JP5108673B2 - Absorbent articles - Google Patents

Description

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

Conventionally, sanitary napkins provided with leak-proof walls on both side edges in the longitudinal direction are known in order to prevent side leakage in which body fluids such as menstrual blood being worn move in the width direction and leak from the side edges. ing.
Moreover, in order to improve the fit of the leak-proof wall to the wearer, a hollow loop-shaped leak-proof wall is known. For example, in Cited Document 1, the fit is high, and even when stress from the left and right such as the movement of the wearer's foot is applied, it is buffered with a hollow loop shape, and the sanitary napkin is not twisted, A sanitary napkin having a hollow loop-shaped leak-proof wall having a high leak-proof property is disclosed.

  In recent years, especially in sanitary napkins for night use, the length of sanitary napkins tends to be long, and along with the length of sanitary napkins, the leak-proof wall is also long. When the leak-proof wall becomes long, liquid leakage from the front-rear direction is less likely to occur, while side leakage in the excretion part region that is in contact with the body fluid excretion part of the wearer is relatively likely to occur. Moreover, when a leak-proof wall becomes long, the standing property of the hollow leak-proof wall in an excretion part area | region will fall.

Japanese Patent Laid-Open No. 11-299821

  Accordingly, an object of the present invention is to provide an absorbent article excellent in the standing property of the hollow leak-proof wall and the covering property of the side edge of the crotch part, and excellent in leak-proofing property and antifouling property of clothes.

  The present invention relates to an absorbent main body having an absorbent body between a surface sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and both sheets, and an elastic sheet on each longitudinal side of the absorbent body. A substantially loop-shaped absorbent article comprising a hollow loop-shaped leak-proof wall formed by joining together and wing portions extending from the left and right sides of the absorbent main body. Is a first fixing part fixed to the skin contact surface side of the absorbent body in the excretion part region that is the region having the wing part in the longitudinal direction of the absorbent article, the non-skin contact surface side of the absorbent body And a second fixing portion fixed to the wing portion forming base material on the outer side in the width direction of the absorbent article than the side edge in the longitudinal direction of the absorbent body, and a second fixing portion Absorption having a non-fixed part not joined to another member between the fixed part and the third fixed part It is obtained by achieving the above object by providing an article.

  The absorbent article of the present invention is excellent in the standing property of the hollow leak-proof wall and the covering property of the side edge portion of the crotch part, and is excellent in leak-proofing property and antifouling property of clothes.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
As shown in FIG. 1, the sanitary napkin 1 of the present embodiment is formed symmetrically with respect to a center line CL extending in the longitudinal direction of the sanitary napkin 1. Therefore, in the following, the configuration of the sanitary napkin 1 on the left side in FIG. 1 will be mainly described in detail, and description of the configuration on the right side will be omitted as appropriate. The component on the right side corresponding to the component on the left side is given a dash (').

As shown in FIGS. 1 and 2, an absorbent article (sanitary napkin) 1 of the present embodiment has an absorbent main body having a top sheet 2, a back sheet 3, and an absorbent body 4 positioned between both sheets 2 and 3. 5, hollow loop-shaped leak-proof walls 7, 7 ′ formed by joining stretchable sheets 6, 6 ′ to both longitudinal sides 5 a, 5 a ′ of the absorbent body 5, and the absorbent body 5 Wings 8 and 8 'extending from both the left and right sides of the wing, are substantially vertically long.
Each of the stretchable sheets 6 and 6 ′ is disposed on the skin contact surface 4 u side of the absorbent body 4 in the excretion part region A which is a region having the wing parts 8 and 8 ′ in the longitudinal direction of the absorbent article (sanitary napkin) 1. The first fixing part 6 a fixed to the non-skin contact surface 4 d side of the absorbent body 4, and the side edge 4 a of the absorbent body 4 in the longitudinal direction of the absorbent article 4. It has the 3rd fixing | fixed part 6c joined to the wing part formation base material 82 in the width direction outer side, and is not joined to another member between the 2nd fixing | fixed part 6b and the 3rd fixing | fixed part 6c. It has a non-fixed portion 6d.

The sanitary napkin 1 of this embodiment will be described in further detail.
As shown in FIG. 2, the sanitary napkin 1 includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and an absorbent body 4 positioned between the two sheets 2 and 3. The absorptive main body 5 is provided. The absorbent body 4 and the surface sheet 2 covering the skin side surface are joined by an adhesive and a leak-proof groove 9 (not shown). Further, the absorbent body 4 and the back sheet 3 are joined by an adhesive 74 in the center region in the width direction of the napkin 1.
The sanitary napkin 1 has a substantially vertically long shape. The substantially vertically long shape may be a vertically long portion excluding the wing portion.
The sanitary napkin 1 has a pair of wings 8 and 8 'at a position slightly forward of the center in the longitudinal direction. Adhesive portions 81 for fixing the wing portions 8, 8 'to the non-skin facing surface of the crotch portion of the shorts are formed on the back surfaces of the wing portions 8, 8'.
As shown in FIG. 1, the “excretion region” in the present invention is preferably a region A having wings 8 and 8 ′ in the longitudinal direction of the absorbent article (sanitary napkin 1). In the central part of the napkin 1 in the width direction of the excretion part region A, a wearer's liquid excretion part (such as a vaginal opening) is usually disposed oppositely.

Next, the leakage barriers 7 and 7 'of the sanitary napkin 1 will be described.
In the sanitary napkin 1, as shown in FIGS. 1, 2, and 4, the belt-like stretchable sheet 6 extends along the longitudinal direction on the side portion 5 a in the longitudinal direction (CL direction) of the absorbent main body 5. , Disposed and fixed, and by contraction of the stretchable sheet 6, a convex hollow loop-shaped leak-proof wall 7 is formed on the skin contact surface side.

  As shown in FIGS. 2 and 4, the stretchable sheet 6 used for the sanitary napkin 1 is composed of two substantially non-extensible sheets 61 and 62 that extend a plurality of elastic members 63 therebetween. It is a composite sheet formed by being bonded via an adhesive such as a hot-melt adhesive in a state of being sandwiched in a state. The two sheets 61 and 62 have the same shape and size. As for the two sheets 61 and 62, it is preferable that at least the outer sheet 61 in contact with the skin is made of a nonwoven fabric, and it is preferable that one or both of them is water-repellent or liquid-impermeable.

The joining state of the elastic sheet 6 in the excretion part area | region A is demonstrated.
As shown in FIG. 2, the stretchable sheet 6 in the excretion area A is bonded to the skin contact surface side of the absorbent body 4 through an adhesive (not shown) from a side edge 6 e in the longitudinal direction. Has been. More specifically, it is joined on the surface sheet 2 that covers the skin contact surface side surface of the absorbent body 4. A portion having a predetermined width joined to the skin contact surface side of the absorber 4 is a first fixing portion 6a.
The stretchable sheet 6 in the excretion region A is joined to the skin contact surface side of the absorbent body 4 via an adhesive 64 at a portion having a predetermined width near the other side edge 6f in the longitudinal direction. More specifically, it is joined to the surface of the absorbent body 4 on the non-skin contact surface side. A portion having a predetermined width joined to the skin contact surface side of the absorbent body 4 is the second fixing portion 6b.
Furthermore, the stretchable sheet 6 in the excretion part region A has a portion with a predetermined width outside the side edge 4 a in the longitudinal direction of the absorbent body 4 in the width direction of the napkin 1 via the adhesive 65. Bonded to the forming substrate 82. A portion having a predetermined width joined to the wing portion forming base material 82 is the third fixing portion 6c.

The wing portion forming base material 82 is a sheet material 83, 3a constituting the wing portion 8 or a sheet material continuous with the sheet material 83, 3a in the excretion portion region A.
In the sanitary napkin 1 of the present embodiment, as shown in FIG. 2, the wing portion 8 includes a portion 3 a of the back sheet 3 that extends from the side edge 4 a of the absorbent body 4, and a layer 3a laminated on the portion 3 a. Is a non-woven sheet 83 bonded to each other, and a portion of the non-woven sheet 83 located outside the side edge 4a of the absorbent body 4 and located in the excretion region A (shaded portion in FIG. 3) is a wing. This is a part forming substrate 82.

  When the sanitary napkin 1 is fixed to the crotch portion of the shorts, as shown in FIG. 5, the wing portion 8 (8 ') is folded back along the side edge C1 of the crotch portion C of the shorts to The third joint portion 6c of the stretchable sheet 6 is fixed to the non-skin facing surface of the absorbent body side edge 4a with respect to the folding line 84 (see FIG. 3) when the wing portion 8 (8 ′) is folded back. It may be formed on the side. Moreover, the nonwoven fabric sheet 83 is laminated | stacked only on the front end side of the extending direction of the wing part 8 (8 '), and the stretch sheet | seat is formed in the part which is not coat | covered with this nonwoven fabric sheet 83 of the back surface sheet 3. 6 may be joined and the 3rd junction part 6c may be formed.

  The third fixing portion 6c of the stretchable sheet 6 is formed on a fold line 84 (see FIG. 3) when the wing portion 8 (8 ′) is folded along the side edge of the crotch portion of the shorts. This is preferable from the viewpoint of covering the side edge of the crotch portion with a part of the hollow leak-proof wall 7. It is only necessary that the third fixing portion 6c is positioned on the fold line 84 in at least a part of the excretory region A to be formed on the fold line 84 (see FIG. 3).

  The wing part extends in the napkin width direction through the side edge part C1 of the crotch part of the shorts having a convex curve inward toward the excretion region at the crotch part and the rising start points P1, P2 of the wing part 8. Since it is folded at a substantially straight line 84 connecting the points a1 ′ and a2 ′ where the two straight lines a1 and a2 intersect, whether or not the third fixing portion 6c is located on the folding line depends on the points a1 ′ and a2 ′. It can be determined by whether or not the line is on the connecting line 84. In sanitary napkins with wings, the wing folds are designed to have a lower bending stiffness than the absorbent body to facilitate attachment to the shorts, so do they fold outside the absorbent side edge? When the wing base material is arranged and extended on the lower surface of the absorbent body and is a wing independent of the absorbent body, it is folded back outside the second fixed point 6b. Since the folded wing base material does not feel uncomfortable, it is designed such that the distance from the absorber side edge to the front and rear rising start position of the wing is about 5 to 15 mm. Since the shorts crotch has a convex curve inward toward the excretion site at the crotch portion, if the distance between the starting points P1 and P2 of the wing is shorter than the shorts crotch length, the side closer to the absorber than the starting points P1 and P2 Wrapped at

  If the location of the rising start points P1 and P2 of the wing portion is unclear, as shown in FIG. 3, the oblique sides L1 and L2 of the trapezoidal wing portion extending in the product width direction and the product side edge portion sandwiching the wing portion It is assumed that P1 is shifted backward and P2 is shifted forward by 2 mm from the intersection with the line L3 connecting the front and rear.

As shown in FIG. 2, the stretchable sheet 6 in the excretion part region A is not fixed to another member between the second fixing part 6 b and the third fixing part 6 c in the width direction. It has a portion 6d.
As a joining method of each of the first to third fixing portions 6a, 6b, and 6c, various known joining means such as a heat seal and a high frequency seal can be used instead of the adhesive. Moreover, it is preferable that the width | variety of each of the 1st-3rd fixing | fixed part 6a-6c is 0.5-10 mm.

As shown in FIG. 1, the elastic member 63 in the stretchable sheet 6 is arranged over a length longer than the full length of the excretory part region A, and the stretchable sheet 6 is long in at least the excretory part region A. Expresses elasticity in the direction. On the other hand, the elastic sheet 6 has a region where the elastic member 63 is not disposed in the vicinity of the front and rear end portions of the sanitary napkin 1, and the end seal portion 11 existing at the front and rear ends of the sanitary napkin 1 has the stretchability. The two sheets 61 and 62 constituting the sheet 6 are integrated with the top sheet 2, the back sheet 3 and the like by heat embossing.
The elastic sheet 6 has a loop shape with a substantially circular cross section as shown in FIG. 2 between the first fixing portion 6a and the third fixing portion 6c when the elastic member 63 contracts in the longitudinal direction. As a result, a hollow leak-proof wall 7 is formed in the excretory part region A. The hollow leak-proof wall 7 is formed with a convex arcuate shape with a cross-section upward.

  The sanitary napkin 1 of the present embodiment can be used by being fixed to the crotch portion C of underwear such as shorts in the same manner as a conventional sanitary napkin with a wing portion. That is, when the sanitary napkin 1 is mounted, the wing portions 8, 8 'are bent along the side edge of the crotch portion C while pulling left and right, and the bent wing portions 8, 8' are crotched portion C. It fixes to the non-skin opposing surface of this through the adhesive part 81. The non-skin facing surface of the crotch part includes an outer surface of the inner cloth (surface on the outer cloth side) when the crotch part has a double structure of the outer cloth and the inner cloth disposed on the skin side.

In the sanitary napkin 1 of the present embodiment, since the stretchable sheet 6 has the above-described third fixing portion 6c, the hollow leak-proof wall 7 has a crotch portion as shown in FIG. It is mounted while being stretched also in the width direction of C. Thereby, it mounts | wears so that a shorts crotch side edge may be wrapped by the leak-proof wall 7. Therefore, the side leakage prevention effect is improved.
Further, since the stretchable sheet 6 is fixed by the third fixed portion 6c and the second fixed portion 6b that are spaced apart via the non-fixed portion 6d, the stretchable sheet 6 in the longitudinal direction is stabilized and prevented. It becomes easy to maintain the shape in which the leak wall 7 made the loop shape, and stood toward the skin side.
In addition, when there is no 3rd fixing | fixed part 6c, the expansion-contraction area | region edge of the elastic sheet 6 necks in, and the contraction stress of front and back is disperse | distributed. That is, the force of standing up the wall portion on the product side edge of the leak-proof wall 7 is reduced, and the hollow shape of the leak-proof wall 7 cannot be maintained in a stable shape in the product width direction and is lifted upward. It is easy to become. As a result, there is a possibility that the leak-proof wall 7 falls inward due to the movement at the time of mounting, and leakage is likely to occur.

Further, the non-fixed portion 6d becomes a deflection region in the front-rear direction of the product due to the contraction force of the hollow leak-proof wall 7 near the third fixed portion 6c. By having such a bending region between the third fixing portion 6c and the second fixing portion 6b, the non-fixing portion 6d becomes a flexible shaft, and the wing is easily caught in the shorts and is easy to attach.
By these, while maintaining the favorable fitting property with respect to the skin of a hollow leak-proof wall, the coverage of a crotch part side edge part can be improved, and the outstanding leak prevention property and antifouling property of clothing are obtained.

As shown in FIG. 1, the sanitary napkin 1 of the present embodiment has a pair of leak-proof grooves 9 and 9 ′ that extend along the longitudinal direction of the sanitary napkin 1 in the excretory region A. As shown in FIG. 2, the above-described second fixing portion 6 b is formed outward from the respective leak-proof walls 9 and 9 ′ in the width direction of the sanitary napkin 1. For this reason, the leakage preventing groove 9 causes the absorber side edge to be bent to the non-skin surface side with the leakage preventing groove 9 as a flexible shaft when the wing is wound around the shorts and attached. As a result, the end of the leak-proof wall 7 on the non-skin surface side is pulled toward the absorbent body by the second fixing portion 6b interlocked with the absorber, and the leak-proof wall 7 is deformed so as to more easily enclose the shorts.
The leak-proof grooves 9 and 9 ′ are formed by embossing.

The stretchable sheet 6 is formed between the first fixing part 6a and the third fixing part 6c from the viewpoint of forming a hollow loop-shaped leak-proof wall 7 having excellent fit to the skin and covering of the side edge of the crotch part. The length W1 (length in the width direction of the stretchable sheet measured along the stretchable sheet, see FIG. 2) is preferably 20 to 80 mm, and more preferably 35 to 55 mm.
The stretchable sheet 6 has a length W2 (measured along the stretchable sheet) between the second fixed portion 6b and the third fixed portion 6c from the standpoint of standing of the leak-proof wall and fit at the time of mounting. The length of the stretchable sheet in the width direction (see FIG. 2) is preferably 3 to 40 mm, and more preferably 5 to 25 mm.
Moreover, it is preferable that ratio (W1 / W2) of the said length W1 and the said length W2 is 15-1, especially 7-1.

Further, the leak-proof wall 7 fits to the body at the time of wearing, and the height H1 (see FIG. 2) from the wing part 8 to the top part is 5 to 40 mm from the viewpoint that the wall part does not collapse or collapse extremely. It is preferable that it is 7 to 20 mm.
In addition, from the same viewpoint, the leakage prevention wall 7 preferably has a height H2 (see FIG. 2) from the liquid absorption surface to the top of the leakage prevention wall 7 of 3 to 35 mm, and preferably 5 to 25 mm. More preferred.
The height H1 and the height H2 are measured on the sanitary napkin 1 in a natural state.

As shown in FIG. 1, the leak-proof walls 7 and 7 ′ in the sanitary napkin 1 of the present embodiment are folded in the vicinity of both ends of the region (elastic region) where the elastic member 63 is fixed in the longitudinal direction. It has fixing | fixed part 7a1, 7a2, 7a1 ', 7a2'.
Each of the folding fixing portions 7a1, 7a2, 7a1 ′, 7a2 ′ has an inner folding portion 71 and / or an outer folding portion 72 as shown in FIG.
The inner folding part 71 folds a part of the loop-shaped leak-proof wall 7 from the inner side d of the sanitary napkin 1 in the width direction (direction perpendicular to the longitudinal center line CL) to the inside of the leak-proof wall 7. The outer folded portion 72 is formed by folding a part of the loop-shaped leak-proof wall 7 from the outer side e in the width direction of the sanitary napkin 1 to the inside of the leak-proof wall 7. The surfaces of the sheets 61 facing each other in the inner folding part 71 are joined to each other, and the same applies to the outer folding part 72. For these joining, various known joining means such as an adhesive 73 and heat sealing can be used.
By having such folding fixing parts 7a1, 7a2, 7a1 ′, 7a2 ′ in front and / or rear, preferably both front and rear, of the excretory part area A, the leak-proof wall 7 in the excretion part area A is on the skin side. It becomes easy to maintain the shape of a convex curved surface that is convex toward the surface.

A material for forming the sanitary napkin 1 of the present embodiment will be described.
As the top sheet 2, the back sheet 3, and the absorbent body 4, those conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the absorbent body 4, a fiber aggregate of fiber materials such as pulp or a material in which a superabsorbent polymer is supported is wrapped with a covering material such as tissue paper or a water-permeable nonwoven fabric. be able to.

  In the sanitary napkin 1, as described above, a plurality of elastic members 63 are stretched between two substantially non-extensible sheets 61 and 62 as the stretchable sheet 6 for forming a leak-proof wall. Although the fixed composite sheet was used, various elastic sheets can be used instead of the elastic sheet in the present invention. That is, the stretchable sheet in the present invention is not particularly limited as long as it is sheet-like and has stretchability. However, from the viewpoint of leakage prevention effect, it is preferable that the liquid is hardly permeable. The liquid impermeability here includes liquid impermeability.

  Examples of the sheet material that can be used as the elastic sheet include an elastic film, a nonwoven fabric, a woven fabric, or a laminated sheet thereof. Specifically, the material itself made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as ethyl acrylate-ethylene, etc. has a stretchable material. (Films, filaments, nonwoven fabrics, woven fabrics) and laminates of these stretchable materials (elastic members) and nonwoven fabrics. When used on the skin contact surface side of the top sheet, the stretchable film is made of polyethylene / polyester, polyethylene to improve the touch and to improve heat sealability and fixability with an adhesive. / Laminated with thermoplastic nonwoven fabric made of polypropylene or polypropylene, and preferably used as a laminate. Such a thermoplastic non-woven fabric preferably uses crimped fibers so that the non-woven fabric itself is stretchable. When laminating a non-crimped non-crimped non-woven fabric, an elastic member is used before laminating. Alternatively, the sheet material may be stretched to a predetermined stretch ratio and bonded to the nonwoven fabric material by hot melt, heat seal, or the like to form a sheet material that exhibits stretchability.

In addition, the stretch behavior of the stretch sheet does not have to be the same in any part. From the viewpoint of the shape stability of the leak-proof wall and the combination with other components, the stretch does not vary or does not stretch Is preferably formed. For example, stretchability is imparted to a portion located above the first fixing portion, while stretchability is not imparted to a portion located below the first fixing portion, and a portion having no stretchability is joined to the second portion. And it can also be set as a 3rd junction part.
Moreover, you may provide the 4th fixing | fixed part spaced apart from these both fixed parts between the 2nd fixing | fixed part and the 3rd fixing | fixed part.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the sanitary napkin 1, the first fixing portion 6a of the stretchable sheet 6 has a predetermined width from one side edge 6e in the longitudinal direction, as shown in FIG. However, instead of this, it may be fixedly formed in a state where it is bent inward in the width direction of the napkin 1. .
In the sanitary napkin 1, the first fixing portion 6 a is bonded onto the top sheet 2 that covers the skin contact surface side of the absorbent body 4. It may be directly joined to the surface on the skin contact surface side. In addition, the folding fixing portions 7a1, 7a2, 7a1 ′, 7a2 ′ can be partially or entirely omitted. Further, only one of the inner folding part 71 and the outer folding part 72 can be provided.

  In addition, the absorbent article of the present invention may be an absorbent article other than a sanitary napkin, and may be, for example, an incontinence pad, a panty liner (downcome sheet), or the like.

It is a perspective view which shows the sanitary napkin which is one Embodiment of this invention. It is the X1-X1 sectional view taken on the line of the sanitary napkin shown in FIG. It is explanatory drawing for demonstrating a wing part formation base material. It is the X2-X2 sectional view taken on the line of the sanitary napkin shown in FIG. It is a schematic diagram which shows the side part cross section of the excretion part area | region in the use condition of the sanitary napkin shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorber 5 Absorbent main body 6, 6 'Elastic sheet 61, 62 Sheet | seat which comprises an elastic sheet 63 Elastic member which comprises an elastic sheet 6a 1st fixing | fixed part 6b 1st 2 fixed part 6c 3rd fixed part 6d non-fixed part 7, 7 'leak-proof wall 7a1, 7a2, 7a1', 7a2 'folding fixed part 71 inner folded part 72 outer folded part 8, 8' wing part 82 wing part forming base Material 9, 9 'Leak-proof groove A Excretion part area | region CL The centerline extended in the longitudinal direction of a sanitary napkin

Claims (5)

An absorbent main body having an absorbent body between the front sheet on the skin contact surface side, a back sheet on the non-skin contact surface side, and both sheets, and an elastic sheet on each of both sides in the longitudinal direction of the absorbent main body A vertically long absorbent article comprising a formed hollow loop-shaped leak-proof wall, and wing portions extending from the left and right sides of the absorbent main body,
The stretchable sheet includes a first fixing portion fixed to a skin contact surface side of the absorbent body in an excretion portion region, which is a region having the wing portion in the longitudinal direction of the absorbent article, and a non-absorbent body of the absorbent body. A second fixing portion fixed to the skin contact surface side, and a third fixing portion bonded to the wing portion forming base material on the outer side in the width direction of the absorbent article rather than the side edge in the longitudinal direction of the absorbent body. An absorbent article having a non-fixed portion that is not joined to another member between the second fixed portion and the third fixed portion.   The excretory part region has a pair of leak-proof grooves extending along the longitudinal direction of the absorbent article, and the second fixing part is located outside the leak-proof grooves in the width direction of the absorbent article. The absorbent article of Claim 1 currently formed in the direction.   The absorbent article according to claim 1, wherein the third fixing portion is formed on a fold line when the wing portion is folded along a side edge of a crotch portion of a shorts.   The absorbent article according to any one of claims 1 to 3, wherein the stretchable sheet has a length between the first fixing portion and the third fixing portion of 20 to 80 mm.   The absorbent article according to any one of claims 1 to 4, wherein the leakage prevention wall has a height from a wing part to a top part of 5 to 40 mm.

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