JP2017012281A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which looks more like an underwear.SOLUTION: An absorbent article having a lengthwise direction, a lateral direction, and a back and forth direction has: an absorbent body going along the lengthwise direction; and a sheet member which is provided with a belt part going along the lateral direction and a pair of leg gathering parts going along the lengthwise direction. A waistline opening and a pair of leg-line openings are formed. In the lengthwise direction, from the waistline opening side to the leg-line opening, a first overlapping area and a second overlapping area where at least the absorbent body and the sheet member inclined outside in the lateral direction overlap are provided for one side and the other side in the back and forth directions respectively. In the first overlapping area, at least the absorbent body and the sheet member are bonded in a first bonding part; in the second overlapping area, at least the absorbent body and the sheet member are bonded in a second bonding part. An end of the first bonding part is formed at the same position as an end of the first overlapping area.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  Conventionally, as an underpants-type disposable diaper, Patent Document 1 discloses an absorbent main body formed across an abdominal opening, a crotch part, and a back opening, and a pair of belts joined to the absorbent main body at a joint. A diaper having a portion is disclosed.

  Such a pants-type disposable diaper is required to look like underwear. At this time, if the joint portion between the absorbent main body and the belt portion is joined with an adhesive or the like, the joint portion becomes stiff and causes a sense of discomfort to the wearer. Therefore, an adhesive called a dry edge is applied. A region that is not provided is provided further ahead of the tip of the joint, thereby reducing the wearer's discomfort.

Special table hei 8-507699

  However, such a pants-type disposable diaper has a pair of joints formed in the conspicuous portions of the front and back sides of the abdomen, and compared to a normal diaper in which joints are formed at two locations on both sides. As a result, the number of locking portions increases. If a dry edge is provided at the joint portion, the joint portion becomes large, and the joint portion may be recognized in appearance even when clothes are worn.

  This invention is made | formed in view of the above conventional problems, The objective is to provide the absorbent article which looks more like underwear.

The main invention for achieving the above object is:
An absorbent article having a longitudinal direction, a transverse direction, and a front-rear direction, wherein the absorbent body along the longitudinal direction, a belt portion along the transverse direction, and a pair of leg gathers along the longitudinal direction A waistline opening and a pair of leghole openings, and in the longitudinal direction, from the waistline opening side toward the leghole opening, the lateral direction A first overlapping region and a second overlapping region that are inclined outward and at least the absorbent main body and the sheet member overlap each other are provided on one side and the other side in the front-rear direction, and in the first overlapping region, In addition, at least the absorbent main body and the sheet member are joined at the first joint portion, and at least the absorbent main body and the sheet member are at the second joint portion in the second overlapping region. Are bonded Te, the leading end of the first joint portion is absorbent article characterized in that it is formed in the same position as the distal end of the first overlapping region.
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, by forming the tip of the first joint and the tip of the first overlapping region at the same position, the first joint can be made smaller, and the impression of underwear of the absorbent article is impaired. Can be reduced.

It is a schematic perspective view showing the appearance of diaper 1. FIG. 2A is a plan view illustrating the diaper 1 in a state of being stretched along the longitudinal direction. 2B is a schematic cross-sectional view illustrating the AA cross-section of FIG. 2A. FIG. 3A is a plan development view illustrating a state in which the diaper 1 in a state of being stretched along the longitudinal direction is developed in the middle of the manufacturing process. FIG. 3B is a schematic cross-sectional view illustrating the BB cross section of FIG. 3A. FIG. 4 is a diagram for explaining an example of the manufacturing process of the diaper 1. FIG. 5 is a diagram for explaining a part b in FIG. FIG. 6 is a diagram for explaining a part a in FIG. FIG. 7 is a diagram illustrating the first joint WL1 of the diaper 1 in a state where the belt portion 30 is extended in the lateral direction. FIG. 8A is a schematic cross-sectional view illustrating the CC cross section of FIG. 7. FIG. 8B is a schematic cross-sectional portion illustrating the DD cross section of FIG. 7. FIG. 8C is a schematic cross-sectional view illustrating the EE cross section of FIG. 7. 8D is a schematic cross-sectional view illustrating the FF cross section of FIG. 7.

At least the following matters will become apparent from the description of the present specification and the accompanying drawings.
An absorbent article having a longitudinal direction, a transverse direction, and a front-rear direction, wherein the absorbent body along the longitudinal direction, a belt portion along the transverse direction, and a pair of leg gathers along the longitudinal direction A waistline opening and a pair of leghole openings, and in the longitudinal direction, from the waistline opening side toward the leghole opening, the lateral direction A first overlapping region and a second overlapping region that are inclined outward and at least the absorbent main body and the sheet member overlap each other are provided on one side and the other side in the front-rear direction, and in the first overlapping region, In addition, at least the absorbent main body and the sheet member are joined at the first joint portion, and at least the absorbent main body and the sheet member are at the second joint portion in the second overlapping region. Are bonded Te, the leading end of the first joint portion is absorbent article characterized in that it is formed in the same position as the distal end of the first overlapping region.

  According to such an absorbent article, the first joint portion can be made smaller by forming the tip of the first joint portion and the tip of the first overlapping region at the same position, which seems to be the underwear of the absorbent article. It can reduce that an impression is spoiled.

  In such an absorbent article, it is desirable that the tip of the second joint is formed at the same position as the tip of the second overlapping region.

  According to such an absorbent article, the tip of the second joint and the tip of the second overlapping region are formed at the same position, so that not only the first joint but also the second joint can be viewed. It can reduce that the impression like the underwear of an absorbent article is impaired.

  In such an absorbent article, it is desirable that the absorbent main body and the sheet member are respectively joined at a plurality of welding regions in the first joint portion and the second joint portion.

  According to such an absorbent article, the first main body and the sheet member are joined at the plurality of welding regions, so that the first and second parts can be compared with the case where the entire surfaces of the first joint and the second joint are welded. The two joint portions can be made inconspicuous, and the increase in rigidity of the first and second joint portions can be reduced.

  In such an absorbent article, a plurality of the welding regions in the first joint portion are arranged in parallel with the tip of the first overlapping region, and the first overlapping region is parallel to the tip of the second overlapping region. It is desirable that a plurality of the welding regions in two joint portions form a row, and that two or more rows are provided.

  According to such an absorbent article, by providing two or more rows in which a plurality of welding regions are arranged in parallel to the tips of the first and second overlapping regions, one row of welding of the first and second joint portions is provided. Even if the region is peeled off, the welded region in the other row is joined, so that the possibility that the absorbent article is completely peeled can be reduced.

  In this absorbent article, the sheet member includes a first elastic member and a second elastic member, and an end portion of the first elastic member includes a portion overlapping the welding region, The end portions of the two elastic members are preferably located between the adjacent welding regions.

  According to such an absorbent article, the end portion of the first elastic member of the sheet member has a portion that overlaps with the welding region, and the end portion of the second elastic member is provided between the adjacent welding regions, thereby being elastic. It is possible to prevent the influence such as the inhibition of welding by the member, and to improve the bonding strength of the first and second bonding portions.

  In such an absorbent article, the first elastic member and the second elastic member are thread rubber, and in the longitudinal direction, the interval between the adjacent weld regions in the first joint portion and the second joint portion. Is preferably smaller than the interval between the adjacent rubber threads.

  According to such an absorbent article, in the longitudinal direction, the bonding strength can be further improved by making the interval between adjacent welding regions in the first and second bondings smaller than the interval between adjacent rubber threads. .

  In this absorbent article, at the end of the first joint portion on the waistline opening side, the distance from the base end to the tip of the first joint portion is shorter toward the waistline opening side, and the second It is desirable that the distance from the base end to the distal end of the second joint portion at the end portion of the joint portion on the waistline opening side is shorter toward the waistline opening side.

  According to such an absorbent article, at the base ends of the first and second joint portions on the waist opening side, the distances from the base ends to the tips of the first and second joint portions are set to the waist opening side. By making it shorter, the first and second joints can be made inconspicuous. Moreover, it can prevent that the 1st and 2nd junction part hits a wearer's skin at the time of mounting | wearing, and can reduce a wearer's discomfort.

  In such an absorbent article, it is preferable that the lower end of the first joint and the lower end of the second joint are separated from the leg opening by a predetermined distance.

  According to such an absorbent article, the lower ends of the first and second joint portions are separated from the leg opening by a predetermined distance so that the lower ends of the first and second joint portions directly touch the wearer's skin. Can be prevented, and the wearer's discomfort can be reduced.

  In this absorbent article, it is preferable that the upper end portion of the belt portion is formed by folding the sheet member, and the leg gather portion includes an elastic sheet that can be expanded and contracted in the vertical direction. .

  According to such an absorbent article, since the upper end portion of the belt portion is formed by folding the sheet member and the leg gather portion includes the elastic sheet, the strength of the waistline opening and the suspension opening is improved. be able to. Moreover, in the absorbent article using thin materials, such as a nonwoven fabric, the color of a 1st and 2nd junction part will become darker than another part by joining a some member. However, the upper end portion of the belt portion is folded back of the sheet member, and the leg gather portion is provided with an elastic sheet, so that the colors of the first and second joint portions can be made inconspicuous.

  In such an absorbent article, the sheet member may have a region located on the other side of the absorbent main body in the first joint portion in a state where the belt portion is stretched in the lateral direction. desirable.

  According to such an absorbent article, in the 1st joined part, the sheet | seat member has the area | region located in the other side rather than an absorptive main body, and can provide the absorbent article with which a joined part is not conspicuous.

=== This Embodiment ===
A pants-type disposable diaper 1 (hereinafter also referred to as “diaper 1”) will be described as an example of the absorbent article according to the first embodiment.

  FIG. 1 is a schematic perspective view showing the appearance of the diaper 1. The diaper 1 has the absorptive main body 10, the leg gather part 20, and the belt part 30, and has a pants-type shape as shown in FIG. 1 when worn. The diaper 1 has a “longitudinal direction”, a “lateral direction”, and a “front-rear direction” which are orthogonal to each other in the pant-type state of FIG. And the waist part opening part HB is formed in the upper side of the vertical direction of the diaper 1, and a pair of leg periphery opening part HL is formed in the both sides of a horizontal direction. Moreover, the front side of the front-back direction of the diaper 1 is a part which covers a wearer's belly side at the time of wear, and the rear side of the front-back direction is a part which covers a wearer's back side.

  FIG. 2A is a plan view illustrating the diaper 1 in a state of being stretched along the longitudinal direction of the absorbent main body 10. 2B is a schematic cross-sectional view illustrating the AA cross-section of FIG. 2A. FIG. 3A is a plan development view illustrating a state in which the diaper 1 in a state of being stretched along the longitudinal direction of the absorbent main body 10 is developed during the manufacturing process. FIG. 3B is a schematic cross-sectional view illustrating the BB cross section of FIG. 3A. In addition, the XX line in FIG.1 and FIG.2 is a centerline in a horizontal direction.

  The diaper 1 is in a planar state as shown in FIG. 2A at the final stage of the manufacturing process. The manufacturing process of the diaper 1 will be described later with reference to FIG. The planar diaper 1 has a “longitudinal direction”, a “lateral direction”, and a “thickness direction” as three directions orthogonal to each other. The longitudinal direction of the diaper 1 in a planar state is a direction along the longitudinal direction of the absorbent main body 10. This longitudinal direction is a direction corresponding to the vertical direction in the pant-type state of FIG. 1, but strictly speaking, the vertical direction in the pant-type state and the vertical direction in the planar state are slightly different, so it is necessary. In such a case, “longitudinal direction in a pants-type state”, “longitudinal direction in a planar state”, and the like are distinguished from each other. In FIG. 2A, the state in which the diaper 1 is stretched along the longitudinal direction (that is, the planar state) is resistant to the contraction force by the thread rubber (leg gather elastic member) 23 and the belt elastic member (thread rubber) 33 described later. When the diaper 1 is extended in the longitudinal direction, it means a state where the diaper 1 is extended to such an extent that no wrinkles or gathers are substantially visible at the portion where each elastic member is disposed. Furthermore, the shape of the diaper 1 in the state of being stretched in the longitudinal direction is the same as the shape of the diaper 1 when the diaper 1 extends flat in the case where the contraction force by various elastic members such as the thread rubber 23 is not expressed. . The state in which the diaper 1 is stretched in the longitudinal direction is elastic so that the shape of the absorbent main body 10 matches the reference state when the shape when only the absorbent main body 10 is in the flat state is used as the reference state. It can also be said that the diaper 1 is stretched in the longitudinal direction against the contraction force by the member 33.

  Moreover, in the following description, in the state which extended the absorptive main body 10 to the longitudinal direction, let the side which hits a wearer's belly side be the front side (belly side) of a longitudinal direction, and let the side which hits a wearer's back side be a longitudinal direction. The rear side (back side). The lateral direction of the diaper 1 in a planar state is the same concept as the lateral direction and the thickness direction of the diaper 1 in the pant-type state in FIG. The thickness direction of the diaper 1 in a planar state is a direction orthogonal to the longitudinal direction and the lateral direction, respectively, and the side in contact with the wearer's skin is referred to as “skin side”, and the opposite side is referred to as “non- "Skin side".

  As shown in FIGS. 2A and 2B, in the diaper 1 in a flat state, the absorbent main body 10 is disposed along the longitudinal direction, and a pair of leg gathers 20 is provided on both sides of the absorbent main body 10 in the lateral direction. Is arranged. And a pair of belt part 30 is arrange | positioned so that a part of absorptive main body 10 and the leg gather part 20 may overlap with the skin side of a thickness direction. As shown in FIG. 3A, the diaper 1 is formed by a side seat 40 in which the leg gather portion 20 and the belt portion 30 are one sheet member. The leg gather portion 20 and the belt portion 30 are formed by folding the sheet member 40 inward in the lateral direction along a folding line FL extending in the longitudinal direction.

  The leg gather portion 20 is provided with a leg gather cutout portion 25 partially cut away at the laterally outer end portion 20eо (folding line FL). Similarly, the belt portion 30 is provided with a belt cutout portion 35 that is partially cut out at the laterally outer end portion 30eо (folding line FL). The leg gather cutout portion 25 and the belt cutout portion 35 form a leg opening HL.

  The belt portion 30 is composed of the absorbent main body 10 (strictly speaking, the absorbent main body 10 is defined by a pair of first joint portions WL1 inclined from the longitudinal front end 10ef of the absorbent main body 10 toward the leg opening HL. The top sheet 13) disposed on the skin side and the leg gathers 20 are joined. Similarly, the belt portion 30 includes the absorbent main body 10 and the leg gather portion 20 by a pair of second joint portions WL2 inclined from the longitudinal rear end portion 10er of the absorbent main body 10 toward the leg opening HL. It is joined. Details of the first joint and the second joint will be described later.

  The absorbent main body 10 is folded in the vicinity of the center position CL in the longitudinal direction while opening the diaper 1 in the flat state in the pair of belt portions 30 and 30 with the lateral inner end portions 30ei and 30ei being opened on both sides in the lateral direction. By this, it will be in the state which can be worn as the underpants type diaper 1. At this time, a waistline opening HB is formed by the longitudinal front end 10ef, the longitudinal rear end 10er of the absorbent main body 10, and the inner ends 30ei of the pair of belt portions 30 (see FIG. 1).

  As shown in FIG. 2A, the absorbent main body 10 has a substantially rectangular member (see FIG. 3A) extending in the longitudinal direction cut along the first joint portion WL <b> 1 and the second joint portion WL <b> 2. Each part is a sheet-like member that is tapered in a substantially V shape in plan view. The absorbent main body 10 includes an absorbent body 11, a top sheet 13 provided to cover the absorbent body 11 from the skin side (corresponding to a skin side sheet), and a back sheet provided to cover the absorbent body 11 from the non-skin side. 15 (corresponding to a non-skin side sheet). Each of these members 13, 11 and 15 is joined to a member adjacent in the thickness direction by a hot melt adhesive or the like (see FIGS. 2B and 3B). Examples of the adhesive application pattern include an Ω pattern, a spiral pattern, and a stripe pattern, and the same applies to other adhesives that appear later.

  The absorbent body 11 has an absorbent core in which a predetermined liquid absorbent material is formed into a predetermined shape (for example, a substantially hourglass shape in plan view), and a core wrap sheet that covers the outer peripheral surface of the absorbent core, It is a member that absorbs excreted fluid such as urine when the diaper 1 is worn. As a liquid absorptive material, liquid absorptive granular materials, such as liquid absorptive fibers, such as pulp fiber, and superabsorbent polymer (what is called SAP) can be illustrated. As the core wrap sheet, a liquid permeable sheet such as tissue paper or nonwoven fabric can be used. The shape of the absorbent body 11 is not limited to a substantially hourglass shape in plan view as shown in FIG. 3A, and may be another shape.

  The top sheet 13 is formed of a liquid permeable sheet such as an air-through nonwoven fabric, and its planar size is such that it protrudes from both the longitudinal side and the lateral side of the absorbent body 11. However, the top sheet 13 is not limited to this, and may be formed of a flexible sheet member having liquid absorbency.

  As shown in FIG. 3B, the back sheet 15 is formed by stacking and joining two sheet members, a leak-proof sheet 15f and an exterior sheet 15n, in the thickness direction. The leak-proof sheet 15 f is a liquid-impermeable sheet member made of a polyethylene (PE) film or a polypropylene (PP) film, and is disposed on the skin side in the thickness direction of the back sheet 15. The exterior sheet 15n is a sheet member made of a nonwoven fabric or the like, and is a member that is disposed on the non-skin side in the thickness direction of the back sheet 15 and constitutes the exterior of the absorbent main body 10. However, the back sheet 15 is not limited to the above-described configuration as long as it has a certain leak-proof property. The back sheet 15 is also a flat sheet that protrudes from both sides in the longitudinal direction and both sides in the lateral direction of the absorber. Then, the top sheet 13 and the back sheet 15 are joined to each other in the thickness direction so that the substantially V-shapes at both ends in the longitudinal direction are substantially aligned, whereby the absorber is interposed between the sheets 13 and 15. Is held.

  As shown in FIGS. 3A and 3B, the leg gather portion 20 is a sheet member that is long in the longitudinal direction joined to both lateral sides of the absorbent main body 10, and when forming the diaper 1 into a pants shape, Shrinks along the leg opening HL to form a bowl-shaped leg gather. The leg gather part 20 is formed by overlapping two sheets of a first sheet 21 and a second sheet 22 made of a nonwoven fabric or the like in the thickness direction. In addition, joining of the absorbent main body 10 and the leg gather portion 20 is hot in a state where the inner end portion in the lateral direction of the leg gather portion 20 is sandwiched between the top sheet 13 and the back sheet 15 of the absorbent main body 10. This is done by bonding with a melt adhesive or the like.

  As shown in FIGS. 3A and 3B, the belt portion 30 is a longitudinally long sheet member provided on both sides in the lateral direction of the leg gather portion 20, and when the diaper 1 is formed into a pants shape, A belt is formed (see FIG. 1). The belt part 30 is formed by overlapping two sheets of a first sheet 31 and a second sheet 32 made of nonwoven fabric or the like in the thickness direction.

  As described above, in the present embodiment, the leg gather portion 20 and the belt portion 30 are integrally formed by the sheet member 40 that is one member. That is, the first sheet 21 of the leg gather unit 20 and the first sheet 31 of the belt unit 30 are configured by the first sheet 41, and the second sheet 22 of the leg gather unit 20 and the second sheet 32 of the belt unit 30 are also second. The sheet member 42 is used. In the present embodiment, a portion of the sheet member 40 on the inner side in the lateral direction with respect to the folding line FL is the leg gather portion 20, and a portion on the lateral side of the folding line FL is the belt portion 30.

  A leg opening HL is formed so as to straddle the fold line FL. As described above, the leg opening HL includes the leg gather notch 25 obtained by notching the first sheet 21 and the second sheet 22 of the leg gather 20, and the first sheet 31 and the second sheet 32 of the belt 30. It is formed by the belt notch part 35 which notched.

  Further, a leg gather elastic member (thread rubber) 23 made of thread rubber or the like is disposed between the first sheet 21 and the second sheet 22 of the leg gather portion 20 in a state of extending in the longitudinal direction, and a hot melt adhesive It is fixed by etc. In FIG. 3A, two thread rubbers 23 are arranged at a position further inside than the laterally inner end of the leg gather notch 25 (that is, the laterally inner end of the leg opening HL). . By the rubber thread 23, the leg gather portion 20 is given stretchability in the longitudinal direction. Thereby, when forming the diaper 1 in a pants shape, the leg gather part 20 contracts along the leg opening HL, and a bowl-shaped leg gather is formed, thereby improving the fit of the wearer around the leg. be able to.

  Similarly, a belt elastic member (thread rubber) 33 made of thread rubber or the like is disposed between the first sheet 31 and the second sheet 32 of the belt portion 30 in the longitudinal direction, and hot melt adhesive or the like. It is fixed by. In FIG. 3A, a plurality of thread rubbers 33 are arranged side by side in a region further outward than the laterally outer end of the belt notch 35 (that is, the laterally outer end of the leg opening HL). Has been. The rubber thread 33 gives the belt portion 30 elasticity in the longitudinal direction. Thereby, when forming the diaper 1 in a pants shape, a contracting force along the waistline opening HB is developed over almost the entire area of the belt portion 30, and the displacement of the waistline when the diaper 1 is worn is suppressed. .

  Furthermore, it is preferable to provide an elastic sheet 43 formed of a stretchable nonwoven fabric or the like between the first sheet 41 (21, 31) and the second sheet member 42 (22, 32). The elastic sheet 43 is a belt-like elastic sheet member wider than the lateral width of the leg opening HL as shown by the hatched portion in FIG. 3A, and has an opening having the same shape as the leg opening HL. It is fixed to the sheets 41 and 42 with a hot melt adhesive or the like in a state of being stretched in the longitudinal direction. Thereby, the peripheral part of the leg periphery opening part HL is reinforced by the elastic sheet 43 over the perimeter (sand pattern part of FIG. 1). Further, the contraction force expressed by the planar elastic sheet 43 further improves the fit at the peripheral edge of the leg opening HL. If the elastic sheet 43 is not provided at the peripheral edge of the leg opening HL and only the thread rubber such as the thread rubber 23 is provided, a crease is formed between the thread rubber and the thread rubber. When the diaper 1 is worn, there is a risk that the leg opening HL may become loose or the rubber band mark may easily remain on the skin. On the other hand, fit property can be improved by arrange | positioning the planar elastic sheet 43 in the peripheral part of the leg periphery opening part HL. In addition, since the diaper 1 usually uses a light-colored material such as a nonwoven fabric, the color of the first joint portion WL1 to which a plurality of members are joined becomes dark. However, when the elastic sheet 43 is arranged, the number of members increases, and the first The color of the joint WL1 can be made inconspicuous.

  As an example of the elastic sheet 43, a so-called gear stretching process is performed on a nonwoven fabric having substantially elastic elastomer fibers such as polyurethane elastomer and thermoplastic resin fibers substantially inelastic such as polyolefin resin. Although the nonwoven fabric which expressed the elasticity can be illustrated, it is not restricted to this at all.

  Further, as shown in FIG. 3B, the laterally outer end region of the belt portion 30 is folded twice inward in the lateral direction at the first belt end folding line FLb1 and the second belt end folding line FLb2. It is preferable that the folded portion FLB is provided by fixing the folded portion with a hot melt adhesive or the like (FIG. 1). The second belt end folding line FLb2 is a portion that becomes the laterally inner end 30ei of the belt portion 30 and a portion that becomes the waist opening HB in FIG. 2A. By setting the waist opening HB to such an end folding structure, when the diaper 1 is worn, the stress around the wearer's waist can be reduced. Also, like the elastic sheet 43 of the leg opening HL, the waist opening HB can make the color of the first joint WL1 inconspicuous by the folded portion FLB in which a plurality of members are stacked, and the impression that seems to be underwear Can reduce the risk of damage. However, the said horizontal direction edge part area | region does not necessarily need to be made into the above folding structures.

<About production of diaper 1>
Then, the method to manufacture the diaper 1 is demonstrated easily. FIG. 4 is a diagram for explaining an example of the manufacturing process of the diaper 1.

  In this example, the diaper 1 is manufactured by performing predetermined processing (S101 to S105) on the base sheet while transporting the base sheet as a material in the transport direction. Hereinafter, the conveyance direction of the sheet member is referred to as “MD direction”, and the direction orthogonal to the MD direction is referred to as “CD direction”. The MD direction is a direction along the longitudinal direction (vertical direction) of FIG. 2A, and the CD direction is a direction along the lateral direction of FIG. 2A.

  The sheet | seat member used as the base material sheet of the diaper 1 in this embodiment is the absorbent main body continuous sheet 10A and the side continuous sheet 40A. The absorbent main body continuous sheet 10A is a sheet member in which a plurality of absorbent main bodies 10 are continuously arranged in the longitudinal direction (longitudinal direction). That is, the absorbent main body continuous sheet 10 </ b> A is a sheet member in which a plurality of absorbent bodies 11 are sandwiched between the continuous sheet of the top sheet 13 extending in the MD direction and the continuous sheet of the back sheet 15. Similarly, the side continuous sheet 40 </ b> A is a sheet member in which the sheet members 40 forming the leg gather portion 20 and the belt portion 30 are continuously arranged in the longitudinal direction (vertical direction).

  First, as shown in FIG. 4, the base sheet in which the side continuous sheet 40 </ b> A is bonded to both sides in the CD direction (lateral direction) of the absorbent main body continuous sheet 10 </ b> A is continuously conveyed in the MD direction (S <b> 101). .

  Subsequently, the leg gather cutout portion 25 and the belt cutout portion 35 serving as the leg opening HL at positions where the folding line FL is straddled on both sides of the absorbent body 11 in the CD direction (lateral direction) with respect to the conveyed base material sheet. Is formed (S102). The notch is formed using a cutter roll (not shown). 4 is a state corresponding to the diaper 1 in the unfolded state in FIG. 3A.

  Subsequently, a portion corresponding to the belt portion 30 of the side continuous sheet 40A is folded back inward in the CD direction (lateral direction) by a folding line FL, and a part of the absorbent main body 10 and the leg gather portion and the belt portion 30 are joined. The state is overlapped in the thickness direction (S103).

  Then, the 1st junction part WL1 and the 2nd junction part WL2 are formed by ultrasonic welding, and the belt part 30, the absorptive main body 10, and the leg gather part 20 are joined (S104).

Subsequently, the base sheet is cut (S105). Specifically, the diaper 1 is cut for each individual from the base sheet that continues in the MD direction, and further, the four corners of the rectangle are cut along the first joint WL1 and the second joint WL2. At this time, it is preferable to cut the top of the welding region WU (described later) to form the front end WLp1 of the first joint portion and the front end WLp2 of the second node body portion. By cutting the welded region WU, it is possible to reduce the possibility of peeling from the front end WLp1 of the first joint and the front end WLp2 of the second joint.
As a result, the diaper 1 in the planar state shown in FIG. 2A is formed.

<Regarding First Junction WL1 and Second Junction WL2>
Hereinafter, the first junction WL1 and the second junction WL2 will be described in more detail.
A pair of first joint portions WL1 are provided symmetrically with respect to the center line XX on the front side in the front-rear direction, and the second joint portions WL2 are symmetrical with respect to the center line XX on the rear side in the front-rear direction. A pair is provided. Since the first junction WL1 and the second junction WL2 have the same configuration in the front-rear direction, the first junction WL1 will be described below.

  As shown in FIG. 1, the first joint portion WL1 has a shape that is inclined from the longitudinal front end portion 10ef near the center in the lateral direction of the absorbent main body 10 toward the undercarriage opening HL. This is a part where the belt part 30 and the leg gather part 20 and the belt part 30 are joined. At this time, the front end WLp1 of the first joint located on the outermost side in the lateral direction among the first joints WL1 and the base end WLb1 of the first joint located on the innermost side in the lateral direction among the first joints WL1. Is substantially parallel.

  The length in the vertical direction of the first joint portion WL1 is the distance from the waistline opening HB to the lower end of the first joint portion WL1, and the length of the lateral end of the belt portion 30 is from the waistline opening HB. It is the length to the lower end of the belt portion lateral end portion 30es which is the outer end portion of the belt portion 30. At this time, the longitudinal length of the first joint portion WL1 is longer than the longitudinal length of the belt portion lateral end portion 30es. That is, in the vertical direction, the lower end of the first joint portion WL1 is formed below the lower end of the belt portion lateral end portion 30es. As a result, even if the belt portion 30 is stretched in the lateral direction by the rubber thread 33, a portion that does not expand or contract in the lateral direction is formed below the first joint portion WL1, so that the joint strength of the first joint portion WL1 is increased. Can be improved.

  Moreover, it is preferable that the lower end of the 1st junction part WL1 has left | separated only the predetermined distance from the leg periphery opening part HL. In the present embodiment, the leg gather portion 20 and the belt portion 30 are formed by one sheet member 40. At this time, when the lower end of the first joint portion WL1 is formed on the upper side separated by a predetermined distance (for example, about 2 to 10 mm) from the leg opening HL, the leg gather portion 20 and the belt portion 30 are connected to each other. Is formed. A laterally outer end 20eo in FIG. 2 is a portion where the leg gather portion 20 and the belt portion 30 in a state of being formed in the pants shape shown in FIG. 1 are connected. Thereby, it is possible to prevent the lower end of the relatively rigid first joint portion WL1 from directly touching the wearer's skin, and to reduce the uncomfortable feeling felt by the wearer. In addition, since the first joining member WL1 joining the leg gather portion 20 and the belt portion 30 is joined to the one sheet member 40, the joining strength is further improved and the joining portion is peeled off. Can be reduced.

FIG. 5 is a diagram for explaining a part b in FIG.
As shown in FIG. 5, a plurality of welding regions WU joined by ultrasonic joining are formed in the first joining part WL1. In this embodiment, ultrasonic bonding is used for bonding the first bonding portion WL1, but bonding may be performed using welding such as thermal welding or an adhesive such as hot melt.

  Since the diaper 1 is usually formed of a nonwoven fabric or the like, the diaper 1 has a feature that it is soft and feels good. However, if the welding region WU is formed in the entire region of the first joint portion WL1 without a gap, the first joint portion WL1 becomes hard. Therefore, in the present embodiment, by forming a plurality of triangular welded regions WU and providing a portion that is not joined to a portion that is joined within the region of the first joint portion WL1, the first joint portion WL1 is formed. Reduces becoming hard.

  At this time, a plurality of welding regions WU are sequentially arranged in parallel with the front end WLp1 (first overlapping region LA1 described later) of the first joint portion to form a row of the welding regions WU, and the row of the welding regions WU is defined as the first row. A plurality of rows are preferably provided in parallel to the tip WLp1 of the joint. In FIG. 5, the row aligned in the direction of arrow R1 is the row on the base end WLb1 side of the first junction, and the row aligned in the direction of arrow R2 is the row on the tip WLp1 side of the first junction. For example, even when an excessive force is applied to the first joint portion WL1 at the time of mounting or the like and the row R1 of the welding region WU on the base end WLb1 side of the first joint portion is peeled off, the distal end WLp1 of the first joint portion By maintaining the bonding in the row R2 of the welding region WU on the side, the possibility that the first bonding portion WL1 is completely peeled can be reduced.

  Furthermore, it is preferable to form a portion where the welding region WU and the thread rubber 33 overlap and a portion where it does not overlap at the tip WLp1 of the first joint portion. If the thread rubber 33 that overlaps the welding region WU is the first elastic member 33a and the thread rubber 33 that does not overlap the welding region WU is the second elastic member 33b, the first elastic member 33a of the tip WLp1 of the first joint portion is provided. Since the first elastic member 33a as well as the absorbent main body 10 and the sheet member 40 are overlapped with each other, if the ultrasonic bonding is performed from above, the bonding strength may be reduced by the first elastic member 33a. There is sex. However, by providing the second elastic member 33b that does not overlap with the welding region WU at the tip WLp1 of the first bonding portion, and providing the second elastic member 33b positioned between the adjacent welding regions WU, the first bonding portion WL1. It is possible to reduce the decrease in bonding strength.

  Moreover, it is preferable that the space | interval L33 of adjacent thread rubber is smaller than the space | interval Lwu of the adjacent welding area | region WU. At this time, the distance L33 between adjacent thread rubbers 33 is a distance from the center of the thread rubber 33 to the center of the adjacent thread rubber 33 (hereinafter also referred to as “pitch”), and the distance Lwu between the adjacent welding regions WU. Is the distance from the center of gravity of the welded area WU to the center of gravity of the adjacent welded area WU. The thread rubber 33 has an elastic force that pulls in the lateral direction at the portion where the thread rubber 33 is provided. In order to make the pitch of the welding regions WU smaller than the pitch on which the elastic force of the thread rubber 33 acts, The bonding strength of the first bonding portion WL1 can be further improved.

FIG. 6 is a diagram for explaining a part a in FIG.
Assuming that the distance from the base end WLb1 of the first joint portion to the tip end WLp1 of the first joint portion is L, it is preferable to shorten L as it is closer to the waistline opening HB. As shown in FIG. 6, L1 <L2 <L3 is established when the distance from the waistline opening HB is in the order of L1, L2, and L3. The first joint portion WL1 is formed by cutting from the front end WLp1 of the first joint portion above the first joint portion WL1 on the waistline opening HB side toward the base end WLb1 of the first joint portion. Thereby, the 1st junction part WL1 can be made not conspicuous, and the discomfort which the 1st junction part WL1 hits to a wearer's abdomen at the time of wearing can be reduced.

  FIG. 7 is a diagram illustrating the first joint WL1 of the diaper 1 in a state where the belt portion 30 is extended in the lateral direction. As shown in FIG. 7, the state in which the belt portion 30 of the diaper 1 is stretched in the lateral direction refers to a state in which the wearer has stretched the belt portion 30 in the lateral direction while wearing the diaper 1. Essentially, it means a state in which the thread rubber 30 of the belt portion 30 is stretched by 48 to 78% (preferably a state of 63% shrinkage) from the stretched state to the extent that no wrinkles or gathers can be seen in the lateral direction.

  8A is a schematic cross-sectional view showing the CC cross section of FIG. 7, FIG. 8B is a schematic cross-sectional portion showing the DD cross section of FIG. 7, and FIG. 8C is a schematic cross sectional view showing the EE cross section of FIG. 8D is a schematic cross-sectional view illustrating the FF cross section of FIG. 7. FIG. 8A is a cross-sectional view of a portion of the first joint portion WL1 where the absorbent main body 10 and the folded portion FLB of the belt portion 30 are joined, and shows an upper side from the first belt end folded line FLb1. FIG. 8B shows a portion of the first joint portion WL1 where the belt portion 30 below the folded portion FLB and the absorbent main body 10 are joined. 8 and 8D are portions where the leg gather portion 20 and the belt portion 30 are joined.

  As shown in FIGS. 8A, 8B, 8C, and 8D, a portion where the sheet member 40 (31, 32) constituting the belt portion 30 and the absorbent main body 10 overlap is the first overlapping region LA1. Then, a welding region WU is formed in the first overlapping region LA1 to form a first junction WL1. At this time, it is preferable to form the tip WLp1 of the first joint portion and the tip of the first overlapping region LA1 at the same position. Specifically, in the above-described manufacturing process S104, the first junction WL1 is formed in the first overlap region LA1, and the portion where the first overlap region LA1 and the first junction WL1 overlap is cut in S105. Thereby, the front-end | tip WLp1 of a 1st junction part and the front-end | tip of 1st overlap area | region LA1 can be formed in the same position.

  Thereby, the 1st junction part WLp1 can be made smaller and it can reduce that the impression like the underwear of the underpants type diaper 1 by which a junction part is provided in the front side of a stomach side is spoiled. The state in which the tip WLp1 of the first joint portion of the diaper 1 in the state where the belt portion 30 is extended in the lateral direction and the tip of the first overlapping region LA1 are formed at the same position is the normal pants-type diaper in FIG. 1 is also in a state where the tip WLp1 of the first joint and the tip of the first overlapping region LA1 are formed at the same position.

  Further, as shown in FIGS. 8A and 8B, the portion where the absorbent main body 10 and the belt portion 30 are joined in the first joint portion WL1 is located on one side in the front-rear direction, and the seat The member 40 is preferably located on the other side of the absorbent main body 10. That is, it is preferable that the first joint portion WL1 is inclined toward the belt portion 30 side, and the tip WLp1 of the first joint portion is located on the belt portion 30 side.

  As a result, the first joint portion WL1 having a relatively high rigidity reduces the unpleasant feeling that the wearer felt, such as crazing, or the first joint portion WL1 protruding from the clothes worn on the diaper can be seen. Etc., and the first joint WL1 can be made inconspicuous.

  At this time, the absorbent main body 10 does not include the elastic member along the lateral direction, and the belt portion 30 includes the belt elastic member 33 such as thread rubber (FIG. 7), so that the first joint tilted toward the belt portion 30 side. The part WL1 can be formed. Since a force pulling in the lateral direction (belt part 30 side) is applied to the first joint part WL1, the first joint part WL1 can be inclined to the belt part side, making the first joint part WL1 less noticeable.

  Assuming that the angle formed by the first joint WL1 and the adjacent sheet member 40 (31) is θ, the angle θ1 formed by the first joint WL1 and the adjacent sheet member 40 in the folded portion FLB in FIG. It is preferable that the degree is smaller. Similarly, it is preferable that the angle θ2 formed by the adjacent sheet member 40 and the first joining portion WL1 joining the belt portion 30 and the absorbent main body 10 below the folded portion FLB in FIG. 8B is smaller than 45 degrees. . Thereby, the 1st junction part WL1 can be made inconspicuous.

  Further, the angle θ3 formed between the first joint portion WL1 joining the leg gather portion 20 and the belt portion 30 in FIG. 8C and the adjacent sheet member 40, and the first joint portion joining the leg gather portion 20 and the belt portion 30 in FIG. 8D. It is preferable that an angle θ4 formed by one joining portion WL1 and an adjacent sheet member is larger than θ1 and θ2, respectively. In particular, it is more preferable that θ3 is 45 degrees or more and θ4 is 45 degrees or more.

  Further, as shown in FIG. 8C, a portion of the first joint portion WL <b> 1 where the thread rubber 23 along the longitudinal direction of the leg gather portion 20 and the thread rubber 33 along the lateral direction of the belt portion 30 intersect each other. In, θ3 is substantially vertical. In the present embodiment, this is due to the action of the thread rubber 23 having a longitudinal pulling force and the thread rubber 33 having a lateral pulling force.

  Furthermore, in the FF cross section in FIG. 7, the thread gathers 23 and 33 are not provided on the leg gather part 20 and the belt part 30 joined at the first joint part WL1, but the thread rubber of the leg gather part 20 is not provided. 23 is provided closer to the FF cross section than the thread rubber 33 of the belt part 30, the first joint WL1 is affected by the pulling force of the thread rubber 23, and θ4 has a larger angle than θ3. Become.

  In this way, by appropriately providing the thread rubber 23 not only in the rubber thread 33 of the belt part 30 but also in the leg gather part 20, the angle θ formed between the first joint part WL1 and the adjacent sheet member 40 can be changed. it can. Moreover, the wearer of the diaper 1 can visually recognize the 1st junction part WL1 visually by the difference in the inclination of the 1st junction part WL1, feeling the impression like underwear by the 1st junction part WL1 which is generally compact. This can reduce anxiety such as peeling of the joint. Moreover, it becomes easy to recognize the boundary between the leg gather part 20 and the belt part 30, and can be used as a guideline as a support part for lifting the diaper 1 when worn.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the welding region WU is formed in a triangular shape, but is not limited thereto. For example, the welding region WU may be formed in various shapes such as a circle and a square, and a plurality of bar-shaped welding regions parallel to the tip WLp1 of the first joint and the tip WLp2 of the second joint may be provided. Good.

  In the above embodiment, the first junction WL1 is formed on the front side and the second junction WL2 is formed on the rear side. However, the second junction WL2 is not necessarily formed on the rear side. Also good. By providing at least the first joint WL1 on the front side that is often noticeable, it is possible to give the wearer an impression of underwear. However, by providing the second bonding portion WL2 on the rear side, it is possible to give underwear to the rear side as well as the front side.

1 diapers (absorbent articles, disposable diapers),
10 Absorbent body, 10A Absorbent body continuous sheet,
10ef Longitudinal front end, 10er Longitudinal rear end,
11 Absorber, 13 Top sheet,
15 Back sheet, 15f Leak-proof sheet, 15n exterior sheet,
20 leg gathers, 20A leg gathers continuous sheet, 20eо lateral end,
21 1st sheet, 22 2nd sheet, 23 Leg gather elastic member (thread rubber),
25 Leg gather cutout,
30 belt part, 30es belt part side edge part, 30A belt continuous sheet,
30ei laterally inner end, 30eо laterally outer end,
31 1st sheet, 32 2nd sheet, 33 belt elastic member (thread rubber),
33a first elastic member, 33b second elastic member,
35 Belt notch,
40 sheet member, 40A side continuous sheet,
41 first sheet, 42 second sheet, 43 elastic sheet,
HB waistline opening, HL leg opening,
CL center position,
FL folding line, FLB folding part,
FLb1 first belt end folding line, FLb2 second belt end folding line,
Lwu interval, L33 interval,
LA1 first overlap region,
WL1 first junction, WL2 second junction,
WLp1 distal end of the first junction, WLb1 proximal end of the first junction,
WLp2 distal end of the second junction, WLb2 proximal end of the second junction,
WU welding area

Claims (10)

An absorbent article having a longitudinal direction, a lateral direction, and a front-rear direction,
An absorbent main body along the longitudinal direction;
A sheet member including a belt portion along the lateral direction and a pair of leg gather portions along the longitudinal direction;
A waist opening and a pair of leg openings are formed,
In the longitudinal direction, there are at least a first overlapping region and a second overlapping region that are inclined outward in the lateral direction from the waistline opening side toward the leg opening, and where the absorbent main body and the sheet member overlap each other. , Provided on one side and the other side of the front-rear direction,
In the first overlapping region, at least the absorbent main body and the sheet member are joined at a first joint portion,
In the second overlapping region, at least the absorbent main body and the sheet member are joined at a second joining portion,
The absorbent article, wherein a tip of the first joint is formed at the same position as a tip of the first overlapping region. The absorbent article according to claim 1,
The absorbent article, wherein a tip of the second joint is formed at the same position as a tip of the second overlapping region. In the absorptive article according to claim 1 or 2,
In the first joint portion and the second joint portion, the absorbent main body and the sheet member are respectively joined at a plurality of welding regions. The absorbent article according to claim 3,
A plurality of the welding regions in the first joint portion form a row in parallel with the tip of the first overlapping region,
A plurality of the welding regions in the second joint portion form a row in parallel with the tip of the second overlapping region,
The said row | line | column is provided two or more, respectively, The absorbent article characterized by the above-mentioned. The absorbent article according to claim 3 or 4,
The sheet member has a first elastic member and a second elastic member,
An end portion of the first elastic member has a portion overlapping the welding region,
The end of the second elastic member is located between the adjacent welding regions. The absorbent article according to claim 5,
The first elastic member and the second elastic member are thread rubber,
In the longitudinal direction,
The absorbent article, wherein an interval between the adjacent welding regions in the first bonding portion and the second bonding portion is smaller than an interval between the adjacent thread rubbers. In the absorptive article according to any one of claims 1 to 6,
At the end of the first joint portion on the waistline opening side, the distance from the base end to the tip of the first joint portion is shorter toward the waistline opening side,
The absorbent article characterized in that, at the end of the second joint portion on the waistline opening side, the distance from the base end to the tip of the second joint is shorter toward the waistline opening side. In the absorptive article according to any one of claims 1 to 7,
The absorbent article, wherein a lower end of the first joint portion and a lower end of the second joint portion are separated from the leg opening by a predetermined distance. In the absorptive article according to any one of claims 1 to 8,
The upper end portion of the belt portion is formed by folding the sheet member,
The said leg gather part is provided with the elastic sheet which can be expanded-contracted in the said vertical direction, The absorbent article characterized by the above-mentioned. The absorbent article according to any one of claims 1 to 12,
With the belt portion stretched in the lateral direction,
The absorbent article, wherein the sheet member has a region located on the other side of the absorbent main body in the first joint portion.

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