TWI576100B - Absorbent items - Google Patents

Description

Absorbent article

The present invention relates to an absorbent article and a method for producing an absorbent article in which an elastic member is disposed in an extended state between two sheets.

Patent Document 1 discloses an absorbent article in which an elastic member after stretching is provided around a leg opening portion. In the method for producing an absorbent article, the elastic member is disposed on the sheet in an extended state such that the leg elastic member on the left side of the absorbent article and the leg elastic member on the right side are continuous, and the leg elasticity of the left side is cut. An unnecessary elastic member between the member and the right leg elastic member. In the absorbent article thus produced, the left leg elastic member and the right leg elastic member are disposed discontinuously.

As described above, in the related art, a continuous elastic member is disposed in a stretched state on the sheet material, and a part of the elastic member is cut, whereby the elastic member is provided only in a necessary portion (for example, around the leg opening portion).

[Advanced technical literature] [Patent Literature]

[Patent Document 1] US Patent Publication No. 6482278

However, the above absorbent article has the following problems.

If the elastic member is to be disposed in an extended state and the elastic member is continuously cut in the manufacturing process, the elastic member is discontinuously disposed, and when the elastic member is cut, the stretched state of the elastic member of the cut portion is released and contracted. . Therefore, the end portion of the elastic member moves toward the inner side in the extending direction from the cutting position. When the amount of movement of the end portion of the elastic member is increased, the elastic member is not disposed in the vicinity of the cut portion, and the sheet material or the like in the vicinity of the cut portion cannot be shrunk.

For example, in order to shrink a sheet or the like in the vicinity of the cut portion, it is conceivable to apply an adhesive to the elastic member of the cut portion or the cut portion of the sheet. However, when an adhesive is applied to the elastic member or the like in the cut portion, the adhesive is exposed from the cut portion. When the adhesive is exposed from the cut portion, the sheet material is joined to each other at an unintentional portion, or the adhesive adheres to the wearer to cause a skin problem.

Moreover, in order to shrink the sheet material or the like in the vicinity of the cut portion, it is conceivable to increase the basis weight of the adhesive for joining the elastic member and the sheet member as a whole to suppress separation and movement of the elastic member from the sheet member. However, if the basis weight of the adhesive is excessively increased as a whole, the softness of the sheet material is lowered to cause a strange feeling when worn, or to be difficult to adhere to the body.

Accordingly, it is an object of the present invention to provide an absorbent article and a method of producing an absorbent article which are attached to two sheets of thin An elastic member in an extended state is disposed between the sheets to shrink the sheet by the elastic member, and the area intended for the sheet is contracted by the elastic member while maintaining the flexibility of the sheet.

The absorbent article (disposable disposable diaper 1) of the present invention has an absorbent body (absorbent body 40) having a front-rear direction (front-rear direction L) extending toward the front side and the rear side of the wearer, and the front-rear direction The orthogonal width direction (width direction W), the inner direction of the wearer (inner direction IN), and the outer direction (outer direction OUT) opposite to the inner direction; a plurality of sheets are disposed in The inner direction or the outer direction is greater than the absorbent body; and the elastic member (the front leg elastic material 5F or the rear leg elastic material 5R) is stretched in at least one of the front-rear direction and the width direction. The first sheet (the front outer top sheet 70F or the rear outer top sheet 70R) and the second sheet (the front outer back sheet 80F or the rear outer back sheet) included in the plurality of sheets are disposed. Between 80R), a first contiguous region (first contiguous region R1) is provided between the first sheet member and the second sheet member, and at least a region in which the elastic member is disposed is provided, and an adhesive is applied; And the second subsequent region (the second subsequent region R 2) is disposed in a portion overlapping with the first subsequent region, and is coated with an adhesive, and has a contraction region (contraction region R5), and at least the first sheet and the second portion of the plurality of sheets The sheet material is shrunk by the elastic member in the stretched state; and the non-shrinking region (non-shrinking region) R6), in the contraction direction of the contraction region, adjacent to the contraction region, and the first sheet material and the second sheet material are not shrunk by the elastic member, and the first and second subsequent regions are in the second and subsequent regions. The overlapped region (overlap region R4) is disposed at the end portion of the contraction region on the non-shrinkage region side, and the first sheet member or the second sheet member is laminated so as to overlap the overlap region. Sheet material (outer center sheet 100).

In the method for producing an absorbent article of the present invention, the absorbent article includes an absorbent body having a front-rear direction extending toward the front side and the rear side of the wearer, and a width direction orthogonal to the front-rear direction, and facing the wearer. The inner direction of the user and the outer direction opposite to the inner direction; the plurality of sheets are disposed in the inner direction or the outer direction than the absorber; and the elastic member is oriented in the front-rear direction And a state in which at least one of the width directions is extended between the first sheet material and the second sheet material included in the plurality of sheets; and the method for producing the absorbent article is intended to include: a process of providing a first bonding region by applying an adhesive to at least one of the surface of the sheet member on the side of the elastic member side and the surface of the second sheet member on the side of the elastic member; The first sheet material of at least one of the surface of the first sheet member on the elastic member side and the surface of the second sheet member on the elastic member side The end portion of the second sheet material is coated with an adhesive agent so that at least a portion thereof overlaps with the first succeeding region, and a process of the second succeeding region is provided; and the first sheet material and the second sheet material are overlapped Area, and the aforementioned a process in which the end portion of the sheet material is further outside or a region outside the end portion of the second sheet material, and the elastic member is stretched and disposed; and is disposed at an end portion of the first sheet material The elastic member in the region outside the end portion of the second sheet material is cut along the end portion of the first sheet material or the end portion of the second sheet material.

Moreover, the absorbent article (disposable disposable diaper 1) of the present invention includes an absorbent main body having a front-rear direction extending toward the front side and the rear side of the wearer, and a width direction and orientation orthogonal to the front-rear direction. The inner direction of the wearer and the outer direction opposite to the inner direction; and the outer body are disposed outside the absorbent body; and the inner wearer is disposed between the wearer's a lower region of the lower portion, a front abdominal region disposed in front of the crotch region, and a rear abdominal region disposed behind the crotch region, the absorbent body having a pair of curved portions, the pair of curved portions being located The center of the width direction of the absorber is further outward in the width direction, and the absorber is formed to be convex in a convex shape in the outer direction, and a plurality of elastic members are disposed in the exterior body, and the plurality of elastic members have a straight line The portion is formed in a linear shape extending in the width direction; and the curved portion is located on the outer side in the width direction of the straight portion, and is formed from the width a curved shape in which the inner side faces the outer side in the width direction and extends outward in the front-rear direction from the inner side in the front-rear direction, and the linear portion of the elastic member overlaps the pair of curved portions of the absorber, and the curved portion of the elastic member is disposed more than the aforementioned The absorber is further outward in the width direction, and the stretch ratio of the curved portion of the elastic member is higher than the stretch ratio of the straight portion of the elastic member.

According to the present disclosure, it is possible to provide an absorbent article in which an elastic member in an extended state is disposed between two sheets to shrink a sheet by an elastic member while holding a sheet, and an absorbent article. The softness of the material shrinks the intended area of the sheet by the elastic member.

1‧‧‧Disposable disposable diapers (absorbent articles)

3‧‧‧ Waist wrinkles

3A‧‧‧ waist elastic material

4,4’‧‧‧ front abdominal circumference

5‧‧‧ leg wrinkles

5F‧‧‧Front leg elastic material

5R‧‧‧ rear leg elastic material

6,6’‧‧‧After abdominal margin

7‧‧‧ abdominal wrinkles

7A‧‧‧ belly elastic material

10‧‧‧Surface

15‧‧‧Second sheet

30‧‧‧Fabric sheets inside the absorber

32‧‧‧Leak-proof side sheet

33‧‧‧Leakproof elastic material

40‧‧‧ absorber

41‧‧‧1st floor

41W‧‧‧Inside end

42‧‧‧2nd floor

42W‧‧‧Outer end

43‧‧‧Adhesive coated sheets

44‧‧‧Central elastic material

45‧‧‧Central gap

46‧‧‧ side gap

47‧‧‧Squeeze Department

51‧‧‧ front end

52‧‧‧ Straight line

53‧‧‧ Curve Department

70F‧‧‧ front side outer sheet

70R‧‧‧ rear side outer top sheet

80F‧‧‧ front side outer back sheet

80R‧‧‧ rear side outer back sheet

100‧‧‧Outer center sheet

S1‧‧‧ front abdominal area

S2‧‧‧After abdominal area

S3‧‧‧胯下区

R1‧‧‧1st continuation area

R2‧‧‧2nd continuation area

R3‧‧‧ Center followed by area

R4‧‧‧ overlapping area

R5‧‧‧ contraction area

R6‧‧‧ non-shrink area

R7‧‧‧Auxiliary sheet follower area

Fig. 1 is a schematic perspective view of a disposable diaper according to a first embodiment.

Fig. 2 is a developed plan view of the disposable disposable diaper of the first embodiment.

Fig. 3 is a cross-sectional view in the width direction of the disposable diaper along the line X1-X'1 shown in Fig. 2.

Fig. 4 is a front-rear cross-sectional view of the disposable diaper along the line X2-X'2 shown in Fig. 2.

Fig. 5 is a plan view of the absorber of the first embodiment.

Fig. 6 is a cross-sectional view schematically showing a deformed state of the disposable diaper of the first embodiment along the line X1-X'1.

Fig. 7 is a view schematically showing a manufacturing process of the absorbent article according to the first embodiment along the conveyance direction of the method for producing an absorbent article.

Fig. 8 is a schematic view showing a first succeeding region and a second succeeding region.

Fig. 9 is a schematic cross-sectional view of the exterior body taken along the line X3-X'3 shown in Fig. 2.

Fig. 10 is a developed plan view of the disposable diaper of Modification 1.

Fig. 11 is a schematic cross-sectional view of the exterior body taken along the line X4-X'4 shown in Fig. 10.

Fig. 12 is a schematic cross-sectional view showing the exterior body of the disposable diaper of Modification 2.

Fig. 13 is a developed plan view of the disposable diaper of Modification 3.

Fig. 14 is a schematic cross-sectional view showing the X3-X'3 line shown in Fig. 2 of the disposable diaper of Modification 4.

Fig. 15 is a schematic cross-sectional view showing the X3-X'3 line shown in Fig. 2 of the disposable diaper of Modification 5.

Fig. 16 is a developed plan view of the disposable diaper of Modification 6.

Fig. 17 is a cross-sectional view of the disposable diaper of Modification 6 taken along the line X5-X'5 and X6 in an extended state.

Figure 18 is a cross-sectional view of the disposable diaper of Modification 6 in a natural state along the line X5-X'5 and X6.

Fig. 19 is a developed plan view of the disposable diaper of Modification 7.

Next, the disposable diaper 1 as an absorbent article of the embodiment will be described with reference to the drawings. In the following description, the same or similar components are attached to the same or similar parts. However, the drawing is a schematic diagram, and it should be noted that the ratio of each size is different from the actual one. Therefore, the specific dimensions and the like should be judged by considering the following description. Further, the drawings may include portions having different dimensional relationships or ratios from each other.

(1) The overall outline of the disposable paper diaper

Fig. 1 is a schematic perspective view of a disposable diaper 1 constituting the disposable diaper of the present embodiment. Fig. 2 is a developed plan view of the disposable disposable diaper 1 of the present embodiment. Fig. 3 is a cross-sectional view in the width direction of the disposable diaper 1 taken along the line X1-X'1 shown in Fig. 2 . Fig. 4 is a front and rear cross-sectional view of the disposable disposable diaper 1 taken along the line X2-X'2 shown in Fig. 2. Disposable disposable diaper 1 type pants type disposable paper diaper.

The disposable diaper 1 has a front-back direction L extending toward the wearer's front side and the body rear side, a width direction W orthogonal to the front-rear direction L, an inner direction IN toward the wearer, and a direction opposite to the inner direction. The thickness direction T of the outer direction OUT of the side.

As shown in Fig. 2, the disposable diaper 1 is attached to the disposable diaper 1 in the front-rear direction before the wearer's front abdominal circumference S1 and the wearer's rear abdominal circumference. The surrounding area S2 and the underarm area S3 which is placed under the armpit of the wearer and located between the front abdominal area S1 and the rear abdominal area S2.

The front abdominal region S1 is located on the outer side in the width direction W, and the abdominal margin portion 4 and the rear abdominal region S2 are located on the outer side in the width direction W, and the abdominal margin portion 6 is joined, and the front abdominal peripheral portion 4' and the rear abdomen The peripheral edge portion 6' is joined to form the disposable disposable diaper 1 into a pants type. In the front abdominal region and the rear abdominal region of the pants-type disposable disposable diaper, the joint portion 11 that joins the edge portions of each other is formed, and the underarm region S3 is more forward and backward than the joint portion 11. The area inside the direction.

As shown in Fig. 1, in the state in which the disposable disposable diaper 1 is formed into a pants type, one of the waist opening portion 8 disposed around the waist of the wearer and the leg circumference surrounding the wearer is formed. The leg opening portion 9 is provided.

The disposable disposable diaper 1 is composed of a surface sheet 10, an absorbent main body 1A including the absorbent body 40 and the absorbent back sheet 30, a front outer top sheet 70F, a rear outer top sheet 70R, and an outer back sheet 80. The outer casing 1B is configured to be joined to each other by an adhesive, heat welding or the like.

The exterior body 1B includes a front outer top sheet 70F and a rear outer top sheet 70R as outer top sheets, a front outer back sheet 80F as an outer back sheet, and a rear outer back sheet 80R, and outer The center sheet 100 is mounted to constitute an exterior portion of the disposable diaper 1. The exterior body 1B is located in the outer direction OUT of the absorbent main body 1A containing the absorber 40, and is arrange|positioned on the non-skin contact side of a disposable diaper.

The front outer top sheet 70F is disposed to span the front abdominal region S1 and the underarm region S3. The rear exterior top sheet 70R is disposed to span the rear abdominal region S2 and the underarm region S3. The front outer top sheet 70F and the rear outer top sheet 70R are disposed apart from each other in the front-rear direction, and are disposed between the front outer back sheet 80F or the rear outer back sheet 80R and the absorbent main body 1A in the thickness direction.

The front outer top sheet 70F and the rear outer top sheet 70R may be formed by a hot air non-woven fabric, a spunbonded nonwoven fabric, an SMS non-woven fabric, a waterproof film, or the like. In the present embodiment, the front outer top sheet 70F and the rear outer top sheet 70R are formed of an SMS nonwoven fabric having a basis weight of 15 g/m ^{2 made} of polypropylene.

The front outer back sheet 80F and the rear outer back sheet 80R are located on the outer side when worn, that is, on the side separated from the wearer's skin. The front outer back sheet 80F is disposed to span the front abdominal region S1 and the underarm region S3. The rear exterior back sheet 80R is disposed to span the rear abdominal region S2 and the underarm region S3. The front outer back sheet 80F and the rear outer back sheet 80R are disposed apart from each other in the front-rear direction. The front end portion of the front outer cover sheet 80F and the rear end portion of the rear outer cover back sheet 80R are disposed so as to be folded back on the skin contact surface side, and wrap the front end portion and the rear side outer top sheet of the front outer top sheet 70F. The rear end of the 70R. The front outer top sheet and the front outer back sheet constitute a front outer casing, and the rear outer top sheet and the rear outer back sheet constitute a rear outer casing.

The outer back sheet can be formed by a hot air non-woven fabric, a spunbonded non-woven fabric, an SMS non-woven fabric, a waterproof film, or the like. In the present embodiment, the back sheet was formed of a spunbonded nonwoven fabric having a basis weight of 18 g/m ^{2 made} of polypropylene.

The exterior center sheet 100 connects the front outer casing and the rear outer casing. Specifically, the exterior center sheet 100 is located at the rear end portion of the front outer top sheet 70F and the front outer back sheet 80F, and the rear outer top sheet 70R and the rear outer back sheet 80R in the front-rear direction. Between the front end portions; in the thickness direction, the front side outer top sheet 70F, It is disposed between the absorbent inner sheet 30 or the elastic material covering sheet 43 and between the rear outer top sheet 70R, the absorbent inner sheet 30, and the elastic material covering sheet 43. A part of the exterior center sheet 100 is configured to be disposed in an overlapping area to be described later, and functions as a third sheet.

By providing the exterior center sheet 100, the front outer top sheet 70F and the front outer back sheet 80F, and the rear outer top sheet 70R and the rear outer back sheet 80R can be connected. Therefore, in the form in which the exterior top sheet and the exterior back sheet are separated in the front-rear direction, the absorbent main body 1A can be prevented from being exposed. Further, in the manufacturing process, the leg-opening portion may be formed or joined to the absorbent main body 1A in a state in which the front outer casing and the rear outer casing are separated from each other.

The exterior center sheet 100 can be formed by a hot air non-woven fabric, a spunbonded nonwoven fabric, an SMS non-woven fabric, a waterproof film, or the like. In the present embodiment, the outer center sheet 100 is formed of a spunbonded nonwoven fabric having a basis weight of 19 g/m ^{2 made} of polypropylene.

The absorbent main body 1A includes the surface sheet 10, the second sheet 15, the inner sheet of the absorbent body, and the leakage preventing portion, and is disposed closer to the wearer side than the outer casing 1B.

The surface sheet 10 is a sheet which can directly contact the skin of the wearer to form a skin abutting surface. The surface sheet 10 is disposed on the skin contact surface side of the absorber 40. The surface sheet 10 is formed of a liquid permeable sheet such as a hydrophilic nonwoven fabric or a woven fabric, an open plastic film, or an open hydrophobic nonwoven fabric. The surface sheet 10 of the present embodiment is formed of a hydrophilic spunbonded nonwoven fabric having a basis weight of 23 g/m ^{2 made} of polypropylene.

The second sheet 15 is joined to the non-skin contact surface side of the surface sheet 10. The second sheet 15 is disposed between the surface sheet 10 and the absorber 40. By providing the second sheet 15, the absorption rate of the body fluid can be made rapid, and the backflow of the body fluid after absorption can be suppressed.

The second sheet 15 is, for example, a hot air non-woven fabric, an apertured film, or the like. The second sheet 15 of the present embodiment is formed of a hot air non-woven fabric (hydrophilic) having a basis weight of 30 g/m ² . The surface sheet 10 and the second sheet 15 are joined by an adhesive.

The absorber 40 is bonded between the composite sheet to which the surface sheet 10 and the second sheet 15 are bonded, and the sheet 30 for the absorber, and is joined by a hot melt type adhesive. The hot-melt type adhesive is applied to the composite sheet and the inner sheet, respectively, and is applied by, for example, a spiral coating method at a basis weight of 5 g/m ² and 8 g/m ² , respectively.

The absorber 40 is formed of a mixed powder of pulverized pulp or a superabsorbent polymer. The absorber 40 is composed of a first layer 41 which is located on the non-skin contact surface side of the wearer, and a second layer 42 which is overlapped with the first layer 41 and is placed for wearing. The skin of the person is in contact with the face (see Figure 5).

The first layer 41 is formed with a center slit 45 and a side slit 46 that extend in the front-rear direction. The center slit 45 is formed at the center in the width direction of the first layer 41, and the side slits 46 are formed on both outer sides in the width direction of the center slit 45.

The disposable diaper 1 has a central elastic member 44 that is disposed to overlap the central slit 45. By virtue of the elasticity formed in the absorber 40 The material, the slit, and the like constitute a structure in which the absorbent body 40 is bent when the disposable disposable diaper 1 is worn. In the present embodiment, the central elastic member 44 and the center slit 45 constitute a curved portion which is formed so that the absorbent body can be curved in a convex shape in the inward direction. Further, the side slit 46 is formed such that the absorber can be curved in a convex shape in the outward direction. Further, the structure of the absorber will be described in detail later.

The absorber inner sheet 30 is provided on the non-skin contact surface side of the absorber 40. The sheet 30 inside the absorber is formed by a liquid-impermeable film or the like (for example, polyethylene) sheet. The absorber inner sheet 30 is disposed in the outer direction OUT of the absorber, and is liquid-impermeable. The absorber inner sheet 30 is disposed to extend outward in the front-rear direction from the absorber 40.

The leakage preventing portion has the leakage preventing side sheet 32 and the leakage preventing elastic member 33, and is disposed in the front-rear direction at the end portion in the width direction of the absorbent body 40. The leakage preventing side sheets 32 are provided at both side ends of the absorbent body 40 in the width direction W, and are provided to integrally wrap the surface sheet 10 and the absorbent inner sheet 30. The leakage preventing side sheet 32 is formed of a sheet such as a liquid-impermeable nonwoven fabric. One end portion in the width direction of the leakage preventing side sheet 32 is joined to the surface on the non-skin side of the sheet 30 of the absorbent body, and the other end portion in the width direction of the leakage preventing sheet 32 is from the width of the absorbent body 40. The direction side portion is folded back to the surface sheet side, and joined to the surface of the surface sheet 10 on the skin contact surface side.

The leakage preventing side sheet 32 is joined to a surface sheet or the like by a hot melt adhesive. In this embodiment, a plurality of hot-melt type adhesives are actually applied by a bead coating at a basis weight of 0.1/m ² . Further, the leakage preventing side sheet 32 is composed of a hydrophobic nonwoven sheet, and the present embodiment is constituted by an SMS nonwoven fabric having a basis weight of 15 g/m ² of polypropylene.

The leakage preventing elastic member 33 is attached between the absorbent inner sheet 30 and the leakage preventing side sheet 32, and is bonded in a state of being stretched in the front-rear direction. The leakage preventing elastic member 33 shrinks both end portions in the width direction of the absorbent body in the front-rear direction. As a fixing means of the leakage preventing elastic material, a hot-melt type adhesive can be exemplified. In the present embodiment, an elastic fiber is used as the leakage preventing elastic member 33, and is directly applied by a V-shaped slit method. More specifically, the leakage preventing elastic member 33 is stretched and fixed at a stretch ratio of 780 dtex and a stretch ratio of 2.3 times.

The leakage preventing elastic member 33 is disposed so as to be substantially connected to the leg wrinkles described later in plan view. By disposing the leakage preventing elastic material and the leg wrinkles in this manner, the leg circumference of the wearer can be tightened to improve the conformability of the leg circumference, and the disposable paper diaper can be prevented from shifting or leaking. The effect.

A waist wrinkle 3 and a web wrinkle 7 are provided in the front abdominal region S1 and the rear abdominal region S2. The waist wrinkle 3 and the abdominal wrinkle 7 have an elongated waist elastic material 3A such as synthetic rubber and an abdominal elastic material 7A, and are disposed to be expandable and contractible along the width direction W of the absorbent body 40. The waist elastic material 3A and the abdominal elastic material 7A are joined to the front outer top sheet 70F and the front outer back side by an adhesive (for example, a hot melt adhesive) in a state in which the disposable diaper 1 is stretched in the width direction W. The sheet 80F and the rear side outer top sheet 70R and the rear side outer back sheet 80R are interposed.

The waist wrinkle 3 and the abdominal wrinkle 7 are continuous from the front abdominal margin portion 4 on the one side of the outer side in the width direction W of the absorbent article 1 in the front abdominal region S1 to the front abdominal peripheral edge portion 4 on the other side. 'From the rear abdominal region S2, the rear abdominal peripheral edge portion 6 on the one side of the outer side in the width direction W of the absorbent article 1 is continuous to the rear abdominal peripheral edge portion 6' on the other side.

A leg gather 5 is provided around the leg opening portion 9. The leg wrinkles are formed by an elongated leg-surrounding elastic material such as a stretchable synthetic rubber. The leg-surrounding elastic material is composed of a front leg elastic material 5F disposed in the front abdominal region S1 and a rear leg elastic material 5R disposed in the rear abdominal region S2. The leg gathers 5 are arranged so as not to straddle the absorber 40.

The leg-surrounding elastic material is joined between the front-side exterior top sheet 70F and the front-side exterior back sheet 80F, and the rear-side exterior top sheet 70R and the rear-side exterior back sheet 80R. The front outer top sheet 70F and the front outer back sheet 80F are arranged to sandwich the first sheet and the second sheet of the front leg elastic material 5F as the elastic member, and the rear side outer sheet 70R and the rear side. The exterior back sheet 80R is disposed so as to sandwich the first sheet member and the second sheet member of the hind leg surrounding elastic member 5R as the elastic member.

By disposing the waist wrinkles 3, the abdominal wrinkles 7 and the leg wrinkles 5, the disposable paper diapers can be held by the waist, and the disposable disposable diapers can be prevented from sagging.

In the waist elastic material of the present embodiment, the front abdominal region S1 and the rear abdominal region S2 are stretched and fixed at a stretch ratio of 940 dtex and a stretch ratio of 3.5 times. Further, the abdominal elastic material was stretched and fixed at a thickness of 780 dtex and a stretching ratio of 3.0 times. The fixing means of the waist elastic material and the abdominal elastic material can be, for example, a hot melt type adhesive. In the present embodiment, the hot-melt type adhesive is directly applied to the elastic material by a V-shaped slit method.

The leg-surrounding elastic material of the present embodiment is stretched and fixed at a stretch ratio of 780 dtex and a stretch ratio of 1.5 to 3.5 times. Leg elastic material It is arranged in a state in which each part is formed to have a magnification gradient.

The leg-surrounding elastic material is a first contact region R1 (see FIG. 8) that is disposed at least in a region in which the leg-surrounding elastic material is disposed, and a second succeeding region R2 that is partially overlapped with the first succeeding region, and is joined to the outer casing. Between the top sheet and the outer back sheet. The joining method of the leg-surrounding elastic material will be described in detail later.

The central elastic member 44 is provided at a position overlapping the center slit 45 in the thickness direction T. The central elastic material 44 is convex in the inward direction IN, and is formed so as to overlap the absorber 40 in the front-rear direction even if the absorber 40 is curved convexly toward the wearer. Since the central elastic member 44 is disposed to overlap the center slit 45, the center slit 45 can be more stably bent upward (on the wearer side). The central elastic material 44 is disposed in an extended state in the center in the width direction of the absorbent article in the front-rear direction. The central elastic material 44 is disposed in the crotch region S3.

The central elastic member 44 is disposed between the elastic material covering sheet 43 and the absorbent inner sheet 30 in an extended state. The central elastic material 44 is disposed at a stretching ratio of 1.4 to 3.0 times.

In the elastic fiber of the thickness of 620 dtex of the center elastic material of the present embodiment, seven elastic fibers are stretched and fixed at a stretching ratio of 2.0 times. The central elastic material has a spacing of 5 mm and a total joint length of 120 mm.

The elastic material covering sheet 43 is formed of a sheet such as a non-woven fabric, and functions as a sheet member that is disposed as an elastic member in an outer direction of the center elastic material. In the present embodiment, a spunbonded nonwoven fabric (hydrophobic) having a basis weight of 15 g/m ² made of polypropylene was used.

Examples of the material of the central elastic material 44 include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and chloroprene, natural rubber, EVA, stretchable polyolefin, elastic fiber, and foaming. Polyurethane and the like. In addition, as the material of the central elastic material 44, an elastomer fiber such as a mixed urethane type or polystyrene type, and a thermoplastic fiber such as a stretchable polyolefin type or a polyester type may be used, and by applying An elastic sheet such as a stretchable nonwoven fabric formed by stretching.

In addition, as the member constituting the disposable diaper 1, for example, a material described in JP-A-2006-346439 can be used.

(2) Structure of the absorber

Fig. 5 is a plan view of the absorber 40. As shown in Fig. 5, the absorber 40 has a first layer 41 and a second layer 42 that overlaps with the first layer 41. The first layer 41 is located on the non-skin contact surface side of the wearer, and the second layer 42 is located on the wearer's skin contact surface side.

The length of the first layer 41 in the front-rear direction is longer than the length of the second layer 42 in the front-rear direction. The first layer 41 is disposed so as to straddle the posterior abdominal region S2, the crotch region S3, and the front abdominal region S1, and the second layer 42 is disposed to straddle the crotch region S3 and the front abdominal region S1. The length of the second layer 42 in the width direction is shorter than the length of the first layer 41 in the width direction. The first layer 41 protrudes outward in the width direction from the second layer 42.

The first layer 41 and the second layer 42 are composed of a cotton pulp and a polymer absorbent polymer (SAP).

The first layer 41 can be formed, for example, by mixing 100 to 500 g/m ^{2 of} pulp and 20 to 500 g/m ^{2 of} SAP. Aspect of this embodiment the first layer 41, the pulp-based 280g / m ² and SAP170g / m ² formed by mixing.

A center slit 45 and a pair of side slits 46 are formed in the first layer 41. The center slit 45 is formed in the center portion in the width direction W. The length of the center slit 45 in the front-rear direction is longer than the length of the side slit 46 in the front-rear direction. In the present embodiment, the width of the center slit is 40 mm, and the width of the side slits 46 is 10 mm each.

Second layer 42 can, for example, pulp 100 ~ 500g / m ² and SAP0 ~ 500g / m ² formed by mixing. Based layer 42 of the present embodiment of the second aspect of the pulp 260g / m ² and SAP160g / m ² formed by mixing.

The second layer 42 is in the shape of an hourglass. The length of the center portion in the front-rear direction of the second layer 42 in the width direction is formed into a short narrow portion 42N. The outer end portion of the narrow portion 42N and the inner end portion of the side slit 46 are identical. According to this configuration, the rigidity difference of the absorber 40 can be formed at the end portion in the width direction of the side slit 46, and the absorber can be stably bent with the side slit 46 as a base point.

Further, by attaching and fixing the surface sheet 10 and the sheet 3 of the absorbent body in the side slits 46, the absorber can be bent and the outer shape can be prevented from being aliased.

Further, as shown in Fig. 2, the end portion of the second sheet 15 is located further inside than the side slit in the width direction. The rigidity of the region in which the second sheet 15 is disposed and the region in which the second sheet 15 is not disposed (the region on the outer side in the width direction from the end portion in the width direction of the second sheet 15) are different. By providing the difference in rigidity due to the presence or absence of the second sheet, it is easier to bend with the side bent portion composed of the side slits 46 as a base point.

Further, by forming the center slit 45, the central portion of the absorber 40 can be easily bent into a convex shape toward the wearer side, that is, the inner direction IN. The side slits 46 are formed on the outer side in the width direction than the center slits 45. The side slit 46 has an elongated shape extending in the front-rear direction. The pair of side slits 46 are convex in the outward direction OUT, and are formed in the absorber 40 along the front-rear direction even if the absorber 40 is curved in a convex shape opposite to the center slit 45.

In the crotch region S3, the outer end portion 42W in the width direction of the second layer 42 overlaps the inner end portion 41W of the side slit 46 of the first layer, and is disposed along the front-rear direction. The outer side end portion 42W of the second layer 42 is formed only by the first layer 41 on the outer side in the width direction, and the portion in which the center slit 45 is formed is removed from the outer end portion 42W, and the first layer 41 and The second layer 42 is constructed. Therefore, the inner end portion 41W of the first layer 41 and the outer end portion 42W of the second layer 42 are used as a boundary to change the rigidity and thickness of the absorber 40. In the present embodiment, the outer end portion 42W of the second layer which changes in rigidity or the like is used as a boundary to bend the absorber.

(3) Shape change of the absorber

Fig. 6 is a cross-sectional view schematically showing the wearing state of the disposable diaper 1 (based on the line X1-X'1 in Fig. 1). When the disposable diaper 1 is worn, the crotch region S3 of the absorbent body abuts against the wearer's crotch. By the wearer's leg or the like, the absorber is applied from the width direction to the outside The force to the inside of the width direction. In the absorber 40, the absorber 40 is bent by the center elastic material 44, the center slit 45, and the side slit 46 as a base point, and the cross-sectional shape of the disposable diaper 1 in the width direction W is wave-shaped. Therefore, the crotch region S3 of the absorber 40 becomes a regularly folded state.

The absorber 40 is in contact with the top surface of the wearer's crotch portion by the top surface of the absorber 40 which is convex in the inward direction IN by the central elastic material 44. The portion where the convex portion formed by the curved portion is formed is formed only by the second layer 42 and has a small thickness. On the other hand, between the convex portion formed by the curved portion and the convex portion formed by the side slit, the first layer 41 and the second layer 42 are overlapped, and the thickness is thick and the rigidity is high. The convex portion formed by the curved portion can be supported by the portion having high rigidity between the curved portion and the side slit, so that the stability of the convex shape formed by the curved portion can be improved.

Further, when the wearer's legs are closed, the cross-sectional shape of the disposable disposable diaper 1 is such that the absorbent body is folded in the curved portion and the side slit, and is placed in a state of being close to each other in a state of being closely attached to each other.

At this time, the curved portion formed by the central elastic material 44 and the center slit 45 is located at a position in contact with the inter-turn portion of the wearer. On the other hand, the curved portion formed by the side slits 46 is convex on the non-skin contact surface side, and is located at a position where it is hard to abut against the wearer's excretory opening.

Since the absorbent body is in close contact with the wearer's intercondyle, it is possible to prevent leakage of body fluid even when the urine flowing slowly along the skin is discharged. Further, in the folded state, in the curved portion of the portion of the absorbent body that is separated from the skin, the body fluid is made to face forward by forming a depression extending in the front-rear direction. It spreads to the outside in the back direction and prevents side leakage.

Since the central slit 45 and the side slit 46 formed in the absorbent body are bent at the base point, compared with the case where the thin portion is formed as the convex portion in the absorbent body 40, the absorbent body 40 is expanded even if the absorbent body 40 absorbs the liquid. 40 is still easy to bend. Moreover, the cross-sectional shape when the absorbent body 40 is deformed by wearing the disposable disposable diaper 1 is a tapered shape which is narrowed from the non-skin contact surface side toward the skin contact surface side. Therefore, it is easy to accommodate in the gap of the wearer's crotch portion without giving a strange feeling.

Further, the convex portion formed by the curved portion is composed only of the second layer 42 and has a thickness thinner than a portion formed by laminating the first layer 41 and the second layer 42. In other words, since the convex portion formed by the curved portion is thin and has a high height, it is easy to be inserted into a narrow gap between the crotch portions, and is likely to be in close contact with the excretory opening. Therefore, the urination mouth and the absorbent body are in close contact, so that the excreted urine can be quickly absorbed. Further, in the portion near the skin of the wearer's ankle, since the thickness of the absorbent body is thin, the thickness of the absorbent body can be folded to a greater extent from the skin, so that it can be worn without any abnormality.

Further, when an opening or a side slit is provided in both the first layer and the second layer, a positional shift occurs when the first layer and the second layer are overlapped. For example, when the positional deviation occurs in the width direction, the width of the pair of side slits disposed on the right and left sides is narrowed, and the inside of the pair of side slits is not deformed regularly, and the absorber is unbalanced to the left and right, which may adversely affect the absorbability and wearing feeling. . However, by providing an opening or a side slit in any of the first layer and the second layer, it is possible to prevent positional displacement such as a side slit.

(4) Method of manufacturing an absorbent article

An example of a method of producing an absorbent article according to the present embodiment will be described. Fig. 7 is an explanatory view showing a method of manufacturing an absorbent article, showing a part of a process of manufacturing an absorbent article. In the seventh drawing, the conveyance direction of the constituent parts in the manufacturing process is indicated by the conveyance direction MD, and the direction intersecting the conveyance direction is indicated by the cross direction CD. The method for producing an absorbent article is produced in a state in which the absorbent article 1 is continuous in the width direction.

Further, regarding the method not described in the embodiment, an existing method can be used. Moreover, the manufacturing method demonstrated below is only an example, and it can manufacture by other manufacturing methods.

The manufacturing method of the absorbent article includes at least an absorbent main body forming process S1, an outer casing forming process S2, a leg forming process S3, a component joining process S4, a folding process S5, a joining process S6, and a cutting process S7.

The absorbent body 1A is formed in the absorbent body forming process S1. Specifically, for example, the absorbent body 40 is formed by laminating the absorbent material, and the leakage preventing portion is formed, and after the bonding to the belt constituting the sheet 30 of the absorbent body, the absorbent body 40 is placed on the continuous belt; After the belt bodies constituting the surface sheet 10 are joined together, the leak-proof portion continuous bodies on both side portions are folded back to the surface sheet side.

The exterior body 1B is formed in the exterior body forming process S2. In the present embodiment, the front side continuous body 75F in which the outer sheet disposed on the wearer's front side is continuous and the rear side continuous body 75R in which the outer sheet disposed on the back side of the wearer are continuous are formed separately. Via the exterior center sheet 100 The outer casing 1B is produced by joining the front side continuous body 75F and the rear side continuous body 75R.

Specifically, a belly elastic material is disposed between the (front side outer top sheet) belt body 70FW constituting the front side exterior top sheet 70F and the (front side outer layer back sheet) belt body 80FW constituting the front side exterior back sheet 80F. 7A, the waist elastic material 3A and the front leg elastic material 5F to form the front side continuous body 75F, and the (back side outer top sheet) belt body 70RW constituting the rear side exterior top sheet 70R and the rear side outer back sheet Between the 80R (rear-side outer back sheet) belt body 80RW, a web elastic material 7A, a waist elastic material 3A, and a rear leg elastic material 5R are disposed to form a rear side continuous body 75R.

Then, the portion where the front leg elastic material 5F and the rear leg elastic material 5R are unnecessary (the portion exposed from the front side continuous body 75F and the rear side continuous body 75R) is cut, and the front side continuous body 75F and the rear side continuous body are cut. The 75R is joined by the outer center sheet 100. Thereby, the exterior body 1B of each product is formed in the exterior continuation body 90 continuous in the width direction. The process of joining the front leg elastic material 5F and the rear leg elastic material 5R to the exterior top sheet and the like in the exterior body forming process S2 will be described in detail later.

The leg circumference forming process S3 cuts the exterior body 1B along the front leg circumference elastic material 5F and the rear leg circumference elastic material 5R. Thereby, the leg-opening portion disposed on the leg circumference of the wearer is formed.

The component joining process S4 is used to join the exterior body 1B and the absorbent body 1A. Specifically, the absorbent main body 1A is placed on the continuous body of the outer casing 1B in which the leg-surrounding opening portion is formed, and the absorbent main body 1A and the outer casing 1B are joined via an adhesive.

In the folding process S5, the continuous body of the absorbent article in which the absorbent main body 1A and the exterior body 1B are joined is folded at a base point including the center in the intersecting direction and along the conveyance direction.

The end portion in the width direction of the folded absorbent article is joined at the joining process S6. Specifically, the front abdominal peripheral edge portion 4 and the rear abdominal peripheral edge portion 6 are joined, and the front abdominal peripheral edge portion 4' and the rear abdominal peripheral edge portion 6' are joined.

In the cutting process S7, the continuous body of the absorbent article is cut into the size of one product along the front-rear direction (cross direction) of the absorbent article. Thereby, the absorbent article 1 is manufactured.

Next, a method of joining the front leg elastic material 5F and the rear leg elastic material 5R between the exterior top sheet and the exterior back sheet in a part of the manufacturing process of the exterior body 1B will be described in detail with reference to FIG. . Fig. 8 is a schematic view showing a first subsequent region and a second succeeding region in which an adhesive is applied between the exterior top sheet and the exterior back sheet.

Further, between the exterior top sheet and the exterior back sheet, in addition to the first succeeding region and the second succeeding region, a rear region for joining the waist elastic material 3A and a joint for engaging the abdominal elastic material are provided. a region, and an engagement region for folding back and joining the front end portion of the front outer back sheet and the rear end portion of the rear outer back sheet. These subsequent regions are omitted for convenience of explanation, but may be formed, for example, by applying a bonding agent by a V-shaped slit method or a spiral method.

The front leg elastic member 5F is attached to the first rear region R1 and the second succeeding region R2 between the front outer top sheet 70F and the front outer back sheet 80F, and joined to the front outer top sheet 70F and the front outer cover. Back sheet 80F. The rear leg elastic material 5R is attached to the first rear region R1 and the second rear region R2 between the rear outer top sheet 70R and the rear outer back sheet 80R, and joined to the rear outer top sheet 70R and the rear side. Outer back sheet 80R.

In the present embodiment, the first sub-region R1 is coated with an adhesive by a non-contact coating method, and the second succeeding region R2 is coated with an adhesive by a contact method. Further, the coating method of the first sub-region may be a contact method, and the coating method of the second sub-region may be a non-contact coating method, and is not limited to the method of the embodiment.

The first succeeding region R1 and the second succeeding region R2 are partially overlapped. The first contiguous region R1 includes at least an area in which the leg-surrounding elastic material is disposed, and further includes: an elastic material contiguous region R11 for joining the leg-surrounding elastic material between the exterior top sheet and the exterior back sheet, and for engaging The outer top sheet and the outer back sheet are next to the area R12.

The method of joining the front leg elastic material 5F between the front outer top sheet 70F and the front outer back sheet 80F is the front side outer top sheet body constituting the front side outer top sheet 70F shown in FIG. After coating the adhesive on the 70FW and providing the second succeeding region R2 shown in Fig. 8(a), the adhesive is applied to the front outer cover top sheet tape 70FW constituting the front outer topsheet 70F, and the elastic material is provided in the area. R11. Further, an adhesive is applied to the front outer cover back sheet tape 80FW constituting the front outer cover back sheet 80F, and a sheet subsequent region R12 is provided.

Next, on the front side, the top sheet strip body 70FW and the front The front outer leg elastic member 5F is disposed in an extended state in any of the side outer back sheet webs 80FW. At this time, the front leg elastic material 5F is swayed in the intersecting direction, and is disposed so as to straddle the front outer top sheet strip 70FW or the front outer back sheet strip 80FW, and the front side outer top. The rear end portion of the sheet tape body 70FW or the rear end portion of the front side outer sheet back sheet tape body 80FW projects further rearward.

The front leg elastic material which protrudes rearward than the rear end portion of the front side outer sheet strip body 70FW or the rear end portion of the front side outer sheet back sheet belt 80FW is held by the belt member or the like in an extended state. . Next, the other of the front outer top sheet strip 70FW and the front outer back sheet strip 80FW is placed on one of the strips. Thereby, the front leg elastic material is disposed so as to straddle the region where the front outer top sheet strip 70FW and the front outer back sheet strip 80FW overlap, and the front outer sheet strip 70FW and the front side outer casing. The area where the back sheet strip body 80FW protrudes.

In this state, the strips are pressed in the thickness direction. By thus pressurizing, the front leg elastic material can be strongly bonded between the belt bodies. Then, the front leg elastic material projecting rearward is further rearward than the rear end portion of the front side outer top sheet strip 70FW or the front outer back sheet strip 80FW, along the front side outer top sheet strip 70FW or the front side The rear end portion of the back sheet tape body 80FW is cut. Thereby, the front leg elastic material 5F is disposed between the front outer top sheet 70F and the front outer back sheet 80F.

Joining the rear leg elastic material 5R to the rear side outer top sheet The method between the 70R and the rear outer cover back sheet 80R is applied to the rear side outer top sheet strip 70RW constituting the rear side outer top sheet 70R shown in Fig. 7, and the eighth sheet is provided. After the second subsequent region R2 shown in a), an adhesive is applied to the rear side outer sheet strip body 70RW constituting the rear side outer top sheet 70R, and an elastic material following region R11 is provided. Further, an adhesive is applied to the rear outer cover back sheet tape 80RW constituting the rear outer cover back sheet 80R, and a sheet subsequent region R12 is provided.

Next, the rear leg elastic material 5R is disposed in an extended state in any one of the rear side outer sheet strip body 70RW and the rear side outer sheet back sheet belt body 80RW. At this time, the rear leg elastic material 5R is swayed in the intersecting direction, and is disposed so as to straddle the rear side outer top sheet strip 70RW or the rear side outer back sheet strip 80RW, and the rear side. The front end portion of the exterior top sheet web 70RW or the front end portion of the rear side outer sheet strip body 80RW protrudes further forward.

The rear leg elastic material 5R which protrudes forward more than the front end portion of the rear side outer sheet strip body 70RW or the front end portion of the rear side outer sheet back sheet belt 80RW is sandwiched by a belt member or the like in an extended state. Handling. Next, the other of the rear outer top sheet strip 70RW and the rear outer back sheet strip 80RW is placed on one of the strips. Thereby, the rear leg elastic material is disposed so as to straddle the region where the rear outer top sheet strip 70RW and the rear outer back sheet web 80RW overlap, and the rear outer sheet strip 70RW and The rear side outer surface of the back sheet strip body 80RW protrudes.

In this state, the strips are pressed in the thickness direction. By such pressurization, the hind leg elastic material can be strongly bonded between the belt bodies. Then, the rear leg elastic material 5R projecting forward from the front end portion of the rear side outer top sheet strip 70RW or the rear outer back sheet strip 80RW, along the rear side outer top sheet strip 70RW The front end portion of the back side outer sheet strip body 80RW is cut off. Thereby, the rear leg elastic material 5R is disposed between the rear exterior top sheet 70R and the rear exterior back sheet 80R.

Next, the first succeeding region R1 and the second succeeding region R2 will be described in detail based on FIGS. 8 and 9. Fig. 9 is a cross-sectional view showing the succeeding region shown in Fig. 8 (based on the X3-X'3 line shown in Fig. 2).

Fig. 8(a) is a view showing the second succeeding region R2 and the elastic material following region R11 in the developed view shown in Fig. 2. The second following region R2 is provided to cover the rear end portion of the front leg elastic material 5F and the front end portion of the rear leg elastic material, and is coated with an adhesive for fixing the rear end portion of the front leg elastic material 5F and the rear portion. The front end portion of the leg-surrounding elastic material is surely joined between the exterior top sheet and the exterior back sheet.

The second succeeding region R2 is a region in which the front side outer sheet and the rear side outer sheet are coated with a hot-melt type adhesive at a basis weight of 10 g/m ² . In the second succeeding region R2, an adhesive is applied by contact coating by a slit coater method. The coating width of the second succeeding region R2 is about 20 mm.

The rear end portion of the front leg elastic material 5F and the front end portion of the rear leg elastic material 5R are disposed in the second succeeding region R2. 2nd subsequent region R2 The leg elastic materials are respectively disposed on the left and right legs, and are disposed discontinuously in the width direction. Further, the second succeeding region R2 may be continuous in the width direction. However, by providing the second succeeding region R2 discontinuously, the curing of the exterior body by the adhesive can be suppressed, and the flexibility of the exterior body can be ensured. Further, the application pattern of the second succeeding region is not limited to the shape of the embodiment, and may be, for example, a strip shape.

The second contiguous region R2 of the front abdominal region S1 is disposed further forward than the rear end portion of the front exterior top sheet 70F, and the second contiguous region R2 of the rear abdominal region S2 is positioned closer to the outer peripheral top sheet. The front end of the 70R is further rear. The distance between the second succeeding region R2 and the rear end portion of the front exterior top sheet 70F or the rear end portion of the rear exterior top sheet 70R is 5 mm.

The slit coater method is a contact type coating method in which the coating position shift is less than that of the non-contact type coating method. For example, when the adhesive is applied by a non-contact type spiral method, the adhesive in the vicinity of the end portion of the exterior top sheet may overflow, which may cause defects in manufacturing. However, it is applied by a contact type slit coater to prevent the adhesive from overflowing. As described above, by using the contact type coating method, the adhesive can be applied in the vicinity of the end portion of the top sheet which is the cut portion of the leg-surrounding material, and the leg-surrounding elastic material can be fixed in the vicinity of the cut portion.

The elastic material following region R11 is provided so as to cover the entire area in which the leg-surrounding elastic members are disposed, and is coated with an adhesive for bonding the entire leg-surrounding elastic material between the exterior top sheet and the exterior back sheet. The elastic material subsequent region R11 is coated with an adhesive from above the second subsequent region. It overlaps with a part of the second following region R2.

The elastic material following region R11 is a region in which the front side outer top sheet 70F and the rear side outer top sheet 70R are coated with a hot-melt type adhesive at a basis weight of 8 g/m ² . An adhesive is applied to the elastic material following region R11 by a non-contact coating in a spiral manner. The coating width of the elastic material subsequent region R11 is about 18 mm per coating nozzle. The plurality of columns are applied in the front-back direction along the width direction by the coating width.

Further, the spiral method has a mode in which the amplitude is narrower than the above-described example, and the coating width per one strip is narrow, and the interval between adjacent spiral heat fusions is narrow (multi-spiral method). The complex spiral method has less coating deviation in the width direction than the normal spiral method, and has a characteristic that the gap is less likely to occur in the width direction. When the overlap region of the present invention is used, the deviation of the end portion of the elastic member can be reduced, and the elastic member end can be made. The position of the department is more stable. As the overlap region, a Summit Nozzel method or the like can be exemplified in addition to the complex spiral method.

The elastic material following region R11 of the front abdominal region S1 is disposed further forward than the rear end portion of the front outer top sheet 70F, and the elastic material following region R11 of the rear abdominal region S2 is disposed at the outer peripheral top sheet 70R of the rear side. The front end is further rearward. The elastic material following region R11 has a distance of 10 mm from the rear end portion of the front exterior top sheet 70F or the rear end portion of the rear exterior top sheet.

The spiral method is non-contact coating, which is susceptible to wind and makes the coating position easily offset. However, by making the elastic material follow the region R11 and The rear end portion of the front outer top sheet 70F or the rear end portion of the rear outer top sheet is separated by 10 mm, which can suppress the overflow of the adhesive from the outer sheet and suppress the adhesion of the adhesive to the wearer's skin. The problem in the line.

Further, the elastic material following region R11 is provided so as not to overlap the joint portion 11 of the joint front belly edge portions 4, 4' and the rear belly edge portions 6, 6'. For example, when the bonding agent is applied to the bonding portion 11, there is a concern that the sealing strength of the bonding portion 11 (the ultrasonic sealing in the present embodiment) is lowered.

Further, the extension stress of the leg-surrounding elastic material is such that the entire leg elastic material is not uniform, but the stretching stress on the side of the crotch region is high, and the stretching stress on the side of the front abdominal region (or the side of the rear abdominal region) is low. . Therefore, the tensile stress at the end portion on the joint side of the leg-surrounding elastic material is configured to be low.

Since the leg-surrounding elastic material is disposed in this manner, the elastic material following region R11 is disposed so as not to overlap with the joint portion 11, even if the end portion of the leg-side elastic material on the joint portion side is not covered by the elastic material following region R11, It is still possible to prevent the deviation of the end portion on the joint side of the leg-surrounding elastic material. Further, since the abdominal elastic material 7A is disposed in the vicinity of the end portion on the joint portion side of the leg-surrounding elastic material, even if the outer casing 1B is not sufficiently shrunk by the leg-surrounding elastic material, it can still be abdomen The outer elastic material shrinks the outer casing 1B.

Fig. 8(b) is a view showing the sheet following region R12 in the developed view shown in Fig. 2. The sheet following region R12 is coated with an adhesive for joining the outer top sheet and the outer back sheet. The sheet following region R12 is a region in which the front side outer back sheet 80F and the rear side outer back sheet 80R are coated with a hot-melt type adhesive at a basis weight of 1.5 g/m ² .

In the sheet subsequent region R12, an adhesive is applied by non-contact coating by a control seam method. By controlling the slit method, it can be coated in a thin surface with a thin wire diameter. Therefore, the tactile sensation of the exterior top sheet and the exterior back sheet can be maintained, and a large non-joining portion (floating state) is not provided between the exterior top sheet and the exterior back sheet without impairing the appearance. Further, the control slit method can form a narrow coating nozzle (coating outlet) pitch compared to the spiral method, and since it is difficult to form a gap between the coated surfaces from the nozzles, irregular large floating between the sheets does not occur, and Good appearance. As described above, the method of coating the adhesive agent in a thin and planar manner can be exemplified by the Ω method and the vertex coating nozzle method.

The sheet following region R12 of the front abdominal region S1 is disposed further forward than the rear end portion of the front exterior top sheet 70F, and the elastic material following region R11 of the rear abdominal region S2 is disposed at the outer peripheral top sheet 70R of the rear side. The front end is further rearward. The sheet following region R12 has a distance of 8 mm from the rear end portion of the front exterior top sheet 70F or the rear end portion of the rear exterior top sheet 70R.

The sheet following region R12 overlaps the joint portion 11 of the joint front belly edge portions 4, 4' and the rear belly edge portions 6, 6'. The sheet following region R12 has a lower basis weight than the adhesive of the elastic material following region R11 as described above, in order to exert less influence on the sealing strength of the joint portion 11. Further, the sheet following region R12 may also be disposed so as not to overlap the joint portion 11.

Fig. 8(c) is a view showing a center-adjacent region R3 in which the exterior center sheet 100 is coated with an adhesive. Center followed by area R3 An area including an adhesive layer for bonding an outer center sheet 100 and a front outer back sheet 80F (or a rear outer back sheet 80R); and an adhesive applied to join the outer center The area of the sheet 100 and the front side outer top sheet 70F (or the rear side outer top sheet 70R). In the present embodiment, the exterior center sheet 100 is joined to the front end portion of the front outer top sheet 70F and the front end portion of the rear outer top sheet 70R via the center rear region R3.

The center succeeding region R3 is a region in which the exterior center sheet 100 is coated with a hot-melt type adhesive at a basis weight of 8 g/m ² . An adhesive is applied to the center succeeding region R3 by contact coating by a slit coater method. The length of the center-to-back region R3 in the front-rear direction is 20 mm with respect to the length of the front-back direction of the exterior center sheet 100 and the front-side exterior body or the rear exterior body 30 mm. The front side and the rear side of the center succeeding region R3 each have a 5 mm non-coated region which is not coated with an adhesive. The length of the uncoated region in the front-rear direction is 5 mm, and since it is shorter than the entire disposable diaper, for example, in the case where the uncoated region of the outer center sheet 100 is rolled up, the appearance is not impaired. In particular, in the case where the outer center sheet is disposed on the outermost side, the winding of the outer center sheet can be suppressed.

Among the outer center sheets 100, a region overlapping the front outer back sheet 80F (or the rear outer back sheet 80R) functions as a third sheet, the third sheet and the first succeeding region and the second sheet. The overlapping regions R4 in which the regions overlap are then overlapped.

In the present embodiment, a matrix polymer is a hot-melt adhesive of a synthetic rubber system (SIS) as an adhesive. Matrix polymer can be used An EVA based on EVA (vinyl acetate copolymer) or an olefin-based hot melt such as polyolefin. However, a matrix polymer having both an adhesive force (cohesive force) and a cohesive force is preferred as a synthetic rubber-based adhesive.

In the case where the elastic member is a flat shape such as a natural rubber or a synthetic rubber, it is preferable that the adhesion is excellent such as SEPS, and when the elastic member is a small contact area such as an elastic fiber, it is preferable that the cohesive force is high, and the synthetic rubber is preferable. The department also expects SIS or SBS.

Next, the joined state of the elastic member will be described based on Fig. 9. The front end portion of the rear leg elastic member 5R is extended to a state before the leg-surrounding elastic material is cut, and is extended to match the front end portion of the rear outer top sheet and the front end portion of the front outer back sheet. However, when the leg-surrounding elastic material is cut, the stretched state of the leg-surrounding elastic material is released. The front end portion of the rear outer cover top sheet and the front end portion of the front outer cover back sheet are not provided with the first rear region and the second rear region, and the front end portion of the rear leg elastic member 5R is not joined to the outer sheet. The front end portion of the rear leg elastic member 5R is contracted toward the inner side in the extending direction (the rear side in the present embodiment) after the cutting.

The front end portion 51 of the rear leg elastic member 5R after contraction is held in the overlapping region R4 where the first succeeding region R1 and the second succeeding region R2 overlap. In the overlap region R4, the first succeeding region and the second succeeding region are overlapped, and the basis weight (ratio of the first succeeding region and the second succeeding region) of the adhesive becomes higher, and the force is higher. Therefore, the movement of the front end portion 51 of the rear leg elastic member 5R can be suppressed in the overlap region R4. In this manner, by arranging the distal end portion 51 of the rear leg elastic member 5R in the overlapping region R4, the leg-surrounding elastic member is placed in an intended position in an extended state, and the leg of the intended region can be made by the elastic member. Shrink around the opening. Therefore, the fit of the leg circumference can be improved.

In the region in which the leg-surrounding elastic material is disposed, the end portion of the leg-surrounding elastic material (the end portion serving as the cutting portion) in which the contraction force of the leg-surrounding elastic material has a high function is disposed, by setting The overlap region R4 increases the basis weight of the adhesive, and can effectively reduce the movement of the leg elastic material caused by the cutback.

Further, in the present embodiment, the base of the adhesive in the vicinity of the cut end portion of the leg-surrounding elastic material is reconfigured to be higher than the basis weight of the first succeeding region and also higher than the base of the second succeeding region. Heavy composition. However, the basis of the first subsequent region may be reconstructed to be higher than the basis weight of the second subsequent region.

Further, the overlapping region R4 may be an overlapping region of at least one of the elastic material following region R11 and the sheet following region R12 constituting the first succeeding region. Further, the first succeeding region may be constituted by only one of the elastic material following region R11 and the sheet following region R12.

The outer top sheet, the outer back sheet, and the outer center sheet are formed of a non-woven fabric. If the basis weight of the adhesive is too high, the adhesive is transmitted and exposed. However, the number of sheet layers of the first succeeding region R1 other than the portion in which the outer center sheet 100 is disposed so as to cover the overlap region R4 and the overlap region R4 is overlapped with the outer center sheet 100 in the first succeeding region R1 is disposed. More. Therefore, the basis weight of the adhesive in the overlap region R4 is high, and even if the adhesive is leached from the sheet, it can be protected by the exterior center sheet 100 as a cover material. Thus, it can be suppressed The adhesive adheres to the wearer's skin and the like to prevent skin problems.

Further, another sheet may be laminated on the outer side of the sheet coated with a large amount of the adhesive (for example, a sheet provided with an overlapping region). The touch is soft by providing a sheet in a direction other than the sheet provided with the overlapping area. Further, in the present embodiment, the exterior center sheet is provided to cover the overlapping area, but other sheets may be disposed to cover the overlapping area.

The outer casing 1B has (refer to FIG. 9) a contraction region R5 in which the outer casing is contracted by the leg-surrounding elastic material; and a contraction direction in the contraction region is disposed adjacent to the contraction region R5, and the outer casing is not used A non-contracted region R6 in which the leg elastic material contracts. The non-shrinkage region is disposed on the end side of the outer casing 1B whose elastic member is cut away from the contraction region.

The contraction region R5 refers to a region in which the length of the sheet overlapping the elastic member becomes a state shorter than that before contraction by contraction of the elastic member fixed by stretching. The term "shrinkage" as used herein refers to a state in which the fiber length is shorter than before shrinkage, and also includes a state in which a three-dimensional coil-like crimp is found to shorten the fiber length of the appearance. Further, the contraction region refers to a region in which the stretchability is substantially found, and even in the region where the elastic member exists, the region in which the rigidity is increased due to heat sealing or the like, and substantially no stretchability is found. On the other hand, the non-shrinkage region R6 refers to a region where neither the width direction nor the longitudinal direction has a stretching force. The expansion and contraction force of the non-shrinkage region is 0 (N/cm). The end portion of the contraction region R5 on the non-shrinkage region side is a boundary between the contraction region R5 and the non-contraction region R6.

The boundary of the non-shrinkage region of the contraction region R5 can be determined, for example, according to the contraction state in appearance. Specifically, depending on whether there are wrinkles or not It is judged that the region in which the wrinkle is not formed is a non-contracted region, and the region in which the wrinkles are generated is a contracted region. The end of the wrinkle is the junction of the contracted area and the non-contracted area.

Further, the boundary between the contraction region R5 and the non-contraction region R6 can be detected by any of the following two methods.

The first detection method detects the boundary between the contraction region R5 and the non-contraction region R6 based on the length. First, mark the part considered to be the end of the contraction area. The state in which the sample is placed without applying force is marked at the other end from the mark position to the non-shrinkage region side at an arbitrary length. Then, the distance between the two points marked has been determined. This distance is taken as the distance A of the natural length.

Next, the two points that have been marked are stretched by hand to stretch, and the distance between the two points marked is measured. This distance is taken as the distance B at the time of stretching.

At this time, when the relationship of B>A is satisfied, it is determined that the two points measured are included in the contraction region.

Therefore, the mark position at the portion considered to be the end portion of the contraction region is corrected, and the position deviated from the non-shrinkage region side is marked and measured again.

On the other hand, as a result of the measurement, when the relationship of B=A is satisfied, it is determined that the two points measured are included in the non-contracted region.

In order to determine the boundary between the contraction region R5 and the non-contraction region R6, marking is performed on the side of the contraction region, and the measurement is again attempted. The distance between the two points marked is the distance A of the natural state and the distance B of the extended state. It becomes the point of the same distance, and this point is used as the boundary between the contracted area and the non-contracted area.

Further, the second detection method detects the boundary between the contraction region R5 and the non-contraction region R6 based on the stress.

1) A sample to be measured is prepared, and an elastic member and a sheet member overlapping the elastic member are taken in a predetermined size so as to include a portion (an end portion of the wrinkle) which is considered to be a boundary between the contracted region and the non-contracted region. . The size of the sample, for example, the width is 10 mm, the length is the natural length (length when stretched) and the mark is made at 50 mm, taking a length of 100 mm.

2) The 50 mm mark portion of the above sample was set in a jig of a tensile tester and mounted so as to be sandwiched between the jigs.

3) Find the stress value of 95% of the 50 mm length, that is, when the clamp reaches 47.5 mm.

4) The length of the mark of the sample is shortened so that the length of the side of the contraction region is shortened, and the stress value when the clamp reaches 95% in the same direction is obtained for the length.

5) The mark position on the side of the contraction region when the above stress reaches zero becomes the boundary between the contraction region and the non-contraction region.

Further, the width and length of the sample for measuring the stress can be appropriately changed depending on the state of the product.

Since the end portion of the contraction region R5 on the non-shrinkage region side (the boundary between the contraction region and the non-contraction region) is located in the overlap region, the sheet can be shrunk from the portion where the overlap region is provided, and the intended region can be collected. Shrink. For example, in the case where the leg wrinkles are provided discontinuously, the deviation of the end portions of the leg-surrounding elastic members which are discontinuously arranged can be suppressed. Therefore, the leg elastic material that has been disposed effectively functions, and an elastic material having a minimum necessary limit in the portion where the leg wrinkles are to be provided can be realized. Further, since the sheet sandwiched between the elastic members is not wasted, wrinkles excellent in cost efficiency can be provided.

(5) Modifications

Next, the disposable diaper of the modification will be described with reference to Figs. 10 to 18 . In the following embodiments, the same components as those of the above-described embodiments are denoted by the same reference numerals and will not be described.

Fig. 10 is a view showing the disposable diaper of Modification 1. Fig. 11 is a cross-sectional view of the exterior body taken along the line X4-X'4 shown in Fig. 10. The disposable diaper of the first modification does not include the outer center sheet 100, and the front outer top sheet and the front outer back sheet, the rear outer top sheet, and the rear outer back sheet are joined by the absorbent main body 1A.

The front leg elastic members 5F are continuously arranged in the width direction, and the rear leg surrounding elastic members 5R are arranged discontinuously. The leg-opening portion 9 and the rear leg-surrounding elastic member are located on the outer side in the width direction of the absorbent main body 1A, and are not overlapped with the absorbent main body 1A.

The disposable diaper of the first modification includes an auxiliary sheet as a third sheet. The auxiliary sheet 101 is disposed between the rear side outer top sheet and the rear side outer back sheet. The auxiliary sheet 101 is formed by an SMS nonwoven fabric having a basis weight of 13 g/m ² , and the exterior top sheet of Modification 1 is formed by a spunbonded nonwoven fabric having a basis weight of 18 g/m ² , and the exterior back sheet is made of a basis weight of 16 g. /m ² spunbonded non-woven fabric.

The manufacturing method of the disposable paper diaper thus constructed is based on the auxiliary sheet 101 or the outer back sheet, and an auxiliary sheet following region R7 for joining the auxiliary sheet 101 and the outer back sheet is provided. In the auxiliary sheet following region R7, an adhesive was applied at a basis weight of 8 g/m ² by contact coating by a slit coater method. Then, the auxiliary sheet 101 and the exterior back sheet are joined.

Next, the second succeeding region R2 is provided on the side of the leg-surrounding elastic material side of the composite sheet to which the auxiliary sheet 101 and the exterior back sheet are joined. In the second subsequent region R2, contact application was carried out by a slit coater method, and an adhesive was applied at a basis weight of 10 g/m ² . After the elastic material following region R11 is provided on the side of the leg-surrounding elastic material side on which the composite sheet is disposed, the leg-surrounding elastic material is placed in an extended state. The adhesive was applied at a basis weight of 8 g/m ^{2 in a} non-contact coating by a spiral method in the elastic material following region R11.

Further, a sheet-following region R12 is provided on the exterior top sheet for joining the exterior top sheet and the composite sheet. The adhesive was applied at a basis weight of 1.5 g/m ² in the sheet follow-up region R12 by non-contact coating by a controlled slit method. After the exterior top sheet and the composite sheet are overlapped and pressurized, the leg-surrounding elastic material extending from the exterior top sheet and the composite sheet is cut, whereby the exterior body can be manufactured.

Further, in the disposable diaper of the first modification, the leg-opening portion is located on the outer side in the width direction of the absorbent main body. Therefore, the absorbent main body 1A can be bonded to the outer casing 1B to form the leg-opening portion.

Figure 12 is a view of the disposable diaper constituting the modification 2 A cross-sectional view of the body. In the disposable diaper of the first modification, the auxiliary sheet 101 is disposed between the exterior top sheet and the exterior back sheet, and the disposable diaper of the second modification arranges the auxiliary sheet in the inner direction of the outer sheet. . Further, the auxiliary sheet 101 may be disposed in an outer direction from the outer back sheet.

The auxiliary sheet 101 is formed by a spunbonded nonwoven fabric having a basis weight of 16 g/m ² , and the exterior top sheet is formed by an SMS non-woven fabric having a basis weight of 15 g/m ² , and the outer back sheet is made of a basis weight of 16 g/m ² . Spunbonded non-woven fabric is formed.

In the method of manufacturing a disposable diaper configured as described above, the second succeeding region R2 is provided on the exterior top sheet. In the second subsequent region R2, contact application was carried out by a slit coater method, and an adhesive was applied in a strip shape at a basis weight of 20 g/m 2 . The second succeeding region R2 is provided with five strips having a width of 2 mm, and each of the second succeeding regions R2 is spaced apart by 2 mm. By providing the second succeeding region in this manner, it is possible to alleviate the hardness of the overlapping region in which the sheets are stacked in three layers.

Next, after the elastic top material region R11 is provided on the exterior top sheet, the leg-surrounding elastic material is placed in an extended state. The adhesive was applied at a basis weight of 8 g/m ^{2 in a} non-contact coating by a spiral method in the elastic material following region R11.

Further, a sheet-following region R12 is provided on the exterior back sheet for joining the exterior top sheet and the exterior top sheet. The adhesive was applied at a basis weight of 1.5 g/m ² in the sheet follow-up region R12 by non-contact coating by a controlled slit method. Then, the outer top sheet and the outer back sheet are joined.

Moreover, an auxiliary sheet subsequent region R7 is provided on the auxiliary sheet 101 for joining the auxiliary sheet 101 and the exterior top sheet. The adhesive was applied at a basis weight of 8 g/m ² in the auxiliary sheet subsequent region R7 by contact coating by a slit coater method. Then, the auxiliary sheet 101 and the exterior top sheet are joined.

Fig. 13 is a developed plan view of the disposable diaper of Modification 3. Compared with the disposable diaper of Modification 1, the hind legs are different in elastic material. In the third modification, the end portion of the leg-surrounding elastic material 5R on the front abdominal region side is disposed not at the front end portion of the rear exterior sheet and the front end portion of the rear-side exterior sheet, but at the center side in the width direction. The side of the absorbent body.

In the method of arranging the rear leg elastic material, for example, the left leg elastic material and the right leg elastic material are disposed in a continuous state, and the rear leg elastic material is cut at the center of the product. Figure 13 is a schematic view showing the cut portion C. The hind leg surrounding elastic material 5R cut at the center of the product is contracted outward in the width direction, and the left and right rear leg surrounding elastic members are separated from each other.

The second contiguous region R2 is provided on both sides of the absorbent body in advance, and the first contiguous region R1 is provided in the region where the leg-hole elastic member is disposed, and the overlapping region R4 in which the first contiguous region and the second contiguous region are overlapped is covered. The auxiliary sheet 101 is disposed in the inner direction of the exterior top sheet. In this manner, by providing the first succeeding region R1, the second succeeding region R2, and the auxiliary sheet 101, the back-cut elastic member is held in the overlapping region, and the elastic member in the extended state can be disposed in the intended region.

Figure 14 is a disposable paper diaper of Modification 4, Figure 2 The X3-X'3 line shown is a schematic cross-sectional view of the reference. Disposable Paper Diaper of Modification 4 The disposable paper diaper of the embodiment has a different position of the front end portion 51 of the rear leg elastic material 5R.

The front end portion 51 of the rear leg elastic member 5R of the disposable diaper of the fourth modification is not disposed in the overlap region R4 but in the front side of the overlap region R4. However, the front end portion 51 of the rear leg elastic member 5R is not reliably joined to the rear outer top sheet or the like by the adhesive, and the rear leg elastic member 5R is from the front end portion 51 and is in a non-stretched state in a certain region. . Therefore, the end portion of the contraction region R5 of the rear leg elastic material 5R on the non-contraction region R6 side is rearward of the front end portion 51 of the rear leg elastic member 5R, and coincides with the front end portion of the overlap region R4.

Further, the end portion of the disposable diaper-retracted region R5 of the fourth modification on the non-contracted region R6 side coincides with the front end portion of the overlapping region R4, but the configuration is not limited thereto. For example, the end portion of the contraction region R5 on the non-contraction region R6 side may be disposed in the overlap region R4. Moreover, the front end portion 51 of the rear leg elastic member 5R can be disposed in the outer direction (the front side as shown in FIG. 14) than the overlap region, and can be disposed in the region overlapping the second rear region R2. It is outside the overlapping area and is in a region that does not overlap the second subsequent region R2.

Fig. 15 is a schematic cross-sectional view showing the disposable diaper of Modification 5 based on the X3-X'3 line shown in Fig. 2. The disposable diaper of the fifth modification is a position of the front end portion 51 of the rear leg elastic material 5R and the position of the rear outer top sheet 70R and the rear outer surface sheet 80R with respect to the disposable diaper of the embodiment. The relationship is different.

The front end portion 51 of the rear leg elastic member 5R of the disposable diaper of the fifth modification coincides with the front end portion of the second succeeding region R2. However, the front end portion 51 of the rear leg elastic member 5R is not reliably joined to the rear outer top sheet or the like by the adhesive, and the rear leg elastic member 5R is from the front end portion 51 and is in a non-stretched state in a certain region. Configuration. Therefore, the end portion of the contraction region R5 formed by the rear leg elastic member 5R on the non-contraction region R6 side is located further rearward than the front end portion 51 of the rear leg elastic member 5R, and is more than the front end portion of the overlap region R4. Behind the back. That is, the end portion of the contraction region R5 formed by the rear leg elastic material 5R on the non-contraction region R6 side is located in the overlap region R4.

Moreover, in the modification 5, the front end portion of the rear exterior back sheet 80R is located further forward than the front end portion of the rear exterior top sheet 70R. The front end portion of the rear exterior back sheet 80R is located on the outer side in the front-rear direction (the front side shown in FIG. 15) than the front end portion of the rear exterior top sheet 70R, so that the front end portion of the top sheet 70R is attached to the rear side. The front end portion of the second succeeding region R2 applied in the vicinity can prevent the rear exterior back sheet 80R from protruding outward in the front-rear direction. For example, at the time of manufacture, even if the position of the rear exterior top sheet 70R is shifted, the position of the rear exterior back sheet 80R is shifted, and the position of the second succeeding region is shifted, the rear side exterior can be used. The back sheet 80R covers the second succeeding region to prevent the adhesive from being exposed.

Further, from the viewpoint of preventing the adhesion between the rear side outer top sheet 70R and the rear side outer back sheet 80R, the rear side outer top sheet 70R and the rear side outer back sheet 80R will be located. It is desirable that the end portion of the sheet material in the outer direction OUT is disposed to extend more than the end portion of the sheet material located in the inner direction IN. However, as a modification, the end portion of the sheet material located in the inner direction IN may be disposed to extend beyond the end portion of the sheet material located in the outer direction OUT.

Further, the basis weight of the second succeeding region R2 is higher than that of the first succeeding region R1, and the adhesive agent easily overflows. Therefore, the sheet material which is disposed on the end side of the sheet material (the adhesive constituting the second succeeding region R2) is disposed in comparison with the other from the viewpoint of preventing the adhesive from overflowing in the second succeeding region R2. It is desirable that the sheet material is further inward in the front-rear direction.

Further, the distance L1 between the front end portion of the rear exterior top sheet 70R and the front end portion of the rear exterior back sheet 80R is preferably 0 to 15 mm. For example, if the distance L1 between the front end portion of the rear exterior top sheet 70R and the front end portion of the rear outer cover back sheet 80R is too long, the area where the rear side outer top sheet 70R and the rear side outer back sheet 80R are laminated Shortened, and the elastic material with legs is exposed.

In the embodiment, the configuration of the elastic member is not only cut along the end portion of the sheet material constituting the exterior body, but also applied to the portion other than the end portion of the exterior body.

Fig. 16 to Fig. 18 are views showing a disposable paper diaper as an absorbent article of Modification 6. Fig. 16 is a developed plan view of the disposable diaper of Modification 6. The disposable diaper of the sixth modification includes the absorbent main body 1A and the package 1B disposed outside the absorbent main body 1A. The disposable diaper has a crotch region S3 located at the crotch portion of the wearer and a crotch region disposed in front of the crotch region S1, and the abdominal area S2 after being disposed behind the crotch region. The absorber 40 has a pair of curved portions which are located on the outer side in the width direction from the center in the width direction of the absorber 40, and are formed so that the absorber can be curved in a convex shape in the outward direction.

The bent portion is a press portion 47 formed along the longitudinal direction. The press section is formed by compressing the absorber in the thickness direction. Further, although the curved portion of the present embodiment is constituted by a press portion, it may be constituted by a slit (for example, a side slit 46) formed in the absorber. Further, the absorber 40 has a central absorbing portion that is disposed between the pair of press portions 47 and does not have a bent portion. The central absorbing portion is a region between the press portions 47 of the absorber 40, and a region where the press portion and the slit constituting the bent portion are not formed.

When the pair of curved portions are deformed in the outward direction, the absorbent body is deformed to cover the deformed base of the buttocks of the wearer. Therefore, it is desirable to be located outward in the width direction from the collapsed position of the buttocks of the wearer. In addition, the distance between the pair of curved portions (the length of the central absorbent portion in the width direction) can be appropriately set in accordance with the storage space of the stool described later, and is 50 mm in the present embodiment.

A rear leg elastic material 5R as a plurality of elastic members is disposed in the exterior body 1B. The rear leg elastic material 5R has a linear straight portion 52 extending in the width direction, and a curved curved portion 53 located outward in the width direction from the straight portion 52 and outward in the width direction from the inner side in the width direction. It extends from the front side as the inner side in the front-rear direction toward the rear side as the outer side in the front-rear direction. The straight portion 52 is disposed along the abdominal elastic material. The curved portion is disposed along the leg-opening portion 9.

The straight portion 52 of the hind leg surrounding elastic material 5R overlaps with the press portion 47 of the absorber. The straight portion 52 and the press portion 47 are overlapped in the thickness direction. In addition, the state in which the linear portion 52 and the press portion 47 are overlapped is not only in a state in which the linear portion 52 and the press portion 47 are in contact with each other, but in the present embodiment, the other components such as the rear-side exterior top sheet 70R are also overlapped. The concept of the state.

The curved portion 53 of the hind leg surrounding elastic material 5R is disposed on the outer side in the width direction of the absorber 40. The curved portion 53 of the hind leg surrounding elastic material 5R and the absorber are disposed so as not to overlap each other in the thickness direction.

The stretch ratio of the curved portion 53 of the hind leg elastic member 5R is higher than the stretch ratio of the straight portion 52 of the rear leg elastic member 5R. The stretching ratio referred to herein is an elongation ratio S in a stretched state in which the disposable diaper is stretched. The elongation can be measured, for example, by the following method.

The product is fixed in a state in which the elastic member is stretched by 100%, and the dimensions of the straight portion (between both end portions in the inner width direction) and the curved portion (from the inner side of the inner side to the inner side in the width direction) are measured (this size is I). . After the mark is added to the end portions of the straight portion and the curved portion described above, the elastic member portion is cut. After completely removing the adherend such as hot melt, the elastic member in the non-stretched state is placed in a straight state, and the size is measured by a ruler (this size is II). The calculated value of I/II is the stretch rate.

Specifically, the elongation of the straight portion is 1.2 to 1.6 times, and the elongation of the curved portion is 2.1 to 2.5 times.

The disposable diaper thus constructed is passed through the absorbent body by the wearer's leg while the wearer is wearing it. A pair of press portions 47 of 40 deforms the absorber 40 in the outward direction. Since the absorber 40 is deformed from the press portion 47 as a starting point, the absorber between the press portions 47 is disposed to face the inter-turn portion of the wearer. At this time, since the press portion 47 of the absorber 40 is a central absorbent portion in which the bent portion is not formed, the central absorbent portion between the press portions 47 is less likely to be a deformation base point. Therefore, a flat state absorbent body is disposed below the crotch portion of the wearer, and a accommodating space such as feces can be formed below the wearer.

Further, since the straight portions are overlapped in the pair of press portions, the distance between the pair of bent portions is shortened by the contraction of the straight portions, and the length in the width direction of the space disposed opposite to the wearer's crotch portion is changed. short. The width of the absorber expands from the region facing the crotch portion toward the front-rear direction. Therefore, the absorber has a bowl shape which expands from the crotch toward the outer side in the front-rear direction and from the inner side in the width direction toward the outer side in the width direction. The absorber can be arranged along the curvature of the body such as the buttocks.

In addition, since the elongation of the curved portion is higher than that of the straight portion, the outer casing and the absorbent main body which are located outside the absorbent body in the width direction are more likely to shrink. By shrinking the outer side of the absorbent body in the width direction, the absorbent body can be easily pulled up, and the absorbent body can be disposed along the wearer's body.

For example, when the elastic member (the rear leg elastic material 5R in the present embodiment) which is disposed to overlap the absorbent body has a high stretch ratio, the absorbent body may have an unintended state due to shrinkage of the leg elastic material. The situation of deformation. If the absorbent body forms a portion that is in contact with the wearer, that is, the unintentional unevenness of the absorbent body, the absorbent body and the body become easy to be in point contact, and the absorbent body is connected. The tactile sensation of the touched portion and the non-contacted portion is different, resulting in an uncomfortable feeling. Further, if the unintended irregularities are formed on the surface of the absorbent body, the portion disposed along the body is not formed to be constant, and the space for storing the feces disappears, and the feces may easily leak.

Further, by forming a bent portion such as a press portion in the absorber, the absorber can be deformed at an intended position. However, when the absorbent body is not in close contact with the body, when the wearer performs an action such as walking, a gap is further generated between the absorbent body and the body, and the absorbent body comes into contact with the leg portion to become uncomfortable. Further, in the case where the absorbent body is not in close contact with the body, if the wearer wears the hair for a long period of time, the disposable disposable diaper falls off and the gap is generated to cause leakage.

According to the absorbent article of the sixth modification, the absorbent article is formed into a desired state by the press portion 47 as the curved portion, and a space for storing the feces can be formed below the wearer. Further, since the stretch ratio of the hind leg-surrounding elastic material 5R which overlaps with the press portion of the absorbent body is low, it is possible to suppress the formation of unintentional irregularities in the absorbent body and to arrange the absorbent body along the wearer's body.

Next, a modification of the disposable diaper of the sixth modification when worn will be described based on Figs. 17 and 18 . Fig. 17 is a view showing the stretched state of the disposable diaper of Modification 6, wherein (a) is a cross-sectional view taken along the line X5-X'5 shown in Fig. 16, and (b) is X6-X' shown in Fig. 16. 6-line cross-sectional view. Fig. 18 is a view showing the natural state of the disposable diaper of Modification 6, wherein (a) is a cross-sectional view taken along the line X5-X'5 shown in Fig. 16, and (b) is X6-X' shown in Fig. 16. 6-line cross-sectional view.

In addition, the stretched state is a state in which the wrinkles such as the surface sheet 10 and the exterior top sheet of the disposable diaper are not visually recognized, and the leg-surrounding elastic material and the waist elastic material are stretched. Further, in the natural state, the disposable diaper was placed in an atmosphere of 20 ° C ± 2 ° C and a relative humidity of 60% ± 5% RH for 24 hours.

In the stretched state in which the disposable diaper is stretched, the elastic member such as the rear leg elastic material 5R of the disposable diaper is stretched, and the exterior body 1B, the absorbent body 40, and the like are not shrunk by the elastic member. Therefore, the distance D1 between the press portions 47 in the cross-sectional view of the X5-X'5 line and the distance D2 between the press portions 47 in the cross-sectional view of the X6-X'6 line are the same length.

On the other hand, in the natural state of the disposable diaper, the disposable diaper is shrunk by an elastic member such as the rear leg elastic material 5R. When worn, the disposable diaper is closer to the stretch than the natural state. The absorbent body 40 is contracted by the hind leg surrounding elastic material, and the distance D1 between the press portions in the cross-sectional view of the X5-X'5 line is shorter than the distance D2 between the press portions 47 in the cross-sectional view of the X6-X'6 line. At this time, the absorber 40 is contracted in the width direction in a state where the press portion 47 is deformed as a starting point. Therefore, the absorber is curved along the curvature of the wearer's buttocks. Further, the stretch ratio of the curved portion 53 of the leg-surrounding elastic material 5R which is located outside the widthwise direction of the absorbent body is higher than the stretch ratio of the straight portion 52 of the leg-surrounding elastic material 5R which overlaps with the absorbent body, and therefore is absorbed in specific absorption. The body 40 is further outward in the width direction, and the disposable paper diaper is more contracted. Therefore, the outer body which is located outside the width direction of the absorbent body is in close contact with the wearer's body, and the disposable disposable diaper is worn so as to cover the buttocks of the wearer.

Further, since the absorbent body that is in contact with the wearer's body overlaps with the straight portion having a low stretch ratio, it is less likely to be deformed. Further, since the curved portion having a high stretch ratio is disposed on the outer side in the width direction from the absorber, it is easier to shrink than the region in which the absorber is disposed. Since the curved portion is disposed rearward and outward in the width direction, the wearing portion functions to pull the rear portion of the leg circumference toward the rear side in the wearing state. Therefore, in the wearing state, in the disposable diaper, the force that pulls the absorbent body upward obliquely acts and the absorbent body is in close contact with the body. By absorbing the entire disposable diaper from the outer side of the absorbent body in the width direction, the absorbent body is disposed along the wearer's body, and the absorbent body is not easily deformed during the squatting, thereby preventing the absorbent body from being uncomfortable between the two feet. Distortion of the sense and absorption body.

In addition, since the force of the entire disposable disposable diaper is pulled up by the leg-surrounding elastic material 5R, the positional deviation of the absorbent body in the width direction can be prevented, and the end portion in the width direction of the absorbent body can be prevented from protruding into the leg root.

In addition, if the elastic force of the leg-surrounding elastic material is too strong, the stimulation to the wearer is strong, and there is a rough skin or erythema. On the other hand, if the elastic force of the leg-surrounding elastic material is too weak, the pulling-up force is weak, and it becomes difficult to use or becomes hard to be in close contact with the body. Therefore, it is preferable to use 470 dtex to 940 dtex, and the number of the leg-surrounding elastic members is good. It is better to use 2~4.

Further, since the straight portion 52 overlaps the absorber at the rear side of the center in the front-rear direction of the absorber, the absorber in the region of the wearer's buttocks can be formed into a bowl shape. Therefore, the absorber can be arranged along the buttocks.

The absorbent body has a sloped region 48 that is sucked The length in the width direction of the body is lengthened from the center portion in the front-rear direction of the absorber toward the outer side in the front-rear direction. The straight portion 52 of the rear leg elastic member 5R overlaps with the inclined region 48 of the absorber. The inclined region is a region in which the length in the width direction of the absorber is elongated toward the outer side (front side and rear side) in the front-rear direction among the outer end portions in the width direction of the absorber. In Fig. 16, the inclined area is displayed with a little chain line.

The absorption system is composed of a narrowest region located at the center in the longitudinal direction of the absorbent body, a widest region located at both end portions in the longitudinal direction of the absorbent body, and an inclined region. The sloped area on the hip side is located between the narrowest area and the widest area. Most of the side leakage when sleeping or sleeping on the side is the outflow of urine from the inclined area. Further, if the inclined region is wrinkled or rolled, the absorbent body becomes a shape that does not follow the body, and side leakage is more likely to occur. However, since the straight portion 52 of the rear leg elastic member 5R overlaps with the inclined portion 48 of the absorbent body, the wrinkles of the inclined region of the absorbent body can be eliminated by stretching the straight portion 52 of the rear leg elastic member 5R. In particular, when the wearer does not wear the wearer himself, the straight portion 52 of the leg elastic material 5R is stretched, that is, the wrinkles or the curl of the absorbent body can be easily eliminated. By reducing wrinkles or curling of the absorbent body, leakage of body fluids can be reduced.

Further, the rear leg elastic material 5R as the elastic member of the disposable diaper of the sixth modification has a straight portion and a curved portion and is disposed across the curved portion, but may be configured as a front leg elastic material 5F as an elastic member. The linear portion and the curved portion are disposed so as to be disposed across the curved portion, and the portion disposed on the front side of the wearer is formed into a bowl shape.

Next, the modification 7 will be described as an absorption according to FIG. Disposable disposable diapers for sexual goods. The disposable diaper press portion 47 of the seventh modification is inclined in the longitudinal direction. The distance between the pair of press portions 47 is longer than the inner side (front side) of the press portion in the front-rear direction (the rear side) of the press portion. In this manner, since the press portion 47 has a shape that expands outward in the front-rear direction, when the absorber is deformed by the leg-surrounding elastic material 5R, the distance between the press portions on the front side of the absorber can be made larger than the distance between the press portions 47 on the rear side of the absorber. The short distance allows the disposable diaper to be deformed into a bowl shape extending from the underarm area toward the rear abdominal area.

In addition, in the modified example 6 and the modified example 7, the length in the width direction of the absorption system is elongated from the center in the front-rear direction toward the outer side in the front-rear direction, but the shape of the absorber is not limited thereto. For example, the length of the absorbent body in the width direction may be constant.

The curved portions of the absorbent body according to the sixth modification and the seventh modification are constituted by the press portion, but the curved portion may be formed by the slit. For example, in the case where the thickness of the absorber 40 is thin, a difference in rigidity is generated between the region where the press portion 47 is formed and the surrounding region by forming the press portion 47 in the absorber, and the absorber can be made based on the press portion. Deformation. Further, in the case where the thickness of the absorber 40 is thick, the depth of the press section must be formed deep.

On the other hand, in the case where a slit is used as the bent portion, the absorber can be deformed with the slit as a base point. The slit can be set more than the press portion due to the thickness of the absorber. However, since pulp or the like as an absorbent material is not disposed in the portion where the slit is formed, there is a case where urine flows along the slit. Especially in the state of sleeping on the side and sleeping on the side, if the urine flows through the gap from the urination point, the direction of the urine flow becomes the direction of gravity, so the flow velocity on the gap becomes Fast, easy to leak. Therefore, it is preferable to form the press section rather than the slit depending on the posture of the wearer but from the viewpoint of not easily leaking.

(6) Other embodiments

As described above, the content of the present invention is disclosed by the embodiments of the present invention, but the description and drawings which constitute a part of the present disclosure are not to be construed as limiting the present invention. In view of the present disclosure, various alternative embodiments, embodiments, and operational techniques will be apparent to those skilled in the art.

For example, the above embodiment describes a pants-type disposable diaper, but the present invention is not limited thereto, and is also applicable to an open-type disposable diaper, an incontinence pad, a physiological pad, and the like.

In the above-described embodiment, the leg-surrounding elastic material has been described as an elastic member. However, the elastic member in the present invention may be applied to other elastic members such as an elastic member that constitutes a wrinkle on the leg side.

Further, in the above embodiment, the exterior center sheet or the auxiliary sheet functions as the third sheet member, but a part of the absorbent body may function as the third sheet member.

Moreover, in the above-described embodiment, the rear leg elastic material 5R and the rear outer top sheet 70R and the rear outer back sheet 80R which are disposed to sandwich the rear leg elastic material are exemplified and described, but the present invention is not limited to this embodiment. In the form, the front leg outer elastic member 5F and the front outer cover top sheet 70F and the front outer cover back sheet 80F which sandwich the front leg elastic material are also possible. In this case, the end portion of the elastic member is the rear end portion of the front leg elastic member 5F, and the end portion of the contraction region on the non-contraction region side is the contraction region of the front abdominal region. After the end.

In the above-described embodiment, the absorbent body that is continuous in the front-rear direction is cut, and the 90-degree direction is attached to the exterior body 1B. However, the configuration is not limited thereto.

In the present embodiment, the absorber 40 is a two-layer structure of the first layer 41 and the second layer 42, but the absorber 40 of the wearing article of the present invention may have only the first layer or three or more layers.

As such, the present invention naturally includes various embodiments and the like which are not described herein. Accordingly, the technical scope of the present invention is to be determined by the scope of the invention as defined by the appended claims.

5R‧‧‧ rear leg elastic material

51‧‧‧ front end

70R‧‧‧ After the outer top sheet

80R‧‧‧ rear side outer back sheet

100‧‧‧Outer center sheet

R2‧‧‧2nd continuation area

R3‧‧‧ Center followed by area

R4‧‧‧ overlapping area

R5‧‧‧ contraction area

R6‧‧‧ non-shrink area

R11‧‧‧ elastic material followed by area

R12‧‧‧Front area

Claims (5)

An absorbent article comprising: an absorbent body having a front-rear direction extending toward a front side and a rear side of a wearer, a width direction orthogonal to the front-rear direction, an inner direction facing the wearer, and an orientation The outer direction opposite to the inner direction; and the outer body are disposed outside the absorbent body; and include a crotch region located in the crotch portion of the wearer and disposed in the crotch region The front front abdominal region and the rear abdominal region disposed in the rear of the crotch region, the absorbent body having a pair of curved portions located on the outer side in the width direction from the center in the width direction of the absorbent body And forming the absorber in a convex shape in the outer direction, wherein the outer body is provided with a plurality of elastic members, and the plurality of elastic members have a straight portion and are formed as a straight line extending in the width direction And the curved portion is located on the outer side in the width direction of the straight portion, and is formed from the inner side in the width direction toward the outer side in the width direction a curved line extending outward in the front-rear direction from the inner side in the front-rear direction, a linear portion of the elastic member is superposed on the pair of curved portions of the absorber, and a curved portion of the elastic member is disposed in a width direction of the absorber On the outer side, the stretch ratio of the curved portion of the elastic member is higher than the stretch ratio of the straight portion of the elastic member. The absorbent article according to claim 1, wherein the linear portion is disposed rearward of the center of the absorbent body in the front-rear direction and overlaps the absorbent body. The absorbent article according to claim 1 or 2, wherein the absorbent body has an inclined region in which a length in the width direction of the absorbent body is increased from a central portion in the front-rear direction of the absorbent body toward the outer side in the front-rear direction. The straight portion of the member overlaps the inclined region of the absorber. The absorbent article according to claim 1 or 2, wherein the curved portion is formed by a slit formed in the slit of the absorbent body or compressed in the thickness direction of the absorbent body, and the absorbent system is provided with a central absorbent portion. The central absorption portion is disposed between the pair of curved portions in the width direction, and does not have the curved portion. The absorbent article according to claim 1 or 2, wherein the pair of curved portions are disposed along the front-rear direction.