JP2017064039A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of suppressing discomfort which is generated on a crotch.SOLUTION: A napkin 1 comprises an absorber 2, a top sheet 3, and a back sheet 5, and comprises flap parts 6 on a center region 1a. The top sheet 3 comprises on both sides of a width direction, folding parts 31. The folding part 31 and the back sheet 5 are jointed on a first joint area 71. The width direction position of the first joint area 71 is between a folding end 31b of the folding part 31 and an outer end 20b of the absorber 2, and in a state of folding the flap part 6 in which the first joint part 71 serves as a folding original point, a width direction position of a folding end 61b of the folding part 61 being formed on the flap part 6 is disposed between the folding end 31b and the outer end 20b, and rigidity on the folding end 61b is larger than that on the folding end 31b, and smaller than that on the outer end 20b.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an absorbent article.

  Conventionally, sanitary napkins are known as absorbent articles. For example, Patent Document 1 discloses a liquid-permeable surface material that contacts a user's skin and allows permeation of body fluid such as menstrual blood, a leak-proof material that contacts a short and prevents leakage of body fluid, and a surface material. And a liquid-retaining absorbent that is interposed between the leak-proof materials.

  In this sanitary napkin, the surface material covers the skin contact surface side and the side surface side of the absorber, and on the non-skin contact surface side of the absorber, each of the absorber and the leakproof material via a fixing agent. And the surface material are fixed. Therefore, as for the absorber, the skin contact surface side and the side surface side are covered with the surface material, and the non-skin contact surface side is covered with the leak-proof material.

JP-A-7-184957

  When a sanitary napkin is worn, if a force is applied from the user's feet to the sanitary napkin from the outside in the width direction to the inside, both feet are repelled by the surface material covering the side of the absorber. Then, immediately after that, a repulsive force is received from the absorber having a higher rigidity (harder) than the surface material. Therefore, the repulsive force that both feet receive from the absorber cannot be sufficiently relaxed, and the user feels uncomfortable between the groins.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to absorb absorbent articles that can relieve the repulsive force that both feet receive and can suppress a sense of discomfort in the crotch. Is to provide.

  The main invention for achieving the above object is to provide a liquid absorber that has a longitudinal direction, a width direction, and a thickness direction and that absorbs liquid, and is disposed on the skin side of the absorbent body in the thickness direction. An absorbent article comprising: an absorbent sheet; and a liquid-impermeable sheet disposed on the non-skin side of the absorbent body in the thickness direction, wherein the liquid imbibing in the front region and the rear region in the longitudinal direction is provided. The permeable sheet has a flap portion protruding outward from the outer edge in the width direction in the central region in the longitudinal direction, and the liquid permeable sheet is a bent portion in which both sides in the width direction are bent toward the non-skin side. And the bent portion of the liquid permeable sheet and the liquid impermeable sheet are joined by a joining region along the longitudinal direction, and is located on the outermost side in the width direction among the joining regions. The width of the first joining region Is located between the bent end of the bent portion and the outer end of the absorbent body in the width direction, and the front end portion of the flap portion in the width direction is the liquid-insoluble portion with the first joining region as a starting point. The width direction of the folded end located on the outermost side in the width direction among the folded portions formed in the flap portion in a state where the flap portion is folded so as to contact the non-skin side surface of the permeable sheet Is positioned between the bent end of the liquid permeable sheet and the outer end of the absorber, and the rigidity at the folded end of the flap portion is the bent end of the liquid permeable sheet. The absorbent article is characterized in that it is larger than the rigidity of the absorbent body and smaller than the rigidity of the outer end of the absorbent body. Other features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

  According to the present invention, it is possible to relieve the repulsive force received by both feet and to suppress a sense of discomfort in the crotch.

It is the schematic plan view which looked at the napkin which concerns on embodiment of this invention from the skin side of the thickness direction. It is the schematic plan view which looked at the napkin from the non-skin side of the thickness direction. 3A is a schematic cross-sectional view taken along the line IIIA-IIIA in FIG. 1, and FIG. 3B is a diagram showing a state in which the flap portion is folded back in FIG. 3A. It is a schematic plan view which shows the positional relationship of a 1st joining area | region, a 2nd joining area | region, and a 3rd joining area | region. FIG. 5A is an explanatory view for explaining a method of measuring the magnitude of the repulsive force from the sample, and FIG. 5B is a measurement terminal for each of the bent end of the top sheet, the folded end of the flap portion, and the outer end of the absorber. It is the table | surface and graph which showed the maximum repulsive force when pushing in.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

  An absorbent body that has a longitudinal direction, a width direction, and a thickness direction and absorbs liquid; a liquid-permeable sheet disposed on the skin side of the absorbent body in the thickness direction; and the thickness of the absorbent body A liquid-impermeable sheet disposed on the non-skin side of the direction, than an outer edge in the width direction of the liquid-impermeable sheet in the front region and the rear region in the longitudinal direction. An outwardly extending flap portion is provided in the central region in the longitudinal direction, and the liquid-permeable sheet has a bent portion in which both sides in the width direction are bent on the non-skin side, and the liquid-permeable sheet has the bent portion. The bent portion and the liquid-impermeable sheet are joined by the joining region along the longitudinal direction, and the position in the width direction of the first joining region located on the outermost side in the width direction among the joining regions. Is the bent part of the bent part Between the end and the outer end of the absorbent body in the width direction, with the first joining region as a folding start point, the front end portion of the flap portion on the non-skin side of the liquid-impermeable sheet In the state where the flap portion is folded back so as to come into contact with the surface, the position in the width direction of the folded end located on the outermost side in the width direction among the folded portions formed in the flap portion is the liquid permeable sheet. Between the bent end of the absorbent body and the outer end of the absorber, and the rigidity at the folded end of the flap portion is greater than the rigidity at the bent end of the liquid-permeable sheet, and the absorption An absorbent article that is less than the stiffness at the outer end of the body becomes apparent.

  According to such an absorbent article, in the central region in the longitudinal direction where the frequency of contact between both feet is high, the bent end of the liquid-permeable sheet, the flap portion of the liquid-impermeable sheet, from the outer side to the inner side in the width direction. Since the folded end and the outer end of the absorbent body are arranged in this order, the repulsive force from the bent end of the liquid-permeable sheet and the flap part before both feet receive the repulsive force from the outer end of the absorbent body having the highest rigidity. By sequentially receiving the repulsive force from the folded end, the repulsive force from the outer end of the absorbent body received by both feet is relieved, and it is possible to suppress a sense of discomfort in the crotch (both feet).

  In this absorbent article, the bent portion of the liquid-permeable sheet and the liquid-impermeable sheet are joined by the first joining region in the front region and the rear region, and the central region Are joined by a second joining region along the longitudinal direction, and the second joining region has a total length along the longitudinal direction of the first joining region of the length along the longitudinal direction. It is desirable that the position of the outermost end in the width direction is shorter than the length and is located on the inner side of the position of the innermost end in the width direction of the first bonding region.

  According to such an absorbent article, since the length along the longitudinal direction of the second joining region is shorter than the total length along the longitudinal direction of the first joining region, the flap portion is folded back. In addition, the second joining region is unlikely to be the folding start point, and the extension along the longitudinal direction of the first joining region is the folding start point. Since the position of the outermost end in the width direction of the second bonding region is located inside the position of the innermost end in the width direction of the first bonding region, the second bonding region is the flap portion. Does not exist at the starting point. Thereby, when both feet hit the folded portion of the flap portion at the time of wearing, an uncomfortable feeling in the crotch (both feet) due to the adhesive or the like provided in the second joining region is suppressed. Furthermore, in the central region, as compared with the front region and the rear region, the width direction between the second joining region, which is a portion that joins the bent portion of the liquid-permeable sheet and the liquid-impermeable sheet, and the bent end of the bent portion. Therefore, the bent portion can be secured in a wider area. Thereby, the freedom degree of the fiber in a bending part increases and the touch becomes good, and the discomfort to the crotch at the time of wear is further suppressed.

  In such an absorbent article, it is desirable that the outermost end position in the width direction of the second joining region is located more inside than the outer end position of the absorbent body.

  According to such an absorbent article, since the 2nd junction field is located inside the position of the outer end of an absorber, both legs contact the outer end of an absorber before hitting the 2nd junction field. Therefore, both feet are less likely to hit the second joint region, and a sense of discomfort due to the adhesive or the like provided in the second joint region can be further suppressed.

  The absorbent article, wherein the skin-side surface faces the liquid-permeable sheet and is provided on the skin side of the liquid-impermeable sheet, and the liquid-permeable sheet is at least Bonded by a third bonding region provided between the skin-side surface of the facing member and the liquid-permeable sheet, and at least in the central region, the outermost side in the width direction of the third bonding region It is desirable that the position of the end of the liquid is located inside the position of the bent end of the liquid-permeable sheet.

  According to such an absorbent article, since the third bonding region is not provided up to the bent end of the liquid-permeable sheet in the width direction of the central region, the bent portion can be secured in a wider region. Thereby, the freedom degree of the fiber in a bending part increases and the touch becomes good, and the discomfort to the crotch (both legs) by the adhesive etc. which were provided in the 3rd junction area at the time of wear is controlled.

  In this absorbent article, at least in the central region, the position of the outermost end in the width direction of the third bonding region is inside the position of the innermost end in the width direction of the first bonding region. It is desirable to be located at.

  According to such an absorbent article, in the central region, the position of the outermost end in the width direction of the third joint region is located inside the position of the innermost end in the width direction of the first joint region. Therefore, the third joining region does not exist at the folding start point of the flap portion. Thereby, when both feet hit the folded portion of the flap portion at the time of wearing, an uncomfortable feeling in the crotch (both feet) due to an adhesive or the like provided in the third joint region is suppressed.

  In this absorbent article, the non-skin-side surface of the liquid-impermeable sheet is provided with a fixing region for fixing to a fixed member, and at least in the central region, the fixing region It is desirable that the position of the outermost end in the width direction is located inside the position of the innermost end in the width direction of the first bonding region.

  According to such an absorbent article, in the central region, the position of the outermost end in the width direction of the fixed region is located inside the position of the innermost end in the width direction of the first joint region. Therefore, the fixed region does not exist at the folding start point of the flap portion. Thereby, when both feet hit the folded portion of the flap portion at the time of wearing, discomfort to the crotch (both feet) due to the adhesive or the like provided in the fixing region is suppressed.

  In such an absorbent article, it is preferable that the position of the outermost end in the width direction of the fixed region is located inside the position of the outer end of the absorbent body at least in the central region.

  According to such an absorbent article, since the fixed region is located inside the position of the outer end of the absorbent body, both feet hit the outer end of the absorbent body before hitting the fixed region. Therefore, both feet are less likely to hit the fixed area, and a sense of incongruity due to an adhesive or the like provided in the fixed area can be further suppressed.

  In such an absorbent article, the flap portion is configured such that the front end portion in the width direction of the flap portion comes into contact with the non-skin-side surface of the liquid-impermeable sheet with the first joining region as a starting point. In the folded state, the number of members in the thickness direction at the position of the folded end of the flap portion is greater than the number of members in the thickness direction at the position of the bent end of the liquid-permeable sheet. It is desirable that the number of members in the thickness direction at the position of the outer end of the absorber is smaller than the number of members.

  According to such an absorbent article, the position of the bent end of the liquid permeable sheet, the position of the folded end of the flap portion, the position of the outer end of the absorber, that is, from the outside in the width direction. Since the number of members in the thickness direction increases toward the inside, the repulsive force that both feet receive during wearing gradually increases. Thereby, the repulsive force which both feet receive from an absorber is relieve | moderated, and it becomes possible to suppress the discomfort to a crotch (both feet).

=== Embodiment ===
A sanitary napkin 1 (hereinafter simply referred to as a napkin 1) will be described as an example of an absorbent article according to an embodiment of the present invention. Note that the absorbent article includes so-called vaginal sheets such as panty liners, light incontinence pads, and the like, and is not limited to sanitary napkins.

<Configuration of napkin 1>
The configuration of the napkin 1 will be described with reference to FIGS. 1, 2, 3A and 3B, and FIG.

  FIG. 1 is a schematic plan view of a napkin 1 according to an embodiment of the present invention as viewed from the skin side in the thickness direction. FIG. 2 is a schematic plan view of the napkin 1 viewed from the non-skin side in the thickness direction. 3A is a schematic cross-sectional view taken along the line IIIA-IIIA in FIG. 1, and FIG. 3B is a diagram showing a state in which the flap portion 6 is folded back in FIG. 3A. FIG. 4 is a schematic plan view showing the positional relationship between the first bonding region 71, the second bonding region 72, and the third bonding region 73.

  The napkin 1 is a sheet-like member that is vertically long in plan view, and has a longitudinal direction, a width direction, and a thickness direction. In the following description, “longitudinal direction” refers to the longitudinal direction of the product of the napkin 1, “thickness direction” refers to the direction of the thickness of the product of the napkin 1, and “width direction” refers to the longitudinal direction. A lateral direction orthogonal to the direction and the thickness direction is shown. In the longitudinal direction, the direction on the stomach side of the user when the napkin 1 is used is “front”, and the direction on the back side of the user is “back”. Further, the thickness direction has a “skin side” that is in contact with the user's skin when the napkin 1 is used, and a “non-skin side” that is the opposite side.

  The napkin 1 includes an absorbent body 2, a top sheet 3 disposed on the skin side in the thickness direction of the absorbent body 2, and a second sheet 4 disposed between the absorbent body 2 and the top sheet 3 in the thickness direction. The back sheet 5 is provided on the non-skin side of the absorbent body 2 in the thickness direction.

  The napkin 1 has the flap part 6 used in order to mount and fix to underwear etc. at the time of use in the center of a longitudinal direction. The flap portion 6 projects outward from the outer edge in the width direction at the front and rear of the napkin 1, and is provided on both sides in the width direction.

  Here, in the longitudinal direction of the napkin 1, a region where the flap portion 6 is provided is a central region 1a, a region in front of the central region 1a is a front region 1b, and a region behind the central region 1a is a rear region. 1c. The boundary between the central region 1a and the front region 1b and the boundary between the central region 1a and the rear region 1c will be specifically described with reference to FIG.

  In the flap part 6, let the point located in the outermost side of the width direction be the vertex 6a. When the inclination of the tangent to the outer edge of the napkin 1 is viewed in order from the vertex 6a to the front, a point where the inclination of the tangent is parallel to the longitudinal direction for the first time is defined as a front point 6b. In this case, a line connecting a pair of front points 6b arranged in the width direction is a boundary line (front boundary line) between the central region 1a and the front region 1b.

  Similarly, when the inclination of the tangent to the outer edge of the napkin 1 is viewed in order from the vertex 6a to the rear, the point at which the inclination of the tangent is parallel to the longitudinal direction for the first time is defined as a rear point 6c. In this case, a line connecting a pair of rear-side points 6c arranged in the width direction is a boundary line (rear-side boundary line) between the central region 1a and the rear region 1c.

  Therefore, in the napkin 1, the area from the front boundary line to the rear boundary line is the central area 1a. In FIG. 1, a tangent line at a pair of front points 6b and a tangent line at a pair of rear points 6c are indicated by two-dot chain lines, and a front boundary line and a rear boundary line are respectively indicated by one-dot chain lines.

  The absorber 2 is a member that absorbs liquid such as menstrual blood and holds it inside. Examples of the absorbent body 2 include those having an absorbent core formed of air laid pulp and the like and a cover sheet formed of hydrolytic paper, and those in which the absorbent core is wrapped with a tissue or the like. Moreover, the absorber 2 does not necessarily need to consist of a single structure, and may be formed by stacking a plurality of structures in the thickness direction.

  The top sheet 3 is an embodiment of a liquid-permeable sheet that allows liquid such as menstrual blood to pass through, and is formed of, for example, a nonwoven fabric. As shown in FIGS. 3A and 3B, the top sheet 3 has a bent portion 31 in which both sides in the width direction are bent. That is, the top sheet 3 is provided so that the absorber 2 and the second sheet 4 are wound inside from the skin side in the thickness direction. In the present embodiment, the distal end portion 310 of the bent portion 31 is located between the absorbent body 2 and the back sheet 5 in the thickness direction. However, the present invention is not limited thereto, and for example, the distal end portion 310 is more than the absorbent body 2. It may be located outside in the width direction.

  Like the top sheet 3, the second sheet 4 is a sheet that allows liquid such as menstrual blood to pass through, and is formed of, for example, a nonwoven fabric of synthetic fibers. In the present embodiment, the second sheet 4 is formed in the same size as the absorbent body 2, but is not necessarily the same size as the absorbent body 2. For example, the length in the width direction is the width direction of the absorbent body 2. It may be formed longer than this length. Note that the second sheet 4 is not necessarily provided in the napkin 1.

  The back sheet 5 is an embodiment of a liquid impermeable sheet. In the present embodiment, as shown in FIGS. 3A and 3B, the back sheet 5 is disposed on the most non-skin side in the thickness direction, and on the skin side in the thickness direction of the main sheet 51. There are two types of sheets, a pair of side sheets 52. Specifically, a part of the pair of side sheets 52 is disposed between the front end portion 310 of the bent portion 31 of the top sheet 3 and the main sheet 51 in the thickness direction.

  The main sheet 51 is formed of, for example, a liquid-impermeable synthetic film, and the side sheet 52 is formed of, for example, a soft nonwoven fabric. That is, in the present embodiment, the back sheet 5 may be such that the main sheet 51 is at least a liquid-impermeable sheet. Further, the back sheet 5 does not necessarily need to have two types of sheets, the main sheet 51 and the side sheet 52, and may be composed of only one type of liquid-impermeable sheet, for example.

  In the present embodiment, the back sheet 5 has a flap portion 6. Specifically, the main seat 51 and the pair of side seats 52 have a portion protruding outward from the outer edge in the width direction in the front region 1b and the rear region 1c in the central region 1a, and the flaps are formed by the protruding portions. Part 6 is formed. Note that the back sheet 5 does not necessarily have the flap portion 6, and the flap portion 6 may be formed of a sheet member different from the back sheet 5.

  A non-skin side surface 51b of the back sheet 5 (main sheet 51) is provided with a fixing region 511 for fixing the napkin 1 to a member to be fixed such as underwear, and the fixing region 511 is provided with an adhesive. ing. In the fixing region 511, the position of the outermost end 511 b in the width direction is located inside the position of the outer end 20 b in the width direction of the absorbent body 2.

  When the napkin 1 is worn, if a force is applied from the user's feet toward the inside in the width direction, the napkin 1 is crushed in the width direction between the crotch. At this time, both feet touch the fixing region 511 after hitting the outer end 20b in the width direction of the absorbent body 2 positioned outside the fixing region 511 in the width direction. This makes it difficult for both feet to come into contact with the fixed region 511, and can suppress a sense of incongruity caused by the adhesive provided in the fixed region 511 touching both feet.

  In the present embodiment, four band-shaped regions along the longitudinal direction are arranged in the width direction to form the fixed region 511, and therefore, 2 of the four band-shaped regions arranged on the outermost side in the width direction. The outermost end in the width direction in the two strip-shaped regions is the outermost end 511 b in the width direction of the fixed region 511.

  Further, a flap fixing region 512 for fixing the flap portion 6 to underwear or the like is provided on the non-skin side surface of the flap portion 6, and an adhesive is provided in the flap fixing region 512 in the same manner as the fixing region 511. Is provided. In the present embodiment, since the back sheet 5 has the flap portion 6, the flap fixing area 512 is also provided on the non-skin side surface 51 b of the back sheet 5 (main sheet 51), similarly to the fixing area 511. Yes.

  When the napkin 1 is used, the fixing area 511 is attached to the inside of the crotch part of the underwear, the pair of flap portions 6 are bent to the non-skin side, and the flap fixing area 512 is attached to the outside of the crotch part. 1 is fixed to the underwear.

  As shown in FIGS. 3A and 3B, the members constituting the napkin 1 are joined to each other in the thickness direction by a joining region 7 provided with an adhesive such as a hot melt adhesive. Examples of the adhesive application pattern provided in the bonding region 7 include an Ω pattern, a spiral pattern, and a stripe pattern. In addition, the joining method of each member does not necessarily need to be joining by an adhesive, and may be joined by, for example, pressure squeezing (embossing).

  Here, let the joining area | region 7 which joins the bending part 31 and the back sheet | seat 5 of the top sheet 3 be the 1st joining area | region 71 and the 2nd joining area | region 72. FIG. Specifically, as shown in FIG. 4, the bent portion 31 of the top sheet 3 and the back sheet 5 are joined by the first joining region 71 in the front region 1 b and the rear region 1 c and in the central region 1 a. Bonded by the second bonding region 72.

  The first bonding region 71 and the second bonding region 72 are band-shaped regions along the longitudinal direction. With respect to the first bonding region 71, in the present embodiment, a pair of front side first bonding regions 711 are provided side by side in the width direction in the front region 1b, and a pair of rear side first bonding regions 712 are in the width direction in the rear region 1c. It is provided side by side. In addition, a pair of back side 1st junction area | region 712 is located on the extension of the longitudinal direction of a pair of front side 1st junction area | region 711. FIG.

  In the present embodiment, for the second bonding region 72, a pair of second bonding regions 72 are provided side by side in the width direction in the central region 1a. The length along the longitudinal direction of the second joining region 72 is shorter than the total length of the lengths along the longitudinal direction of the first joining region 71. Specifically, the length L2 along the longitudinal direction of the second joining region 72 is along the length L1b along the longitudinal direction of the front side first joining region 711 and the longitudinal direction of the rear side first joining region 712. Is shorter than the total length of the length L1c (L2 <L1b + L1c). Thereby, when it is going to fold the flap part 6 toward the non-skin side, the 1st joining area | region 71 whose length along a longitudinal direction is longer than the 2nd joining area | region 72 tends to become a folding | turning origin.

  The first bonding region 71 is located outside the position in the width direction of the second bonding region 72 in the width direction. That is, the first joining region 71 is located on the outermost side in the width direction among the joining regions joining the bent portion 31 of the top sheet 3 and the back sheet 5 in the thickness direction.

  The first joining region 71 is located between the bent end 31 b of the bent portion 31 of the top sheet 3 and the outer end 20 b in the width direction of the absorbent body 2. Therefore, as shown in FIG. 3B, the front end portion 60 in the width direction of the flap portion 6 is brought into contact with the non-skin-side surface 51b of the back sheet 5 (main sheet 51) with the first joining region 71 as a starting point. In the folded state of the flap part 6, the position in the width direction of the folded end 61 b located on the outermost side in the width direction among the folded parts 61 formed in the flap part 6 is the folded end 31 b of the top sheet 3 and the absorber 2. It will be located between the outer ends 20b. That is, in the napkin 1, the folded end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outer end 20 b of the absorber 2 are positioned in this order from the outer side to the inner side in the width direction.

  More precisely, “using the first bonding region 71 as the folding start point” means that the outermost end 71 b in the width direction of the first bonding region 71 is the folding start point of the flap portion 6. Therefore, the fold line of the flap portion 6 is a line along the longitudinal direction at the position of the outermost end 71b in the width direction of the first joining region 71 (two-dot chain line in FIGS. 2 and 4). As shown, the position in the width direction of the folded end 61 b of the flap portion 6 and the position of the outermost end 71 b in the width direction of the first joining region 71 are the same.

  In the present embodiment, as shown in FIGS. 2 and 3A, the position of the innermost end 71a in the width direction of the first bonding region 71 is outside the position of the outermost end 511b in the width direction of the fixed region 511. Is located. In the present embodiment, the fixing region 511 is provided inside the position of the inner end 71a in the width direction of the first joining region 71 in the entire longitudinal direction of the napkin 1, but at least in the central region 1a, the width It is only necessary that the position of the innermost end 71 a in the direction is located outside the position of the outermost end 511 b in the width direction of the fixed region 511.

  As described above, since the position of the outermost end 511b in the width direction of the fixed region 511 is located inside the position of the innermost end 71a in the width direction of the first joining region 71, the napkin 1 is worn. At this time, when both feet hit the folded portion 61 of the flap portion 6, it is possible to suppress a sense of discomfort in the crotch (both feet) due to an adhesive or the like provided in the fixing region 511.

  Note that the position of the outermost end 511b in the width direction of the fixed region 511 is not necessarily located inside the position of the innermost end 71a in the width direction of the first bonding region 71 in the entire longitudinal direction of the napkin 1. For example, a part of the fixed region 511 may be positioned so as to overlap the first bonding region 71 in the width direction.

  In a state in which the flap portion 6 is folded, the rigidity at the folded end 61b of the flap portion 6 is larger than the rigidity at the bent end 31b of the top sheet 3 and smaller than the rigidity at the outer end 20b of the absorber 2. That is, in the napkin 1, the rigidity at the bent end 31 b of the top sheet 3, the rigidity at the folded end 61 b of the flap portion 6, and the rigidity at the outer end 20 b of the absorber 2 increase in order from the outside in the width direction to the inside. Yes.

  “Rigidity” refers to the strength with which each member resists breakage against bending or the like when a force is applied from the outside in the width direction to the inside in the width direction from both feet of the user. Say. Therefore, the magnitude relationship of the rigidity at each end is known by the magnitude relationship of the repulsive force received by both feet from the bent end 31b of the top sheet 3, the folded end 61b of the flap portion 6, and the outer end 20b of the absorber 2. be able to.

<Relationship between stiffness and repulsive force>
Next, with reference to FIGS. 5A and 5B, the relationship between the magnitude of the repulsive force received by both feet from the bent end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outer end 20 b of the absorber 2 will be described. I will explain.

  FIG. 5A is an explanatory diagram for explaining a method of measuring the magnitude of the repulsive force from the sample. FIG. 5B shows the bent end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outside of the absorber 2. It is the table | surface and graph which showed the value of the maximum repulsive force when the measurement terminal 8 was pressed with respect to each of the edge 20b.

  As shown in FIG. 5A, the measurement terminal 8 for measuring the magnitude of the repulsive force from the sample has a bifurcated tip portion along the thickness direction of the sample. The sample is obtained by cutting the napkin 1 in the thickness direction at the bent end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outer end 20 b of the absorber 2. Each sample is arranged between the two portions of the measurement terminal 8 and is opposed to the ends of the sample (the bent end 31b of the top sheet 3, the folded end 61b of the flap portion 6, and the outer end 20b of the absorber 2). And press the measuring terminal 8 from the width direction. At this time, the magnitude of the repulsive force received by the measurement terminal 8 from each sample is measured.

  As shown in the graph of FIG. 5B, the magnitude of the repulsive force increases in the order of the bent end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outer end 20 b of the absorber 2. In this graph, the average value of the maximum repulsive force for four times received by the measurement terminal 8 from each end is shown.

  More specifically, the average maximum repulsive force at the bent end 31b of the top sheet 3 is 0.07 [N], the average maximum repulsive force at the folded end 61b of the flap portion 6 is 0.20 [N], The average maximum repulsive force at the outer end 20b is 0.59 [N]. Therefore, the average maximum repulsive force at the folded end 61b of the flap portion 6 is about three times the average maximum repulsive force at the bent end 31b of the top sheet 3, and the average maximum repulsive force at the outer end 20b of the absorbent body 2 is the flap. The average maximum repulsive force at the folded end 61b of the portion 6 is about three times.

  From the above, since the greater the rigidity (harder) member, the greater the repulsive force, the rigidity increases in the order of the bent end 31 b of the top sheet 3, the folded end 61 b of the flap portion 6, and the outer end 20 b of the absorber 2. It can be said that.

  When the napkin 1 is worn, in the central region 1a where both feet are in high contact, when both feet apply a force toward the inside in the width direction, both feet are bent end 31b of the top sheet 3 having the least rigidity, and then A repulsive force is received in the order of the folded end 61b of the flap portion 6 having a small rigidity and the outer end 20b of the absorber 2 having the largest rigidity, and the repulsive force from the outer end 20b of the largest absorber 2 is relaxed, It is possible to suppress a sense of discomfort in the crotch (both legs).

  Furthermore, in this embodiment, in the state where the flap portion 6 is folded, the number of members in the thickness direction at the position of the folded end 61b of the flap portion 6 is the thickness direction at the position of the bent end 31b of the top sheet 3. And the number of members in the thickness direction at the position of the outer end 20b of the absorber 2 is smaller.

  Specifically, the number of members in the thickness direction at the position of the folded end 61b of the flap portion 6 is two top sheets 3, two side sheets 52, and two main sheets 51. , 6 points. The number of members in the thickness direction at the position of the bent end 31b of the top sheet 3 is two top sheets 3, which is two points. The number of members in the thickness direction at the position of the outer end 20b of the absorbent body 2 is two top sheets 3, second sheet 4, absorbent body 2, two side sheets 52, and two main sheets. It becomes the sheet | seat 51 and is 8 points | pieces.

  Therefore, the position of the bent end 31b of the top sheet, the position of the folded end 61b of the flap portion 6, and the position of the outer end 20b of the absorbent body 2, that is, in the thickness direction from the outside in the width direction of the napkin 1 to the inside. The number of members has increased.

  Since the bending end 31b of the top sheet, the folding end 61b of the flap portion 6, and the outer end 20b of the absorber 2 increase in rigidity in order, the number of members at each position also increases, so that both feet can be worn when the napkin 1 is worn. The magnitude of the repulsive force that is received increases more significantly. Thereby, the repulsive force which both legs receive from the outer end 20b of the absorber 2 can be relieve | moderated more.

  The napkin 1 does not necessarily need to have a greater number of members in the thickness direction as it goes inward from the outer side in the width direction. At least when the flap part 6 is folded back, the bent end 31b of the top sheet and the flap part 6 It is only necessary that the rigidity increases in the order of the folded end 61b and the outer end 20b of the absorber 2.

<Regarding the positional relationship of the second bonding region 72>
Next, the positional relationship of the second bonding region 72 will be described with reference to FIGS. 3A and 3B and FIG.

  In the present embodiment, the position of the outermost end 72 b in the width direction of the second bonding region 72 is positioned inside the position of the innermost end 71 a of the first bonding region 71 in the width direction. That is, since the second joining region 72 does not exist at the folding start point of the flap portion 6, when the napkin 1 is worn, a force is applied from the user's feet toward the inner side in the width direction so that both feet are the folded portion of the flap portion 6. In the case of hitting 61, it is possible to suppress a sense of incongruity due to an adhesive or the like provided in the second joining region 72.

  Also, as shown in FIG. 4, the distance between the second joining region 72 in the central region 1a and the bent end 31b of the top sheet 3 is the same as the distance between the first joining region 71 in the front region 1b and the rear region 1c. The distance between the bent end 31b of the top sheet 3 and the width direction is longer. Accordingly, the bent portion 31 of the top sheet 3 can be secured in a wider area, and the space S between the bent portion 31 and the absorbent body 2 is formed wider, so that the movement of the top sheet 3 in the bent portion 31 is performed. It becomes flexible and the discomfort to the crotch when the napkin 1 is worn is further suppressed.

  Furthermore, it is more desirable that the position of the outermost end 72b in the width direction of the second bonding region 72 is positioned inside the position of the outer end 20b of the absorbent body 2. Because, when the napkin 1 is worn, both feet of the user hit the outer end 20b of the absorbent body 2 before hitting the second joining region 72, so that the discomfort due to the adhesive or the like provided in the second joining region 72 is felt. It is because it can suppress more. In the napkin 1, the second bonding region 72 is not necessarily provided, and at least the first bonding region 71 that serves as a folding start point of the flap portion 6 may be provided.

<Regarding the third bonding region 73>
Next, in the case where the joining region 7 joining the top sheet 3 and the second sheet 4 is the third joining region 73, FIG. 3A, FIG. 3B, and FIG. The description will be given with reference.

  The top sheet 3 and the second sheet 4 are joined in the thickness direction by a third joining region 73 provided between the top sheet 3 and the skin-side surface 4 a of the second sheet 4. In the present embodiment, the second sheet 4 is an aspect of a facing member provided on the skin side with respect to the back sheet 5 with the skin side surface facing the top sheet 3. In addition, in the napkin 1, since the 2nd sheet | seat 4 does not necessarily need to be provided, when the 2nd sheet | seat 4 is not provided, the absorber 2 becomes an opposing member.

  In the present embodiment, the third bonding region 73 is provided in a region having the same size as the absorber 4 in plan view. Therefore, the position of the outermost end 73b in the width direction of the third bonding region 73 is the same as the position of the outer end 20b in the width direction of the absorber 2 in the central region 1a, the front region 1b, and the rear region 1c. .

  The position of the outermost end 73b in the width direction of the third bonding region 73 and the position of the outer end 20b in the width direction of the absorber 2 do not necessarily have to coincide with each other. The position of the outermost end 73 b may be located outside the position of the outer end 20 b in the width direction of the absorbent body 2. In other words, the third bonding region 73 may be provided so as to protrude from the absorber 2 in the width direction of the napkin 1.

  However, at least in the central region 1a, it is desirable that the position of the outermost end 73b in the width direction of the third joint region 73 is located inside the position of the bent end 31b of the top sheet 3. Thereby, in the width direction of the central region 1a, the third joining region 73 is not provided up to the bent end 31b of the top sheet 3, and the bent portion 31 of the top sheet 3 can be secured in a wider region, Since the space S between the bent portion 31 and the absorbent body 2 is formed wider, the degree of freedom of the fibers of the top sheet 3 in the bent portion 31 is increased, the flexibility is improved, and the crotch when the napkin 1 is worn A sense of discomfort is more suppressed.

  As in the present embodiment, at least in the central region 1a, the position of the outermost end 73b in the width direction of the third bonding region 73 is greater than the position of the innermost end 71a in the width direction of the first bonding region 71. It is more desirable that it is located inside. Because the third joining region 73 does not exist in the first joining region 71 which is the folding start point of the flap portion 6, when both feet hit the folded portion 61 of the flap portion 6 when the napkin 1 is worn, the third joining region 73 This is because it is possible to suppress discomfort in the crotch (both legs) due to the adhesive or the like provided in 73.

  As in the case of the second bonding region 72, the napkin 1 does not necessarily have the third bonding region 73 provided that at least the first bonding region 71 serving as a folding start point of the flap portion 6 is provided. Good.

=== Others ===
The above-described embodiments are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and it is needless to say that the present invention includes equivalents thereof.

1 ... Napkin (absorbent article)
1a ... Central region 1b ... Front region 1c ... Back region 2 ... Absorber 3 ... Top sheet (liquid permeable sheet)
4 ... Second sheet (opposing member)
4a ... Skin-side surface 5 (opposite member) Back sheet (liquid impermeable isomer sheet)
6 ... flap part 20b ... outer end 31 ... bent part 31b ... bent end 51b ... non-skin side surface 60 (of liquid impervious sheet) ... tip part 61 ... folded part 61b ... folded ends 71, 711, 712 ... first 1 junction region 71a ... innermost end 72 in the width direction of the first junction region ... second junction region 73 ... third junction region 73b ... the outermost end 511 in the width direction of the third junction region ... fixed region 511b ... fixed The outermost edge in the width direction of the region

Claims (8)

Having a longitudinal direction, a width direction, and a thickness direction;
An absorber that absorbs the liquid;
A liquid permeable sheet disposed on the skin side in the thickness direction of the absorber;
A liquid-impermeable sheet disposed on the non-skin side of the absorbent body in the thickness direction;
An absorbent article comprising:
In the central region in the longitudinal direction, there is a flap portion projecting outward from the outer edge in the width direction of the liquid-impermeable sheet in the front region and the rear region in the longitudinal direction,
The liquid-permeable sheet has a bent portion where both sides in the width direction are bent toward the non-skin side,
The bent portion of the liquid permeable sheet and the liquid impermeable sheet are joined by a joining region along the longitudinal direction,
The position in the width direction of the first bonding region located on the outermost side in the width direction among the bonding regions is between the bent end of the bent portion and the outer end in the width direction of the absorber,
In the state where the flap portion is folded so that the front end portion in the width direction of the flap portion is in contact with the non-skin-side surface of the liquid-impermeable sheet with the first joining region as a folding start point,
The position in the width direction of the folded end located on the outermost side in the width direction among the folded parts formed in the flap part is between the bent end of the liquid-permeable sheet and the outer end of the absorber. Located in the
The absorbent article characterized in that rigidity at the folded end of the flap portion is larger than rigidity at the bent end of the liquid-permeable sheet and smaller than rigidity at the outer end of the absorbent body. The absorbent article according to claim 1,
The bent portion of the liquid permeable sheet and the liquid impermeable sheet are joined by the first joining region in the front region and the rear region, and the first region along the longitudinal direction in the central region. It is joined by two joining areas,
The second joining region has a length along the longitudinal direction shorter than a total length of the first joining region along the longitudinal direction, and a position of an outermost end in the width direction is An absorbent article, wherein the absorbent article is located on the inner side of the innermost end in the width direction of the first joining region. The absorbent article according to claim 2,
The absorbent article, wherein the second joining region has an outermost end position in the width direction located inside an outer end position of the absorbent body. The absorbent article according to any one of claims 1 to 3,
The opposing member provided on the skin side with the skin-side surface facing the liquid-permeable sheet, and the liquid-permeable sheet is at least on the skin side of the opposing member Bonded by a third bonding region provided between the surface and the liquid-permeable sheet,
In at least the central region, the position of the outermost end in the width direction of the third joining region is located inside the position of the bent end of the liquid-permeable sheet. . The absorbent article according to claim 4,
At least in the central region, the position of the outermost end in the width direction of the third bonding region is located inside the position of the innermost end of the first bonding region in the width direction. Absorbent article. An absorbent article according to any one of claims 1 to 5,
The non-skin side surface of the liquid-impermeable sheet is provided with a fixing region for fixing to a fixed member,
At least in the central region, the position of the outermost end in the width direction of the fixed region is located inside the position of the innermost end in the width direction of the first joint region. Absorbent article. The absorbent article according to claim 6,
The absorbent article, wherein the position of the outermost end in the width direction of the fixed region is located inside the position of the outer end of the absorbent body at least in the central region. The absorbent article according to any one of claims 1 to 7,
In the state where the flap portion is folded so that the front end portion in the width direction of the flap portion is in contact with the non-skin-side surface of the liquid-impermeable sheet with the first joining region as a folding start point,
The number of members in the thickness direction at the position of the folded end of the flap portion is larger than the number of members in the thickness direction at the position of the bent end of the liquid permeable sheet, and the absorber. An absorbent article characterized by being less than the number of members in the thickness direction at the position of the outer end.

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