JP2018061688A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which can improve adhesion to a skin of a wearer, and which can suppress generation of wrinkles and turning of a flap part.SOLUTION: An absorbent article 1 comprises on both side parts of a rear side part R arranged on a position closer to a back of a wearer, rear flap sections 10H. The rear side part R comprises plural slits R1 which are cut in a thickness direction of an absorber, and separated in a lateral direction, and has a deviation stop part 52 on a non-skin facing surface side of each rear flap section 10H. Positions of the deviation stop parts 52 in a vertical direction X are overlapped to the slits R1, the rear flap sections 10H have a pair of recess parts 53a forming a narrow part 53 on both side edge parts along a vertical direction X of the rear flap sections 10H, and the narrow part 53 is formed on a rear side of the deviation stop parts 52 in the vertical direction X.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  For absorbent articles for women such as sanitary napkins and panty liners, absorbent articles that are long in the longitudinal direction along the wearer's front-rear direction are used as so-called night napkins. It is known that such an absorbent article has a flap portion at a rear portion arranged near the back of the wearer in order to prevent leakage of excrement such as menstrual blood. Moreover, it deform | transforms along a wearer's body shape and it is desired to contact | adhere with a wearer's skin with sufficient fit property.

  For example, the absorbent article described in Patent Document 1 includes a hip flap portion that protrudes outward in the width direction from the outer edge in the width direction of the main body portion behind the central region including the center of the excretory opening contact region. The hip flap part includes a side adhesive part on the non-skin contact surface side, the hip flap part is located behind the first constriction part and the first constriction part, and is wider than the first constriction part. A first flap portion that protrudes outward in the direction and includes a portion where the width of the hip flap portion is maximum, a first flap portion that is positioned forward of the first constriction portion, and protrudes outward in the width direction from the first constriction portion. 2 side flap part, and a side adhesion part is arranged at the non-skin contact side side of the 1st flap part. According to Patent Literature 1, it is supposed that the fixed state of the hip flap portion when a force is applied from the outer side in the width direction of the central region toward the inner side is improved.

  Further, Patent Document 2 has a flap portion on each side portion of the main body portion where no absorber is interposed, and in the unfolded state, the width direction length between both side edges of the region corresponding to the width direction fold line position is: An absorbent article is described which is formed so as to be relatively smaller than the length in the width direction of the front and rear regions. According to Patent Document 2, when the absorbent article is folded to be individually packaged, it is greatly reduced that the flap portion at the folding line position in the width direction is wrinkled and wrinkles are formed. Even if unfolded, there are no creases or wrinkles left on the flap, and it can be worn without any discomfort.

  Further, the applicant previously has a central slit region formed by dispersing vertical slits in the central part of the excretory part facing part of the absorber, and a rear slit extending in the lateral direction at the rear part of the absorber. The absorbent article which has the back slit area | region formed by being intermittently arranged in the vertical direction was proposed (patent document 3). According to the absorbent article described in Patent Document 3, deep creases and twists are unlikely to occur, the fit is improved, and the wearing feeling is improved. In addition, the vertical direction is a direction corresponding to the front and rear direction of the wearer of the absorbent article, and the horizontal direction is a direction orthogonal to the vertical direction.

JP 2014-36832 A JP 2010-82061 A JP 2015-23999 A

  Absorbent articles that are long in the vertical direction, such as so-called night napkins, are required to adhere to the wearer's skin, but in addition, the longer the absorbent article is in the vertical direction, There is a problem that turning over tends to occur. Patent Documents 1, 2, and 3 do not describe a solution for improving the adhesion of the wearer to the skin and suppressing the occurrence of wrinkles and turning of the flap portion.

  The subject of this invention is related with providing the absorbent article which can suppress generation | occurrence | production of the wrinkles and turning of a flap part while improving the adhesiveness to a wearer's skin.

  The present invention has a longitudinal direction along the wearer's front-rear direction and a transverse direction perpendicular to the longitudinal direction, and has a top sheet, a back sheet, and an absorbent body disposed between both sheets, and the wearer's back An absorbent article having a rear flap portion on each side portion of the rear portion disposed closer to the rear portion, wherein the rear portion has a plurality of slits that are cut in the thickness direction of the absorber and spaced apart in the lateral direction. And has a slip prevention portion on the non-skin facing surface side of the rear flap portion, and the position of the slip stop portion overlaps the slit, and the rear flap portion is Provided is an absorbent article having a pair of recesses forming a constricted portion at both side edges along the longitudinal direction of the rear flap portion, and the constricted portion is formed rearward of the misalignment stopping portion in the longitudinal direction. To do

  ADVANTAGE OF THE INVENTION According to this invention, while improving the adhesiveness to a wearer's skin, the absorbent article which can suppress the generation | occurrence | production of the wrinkles and turning of a flap part is provided.

FIG. 1 is a plan view schematically showing a skin facing surface side (surface sheet side) of a sanitary napkin that is an embodiment of the absorbent article of the present invention. FIG. 2 is an enlarged schematic view showing the positional relationship between the constricted portion, the joint portion, and the groove in FIG. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line II of FIG. 4 is a cross-sectional view schematically showing a cross section taken along line II-II in FIG.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the preferable embodiment. 1 to 4 show a sanitary napkin 1 which is an embodiment of the absorbent article of the present invention. As shown in FIG. 1, the napkin 1 has a longitudinal direction X extending along the wearer's front-rear direction and extending from the wearer's abdominal side to the back side through the crotch part, and a lateral direction Y orthogonal thereto. From the intermediate part M, the intermediate part M including the excretory part facing part disposed opposite to the excretion part of the wearer when worn, the front part F arranged on the abdomen side of the wearer, that is, the front side from the intermediate part M, And a rear portion R disposed on the back side or rear side of the wearer. The middle part M is a part where a wearer's excretion part (such as a vaginal opening) is disposed opposite to the central part in the lateral direction Y.

  As shown in FIG. 1, the napkin 1 extends outward in the lateral direction Y from the absorbent main body 10 having a shape elongated in the vertical direction and both side portions along the vertical direction X of the intermediate part M in the absorbent main body 10. And a pair of wing portions 10W and 10W. When the absorbent article has a wing portion like the napkin 1, the intermediate portion M in the absorbent article of the present invention has a wing portion in the longitudinal direction (longitudinal direction, X direction in the figure) of the absorbent article. If the napkin 1 is taken as an example, it is a region sandwiched between the root along the vertical direction X of one wing portion 10W and the root along the vertical direction X of the other wing portion 10W. Moreover, the intermediate part M in the absorbent article which does not have a wing part is a transverse direction (width direction, Y direction in a figure) which occurs when an absorbent article is folded by the trifold individual packaging form. ) Means the area surrounded by the first fold line and the second fold line as counted from the front end in the longitudinal direction of the absorbent article. The “center fold line” indicated by the reference symbol CFL in FIG. 1 corresponds to the second fold line here.

  The napkin 1 includes a liquid-retaining absorbent body 4 and a surface sheet 2 disposed on the skin facing surface side of the absorbent body 4. More specifically, the absorbent main body 10 constituting the napkin 1 includes a top sheet 2 that forms a skin facing surface, a back sheet 3 that forms a non-skin facing surface, and an absorption interposed between both sheets 2 and 3. A body 4 is provided. The absorptive main body 10 is divided into three regions of a front part F, an intermediate part M, and a rear part R in order from the wearer's stomach side in the longitudinal direction X. The longitudinal direction X coincides with the longitudinal direction of the napkin 1 and the absorbent main body 10, and the lateral direction Y coincides with the width direction orthogonal to the longitudinal direction of the napkin 1 and the absorbent main body 10.

  In the present specification, the “skin facing surface” is a surface of the absorbent article or its constituent member (for example, the absorbent body 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relative to the wearer's skin. The side close to the skin, and the “non-skin facing surface” is directed toward the side opposite to the skin side when the absorbent article is worn, that is, the side relatively distant from the wearer's skin. It is the surface to be. In addition, "at the time of wearing" here means a state where a normal proper wearing position, that is, a correct wearing position of the absorbent article is maintained, and the absorbent article is in a state of being deviated from the wearing position. Is not included.

  As shown in FIGS. 3 and 4, the topsheet 2 covers the entire skin-facing surface of the absorbent body 4, and both side edges along the longitudinal direction X are both side edges along the longitudinal direction X of the absorbent body 4. It is in the same position. On the other hand, the back sheet 3 covers the entire area of the non-skin facing surface of the absorbent body 4 and further extends outward in the lateral direction Y from both side edges along the longitudinal direction X of the absorbent body 4 to be described later. In addition, a side flap portion 10S is formed. The back sheet 3 and the side sheet 5 are joined to each other by known joining means such as an adhesive, a heat seal, and an ultrasonic seal at the extended portions from both side edges along the longitudinal direction X of the absorber 4. Moreover, the surface sheet 2 and the back surface sheet 3 are joined to each other by a known joining means at the extending portions from both ends in the longitudinal direction X of the absorber 4. The top sheet 2, the back sheet 3, and the absorbent body 4 may be joined by an adhesive. As the top sheet 2 and the back sheet 3, various kinds of materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation. For example, as the surface sheet 2, a single layer or multilayer nonwoven fabric, an apertured film, or the like can be used. As the back sheet 3, a moisture-permeable resin film or the like can be used.

  As shown in FIG. 1, the side flap portion 10 </ b> S projects greatly outward in the lateral direction Y at the intermediate portion M, and thereby a pair of wings on both the left and right sides along the longitudinal direction X of the absorbent main body 10. The portions 10W and 10W are extended. The wing portion 10W has a substantially trapezoidal shape with a lower base (long side compared to the upper base) located on the absorbent main body 10 side in a plan view as shown in FIG. The wing part adhesion part (not shown) which fixes this wing part 10W to clothes, such as shorts, is formed. The wing portion 10W is used by being folded back to the non-skin facing surface, that is, the outer surface side of the crotch portion of clothes such as shorts.

  The napkin 1 of this embodiment has a back flap part in each side part of the back part R distribute | arranged near a wearer's back. As shown in FIG. 1, the side flap portion 10 </ b> S also protrudes outward in the lateral direction Y also in the rear portion R, and thus a pair of left and right sides along the longitudinal direction X of the absorbent main body 10 The rear flap portions 10H and 10H are extended. By providing the rear flap 10H, it is possible to prevent side leakage of excretory fluid such as menstrual blood.

  The rear flap portion 10H has a shift stopper 52 on the non-skin facing surface. In the present embodiment, the misalignment preventing portion 52 is an adhesive portion, and by this adhesive portion, the rear flap portion 10H is not folded back, but is spread out, that is, extended to the side of the absorbent main body 10, and the clothes Fixed to. That is, the rear flap portion 10H is fixed to the skin-facing surface, that is, the inner surface of the clothing, via the shift preventing portion 52 (rear adhesive portion) formed on the non-skin facing surface. The wing portion adhesive portion and the misalignment preventing portion 52 are covered with a release sheet (not shown) made of a film, nonwoven fabric, paper, or the like before use.

The rear part R of the present embodiment has a plurality of slits R <b> 1 that are cut in the thickness direction of the absorber 4 and spaced apart in the lateral direction. Hereinafter, the slit in the rear portion R is also referred to as a rear slit R1. With the plurality of rear slits R1, the rear portion R can be easily deformed along the wearer's buttocks, and the fitting property is improved. More specifically, the region 54 sandwiched between the plurality of rear slits R1 that are separated in the lateral direction Y is deformed so as to rise to the skin facing surface side, whereby the lateral central region of the rear part R is It can be adhered along the shape of the groove.
Further, in the rear portion R of the present embodiment, the shift preventing portion 52 overlaps with the plurality of rear slits R1 spaced in the horizontal direction in the vertical direction (see FIG. 1). More specifically, two rear slits R1 and R1 that are spaced apart in the horizontal direction are located in a region sandwiched by a straight line that connects the front end portions and the rear end portions of the pair of left and right misalignment stop portions 52, 52. Existing.
In general, a gap is likely to be formed between the wearer and the napkin at a portion where the radius of curvature from the wearer's crotch portion to the rear becomes small, and in this region, the gap between the wearer and the napkin is preferably along the buttocks. Therefore, there is a tendency that gaps are likely to occur. On the other hand, in the napkin 1 of this embodiment, since the position in the vertical direction X is overlapped with the misalignment stopper 52 and the rear slit R1, it is sandwiched between the plurality of rear slits R1 separated in the horizontal direction Y. When the region 54 is raised and deformed along the groove of the buttock, the lateral central region of the rear portion R is easily adhered to the groove of the buttock, and also between the skin and the napkin on the laterally outer side of the groove of the buttock. The generation of gaps is suppressed, and transmission leakage and liquid flow are less likely to occur. When the slip stopper 52 and the rear slit R1 overlap in the longitudinal direction X, the deflection of the napkin 1 on the laterally outer side of the groove of the buttocks can be further suppressed, and a large amount of menstrual blood is excreted However, since the napkin 1 is in close contact with the portion where the radius of curvature decreases from the wearer's crotch portion to the back side, the leakage of menstrual blood is less likely to occur.

  From the viewpoint of further improving the adhesion between the laterally outer side portion of the groove of the collar portion and the napkin, the shift preventing portion 52 is configured so that the position in the vertical direction is the whole of each of the two rear slits R1 and R1 that are separated in the horizontal direction. Or it is preferable that it overlaps with a part, and 20% or more and 100% or less, more preferably 50% or more and 100% or less of the longitudinal length of each of the two rear slits R1 and R1 may overlap. preferable. The two rear slits R1, R1 are preferably located on both sides of the longitudinal center line CL of the absorbent article extending in the longitudinal direction X.

From the viewpoint of further improving the adhesion between the laterally outer portion of the groove of the collar portion and the napkin, in the vertical direction X, the length P1 (see FIG. 1) of the portion where the shift stopper 52 and the rear slit R1 overlap is Preferably it is 5.0 mm or more, more preferably 7.5 mm or more, preferably 40 mm or less, more preferably 20 mm or less, and preferably 5.0 mm or more and 40 mm or less, more preferably 7.5 mm or more and 20 mm or less. It is.
Here, the length P1 of the portion where the misalignment stopping portion 52 and the rear slit R1 overlap is the length of the overlapping portion of each rear slit R1 having the portion overlapping with the misalignment stopping portion 52. When a plurality of rear slits R1 having different formation positions in the vertical direction are provided, the length P1 of the overlapping portion of at least one rear slit R1 is preferably within the above range, and the two spaced apart in the horizontal direction It is preferable that the length P1 of the overlapping portion for each of the rear slits R1 and R1 is in the above range.

From the same viewpoint as described above, the length P2 (see FIG. 1) of the shift preventing portion 52 in the longitudinal direction X is preferably 15 mm or more, more preferably 20 mm or more, and preferably 50 mm or less, more preferably 40 mm or less. It is preferably 15 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less.
Further, the length P3 (see FIG. 1) of the misalignment stopper 52 in the lateral direction Y is preferably 5 mm to 30 mm, more preferably 10 mm to 20 mm.

From the viewpoint of preventing the occurrence of kinking of the absorbent article and improving the adhesion between the laterally outer portion of the groove of the heel part and the rear part R, the rear end part of the absorbent article from the rear end part of the misalignment stopping part 52 The distance L2 (see FIG. 1) is preferably 10% or more, more preferably 15% or more, and preferably 35% or less, more preferably with respect to the total length of the absorbent article 1 in the longitudinal direction X. It is 30% or less, preferably 10% or more and 35% or less, more preferably 15% or more and 30% or less. In addition, the rear end part of the absorbent article in the longitudinal direction X is an end part located most rearward in the longitudinal direction X (front and rear) of the absorbent article (see FIG. 1).
The distance L2 from the rear end portion of the misalignment stop portion 52 to the rear end portion of the absorbent article is preferably 40 mm or more, more preferably 60 mm or more, and preferably 140 mm or less, more preferably 120 mm or less. Moreover, it is preferably 40 mm or more and 140 mm or less, more preferably 60 mm or more and 120 mm or less.

  In addition, when there are a plurality of rear slits R1, one or more rear slits R1 that overlap the misalignment stopper 52 in the vertical direction may be provided, but preferably two from the viewpoint of further improving the adhesion of the napkin 1 to the skin. More preferably, it is 4 or more, preferably 10 or less, more preferably 6 or less, preferably 2 or more and 10 or less, more preferably 4 or more and 6 or less.

  In the napkin 1 of this embodiment, as shown in FIG. 1, the rear slit R1 has a linear shape in plan view, but the shape of the rear slit R1 in plan view is not limited to this and may be a wavy line or the like. The rear slit R1 preferably extends in the longitudinal direction X. Further, the rear slit R1 may not be parallel to the vertical center line CL that bisects the napkin 1 or the absorber 4 in the horizontal direction Y and extends in the vertical direction X. In this case, the rear slit R1 and the vertical slit R1 The angle formed with the center line CL is preferably less than 45 degrees.

In the rear portion R of the present embodiment, the number of the rear slits R1 may be two or more, and the number of the rear slits R1 is not particularly limited, but is preferably four or more, more preferably six or more, and preferably eighteen. Hereinafter, it is more preferably 14 or less, preferably 4 or more and 18 or less, more preferably 6 or more and 14 or less.
In the present embodiment, the rear portion R has a plurality of rear slits R1 in the rear slit region RS. The plurality of rear slits R1 may have the same shape in plan view and the inclination angle with respect to the longitudinal center line CL, or may be different from each other. Further, a pattern in which two or more rear slits R1 having different positions in the horizontal direction Y exist is preferable to a pattern in which the plurality of rear slits R1 are arranged in a line in the vertical direction X.

In the napkin 1 of this embodiment, it is preferable to set the dimension of each part of back slit R1 as follows from a viewpoint of improving the adhesiveness with respect to a wearer's skin more.
The length in the longitudinal direction X of the rear slit R1 is preferably 10 mm or more, more preferably 15 mm, and preferably 35 mm or less, more preferably 25 mm or less.
The length or width in the lateral direction Y of the rear slit R1 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.0 mm or less, more preferably 0.8 mm or less.

  In this embodiment, back slit R1 may penetrate the laminated body of the absorbent sheet which comprises the absorber 4 (refer FIG. 4), and does not need to penetrate. Further, as shown in FIG. 4, the rear slit R <b> 1 is not formed in the top sheet 2 and the back sheet 3 disposed above and below the absorber 4, and is further between the top sheet 2 and the absorber 4. It is preferable that it is not formed in the intermediate sheet which consists of a nonwoven fabric which may be arranged.

  As shown in FIG. 1, the rear flap portion 10H of the present embodiment has a pair of concave portions 53a that form a constricted portion 53 at both side edges along the longitudinal direction X of the rear flap portion 10H. Absorbent articles that are long in the vertical direction have a problem that wrinkles are likely to occur in the rear flap portion 10H, and the rear flap portion 10H is easily turned up by the wrinkles. However, like the napkin 1 of the present embodiment, by providing the constricted portion 53 in the rear flap portion 10H, the constricted portion 53 functions as a flexible shaft, suppressing the occurrence of wrinkles in the rear flap portion 10H, and the rear flap. The turning of the part 10H can be suppressed.

In the present embodiment, the constricted portion 53 is formed behind the shift preventing portion 52 in the vertical direction X. In general, the longer the absorbent article is in the longitudinal direction X, the larger the area that is not fixed by the misalignment stopper 52, so that the back flap portion tends to be wrinkled or turned up. In particular, when the misalignment stopper 52 is disposed at a portion where the groove of the collar portion contacts in the vertical direction X, that is, at a position overlapping the rear slit R1, wrinkles and turning are likely to occur at the rear flap portion.
On the other hand, by forming the constricted portion 53 behind the misalignment preventing portion 52 as in the present embodiment, it is possible to effectively suppress the occurrence of wrinkles and turns in the rear flap portion 10H. Note that the constricted portion 53 is formed behind the shift preventing portion 52 in the longitudinal direction X. The inner end portion of the concave portion 53a forming the constricted portion 53 is more than the rear end portion of the shift preventing portion 52. Although it means that it is located rearward, it is preferable that the entire recess 53 is located rearward of the rear end portion of the misalignment stopper 52.

Further, from the viewpoint of more reliably exerting the effect of suppressing wrinkles and turning in the rear flap portion 10H, the distance L1 from the rear end portion of the shift stopper 52 in the vertical direction X to the constricted portion 53 is the shift in the vertical direction X. The distance L2 from the rear end portion of the stopper 52 to the rear end portion of the absorbent article is preferably 25% or more and 75% or less. Here, the distance L1 from the rear end portion of the misalignment portion 52 in the vertical direction X to the constricted portion 53 is the inside of the concave portion 53a that forms the constricted portion 53 from the rear end portion of the misalignment stop portion 52 in the vertical direction X. It is the length to the end. Further, the rear end portion of the misalignment stopping portion in the longitudinal direction X is an end portion positioned most rearward in the longitudinal direction X (front and rear) of the misalignment stopping portion 52 (see FIG. 1).
The ratio of the distance L1 from the rear end portion of the misalignment stopping portion 52 to the constricted portion 53 in the longitudinal direction X to the distance L2 from the rear end portion of the misalignment stopping portion 52 to the rear end portion of the absorbent article is more preferable. Is 30% or more, more preferably 40% or more, more preferably 70% or less, further preferably 60% or less, more preferably 30% or more and 60% or less, and further preferably 40% or more and 60%. % Or less.
The distance L1 from the rear end portion of the shift preventing portion 52 in the longitudinal direction X to the constricted portion 53 is preferably 25 mm or more, more preferably 35 mm or more, and preferably 65 mm or less, more preferably 55 mm or less, Moreover, it is preferably 25 mm or more and 65 mm or less, more preferably 35 mm or more and 55 mm or less.

  As shown in FIG. 1, the constricted portion 53 is formed by a concave portion 53a. Further, regarding the concave portion 53a, when a straight line connecting both ends of the concave portion 53a is a straight line L5 and a straight line passing through the inner end portion of the concave portion 53a and perpendicular to the straight line L5 is a straight line L6, the intersection between the straight line L5 and the straight line L6 Let d be the distance to the inner end of the recess 53 (see FIG. 2). This distance d corresponds to the length of the recess 53a. The distance d is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably 10 mm or less, more preferably from the viewpoint of further suppressing the occurrence of wrinkles and turning in the rear flap portion 10H. It is 5.0 mm or less, preferably 0.5 mm or more and 10 mm or less, more preferably 1.0 mm or more and 5.0 mm or less.

  In the present embodiment, the top sheet 2 has grooves 6 in which the top sheet 2 and the absorber 4 are recessed toward the back sheet 3 side on the skin facing surface. Further, as shown in FIG. 1, the groove 6 is disposed in the rear portion R, and as shown in FIG. 2, the groove 6 has a convex portion 61 that forms a convex curve toward the outside in the lateral direction. ing. With such a configuration, the stability of the napkin 1 against bending in the vertical and horizontal directions can be further improved. Thus, the surface sheet 2 has the groove | channel 6 in which the surface sheet 2 and the absorber 4 are dented toward the back surface sheet 3 side in the skin opposing surface, and the groove | channel 6 is flat in the back part R. In view, it is preferable to have a convex portion 61 that forms a convex curve outward in the lateral direction Y.

  Moreover, although the groove | channel 6 in this embodiment has said convex part 61, distance L3 (in the vertical direction X of the inward end part of the recessed part 53a which forms the constriction part and the top part of this convex part 61 ( 2) is preferably within 5.0 mm. The distance L3 in the vertical direction X between the top portion of the convex portion 61 and the inner end portion is the position in the vertical direction X of the inner end portion of the concave portion 53a forming the constricted portion 53 and the top portion of the convex portion 61 in the groove 6. The distance from the position in the vertical direction X. With such a configuration, the stability of the napkin 1 against bending in the vertical and horizontal directions can be further improved. Moreover, tension | tensile_strength can be provided toward the horizontal direction outward with respect to the absorber 4, and when wrinkles generate | occur | produce in the absorber 4, the transmission of wrinkles can be suppressed more. In addition, when the groove | channel 6 has two or more said convex parts 61, the distance L3 in the vertical direction X of the top part of the convex part 61 and the inner edge part of the recessed part 53a is the inner edge part of the recessed part 53a, and vertical. The distance from the top of the convex portion 61 that is closest in the direction X is used.

  From the viewpoint of more surely achieving the above effect, the distance L3 in the longitudinal direction X between the top of the convex portion 61 in the groove 6 and the inner end portion of the concave portion 53a is more preferably 4.0 mm or less, and still more preferably. It is 3.0 mm or less, and most preferably 0 mm.

  Further, an inner groove 7 is formed which is located in a region surrounded by the groove 6 and has a convex shape toward the rear end in the longitudinal direction X of the napkin 1. The grooves 6 and 7 are linear in a plan view. The term “linear” as used herein means that the shape of the groove, that is, the recessed portion is not limited to a straight line in a plan view but includes a curved line. The linear grooves 6 and 7 may be continuous lines or discontinuous lines such as broken lines. By the grooves 6 and 7, effects such as suppression of liquid diffusion in the planar direction of the absorbent body 4, particularly in the lateral direction Y, and prevention of twisting of the absorbent body 4 can be achieved. The grooves 6 and 7 can be formed in accordance with a conventional method by pressing with or without heat, or by embossing such as ultrasonic embossing. In the grooves 6 and 7, the topsheet 2 and the absorber 4 are integrated by heat fusion or the like, and the bottoms of the grooves 6 and 7 are higher in density than their peripheral parts.

  In the plan view as shown in FIG. 1, the groove 6 of the present embodiment has a closed annular shape that surrounds the middle and high portions 43 and the inner groove 7 described later, and is formed symmetrically with respect to the longitudinal center line CL. The groove 6 is continuous not only from the rear part R but also from the front part F to the rear part R through the intermediate part M.

  The inner groove 7 is formed symmetrically with respect to the longitudinal center line CL, behind the middle and high portions 43 described later, in the longitudinal direction X. Further, the inner groove 7 has a rearward convex portion at the rear end 70 in the vertical direction X, while the front end side in the vertical direction X, that is, the middle-high portion 43 side is open.

The napkin 1 of the present embodiment has a pair of side sheets 5 and 5 on both side portions in the vertical direction on the skin facing surface of the top sheet 2.
The side sheets 5 and 5 and the surface sheet are joined along the longitudinal direction by the joining portion 51. As for the side seat | sheet 5, the inner edge located in the inner side of the horizontal direction Y from the junction part 51 is a free end part. For example, the side seat 5 may be folded at the free end side and an elastic member extending in the longitudinal direction X may be disposed inside the folded portion. When the elastic member is arranged in this manner, a leak-proof cuff is formed in which the folded portion rises toward the wearer's skin due to the contraction force of the elastic member. When the leak-proof cuff is formed in this way, it is possible to prevent side leakage of excretion fluid such as menstrual blood excreted on the skin facing surface of the napkin 1.

  In the napkin 1 of the present embodiment, the side sheets 5 and 5 and the top sheet 2 are alternately formed with outwardly protruding portions 51a and inwardly protruding portions, as shown in FIGS. It is joined along the longitudinal direction by repeated wave-like joining portions 51 that are repeated. Further, the constricted portion 53 overlaps the convex portion 51 a facing in the outward direction of the joint portion 51 at a position in the vertical direction. Thereby, the stability with respect to the bending | flexion of the vertical and horizontal direction of the napkin 1 improves more, and also tension | tensile_strength can be provided toward the horizontal direction outward of the napkin 1 more. As shown in FIG. 2, the convex portion 51a facing outward of the joint portion 51 is a portion facing outward from a center line that bisects the joint portion 51 in the lateral direction. The constricted part 53 and the convex part 51a facing outward of the joint part 51 only have to overlap at least partially with the inner end part of the concave part 53a forming the constricted part 53 and the convex part 51a.

  From the viewpoint of more surely achieving the above effect, the distance L7 between the convex portion 51a facing outward of the joint portion 51 in the lateral direction Y and the inner end portion of the concave portion 53a of the constricted portion 53 is preferably 10 mm. Above, more preferably 20 mm or more, and preferably 50 mm or less, more preferably 40 mm or less, and preferably 10 mm or more and 50 mm or less, more preferably 20 mm or more and 40 mm or less. The distance L7 between the convex portion 51a and the inner end portion of the concave portion 53a means the shortest distance between the inner end portion of the concave portion 53a and the convex portion 51a in the lateral direction Y.

  The absorber 4 will be described. The absorber 4 contains a superabsorbent polymer and hydrophilic fibers. As the superabsorbent polymer, a particulate polymer is generally used, but a fibrous polymer may be used. When the particulate superabsorbent polymer is used, the shape thereof may be any of a spherical shape, a block shape, a bowl shape, and an amorphous shape. As the superabsorbent polymer, generally, a polymer or copolymer of acrylic acid or an alkali metal acrylate can be used. The hydrophilic fiber may be essentially a hydrophilic fiber, or may be a fiber obtained by hydrophobizing a hydrophobic fiber, but the former fiber is particularly preferable. Examples of the inherently hydrophilic fiber include natural fibers, cellulosic regenerated fibers, and semi-synthetic fibers. Preferred examples include pulp and rayon. In addition to wood pulp such as softwood kraft pulp and hardwood kraft pulp, pulp includes non-wood pulp such as cotton pulp and straw pulp, but is not particularly limited. Moreover, you may use the crosslinked cellulose fiber which bridge | crosslinked the molecule | numerator of the cellulose fiber and / or the molecule | numerator, and the bulky cellulose fiber obtained by carrying out the mercerization process of wood pulp.

  As shown in FIGS. 1, 3 and 4, the absorbent body 4 in the napkin 1 includes a central absorbent sheet 41 disposed to face the excretion part of the wearer when worn, a portion overlapping the central absorbent sheet 41 in plan view, and A main body absorbent sheet 42 having a portion extending outward from the peripheral edge of the central absorbent sheet 41 is a laminated structure of a plurality of sheets. Both the absorptive sheets 41 and 42 contain a hydrophilic fiber and a superabsorbent polymer.

  In the present invention, the term “absorbent sheet” means a sheet-like absorbent structure containing an absorbent material such as a superabsorbent polymer or hydrophilic fiber, and a stacked fiber formed by stacking an absorbent material. Differentiated. In general, the absorbent sheet is thinner and less rigid than the absorbent material stack, so the absorbent article provided with the absorbent sheet is thin and thin, flexible and comfortable to wear. Excellent, and it is also easy to handle by folding it compactly. From the viewpoint of more effectively utilizing the features of such an absorbent sheet, and obtaining an absorbent article having sufficient liquid diffusibility and liquid retention, and having a good wearing feeling, under the condition of no load per absorbent sheet The thickness is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, more preferably 1.5 mm or less. As the absorbent sheet, for example, those described in Japanese Patent No. 2963647 and Japanese Patent No. 2955223 can be used. Examples of preferable absorbent sheets include adhesive strength generated in wet superabsorbent polymers and binders such as adhesives and adhesive fibers added separately, and between constituent fibers and superabsorbent polymers. A sheet-like material is formed by bonding the gaps.

  As shown in FIG. 1, the central absorbent sheet 41 is arranged in the lateral direction of the napkin 1 or the absorbent main body 10 in the intermediate part M, or in the part close to the intermediate part M of each of the intermediate part M and the front part F and the rear part R. It is arranged at the center of Y. Further, as shown in FIG. 4, the central absorbent sheet 41 has a multilayer structure formed by folding the sheet 41. The folded multilayer structure of the central absorbent sheet 41 includes two sheets extending in the longitudinal direction X through a position where the sheet 41 having a substantially rectangular shape in plan view divides the sheet 41 into approximately three equal parts in the lateral direction Y. The sheet 41 is formed in a so-called three-fold state by being folded on the same surface side (skin-opposing surface side) at a fold line.

  Further, as shown in FIGS. 3 and 4, the main body absorbent sheet 42 also has a multilayer structure formed by folding the sheet 42. In the folded multilayer structure of the main body absorbent sheet 42, the sheet 42 having a substantially rectangular shape in plan view is folded on the same surface side (non-skin facing surface side) by two folding lines extending in the vertical direction X. And both end edges along the longitudinal direction X of the sheet 41 are formed by being overlapped at the center portion in the lateral direction Y, and the overlapping portion of the both end edges is a three-layer structure of the sheet 42, The portion other than the overlapping portion has a two-layer structure of the sheet 42. The folded multilayer structure of the main body absorbent sheet 42 forms the outer shape of the absorber 4.

  Thus, the absorber 4 in the napkin 1 according to the present embodiment has a configuration in which the folding structure of one central absorbent sheet 41 is included in the folding structure of one main body absorbent sheet 42. However, the central part in the lateral direction Y of the intermediate part M is thicker than the peripheral part and is raised on the skin facing surface side due to the folding structure of the central absorbent sheet 41 being arranged. The middle and high portions 43 are preferable. On the other hand, portions other than the middle and high portions 43 in the absorbent body 4 are configured to include the folding structure of the main body absorbent sheet 42 without the folding structure of the central absorbent sheet 41, and have a thickness that is larger than that of the middle and high portions 43. A small standard absorbing portion 44 is preferred.

  In the napkin 1 of the present embodiment, the middle-high portion 43 has a rectangular shape in plan view as shown in FIG. 1, and its longitudinal direction coincides with the longitudinal direction X, so that the middle portion of the intermediate portion M in the lateral direction Y It is arranged in. However, the plan view shape of the middle-high portion 43 can be arbitrarily selected and is not limited to a rectangular shape.

  As shown in FIG. 1, one central fold line CFL formed by folding the napkin 1 is formed in the rear portion R of the napkin 1 of the present embodiment. The center fold line CFL is formed by folding the napkin 1 in the vertical direction X with the top sheet 2 forming the skin facing surface facing inward (the back sheet 3 forming the non-skin facing surface facing outside). , A linear shape extending in the lateral direction Y. The center fold line CFL only needs to be formed in the center portion of the napkin 1 in the longitudinal direction X, and may be formed not in the rear portion R but in the intermediate portion M. The “center portion of the napkin 1 in the longitudinal direction X” here means the center of the napkin 1 in the longitudinal direction X and its vicinity, and specifically, the center of the napkin 1 in the longitudinal direction X is used as a reference. The region is within 10% of the total length of the napkin 1 in the longitudinal direction X on the front side and the rear side in the longitudinal direction X from the reference.

  In addition, one rear fold line RFL formed by folding the napkin 1 is formed in the rear portion R of the napkin 1 according to the present embodiment, behind the rear slit region RS, which will be described later, in the longitudinal direction X. Similarly to the center fold line CFL, the rear fold line RFL is formed by folding the napkin 1 in the vertical direction X with the surface sheet 2 forming the skin facing surface inside, and has a linear shape extending in the horizontal direction Y. There is no. The rear fold line RFL extends in the lateral direction Y between the groove 6 and the inner groove 7. Both the center fold line CFL and the back fold line RFL are used when the napkin 1 is folded and individually wrapped. The rear fold line RFL is usually formed at a position spaced 10 to 30% of the total length of the napkin 1 in the vertical direction X from the rear end of the napkin 1 in the vertical direction X to the front side in the vertical direction X. In the napkin 1 of the present embodiment, the rear fold line RFL and the constricted portion 53 do not overlap. With such a configuration, there is an effect that transmission of wrinkles starting from the rear fold line RFL can be suppressed.

In the napkin 1 of the present embodiment, the absorbent body 4 has a plurality of slits in the intermediate part M, as shown in FIG. Hereinafter, the slit in the intermediate portion M is also referred to as a central slit M1. A central slit region MS in which a plurality of central slits M1 extending in the vertical direction X are dispersedly arranged is provided. The central slit region MS exists in the middle-high portion 43.
In the napkin 1, the central slit M1 has a linear shape in plan view, but the planar shape of the central slit M1 is not limited to this, and may be a wavy line or the like. The central slit M1 only needs to extend in the vertical direction X, and does not have to be parallel to the vertical center line CL as illustrated. When the central slit M1 is not parallel to the vertical center line CL, it is preferable that the angle formed by the central slit M1 and the vertical center line CL is less than 45 degrees.

  The central slit region MS may have at least one central slit M1. The number of central slits M1 existing in the central slit region MS is not particularly limited. Further, when the central slit region MS has a plurality of central slits M1, the plurality of central slits M1 may have the same or different one or both of the shape in plan view and the inclination angle with respect to the longitudinal center line CL. May be.

The dimensions and the like of each part of the central slit M1 are preferably set as follows.
The length in the longitudinal direction X of the central slit M1 is preferably 10 mm or more, more preferably 15 mm, and preferably 35 mm or less, more preferably 25 mm or less. The length or width in the lateral direction Y of the central slit M1 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.0 mm or less, more preferably 0.8 mm or less.

  The central slit M <b> 1 may or may not penetrate the laminate of absorbent sheets that constitute the absorber 4. Further, the central slit M1 is not formed in the top sheet 2 and the back sheet 3 disposed above and below the absorbent body 4, and may be disposed between the top sheet 2 and the absorbent body 4. It is preferable that the intermediate sheet is not formed.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. For example, in the above-described embodiment, the absorbent body is composed only of the absorbent sheet, but may be composed only of the stacked body formed by stacking the absorbent material, and includes both. May be. Moreover, the multilayer structure of the absorbent sheet in the absorbent body may be formed by folding a single absorbent sheet as in the above embodiment, or a plurality of absorbent sheets may be stacked without being folded. The configuration may be the same, or may be a configuration in which both configurations are combined.

  The present invention can be applied to all articles used for absorption of menstrual blood. Examples of such articles include, but are not limited to, a panty liner and the like in addition to the sanitary napkin as in the above embodiment.

1 Sanitary napkin (absorbent article)
2 Top sheet 3 Back sheet 4 Absorber 41 Central absorbent sheet 42 Main body absorbent sheet 43 Middle-high part 44 Standard absorbent part 5 Side sheet 51 Joint part 51a Convex part 52 Slip-off part 53 Constricted part 6 Groove 61 Convex part 7 Inner groove DESCRIPTION OF SYMBOLS 10 Absorbent main body 10H Back flap part F Front part M Middle part R Back part CFL Center fold line RFL Back fold line M1 Center slit MS Center slit area | region R1 Back slit RS Back slit area | region CL Vertical center line X Vertical direction Y Horizontal direction

Claims (4)

It has a longitudinal direction along the wearer's front-rear direction and a transverse direction perpendicular to the longitudinal direction, and has a topsheet, a backsheet, and an absorbent body disposed between both sheets, and is arranged near the back of the wearer. An absorbent article having rear flap portions on both sides of the rear portion,
The rear portion has a plurality of slits that are cut in the thickness direction of the absorber and are spaced apart in the lateral direction, and has a misalignment prevention portion on the non-skin facing surface side in the rear flap portion,
The position of the shift stop portion in the vertical direction overlaps the slit,
The rear flap portion has a pair of concave portions that form a constricted portion at both side edges along the longitudinal direction of the rear flap portion,
In the longitudinal direction, the constricted portion is formed rearward of the misalignment preventing portion.   The distance from the rear end portion of the misalignment stopping portion to the constricted portion in the longitudinal direction is 25 to 75% with respect to the distance from the rear end portion to the rear end portion of the absorbent article. Absorbent article as described in 1. The surface sheet has a groove formed on the skin facing surface, the surface sheet and the absorber being recessed toward the back sheet side,
The groove has a convex portion that forms a convex curve toward the outside in the lateral direction in a plan view at the rear portion, and an inner side of the concave portion that forms the top portion of the convex portion and the constricted portion. The absorbent article of Claim 1 or 2 whose distance in the said vertical direction with an edge part is less than 5.0 mm. The absorbent article has a pair of side sheets on both sides in the longitudinal direction on the skin facing surface of the top sheet,
The side sheet and the top sheet are joined along the longitudinal direction by continuous wavy joints in which convex portions facing outward and convex portions facing inward are alternately repeated,
The absorptive article according to any one of claims 1 to 3, wherein the constricted portion has a position in the longitudinal direction overlapping a convex portion facing outward of the joint portion.

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