge portion E in a plan view₁The position of the coincidence. When the 2 nd embossing part is disposed at such a position (i.e., at least at a position overlapping the 1 st outer peripheral edge part in a plan view), the 2 nd embossing part can reduce the portion of the 1 st nonwoven fabric layer that becomes the free end in the vicinity of the outer peripheral edge part of the absorbent article, and therefore, the state in which the end portion of the 1 st nonwoven fabric layer is curled up to protrude toward the skin-facing surface side or protrude outward in the planar direction can be more reliably suppressed. Therefore, the absorbent article having such a structure is less likely to cause a feeling of foreign matter and a poor appearance due to the protrusion of the end portion.

In the present invention, the arrangement form of the 2 nd embossed portion is not particularly limited as long as the effect of the present invention is not impaired, and the 2 nd embossed portion may be arranged such that a plurality of dot-shaped 2 nd embossed portions are arranged to draw a predetermined pattern similar to the 1 st embossed portion forming the arc seal portion as in the embodiment shown in fig. 1 and 2, or may be arranged in any form such as a straight line, a curved line, a wavy line, or a zigzag.

In the present invention, the shape of each 2 nd embossed portion in a plan view is not particularly limited, and any shape such as an oval, a triangle, a quadrangle, a star, a straight line, a wavy line, and a geometric figure may be adopted in addition to the circle as in the embodiment shown in fig. 1 and 2.

The dimensions of each of the 2 nd embossed portions are not particularly limited as long as they have a smaller plan view area than the plan view area of each of the 1 st embossed portions forming the arc-shaped seal portion, and any dimensions determined in consideration of the shape retention property of the absorbent article, the leakage prevention property of excrement, the flexibility, and the like can be adopted. By providing each of the 2 nd embossed portions with a plan view area smaller than the plan view area of each of the 1 st embossed portions forming the arc-shaped seal portions, even if the 2 nd embossed portion comes into contact with the skin surface of the wearer's thighs, groin, or the like, the wearer is less likely to feel the stiffness thereof (i.e., the wearer is less likely to feel a foreign body sensation), and the excellent wearing sensation achieved by the surface sheet (liquid-permeable sheet) having the above-described specific uneven structure can be favorably maintained.

Next, still another embodiment of the present invention in which the direction in which the ridges and furrows of the top sheet (liquid-permeable sheet) extend is different from the above-described embodiments will be described with reference to the drawings. The configuration other than the configuration different from the above-described embodiments is basically the same as the above-described embodiments, and therefore, the description thereof is omitted.

In the sanitary pad 10 of this embodiment, as shown in fig. 6, the 1 st nonwoven fabric layer 2 of the liquid-permeable sheet constituting the top sheet has projected ridges 21 and recessed grooves 22 along the 2 nd direction D corresponding to the width direction W of the sanitary pad 10₂An uneven structure 20 formed by alternately arranging, wherein the convex strip 21 protrudes toward the skin-facing surface side in the thickness direction T of the sanitary pad 10 and is along the 1 st direction D corresponding to the longitudinal direction L of the sanitary pad 10₁Continuously extending, the groove portion 22 being recessed toward the non-skin-facing surface side in the thickness direction T and extending along the 1 st direction D₁Continuously extending. In the sanitary pad 10, the 1 st nonwoven fabric layer 2 is also stretched in the 2 nd direction D₂(i.e., the direction corresponding to the width direction W of the sanitary pad 10) is longer than the 2 nd direction D of the 2 nd nonwoven fabric layer 3₂Is formed of a length of nonwoven fabric.

Further, as shown in fig. 6, the sanitary pad 10 also includes: arc seal part R_SA plurality of dot-shaped 1 st embossed portions 8, the plurality of 1 st embossed portions 8 being arranged along the outer peripheral edge of the sanitary pad 10 at positions spaced inward in the planar direction from the outer peripheral edge in a plan view; and a 2 nd embossed portion 9 disposed in the outer peripheral portion of the sanitary pad 10 along the 1 st direction D₁1 st outer peripheral edge portion E extending in parallel direction (i.e., respectively located at both ends in the width direction W of the sanitary pad 10 and extending along the substantially longitudinal direction L)₁And the arc sealing part R_SAnd has a plan view area smaller than the plan view area of the 1 st embossed portion 8.

Therefore, in the sanitary pad 10, the 2 nd embossed portion 9 described above can also suppress the 1 st nonwoven fabric layer 2 from being in the vicinity of the outer peripheral edge portion of the sanitary pad 10 (i.e., the 1 st outer peripheral edge portion E)₁Near) end portion 24 is rolled up and protrudes toward the skin-facing surface side Da or the outside in the planar direction, a foreign body sensation and a poor appearance due to the protrusion of the end portion 24 are less likely to occur.

The present invention can be applied to various absorbent articles such as sanitary napkins, (light) incontinence pads, and the like, in addition to the pantiliners of the above embodiments. 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. In the present specification, the numbers "1 st", "2 nd", etc. are used to distinguish items with the numbers, and do not mean the order, priority, importance, etc. of the items.

Description of the reference numerals

1. Pantiliners (an example of an absorbent article); 2. a 1 st nonwoven fabric layer; 20. a concave-convex structure; 21. a raised strip portion; 22. a groove part; 23. a hollow portion; 3. a 2 nd non-woven fabric layer; 4. a surface sheet (an example of a liquid-permeable sheet); 5. an intermediate sheet; 6. a back sheet (an example of a liquid-impermeable sheet); 7. a joint portion; 8. the 1 st embossing part; 9. a 2 nd embossing part; 10. pantiliners (an example of an absorbent article); 11. a release sheet; 12. and an adhesive portion.

Claims

1. An absorbent article, comprising: a liquid-permeable sheet formed by joining a first nonwoven fabric layer 1 forming a skin-facing surface and a second nonwoven fabric layer 2 adjacent to the non-skin-facing surface of the first nonwoven fabric layer at a joint; and a liquid-impermeable sheet positioned closer to the skin-non-facing surface side than the liquid-permeable sheet,

the absorbent article includes:

2. The absorbent article of claim 1,

the raised strip has a hollow interior configuration.

3. The absorbent article according to claim 1 or 2, wherein,

the 2 nd embossed portion is not disposed between the 2 nd outer peripheral edge portion of the outer peripheral edge portion extending in a direction parallel to the 2 nd direction and the circular arc seal portion.

4. The absorbent article according to claim 1 or 2, wherein,

the absorbent article has a longitudinal outer shape having a longitudinal direction and a width direction orthogonal to each other, and the 1 st direction is parallel to the width direction.

5. The absorbent article according to claim 1 or 2, wherein,

the 1 st nonwoven fabric layer and the 2 nd nonwoven fabric layer are joined together at the joining portion with an adhesive, and an adhesive non-existing region where the adhesive is not present is provided between the outer peripheral edge portion and the circular arc seal portion.

6. The absorbent article according to claim 1 or 2, wherein,

the 1 st nonwoven fabric layer has a thickness greater than that of the 2 nd nonwoven fabric layer.

7. The absorbent article according to claim 1 or 2, wherein,

the 2 nd embossed portion is disposed at a position overlapping at least the 1 st outer peripheral edge portion in a plan view.

8. The absorbent article according to claim 1 or 2, wherein,

the 1 st outer peripheral edge portion has an outer shape curved so as to protrude outward in the 2 nd direction in a plan view, and the 2 nd embossed portion is arranged along the outer shape of the 1 st outer peripheral edge portion.