JP2017221617A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article in which a wearer does not have to modify a position of the absorbent article after pulling up shorts in wearing of the absorbent article.SOLUTION: An absorbent article of the invention comprises: a rear surface sheet 23 having a skin facing surface and a non-skin facing surface; and an adhesion part 9 arranged on the non-skin facing surface of the rear surface sheet 23. The absorbent article has an extension area EX which can extend in at least a longitudinal direction L, and the rear surface sheet 23 has an extension structure area B in which plural protrusive parts Bprotruded to the non-skin facing surface side extend in a width direction and arranged in parallel in the longitudinal direction L. The extension area EX is positioned on a position overlapping to the extension structure area B in a thickness direction T. Each of the plural protrusive parts Bis formed of a bottom part Bin which the non-skin facing surface is flat, and wall parts Badjacent to both ends of the bottom part Bin the longitudinal direction L, in the longitudinal direction L. The adhesion part 9 is arranged on the at least two bottom parts Band the wall part Barranged between the bottom parts.SELECTED DRAWING: Figure 4

Description

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

  Absorbent articles such as sanitary napkins, panty liners, and incontinence pads are worn for a long time while in contact with the wearer's crotch. Absorbent articles that are easy to deform following the body shape of a person (that is, excellent in fit) have been studied.

  As such an absorbent article, for example, Patent Document 1 proposes the absorbent article in which a member such as a liquid-impermeable back sheet forming the absorbent article is formed of a stretchable or stretchable material. Yes. According to the absorptive article indicated by this patent documents 1, it is supposed that the physical compatibility (namely, fit nature) to the wearer of an absorptive article can be improved.

JP 2003-38574 A

  The extensible or stretchable absorbent article disclosed in Patent Document 1 has a back sheet shaped like a bellows, and the absorbent article is worn on the non-skin facing side of the back sheet. The adhesive part for fixing to a person's shorts is arrange | positioned. Here, FIG. 5 is a diagram schematically illustrating a state in which the back sheet 23 ′ shaped like a bellows and the shorts U ′ are joined in the sanitary napkin 1 ′ disclosed in Patent Document 1. Specifically, FIG. 5A shows a state in which the protruding portion B1 ′ of the back sheet 23 ′ is in contact with the shorts U ′ via the adhesive portion 9 ′, and FIG. FIG. 5C shows a state where the shorts U ′ is extended and the back sheet 23 ′ is partially peeled from the shorts U ′, and FIG. 5C shows a wearing state where the shorts U ′ is further extended. .

As shown in FIG. 5, the sanitary napkin 1 ′ is disposed on the non-skin facing surface side of the back sheet 23 ′ and a bellows-like region (that is, a region shaped like a bellows) of the back sheet 23 ′. And an adhesive portion 9 ′. Furthermore, the sanitary napkin 1 'in the bellows-like region, protrudes to the non-skin-facing side, extends parallel to the width direction, protruding portions B ₁ a plurality of which are arranged in the longitudinal direction' Each of the plurality of projecting portions B ₁ ′ includes a groove B ₂ ′ having a curved surface shape (that is, a portion having the deepest depth in the thickness direction in the projecting portion B ₁ ′) and a base portion B _4. '(That is, the portion having the shallowest depth in the thickness direction in the protruding portion B ₁ ).

In general, an absorbent article such as a sanitary napkin is placed in shorts by a wearer, and the groove is joined to the shorts via the adhesive part (hereinafter referred to as “the absorbent article is temporarily fixed to the shorts”). After that, the shorts are pulled up to the buttocks and worn by the wearer. However, like the conventional sanitary napkin 1 ′, when the groove B ₂ ′ has a curved shape, the contact area between the shorts U ′ and the groove B ₂ ′ is small, so the shorts U ′ via the adhesive 9 ′. It is difficult to secure the bonding strength between the groove portion B ₂ ′ and temporary fixing (see FIG. 5A). And when it is difficult to fix temporarily, when the wearer pulls up the shorts U ′ to the buttock and the shorts U ′ extends along the buttock of the wearer, the sanitary napkin 1 ′ is joined to the shorts U ′. (See FIG. 5B, particularly the region R surrounded by a solid line), and it is difficult to follow the elongation of the shorts U ′. As a result, the conventional sanitary napkin 1 ′ is once peeled from the shorts U ′ and joined to the shorts U ′ with the base B ₄ ′ raised on the skin facing surface side (see FIG. 5C). The sanitary napkin 1 ′ is likely to be joined to the shorts U ′ with any portion of the back sheet 23 ′ raised, and the wearer may need to correct the position of the absorbent article. is there.

  Then, an object of this invention is to provide an absorbent article with little need for a wearer to correct | amend the position of an absorbent article after pulling up shorts in wearing of an absorbent article.

The absorbent article which concerns on this invention is equipped with the back surface sheet which has a skin opposing surface and a non-skin opposing surface, and the adhesion part arrange | positioned at the said non-skin opposing surface of the said back sheet, A longitudinal direction, the width direction, and thickness An absorbent article having a direction,
The absorbent article has an extension region that can be extended at least in the longitudinal direction in plan view,
The back sheet has an elongated structure region in which a plurality of projecting portions protruding to the non-skin facing surface side extend in the width direction and are juxtaposed in the longitudinal direction,
The extension region exists in a position overlapping with the extension structure region in the thickness direction,
Each of the plurality of projecting portions includes a bottom portion where the non-skin facing surface is flat, and a wall portion that is adjacent to both ends of the bottom portion in the longitudinal direction in the longitudinal direction,
The adhesive portion is disposed on at least two of the bottom portions and the wall portion existing between the at least two bottom portions.

  ADVANTAGE OF THE INVENTION According to this invention, when a wearer wears an absorbent article, after pulling up shorts, an absorbent article with little need to correct the position of an absorbent article can be provided.

FIG. 1 is a plan view of a sanitary napkin 1 according to an embodiment of the present invention as viewed in the thickness direction from the top sheet side. FIG. 2 is a plan view of the sanitary napkin 1 according to an embodiment of the present invention as viewed in the thickness direction from the back sheet side. Figure 3 is an end view of the longitudinal section of the sanitary napkin 1 according to one embodiment, along the widthwise central axis C _L extending in the longitudinal direction of the present invention. FIG. 4 is a view for explaining a sanitary napkin 1 according to an embodiment of the present invention. FIG. 5 is a view for explaining a conventional sanitary napkin 1 ′. FIG. 6 is a plan view of the absorbent body 22 used in the sanitary napkin 1 according to one embodiment of the present invention in an unstretched state (natural state). FIG. 7 is a plan view schematically showing an extended state of the absorbent body 22 used in the sanitary napkin 1 according to the embodiment of the present invention. FIG. 8 is a schematic diagram for explaining a method of measuring the adhesive strength of the adhesive portion arrangement region arranged on the non-skin facing surface of the back sheet. FIG. 9 is an overall schematic diagram of a device for manufacturing a sanitary napkin 1 according to an embodiment of the present invention. FIG. 10 is a schematic diagram of an apparatus for manufacturing the back sheet 23 of the sanitary napkin 1 according to an embodiment of the present invention.

[Aspect 1]
An absorbent article comprising a back sheet having a skin facing surface and a non-skin facing surface, and an adhesive portion disposed on the non-skin facing surface of the back sheet, and having a longitudinal direction, a width direction, and a thickness direction. ,
The absorbent article has an extension region that can be extended at least in the longitudinal direction in plan view,
In the back sheet, a plurality of protruding portions protruding toward the non-skin facing surface side extend in the width direction at positions overlapping with the extension region in the thickness direction, and are arranged in parallel in the longitudinal direction. Has an elongated structure region that is
Each of the plurality of projecting portions includes a bottom portion where the non-skin facing surface is flat, and a wall portion that is adjacent to both ends of the bottom portion in the longitudinal direction in the longitudinal direction,
The absorbent article, wherein the adhesive portion is disposed on at least two bottom portions and the wall portion existing between the at least two bottom portions.

In the absorbent article according to the present aspect, the elongated structure region of the back sheet has a plurality of protrusions each having a predetermined bottom and a predetermined wall, and the adhesive portion has at least two protrusions. Are arranged at the bottom of the wall and the wall between them. Therefore, when the wearer wears the absorbent article, when the absorbent article is placed on the shorts held by the thighs of both legs, the absorbent article is sufficiently attached to the shorts by the adhesive portion disposed on the flat bottom. The absorbent article has excellent temporary fixability to shorts. Next, when the wearer pulls up the shorts on the buttocks of the wearer, the shorts generally extend at least in the front-rear direction. However, the absorbent article has excellent temporary fixability, so It can stretch to follow.
When the absorbent article stretches following the growth of the shorts, the distance between the wall part and the shorts approaches, and finally the absorbent article is sufficiently fixed to the shorts by the adhesive part arranged on the wall part. The absorbent article has excellent book-fixing properties to shorts. In addition, since the absorbent article is excellent in temporary fixability and can extend following the growth of shorts, any part of the back sheet remains raised regardless of the arrangement form of the adhesive portion. There is little risk of joining to shorts.
As mentioned above, the said absorbent article is excellent in temporary fixability and this fixability, and there is little necessity for a wearer to correct the position of an absorbent article after pulling up shorts in wearing of an absorbent article.

[Aspect 2]
The total area ratio of the bottom with respect to the surface area on the non-skin-facing surface side of the elongated structure region is 20 to 40%, and the pitch of the plurality of protrusions in the longitudinal direction is that of the plurality of protrusions. The absorbent article according to aspect 1, which is 2.0 times to 5.0 times the depth.

  In the absorbent article according to this aspect, the elongated structure region has a predetermined bottom total area ratio and a predetermined protrusion pitch. Therefore, the absorbent article is excellent in extensibility of the extension region, temporary fixability, and main fixability.

[Aspect 3]
The aspect 1 or the adhesive surface of the said adhesion part arrange | positioned at the said bottom part, and the adhesion surface of the said adhesion part arrange | positioned at the said wall part have an area ratio of 5-30% and 70-95%. 2. The absorbent article according to 2.

  In the absorbent article according to the present aspect, since the adhesive part is present at the bottom part and the wall part at a predetermined area ratio, the absorbent article is excellent in temporary fixability and permanent fixability, and wearer However, when the absorbent article is worn, there is little need to correct the position of the absorbent article after raising the shorts.

[Aspect 4]
In the thickness direction, the absorbent article further includes an adhesive portion arrangement region composed of a non-adhesive portion where the adhesive portion and the adhesive portion are not arranged at a position overlapping the elongated structure region,
The absorptive article according to any one of aspects 1 to 3, wherein the adhesive strength in the adhesive portion arrangement region is larger than a force necessary to extend the extension region by 20% in the longitudinal direction.

  In the absorbent article according to the present aspect, the adhesive strength in the adhesive portion arrangement region is larger than the force necessary to extend the extension region by 20%, so that the shorts are constant according to the shape of the wearer's buttocks Even if stretched to a certain extent (that is, stretched within a range of 20% or less), the stretched region of the absorbent article easily follows the stretch of the shorts without peeling off the shorts, so that the wearer can wear the shorts. There is little need to correct the position of the absorbent article after being pulled up to the buttocks.

[Aspect 5]
The said absorbent article is the skin opposing surface side of the said back surface sheet | seat, Comprising: In the said thickness direction, it has any one or more elastic sheets in the position which overlaps with the said expansion | extension structure area | region. Absorbent article as described in 1.

  The absorbent article according to this aspect further includes a stretchable sheet at a position overlapping with the elongated structure region in the thickness direction, so that the wearer takes out the absorbent article from the individual packaging and expands the absorbent article. Even if the absorbent article is stretched in the longitudinal direction in order to stretch the fold line of the individual package of the absorbent article before being placed in shorts, the shape of the absorbent article is due to the stretchability of the stretchable sheet. Since it is easy to return to the state before extending | stretching, when a wearer attaches the said absorbent article to shorts and temporarily fixes, it is easy to position accurately.

[Aspect 6]
The absorbent article has, in plan view, an excretion opening corresponding area, and a rear area located on the rear side of the excretion opening corresponding area,
The said elongate structure area | region is an absorbent article as described in any one of aspects 1-5 which exists in the said back area | region at least.

  The absorbent article which concerns on this aspect WHEREIN: When the wearer pulls up shorts to a buttocks when the said elongate structure area exists in the said back area | region at least, the wearer's buttocks where the extensibility of an absorbent article is most required Since the portion corresponding to the vicinity is easy to follow the extension of the shorts without peeling off the shorts, the absorbent article easily follows the extension of the shorts without peeling off the shorts. There is less need to correct the position of the absorbent article after it is pulled up.

[Aspect 7]
The absorbent article further has a low stretch region that has a lower elongation rate than the stretch region or is non-stretched in plan view,
The absorbent article according to any one of aspects 1 to 6, wherein the low-elongation region is present at least in a region including a front edge in the longitudinal direction and a region including a rear edge.

  In the absorbent article according to this aspect, the low elongation region is present in at least a region including the front edge in the longitudinal direction of the absorbent article and a region including the rear edge, so that the wearer can In the vicinity of both ends in the longitudinal direction that are easily grasped by hand, the absorbent article is difficult to extend, and when the wearer attaches the absorbent article to the shorts and temporarily fixes it, it is easy to position with high accuracy.

  Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In this specification, unless otherwise specified, “an object placed on a horizontal surface in an unfolded state (for example, an absorbent article, an absorbent main body, an absorber, etc.) “Viewing an object from the lower side” is called “plan view”. In particular, when the object is an absorbent article, viewing the absorbent article in the thickness direction from the top sheet side may be simply referred to as “plan view”, and the object is a back sheet. In some cases, viewing in the thickness direction from the non-skin facing surface side of the back sheet while the absorbent article is unfolded may be simply referred to as “plan view”.

Various directions and the like used in this specification are as follows unless otherwise specified.
In this specification, “longitudinal direction” refers to “a direction in which the length of a vertically long object in plan view is long”, and “width direction” refers to “a direction in which the length of a vertically long object in plan view is short (short side). Direction) ”and“ thickness direction ”means“ perpendicular direction with respect to the object placed on the horizontal plane in the unfolded state ”. The longitudinal direction, the width direction, and the thickness direction are orthogonal to each other.

  Further, in the present specification, "the one side that is relatively proximal to the abdomen of the wearer when the wearer wears the absorbent article in the longitudinal direction of the absorbent article" The front side of the absorbent article, in the longitudinal direction of the absorbent article, when the wearer wears the absorbent article, the distal side relative to the wearer's abdomen (that is, relative to the wearer's back) The “other side that is relatively proximal” is referred to as “the rear side of the absorbent article”. In addition, in this specification, the front area | region and back area | region of an absorbent article point out the area | region of the front side and back area | region of an absorbent article, respectively.

Further, in this specification, "vertically elongated object (e.g., an absorbent article, the absorbent main body, the absorbent body, etc.) in the width direction of the relatively proximal with respect to the width direction central axis C _L extending in the longitudinal direction side "referred to as" inner side in the width direction ", in" a width direction of the vertically elongated object, the outer side of the "width direction relatively distal" with respect to the widthwise central axis C _L "

  Further, in the present specification, unless otherwise specified, in the thickness direction of the absorbent article, “relatively proximal to the skin facing surface of the wearer when the absorbent article is worn” "Surface side" is referred to as "relatively distal to the wearer's skin facing surface when the absorbent article is worn" and is referred to as "non-skin facing surface side". In addition, in this specification, "surface on the skin facing surface side" and "non-skin facing surface side" of various members constituting the absorbent article (for example, a surface sheet, an absorbent body, a back sheet, an elastic sheet, etc.) The “surface” is simply referred to as “skin facing surface” and “non-skin facing surface”, respectively.

  Further, in the present specification, when the wearer wears the absorbent article, the degree to which the absorbent article is fixed to the shorts when the absorbent article is placed on the shorts held by the thighs of both legs is indicated by “ It is referred to as “temporary fixability”, and the degree to which the absorbent article is fixed to the shorts when the wearer pulls the shorts to the buttocks of the wearer is referred to as “main fixability”.

[Basic structure of absorbent article]
FIG. 1 is a plan view of a sanitary napkin 1 (absorbent article) according to an embodiment of the present invention as viewed in the thickness direction from the surface sheet side, and FIG. It is the top view seen in the thickness direction from the back sheet side in the state where it developed. Further, FIG. 3, the sanitary napkin 1 is an end view of a longitudinal section along the widthwise center axis C _L extending in the longitudinal direction. 1 to 3, the upper side of the drawing corresponds to the front side of the absorbent article, and the lower side of the drawing corresponds to the rear side of the absorbent article.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 according to this embodiment has a vertically long outer shape having a longitudinal direction L and a width direction W in plan view. A vertically long absorbent main body 2 having a longitudinal direction and a width direction, and a pair of substantially trapezoidal flaps extending outward in the width direction at a position closer to the front side of the central portion in the longitudinal direction of the absorbent main body 2 It is comprised by the part 3, 3 '.

As shown in FIGS. 1 to 3, the absorbent main body 2 has a liquid-permeable surface sheet 21 located on the skin facing surface side and a liquid impermeable surface located on the non-skin facing surface side in the thickness direction T. The back sheet 23, the absorbent body 22 having a plurality of slits S positioned between the sheets and extending in the width direction W, and the absorbent body 22 and the back sheet 23 in the rear region A ₃ of the sanitary napkin 1. A plurality of adhesive portions that are disposed between and extend at least in the longitudinal direction L, and are disposed on the non-skin facing surface of the back sheet 23 and extend continuously or intermittently in the width direction W. 9 and is configured so that liquid excretion such as menstrual blood and urine discharged from the wearer can be absorbed and held by the absorbent body 22 while penetrating in the thickness direction T. Yes.
On the other hand, as shown in FIGS. 1 and 2, the pair of flap portions 3, 3 ′ has a topsheet 21 that extends outward in the width direction W from the absorbent main body portion 2 in the thickness direction T, and A back sheet 23 extended outward from the absorbent body 2 in the width direction W, and an adhesive part 4 for fixing clothes (underwear) extending in the longitudinal direction L disposed on the non-skin facing surface of the back sheet 23; 4 '.

In addition, when the sanitary napkin 1 is worn, the non-skin facing surface of the absorbent main body 2 is attached to the skin facing surface of the wearer's underwear via the adhesive portion 9, and then the pair of flap portions 3, 3 'is fixed to the underwear by being attached to the non-skin facing surface of the underwear via the adhesive portions 4 and 4' while being folded back to the non-skin facing surface side of the underwear. Therefore, when the sanitary napkin 1 is worn, the non-skin facing surfaces of the pair of flap portions 3 and 3 ′ are surfaces facing the wearer's skin facing surfaces.
Here, the adhesive used for the adhesive part 9 in the absorbent main body 2 and the adhesive parts 4 and 4 'in the flap parts 3 and 3' for fixing the sanitary napkin 1 to the wearer's underwear is respectively physiological. If it can fix the napkin 1 for a wearer's underwear, it will not restrict | limit, For example, arbitrary adhesives, such as a styrene-type polymer, can be used. In addition, since a pair of above-mentioned flap part is not an essential component in this invention, the absorbent article of this invention does not need to have the said pair of flap part.

In the sanitary napkin 1 according to the present embodiment, as shown in FIG. 1, the absorption main body 2 has a front end edge 5 in the longitudinal direction L located on the front side of the sanitary napkin 1 in plan view, A rear end edge 6 in the longitudinal direction L located on the rear side of the sanitary napkin 1, and between the end edges 5 and 6, the sanitary napkin 1 along the longitudinal direction L. the front region a ₁ located on the front side, a back region a ₃ located on the rear side of the sanitary napkin 1, and corresponding to the excretion area a ₂ located between these regions a _1, a _3, and Have.
Each area A ₁ to A ₃ described above in FIG. 1, two imaginary straight line extending in the width direction W, i.e., in the longitudinal direction L 'of the adhesive portions 4, 4' of the pair of flap portions 3,3 both end portions 7,8,7 ', 8' and the first virtual straight line L ₁ extending in the width direction W so as to include a pair of first end portions 7 of the 'located on the front side in the longitudinal direction L of each adhesive Extending in the width direction W so as to include a pair of second end portions 8 and 8 ′ located on the rear side in the longitudinal direction L of both end portions 7, 8, 7 ′ and 8 ′ in the longitudinal direction L of the portions 4 and 4 ′. a second virtual straight line L _2, are respectively divided by.

  Here, in the present specification, the “excretion opening-corresponding area” refers to an area facing or abutting the wearer's excretion opening when the absorbent article is worn, and the type and use of the absorbent article (specifically, Is an area that is appropriately set for each type of absorbent article according to the type of liquid excreta such as urine, feces, menstrual blood, the age and sex of the intended wearer. It should be noted that the excretory opening corresponding region is usually absorbed in a plan view when the absorbent article has a substantially central part in the longitudinal direction or a position closer to the front side (for example, if the absorbent article has an absorbent main body part and a flap part). In the main body, when the absorbent article is a position closer to the front side overlapping in the longitudinal direction with the flap part, the absorbent article has a constricted part constricted inward in the width direction at a substantially central part in the longitudinal direction. Is a position corresponding to the constricted portion in the absorbent main body portion in plan view, and when the absorbent article is composed of an oblong absorbent main body portion, the longitudinal direction extending in the width direction of the absorbent main body portion The longitudinal length of the absorbent article is about 1/3 or more of the longitudinal length of the absorbent article, and the width of the absorbent article is about 1/3 or more of the overall length of the absorbent article. Set to have a direction length , For example, when the absorbent article is of the napkin such as for night, the longitudinal length of the corresponding to the excretion area, also be set to be less than 1/3 of the entire longitudinal length of the absorbent article.

The sanitary napkin 1 according to this embodiment, as shown in FIGS. 1 and 3, located between the topsheet 21 and the backsheet 23 in the back region A ₃ described above, stretch in at least the longitudinal direction L comprises a stretchable sheet 24 having the sex, the absorber 22, in corresponding to the excretion area a ₂ of the above, the non-stretchable region NEL ₂ extending across the widthwise central axis C _L extending in the longitudinal direction L In addition, in the rear region A ₃ , the stretch region EL _A that extends in the longitudinal direction L and the width direction W and overlaps the stretch sheet 24 and the thickness direction T, is adjacent to and absorbs the back of the stretch region EL _A And a rear non-stretchable region NEL ₃ extending in the entire width direction of the body 22.

  Hereinafter, various members constituting the absorbent article of the present invention will be described in more detail using the sanitary napkin 1 according to the above-described embodiment.

[Surface sheet]
In the sanitary napkin 1 according to the present embodiment, as shown in FIGS. 1 and 3, the topsheet 21 is a region extending from the front region A ₁ to the rear region A ₃ of the sanitary napkin 1 (specifically, the longitudinal direction). (Region extending from the front end edge 5 to the rear end edge 6) of the L) and disposed on the skin facing surface side in the thickness direction T, and is configured by a liquid permeable sheet member that can directly contact the wearer's skin facing surface. Has been. Such a liquid-permeable sheet member is not particularly limited as long as it has various properties (for example, liquid permeability, flexibility, touch, etc.) that can be used as a surface sheet of an absorbent article. Nonwoven fabrics such as spunlace nonwoven fabrics and air-through nonwoven fabrics formed using hydrophilic fibers such as thermoplastic resin fibers that have been subjected to a chemical treatment can be used. Especially, it is preferable that the surface sheet used for the absorbent article of the present invention uses a liquid-permeable sheet member having stretchability or extensibility in at least one direction (direction corresponding to the longitudinal direction L of the absorbent article). When such a liquid-permeable sheet member is used as the top sheet, the absorbent article is more easily deformed in accordance with the wearer's movement (that is, has excellent dynamic fit). The feeling of wearing can be further improved.

  Here, in this specification, “elongation” means 5.0 N in two predetermined directions opposite to each other according to the method described in “6.3 Tensile strength and elongation” of JIS L 1913: 2010. When pulled by force, it stretches 3% or more with respect to the length (100%) of the natural state (that is, the state before stretching) without breaking, ie, the length after stretching is 103% or more. The term “stretching” means that the object is stretched by a predetermined force in a predetermined two directions opposite to each other and stretched by 10% or more (that is, the length after stretching becomes 110% or more). And then contracting 7% or more when the force is released (ie, the length after contraction is the length of the object in the natural state (the state before extension) (100%). 100% or more and 103% or less) means.

  The liquid-permeable sheet member having the above-described stretchability is not particularly limited as long as it has stretchability in at least one direction, for example, stretchability of a urethane resin spunbond nonwoven fabric subjected to a hydrophilic treatment. Nonwoven fabric: Laminated nonwoven fabric having a concavo-convex structure in which a urethane resin spunbond nonwoven fabric and air-through nonwoven fabric stretched in at least one direction are integrated by embossing or the like; Urethane resin or ethylene-vinyl acetate copolymer resin (EVA) A perforated film made of an elastic resin and the like and subjected to a hydrophilic treatment can be suitably used. The liquid permeable sheet member having extensibility described above is not particularly limited as long as it has extensibility in at least one direction. For example, a nonwoven fabric having a concavo-convex structure that can be extended in one direction is preferably used. Can be used.

  In addition, the liquid permeable sheet member having stretchability or extensibility that can be used as the surface sheet may have the above-described stretchability or extensibility in the entire region (the entire surface in a plan view). The region including at least the region overlapping the stretchable region of the absorber in the rear region in the thickness direction preferably has the above-described stretchability or extensibility, and further, the stretch of the absorber in the rear region. More preferably, only the region overlapping with the region in the thickness direction has the above-described stretchability or extensibility. When the topsheet has stretchability or extensibility only in such a specific region, the absorbent article is in such a specific region (particularly in a region overlapping with the stretchable region of the absorber in the thickness direction). In addition, since the region can be more easily deformed in accordance with the movement of the wearer, the state where the region is in close contact with the skin facing surface of the wearer can be more reliably realized, while in the excretion port corresponding region of the absorbent article Since the force in the twisting direction applied to the rear region of the absorbent article is not easily propagated and the shape of the absorbent main body in the region corresponding to the excretion port is more easily maintained, the liquid excrement discharged from the wearer is removed. It can be absorbed more stably.

The dimensional shape of the topsheet is not particularly limited as long as it can cover the skin-facing surface of the absorbent body, and has an arbitrary dimensional shape according to the size, sex, use, etc. of the person wearing the absorbent article. Can be adopted. The basis weight of the topsheet is not particularly limited as long as it does not inhibit the effects of the present invention, for example, it can be adopted a basis weight in the range of ^{5g / m 2 ~100g / m 2} , a liquid-permeable basis weight or within the range in view of the 20g / m ² ~50g / m ² flexibility is preferred. The basis weight can be measured according to JIS L 1906 5.2.

  Further, the thickness of the surface sheet is not particularly limited as long as the effect of the present invention is not impaired, and for example, a thickness within the range of 0.001 mm to 5.0 mm can be adopted. From the point of these, the thickness within the range of 0.01 mm-3.0 mm is preferable, and also the thickness within the range of 0.1 mm-1.0 mm is more preferable.

In addition, the thickness of sheet members, such as a surface sheet, can be obtained with the following measuring methods.
<Method for measuring thickness of sheet member>
(1) A sample sheet having a predetermined size (for example, 30 mm × 30 mm) is cut out from the sheet member to be measured.
(2) The cut sample sheet is set in an automated compression tester “KES FB-3A” manufactured by Kato Tech Co., Ltd., and the thickness (mm) when the pressure on the sample sheet by the measurement terminal of the tester is 49 Pa. ) And the thickness (mm) is taken as the thickness of the sample sheet.

[Back sheet]
In the sanitary napkin 1 according to the present embodiment, as shown in FIGS. 1 to 3, the back sheet 23 is a region extending from the front region A ₁ to the rear region A ₃ of the sanitary napkin 1 (specifically, the longitudinal direction). Leakage of liquid excretion such as menstrual blood and urine that is disposed on the non-skin facing surface side in the thickness direction T in a region extending from the front edge portion 5 to the rear edge portion 6 of L) It is comprised by the liquid-impermeable sheet member to prevent. Such a liquid-impermeable sheet member has various properties (liquid-impermeable, breathable, flexible, etc.) that can be used as a back sheet of an absorbent article, and is subjected to specific shaping as described later. For example, a known liquid-impermeable sheet member such as a resin film made of polyethylene or polypropylene having air permeability, a sheet made of thermoplastic resin, or the like can be used. Among such liquid-impermeable sheet members, the back sheet used for the absorbent article of the present invention is a liquid-impermeable sheet having extensibility in at least one direction (direction corresponding to the longitudinal direction L of the absorbent article). It is preferable to use a member. When a liquid-impermeable sheet member having such extensibility is used as the back sheet, when the wearer places the absorbent article on the shorts and pulls the shorts up to the buttocks, the absorbent follows the shorts elongation. The article is also easily stretched, and the wearing feeling of the absorbent article can be improved.

In the present embodiment, the back sheet 23 is constituted by a liquid-impermeable sheet member, and as shown in FIGS. 2 and 3, an elongated structure region that can be elongated in the longitudinal direction L in the rear region A ₃ described above. while having a B, and the front region a ₁ and corresponding to the excretion area a ₂ of the above, no said extension structure region B. In the elongated structure region B, the back surface sheet 23 has a plurality of projecting portions B ₁ that protrude to the non-skin facing surface side, extend in parallel with the width direction W, and are arranged in parallel in the longitudinal direction L. Also, each of the plurality of projecting portions B _1, the non-skin facing surface flat bottom B _2, in the longitudinal direction L, the wall B ₃ which lies adjacent to the longitudinal direction L across the bottom B ₂ It is comprised by. In the present embodiment, a portion extending in the width direction W and having the shallowest depth in the thickness direction in the protruding portion B ₁ may be referred to as a base portion B ₄ .

In the present specification, the bottom portion refers to two folding lines extending in the width direction at a predetermined interval in the longitudinal direction and a width extending in the longitudinal direction in the protruding portion of the elongated structure region of the back sheet. An area surrounded by both ends in the direction. Here, the folding line is formed by a physical process such as a gear stretching process.
Further, as shown in FIG. 3, each wall portion B ₃ is connected to an end portion in the longitudinal direction L of the bottom portion B ₂ is inclined from the base B ₄ in a convex shape. That is, it is preferable that the bottom portion has a deeper depth in the thickness direction than any portion of the base portion in the protruding portion. When the projecting portion has such a shape, when the wearer places the absorbent article on the shorts, the non-skin facing surface of the bottom portion can easily secure a contact area with the shorts.

More specifically, the bottom B ₂ is a long side in the width direction W of the sanitary napkin 1 in plan view, has a substantially rectangular shape having其s a short side in the longitudinal direction L.
In the present specification, the “flat” related to the bottom includes not only a complete flat but also a substantial flat. Substantially flat means that in the longitudinal cross section of the absorbent article in the stretched structure region of the back sheet, the bottom of each of the plurality of protrusions has the following requirements: the hypothesis connecting both ends of the bottom in the longitudinal direction The ratio of the maximum distance of the bottom constituent line from the imaginary line to the length of the line is preferably greater than 0 and less than 0.05, more preferably greater than 0 and less than 0.03, and even more preferably Means satisfying that it is greater than 0 and less than 0.01. In addition, in the cross section in the longitudinal direction of the absorbent article, each bottom portion of the plurality of protruding portions satisfies the above requirement. In each of the five different cross sections in the longitudinal direction of the absorbent article, the above requirement Satisfying.

  Moreover, the length connecting both ends in the longitudinal direction of the bottom of each of the plurality of protrusions is preferably 0.3 mm or more and 10 mm or less, more preferably 0.5 mm or more and 8 mm or less. When the bottom portion has such a shape, when the wearer places the absorbent article on the shorts, the non-skin facing surface of the bottom portion easily secures a contact area with the shorts. In addition, when the wearer places the absorbent article on the shorts, the bottom in the present invention is not limited to a substantially rectangular shape as long as the non-skin facing surface of the bottom easily secures the contact area with the shorts, In addition to a trapezoidal shape in a plan view, an arbitrary shape such as an arbitrary curve extending in the width direction W or a shape defined by a wavy line can be adopted.

  Moreover, it is preferable that a flat bottom part is substantially parallel to the plane direction (direction parallel to a longitudinal direction and the width direction) of an absorbent article. More specifically, the angle formed by the surface including any flat bottom and the surface extending in the planar direction of the absorbent article is preferably 0 to 15 degrees, more preferably 0 to 10 degrees, Preferably it exists in the range of 0-5 degree | times. By having such a configuration of the flat bottom, when the wearer places the absorbent article on the shorts, the non-skin facing surface of the bottom can easily secure a contact area with the shorts.

On the other hand, the wall portion B ₃ extends from both ends of the bottom portion B _{2 in} the longitudinal direction L while reducing the depth in the thickness direction T in a cross-sectional view along the longitudinal direction L, and the protruding portion B _1. Forming the wall part. Further, in the present invention, the shape of the wall portion is not limited, and is formed by a shape that is inclined concavely from the base portion and connected to the end portion in the longitudinal direction of the bottom portion, or one or more curved surfaces and a flat plane. It may be.

In the present embodiment, as shown in FIG. 3, the protrusion B ₁ described above has a structure protruding to the skin facing surface side in the thickness direction of the back sheet 23, and the base B ₄ described above is the back sheet. 23 has a structure recessed in the non-skin facing surface side in the thickness direction.

In the present embodiment, the elongated structure region B exists in the above-described rear region A _3. However, in the absorbent article according to the present invention, the arrangement mode of the elongated structure region is not limited to this, and the elongated structure region May exist in the above-mentioned front area, the excretion opening corresponding area, or both of these areas. However, it is preferred that the elongated structure region is present at least in the rear region. With this configuration, when the wearer pulls the shorts up to the buttock and wears the shorts, the portion corresponding to the vicinity of the buttock of the wearer who is most required to be stretchable of the absorbent article easily follows the shorts. The feeling of wearing can be further improved. Furthermore, when the stretch structure region is present at least in the rear region, the portion corresponding to the vicinity of the wearer's buttocks where the stretchability of the absorbent article is most required is combined with the presence of the adhesive portion described later. Therefore, the necessity of correcting the position of the absorbent article is reduced.
Further, if the back sheet has such an elongated structure region, it is possible to impart flexibility, cushioning properties, etc. in the thickness direction of the absorbent article, further improving the wearing feeling of the absorbent article. Can be made. In addition, when the back sheet that is easily visible to the wearer has such an elongated structure region, the absorbent article of the present invention is a product that is particularly excellent in extensibility, fit, flexibility, etc. There is also an advantage that it is easy for a person to recognize.

  In the above-described elongated structure region, the depth of the projecting portion (that is, the distance between the horizontal surface including the non-skin facing surface at the bottom of the projecting portion and the horizontal surface including the skin facing surface of the base) is the present invention. The depth is not particularly limited as long as the effect is not inhibited, and for example, a depth in the range of 0.1 mm to 1.2 mm can be employed. From the viewpoints of extensibility, cushioning properties, liquid diffusibility, and the like, the depth of the protruding portion is preferably in the range of 0.2 mm to 1.0 mm, and more preferably in the range of 0.4 mm to 0.8 mm.

  Further, the pitch of the plurality of protrusions described above (that is, the interval (mm) between longitudinal centerlines extending in the width direction at the bottom of two adjacent protrusions) is not particularly limited. , A pitch in the range of 0.5 mm to 5.0 mm can be adopted, but a pitch in the range of 1.0 mm to 4.0 mm is preferable from the viewpoint of extensibility, cushioning properties, liquid diffusibility, etc. A pitch in the range of 2.0 to 3.0 mm is more preferable. Note that the pitch of the plurality of protrusions is based on a plane photograph of the back sheet in a non-pressurized state (that is, a state in which the elongated structure region is not extended) at the bottom of two adjacent protrusions. It can be measured as the distance (mm) between the longitudinal center lines extending in the width direction.

The total area ratio of the bottom non-skin facing surface to the surface area of the non-skin facing surface of the back sheet in the stretched structure region is preferably 20 to 40%, more preferably 25 to 35%. Note that the surface area of the non-skin facing surface of the back sheet and the total area of the non-skin facing surface of the bottom part in this stretched structure region are based on the cross-sectional photograph of the back sheet in the non-pressurized state. Obtain the length of the contour line of the elongated structure region and the total length of each bottom, and multiply these by the length of the width of the elongated structure region in plan view, respectively. It can be obtained as the total area A _{B of the} surface area A _E and the non-skin facing surface of the bottom. Further, with respect to the surface area of the non-skin facing surface of the backsheet in the extended configuration area, the total area ratio of the non-skin-facing surface of the bottom portion is capable of calculating the A _B as a percentage obtained by dividing the A _E.
The pitch of the protrusions in the longitudinal direction is preferably 2.0 to 5.0 times, more preferably 3.0 to 4.5 times, and still more preferably 3 times the depth of each protrusion. .8 to 4.2 times. The stretched structure region has a predetermined total area ratio of the bottom portion and a pitch of the predetermined projecting portion, so that it is easy to ensure the stretchability of the absorbent article by the stretched structure region, and the wearer is able to secure the absorbent article. Is placed on the shorts, the distance between the wall and the shorts in the elongated structure region becomes shorter, and when the wearer pulls the shorts up to the buttocks, it is easier to secure a contact area with the shorts. Combined with the presence of the adhesive section described later, when the wearer pulls the shorts up to the buttocks and wears the shorts, the absorbent article is easy to follow the stretch of the shorts without further peeling from the shorts. However, when the absorbent article is worn, there is less need to correct the position of the absorbent article after pulling up the shorts.

  In the present invention, the size and shape of the back sheet is not particularly limited as long as it can prevent leakage of liquid excreta discharged from the wearer, and is suitable for the size, sex, usage, etc. of the wear target of the absorbent article. Any size and shape can be adopted. Further, the thickness of the back sheet is not particularly limited as long as the effect of the present invention is not impaired. For example, a thickness in the range of 0.001 mm to 5.0 mm can be adopted, but the liquid impermeability and flexibility are not limited. Thickness in the range of 0.003 mm to 3.0 mm is preferable from the point of property and air permeability, and the thickness in the range of 0.01 mm to 1.0 mm is more preferable.

  In the sanitary napkin 1 according to the present embodiment, the top sheet 21 and the back sheet 23 sandwich a laminated body of an absorber 22 and an elastic sheet 24 joined to the absorber 22, which will be described later. And the outer peripheral edge part of each sheet | seat is joined by the hot-melt-type adhesive agent. The joining means is not particularly limited, and in addition to the above-described adhesive, any joining means such as a heat seal method and an ultrasonic joining method can be adopted. Hot melt type such as styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butylene-ethylene copolymer (SEBS), etc. It is preferable to use an adhesive.

[Adhesive part]
In the sanitary napkin 1 according to the present embodiment, the plurality of adhesive portions 9 that are arranged on the non-skin facing surface of the back sheet 23 and extend continuously or intermittently in the width direction W are long as shown in FIG. A plurality of lines are arranged at predetermined intervals in the direction L (in other words, the adhesive portions 9 extending in the width direction W and the non-adhesive portions 10 extending in the width direction W are alternately arranged along the longitudinal direction L). The adhesive portion arrangement area 11 for fixing clothes (underwear) is formed together with the non-adhesive portion 10 which is arranged in a stripe shape and exists between the adhesive portions 9 adjacent to each other in the longitudinal direction L. This adhesion part arrangement | positioning area | region 11 fixes the non-skin opposing surface of the absorption main-body part 2 to the skin opposing surface of a wearer's clothing (underwear), when a wearer wears the sanitary napkin 1. FIG. In addition, the arrangement | positioning form of the above-mentioned adhesion part is not restrict | limited especially unless the effect of this invention is inhibited, Adhesion part is arrange | positioned with arbitrary forms, such as spiral shape, intermittent shape, and dot shape other than the above-mentioned stripe shape. can do.

Furthermore, in this invention, the adhesion part is arrange | positioned at the at least 2 bottom part in the expansion | extension structure area | region of a back surface sheet, and the wall part which exists between the said at least 2 bottom part. By having such a configuration, the absorbent article according to the present invention is excellent in temporary fixability and permanent fixability by a mechanism described later, and when the wearer wears the absorbent article and pulls up the shorts, Less need to correct position.
Further, in the present invention, the arrangement form of the adhesive portion in the bottom portion and the wall portion described above includes the entire surface of at least two bottom portions in the extended structure region of the back sheet, and the entire surface of the wall portion existing between the at least two bottom portions. Is not particularly limited as long as the effect of the present invention is not hindered, and the adhesive part may be disposed on substantially the entire surface in any of the bottom part and the wall part, or in the form of a stripe, spiral or intermittent, Some may be arranged on a part of the surface in an arbitrary form such as a dot shape.

Here, the mechanism by which the absorbent article according to the present invention is joined to the shorts will be described. FIG. 4 is a diagram schematically illustrating a state in which the elongated structure region of the back sheet 23 and the shorts are joined in the sanitary napkin 1 according to the embodiment of the present invention. Specifically, FIG. 4A shows a state in which the bottom B ₂ of the back sheet 23 is temporarily fixed to the shorts via the adhesive portion 9, and FIG. FIG. 4 (c) shows a wearing state in which the shorts are further extended.

In the present embodiment, as shown in FIG. 4A, when the wearer wears the sanitary napkin 1, when the sanitary napkin 1 is placed on the shorts U held by the thighs of both legs, napkin 1, is sufficiently fixed to the shorts U by an adhesive portion 9 arranged on the flat bottom B _2, the sanitary napkin 1 has a good temporary fixation of the shorts. Further, as shown in FIG. 4 (b), when the wearer then pulls up the shorts U to the buttocks of the wearer, the shorts U generally extend at least in the front-rear direction. Since the sanitary napkin 1 is excellent in temporary fixability, the sanitary napkin 1 can extend following the elongation of the shorts U. As further shown in FIG. 4 (c), when the sanitary napkin 1 extends so as to follow the elongation of the panties U, the distance between the wall part B ₃ and shorts U approaches, eventually, the sanitary napkin 1 However, it is sufficiently fixed to the shorts by the adhesive portion 9 arranged on the wall portion B ₃ , and the sanitary napkin 1 has excellent main fixability to the shorts U. With such a mechanism, the sanitary napkin 1 is excellent in temporary fixability and permanent fixability, and the wearer is less likely to correct the position of the sanitary napkin 1 after pulling up the shorts when wearing the absorbent article. In addition, in this embodiment, although the adhesive part 9 is arrange | positioned so that two or more may be located in the longitudinal direction L at predetermined intervals, the said absorbent article is excellent in temporary fixability, and follows the elongation of shorts. Since it can extend | expand, even if the adhesion part is arrange | positioned with what arrangement | positioning form, there is little possibility that it will join to shorts, with the arbitrary parts of a back surface sheet rising.

In the present invention, the adhesive surface of the adhesive part arranged at the bottom part and the adhesive surface of the adhesive part arranged at the wall part preferably have an area ratio of 5 to 30% and 70 to 95%. And more preferably have an area ratio of 8-25% and 75-92%. In the absorbent article, when the adhesive part is present at the bottom part and the wall part at a predetermined area ratio, the absorbent article is excellent in temporary fixability and permanent fixability, and the wearer absorbs the absorbent article. When the article is worn, there is little need to correct the position of the absorbent article after pulling up the shorts. In addition, the area of the adhesive surface of the adhesive part arrange | positioned at this bottom part and the area of the adhesive surface of the adhesive part arrange | positioned at a wall part are the planes of the back surface sheet in the pressurization state of measurement pressure 3g / cm < ² >. Based on the photo, it can be measured as the total area of the adhesive surface of the adhesive part arranged at the bottom and the total area of the adhesive surface of the adhesive part arranged at the wall part, and calculated as the ratio of these be able to.

[Elastic sheet]
In the sanitary napkin 1 according to this embodiment, the stretchable sheet 24 that can be stretched at least in the longitudinal direction L is, as shown in FIGS. 1 and 3, a rear region A that is a region corresponding to the wearer's buttocks. ₃ and disposed in the thickness direction T at least at a position overlapping with the elongated structure region B, between the absorbent body 22 and the back sheet 23 (that is, on the skin facing surface side of the back sheet 23). This is a stretchable sheet member that imparts stretchability to the rear region A _{3 of the} napkin 1 for use (more specifically, the region corresponding to the stretchable region EL _A of the absorber 22 in the rear region A ₃ ). In addition, it is preferable that the elastic sheet 24 is liquid-impermeable, and as described above, the elastic sheet 24 is disposed at a position overlapping the elastic region EL _A in the rear region A ₃ of the absorber 22 in the thickness direction T, and the elastic region It is not disposed in a portion that does not overlap with EL _A in the thickness direction T. When the liquid-impermeable stretchable sheet 24 is arranged in this way, the wearer takes out the sanitary napkin 1 from the individual package, unfolds it, and places it on the shorts U before the sanitary napkin 1 is placed. Even if the sanitary napkin 1 is extended in the longitudinal direction L in order to extend the folding line of the individual package, the shape of the sanitary napkin 1 is likely to return to the state before extension due to the elasticity of the elastic sheet 24. When the wearer attaches the sanitary napkin 1 to the shorts U and temporarily fixes the sanitary napkin 1, it is easy to accurately position the wearer.

  The above-mentioned stretchable sheet is not particularly limited as long as it is a stretchable sheet member that can be stretched in at least one direction (the direction corresponding to the longitudinal direction L of the absorbent article). For example, thermoplastics such as urethane resin and polyolefin resin An elastic film formed from a resin; an elastic film formed from a polyester-based resin can be used.

  Further, in the absorbent article, the position in the thickness direction where the above-described stretchable sheet is disposed is not particularly limited as long as it is between the topsheet and the backsheet, and the absorber and the backsheet as in the above embodiment. May be disposed between the top sheet and the absorbent body, but from the point that a predetermined absorption performance can be obtained even in the rear region of the absorbent article, It is preferable to arrange | position between an absorber and a back surface sheet like the above-mentioned embodiment.

  In the present invention, the above-described stretchable sheet is not an essential component as long as the stretchable region of the absorbent body is configured to be stretchable. Therefore, the absorbent article of the present invention includes the stretchable sheet. It does not have to be provided.

[Absorber]
Next, the absorber which can be used for the absorbent article of the present invention will be described. 6 is a plan view of the absorbent body 22 used in the sanitary napkin 1 in a non-expanded state (natural state), and FIG. 7 is a plan view of the absorbent body 22 in an expanded state. Incidentally, FIG. 7, the extended state of the sanitary napkin 1 shown schematically an end view of a cross section along the widthwise center axis C _L extending in the longitudinal direction L.

In the sanitary napkin 1 according to the present embodiment, the absorbent body 22 is disposed between the top sheet 21 and the back sheet 23 in the thickness direction T, as shown in FIG. It is an absorptive member which has a function which absorbs and holds a person's liquid excrement. As shown in FIG. 4, the absorbent body 22 has a vertically long outer shape in which the end edges on the front side and the rear side in the longitudinal direction L protrude in an arc shape on the front side and the rear side, respectively, in a plan view. as shown in FIG. 1, arranged in a central region including the widthwise center axis C _L extending in the longitudinal direction L of the sanitary napkin 1, so as to extend from the front region a ₁ described above over the back region a ₃ Has been.
In the present invention, the absorbent body is not limited to the above-described embodiment, and the absorbent body may have any outer shape such as a rectangle, an oval, an hourglass, etc. The article may be arranged so as to be biased toward the front or back in the longitudinal direction of the article.

In the present embodiment, as shown in FIG. 1, the absorbent body 22 has a width direction central axis C _L extending in the longitudinal direction L in the above-described front area A ₁ and excretory opening corresponding area A ₂ in a plan view. In addition to the front non-stretchable region NEL ₁ and the non-stretchable region NEL ₂ that extend across the layer, the rear region A ₃ extends in the longitudinal direction L and the width direction W, and has a thickness with a stretchable sheet 24 described later. It is configured to have a stretchable region EL _A that overlaps in the direction T.
Furthermore, the absorbent body 22 has in plan view, a rear non-stretchable region NEL ₃ extending in the entire width of the stretch region adjacent to the rear of the EL _A and absorber 22 in the back region A ₃ above ing. If the absorber 22 has such a rear non-stretchable region NEL ₃ , the strength of the absorber 22 can be secured to a certain degree in the rear region A ₃ of the sanitary napkin 1, so that the wearer can It is easy to position when the napkin is attached to the shorts and temporarily fixed.

Here, each non-stretchable region above the absorbent body 22 (i.e., the front region _A front non-stretchable region NEL ₁ in _1, corresponding to the excretion non-stretchable in the region _{A 2} regions NEL ₁ and the rear non-stretchable region in the back region _{A 3} NEL ₃ ) and the stretchable region EL _A will be described more specifically.

In the present embodiment, each non-stretchable region NEL _{1 to} NEL ₃ of the absorbent body 22 is not provided with stretch means such as a plurality of slit portions described later, and has substantially no stretchability (that is, (Non-stretchable) region. In this embodiment, such non-stretchable regions, as described above, in plan view, in the front region A ₁ and corresponding to the excretion area A _2, extends across the width direction center axis C _L extending in the longitudinal direction L is provided as a front non-stretchable regions NEL ₁ and non-stretchable regions NEL _2, further, in yet rear side of the stretchable region EL _a in the back region _{a 3,} the entire width of the absorbent body 22 (i.e., in FIG. 6 provided from the edge e ₁ of one side in the width direction W of the absorber 22 as a rear non-stretchable region N ₃ to the other side until the edge e ₂₎ extends. Incidentally, provided to forward non-stretchable regions N ₁ and the non-stretchable region N ₂ described above, continuous in the widthwise central portion of the absorbent body 22 (i.e., the portion extending over the width direction center axis C _L extending in the longitudinal direction L) It has been.
In the absorbent article of the present invention, the non-stretchable region of the absorbent body is not particularly limited as long as the non-stretchable region of the absorbent body is provided in a region adjacent to the rear of the stretchable region in at least the excretory opening corresponding region and the rear region. The stretchable region may not be provided in the front region, but the non-stretchable region is preferably provided across the excretory opening corresponding region from the front region as in the above-described embodiment. If the non-stretchable region of the absorber is provided across the region corresponding to the excretory opening from the front region, the region where the shape of the absorber can be easily maintained can be secured further, so that the movement of the wearer and the extension of the underwear In the above-mentioned front region and the excretion opening corresponding region that are relatively less affected by the above, the liquid excretion discharged from the wearer can be more stably and reliably absorbed over a long period of time.

In the sanitary napkin 1 according to the above-described embodiment, the stretchable region EL _A of the absorbent body 22 is a rear region that overlaps the stretchable sheet 24 and the thickness direction T as shown in FIGS. 1, 3, and 4. in the a _3, it has a plurality of slits S extending in the width direction W as elastic means, such plurality of slits S is applied from the wearer (or take over a stretch underwear) external forces (Incidentally, The external force includes an external force in the extension direction and an external force in the contraction direction.) And the contraction force applied from the stretchable sheet 24 opens and closes the stretch region EL _A of the absorbent body 22 at least in the longitudinal direction L. It can be expanded and contracted.

  Here, in this specification, the “slit part” means a cut that penetrates the absorber in the thickness direction, and the direction in which the slit part extends (that is, the longitudinal direction of the slit part) is orthogonal to the direction. Direction (that is, the width direction of the slit portion).

  In the absorbent article of the present invention, the absorbent body is not particularly limited except that the absorbent body has the above-described stretchable region and non-stretchable region (including the back non-stretchable region), and any known in the art. Absorbers can be used. Examples of such an absorbent include those in which an absorbent material containing a water-absorbing fiber such as pulp and / or a superabsorbent polymer is covered with a liquid-permeable covering sheet such as at least one tissue. .

  The thickness of the absorber is not particularly limited as long as it does not hinder the effects of the present invention. For example, a thickness in the range of 0.1 mm to 10 mm can be adopted, but stretchability, absorbability, flexibility, etc. From this point, a thickness in the range of 0.3 mm to 3 mm is preferable.

[Extension area and non-extension area of absorbent articles]
As described above, the sanitary napkin 1 according to this embodiment includes the stretchable topsheet 21, the absorbent body 22, the stretchable sheet 24, and the stretchable backsheet 23, and the absorbent body 22, stretchable. sheet 24, each of the backsheet 23, the front region a ₁ described _above, have a different elastic or extensible in corresponding to the excretion area a _2, and the rear area a _3.
As mentioned above, the absorber 22 in the present embodiment, as shown in FIG. 1, in plan view, in the front region A ₁ and corresponding to the excretion area A ₂ of the above, the width direction center axis extending in the longitudinal direction L and has a front non-stretchable region NEL ₁ and non-stretchable regions NEL ₂ extending across the C _L, in the rear area a ₃ described above, the longitudinal direction L and the width direction W extending in and above the stretchable sheet 24 And a stretchable region EL _A that overlaps in the thickness direction T. Furthermore, the absorbent body 22 has in plan view, a rear non-stretchable region NEL ₃ extending in the entire width of the stretch region adjacent to the rear of the EL _A and absorber 22 in the back region A ₃ above ing.
Further, as described above, in the present embodiment, the back sheet 23 has the extension structure region B that can be extended in the longitudinal direction L in the rear region A ₃ , while the front region A ₁ and the excretion port corresponding region A. ₂ does not have the elongated structure region B.

The sanitary napkin 1 having the components having the respective expansion and contraction and / or extension characteristics, when viewed as a whole, is a front edge in the longitudinal direction L located on the front side of the sanitary napkin 1 described above in plan view. The front low area NEX ₁ extending in the longitudinal direction L in the front area A ₁ including the area including the portion 5 and the excretory opening corresponding area A ₂ and the above-described rear area A ₃ extending in the longitudinal direction L and the width direction W. In addition, a rear region A ₃ including a region including an extension region EX overlapping with the above-described stretchable sheet 24 in the thickness direction T and a rear end edge 6 in the longitudinal direction L located on the rear side of the sanitary napkin 1 described above. A rear low extension region NEX ₂ that is adjacent to the rear of the inner extension region EX and extends in the entire width direction of the sanitary napkin 1. That is, the sanitary napkin 1 according to the present embodiment has, in the thickness direction T, a region where the front non-stretchable region NEL ₁ and the non-stretchable region NEL ₂ of the absorbent body 22 exist, a stretchable region EL _A , and a rear non-stretchable region NEL _3. In regions overlapping with each other, there are a front low extension region NEX ₁ , an extension region EX, and a rear low extension region NEX ₂ , respectively. In addition, the sanitary napkin 1 in the present embodiment has an extension region EX in a region overlapping the stretchable sheet 24 in the thickness direction T.

  In this specification, the “low extension region” refers to a region having a relatively low extension rate relative to the “extension region”, and the low extension region includes an extension region having a relatively low extension rate. Non-extension regions are also included.

In the present embodiment, the sanitary napkin 1 has the front low extension region NEX ₁ extending in the longitudinal direction L, the rear low extension region NEX _2, and the extension region EX positioned therebetween. The absorbent article which concerns on invention is not restrict | limited to this, For example, it is good also considering the low expansion | extension area | region of the above-mentioned front area | region as an expansion | extension area | region. However, in the present invention, the low-elongation region is preferably present in a region including a front edge in the longitudinal direction located on the front side of the absorbent article and a region including a rear edge. The absorbent article is difficult to extend in the vicinity of both ends in the longitudinal direction, which is easily grasped by the wearer, and is easy to position accurately when the wearer attaches the absorbent article to the shorts and temporarily fixes the absorbent article.

  Moreover, in this invention, it is preferable that the adhesive force in the above-mentioned adhesion part arrangement | positioning area | region is larger than the force required in order to extend the said expansion | extension area | region 20%. If the adhesive strength in the adhesive area is larger than the force required to extend the stretch area by 20%, the shorts will stretch to a certain extent according to the shape of the wearer's buttocks (that is, 20% or less). Since the stretched area of the absorbent article is easy to follow the stretch of the shorts without peeling off the shorts, even if the wearer pulls the shorts up to the buttocks and wears the shorts Since the stretch region in the article can easily follow the stretch of the shorts without further peeling from the shorts, there is less need to correct the position of the absorbent article.

  Here, the force required to stretch the stretched region by 20% can be measured according to the method described in “6.3 Tensile Strength and Elongation Ratio” of JIS L 1913: 2010. It shall extract | collect from the expansion | extension area | region in said absorbent article, and a holding | grip space | interval shall be 60 mm. Moreover, the adhesive force of the adhesion part arrangement | positioning area | region arrange | positioned at the non-skin opposing surface of a back surface sheet can be measured according to the following measuring methods. In addition, FIG. 8 is a schematic diagram for explaining a method of measuring the adhesive strength of the adhesive portion arrangement region arranged on the non-skin facing surface of the back sheet.

<Adhesive strength measurement method>
(1) The top sheet and the absorbent body are peeled off from the absorbent article, and the back sheet having an adhesive is taken out. At this time, the adhesive, tissue, etc. adhering to the skin-facing surface of the back sheet (that is, the surface on the absorber side) are removed using a cotton swab or the like soaked with ethanol.
(2) The rectangular shape of the back sheet taken out from the absorbent article is larger than the area where the adhesive is disposed (that is, the area where the adhesive portion is disposed) and can be secured by the chuck of the constant speed extension tester. And a back sheet sample 23S as shown in FIG. 8 is obtained.
(3) The test adherence fabric (Kanakin No. 3) is cut into a size of 70 mm in width and 80 mm in length to obtain a test adherence sheet 12 as shown in FIG. In addition, the size of the test adherend sheet 12 can be appropriately changed according to the size of the above-described back surface sheet sample 23S.
(4) After placing the back surface sheet sample 23S on the upper surface of the test adherend sheet 12 so that the surface having the adhesive (adhesive part 9) is on the lower side, a 300 g roller is applied once in one direction. The laminated body sample 13 is obtained by bonding both together. When the back sheet sample 23S is arranged on the upper surface of the test adherend sheet 12, as shown in FIG. 8, the area where the adhesive of the back sheet sample 23S is arranged (adhesive part arrangement area) is all tested. So that one end in the longitudinal direction of each of the test adherend sheet 12 and the back surface sheet sample 23S extends in the longitudinal direction by 15 mm or more from the overlapping portion thereof. The test adherend sheet 12 and the back sheet sample 23S are arranged so as to be shifted in the longitudinal direction. Moreover, the speed at the time of bonding shall be 300 mm / min.
(5) The obtained laminate sample 13 of the test adherend sheet 12 and the back sheet sample 23S is left for 30 minutes in an atmosphere of constant temperature and humidity of 20 ° C. and 60% RH.
(6) Both ends of the laminate sample 13 in the longitudinal direction (that is, the test adherend sheet 12 extending in two opposite directions in the longitudinal direction from the overlapping portion of the test adherend sheet 12 and the backsheet sample 23S) And one end in the longitudinal direction of each of the back surface sheet samples 23S) are gripped by a chuck of a constant-speed stretch tension tester, and the laminate sample 13 is then laminated as shown in FIG. Are pulled in two opposite directions A and A ′ in the longitudinal direction, and the test adherend sheet 12 and the back sheet sample 23S are peeled, and the peel strength (maximum value cN) at that time is measured. The tensile test conditions of the constant speed extension tensile tester are such that the distance between chucks is 60 mm and the tensile speed is 500 mm / min.
(7) The above-mentioned peel strength is measured five times, and the average value is defined as the adhesive strength (cN) of the adhesive portion arrangement region arranged on the non-skin facing surface of the back sheet.

[Method of manufacturing absorbent article]

  Hereinafter, a part of manufacturing method of the sanitary napkin 1 according to the present embodiment will be described with reference to FIGS. FIG. 9 is an overall schematic diagram of a device for manufacturing a sanitary napkin 1 according to an embodiment of the present invention. FIG. 10 is a schematic diagram of an apparatus for manufacturing the back sheet of the sanitary napkin 1 according to an embodiment of the present invention. In addition, about the method which is not demonstrated below, a known method can be used. The manufacturing method of an absorptive article is provided with a continuous absorber formation process, a surface sheet pasting process, a back sheet pasting process, an adhesion part coating process, and a post-treatment process at least.

  The sanitary napkin 1 manufacturing apparatus 700 relates to the conveyance of the sanitary napkin 1 and materials constituting the sanitary napkin 1, as shown in FIG. 9, the conveyance direction (MD direction) of the sanitary napkin 1 and materials constituting the sanitary napkin 1 And a transverse direction (CD direction) perpendicular to the conveyance direction and along the conveyance surface, and a vertical direction (TD direction) perpendicular to the conveyance direction and the transverse direction. “Upstream side in the transport direction” and “downstream side in the transport direction” are also simply referred to as “upstream side” and “downstream side”, and “upper side in the vertical direction” and “lower side in the vertical direction” are simply “upper side”, “ Also referred to as “lower”.

  The manufacturing apparatus 700 conveys the sanitary napkin 1 and members constituting the sanitary napkin 1 (example: absorber, top sheet, back sheet) as follows. The sanitary napkin 1 is conveyed so that the width direction W of the sanitary napkin 1 is along the conveying direction (MD direction) and the longitudinal direction L is along the transverse direction (CD direction).

  In the following, during the conveyance of the sanitary napkin 1 or the members constituting the sanitary napkin 1, the conveyance direction, the transverse direction, and the vertical direction overlap with the width direction W, the longitudinal direction L, and the thickness direction T, respectively. As the direction W, the longitudinal direction L, and the thickness direction T, the transport direction, the transverse direction, and the vertical direction are also used.

  As shown in FIG. 9, a manufacturing apparatus 700 includes a unit 700A that obtains a semi-finished product P1 by forming an absorbent body (hereinafter referred to as a continuous absorbent body) having a continuously continuous shape in the circumferential direction. A unit 700B that obtains a semi-finished product P2 by attaching a top sheet 21 to the semi-finished product P1, a unit 700C that obtains a semi-finished product P3 by attaching a back sheet 23 to the semi-finished product P2, and an adhesive portion 9 on the semi-finished product P3. A unit 700D for obtaining a semi-finished product P4 by applying a coating and a unit 700E for obtaining a sanitary napkin 1 by applying various post-treatments to the semi-finished product P4.

[Continuous Absorber Forming Process]
A unit 700A shown in FIG. 9 is a device or the like that continuously forms an absorbent body, and includes at least a fiber stacking device, an elastic sheet supply device, a pressing device (none of which are shown), a cutting device 70, A transport roll 73.

  The unit 700A forms a continuous absorbent by molding pulp and superabsorbent polymer (SAP), which are the materials of the absorbent, using a fiber stacking apparatus, and further, a stretchable sheet supply device and a pressing device are formed on the continuous absorbent. Thus, a stretchable sheet in the form of a continuous sheet is bonded and pressed to form a semi-finished product P1. The said semi-finished product P1 is supplied to the cutting device 70 provided with the cutter roll 71 and the anvil roll 72 which were arrange | positioned facing each other. When the semi-finished product P1 is supplied, the cutter roll 71 and the anvil roll 72 are cut in the transverse direction by the cutting blade of the cutter roll 71 while transporting the semi-finished product P1 while sucking it to the outer peripheral surface of the anvil roll 72. The semi-finished product P1 separated into the shape of the absorber 22 is formed. The cutting device 70 delivers the semi-finished products P1 separated individually from the anvil roll 72 to the transport roll 73.

[Surface sheet pasting process]
A unit 700B shown in FIG. 9 is an apparatus for obtaining a semi-finished product P2 by sticking a continuous sheet-like surface sheet to the semi-finished product P1, and includes at least a transport roll 73, a transport belt 74, and a gear stretching device (not shown). )).
The unit 700B stretches the continuous sheet-shaped surface sheet unwound from the roll by gear stretching, and affixes the continuous sheet-shaped surface sheet after the gear stretching to the semi-finished product P1 to form the semi-finished product P2. . The semi-finished product P2 is transported by the transport belt 74.

[Back sheet pasting process]
A unit 700C shown in FIG. 9 is an apparatus that obtains a semi-finished product P3 by sticking a continuous-sheet-like back sheet to the semi-finished product P2, and at least a continuous sheet-like back sheet to be processed wound in a roll shape. An unwinding device 75 for unwinding in the transport direction MD, a shaping device 76 for stretching the unwound continuous sheet-like back sheet to form the wall portion B ₃ and the bottom portion B ₂ , and a pair of transport rolls 77. 78, and conveyor belts 79, 80.

  As shown in FIG. 9, the shaping device 76 includes a pair of upper and lower stretching rolls 81 and 82. The upper stretching rolls 81 are arranged at regular intervals in the roll width direction, and are adjacent to the first teeth 81a provided in a plurality of rows parallel to each other along the outer peripheral surface of the upper stretching roll 81. A plurality of rows of first concave grooves 81b provided between the teeth 81a and 81a. On the other hand, the lower drawing rolls 82 are arranged at regular intervals in the roll width direction and adjacent to the second teeth 82a provided in a plurality of rows parallel to each other along the outer peripheral surface of the lower drawing roll 82. A plurality of rows of second concave grooves 82b provided between the two teeth 82a, 82a. The second teeth 82 a of the lower drawing roll 82 are provided so as to mesh with the first concave groove 81 b of the upper drawing roll 81. The first teeth 81 a of the upper drawing roll 81 are provided so as to mesh with the second concave groove 82 b of the lower drawing roll 82.

  In the present embodiment, the upper stretching roll 81 of the pair of upper and lower stretching rolls 81 and 82 has a shape in which the tip portion of the first tooth 81a is rounded, while the groove portion of the first groove 81b is It is flat. The lower drawing roll 82 has a shape in which the tip portion of the second tooth 82a is flat, while the groove portion of the second groove 82b is rounded.

  When the semi-finished product P3 is obtained using the unit 700C, a shaping process is performed in which the back sheet 23 unwound from the unwinding device 75 is stretched and shaped by the shaping device 76.

In the shaping step, the back sheet 23 is inserted between the pair of upper and lower drawing rolls 81 and 82 rotating while meshing in the shaping device 76, and the continuous sheet-like back sheet is meshed with the upper side. The first teeth 81a and the first concave grooves 81b of the first extending roll 81 and the second teeth 82a and the second concave grooves 82b of the lower extending roll 82 are stretched and shaped. At this time, the upper drawing roll 81 pushes the portion where the first teeth 81a are in contact with the continuous sheet-like back sheet into the second concave groove 82b of the lower drawing roll 82, thereby the wall portion B. ₃ is shaped. On the other hand, the stretching roll 82 downward, pushing the portion where the second teeth 82a is in contact with the continuous sheet-like backsheet in the first groove 81b of the upper draw roll 81, thereby the bottom B ₂ Shaped.

At this time, the bottom B _2, since the leading end portion of the second tooth 82a is flat, the contact portion of the backsheet of the continuous sheet is flat. On the other hand, the base B _4, the tip portion of the first tooth 81a is rounded, the curved contact portion of the backsheet of the continuous sheet is curved. More specifically, as shown in FIG. 10, the first surface side of the continuous sheet-like back sheet (that is, the side that becomes the surface facing the skin when the absorbent article is used) corresponds to the bottom. In the position, while being stretched, it is shaped along the tip of the second tooth 82a, and on the second surface side of the back sheet (that is, the surface on the non-skin facing surface side when an absorbent article is formed) The side) is shaped along the first teeth 81a while being stretched at a position corresponding to the base. Further, the second surface side of the continuous sheet-like back sheet is not necessarily in contact with the first concave groove 81b at a position corresponding to the bottom, and the first surface side of the back sheet corresponds to the base. In position, it is not necessarily in contact with the second concave groove 82b. As a result, the cross section perpendicular to the outer peripheral surface of the stretching roll in the continuous sheet-like back sheet is in a form in which shapes corresponding to the protruding portions are periodically arranged along the width direction of the stretching roll. In addition, the shaping | molding method of the back surface sheet of the absorbent article which concerns on this invention is not restrict | limited to the above-mentioned method, The shape and pitch of the teeth and the ditch | groove of an up-and-down each extending roll, The shape of the wall surface which connects a tooth | gear and a ditch | groove Can be appropriately changed as long as the tip portion of the second tooth is flat and the tip portion of the first tooth has a rounded shape. For example, the shape of the wall surface may be a curved shape, or a combination of one or more curved surfaces and a flat plane.

In the present invention, the pitch between the second teeth of the adjacent lower drawing rolls in the transverse direction (CD direction) is preferably 2.0 to 5.0 times the height of each second tooth, More preferably, it is 3.0 to 4.5 times, and still more preferably 3.8 to 4.2 times. When the wearer places the absorbent article obtained by the method according to the present embodiment on the shorts by setting the pitch between the adjacent second teeth in the transverse direction (CD direction) to a specific range. Since the distance between the wall portion and the shorts in the elongated structure region becomes shorter and the wearer pulls the shorts up to the heel part, it is easier to secure a contact area with the shorts. When the wearer pulls up the shorts to the buttocks and wears the shorts, the absorbent article can easily follow the stretch of the shorts without further peeling from the shorts, so the position of the absorbent article needs to be corrected. Less. Furthermore, extended structure area B of the continuous sheet-like backsheet obtained by such a method has a large exposure of the wall portion B ₃ in plan view, in the step of applying an adhesive to be described later, to the wall B ₃ The adhesive can be applied substantially uniformly and efficiently.

  However, in this embodiment, teeth are formed only in the region corresponding to the stretched structure region B existing on the rear side of the continuous sheet-like back sheet, of the outer peripheral surfaces of the pair of stretching rolls 81, 82, and the continuous sheet-like shape. No teeth are formed in the region corresponding to the front side of the back sheet. The drawing rolls 81 and 82 are rotated at the same peripheral speed so as to mesh each other's teeth, and the continuous back sheet is stretched by passing the continuous back sheet between these meshed teeth (gear stretching process). , Formed into a stretchable continuous sheet. Thereby, in the continuous back sheet after extending | stretching, extensibility expresses only to the area | region corresponding to the expansion | extension structure area | region B of the continuous sheet-like back sheet. In addition, extensibility does not express in the part corresponding to the front side.

  In addition, you may implement the preheating process which inserts a continuous sheet-like back surface sheet | seat to be processed between a pair of upper and lower heating rolls, and preheats before a shaping process. The temperature of the outer peripheral surface of a heating roll shall be about 60-120 degreeC, for example. Moreover, when performing a shaping | molding process, it is preferable to shape | mold, extending the extending | stretching rolls 81 and 82 at 60-120 degreeC so that shaping may be performed easily.

  The transport belt 79 transports the semi-finished product P2 supplied from the unit 700B between the pair of transport rolls 77 and 78. The bonding apparatus 83 applies an adhesive to the upper surface of the semi-finished product P2 conveyed by the conveying belt 79. The pair of transport rolls 77 and 78 are arranged so as to face each other, and the continuous back sheet supplied from the shaping device 76 is pressed and pasted to the upper surface of the semi-finished product P2 whose adhesive is applied to one surface. Then, an absorbent body member with a continuous sheet-like top sheet and back sheet, that is, a semi-finished product P3 is formed. The conveyor belt 80 conveys the semi-finished product P3 to the unit 700D.

[Adhesive part coating process]
A unit 700D shown in FIG. 9 is a device or the like that applies the adhesive portion 9 to the semi-finished product P3 to obtain the semi-finished product P4, and includes at least a back-surface adhesive portion forming device 84 and a transport belt 85.
As shown in FIG. 9, the roll 86 has a continuous release sheet CT that is a continuous sheet that becomes a release sheet, and the continuous release sheet CT is rewound by the downstream back surface adhesive portion forming device 84 or the like. Then, the continuous release sheet CT is supplied to the back surface adhesive part forming device 84. The adhesive device 87 applies an adhesive so as to form a plurality of adhesive portions 9 on one surface of the continuous release sheet CT before being supplied to the back surface adhesive portion forming device 84. The back surface adhesive portion forming device 84 includes a cutter roll 88 and an anvil roll 89 that are arranged to face each other, and a pressing roll 90 that is further arranged to face the anvil roll 89. When the back surface adhesive portion forming device 84 is supplied with the continuous release sheet CT coated with an adhesive between the cutter roll 88 and the anvil roll 89, the back surface adhesive portion forming device 84 sucks the continuous release sheet CT to the outer peripheral surface of the anvil roll 89. While being conveyed, the sheet is cut by the cutting blade of the cutter roll 88, thereby forming a release sheet having a plurality of adhesive portions. The back surface adhesive part forming device 84 presses and attaches the release sheet to the upper side of P3, that is, the back surface sheet, while transporting the semi-finished product P3 between the anvil roll 89 and the pressing roll 90 in the transport direction, P3 with a release sheet, that is, a semi-finished product P4 is formed. At this time, since the absorber 22 exists below the continuous sheet-like back sheet when the adhesive is applied, the pressing roll 90 is a protrusion B in the elongated structure region B of the continuous sheet-like back sheet. be pressed against the _1, unevenness of the back sheet of the continuous sheet by cushioning properties of the absorber 22 is absorbed, the adhesive substantially uniformly to the wall portion B ₃ is applied.

  In addition, the adhesion part coating process in the manufacturing method of the absorbent article in the present invention is not limited to the above-described aspect as long as the adhesive is applied to the wall part, and is, for example, other aspects such as spray coating. Also good.

[Post-processing process]
The transport belt 85 transports the semi-finished product P4 to a unit 700E including various post-processing devices such as a flap forming device, a peripheral sealing device, and a peripheral cutting device (all not shown), and the sanitary napkin 1 is obtained.

In addition, the absorbent article of the present invention is not limited to the above-described embodiment and exemplary description, and can be appropriately combined and changed without departing from the object and spirit of the present invention.
In addition to the sanitary napkin of the above-described embodiment, the present invention can be applied to various absorbent articles such as a panty liner and a (light) incontinence pad. In this specification, ordinal numbers such as “first” and “second” are used to distinguish items with the ordinal numbers, and mean the order, priority, importance, etc. of each item. Not what you want.

1 Sanitary napkin (absorbent article)
2 Absorption Main Body 21 Top Sheet 22 Absorber 23 Back Sheet 24 Elastic Sheet 3, 3 ′ Flap Part 4, 4 ′ Adhesive Part 5 Front Edge 6 Rear Edge 9 Adhesive 10 Non-adhesive 11 Arrangement of Adhesive Area A ₁ Front area A ₂ Excretion area A ₃ Rear area B Elongation structure area B ₁ Projection B ₂ Bottom B ₃ Wall EL _A Stretching area NEL ₁ Front non-stretching area NEL ₂ Non-stretching area NEL ₃ Back non-stretching Stretch area NEX ₁ Front low extension area EX Extension area NEX ₂ Back low extension area S Slit

Claims (7)

An absorbent article comprising a back sheet having a skin facing surface and a non-skin facing surface, and an adhesive portion disposed on the non-skin facing surface of the back sheet, and having a longitudinal direction, a width direction, and a thickness direction. ,
The absorbent article has an extension region that can be extended at least in the longitudinal direction in plan view,
In the back sheet, a plurality of protruding portions protruding toward the non-skin facing surface side extend in the width direction at positions overlapping with the extension region in the thickness direction, and are arranged in parallel in the longitudinal direction. Has an elongated structure region that is
Each of the plurality of projecting portions includes a bottom portion where the non-skin facing surface is flat, and a wall portion that is adjacent to both ends of the bottom portion in the longitudinal direction in the longitudinal direction,
The absorbent article, wherein the adhesive portion is disposed on at least two bottom portions and the wall portion existing between the at least two bottom portions.   The total area ratio of the bottom with respect to the surface area on the non-skin-facing surface side of the elongated structure region is 20 to 40%, and the pitch of the plurality of protrusions in the longitudinal direction is that of the plurality of protrusions. The absorptive article according to claim 1 which is 2.0 to 5.0 times the depth.   The pressure-sensitive adhesive surface of the pressure-sensitive adhesive portion disposed on the bottom portion and the pressure-sensitive adhesive surface of the pressure-sensitive adhesive portion disposed on the wall portion have an area ratio of 5 to 30% and 70 to 95%. Or the absorbent article of 2. In the thickness direction, the absorbent article further includes an adhesive portion arrangement region composed of a non-adhesive portion where the adhesive portion and the adhesive portion are not arranged at a position overlapping the elongated structure region,
The absorptive article according to any one of claims 1 to 3 whose adhesive strength in said adhesion part arrangement field is larger than force required to make said extension field extend 20% in said longitudinal direction.   The said absorbent article is a skin opposing surface side of the said back surface sheet | seat, Comprising: In the said thickness direction, it further has an elastic sheet in the position which overlaps with the said expansion | extension structure area | region. Absorbent article according to item. The absorbent article has, in plan view, an excretion opening corresponding area, and a rear area located on the rear side of the excretion opening corresponding area,
The absorbent article according to any one of claims 1 to 5, wherein the elongated structure region is present at least in the rear region. The absorbent article further has a low stretch region that has a lower elongation rate than the stretch region or is non-stretched in plan view,
The absorbent article according to any one of claims 1 to 6, wherein the low-elongation region is present at least in a region including a front edge in the longitudinal direction and a region including a rear edge.

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