TW201705925A - Absorbent article - Google Patents

Abstract

An absorbent article having a vertical direction, a horizontal direction, and a front/rear direction and 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 overlapping area and a second overlapping area wherein at least the absorbent body and the sheet member are overlapped are provided on one side and the other side in the front/rear direction, respectively, said areas being inclined towards the outside in the horizontal direction, from the trunk opening side towards the leg openings. In the first overlapping area, at least the absorbent body and the sheet member are joined in a first joining area. In the second overlapping area, at least the absorbent body and the sheet member are joined in a second joined area. The tip of the first joined area is formed at the same position as the tip of the first overlapping area.

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. In this case, when the absorbent body and the joint portion of the belt portion are joined by an adhesive or the like, the rigidity of the joint portion is increased, which causes a discomfort to the wearer, and therefore, it is called a dry side. A region where no adhesive or the like is applied is provided at a position further forward than the front end of the joint portion to reduce the discomfort of the wearer.

[Previous Technical Literature] [Patent Document]

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

However, such a shorts-type disposable disposable diaper has a pair of joint portions formed on the front side of the abdomen side and the rear side of the back side, respectively, and a joint portion is formed in comparison with the two portions on both sides. In the diaper, the number of the locking portions is increased. When the dry side is provided at the joint portion, the joint portion becomes large, and even in the state in which the clothes are worn, the joint portion or the like can be recognized in appearance, which is a cause of impairing the similarity of the undergarment.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide an absorbent article which looks more like a pair of underpants.

The main object of the present invention is to provide an absorbent article having an absorbent article in the longitudinal direction, the transverse direction, and the front-rear direction, comprising: an absorbent body along the longitudinal direction; and a belt member in the lateral direction and a sheet member along the pair of leg gathers in the longitudinal direction, the absorbent article is formed with a waist opening portion and a pair of foot opening portions, and the waist opening is formed in the longitudinal direction The first overlapping region and the second overlapping region in which at least the absorbent main body and the sheet member are overlapped with each other toward the outer side in the lateral direction opening portion are provided on one side and the other side in the front-rear direction, respectively. In the first overlapping region, at least the absorbent body and the sheet member are joined at the first joining portion, and in the second overlapping region, The absorptive main 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.

Other features of the present invention will become more apparent from the description and appended claims.

According to the present invention, by forming the distal end of the first joint portion and the distal end of the first overlap region at the same position, the first joint portion can be made smaller, and the impression of the similar underwear having the damaged absorbent article can be reduced.

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 unfolded in a state of being elongated in the longitudinal direction in the middle of the manufacturing process. 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 stretched in the lateral direction.

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

According to the description of the present specification and the accompanying 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 belt portion along the lateral direction, and along In the sheet member of the pair of leg gathers in the longitudinal direction, the absorbent article is formed with a waist opening portion and a pair of foot opening portions, and is oriented in the longitudinal direction from the waist opening portion side toward the foot circumference opening portion. At least one of the first overlapping region and the second overlapping region in which the absorbent body and the sheet member are overlapped with each other in the lateral direction is provided on one side and the other side in the front-rear direction, and at least the aforementioned first overlapping region The absorptive main body and the sheet member are joined to each other in the first joining portion, and at least the absorbent main body and the sheet member are joined to each other in the second joining portion, and the front end of the first joining portion is formed in the second joining portion. The front end of the first overlapping region is at the same position.

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 similar underwear of the damaged absorbent article can be reduced. impression.

In the absorbent article, it is preferable that the front end of the second joining portion is formed at the same position as the front end of the second overlapping region.

According to such an absorbent article, the tip end of the second joining portion and the tip end of the second overlapping portion are formed at the same position, so that not only the first joining portion but also the second joining portion can be reduced. The impression of a similar underpants that damage the absorbent article.

In the absorbent article, it is preferable that the absorbent body and the sheet member are joined to each other in a plurality of molten regions in the first joining portion and the second joining portion.

According to such an absorbent article, the first and second joining can be achieved by joining the absorbent main body and the sheet member in a plurality of molten regions, compared to the case where the first joining portion and the second joining portion are integrally melted. The portion is inconspicuous, and the rigidity of the first and second joint portions can be reduced.

In the absorbent article, it is preferable that a plurality of the molten regions in the first joining portion are formed in parallel with a tip end of the first overlapping region, and a plurality of the molten regions in the second joining portion are the second portion The front ends of the overlapping regions are formed in parallel in parallel, and two or more columns are provided in the above columns.

According to such an absorbent article, two or more of the plurality of melting regions are arranged in parallel with the tips of the first and second overlapping regions, and even one of the first and second joining portions is arranged. Since the molten region is peeled off and the other molten regions of the columns are also joined, the bonding of the absorbent article can be alleviated.

In the absorbent article, the sheet member has a first elastic member and a second elastic member, and an end portion of the first elastic member has a portion overlapping the molten region, and an end portion of the second elastic member is located adjacent to each other Between the molten areas.

According to such an absorbent article, since the end portion of the first elastic member of the sheet member has a portion overlapping the molten region, the end portion of the second elastic member is provided between the adjacent molten regions, and the elastic member can be prevented. The influence of melting or the like is inhibited, and the joint strength between the first and second joint portions can be improved.

In the absorbent article, it is preferable that the first elastic member and the second elastic member are rubber threads, and in the longitudinal direction, the interval between the adjacent first molten portion and the second joined portion is higher The interval between the adjacent rubber lines is small

According to such an absorbent article, the interval between the adjacent molten regions in the first and second joining portions is made smaller than the interval between the adjacent rubber threads in the longitudinal direction, whereby the joint strength can be further improved.

In the absorbent article, the distance from the base end to the tip end of the first joining portion is shorter toward the waist opening portion side at the end portion of the first joining portion on the side of the waist opening portion. The end portion of the joint portion on the side of the waist opening portion is shorter from the base end to the front end of the second joint portion as it is closer to the waist opening portion side.

According to such an absorbent article, the distance from the base end to the front end of each of the first and second joining portions is closer to the waist circumference at the base end of the waist opening portion side of the first and second joining portions. The side of the opening Short, the first and second joint portions can be made inconspicuous. Further, it is possible to prevent the first and second joint portions from coming into contact with the wearer's skin when worn, and it is possible to reduce the discomfort felt by the wearer.

In the absorbent article, it is preferable that the lower end of the first joining portion and the lower end of the second joining portion are separated from the foot opening portion by a predetermined distance.

According to the absorbent article, the lower end of the first and second joining portions is separated from the opening of the foot by a predetermined distance, thereby preventing the lower end of the first and second joining portions from directly contacting the wearer's skin. Reduce the discomfort felt by the wearer.

In the absorbent article, it is preferable that the upper end portion of the belt portion is formed by folding back the sheet member, and the leg gather portion is provided with an elastic sheet that can expand and contract in the longitudinal direction.

According to such an absorbent article, since the upper end portion of the belt portion is formed by folding the sheet member, the foot gather portion is provided with the elastic sheet, so that the strength of the waist opening portion and the foot opening portion can be improved. Moreover, in the absorbent article using a thin material such as a non-woven fabric, the plurality of members are joined, so that the first and second joint portions are made thicker than the other portions. However, the upper end portion of the belt portion is formed by folding the sheet member, and the elastic sheet is provided on the leg gather portion, so that the degree of color of the first and second joint portions can be made inconspicuous.

In the absorbent article, it is preferable that the first joining portion has a region in which the sheet member is located closer to the other side than the absorbent body in a state in which the belt portion has been extended in the lateral direction. area.

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

===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 pants-type state of 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 portion on the back side of the wearer.

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. Fig. 3B is a schematic cross-sectional view taken along line B-B of Fig. 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 flat 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 a direction corresponding to the longitudinal direction of the pants-type state of FIG. 1. However, the longitudinal direction of the pants-type state and the longitudinal direction of the plane state are somewhat different, and the two are different depending on the need. The area is divided into [the longitudinal direction of the pants-type state], the [longitudinal direction of the planar 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. When the contraction force by the member (rubber line) 33 is elongated in the longitudinal direction, the state is extended until the portion where the elastic members are disposed is substantially incapable of recognizing wrinkles, wrinkles, and the like. Further, the shape of the disposable diaper 1 in a state of being elongated in the longitudinal direction is the same as the shape of the disposable diaper 1 when the contraction force by the respective elastic members such as the rubber thread 23 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 shape of the absorbent main body 10 is only in a planar state, and the disposable diaper 1 is overcome by the elastic member 33. The contraction force is elongated in the longitudinal direction so that the shape of the absorbent body 10 coincides with the reference shape.

In the following description, the side of the abdomen side of the wearer is set in a state in which the absorbent main body 10 is extended in the longitudinal direction. The front side (abdominal side) in the longitudinal direction and the side abutting against the back side of the wearer are 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 in the flat state is a direction orthogonal to the longitudinal direction and the lateral direction, 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 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 gather portion 20 is provided with a foot gather notch portion 25 formed by cutting a part of the lateral outer end portion 20eo (the return line FL). Similarly, the belt portion 30 is provided with a belt notch portion 35 formed by cutting a part of the laterally outer end portion 30eo (the return line FL). 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 from the longitudinal direction front end portion 10ef toward the foot opening portion HL to the first joint portion WL1 and the absorbent body 10 (strictly speaking, the configuration of the absorbent body 10) The top sheet 13) on the skin side and the foot gather portion 20 are joined. same The belt portion 30 is joined to the absorbent body 10 and the foot gather portion 20 by the pair of the second joint portions WL2 which are inclined from the rear end portion 10er in the longitudinal direction 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 inner end portions 30ei, 30ei in the lateral direction of the pair of belt portions 30, 30 toward each other in the lateral direction, and folding the absorbent body 10 in the vicinity of the center position CL in the longitudinal direction, this can be achieved. The disposable diaper 1 in the flat state is formed in a state in which the pants 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. The absorbent 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 (equivalent to Non-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). In addition, as a coating pattern of an adhesive agent, an Ω pattern, a spiral pattern, a stripe pattern, etc. are mentioned, for example, the coating pattern of the adhesive agent mentioned here is the same with respect to the other adhesive agent which arises later.

The absorber 11 is provided with: a predetermined liquid absorbing material An absorbent core material formed into a predetermined shape (for example, a plane angle of view is a slightly hourglass bell shape); and a core material wrapping sheet covering the outer peripheral surface of the absorbent core material, used to absorb urine when the disposable diaper 1 is worn The components of the excretory fluid. Examples of the liquid absorbing material include liquid absorbing fibers such as pulp fibers, and liquid absorbing granular materials 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 plane view angle shown in FIG. 3A, which is a slightly hourglass shape, 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 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 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 protected. Hold the sheets 13, 15 between each other.

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 the nonwoven fabric are overlapped in the thickness direction. Further, the engagement between the absorbent body 10 and the foot gather portion 20 is sandwiched between the top sheet 13 and the back sheet 15 of the absorbent body 10 at the inner end portion in the lateral direction of the foot gather portion 20. 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 which is long in the longitudinal direction of both sides of the leg gathers 20 in the lateral direction, 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 which is 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 member 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 is formed to cross the return line FL Department HL. As described above, the foot opening portion HL is 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.

In the same manner, between the first sheet 31 and the second sheet 32 of the belt portion 30, 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 heated by heat. A melt adhesive or the like is fixed. 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 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 wider width in the lateral direction than the foot opening portion HL, and has an opening having the same shape as the foot opening portion HL, and is elongated in the longitudinal direction. In the state of being fixed to the sheets 41, 42 by a hot melt adhesive or the like. 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 planar elastic sheet 43 at the peripheral edge portion of the foot opening portion HL, the fit can be improved. Further, since the general disposable diaper 1 is made of a material having a light color such as a non-woven fabric, the degree of color of the first joined 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 degree of color of the first joint portion WL1 is made 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 thermally melted. The adhesive 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 the lateral inner end portion 30ei of the belt portion 30 in Fig. 2A, and is a portion that becomes 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 overlapped, and the loss can be reduced. The impression of similar underwear. However, the lateral end region may not necessarily be the above-described folded structure.

<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 substrate sheet of the disposable diaper 1 is used. The sheet member is an absorbent body continuous sheet 10A and a 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 with a foot gather notch portion 25 and a belt notch portion 35 as the foot opening portion HL at positions on the both sides in the CD direction (lateral direction) of the absorbent body 11 across the return line FL. (S102). The notch portion is formed using a cutting roller or the like (not shown). The state indicated by the process S102 of Fig. 4 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 are in the thickness direction. The state of being repeated (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 cut the molten region WU (described later) to form the leading end WLp1 of the first joining portion and the leading end WLp2 of the second joining portion. By cutting in 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 joining 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 joining portion WL2 is formed on the rear side in the front-rear direction, and is provided symmetrically with respect to the center line X-X. 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. In this case, the first joint portion WL1 is located at the outermost side of the first joint portion WLp1 located at the outermost side in the lateral direction and the first joint portion WL1 is located at the innermost side in the lateral direction. The base end WLb1 of the portion is substantially parallel.

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 end portion 30es. With this, even if the belt portion 30 is extended in the lateral direction by the rubber wire 33, 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, when the lower end of the first joining portion WL1 is formed to be separated from the foot opening portion HL by a predetermined distance (for example, 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 where the leg gather portion 20 formed in the pants type 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, whereby the first joined portion WL1 can be reduced.

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 row of the molten regions WU, and the first region of the molten regions WU and the first joining portion are formed. The front end WLp1 is preferably arranged in parallel with a plurality of columns. 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 the row arranged in the direction of the arrow R2 is a row on the side of the tip end WLp1 of the first joint 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 rows R2 of the molten regions WU on the front end WLp1 side can reduce the flaws in which the first joining portion WL1 is 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 from the melting. The distance from the center of gravity of the region WU to the center of gravity of the adjacent molten region WU. The rubber wire 33 has an elastic force that is pulled in the lateral direction at a portion where the rubber wire 33 is provided. However, since the elastic force of the rubber wire 33 acts as a distance between the rubber wires 33, the pitch of the molten region WU is made small, so that the rubber wire 33 can be further made 1 The joint strength of the joint portion WL1 is 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, it is preferable to shorten the L toward the waist opening portion HB. 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. This first The 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. Thereby, the first joining portion WL1 can be made inconspicuous, and the feeling of discomfort felt when the first joining portion WL1 comes into contact with the wearer's abdomen at the time of wearing can be reduced.

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 stretched 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 in which the rubber wire 33 of the belt portion 30 is stretched in the lateral direction until the wrinkles and wrinkles are not recognized, the state is contracted by 48 to 78% (preferably, the state is 63% contraction).

8A is a schematic cross-sectional view of a CC cross section of FIG. 7, FIG. 8B is a schematic cross-sectional view of the DD cross-section of FIG. 7, FIG. 8C is a schematic cross-sectional view of the EE cross-section of FIG. 7, and FIG. 8D is a schematic cross-sectional view of the FF cross-section of FIG. Figure. 8A is a cross-sectional view of a portion where the absorbent main body 10 and the folded portion FLB of the belt portion 30 are joined to each other in the first joint portion WL1, and is displayed above 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 WL1 can be further reduced, and the impression of the similar panties of the pants-type diaper 1 having the damaged joint portion provided on the front side of the abdomen side can be reduced. In the state in which the front end WLp1 of the first joining portion and the front end of the first overlapping region LA1 are formed at the same position in the state in which the belt portion 30 is extended in the lateral direction, the general shorts type paper of FIG. Similarly, the diaper 1 is in a state in which 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.

Further, as shown in FIG. 8A and FIG. 8B, in the first joining portion WL1, the absorbent main body 10 is joined to the belt portion 30, the absorbent main body 10 is located on one side in the front-rear direction, and the sheet member 40 is compared with the absorbent body. 10 is better located closer to the other side. 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.

With this, it is possible to reduce the discomfort of the wearer who feels unevenness or the like, or to reduce the visibility of the first joint portion WL1 that protrudes from the clothes worn on the disposable diaper, and the like. 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 joining portion WL1 joining the belt portion 30 and the absorbent body 10 to the lower side of the folded portion FLB in FIG. 8B and the adjacent sheet member 40 is preferably smaller than 45 degrees. Thereby, the first joint portion WL1 can be made more conspicuous.

8C, the angle θ3 between the first joint portion WL1 joining the leg gather portion 20 and the belt portion 30 and the adjacent sheet member 40, and the first step of joining the foot gather portion 20 and the belt portion 30 in FIG. 8D The angle θ4 formed by the joint portion WL1 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 θ4 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 rubber of the foot gather portion 20 is not provided. The line 23 is provided closer to the vicinity of the FF cross section than the rubber line 33 of the belt portion 30, so that the first joint portion WL1 is affected by the pulling force of the rubber thread 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 panty 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. Moreover, it is easy to recognize the boundary between the leg gathers 20 and the belt portion 30, and it can be used as a mark which is a support portion for pulling up the disposable diaper 1 at the time of wearing.

===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 can be formed into a circle Various shapes such as a shape and a quadrangle may be provided in a plurality of rod-shaped molten regions parallel to the front end WLp1 of the first joint portion and the front end WLp2 of the second joint portion.

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 that is easily noticeable, it is possible to give the wearer an impression of similar 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

30ei‧‧‧lateral inner end

30es‧‧‧ transverse section of the belt

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 (10)

An absorbent article having 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 overlapping region in which the absorbent body and the sheet member overlap each other And the second overlapping region is provided on one side and the other side in the front-rear direction, wherein the first overlapping region and the second overlapping region are in the longitudinal direction, and the waist opening portion side faces the foot opening portion The outer side of the lateral direction is inclined, and at least the absorbent main body and the sheet member are joined to each other in the first joining portion, and at least the absorbent main body and the sheet member are joined at the second joining region in the second overlapping region. The front portion is joined, and the front end of the first joint portion is formed at the same position as the front end of the first overlap region. The absorbent article according to claim 1, wherein the front end of the second joining portion is formed at the same position as the front end of the second overlapping region. Such as the absorbent article of claim 1 or 2, wherein In the first joining portion and the second joining portion, the absorbent body and the sheet member are joined by a plurality of molten regions. The absorbent article according to claim 3, wherein the plurality of the molten regions in the first joining portion are formed in parallel with the front end of the first overlapping region, and the plurality of the second joining portions are the plurality of The molten region is formed in a row parallel to the front end of the second overlapping region, and two or more of the above-described columns are provided. The absorbent article according to claim 3, wherein the sheet member has a first elastic member and a second elastic member, and an end portion of the first elastic member has a portion overlapping the molten region, and the second elastic portion The ends of the members are located between adjacent aforesaid molten regions. The absorbent article according to claim 5, wherein the first elastic member and the second elastic member are rubber threads, and the first joining portion and the second joining portion are adjacent to each other in the longitudinal direction. The interval between the molten regions is smaller than the interval between the adjacent rubber wires. The absorbent article according to claim 1 or 2, wherein the distance from the base end to the tip end of the first joining portion is closer to the end portion of the first joining portion on the side of the waist opening portion side The shorter the side of the waist opening, In the end portion of the second joint portion on the side of the waist opening portion, the distance from the base end to the tip end of the second joint portion is shorter toward the side of the waist opening portion. The absorbent article according to claim 1 or 2, wherein the lower end of the first joining portion and the lower end of the second joining portion are separated from the foot opening portion by a predetermined distance. The absorbent article according to claim 1 or 2, wherein the upper end portion of the belt portion is formed by folding back the sheet member, and the foot gather portion is provided with an elastic member that can expand and contract in the longitudinal direction. The absorbent article according to claim 1 or 2, wherein, in the state in which the belt portion has been extended in the lateral direction, the first joining portion has the sheet member located closer to the absorbent body. The area on the other side of the foregoing.