JP6214955B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper.

  Conventionally, an absorbent body having a front waistline region, a back waistline region, and a crotch region, extending over the front waistline region and the back waistline region across the inseam region, and a fastening tape that fastens the front waistline region and the back waistline region, A disposable diaper provided is known (for example, see Patent Document 1).

  Generally, the fastening tape is extended in the width direction outer side from the width direction outer side edge part of the back waist area of a disposable diaper. When wearing the disposable diaper of Patent Document 1, the fastening tape of the rear waistline region is pulled to the front waistline region with the crotch part of the disposable diaper arranged at the inseam of the wearer, and the fastening tape is fixed to the front waistline region To do.

  Moreover, the elastic member which expands-contracts in the width direction is arrange | positioned at the waist opening part of the disposable diaper of patent document 1. As shown in FIG. The waist opening of the disposable diaper is closely attached to the wearer's waist by the expansion and contraction of the elastic member.

JP 2006-20665 A

However, the above-mentioned disposable diaper has the following problems.
The disposable diaper of patent document 1 is provided with the elastic member located in the stomach side, and the elastic member located in the back side. Since this elastic member expands and contracts in the width direction, the waist opening of the disposable diaper fits around the waist of the wearer. The length in the front-rear direction of the elastic member on the back side and the length in the front-rear direction of the elastic member on the abdomen side are constant. Therefore, a certain area | region closely_contact | adheres to a wearer's waist circumference from a waist opening part.

  However, in general, the back side of the wearer is not flat but curved because the buttocks overhang. When a certain region is brought into close contact with the curved wearer's body in a planar shape from the waist opening, a part thereof may float or a part thereof may adhere too much.

  Then, this invention is made | formed in view of such a condition, and it aims at providing the disposable diaper which can be arrange | positioned along the swelling of a wearer's buttocks.

  A disposable diaper according to the present disclosure (disposable diaper 10) is located between a front waistline region (front waistline region 20), a rear waistline region (rear waistline region 30), and the front waistline region and the rear waistline region. Inseam area (inseam area 25), product longitudinal direction from the front waistline area to the rear waistline area (product longitudinal direction L), product width direction orthogonal to the product longitudinal direction (product width direction W), and It straddles the crotch region and extends to at least one of the front waistline region and the rear waistline region, and is disposed at an outer end portion in the product width direction of the rear waistline region, and an absorbent body (absorbent body 40) having an absorbent core. A disposable diaper comprising: a pair of fastening tapes (fastening tape 90) fastened to the front waistline region; and a waist elastic sheet straddling a product width direction center of the disposable diaper and having elasticity in the product width direction. There, The waist elastic sheet has a rear waist elastic sheet (rear waist elastic sheet 85) disposed in the rear waistline region, and a front end (front end 85F) of the rear waist elastic sheet is The rear end portion of the rear waist elastic sheet (rear end portion 85R) is disposed on the outer side in the product longitudinal direction than the absorbent core, The gist of the front side end portion of the rear waist elastic sheet is that the center of the product width direction is recessed more outward in the product longitudinal direction than in the product width direction outside in the extended state where the disposable diaper is extended. .

  According to this indication, the disposable diaper which can be arranged along the swelling of a wearer's buttocks can be provided.

It is an expansion | deployment top view of the expansion state of the disposable diaper which concerns on this embodiment. It is a top view of a natural state of a part of disposable diaper concerning this embodiment. It is sectional drawing of the disposable diaper along the F1-F1 line | wire shown in FIG. It is sectional drawing of the disposable diaper along the F2-F2 line | wire shown in FIG. It is a figure which shows the state which mounted | wore the wearer with the disposable diaper which concerns on this embodiment. It is the figure which showed typically the deformation | transformation state of a rear side waist elastic sheet.

  Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

(1) Overall schematic configuration of disposable diaper FIG. 1 is a developed plan view of a disposable diaper 10 according to the present embodiment in an expanded state. FIG. 2 is a plan view of a natural state of a part (rear end portion side) of the disposable diaper according to the present embodiment. FIG. 3 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in FIG. FIG. 4 is a sectional view of the disposable diaper along the line F2-F2 shown in FIG.

  The stretched state shown in FIG. 1 is a state where the elastic members 81 of the leg stretchable part 75 and the leg side gathers 80 are stretched until the top sheets 50 and the side flaps 70 constituting the disposable diaper are not formed. On the other hand, in the natural state, when the disposable diaper 10 is sealed in a package or the like, the disposable diaper 10 is removed from the package and left in that state for 12 hours in an atmosphere of 20 ° C ± 2 ° C and relative humidity 60% ± 5% RH. It is in the state. In a disposable diaper in a natural state, a ridge is formed on the top sheet 50, the side flap 70, and the like constituting the disposable diaper.

  The disposable diaper 10 is a tape-type disposable diaper. With the tape type, the outer end of the front waistline in the product width direction and the outer end of the rear waistline in the product width direction are not joined before use, but are joined by fastening members such as fastening tape during use. A diaper.

  The disposable diaper 10 has a front waistline region 20, a crotch region 25, and a rear waistline region 30. The front waistline region 20 is a portion in contact with the wearer's front waistline portion (abdomen portion). Further, the rear waistline region 30 is a portion in contact with the rear waistline portion (back portion) of the wearer. The crotch region 25 is located between the front waistline region 20 and the back waistline region 30.

  In the present embodiment, a direction from the front waistline region 20 to the rear waistline region 30 is referred to as a product longitudinal direction L, and a direction orthogonal to the product longitudinal direction L is referred to as a product width direction W.

  The disposable diaper 10 includes an absorbent body 40 that straddles the crotch region 25 and extends from the crotch region 25 toward at least one of the front waistline region 20 and the rear waistline region 30. The absorber 40 includes an absorbent core 40a and a core wrap 40b.

  The absorbent core 40a is the same as a conventional disposable diaper, and can be appropriately configured using a known member or material such as pulverized pulp or a superabsorbent polymer. The absorbent core 40a is wrapped with a sheet-like core wrap 40b.

The core wrap 40b is a sheet that covers the absorbent core 40a. At least a part on the skin surface side of the core wrap 40b is constituted by various fiber nonwoven fabrics or tissue sheets having liquid permeability. For example, air-through nonwoven fabric of weight approximately 10 to 30 g / m ^2, spun bond nonwoven fabric, SMS can be used (spunbond - spunbond - meltblown) nonwoven or tissue sheet mass about 10 to 30 g / m ^2,.

  The absorber 40 in the rear waistline region is provided with a low-rigidity portion 110 as a low-rigidity region that has a lower basis weight than other parts of the absorber or does not have the absorbent core 40a. The low-rigidity portion 110 has a shape in which the length in the product width direction gradually decreases from the product width direction center of the end portion on the rear waist region side of the absorber 40 toward the front waist region side. More specifically, it has a wedge shape in a plan view of the disposable diaper. Further, the boundary between the absorbent core 40a and the low-rigidity portion 110 is formed by an arc that is convex toward the center in the product width direction W. The absorber 40 on the outer side in the product width direction than the low-rigidity portion 110 has a trapezoidal shape that is convex toward the end on the rear waistline region side.

  A liquid-permeable top sheet 50 is provided on the surface side (skin contact surface side) of the absorber 40. A liquid-impermeable back sheet 60a is provided on the back side (non-skin contact surface side) of the absorber 40. An exterior sheet 60 is provided on the back surface side (non-skin contact surface side) of the back sheet 60a.

  The back sheet 60a is disposed on the inner side in the product longitudinal direction from the front end portion 10F of the disposable diaper and on the inner side in the product longitudinal direction from the rear side end portion 10R of the disposable diaper. The back sheet 60a is disposed on the inner side in the product width direction than the end portion of the disposable diaper in the product width direction. The exterior sheet is disposed on the non-skin contact side surface of the disposable diaper. The exterior sheet is made of, for example, a nonwoven fabric.

  Side flaps 70 are respectively provided on the side edges of the absorbent body 40 in the product width direction W. The side flap 70 straddles the front waistline region 20, the crotch region 25, and the rear waistline region 30, and is disposed outside the absorbent body 40 in the product width direction. The side flap 70 is comprised by the nonwoven fabric which piled up the 1 sheet or 2 or more sheets.

  A pair of leg openings 35 are formed in the side flap 70 of the disposable diaper 10. The leg opening 35 is provided at a side end portion in the product width direction of the disposable diaper, and is a portion that is disposed around the leg of the wearer while the disposable diaper is worn by the wearer. The leg opening 35 is recessed toward the center of the absorbent main body in the product width direction.

  The pair of side flaps 70 are each provided with a fastening tape 90. The fastening tape 90 is disposed at the outer end of the rear waistline region in the product width direction, and is fastened to the front waistline region. The fastening tape 90 extends outward from the side flap 70 in the product width direction. In the rear waistline region 30, the disposable diaper 10 is held on the wearer's body by extending along the product width direction W and being fixed to the non-skin contact surface of the front waistline region 20.

  The target portion 95 is disposed on the non-skin contact surface in the front waistline region, and is configured so that the pair of fastening tapes 90 are respectively fastened.

  In the present embodiment, the front waistline region 20, the rear waistline region 30, and the fastening tape 90 constitute a waistline holding portion. The waistline holding portion of the rear waistline region 30 is a range extending in the product width direction from the region where the engaging portion of the fastening tape 90 is provided. The waistline holding portion of the front waistline region 20 is a range extending in the product width direction from the region where the target portion 95 is provided.

  The side flap 70 is provided with a pair of leg stretchable parts 75 that are disposed on the inner side in the product width direction than the leg opening 35 and on the outer side in the product width direction with respect to the absorber 40 and that can be stretched in the product longitudinal direction L.

  The leg expansion / contraction part 75 should just be comprised so that the leg opening part 35 can be expanded-contracted in a product longitudinal direction, may be arrange | positioned along the leg opening part 35, and one part is with respect to the leg opening part 35. And may be arranged in an inclined state.

  Further, on the outer side in the product width direction with respect to the leg stretchable part 75, a pair of auxiliary stretchable parts 77 that are disposed across the crotch region 25 and the rear waistline region 30 and stretch in the product longitudinal direction are disposed. By contracting the region of the side flap 70 where the auxiliary elastic part 77 is provided, the side flap 70 can be along the buttocks of the swelled wearer, and the region can cover the buttocks.

  Note that the leg elastic part 75 and the auxiliary elastic part 77 are parts that are substantially contracted in the product longitudinal direction by an elastic member such as rubber thread, and a concept excluding a part where the elastic member is disposed in a state where the contracting force is not exerted. It is.

  The leg expansion / contraction part 75 is comprised by three elastic members per one side which expand-contracts in a product longitudinal direction. The auxiliary expansion / contraction part 77 is constituted by one elastic member per one side that expands and contracts in the product longitudinal direction. The elastic member according to the present embodiment is made of polyurethane elastic fiber or natural rubber.

  The rear end 75R of the leg stretchable part 75 is disposed in front of the fastening tape 90 and on the inner side in the product width direction of the fastening tape. Therefore, the leg expansion / contraction part 75 contracts the front side of the fastening tape 90 and the inner side in the width direction.

  The front end 77F of the auxiliary expansion / contraction part 77 is disposed on the rear side of the front end 75F of the leg expansion / contraction part 75. Therefore, the region behind the front end portion 75F of the leg stretchable portion 75 is shrunk by the auxiliary stretchable portion 77. The rear end 77R of the auxiliary stretchable part 77 is arranged on the rear side of the rear end of the leg stretchable part. Therefore, the area behind the leg expansion / contraction part 75 contracts by the auxiliary expansion / contraction part 77.

  The leg stretchable part 75 can raise the crotch region of the disposable diaper toward the wearer's crotch. Further, the force pulled up by the leg stretchable part can be transmitted to the fastening tape 90 by the auxiliary stretchable part 77. Therefore, in a state where the fastening tape 90 is fastened, not only the region held around the waist of the wearer by the fastening tape 90 and the region where the leg stretchable portion 75 is disposed, but also between the fastening tape 90 and the leg stretchable portion 75. It becomes easy to make an area | region adhere to a wearer.

  Furthermore, the area | region outside a leg width direction can be shrunk by an auxiliary | assistant expansion-contraction part, and a collar part can be appropriately covered with the side flap of a back waist area. Thus, in particular, turning over when wearing the rear leg opening can be suppressed. Moreover, a leg opening part can be drawn toward the body side by shrinkage | contraction of a leg expansion-contraction part, and the shift | offset | difference of a leg opening part can be suppressed.

  The leg expansion / contraction part 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in a region where the back sheet 60a disposed between the absorber 40 and the exterior sheet 60 is provided, the leg stretchable part 75 is disposed between the back sheet 60a and the side flap 70.

The elongation ratio of the leg stretchable part 75 is preferably 1.7 to 2.4 times. In the present embodiment, the extension rate of the leg stretchable part 75 is set to 1.9 to 2.2 times. The elongation rate means the degree of elongation of the leg stretchable part, and is defined as follows.
Stretch rate of leg stretchable part = (length of stretchable leg stretched part) ÷ (length of leg stretchable part in natural state)

Moreover, it is preferable that the expansion rate of the auxiliary | assistant expansion-contraction part 77 is 1.6 to 2.4 times. The extension rate of the auxiliary stretchable part 77 means the degree of extension of the auxiliary stretchable part, and is defined as follows.
Elongation rate of auxiliary expansion / contraction part = (length of auxiliary expansion / contraction part in the extended state) / (length of auxiliary expansion / contraction part in the natural state)

In addition, in this specification, this elongation rate shall be measured as follows, for example.
1stly, when the disposable diaper 10 is enclosed with the package etc., the disposable diaper 10 is taken out from a package. Subsequently, the arrangement | positioning area | region of measurement objects, such as a leg expansion-contraction part, is cut out. At this time, it cuts out also including the exterior sheet | seat with which measurement objects, such as a leg expansion-contraction part, are joined. The elongation rate of the sample after cutting is measured, and the elongation rate of the measurement object is measured.

  Each sample is left for 60 minutes in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH, and the length of the object to be measured is measured along the stretching direction. This length is defined as “the length of a natural state measurement target (such as a leg stretchable part)”.

Secondly, the length in the stretch direction of the desired region in such a state (that is, the natural state), and the desired state when stretched from the natural state to a state where wrinkles due to the elastic member cannot be visually confirmed on the non-stretchable sheet Measure the length of the region in the stretch direction. This length is defined as “the length of the measurement target (eg, leg stretchable part) in the extended state”.
Using these measurement results, the elongation percentage is measured by calculating with the above formula.

Note that the measurement of “length” in this specification is performed by the following measurement method.
When the disposable diaper 10 is sealed in a package or the like, a sample that is taken out from the package and left in an atmosphere of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used.

Next, using a spring measure (tape: glass fiber-containing polyvinyl chloride coating) manufactured by Shinwa Measurement Co., Ltd., the length of this state of the measurement target part is measured so as to be along the measurement target part. Further, the length of the stretched state is measured by measuring the length of the measurement target portion when the disposable diaper 10 is stretched from a natural state to a state where wrinkles due to the elastic member cannot be visually confirmed.
Here, with respect to 10 samples, the above-described measurement was performed in each state, and the average value was defined as the length.

  A pair of leg side gathers 80 extending along the product longitudinal direction L are provided inside the pair of leg stretchable portions 75 (near the center in the product width direction W). The leg side gathers 80 are provided at the inner end of the side flap 70 in the product width direction, and are erecting and expanding gathers disposed on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 are arranged on the inner side in the product width direction than the leg stretchable parts 75. The leg side gathers 80 can adopt a conventionally well-known configuration. Specifically, the leg side gathers 80 may be formed of a sheet material different from the side flaps 70.

  The disposable diaper 10 has a waist elastic sheet that straddles the center of the disposable diaper in the product width direction and has elasticity in the product width direction. The waist elastic sheet has a rear waist elastic sheet 85 disposed at the rear end of the disposable diaper and a front waist elastic sheet 86 disposed at the front end of the disposable diaper. In addition, in FIG. 1, the virtual line L1 which passes along the product width direction center of a disposable diaper and extends in a product longitudinal direction is shown.

  The rear end portion 10R of the disposable diaper has a curved shape in which the product width direction center of the rear end portion 10R is recessed in the product longitudinal direction inner side than the product width direction outer side of the rear end portion 10R in the natural state of the disposable diaper. . The rear end portion of the rear waist elastic sheet 85 located at the rear end portion of the disposable diaper also has a curved shape in which the center in the product width direction is recessed in the product longitudinal direction inner side than the product width direction outer side in the natural state.

  In the extended state where the disposable diaper is extended (the state shown in FIG. 1), the front end 85F of the rear waist elastic sheet 85 has a product width direction center of the front end 85F in the product width direction of the front end 85F. It has a curved shape that is recessed outward in the product longitudinal direction from the outside. The curved shape of the rear waist elastic sheet is not formed in the entire front end portion 85F, but is formed in the center in the width direction which is a part of the front end portion.

  The rear waist elastic sheet 85 is disposed between a pair of fastening tapes in the product width direction. A part of the front end portion 85F of the rear waist elastic sheet 85 overlaps the absorbent core. The rear end 85R of the rear waist elastic sheet 85 is disposed on the outer side in the product longitudinal direction from the absorbent core 40a and coincides with the rear end of the disposable diaper. The length of the rear waist elastic sheet 85 in the product width direction is longer than the length of the absorbent body 40 in the product width direction, and is longer than the length of the back sheet 60a in the width direction. The rear waist elastic sheet extends outward from the absorbent body 40 in the product width direction, and extends outward from the back sheet 60a in the product width direction.

  In the extended state of the disposable diaper, the product longitudinal direction length D1 at the center in the product width direction of the rear waist elastic sheet is shorter than the product longitudinal direction length D2 at the product width direction outer end of the rear waist elastic sheet. In addition, the product width direction center of a back side waist elastic sheet corresponds with the product width direction center of a disposable diaper. The difference between D1 and D2 is 15 mm. Therefore, in the extended state, the distance between the front side end in the product width direction center of the rear waist elastic sheet and the front side end in the product width direction of the rear waist elastic sheet is 15 mm.

  The basis weight at the product width direction center of the rear waist stretchable sheet is higher than the basis weight at the outer end of the rear waist stretchable sheet in the product width direction. The said fabric weight is a fabric weight of the elastic sheet which comprises a waist elastic sheet.

  The front side edge part in the product width direction center of a rear side waist elastic sheet is arrange | positioned in a trunk periphery holding part. The front side edge part in the product width direction center of a rear waist elastic sheet is located back rather than the front side edge part of the trunk periphery holding part in a rear waist area. Thus, the waistline holding portion has a portion that overlaps the rear waist elastic sheet and a portion that does not overlap the rear waist elastic sheet. Moreover, the front side edge part in the width direction outer side edge part of a rear side waist elastic sheet is extended ahead rather than the trunk periphery holding part.

  In the natural state of the disposable diaper, the front end portion 10F of the disposable diaper has a curved shape in which the center of the front end portion 10F in the product width direction is recessed more inward in the product longitudinal direction than in the product width direction outer side of the front end portion 10F. The front end 86F of the front waist elastic sheet 86 located at the front end of the disposable diaper is also longer than the outside in the product width direction of the front end 86F in the product width direction center of the front end 86F in the natural state of the disposable diaper. It has a curved shape that is recessed inward.

  In the extended state where the disposable diaper is extended (the state shown in FIG. 1), the rear end 86R of the front waist elastic sheet 86 is a product whose center in the product width direction of the rear end 86R is the rear end 86R. It has a curved shape that is recessed outward in the longitudinal direction of the product than outside in the width direction. The curved shape of the front waist elastic sheet is not formed in the entire rear end 86R, but is formed in the center in the width direction which is a part of the rear end 86R.

  The rear end portion 86R of the front waist elastic sheet 86 is adjacent to the absorber 40 and adjacent to the target portion 95 in the product longitudinal direction. The rear end portion 86R of the front waist elastic sheet 86 is located outside the absorber 40 and outside the target portion 95 in the product longitudinal direction.

  The front end 86F of the front waist elastic sheet 86 coincides with the front end of the disposable diaper. The length of the front waist elastic sheet 86 in the product width direction is longer than the length of the absorbent body 40 in the product width direction, and is longer than the length of the back sheet 60a in the width direction. The front waist elastic sheet 86 extends outward from the absorber 40 in the product width direction, and extends outward from the back sheet 60a in the product width direction.

  In the present embodiment, it is preferable that the waist stretchable sheet is a sheet in which the width of the sheet in the second direction perpendicular to the extending direction becomes narrow (so-called width) when the sheet expands in one direction.

The waist stretchable sheet is a sheet made of a mixture of elastic fibers having elastic extensibility and non-elastic fibers having non-elastic extensibility, particularly a mass of ^{20 to} 80 g / m ² , more preferably 40 to 75 g / m ^2. A spunbonded nonwoven fabric having a mass of 50 to 70 g / m ² , wherein the elastic fiber is a filament of polyurethane fiber having a fineness of 2 to 6 dtex, and the inelastic fiber has a fineness of 2 to 6 dtex It is at least one filament of a polyolefin fiber, a polyester fiber, and a polyamide fiber having a weight mixing ratio of the elastic fiber and the non-elastic fiber in the range of 40:60 to 60:40 A spunbond nonwoven sheet can be used. The non-elastic fiber / elastic fiber non-woven fabric is stretched by breaking a part of the non-elastic fiber layer with a gear. As another waist elastic sheet, if it is a sheet with a width, it can be relatively easily formed into a width with this configuration. In addition, a waist elastic sheet is not restricted to a nonwoven fabric sheet, You may be comprised with the film sheet. It is also possible to use a sheet formed in advance so that the length of the stretchable sheet in the product changes in advance (cuts so as to be convex inward).

The elongation percentage of the rear waist elastic sheet 85 is preferably 1.4 to 1.8 times. In the present embodiment, the extension rate of the rear waist elastic sheet 85 is set to 1.5 to 1.6 times. The elongation rate means the degree of elongation of the rear waist elastic sheet, and is defined as follows.
Elongation ratio of rear waist elastic sheet = (length of rear waist elastic sheet in the extended state) ÷ (length of rear waist elastic sheet in the natural state)

The elongation ratio of the front waist elastic sheet 86 is preferably 1.3 to 1.7 times. In the present embodiment, the stretch rate of the front waist elastic sheet 86 is set to 1.4 to 1.6 times. The elongation rate means the degree of elongation of the front waist elastic sheet, and is defined as follows.
Elongation ratio of front waist elastic sheet = (length of front waist elastic sheet in the extended state) ÷ (length of front waist elastic sheet in the natural state)

  In this embodiment, the waist elastic sheet is disposed between the exterior sheet 60 and the back sheet 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction from the absorbent core 40a, the waist stretchable sheet is disposed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. Also good. The position of the waist elastic sheet is not particularly limited. Further, in a region where the absorbent body is not disposed, it may be disposed between the side flap 70 and the back sheet 60a or the exterior sheet 60.

  The rear waist elastic sheet 85 is disposed so as to overlap a part of the low-rigidity portion 110 of the absorbent body in a plan view of the disposable diaper. In the present embodiment, the rear waist elastic sheet 85 is disposed so as to overlap a part of the low rigidity portion 110, but the entire rear waist elastic sheet 85 is disposed so as to overlap. May be.

  By forming such a low rigidity portion 110, the expansion and contraction of the rear waist elastic sheet 85 is not hindered, and even if the rear waist elastic sheet 85 contracts, the low rigidity portion 110 narrows and the low rigidity portion Since the gap between the absorbent bodies on both sides in the product width direction is narrower than 110, the absorbent body 40 is unlikely to rise in an unintended shape. The low-rigidity portion 110 is preferably narrower than the width of the rear waist elastic sheet 85 in consideration of prevention of excrement leakage.

  In addition, although the waist elastic sheet which concerns on this embodiment is comprised so that it may expand-contract in a product width direction, you may be comprised so that a waist elastic sheet may expand-contract in a product width direction and a product longitudinal direction.

  The fastening tape 90 is attached to the region of the side flap 70 corresponding to the rear waistline region 30. The fastening tape 90 is provided with a base sheet 91 connected to the side flap 70, an engagement hook (not shown) as a plurality of engagement members, and a hook sheet 92 fixed to the base sheet 91; Is provided. The hook sheet 92 is an area where an engagement member is provided, and the waistline holding portion in the above-described rear waistline area is an area extending from the hook sheet 92 in the product width direction.

  The hook sheet 92 is fixed to the base sheet 91, specifically, joined. The hook sheet 92 and the base sheet 91 are preferably joined so that the rigidity of the fastening tape 90 does not become higher than necessary. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a hot melt adhesive applied intermittently such as a dot shape, a line shape, or a spiral shape. The hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.

The base sheet 91 is composed of one or two or more non-woven fabrics stacked. As the base material sheet 91, a nonwoven fabric produced by a production method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used. The basis weight of the nonwoven fabric constituting the base sheet 91 (total basis weight in the case of a plurality of sheets) is 30 to 120 g / m ² , preferably 40 to 90 g / m ² .

  The fastening tape includes a base portion 93 that overlaps the exterior sheet and an extending portion 94 that extends outward in the product width direction from the exterior sheet. The base portion 93 is a portion of the base sheet 91 that overlaps the exterior sheet in a state where the fastening tape is developed. The extending portion 94 is a portion of the base sheet 91 that does not overlap the exterior sheet. In the extended state of the disposable diaper shown in FIG. 1, the product longitudinal direction center of the extension part coincides with the product longitudinal direction center of the base part in the product longitudinal direction. However, in the natural state of the disposable diaper, the position of the fastening tape changes with the curvature of the rear waist elastic sheet 85, and the product longitudinal center of the extension is outside the product longitudinal center of the base. Located in.

  In the present invention, the state in which the members overlap is a concept including not only a state in which the members directly overlap but also a state in which the members indirectly overlap (a state in which other members overlap).

  The target portion 95 is provided on the surface on the non-skin contact side of the exterior sheet 60 in the front waistline region. The target portion 95 is configured so that the engaging hook of the fastening tape is hooked, and functions as a loop of a hook and loop locking system. As the target portion, for example, an air-through nonwoven fabric can be used.

  As the target portion 95, for example, a fiber nonwoven fabric made from a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used. Further, the loop attached to the target portion can be formed of a polyolefin-based thermoplastic synthetic resin.

  Furthermore, as the target portion 95, a non-woven fabric which is a bulky non-woven fabric and which is partly embossed to prevent fluffing on the non-woven fabric surface may be used.

  Further, the exterior sheet 60 of the disposable diaper is formed of non-woven fabric, and the design indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the non-skin contact side surface of the exterior sheet 60, or the design sheet is printed on the back sheet. It can also be set as the target portion by arranging it on the non-skin contact side of 60a or the exterior sheet 60.

  Subsequently, the wearing state of the disposable diaper comprised in this way is demonstrated. When wearing the disposable diaper, the wearing assistant pulls the fastening tape in the rear waistline region toward the front waistline region. The wearing assistant attaches the fastening tape to the target portion in a state where the fastening tape is drawn to the front waistline region.

  In FIG. 5, the state which mounted | wore the wearer with the disposable diaper of this Embodiment is shown. Drawing 5 is a figure which looked at a wearer in the state where a disposable diaper was equipped from the back side. In the state in which the disposable diaper is extended, the front end 85F of the rear waist elastic sheet has a curved shape in which the center in the product width direction is recessed outward in the product longitudinal direction from the outside in the product width direction. The front end of the rear waist elastic sheet is arranged around the bulge of the buttock while avoiding the bulge of the wearer's buttock.

  The rear end of the disposable diaper is pulled in the width direction by pulling the fastening tape to the area around the front waistline at the time of wearing. FIG. 6 is a diagram showing a deformation mode of the rear waist elastic sheet when the rear waistline region of the disposable diaper is pulled in the width direction via the fastening tape. (A) has shown the state before a deformation | transformation, (b) is the state pulled to the product width direction outer side from (a), (c) is the state which further pulled the fastening tape.

  In the state before deformation shown in FIG. 6A, the rear end of the disposable diaper is curved such that the center in the product width direction of the rear end is recessed more inward in the product longitudinal direction than in the product width direction outside of the rear end. Shape. Moreover, in the state before a deformation | transformation, the front side edge part of a back side waist elastic sheet is a curved shape where the product width direction center of a front side edge part is dented in the product longitudinal direction outer side rather than the product width direction outer side of a front side edge part.

  When the fastening tape is pulled slightly outward in the width direction from the state before deformation, the state shown in FIG. 6B is obtained. By pulling the fastening tape around the front waistline, the rear end of the disposable diaper is pulled in the width direction. Even in this state, the rear side end portion of the disposable diaper has a curved shape in which the center in the product width direction of the rear side end portion is recessed more inward in the product longitudinal direction than the outer side in the product width direction of the rear side end portion. Moreover, the front side edge part of a back side waist elastic sheet is the curved shape where the product width direction center of a front side edge part dents in the product longitudinal direction outer side rather than the product width direction outer side of a front side edge part.

  When the fastening tape is pulled slightly outward in the width direction from the state shown in FIG. 6B, the state shown in FIG. 6C is obtained. The rear end of the disposable diaper is substantially parallel to the product width direction. The front end portion of the rear waist elastic sheet has a curved shape in which the center in the product width direction of the front end portion is recessed outward in the product longitudinal direction from the outer side in the product width direction of the front end portion.

  The front side end portion of the rear waist elastic sheet is disposed in the vicinity of the bulging portion of the collar portion. The bulge shape of the heel portion is a shape in which the left and right heel portions bulge, and the bulge shape is less toward the side than the left and right heel portions. That is, in the state where the wearer's body is visually recognized from the back side, the center in the width direction rises due to the bulges of the left and right buttocks, and the bulges decrease toward the side portions on the outer side in the width direction.

  Since the front end of the rear waist elastic sheet has a curved shape in the extended state, the center in the width direction of the front end of the waist elastic sheet is positioned on the outer side in the longitudinal direction than the outer end in the width direction. Therefore, the center in the width direction of the rear waist elastic sheet can be arranged so as to avoid the swelling of the buttocks. A disposable diaper can be arrange | positioned along a curvilinear wearer's body by providing a waist elastic sheet in a curved shape.

  Moreover, the rear side edge part of a rear side waist elastic sheet is arrange | positioned in the longitudinal direction outer side rather than the absorptive core. By contraction of the rear waist elastic sheet, the vicinity of the waist opening beyond the absorber can be fitted to the body.

(2) Manufacturing method of disposable diaper Next, an example of the manufacturing method of the disposable diaper which concerns on this embodiment is demonstrated. In addition, about the method which is not demonstrated in this embodiment, the existing method can be used. Moreover, the manufacturing method demonstrated below is an example and can also be manufactured with another manufacturing method. The manufacturing method of a disposable diaper includes at least a component forming process, a component placing process, a leg-hole forming process, and a cutting process.

  The manufacturing method of a disposable diaper manufactures the continuous body in which the disposable diaper is continuous in the product longitudinal direction, and cuts the continuous body into the size of one product along the product width direction W. Produce diapers.

  In the component forming process, the components constituting the disposable diaper are formed. Specifically, for example, the absorbent body 40 is molded by laminating absorbent materials.

  In the component mounting step, on the continuous web constituting the back sheet, the waist elastic sheet, other webs such as the continuous web constituting the top sheet, the absorbent body, the leg elastic part 75, the auxiliary elastic part 77, etc. The components constituting the disposable diaper 10 are placed.

  At this time, the waist elastic sheet is a state in which the front waist elastic sheet 86 of any disposable diaper and the rear waist elastic sheet 85 of the disposable diaper adjacent to the arbitrary disposable diaper are integrated. Hold both ends of the elastic sheet (the part that will be the outer edge in the product width direction when molded into a disposable diaper) with suction means, etc., and extend the elastic sheet in the product width direction of the disposable diaper to continue Affix on the web. Since the stretchable sheet is stretched in a state where both ends of the stretchable sheet are held, both ends of the stretchable sheet hardly stretch. The elongation rate in the product width direction of both ends of the stretchable sheet is lower than the elongation rate in the product width direction of the region between the both ends.

  Specifically, three sections having different elongation rates are formed in the region where the waist elastic sheet of the disposable diaper is arranged. The center of the product width direction of the area where the waist elastic sheet is arranged is the central area, and the end part of the product width direction of the area where the waist elastic sheet is arranged (corresponding to both ends of the waist elastic sheet) is the side area. When the region between the side region and the side region is defined as an intermediate region, the relationship between the elongation rate is as follows: elongation rate in the product width direction of the central region> elongation rate in the product width direction of the intermediate region> elongation rate of the side region It is.

  The elongation ratio in the product width direction of the central region can be 1.4 to 1.8. The expansion rate in the product width direction of the side region is set lower than the expansion rate in the product width direction of the central region, and can be 1.0 to 1.1 times. The elongation rate in the product width direction of the intermediate region is set lower than the elongation rate in the product width direction of the central region and higher than the elongation rate of the side region, and may be 1.2 times to 1.3 times. it can. It should be noted that the side region may be a region where the expansion rate in the product width direction is 1.0 times and the side region does not substantially extend.

  Moreover, the elastic sheet extended | stretched in the product width direction enters width in a product longitudinal direction. In particular, the product width direction center of the stretchable sheet has a width. Therefore, in the stretchable stretch sheet, the length in the product longitudinal direction at the center in the product width direction is shorter than the length in the product longitudinal direction at the end in the product width direction. As shown in FIG. 1, the stretchable sheet affixed in a state where the width is included is a rear end portion and a rear waist stretchable portion of the front waist stretchable sheet corresponding to the end portion in the product longitudinal direction of the stretchable sheet. The front end of the sheet has a curved shape in which the center in the width direction is recessed from the outside in the width direction.

  In the leg periphery forming step, the top sheet 50, the exterior sheet 60, and the back sheet 60a are cut. As a result, the front end 77F of the auxiliary telescopic part 77 is cut, and the leg opening 35 is formed around the wearer's leg.

  In the cutting step, the continuous body on which the top sheet 50, the back sheet 60a, the absorber 40, and the like are arranged is cut into the size of one product along the product width direction W. Thereby, the disposable diaper 10 is manufactured.

  When the continuous body is cut for each product, the stretched state of the waist stretchable sheet and the leg stretchable portion provided in the disposable diaper is released, and a natural state is obtained. When the extended state is released, the waist stretchable sheet that is in the width state at the time of expansion is deformed so as to return to the state before the width is entered. Therefore, although the rear side edge part of the rear side waist elastic sheet and the front side edge part of the front side waist elastic sheet were linear in the expansion | extension state, it deform | transforms into a curved state in a natural state.

  Moreover, when a continuous body is cut | disconnected for every product and it will be in a natural state, the front side edge part of a front waist elastic sheet shrinks rather than the rear side edge part of a front waist elastic sheet, and the back side of a rear waist elastic sheet The end portion contracts more than the front end portion of the rear waist elastic sheet. The front end of the front waist stretchable sheet is farther from the absorbent core 40a than the rear end of the front waist stretchable sheet and contracts because the rigidity of the absorbent core 40a is not affected. The rear end portion of the rear waist elastic sheet is farther from the absorbent core 40a than the front end portion of the rear waist elastic sheet, and contracts because the rigidity of the absorbent core 40a is not affected.

  The front end of the front waist elastic sheet contracts more than the rear end of the front waist elastic sheet so that the center of the front end of the disposable diaper is in the product width direction outside of the front end of the disposable diaper. It becomes a curved shape that is recessed more inward in the product longitudinal direction. Similarly, when the rear end of the rear waist elastic sheet contracts more than the front end of the rear waist elastic sheet, the center in the product width direction of the rear end of the disposable diaper is the rear side of the disposable diaper. It becomes a curved shape which is dented in the product longitudinal direction inner side rather than the product width direction outer side of an edge part.

(3) Action / Effect Since the front end of the rear waist elastic sheet has a curved shape in the extended state, the center in the width direction of the front end of the waist elastic sheet is positioned on the outer side in the longitudinal direction than the outer end in the width direction. . Therefore, it arrange | positions so that the swelling of the waist part may be avoided in the width direction center of a waist elastic sheet, and a back side waist elastic sheet can be arrange | positioned along the swelling of a wearer's buttocks.

  In addition, since the low-rigidity portion is provided in the absorbent body 40, the rear end portion of the absorbent body is easy to expand in the width direction, and the rear end portion of the rear waist elastic sheet is widened when being attached. It can be further extended easily.

  In the extended state of the disposable diaper, the product longitudinal length at the center of the rear waist elastic sheet in the product width direction is shorter than the product longitudinal length at the outer end of the rear waist elastic sheet in the product width direction. When the rear waist elastic sheet has a shorter length in the longitudinal direction at the center in the width direction than the outside in the product width direction, and the rear end of the rear waist elastic sheet is placed along the waist of the wearer In addition, the front end of the rear waist elastic sheet can be arranged so as to avoid the swelling of the buttock, and the part beyond the buttock can be fitted by the waist elastic sheet.

  In addition, the product width direction outer side edge part of a back side waist elastic sheet is a part hold | maintained when extending an elastic sheet in the manufacturing method of the above-mentioned disposable diaper. The product width direction outer side edge part of the said back side waist elastic sheet is not curved shape, and the length of a product longitudinal direction is constant.

  The waistline holding part that holds the disposable diaper on the wearer's body is a part that is in close contact with the wearer's body. Since the front end of the width direction center of the rear waist elastic sheet is disposed in the waistline holding part, the waist elastic sheet extends beyond the waistline holding part to the bulge side of the buttocks at the center of the width direction of the rear waist elastic sheet. Is not arranged, and the bulge of the buttock can be suppressed from being pressed against the covering portion.

  On the other hand, because the front end of the widthwise outer end of the rear waist elastic sheet extends to the front side rather than the waistline holding part, the waist elastic sheet is arranged beyond the waistline holding part, and the bulge of the buttock is less Can fit diapers against.

  The basis weight at the product width direction center of the rear waist stretchable sheet is higher than the basis weight at the outer end of the rear waist stretchable sheet in the product width direction. When the basis weight of the rear waist elastic sheet is high, the stress due to the rear waist elastic sheet becomes higher. The center in the width direction of the wearer's buttocks is a portion where a gap is more likely to be generated between the wearer's body and the disposable diaper than the side in the width direction of the wearer's buttocks. By increasing the stress at the center in the product width direction of the rear waist elastic sheet corresponding to the center in the width direction of the wearer's buttocks, the followability to the wearer's body can be enhanced.

(4) Other Embodiments As described above, the contents of the present invention have been disclosed through the embodiments of the present invention. However, it is understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. Should not. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In a modification, the disposable diaper may not have a front waist elastic sheet.

  In a modification, the rear side edge part of a back side waist elastic sheet may be arranged in the product longitudinal direction inside rather than the rear side edge part of a disposable diaper, without being in agreement with the rear side edge part of a disposable diaper.

  In the modification, the low rigidity region may not be formed in the absorber 40.

  In the modified example, in the extended state of the disposable diaper, the product longitudinal direction length at the product width direction center of the rear waist elastic sheet is the same as the product longitudinal direction length at the product width direction outer end of the rear waist elastic sheet. It may be longer than the product longitudinal direction length at the product width direction outer side end portion of the rear waist elastic sheet.

  In a modification, the front side edge part in the product width direction center of a back side waist elastic sheet does not need to overlap with the trunk periphery holding part. The front side end portion in the width direction outer side end portion of the rear waist elastic sheet is disposed in the waistline holding portion and may not extend to the front side.

  In a modification, the basis weight at the center of the product width direction of the rear waist elastic sheet may be the same as the basis weight at the outer end of the rear waist elastic sheet, or the product width of the rear waist elastic sheet. You may be lower than the fabric weight in a direction outer side edge part.

  In a modification, the back film may extend to the rear end of the disposable diaper, may extend to the front end of the disposable diaper, or may extend to the product width direction end of the disposable diaper. Good.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

10: disposable diapers
20: Front waist area
25: Inseam area
30: Rear waist area
35: Leg opening
40: Absorber
40a: Absorbent core
40b: Core wrap
50: Top sheet
60: exterior sheet
60a: Back sheet
70: Side flap
75: Leg stretchable part
75F: Front end
75R: Rear end
77: Auxiliary telescopic part
77F: Front end
77R: Rear end
80: Legside gather
81: Elastic member
85: Rear waist elastic sheet
85F: Front end
85R: Rear end
86: Front waist elastic sheet
86F: Front end
86R: Rear end
90: Fastening tape
91: Base sheet
92: Hook sheet
93: Base
94: Extension part
95: Target section
110: Low rigidity part
L: Product longitudinal direction
W: Product width direction

Claims (4)

A front waistline region, a back waistline region, a crotch region located between the front waistline region and the back waistline region;
Product longitudinal direction from the front waistline region to the rear waistline region,
A product width direction orthogonal to the product longitudinal direction;
Straddling the crotch region, extending to at least one of the front waistline region and the rear waistline region, an absorbent body having an absorbent core;
A pair of fastening tapes arranged at the outer end in the product width direction of the rear waistline region and fastened to the front waistline region;
A disposable diaper comprising a waist stretchable sheet straddling the product width direction center of the disposable diaper and having elasticity in the product width direction,
The waist elastic sheet has a rear waist elastic sheet arranged in the rear waistline region,
The front end of the rear waist elastic sheet is disposed so as to overlap the absorbent core,
The rear side end part of the back waist elastic sheet is arranged on the product longitudinal direction outside rather than the absorptive core,
It said front end of said rear waist stretchable sheet, in the above stretched state of being extended to disposable diapers, have a curved shape product widthwise center than the product width direction outside recessed in the product longitudinal direction outside,
The disposable diaper whose fabric weight in the center of the product width direction of the said back waist elastic sheet is higher than the fabric weight in the product width direction outer side edge part of the said back waist elastic sheet . The absorbent body is provided with a low rigidity area where the basis weight is lower than other parts of the absorbent body, or where the absorbent core is not present,
The disposable diaper according to claim 1, wherein the low-rigidity region has a shape in which a length in a product width direction is shortened from a center in a product width direction of a rear end portion of the absorber toward the front waistline region side.   In the extended state of the disposable diaper, the product longitudinal direction length at the product width direction center of the rear waist stretchable sheet is shorter than the product longitudinal direction length at the product width direction outer end of the rear waist stretchable sheet. The disposable diaper of Claim 1 or Claim 2. In the front waistline region and the rear waistline region, it extends along the product width direction, and includes a waistline holding portion that holds the disposable diaper on the wearer's body,
The front side end portion in the center of the product width direction of the rear waist elastic sheet is disposed in the waistline holding portion,
The disposable diaper in any one of Claims 1-3 in which the front side edge part in the said product width direction outer side edge part of the said back side waist elastic sheet is extended ahead rather than the said trunk periphery holding | maintenance part.

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