JP2008136739A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article capable of reducing the feeling of incompatibility during use and improving a front leakage prevention property by a bent front part by bending the front part before it is worn regardless of the presence/absence of pressurizing force at the front part. <P>SOLUTION: The absorbent article is provided with an absorbent main body 10 and a leakage prevention wall 5 disposed along the longitudinal direction on the outer side of the width direction; the absorbent main body 10 is sectioned into an excretion part facing part, a front part and a back part in the longitudinal direction, and a roughly U-shaped front groove 6 projected to the front side is provided on a skin abutting surface at the front part. The front groove 6 forms the widest part 62 of a wide interval in the width direction, and a pair of center grooves 71 are provided in the width direction extending along the longitudinal direction on the skin abutting surface side in the excretion part facing part. An extension/contraction area P to be extended and contracted along the longitudinal direction of the absorbent main body 10 is provided on the upper part of the leakage prevention wall 5, and the front end part P1 of the contraction area P is positioned at or behind the same longitudinal direction position as the front end part 61 of the front groove 6 and is positioned more at the front than the widest part 62 of the front groove 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  In the following Patent Document 1, linear embosses that gradually approach the longitudinal center line are provided in the front end region on the surface side of the sanitary napkin, gradually approaching the longitudinal center line on both sides across the longitudinal center line. A sanitary napkin is described. According to the sanitary napkin described in Patent Document 1, when a pressing force is applied from the lateral direction, the front end region (hereinafter referred to as “front portion”) is bent with the linear embossing as a valley fold line, and the front portion bent by the front portion is bent. Leakage can be prevented.

JP 2002-291806 A

  However, in the sanitary napkin described in Patent Document 1, the front portion is bent only by devising the position, shape, etc. of the linear emboss. Pressure is required and forward bending does not always occur. In addition, sanitary napkins that are once worn in contact with the body by underwear must be peeled off from the body against the pressing force against the body by the underwear, resulting in a sense of incongruity during use. Connected. Furthermore, only the valley fold line by the linear embossing cannot be said to have sufficient flexibility at the front part, and further, it cannot be said that the front leakage prevention property by the bent front part is sufficient.

  Therefore, an object of the present invention is to use an absorbent article that is capable of preventing front leakage by bending the front part, because the front part bends before mounting regardless of the presence or absence of pressing force in the front part. It is an object of the present invention to provide an absorbent article that can further improve the pre-leakage preventing property due to the bent front portion.

  The present invention relates to an absorbent main body having a top sheet, a back sheet, and an absorbent body interposed between both sheets, and a leak-proof wall disposed along the longitudinal direction on each outer side in the width direction of the absorbent main body. The absorbent main body has an excretory part facing part disposed opposite to the excretion part of the wearer when worn in the longitudinal direction, and a front part on the front side of the excretion part facing part. And a rear portion on the rear side of the excretory portion facing portion, and the skin contact surface in the front portion is provided with a substantially U-shaped front groove convex toward the front side. The front groove forms the widest part with a wide interval in the width direction, and a pair of central grooves in the width direction extending along the longitudinal direction is provided on the skin contact surface side in the excretory part facing part. An extension region extending and contracting along the longitudinal direction of the absorbent main body is provided at the upper portion of the leak-proof wall. The front end portion of the contraction region is located at the same longitudinal position as the front end portion of the front groove or rearward thereof, and is positioned forward of the widest portion of the front groove. The above-mentioned object is achieved by providing a property article.

  According to the absorbent article of the present invention, in the absorbent article that can prevent the front leak by bending the front part, because the front part bends before mounting regardless of the presence or absence of pressing force in the front part, There is little discomfort during use, and it is possible to further improve the pre-leakage prevention property by the bent front part.

Hereinafter, the absorbent article of this invention is demonstrated, referring drawings based on the sanitary napkin of 1st Embodiment which is one preferable embodiment.
The sanitary napkin 1 according to the first embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable or liquid-permeable back sheet 3, and both sheets 2 and 3, as shown in FIGS. 1 to 3. An absorbent main body 10 having an intervening liquid-retaining absorbent body 4 and leak-proof walls 5 and 5 disposed along the longitudinal direction on the outer sides in the width direction of the absorbent main body 10 are provided.

The absorptive main body 10 has, in its longitudinal direction, an excretion part facing part A that is disposed to face the excretion part of the wearer when worn, a front part B in front of the excretion part facing part, and the excretion part facing part. Is also divided into a rear portion C on the rear side.
In the sanitary napkin 1 having the wing portion 12 as in the present embodiment, the excretory portion facing portion A is a portion having the wing portions 12 on both sides of the absorbent main body 10. In addition, the excretory part facing part A can be determined by the following specific factors. That is, the change position (for example, the minimum width in FIG. 2) of the leak-proof groove on the skin contact surface of the absorbent main body 10 (the general term for the grooves on the skin contact surface of the absorbent main body 10 such as the front groove 6 and the central groove 71). And may be the position of the maximum width), the constricted position of the absorber 4, the center position in the longitudinal direction of the absorber 4 having the middle and high regions, etc., but the wing portion 12, the leak-proof groove, the absorber 4 Can be preferentially determined in the order of the constricted position and the center position of the absorber 4 having the middle-high region, and the longitudinal length is in the range of about 50 to 60 mm centering on the specific factor.
In the present embodiment, the boundary between the excretory part facing part A and the rear part C is located at a substantially central part in the longitudinal direction of the absorbent main body 10.

  The “longitudinal direction” and the “width direction” mean “the longitudinal direction of the absorbent article” and “the width direction of the absorbent article”, respectively, unless otherwise specified. The terms “upper surface” and “lower surface” mean “skin contact surface (side surface)” and “non-skin contact surface (side surface)”, respectively, unless otherwise specified.

  As shown in FIG. 3, the absorber 4 has a two-layer structure including an upper layer absorber 41 and a lower layer absorber 42. The upper layer absorber 41 is shorter in length and narrower than the lower layer absorber 42. Further, the upper layer absorbent body 41 is not joined to the lower layer absorbent body 42, and is located at the center portion in the longitudinal direction of the lower layer absorbent body 42 and at the center portion in the width direction. Therefore, the upper layer absorber 41 forms a so-called middle-high region.

As shown in FIG. 3, the top sheet 2 covers the entire area of the upper surface of the absorbent body 4, and further extends in the width direction from both side edges of the absorbent body 4 and is wound on the non-skin contact surface side of the absorbent body 4. ing. The back sheet 3 covers the lower surface of the absorber 4 and further extends outward in the width direction from both side edges of the absorber 4 to form a pair of side flaps 13. The pair of side flaps 13 further extend outward in the width direction at the excretory part facing part A of the absorbent main body 10 to form a pair of wings 12 and 12. The wing 12 is bent at the time of wearing, and is fixed to the outer surface of underwear such as shorts via an adhesive or the like.
Further, the top sheet 2 and the back sheet 3 respectively extend in the longitudinal direction from the front and rear ends of the absorber 4 and are joined to each other at the extended portions to form end seal portions 14 and 14.

As shown in FIGS. 1 and 2, a substantially U-shaped front groove 6 that is convex toward the front side is provided on the skin contact surface in the front portion B. On the skin contact surface side in the excretory part facing part A, a pair of central grooves 71 and 71 are provided in the width direction extending along the longitudinal direction. The skin contact surface in the rear part C is provided with a substantially U-shaped first rear groove 72 that protrudes toward the rear side.
The pair of rear end portions of the front groove 6 and the front end portions of the pair of central grooves 71, 71 are respectively connected, and the pair of front end portions of the pair of central grooves 71, 71 and the first rear groove 72 are connected to each other. Are connected to each other to form a closed circumferential groove Q.

The entire circumferential groove Q (the front groove 6, the central groove 71, the first rear groove 72) is formed by integrally compacting the topsheet 2 and the lower layer absorbent body 42 of the absorbent body 4; The absorber 41 is surrounded by the entire circumferential groove Q in plan view.
In other words, the circumferential groove Q (the front groove 6, the central groove 71, the first rear groove 72) joins the topsheet 2 and the lower layer absorber 42, but the topsheet 2 and the upper layer absorber 41 are joined together. Not joined. Further, in the plan view, the outer shape of the upper-layer absorber 41 and the outer shape of the entire circumferential groove Q are substantially the same. Therefore, the upper layer absorber 41 is enclosed in a closed space composed of the top sheet 2 and the lower layer absorber 42.

  As shown in FIG. 2, the shape of the upper-layer absorbent body 41 in plan view is substantially the same in width at the front part B and the excretory part facing part A, and gradually becomes narrower at the rear part C. ing. The circumferential groove Q also has an effect of making the wearer aware of the middle-high region in the absorbent main body 10, that is, the upper layer absorbent body 41 of the absorbent body 4.

  As shown in FIGS. 2 and 4, the front groove 6 has a shape that bulges outward in the width direction, and forms a widest portion 62 having a wide interval in the width direction. The widest portion 62 is a portion where the interval in the width direction is first maximized when the plan view shape of the front groove 6 is viewed from the front end portion 61 toward the rear side. That is, the interval in the width direction becomes narrower or constant from the widest portion 62 toward the rear side. A shape in which the interval in the width direction is constant will be described later with reference to FIG.

  Further, the central groove 71 is convexly curved inward in the width direction in FIG. 2, and a constricted portion 71A is formed in the middle. The constricted portion 71A is a portion where the interval in the width direction is first minimized when the planar view shape of the central groove 71 is viewed from the front end portion toward the rear side. From the constricted part 71A toward the rear side, the interval in the width direction becomes wider again and reaches the rear end part. When the central groove 71 has the constricted portion 71A, as shown in FIG. 1, the rear side of the widest portion 62 of the front groove 6 is not bent (deformed), and the shape of the absorber 4 is stabilized. It is preferable from the point of being easy. As shown in FIG. 4, the central groove 71 has a shape protruding outward in the width direction, but has a constricted portion 71 </ b> A, and thus has the same effect. The distinction between the front groove 6, the central groove 71, and the first rear groove 72 is preferably determined based on the groove shape change portion.

  The curved shape of the entire circumferential groove Q is approximately convex outward between the front end portion 61 and the widest portion 62 of the front groove 6 and between the widest portion 62 and the rear end portion of the central groove 71. Is convex toward the inside, and the first rear groove 72 is convex toward the outside.

A substantially U-shaped second rear groove 73 convex on the rear side is provided outside the first rear groove 72. The pair of front end portions of the second rear groove 73 are connected to the vicinity of the pair of front end portions of the first rear groove 72. Accordingly, the rear portion C includes the first rear groove 72 and the second rear groove 73. A double substantially U-shaped leak-proof groove is formed.
The second rear groove 73 joins the top sheet 2 to the lower layer absorbent body 42 adjacent to the pointed area of the upper layer absorbent body 41 on the rear part C side. By forming the second rear groove 73, the leak-proof property in the rear part C is improved, and the lower-layer absorber 42 and the top sheet 2 are prevented from being separated, thereby improving the liquid absorbency. Flexibility to fit the body shape occurs.

As the top sheet 2, the back sheet 3 and the absorbent body 4, various materials conventionally used in absorbent articles such as sanitary napkins can be used without particular limitation.
As the surface sheet 2, for example, liquid permeable sheets such as various nonwoven fabrics and perforated films subjected to a hydrophilic treatment can be used. As the back sheet 3, for example, a liquid-impermeable or water-repellent sheet such as a thermoplastic resin film or a laminate of the film and a nonwoven fabric can be used, and a water-permeable sheet can also be used. .
As the absorbent body 4, various materials conventionally used as absorbent bodies in absorbent articles such as sanitary napkins can be used without particular limitation, for example, a pile layer obtained by depositing pulp fibers, What consists of a nonwoven fabric which uses a pulp fiber as a raw material can be used.

  Next, the leakage barrier 5 will be described. As shown in FIGS. 1-3, a pair of leak-proof walls 5 and 5 are arrange | positioned along the longitudinal direction in the width direction outer side of the absorptive main body 10, respectively. The leak-proof wall 15 extends over the entire length of the absorbent main body 10.

  As shown in FIGS. 2 and 3, an expansion / contraction region P that extends and contracts along the longitudinal direction of the absorbent main body 10 is provided on the top of the leak-proof wall 5. More specifically, the leak-proof wall 5 includes a base wall portion 51 that stands up from the vicinity of the side surface 43 of the absorber 4 and a planar elastic stretchable portion 52 that is connected to the upper end portion 54 of the base wall portion 51. . That is, the cross-sectional shape of the leak-proof wall 5 is substantially T-shaped.

  The elastic stretchable portion 52 is provided with a leak-proof wall elastic member 9 (91, 92) along the longitudinal direction of the absorbent main body 10 to be given elastic stretchability, and a stretchable region P is formed. A plurality of leak-proof wall elastic members 9 are arranged apart from each other in the width direction. The leakproof wall elastic member 9 positioned inward in the width direction relative to the base wall portion 51 is referred to as an “inner elastic member 91”, and the leakproof wall elastic member 9 positioned outward in the width direction from the base wall portion 51 is referred to as “inner elastic member 91”. This is referred to as “outer elastic member 92”. The stretchable region P refers to a region in which stretchability is substantially expressed, and even in a region where the leak-proof wall elastic member 9 exists, for example, by applying heat seal or the like, In other words, the region in which stretchability is no longer expressed is not included.

  The leak-proof wall 5 is disposed along the side surface 43 of the absorber 4, and the upper surface (skin contact surface) of the elastic stretchable part 52 is substantially parallel to the upper surface (skin contact surface) of the absorber 4. is there. The elastic expansion / contraction part 52 comes into contact with the skin of the wearer at least in the excretion part facing part A at least.

  The elastic stretchable part 52 is connected to the upper end part 54 of the base wall part 51 in a T-shaped cross section. That is, the elastic stretchable part 52 includes an inwardly projecting part 52 </ b> A that projects inward in the width direction of the absorbent main body 10 from the upper end part 54 of the base wall part 51, and the absorbent main body 10 from the upper end part 54 of the base wall part 51. The outer projecting portion 52B projects outward in the width direction.

  The projecting widths of the two projecting parts 52A and 52B are different, and the ratio of the projecting width of the inner projecting part 52A to the projecting width of the outer projecting part 52B (the former: the latter) is preferably 3: 2 to 2. 5: 1. The inwardly extending portion 52A and the outwardly extending portion 52B each have four thread-like inner elastic members 91 and two outer elastic members 92 (only one is shown in FIG. 3). Are arranged at intervals. It is preferable that the leak-proof wall elastic member 9 is arranged at least in the excretion part facing part A and further extends to the front part B and / or the rear part C side.

The elastic expansion / contraction part 52 is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the front end seal part 14 at the front part B in the front part B, and the inside part side thereof is The front-side leakage barrier seal 15 is joined to the skin contact surface side of the top sheet 2 or the back sheet 3.
Similarly, in the rear part C, the elastic expansion / contraction part 52 is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the rear end seal part 14 in the rear part C, The inner side is joined to the skin contact surface side of the top sheet 2 or the back sheet 3 by the rear leakage barrier seal 15.

  The leak-proof wall 5 stands up in the excretory part facing part A and a part of the rear part C by the contraction force by the expansion / contraction region P (leakage-proof wall elastic member 9). On the other hand, in the leakage prevention wall 5, in the remaining part of the front part B and the rear part C, at least the inner side in the width direction of the elastic expansion / contraction part 52 (inwardly projecting part 52 </ b> A) By being bonded to the top sheet 2 or the back sheet 3 by the wall seal portion 15, the standing is inhibited and does not stand. Therefore, the sanitary napkin 1 is curved in a concave shape as a whole in the longitudinal direction due to the contraction of the elastic stretchable part 52.

  The leak-proof wall 5 in this embodiment is formed by fixing the leak-proof wall-forming sheet 53 to the absorbent main body 10 as shown in FIG. The leak-proof wall forming sheet 53 is a sheet having a constant width in the longitudinal direction, and is formed in a shape in which the upper end portion 54 of the base wall portion 51 and the elastic stretchable portion 52 are continuously provided in a T-shaped cross section. So that it is folded. Therefore, the leak-proof wall forming sheet 53 has two layers in the base wall portion 51 and the elastic stretchable portion 52. In addition, the width | variety of the sheet | seat 53 for leak-proof wall formation is the width | variety of the sheet | seat 53 for leak-proof wall formation of a single-piece | unit state, Comprising: It does not necessarily correspond with the width direction of an absorbent article.

  More specifically, in the excretory part facing part A, as shown in FIG. 3A, the lower end part 55 of the base wall part 51 (the end part opposite to the upper end part 54 on the elastic expansion / contraction part 52 side). Is wound around the non-skin contact surface side of the absorbent body 4. And the lower end part 55 wound by the non-skin contact surface side of the absorber 4 is the non-skin contact surface side of the surface sheet 2 wound by the non-skin contact surface side of the absorber 4, and the back surface sheet 3 Is fixed by a known joining means such as an adhesive. The fixing position in the width direction of the leakage preventing wall forming sheet 53 in the excretory part facing part A is near the lower end part 55 in the base wall part 51.

  In the rear portion C, as shown in FIG. 3C, a part of the leakage prevention wall forming sheet 53 is folded in a mountain fold so as to extend inward in the width direction to form a multilayer portion 58. is doing. In the multi-layered portion 58, the folded facing surfaces are joined by the facing surface joining portion 57 to maintain the folded form, suppress the height of the leak-proof wall 5, and the napkin and the body do not separate too much. I am doing so.

  From the viewpoint of satisfactorily raising the base wall portion 51 of the leak-proof wall 5, the facing surface bonding portion 57 is preferably provided at a position on the outer side in the width direction on the facing surface where the multilayer portion 58 is folded. . By providing the multilayer portion 58 on the leak-proof wall 5, the distance in the thickness direction from the upper end portion 54 of the base wall portion 51 to the back sheet 3 in the rear portion C is shorter than the thickness direction distance in the excretory portion facing portion A. It has become.

  The multilayer portion 58 is formed over a predetermined length in the longitudinal direction of the base wall portion 51. The length of the multilayer portion 58 is preferably 15 to 45%, more preferably 20 to 30%, of the entire length of the portion where the leak-proof wall 5 stands.

As the material constituting the leak-proof wall 5, materials conventionally used as the material constituting the leak-proof wall in absorbent articles such as sanitary napkins can be used without particular limitation.
The leak-proof wall elastic member 9 in the leak-proof wall 5 is not limited to the thread-like elastic member as long as it has elasticity, and may be a belt-like one. Further, the base wall portion 51 may also have elasticity like the elastic elastic portion 52.
Further, in the present embodiment, the base wall 51 and the elastic stretchable part 52 are integrally formed in the leak-proof wall 5, but the base wall 51 and the elastic stretchable part 52 are separately manufactured, Can also be formed.

  As shown in FIG. 4, the front end portion P <b> 1 of the contraction region P is located behind the front end portion 61 of the front groove 6 and is located forward of the widest portion 62 of the front groove 6. The distance L1 (the distance along the longitudinal direction of the absorbent main body 10) L1 between the front end portion P1 of the contraction region P and the front end portion 61 of the front groove 6 is preferably 0 to 40 mm, and more preferably 20 to 30 mm. The interval L2 between the front end portion P1 of the contraction region P and the widest portion 62 of the front groove 6 (interval along the longitudinal direction of the absorbent main body 10) is preferably 10 to 40 mm, and more preferably 20 to 30 mm. .

The substantially U-shaped front groove 6 valley-folds a line R (see FIGS. 1 and 4) that extends forward from the convex front end portion 61 of the front groove 6 due to the contraction force of the elastic member 9 of the leak-proof wall 5. As a line, it has the shape where the front part B bends. Variations in the plan view shape of the front groove 6 will be described later.
A portion between the pair of front end portions 61 and the widest portion 62 in the width direction of the front groove 6 is connected at the front end portion 61, and as shown in FIG. 5, the front end portion 61 and the widest portion of the front groove 6 are widest. The angle θ between the imaginary lines K and K connecting the portion 62 is preferably 30 to 100 °, and more preferably 60 to 90 °.

  As shown in FIG. 6, the vicinity of the front end portion 61 of the front groove 6 has a tapered shape that is convexly curved outward. “Near the front end portion 61 of the front groove 6” means a portion in the range of the length L3 (see FIG. 5) from the front end portion 61 of the front groove 6 along the longitudinal direction of the absorbent main body 10. The length 3 is, for example, 7 mm. Variations in the shape in plan view near the front end 61 of the front groove 6 will be described later.

  Note that the leakage barrier wall 5 in the front portion B is not formed with a multilayer portion 58 that is a portion that suppresses the height in the rear portion C. If the multilayer portion 58 is formed on the leak-proof wall 5 in the front portion B, the force for forming the bent shape of the front portion B is weakened. Therefore, it is preferable not to form the multilayer portion 58 on the leak-proof wall 5 in the front portion B.

  According to the sanitary napkin 1 of the present embodiment having the above configuration, the skin contact surface in the front portion B has the widest portion 62 that is convex toward the front and has a wide interval in the width direction. And the front end portion of the shrinkage region P of the leak-proof wall 5 is located rearward of the front end portion 61 of the front groove 6 and forward of the widest portion 62 of the front groove 6. is doing. Therefore, the front end portion 61 of the front groove 6 serves as a base point due to the contraction force of the contraction region P of the leak-proof wall 5, and as shown in FIG. The body bends inward. As a result, a sufficiently raised pocket is formed in the peripheral portion of the front groove 6, so that the front leakage prevention property is high.

  Further, as shown in FIGS. 1 and 4, the front groove 6 is bent at the front portion B with the line R extending from the front end portion 61 to the front side as a valley fold line due to the contraction force by the elastic member 9 of the leak-proof wall 5. Therefore, it is possible to achieve sufficient leakage prevention even with respect to the front leakage from the central portion in the width direction in the bent front portion B.

  Next, a sanitary napkin according to another embodiment of the present invention will be described. About the sanitary napkin of another embodiment, a different point from the sanitary napkin of 1st Embodiment is demonstrated, and description is abbreviate | omitted about the same point. For points that are not particularly described, the description of the sanitary napkin of the first embodiment is applied as appropriate. In the sanitary napkin of another embodiment, the same effect as the sanitary napkin of the first embodiment is exhibited.

  As shown in FIG. 7, the sanitary napkin according to the second embodiment is different from the first embodiment in the extending direction of the leak-proof wall 5 in plan view. Specifically, in the first embodiment, the leak-proof wall 5 extends parallel to the longitudinal direction of the absorbent main body 10 in a plan view, but in the second embodiment, a pair of leak-proof walls in the width direction. The wall 5 extends so that the interval gradually increases from the rear side to the front side with respect to the longitudinal direction of the absorbent main body 10 in plan view. In a plan view, the angle at which the leakproof wall 5 extends with respect to the longitudinal direction of the absorbent main body 10 is preferably 0 to 15 degrees, more preferably 5 to 10 degrees. Other configurations are the same as those of the first embodiment.

  According to the sanitary napkin of 2nd Embodiment, the effect similar to 1st Embodiment is show | played. Furthermore, since the extending direction of the pair of leak-proof walls 5 becomes substantially parallel after the forward part B is bent due to the extending direction of the leak-proof wall 5 before the front part B is bent, the leak-proof wall 5 is less likely to fall on the surface side of the absorbent body 4 and the space between the leak-proof wall 5 and the leak-proof groove in the excretion region is sufficiently obtained. The leakage effect works effectively.

  As shown in FIG. 8, the sanitary napkin of the third embodiment differs from the first embodiment in the direction in which the lower end portion 55 of the base wall portion 51 of the leak-proof wall 5 is wound. Specifically, the lower end portion 55 of the base wall portion 51 of the leak-proof wall 5 is bent toward the outer side in the width direction and joined to the side flap 13. Other configurations are the same as those of the first embodiment.

  The plan view shape of the front groove 6 is not limited to the shape shown in FIG. For example, as shown in FIG. 9, the interval in the width direction may be constant over a predetermined length on the rear side of the widest portion 62. In this case, since a parallel portion exists in the longitudinal direction between the widest portion 62 of the front groove 6 and the central groove 71, the front groove 6 is formed from the front end portion 61 to the widest portion 62. The influence of bending is mitigated by the parallel part.

The plan view shape in the vicinity of the front end portion 61 of the front groove 6 is not limited to the plan view shape shown in FIG. For example, the vicinity of the front end 61 of the front groove 6 may have a substantially arc shape as shown in FIG. 10 (a), and bends inwardly as shown in FIG. 10 (b). It may have a sharp pointed shape, and may have a pair of linear shapes connected at the front end 61 as shown in FIG.
Further, the vicinity of the front end 61 of the front groove 6 may have a pair of sinusoidal shapes connected by the front end 61 as shown in FIG.

  Of these shapes in the vicinity of the front end portion 61, an abbreviated line K (see FIG. 5) connecting the front end portion 61 and the widest portion 62 of the front groove 6 as shown in FIGS. 10 (c) and 10 (d). The parallel shape is preferable in that the bending line can be easily guided along the leakage preventing groove or by using a part of the leakage preventing groove, and the vicinity of the front end portion 61 as shown in FIG. A shape that fits between the lines K and K is preferable in that the front end portion 61 protrudes and the restriction of bending due to the leak-proof groove is eliminated.

The plan view shape of the front groove 6 is not limited to the plan view shape shown in FIG. For example, the front groove 6 shown in FIG. 11 (a) has a shape shown in FIG. 6 in the vicinity of the front end portion 61, and is curved to protrude outward from the front end portion 61 toward the rear side. The curvature increases along the way.
The front groove 6 shown in FIG. 11 (b) has a shape shown in FIG. 10 (b) in the vicinity of the front end 61, and is curved convexly inward from the front end 61 toward the rear side. It is convexly curved outward from the middle.
The front groove 6 shown in FIG. 11 (c) has a shape shown in FIG. 10 (c) in the vicinity of the front end portion 61, and is a straight line having a constant interval in the width direction from the middle, and protrudes outward from the middle. Is curved.

The front groove 6 shown in FIG. 11 (d) has a shape shown in FIG. 10 (a) in the vicinity of the front end 61, and is curved outwardly from the front end 61 toward the rear side. On the way, the curvature decreases, and further on the way, the curvature increases.
The front groove 6 shown in FIG. 11 (e) has a shape shown in FIG. 6 in the vicinity of the front end portion 61 as compared with the front groove 6 shown in FIG. Have.
The front groove 6 shown in FIG. 11 (f) has a shape shown in FIG. 10 (b) in the vicinity of the front end portion 61, and is curved outwardly from the middle toward the rear side. The curvature is large.

  The shape of these front grooves 6 is not a shape that protrudes outward larger than the imaginary line K (see FIG. 5) connecting the front end portion 61 and the widest portion 62, but a portion that fits inside the imaginary line K in the width direction. Since it has many, it is preferable at the point which becomes easy to form the bending shape of the front part B. FIG. Moreover, even if the multistage front groove 6 as shown in FIGS. 11C to 11F has a shape that protrudes outward, there are many contact points between the virtual line K and the leakage prevention groove. Therefore, it is preferable from the viewpoint that the degree of freedom of bending of the front portion B is improved.

The absorbent article of the present invention is not limited to the above embodiments, and can be variously modified without departing from the spirit of the present invention.
For example, the front end portion P1 of the contraction region P may be located at the same longitudinal position as the front end portion 61 of the front groove 6. The front groove 6 and the central groove 71 may not be connected, and the central groove 71 and the rear groove 72 may not be connected. The rear groove 72 may not be provided.
Further, when the forward groove 6 has a protruding shape as shown in FIG. 10B, the bent shape is easily formed, so that the front groove 6 is separated by about 2 to 5 mm at the center in the width direction. May be.

When the leak-proof wall 5 having a T-shaped cross section is employed, the overhanging width of each of the inward overhanging portion 52A and the outward overhanging portion 52B may be the same, and the outward overhanging portion 52B may be the inward overhanging portion. The overhang width may be larger than 52A.
The multilayer portion 58 of the leak-proof wall 5 may be formed by folding a part of the leak-proof wall forming sheet 53 into a mountain fold so as to extend outward in the width direction. The number of folds of the multilayer portion 58, the width of the multilayer portion 58, the position of the opposing surface bonding portion 57 on the opposing surface where the multilayer portion 58 is folded, and the like can be appropriately set.

  If the leak-proof wall 5 has the expansion-contraction area | region P, the cross-sectional shape does not need to be a substantially T shape. As such a cross-sectional shape, for example, the leak-proof wall 5 rises from the back sheet 3 and falls inward in the width direction so as to be positioned above the skin contact surface side of the absorber 4. Examples include a shape (not shown) that is folded outward in the width direction above the skin contact surface side and falls outward in the width direction to a position deviated from above the skin contact surface side of the absorbent body 4. Moreover, the shape (not shown) which the front-end | tip part of the leak-proof wall 5 was further folded inward in the width direction, and fell inward in the width direction so that it might be located above the skin contact surface side of the absorber 4. Can be mentioned.

In the absorber 4, the upper layer absorber 41 and the lower layer absorber 42 may be integrated by an adhesive or embossing means, or may be a flat shape having no medium-high structure.
Each structure mentioned above can be combined suitably.
The present invention can be applied to incontinence pads, panty liners, disposable diapers and the like in addition to sanitary napkins.

FIG. 1 is a perspective view showing a schematic form in a natural state of a sanitary napkin as a first embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing a state in which the sanitary napkin of the first embodiment is stretched. 3A is a schematic view of the XX cross section shown in FIG. 2, FIG. 3B is a partially enlarged view of FIG. 3A, and FIG. 3C is YY shown in FIG. It is a schematic diagram of a cross section. FIG. 4 is a plan view showing the positional relationship between the shrinkage area of the leak-proof wall and the front groove. FIG. 5 is a plan view showing angles between virtual lines connecting the front end portion of the front groove and the widest portion. FIG. 6 is a partially enlarged plan view showing the shape near the front end of the front groove. FIG. 7: is a top view (corresponding figure of FIG. 4) which shows the positional relationship of the shrinkage | contraction area | region of a leak-proof wall and a front groove | channel about the sanitary napkin as 2nd Embodiment of the absorbent article of this invention. FIG. 8 is a schematic view [corresponding to FIG. 3A] of a cross section of a sanitary napkin as a third embodiment of the absorbent article of the present invention. FIG. 9 is a plan view showing a front groove having another shape. FIG. 10A to FIG. 10D are plan views showing variations of the shape in the vicinity of the front end portion of the front groove. Fig.11 (a)-FIG.11 (f) are top views which show the variation of the shape of a front groove | channel.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 41 Upper layer absorber 42 Lower layer absorber 5 Leakproof wall 51 Base wall part 52 Elastic stretch part 6 Front groove 61 Front end part 62 Widest part 71 Central groove 71A Constricted part 72 (first) Rear groove 73 Second rear groove 9 Elastic member A Excretion part facing part B Front part C Rear part P Contraction area P1 Front end part Q Whole circumferential groove R Valley fold line

Claims (4)

Absorption comprising a topsheet, a backsheet, and an absorbent main body having an absorbent body interposed between the two sheets, and a leak-proof wall disposed along the longitudinal direction on each outer side in the width direction of the absorbent main body A sex product,
The absorptive main body has, in its longitudinal direction, an excretory part facing part disposed opposite to the excretion part of the wearer when worn, a front part on the front side of the excretion part facing part, and a rear side of the excretion part facing part. It is divided into the rear part of the side,
The skin contact surface in the front part is provided with a substantially U-shaped front groove convex toward the front side, and the front groove forms the widest part with a wide interval in the width direction,
On the skin contact surface side in the excretory part facing part, a pair of central grooves are provided in the width direction extending along the longitudinal direction,
In the upper part of the leak-proof wall, an expansion / contraction region that extends and contracts along the longitudinal direction of the absorbent main body is provided,
The absorptive article in which the front end part of the contraction field is located in the same longitudinal direction position as the front end part of the front groove, or behind it, and ahead of the widest part of the front groove.   The absorptivity according to claim 1, wherein the substantially U-shaped front groove has a shape in which the front portion bends with a line extending from the convex front end portion of the front groove to the front side as a valley fold line. Goods.   3. The absorption according to claim 1, wherein the vicinity of the front end portion of the front groove has a substantially arc shape, a tapered shape that curves convex toward the outside, or a pointed shape that curves convex toward the inside. Sex goods. The skin contact surface in the rear part is provided with a substantially U-shaped rear groove convex toward the rear side,
A pair of rear end portions of the front groove and a front end portion of the pair of central grooves are connected to each other, and a rear end portion of the pair of central grooves and a pair of front end portions of the rear groove are connected to each other. A closed circumferential groove is formed,
The absorber has a two-layer structure consisting of a lower layer absorber and an upper layer absorber that is shorter and narrower than the lower layer absorber, and the upper layer absorber has the entire circumference in a plan view. The absorbent article in any one of Claims 1-3 enclosed by the groove | channel.

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