TW201707666A - Absorbent article - Google Patents

Abstract

An absorbent article having a vertical direction, a horizontal direction, and a longitudinal direction, and also having: an absorbent body along the vertical direction; and a sheet member comprising a belt section along the horizontal direction and a pair of leg-gather sections along the vertical direction. A trunk opening and a pair of leg openings are formed in the absorbent article. In the vertical direction, a first joined section and a second joined section to which at least the absorbent body and the sheet member are joined are provided on one side and the other side in the longitudinal direction respectively, said first and second joined sections being inclined towards the outside in the horizontal direction from the trunk opening side towards the leg openings. When the belt section is stretched in the horizontal direction, the first joined section has an area positioned further on the other side than the absorbent body.

Description

Absorbent article

The present invention relates to absorbent articles.

In the prior art, as a disposable diaper for a pants type, Patent Document 1 discloses a disposable diaper having an absorbent body formed in a range of an opening on the abdomen side, a lower portion of the crotch portion, and a portion on the back side; and A pair of belt portions combined with the absorbent body.

Such shorts-type disposable disposable diapers are required to look like panties.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Publication No. 8-507699

However, such a shorts-type disposable disposable diaper has a pair of joints formed on the abdomen side and the conspicuous part behind the back side, respectively. The number of the locking portions is increased in comparison with the general disposable diaper in which the joint portion is formed at two locations on both sides. The joint portion has a problem that the rigidity is increased due to the joint, the discomfort is given to the wearer, or the shape of the joint portion that protrudes from the clothes worn on the disposable diaper is recognized. .

The present invention has been made in view of the above conventional problems, and an object thereof is to provide an absorbent article in which the joint portion is inconspicuous.

The main invention for achieving the above object is an absorbent article having an absorbent article in a longitudinal direction, a transverse direction, and a front-rear direction, characterized by having: an absorbent body along the longitudinal direction; and a sheet member, the sheet The member includes a belt portion along the lateral direction and a pair of leg gather portions along the longitudinal direction, and the absorbent article is formed with a waist opening portion and a pair of foot opening portions, at least the absorbent body and the absorbent body The first joint portion and the second joint portion to which the sheet member is joined are respectively provided on one side and the other side in the front-rear direction, and the first joint portion and the second joint portion are opened in the longitudinal direction from the waist joint. The side of the portion is inclined toward the outer side in the lateral direction, and the belt portion has been stretched in the lateral direction, and the first joint portion has the above-mentioned sheet member in comparison with the above-mentioned absorption. The sexual body is located in an area closer to the other side of the foregoing.

Other features of the present invention will become more apparent from the description of the specification and drawings.

According to the present invention, it is possible to provide an absorbent article in which the joint portion is inconspicuous in the region where the sheet member is located closer to the other side than the absorbent body in the first joint portion.

1‧‧‧paper diapers (absorbent articles; disposable disposable diapers)

10‧‧‧Absorbable ontology

10A‧‧‧Absorbent body continuous sheet

10ef‧‧‧ Length direction front side end

10er‧‧‧ Length direction rear end

11‧‧‧Acceptor

13‧‧‧Top sheet

15‧‧‧Back sheet

15f‧‧‧ leakproof sheet

15n‧‧‧Outer sheet

20‧‧‧Fold folds

20A‧‧‧Fold crepe continuous sheet

20eo‧‧‧lateral lateral end

21‧‧‧1st sheet

22‧‧‧2nd sheet

23‧‧‧Folded elastic members (rubber line)

25‧‧‧Fold folds

30‧‧‧Belt Department

30es‧‧‧ transverse section of the belt

30A‧‧‧Continuous sheet of belt

30ei‧‧‧lateral inner end

30eo‧‧‧lateral lateral end

31‧‧‧1st sheet

32‧‧‧2nd sheet

33‧‧‧ Belt elastic members (rubber line)

33a‧‧‧1st elastic member

33b‧‧‧2nd elastic member

35‧‧‧Belt notch

40‧‧‧Sheet members

40A‧‧‧ side continuous sheet

41‧‧‧1st sheet

42‧‧‧2nd sheet

43‧‧‧elastic sheet

HB‧‧‧ Waist opening

HL‧‧‧foot opening

CL‧‧‧Central location

FL‧‧‧return line

FLB‧‧‧Departure

FLb1‧‧‧1st belt end turnback

FLb2‧‧‧2nd belt end turnback

Lwu‧‧‧ interval

L33‧‧‧ interval

LA1‧‧‧1st overlapping area

WL1‧‧‧1st joint

WL2‧‧‧2nd joint

Front end of the first joint of WLp1‧‧

The base end of the first joint of WLb1‧‧

Front end of the second joint of WLp2‧‧

The base of the second joint of WLb2‧‧

WU‧‧‧melting area

Fig. 1 is a schematic perspective view showing the appearance of the disposable diaper 1.

Fig. 2A is a plan view showing the disposable diaper 1 in a state of being elongated in the longitudinal direction. Fig. 2B is a schematic cross-sectional view taken along line A-A of Fig. 2A.

3A is a plan development view showing a state in which the disposable diaper 1 is stretched in the longitudinal direction in the middle of the manufacturing process, and FIG. 3B is a schematic cross-sectional view taken along line B-B of FIG. 3A.

Fig. 4 is a view for explaining an example of a manufacturing process of the disposable diaper 1.

Fig. 5 is a view for explaining a part b of Fig. 2.

Fig. 6 is a view for explaining a portion a in Fig. 1.

FIG. 7 is a view for explaining the first joint portion WL1 of the disposable diaper 1 in a state in which the belt portion 30 is extended in the lateral direction.

Fig. 8A is a schematic cross-sectional view taken along line C-C of Fig. 7. Figure 8B is a schematic cross-sectional view of the D-D section of Figure 7. Figure 8C is a cross-sectional view of the E-E of Figure 7 Intentional section. Figure 8D is a schematic cross-sectional view of the F-F section of Figure 7.

According to the description of the specification and the drawings, at least the following matters can be made clearer.

An absorbent article comprising: an absorbent article in a longitudinal direction, a transverse direction, and a front-rear direction, comprising: an absorbent body along the longitudinal direction; and a sheet member having a belt portion along the lateral direction And the pair of leg gathers along the longitudinal direction, the absorbent article is formed with a waist opening and a pair of foot openings, and at least the first joint and the second joint of the absorbent body and the sheet member are joined The joint portion is provided on one side and the other side in the front-rear direction, and the first joint portion and the second joint portion are in the longitudinal direction, and the horizontal direction is from the waist opening portion side toward the foot circumference opening portion. The outer side is inclined, and in the state in which the belt portion has been extended in the lateral direction, the first joining portion has a region in which the sheet member is located closer to the other side than the absorbent body.

According to such an absorbent article, it is possible to provide an absorbent article in which the joint portion is inconspicuous in the region where the sheet member is located closer to the other side than the absorbent body in the first joint portion.

In the absorbent article, it is preferable that the second joining portion has a region in which the sheet member is located closer to the one side than the absorbent body.

According to such an absorbent article, it can be provided by The second joint portion has a region in which the sheet member is located closer to the other side than the absorbent body, so that the joint portion is not conspicuous to the absorbent article, not only on one side but also when viewed from the other side.

In the absorbent article, it is preferable that the absorbent body and the belt member are joined to each of the first joint portion and the second joint portion, and the absorbent body does not have an elastic member along the lateral direction, and the belt portion has An elastic member along the aforementioned lateral direction.

According to such an absorbent article, the absorbent body and the belt member are joined to the first and second joining portions, respectively, and the absorbent body does not have the elastic member along the lateral direction. However, the belt portion has an elastic member, whereby The first and second joint portions apply force that is pulled in the lateral direction (belt portion side), and the first and second joint portions are made inconspicuous.

In the absorbent article, it is preferable that the belt portion and the foot gather portion are joined to each of the first joint portion and the second joint portion, and the foot gather portion has an elastic member along the longitudinal direction.

According to such an absorbent article, the belt portion and the foot gather portion are joined to each other in the first and second joint portions, and the elastic member along the longitudinal direction is also provided in the foot gather portion, by the belt portion and the foot. Both of the corrugated portions are provided with elastic members, and the rising angles of the first and second joining portions can be changed.

In the absorbent article, it is preferable that the first joining portion is provided in the first joining portion in a region in which the sheet member is located closer to the other side than the absorbent body, and the first joining portion is adjacent to the first joining portion a region where the angle formed by the sheet member is less than 45 degrees, and the sheet member is larger than the absorbent body portion in the second joint portion In a region closer to the one side, a region where the second joining portion and the sheet member adjacent to the second joining portion are formed at an angle of less than 45 degrees is provided.

According to such an absorbent article, the first and second joints can be formed by providing an angle formed by the first joint portion and the sheet member, and an angle formed by the second joint portion and the sheet member not exceeding 45 degrees, respectively. The department is less conspicuous.

In the absorbent article, it is preferable that a portion of the first joint portion that is located between the belt portion and the leg gather portion is provided adjacent to the first joint portion and the belt portion adjacent to the first joint portion. In the region where the angle formed is 45 degrees or more, in the second joint portion, the second joint portion is provided adjacent to the second joint portion at a portion between the belt portion and the foot gather portion. The angle formed by the belt portion is an area of 45 degrees or more.

According to such an absorbent article, in the first and second joint portions, the angle between the first and second joint portions and the belt portion is 45 degrees at a portion between the belt portion and the leg gather portion. In the above region, the wearer can easily recognize the boundary between the belt portion and the foot gather portion, and when worn, can be used as a support portion for lifting the absorbent article. Moreover, since the first and second joint portions that join the belt portion and the leg gather portion can be visually recognized, it is possible to reduce the uneasiness such as peeling of the joint portion.

In the absorbent article, it is preferable that at least the first overlapping region and the second overlapping of the absorbent body and the sheet member are overlapped with each other Each of the first overlapping region and the second overlapping region is provided in the longitudinal direction from the waist opening portion side toward the aforementioned foot opening portion to the lateral direction outer side. In the first overlapping region, at least the absorbent body and the sheet member are joined at the first joining portion, and at least the absorbent body and the sheet member are joined at the second joining portion in the second overlapping region. The front end of the first joining portion is formed at the same position as the front end of the first overlapping region.

According to such an absorbent article, the first joint portion can be made smaller by forming the tip end of the first joint portion and the tip end of the first overlap region at the same position, and the underwear of the damaged absorbent article can be reduced. impression.

===This embodiment ===

As an example of the absorbent article of the first embodiment, a disposable disposable diaper 1 (hereinafter also referred to as [diaper 1]) will be described.

Fig. 1 is a schematic perspective view showing the appearance of the disposable diaper 1. The disposable diaper 1 has an absorbent main body 10, a leg gathers 20, and a belt portion 30, and has a pants-type shape as shown in Fig. 1 when worn. In the shape of a pants type shown in Fig. 1, the disposable diaper 1 has [vertical direction], [lateral direction], and [front-rear direction] orthogonal to each other. Further, a waist opening portion HB is formed on the upper side in the longitudinal direction of the disposable diaper 1, and a pair of foot opening portions HL are formed on both sides in the lateral direction. Further, the front side in the front-rear direction of the disposable diaper 1 covers the portion on the abdomen side of the wearer when worn, and the rear side in the front-rear direction. Covers the wearer's back side.

Fig. 2A is a plan view showing the disposable diaper 1 in a state of being elongated along the longitudinal direction of the absorbent body 10. Fig. 2B is a schematic cross-sectional view taken along line A-A of Fig. 2A. 3A is a plan development view showing a state in which the disposable diaper 1 is unfolded in a state in which it is elongated in the longitudinal direction of the absorbent body 10 in the middle of the manufacturing process. Figure 3B is a schematic cross-sectional view taken along line B-B of Figure 3A. Furthermore, the X-X lines in FIGS. 1 and 2 are the center lines in the lateral direction.

The disposable diaper 1 is in the final stage of the manufacturing process and is in a planar state as shown in Fig. 2A. The manufacturing process of the disposable diaper 1 will be described later using FIG. The paper diaper 1 in a planar state has [longitudinal direction], [lateral direction], and [thickness direction] which are orthogonal to each other in three directions. The longitudinal direction of the disposable diaper 1 is the direction along the longitudinal direction of the absorbent body 10. The longitudinal direction is the direction corresponding to the longitudinal direction of the pants-type state in FIG. 1, but the longitudinal direction of the disposable diaper 1 and the longitudinal direction of the disposable diaper 1 are strictly different. In the case of the difference, the two will be described as [in the longitudinal direction of the pants type state], [in the longitudinal direction of the plane state], and the like. In addition, in FIG. 2A, the state in which the disposable diaper 1 is elongated in the longitudinal direction (that is, the planar state) means that the disposable diaper 1 is overcome by the rubber thread (foot wrinkle elastic member) 23 and belt elasticity which will be described later. In a state in which the contraction force of the member (rubber line) 33 is elongated in the longitudinal direction, the state is extended until the portion where the elastic members are disposed substantially does not recognize wrinkles or wrinkles. Further, the shape of the disposable diaper 1 in a state of being elongated in the longitudinal direction The shape of the disposable diaper 1 is the same as that when the contraction force of each elastic member by the rubber wire 23 or the like is not generated. Moreover, the state in which the disposable diaper 1 is extended in the longitudinal direction may be referred to as the reference state when the absorbent body 10 is only in a planar state, and the disposable diaper 1 is overcome by the contraction force of the elastic member 33. It is elongated in the longitudinal direction, and is formed in a state in which the shape of the absorbent body 10 coincides with the reference shape.

In the state in which the absorbent body 10 has been elongated in the longitudinal direction, the side that abuts against the abdomen side of the wearer is set to the front side (abdominal side) in the longitudinal direction, and the wearer body 10 is placed against the wearer. The side of the back side is set to the rear side (back side) in the longitudinal direction. The horizontal direction of the disposable diaper 1 is the same as the horizontal direction and the thickness direction of the disposable diaper 1 of the pants type of FIG. The thickness direction of the disposable diaper 1 is a direction perpendicular to the longitudinal direction and the transverse direction, and the side in contact with the wearer's skin is set to [skin side], and the opposite side is set to [non-skin side].

As shown in FIG. 2A and FIG. 2B, in the paper diaper 1 in a flat state, the absorbent main body 10 is arranged along the longitudinal direction, and a pair of leg gathers 20 are disposed on both sides in the lateral direction of the absorbent main body 10. Further, a pair of belt portions 30 are disposed so as to overlap a part of the absorbent main body 10 and the skin wrinkle portion 20 in the thickness direction. The disposable diaper 1 is formed as shown in Fig. 3A, and the leg gathers 20 and the belt portion 30 are formed by a sheet member, that is, the side sheet 40. The sheet wrinkle portion 20 and the belt portion 30 are formed by folding back the sheet member 40 in the lateral direction on the return line FL extending in the longitudinal direction.

The foot wrinkle portion 20 is provided at the outer end portion in the lateral direction A part of the 20eo (return line FL) is cut by the formed foot wrinkle portion 25. Similarly, the belt portion 30 is provided with a belt notch portion 35 formed by cutting a part of the outer end portion 30eo (the return line FL) in the lateral direction. The foot opening portion HL is formed by the foot wrinkle notch portion 25 and the belt notch portion 35.

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

By opening the lateral inner end portions 30ei, 30ei of the pair of belt portions 30, 30 toward the inner side in the lateral direction, and folding the absorbent body 10 in the vicinity of the center position CL in the longitudinal direction, such a planar state can be obtained. The disposable diaper 1 is formed in a state in which the pants-type diaper 1 can be worn. At this time, the waist opening portion HB is formed by the longitudinal direction front end portion 10ef of the absorbent main body 10, the longitudinal direction rear end portion 10er, and the inner end portion 30ei of the pair of belt portions 30 (see FIG. 1).

As shown in FIG. 2A, the absorbent body 10 is a substantially rectangular member (see FIG. 3A) extending in the longitudinal direction, and is cut along the first joining portion WL1 and the second joining portion WL2, and each end portion in the longitudinal direction is respectively The front end is thinned into a sheet-like member having a substantially V-shaped planar view. absorb The main body 10 includes an absorbent body 11 , a top sheet 13 (corresponding to a skin side sheet) provided to cover the absorbent body 11 from the skin side, and a back sheet 15 provided to cover the absorbent body 11 from the non-skin side (corresponding to the non-skin Skin side sheet). Each of the members 13, 11, and 15 is joined to a member adjacent to the thickness direction by a hot melt adhesive or the like (see FIGS. 2B and 3B). Further, examples of the application pattern of the adhesive include an Ω pattern, a spiral pattern, a stripe pattern, and the like, and the other adhesives which are present after the adhesives mentioned herein are also the same.

The absorber 11 is provided with an absorbent core material in which a predetermined liquid-absorbent material is formed into a predetermined shape (for example, a plan view angle is a slightly hourglass shape); and a core-wrap sheet covering the outer peripheral surface of the absorbent core material, A member for absorbing a liquid such as urine when the disposable diaper 1 is worn. Examples of the liquid-absorbent material include liquid-absorbent fibers such as pulp fibers and liquid-absorbent particles such as superabsorbent polymers (so-called SAP). As the core material wrapping sheet, a liquid permeable sheet such as a tissue or a nonwoven fabric can be used. Further, the shape of the absorber 11 is not limited to the shape of a slightly hourglass clock in the plane view angle shown in FIG. 3A, and may be other shapes.

The top sheet 13 is formed of a liquid permeable sheet such as a hot air non-woven fabric, and its planar size is a size that can protrude from both sides in the longitudinal direction of the absorber 11 and both sides in the lateral direction. However, the top sheet 13 is not limited thereto, and may be formed of a sheet member having a liquid absorbability.

As shown in FIG. 3B, the back sheet 15 is formed by superposing and joining two sheet members of the leakage preventing sheet 15f and the exterior sheet 15n in the thickness direction. The leakage preventing sheet 15f is made of a polyethylene (PE) film, The liquid-impermeable sheet member formed of a liquid-impermeable sheet member such as a polypropylene (PP) film is disposed on the skin side in the thickness direction of the back sheet 15. The exterior sheet 15n is a sheet member composed of a nonwoven fabric or the like, and is disposed on the non-skin side in the thickness direction of the back sheet 15, and constitutes an exterior member of the absorbent body 10. However, the back sheet 15 is not limited to the above-described structure if it has a certain leakproof property. The back sheet 15 is also a sheet having a planar size that protrudes from both sides in the longitudinal direction of the absorber and both sides in the lateral direction. Further, the top sheet 13 and the back sheet 15 are overlapped and joined in the thickness direction so as to substantially coincide with each other in the longitudinal direction at both ends in the longitudinal direction, whereby the absorbent body is held between the sheets 13 and 15.

As shown in FIG. 3A and FIG. 3B, the foot wrinkle portion 20 is a sheet member that is joined to the longitudinal direction of both sides in the lateral direction of the absorbent body 10, and when the disposable diaper 1 is formed into a pants type, along the foot circumference The opening portion HL is contracted to form a wrinkled foot wrinkle. The leg gathers 20 are formed such that the first sheet 21 and the second sheet 22 formed of a nonwoven fabric or the like are overlapped in the thickness direction. Further, the joining of the absorbent body 10 and the foot gather portion 20 is performed by the lateral inner end portion of the foot gather portion 20 between the top sheet 13 and the back sheet 15 which are sandwiched between the absorbent body 10. In the state, it is carried out by a hot melt adhesive or the like.

As shown in FIG. 3A and FIG. 3B, the belt portion 30 is a sheet member that is joined to the longitudinal direction of both sides in the lateral direction of the foot gather portion 20, and when the disposable diaper 1 is formed into a pants type, a waist belt is formed ( Refer to Figure 1). The belt portion 30 is formed such that the first sheet 31 and the second sheet 32 formed of a nonwoven fabric or the like are overlapped 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 of one member. In other words, the first sheet 21 of the leg gather portion 20 and the first sheet 31 of the belt portion 30 are constituted by the first sheet 41, and the second sheet 22 of the leg gather portion 20 and the second sheet of the belt portion 30 are formed. 32 is also constituted by the second sheet 42. In the present embodiment, the portion of the sheet member 40 that is closer to the inner side in the lateral direction than the return line FL is formed as the leg gather portion 20, and the portion on the outer side in the lateral direction of the return line FL is formed as the belt portion 30.

Further, the foot opening portion HL is formed to extend across the return line FL. As described above, the foot opening portion HL is a leg gather notch portion 25 formed by cutting the first sheet 21 and the second sheet 22 of the leg gather portion 20, and the first sheet 31 of the belt portion 30 and The belt notch portion 35 formed by cutting the second sheet 32 is formed.

Further, between the first sheet 21 and the second sheet 22 of the leg gathers 20, a foot wrinkle elastic member (rubber line) 23 composed of a rubber thread or the like is placed in a state of being elongated in the longitudinal direction, and It is fixed by a hot melt adhesive or the like. In FIG. 3A, two rubber cords 23 are disposed at a position inside the lateral inner end portion of the foot wrinkle notch portion 25 (that is, the lateral inner end portion of the foot opening portion HL). The rubber cord 23 provides the leg gathers 20 with stretchability in the longitudinal direction. As a result, when the disposable diaper 1 is formed into a pants type, the leg gathers 20 are contracted along the foot opening portion HL to form wrinkled foot wrinkles, which improves the fit of the wearer's foot circumference.

Similarly, the first sheet 31 and the second portion of the belt portion 30 Between the sheets 32, a belt elastic member (rubber line) 33 composed of a rubber thread or the like is disposed in a state of being elongated in the longitudinal direction, and is fixed by a hot melt adhesive or the like. In FIG. 3A, a plurality of rubber wires 33 are arranged in the lateral direction in a region outside the laterally outer end portion of the belt notch portion 35 (that is, the lateral outer end portion of the foot opening portion HL). The belt portion 30 is stretched in the longitudinal direction by the rubber wire 33. As a result, when the disposable diaper 1 is formed into a pants type, the contraction force along the waist opening portion HB is generated over substantially the entire area of the belt portion 30, and the deviation of the waist circumference when the disposable diaper 1 is worn can be suppressed from falling.

Further, between the first sheet 41 (21, 31) and the second sheet member 42 (22, 32), an elastic sheet 43 formed of a stretchable nonwoven fabric or the like is preferably provided. As shown by the hatched portion in FIG. 3A, the elastic sheet 43 is a strip-shaped elastic sheet member having a width wider than the width of the foot opening portion HL in the lateral direction, and has an opening having the same shape as the foot opening portion HL, in the length The sheet 41, 42 is fixed by a hot melt adhesive or the like in a state in which the direction is elongated. Thereby, the entire circumference of the peripheral portion of the foot opening portion HL is reinforced by the elastic sheet 43 (the sand pattern portion of FIG. 1). Moreover, the fit of the peripheral edge portion of the foot opening portion HL can be further improved by the contraction force generated by the planar elastic sheet 43. It is assumed that when the elastic sheet 43 is not provided at the peripheral portion of the foot opening portion HL and only the rubber thread such as the rubber thread 23 is provided, wrinkles are easily formed between the rubber thread and the rubber thread, and when the disposable diaper 1 is worn, There is a possibility that the stagnation of the opening HL of the foot or the trace of the rubber thread remains on the skin. On the other hand, by arranging the elastic sheet 43 in the planar state at the peripheral edge portion of the foot opening portion HL, it is possible to combine Physical improvement. Further, since the general disposable diaper 1 is made of a material having a light color such as a non-woven fabric, the color of the first joining portion WL1 in which a plurality of members are joined is increased. However, when the elastic sheet 43 is disposed, the number of members is increased. The color of the first joint portion WL1 becomes inconspicuous.

As an example of the elastic sheet 43, for example, a nonwoven fabric having a slightly elastic elastomer such as a polyurethane elastomer or a nonwoven fabric having a slightly inelastic thermoplastic resin such as a polyolefin resin is used. The non-woven fabric is produced by the gear extension processing, but is not limited thereto.

Further, as shown in FIG. 3B, in the laterally outer end portion of the belt portion 30, the first belt end portion return line FLb1 and the second belt end portion return line FLb2 are folded back twice in the lateral direction, and then hot melt adhesive is used. The subsequent agent or the like is fixed in the folded-back state, and it is preferable to provide the folded-back portion FLB (FIG. 1). The second belt end turn-back line FLb2 is a portion formed as a lateral inner end portion 30ei of the belt portion 30 in FIG. 2A, and is a portion of the waist opening portion HB. By forming the waist opening portion HB as such an end portion folding structure, when the disposable diaper 1 is worn, the pressure of the wearer's waist circumference can be reduced. Further, similarly to the elastic sheet 43 of the foot opening portion HL, the waist opening portion HB can make the color of the first joint portion WL1 inconspicuous by the folded portion FLB in which a plurality of members are superposed, and the loss of the similar underwear can be reduced. The impression of the ambiguity. However, the lateral end region may not be a folding structure as described above.

<About the manufacture of disposable diapers 1>

Next, a method of manufacturing the disposable diaper 1 will be briefly described. Fig. 4 is a view for explaining an example of a manufacturing process of the disposable diaper 1.

In this example, the disposable diaper 1 is manufactured by applying predetermined processing (S101 to S105) to the base sheet while conveying the base material sheet as the material in the conveyance 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 the direction along the longitudinal direction (longitudinal direction) of FIG. 2A, and the CD direction is the direction along the lateral direction of FIG. 2A.

In the present embodiment, the sheet member which becomes the base sheet of the disposable diaper 1 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 bodies 10 are continuously arranged in the longitudinal direction (longitudinal direction). In other words, the absorbent main body continuous sheet 10A is a sheet member in a state in which a plurality of absorbent bodies 11 are sandwiched between the continuous sheets of the top sheet 13 extending in the MD direction and the continuous sheet of the back sheet 15. Similarly, the side continuous sheet 40A is a sheet member in which the sheet member 40 forming the foot gather portion 20 and the belt portion 30 are continuously arranged in the longitudinal direction (longitudinal direction).

First, as shown in FIG. 4, the base sheet in a state in which the side continuous sheet 40A is joined to both sides in the CD direction (lateral direction) of the absorbent main continuous sheet 10A is continuously conveyed in the MD direction (S101).

Then, the base sheet to be conveyed is formed at a position across the return line FL on both sides in the CD direction (lateral direction) of the absorber 11, and a foot gather notch portion 25 and a belt notch portion 35 as the foot opening portion HL are formed ( S102). The notch portion is formed using a cutting roller or the like (not shown). Again, in Figure 4 The state indicated by the process S102 is the state of the disposable diaper 1 corresponding to the unfolded state of FIG. 3A.

Then, the portion corresponding to the belt portion 30 of the side continuous sheet 40A is folded back toward the CD direction (lateral direction) on the return line FL, and is formed as a part of the absorbent body 10 and the leg gather portion and the belt portion 30 in the thickness direction. The state of repetition (S103).

Then, the first joint portion WL1 and the second joint portion WL2 are formed by ultrasonic fusion, and the belt portion 30 is joined to the absorbent body 10 and the foot gather portion 20 (S104).

Then, the substrate sheet is cut (S105). Specifically, the paper diaper 1 is cut out from the base sheet continuous in the MD direction so as to be individual, and the four corners of the rectangle are further cut along the first joining portion WL1 and the second joining portion WL2. At this time, it is preferable to form the front end WLp1 of the first joint portion and the front end WLp2 of the second joint portion in the cut molten region WU (described later). By cutting the molten region WU, it is possible to reduce the detachment from the leading end WLp1 of the first joining portion and the leading end WLp2 of the second joining portion.

Thereby, the disposable diaper 1 in the planar state shown in FIG. 2A was formed.

<About the first joint portion WL1 and the second joint portion WL2>

Hereinafter, the first bonding portion WL1 and the second bonding portion WL2 will be described in more detail.

The first joint portion WL1 is formed in a pair on the front side in the front-rear direction, symmetrically with respect to the center line X-X, and the second joint portion WL2 is in the front-rear direction. On the rear side, the center line X-X is symmetrically arranged in a pair. Since the first joining portion WL1 and the second joining portion WL2 have the same configuration in the front-rear direction, the first joining portion WL1 will be described below.

As shown in FIG. 1 , the first joint portion WL1 has a shape that is inclined from the longitudinal direction front end portion 10ef near the center in the lateral direction of the absorbent body 10 toward the foot opening portion HL, and the absorbent body 10 and the belt portion 30 are provided. The portion where the leg gathers 20 are joined to the belt portion 30. At this time, the distal end WLp1 of the first joint portion located at the outermost side in the lateral direction of the first joint portion WL1 is substantially parallel to the base end WLb1 of the first joint portion located at the innermost side in the lateral direction of the first joint portion WL1.

The length of the first joining portion WL1 in the longitudinal direction is the distance from the waist opening portion HB to the lower end of the first joining portion WL1, and the length of the end portion of the belt portion 30 in the lateral direction is from the waist opening portion HB to the outside of the belt portion 30. The end portion is the length of the lower end of the belt portion lateral end portion 30es. 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 longitudinal direction, the lower end of the first joint portion WL1 is formed on the lower side of the lower end of the belt portion lateral end portion 30es. As a result, the belt portion 30 is stretched in the lateral direction by the rubber thread 33, and a portion that does not expand and contract in the lateral direction is formed on the lower side of the first joint portion WL1. Therefore, the joint strength of the first joint portion WL1 can be improved.

Further, it is preferable that the lower end of the first joint portion WL1 is separated from the foot opening portion HL by a predetermined distance. In the present embodiment, the foot gather portion 20 and the belt portion 30 are formed by one sheet member 40. At this time, the lower end of the first joint portion WL1 is formed to be separated from the foot opening portion HL by only a predetermined distance (for example) When the upper side is about 2 to 10 mm, the portion where the leg gather portion 20 is connected to the belt portion 30 is formed. The laterally outer end portion 20eo of Fig. 2 is a portion in which the leg gather portion 20 formed in the pants-type state shown in Fig. 1 is connected to the belt portion 30. Thereby, it is possible to prevent the lower end of the first joint portion WL1 having high rigidity from directly contacting the wearer's skin, and it is possible to reduce the discomfort felt by the wearer. Further, since the first joining portion WL1 that joins the leg gather portion 20 and the belt portion 30 is joined to one sheet member 40, the joint strength can be further improved, and peeling of the joint portion can be reduced.

Fig. 5 is a view for explaining a part b of Fig. 2.

As shown in FIG. 5, in the first joint portion WL1, a plurality of molten regions WU joined by ultrasonic bonding are formed. In the present embodiment, the first joining portion WL1 is joined by ultrasonic bonding, but it may be joined by using an adhesive such as hot-melt melting or hot melt adhesive.

The disposable diaper 1 is generally formed of a non-woven fabric, and thus has a characteristic of being soft and having a good touch. However, when the molten region WU is formed in the entire region of the first bonding portion WL1 without a gap, the first bonding portion WL1 is hard. Therefore, in the present embodiment, the plurality of triangular molten regions WU are formed, and the joined portion and the unjoined portion are provided in the region of the first joined portion WL1, and the first joined portion WL1 can be made lighter.

At this time, a plurality of molten regions WU are sequentially arranged in parallel with the tip end WLp1 of the first joining portion (the first overlapping region LA1 to be described later) to form a molten region WU column, and the molten region WU column and the front end of the first joining portion are formed. It is preferable that WLp1 sets the plural columns in parallel. The row arranged in the direction of the arrow R1 in Fig. 5 is a column on the side of the proximal end WLb1 of the first joint portion, and is arranged in the arrow The row in the R2 direction is a column on the side of the front end WLp1 of the first joining portion. For example, even when the wearer or the like is applied, an excessive force is applied to the first joint portion WL1, and the row R1 of the molten region WU on the proximal end WLb1 side of the first joint portion is peeled off, and the first joint portion is maintained. The joining of the row R2 of the molten region WU on the front end WLp1 side can reduce the flaw of the first joining portion WL1 being completely peeled off.

Further, in the front end WLp1 of the first joining portion, a portion where the molten region WU overlaps the rubber yarn 33 and a portion that does not overlap are preferably formed. When the rubber wire 33 that overlaps the molten region WU is the first elastic member 33a, and the rubber wire 33 that does not overlap the molten region WU is the second elastic member 33b, the first joint portion has the first end WLp1. In the portion of the elastic member 33a, not only the absorbent body 10 but also the sheet member 40 and the first elastic member 33a overlap each other. Therefore, when the ultrasonic bonding is performed from the upper surface thereof, the joint strength is lowered by the first elastic member 33a. possibility. However, the second elastic member 33b that does not overlap the molten region WU is provided at the distal end WLp1 of the first joint portion, and the second elastic member 33b located between the adjacent molten regions WU is provided, whereby the joint of the first joint portion WL1 can be reduced. The strength is reduced.

Further, the interval L33 between the adjacent rubber threads is preferably smaller than the interval Lwu of the adjacent molten regions WU. At this time, the interval L33 between the adjacent rubber wires 33 is a distance from the center of the rubber wire 33 to the center of the adjacent rubber wire 33 (hereinafter also referred to as [pitch]), and the interval Lwu of the adjacent molten regions WU is The distance from the center of gravity of the molten region WU to the center of gravity of the adjacent molten region WU. Rubber line 33 is provided with rubber line 33 The portion has a spring force that is pulled in the lateral direction. However, since the elastic force of the rubber wire 33 acts to be smaller than the pitch of the molten region WU, the joint strength of the first joint portion WL1 can be further improved.

Fig. 6 is a view for explaining a portion a in Fig. 1.

When the distance from the proximal end WLb1 of the first joint portion to the distal end WLp1 of the first joint portion is L, the closer to the waist opening portion HB, the shorter the L is. As shown in FIG. 6 , in the order of L1, L2, and L3, when the waist opening portion HB is relatively close, L1 < L2 < L3. The first joint portion WL1 is formed so as to be cut from the front end WLp1 of the first joint portion of the upper portion of the first joint portion WL1 on the side of the waist opening portion HB toward the base end WLb1 of the first joint portion. As a result, the first joint portion WL1 can be made inconspicuous, and the wearer feels uncomfortable when the first joint portion WL1 comes into contact with the wearer's abdomen when worn.

FIG. 7 is a view for explaining the first joint portion WL1 of the disposable diaper 1 in a state in which 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 disposable diaper 1 is extended in the lateral direction is a state in which the belt portion 30 is stretched in the lateral direction in a state in which the wearer wears the disposable diaper 1. In the state of being stretched from the rubber thread 33 of the belt portion 30 to a state where the wrinkles and the wrinkles are not confirmed in the lateral direction, the state is contracted by 48 to 78% (preferably, the state of shrinkage is 63%).

8A is a schematic sectional view showing a CC section of FIG. 7, FIG. 8B is a schematic sectional view showing a DD section of FIG. 7, and FIG. 8C is a schematic sectional view showing the EE section of FIG. 7, and FIG. 8D. Show F- of Figure 7 Schematic cross-section of the F section. 8A is a cross-sectional view showing a portion where the absorbent body 10 and the folded portion FLB of the belt portion 30 are joined to each other in the first joint portion WL1, which is higher than the first belt end portion return line FLb1. FIG. 8B shows a portion where the belt portion 30 that is lower than the folded portion FLB in the first joint portion WL1 is joined to the absorbent body 10. 8C and 8D show a portion where the foot gather portion 20 is joined to the belt portion 30.

As shown in FIGS. 8A, 8B, 8C, and 8D, the portion where the sheet member 40 (31, 32) constituting the belt portion 30 and the absorptive body 10 overlap each other is the first overlap region LA1, and the first overlap region LA1 here. The molten region WU is formed as the first bonding portion WL1. In this case, it is preferable that the front end WLp1 of the first joint portion and the front end of the first overlap region LA1 are formed at the same position. Specifically, in the manufacturing process S104, the first bonding portion WL1 is formed in the first overlapping region LA1, and in S105, the portion overlapping the first overlapping region LA1 and the first bonding portion WL1 is cut, whereby the first bonding portion WL1 can be used. The front end WLp1 of the joint portion is formed at the same position as the front end of the first overlap region LA1.

Thereby, the first joint portion WLp1 can be further reduced, and the impression of the pant-like diaper 1 having the damaged joint portion provided on the front side of the abdomen side can be reduced. In addition, the front end WLp1 of the first joining portion of the disposable diaper 1 in the state in which the belt portion 30 is extended in the lateral direction is formed at the same position as the front end of the first overlapping region LA1, and the general shorts type paper of FIG. Similarly to the diaper 1, the distal end WLp1 of the first joint portion and the distal end of the first overlap region LA1 are formed at the same position.

Moreover, as shown in FIG. 8A and FIG. 8B, the first joint portion WL1 In the portion where the absorbent body 10 is joined to the belt portion 30, it is preferable that the absorbent body 10 is located on one side in the front-rear direction, and the sheet member 40 is located closer to the other side than the absorbent body 10. In other words, the first joint portion WL1 is inclined toward the belt portion 30 side, and the front end portion WLp1 of the first joint portion is preferably located on the belt portion 30 side.

As a result, it is possible to reduce the discomfort of the wearer feeling agglomerates or the like due to the first joint portion WL1 having a high rigidity, or to reduce the visibility of the first joint portion WL1 protruding from the clothing worn on the disposable diaper. The first joint portion WL1 can be made inconspicuous.

At this time, the absorbent body 10 does not have the elastic member in the lateral direction, and the belt portion 30 has the belt elastic member 33 (FIG. 7) such as a rubber thread, whereby the first joint portion inclined toward the belt portion 30 side can be formed. WL1. Since the force of pulling in the lateral direction (the belt portion 30 side) is applied to the first joint portion WL1, the first joint portion WL1 is inclined toward the belt portion side, and the first joint portion WL1 can be made less conspicuous.

When the angle formed by the first joining portion WL1 and the adjacent sheet member 40 (31) is θ, the angle θ1 formed by the first joining portion WL1 of the folded portion FLB of FIG. 8A and the adjacent sheet member 40 is 45 degrees is small. Similarly, the angle θ2 formed by the first joint portion WL1 of the belt portion 30 that is lower than the folded portion FLB and the adjacent sheet member 40 in FIG. 8B is preferably smaller than 45 degrees. Thereby, the first joint portion WL1 can be made more conspicuous.

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

Further, as shown in FIG. 8C, in the first joint portion WL1, the rubber line 23 along the longitudinal direction of the leg gather portion 20 and the portion of the belt portion 30 that intersects the rubber line 33 in the lateral direction are θ3. vertical. In the present embodiment, it is produced by the action of the rubber wire 23 having a force pulling in the longitudinal direction and the rubber wire 33 having a force pulling in the lateral direction.

Further, in the FF cross section shown in FIG. 7, the rubber gathers 23 and 33 are not provided in the leg gathers 20 and the belt portion 30 joined by the first joint portion WL1, but the leg gathers 20 are provided. The rubber wire 23 is provided closer to the vicinity of the FF cross section than the rubber wire 33 of the belt portion 30, so that the first joint portion WL1 is affected by the pulling force of the rubber wire 23, and θ4 is formed at an angle larger than θ3.

In this manner, not only the rubber wire 33 of the belt portion 30 but also the rubber wire 23 is provided in the leg gather portion 20, whereby the angle θ formed by the first joint portion WL1 and the adjacent sheet member 40 can be changed. Further, by presenting the first first joint portion WL1, the impression of the underwear can be felt, and the wearer of the disposable diaper 1 can visually recognize the first difference by the difference in the inclination of the first joint portion WL1. The joint portion WL1 can alleviate the uneasiness such as peeling of the joint portion. Further, it becomes easy to recognize the boundary between the leg gathers 20 and the belt portion 30, and it can be used as a mark for supporting the lifting portion of the disposable diaper 1 when worn.

===Other implementations ===

The embodiments of the present invention have been described above, but the embodiments are intended to facilitate the understanding of the present invention and are not intended to limit the scope of the present invention. Further, the present invention can be modified and improved without departing from the scope of the technical idea, and the present invention naturally includes equivalents thereof. For example, the following modifications can be made.

In the above embodiment, the molten region WU is formed in a triangular shape, but is not limited thereto. For example, the molten region WU may be formed into various shapes such as a circular shape and a quadrangular shape, or a plurality of molten regions in a rod shape parallel to the distal end WLp1 of the first joint portion and the distal end WLp2 of the second joint portion may be provided.

Further, in the above-described embodiment, the first joining portion WL1 is formed on the front side and the second joining portion WL2 is formed on the rear side. However, it is not always necessary to form the second joining portion WL2 on the rear side. By providing at least the first joint portion WL1 on the front side which is easily noticed, it is possible to give the wearer an impression similar to the underwear. However, by providing the second joint portion WL2 on the rear side, not only the front side but also the rear side can impart the similarity of the undergarment.

1‧‧‧paper diapers (absorbent articles; disposable disposable diapers)

10‧‧‧Absorbable ontology

10ef‧‧‧ Length direction front side end

20‧‧‧Fold folds

20eo‧‧‧lateral lateral end

23‧‧‧Folded elastic members (rubber line)

30‧‧‧Belt Department

30es‧‧‧ transverse section of the belt

30ei‧‧‧lateral inner end

30eo‧‧‧lateral lateral end

33‧‧‧ Belt elastic members (rubber line)

43‧‧‧elastic sheet

HB‧‧‧ Waist opening

HL‧‧‧foot opening

FLB‧‧‧Departure

WL1‧‧‧1st joint

Front end of the first joint of WLp1‧‧

The base end of the first joint of WLb1‧‧

Claims (7)

An absorbent article comprising: an absorbent article in a longitudinal direction, a transverse direction, and a front-rear direction, comprising: an absorbent body along the longitudinal direction; and a sheet member having a belt along the lateral direction And a pair of leg gathers along the longitudinal direction, the absorbent article is formed with a waist opening and a pair of foot openings, and at least the first joint of the absorbent body and the sheet member is joined And the second joint portion is provided on one side and the other side in the front-rear direction, and the first joint portion and the second joint portion are formed in the longitudinal direction from the waist opening portion side toward the foot circumference opening portion. In the state in which the belt portion has been inclined outward in the lateral direction, the first joint portion has a region in which the sheet member is located closer to the other side than the absorbent body. The absorbent article according to claim 1, wherein the second joining portion has a region in which the sheet member is located closer to the one side than the absorbent body. The absorbent article according to claim 2, wherein the absorbent body and the belt member are joined to each of the first joint portion and the second joint portion, and the absorbent body does not have the lateral direction In the elastic member, the belt portion has an elastic member along the lateral direction. The absorbent article according to claim 3, wherein the belt portion and the foot gather portion are joined to each of the first joint portion and the second joint portion, and the foot gather portion has the aforementioned An elastic member in the longitudinal direction. The absorbent article according to any one of claims 2 to 4, wherein the first joining portion is provided in a region in which the sheet member is located closer to the other side than the absorbent body The first joining portion and the region formed by the sheet member adjacent to the first joining portion are not more than 45 degrees, and the sheet member is located closer to the absorbent member than the absorbent member in the second joining portion. In the side region, a region where the second joining portion and the sheet member adjacent to the second joining portion are formed at an angle of less than 45 degrees is provided. The absorbent article according to any one of claims 2 to 4, wherein the first joint portion is provided at a portion between the belt portion and the leg gather portion, and the first joint portion is provided The angle formed by the belt portion adjacent to the first joint portion is 45 degrees or more, and the second joint portion is located at a portion between the belt portion and the leg gather portion. The angle formed by the joint portion and the belt portion adjacent to the second joint portion is a region of 45 degrees or more. An absorbent article according to any one of claims 1 to 4, wherein At least one of the first overlapping region and the second overlapping region in which the absorbent body and the sheet member are joined to each other is provided on one side and the other side in the front-rear direction, and the first overlapping region and the second overlapping region are in the longitudinal direction. The direction of the waist opening is inclined toward the outer side in the lateral direction from the side of the waist opening, and at least the absorbent body and the sheet member are joined to each other in the first joining portion in the first overlapping region. In the overlap region, at least the absorbent body and the sheet member are joined to each other at the second joining portion, and the front end of the first joining portion is formed at the same position as the front end of the first overlapping region.