KR102312228B1 - Disposable diaper - Google Patents

Abstract

Disposable diaper 10 is disposed at the outer end of the product width direction of the back waist region, and a pair of fastening tapes 90 fixed to the front waist region, spanning the center of the product width direction of the disposable diaper, A waist elastic sheet having elasticity in the product width direction is provided. The waist elastic sheet has the rear side waist elastic sheet 85 arrange|positioned at the rear side edge part 10R of a disposable diaper. The rear end 10R of the disposable diaper has a curved shape in which the product width direction center is dented inward in the product longitudinal direction rather than the product width direction outside in the natural state of the disposable diaper.

Description

Disposable diapers {DISPOSABLE DIAPER}

The present invention relates to a disposable diaper.

Conventionally, an absorbent body having a front waist area, a back waist area, and a crotch area, spanning the crotch area and extending to the front waist area and back waist area, and a pass for fixing the front waist area and the back waist area A disposable diaper provided with a napkin is known (for example, refer patent document 1).

In general, the fastening tape extends outward in the width direction from the outer end in the width direction of the back waist region of the disposable diaper. When the disposable diaper of Patent Document 1 is put on, the fastening tape in the rear waist region is pulled to the front waist region in a state where the crotch portion of the disposable diaper is arranged on the wearer's crotch, and the fastening tape is applied to the front waist region. fasten on

Moreover, in the waist opening part of the disposable diaper of patent document 1, the elastic member which expands and contracts in the width direction is arrange|positioned. The waist opening of a disposable diaper is closely_contact|adhered to the waist circumference of a wearer by expansion-contraction of an elastic member.

Patent Document 1: Japanese Patent Laid-Open No. 2006-20665

Summary of invention

In general, infants and young children have a bulge around the abdomen. In order to adequately cover the bulge of the abdomen of the infant, it is contemplated for a mounting assistant to secure the fastening tape over the bulge of the abdomen. In a state in which the fastening tape is fixed on the bulge of the abdomen, the region extending in the width direction from the fastening tape is in close contact with the body of the wearer, and the waist opening is formed around the abdomen of the wearer by contraction of the elastic member in the width direction. are pitted

In the state in which the fastening tape is fixed on the bulge of the abdomen, the size of the region extending in the width direction from the fastening tape coincides with the circumference of the bulging abdomen of the wearer. However, the position of the disposable diaper may be shifted by the movement of the wearer. For example, when the fixing position of the fastening tape of the disposable diaper is shifted to the crotch side, the region extending in the width direction from the fastening tape is shifted from the bulge of the wearer's abdomen. Therefore, the dimension of the area|region extended in the width direction from the fastening tape becomes larger than the waist circumference of a wearer, and the position of a disposable diaper becomes more easy to shift.

Accordingly, the present invention has been made in view of such a situation, and an object of the present invention is to provide a disposable diaper that can adequately cover the bulge of the wearer's abdomen.

The disposable diaper (disposable diaper 10) according to the present disclosure includes a front waist region (front waist region 20), a back waist region (rear waist region 30), and the front waist region and a crotch region (crotch region 25) positioned between the rear waist region, and a product longitudinal direction from the front waist region to the rear waist region (product longitudinal direction (L)), and the product length An absorbent body (absorbent body 40) extending in the product width direction (product width direction (W)) orthogonal to the direction, spanning the crotch region, and extending in at least one of the front waist region and the rear waist region; , a pair of fastening tapes (fastening tapes 90) disposed at the outer end of the product width direction of the rear waist region and fixed to the front waist region and spanning the center of the product width direction of the disposable diaper, , The disposable diaper provided with a waist elastic sheet having elasticity in the product width direction, wherein the waist elastic sheet has a rear waist elastic sheet (rear waist elastic sheet 85) disposed at the rear end of the disposable diaper, and the rear end portion of the disposable diaper has a curved shape in which the product width direction center is dented inward in the product longitudinal direction rather than outside the product width direction in the natural state of the disposable diaper.

BRIEF DESCRIPTION OF THE DRAWINGS It is an expanded top view of the stretched state of the disposable diaper which concerns on this embodiment.
Fig. 2 is a plan view in a natural state of a portion of the disposable diaper according to the present embodiment.
FIG. 3 is a cross-sectional view of the disposable diaper taken along the line F1-F1 shown in FIG. 1 .
Fig. 4 is a cross-sectional view of the disposable diaper taken along the line F2-F2 shown in Fig. 1 .
It is a figure which shows the state which attached the disposable diaper which concerns on this embodiment to a wearer.
It is a figure which shows typically the deformed state of a rear side waist elastic sheet.

Next, embodiment of the disposable diaper 10 which concerns on this invention is demonstrated, referring drawings. In addition, in description of the following drawings, the same or similar code|symbol was attached|subjected to the same or similar part. However, it should be noted that the drawings are schematic, and the ratio of each dimension and the like are different from the actual ones.

Therefore, specific dimensions and the like should be determined in consideration of the following description. In addition, even between the drawings, a portion having a different dimension relationship or ratio may be included.

(1) Overall schematic configuration of disposable diapers

1 : is an expanded top view of the extended state of the disposable diaper 10 which concerns on this embodiment. Fig. 2 is a plan view in a natural state of a part (rear end side) of the disposable diaper according to the present embodiment. Fig. 3 is a cross-sectional view of the disposable diaper taken along the line F1-F1 shown in Fig. 1 . Fig. 4 is a cross-sectional view of the disposable diaper taken along the line F2-F2 shown in Fig. 1 .

The stretched state shown in Fig. 1 is the elastic member of the leg stretchable portion 75 and the leg side gathers 80 until the topsheet 50, the side flap 70, and the like constituting the disposable diaper are not wrinkled. (81) is in the expanded state. On the other hand, in the natural state, when the disposable diaper 10 is sealed in a package or the like, it is taken out from the package and left to stand for 12 hours in an atmosphere of 20°C±2°C and 60%±5% RH in relative humidity. am. In a disposable diaper in a natural state, pleats are formed on the topsheet 50, side flaps 70, and the like constituting the disposable diaper.

The disposable diaper 10 is a tape type disposable diaper. The tape type is a diaper in which the outer end of the product width direction of the front waist region and the outer end of the product width direction of the rear waist region are not joined before use, but are joined by a fixing member such as a fastening tape during use. .

The disposable diaper 10 has a front waist region 20 , a crotch region 25 , and a back waist region 30 . The front waist region 20 is a portion in contact with the wearer's front waist portion (belly portion). In addition, the rear waist region 30 is a portion in contact with the wearer's rear waist portion (back portion). The crotch region 25 is located between the front waist region 20 and the back waist region 30 .

In this embodiment, the direction from the front waist region 20 to the rear waist region 30 is called the product longitudinal direction L, and the direction orthogonal to the product longitudinal direction L is the product width direction ( W) is called.

The disposable diaper (10) has an absorbent body (40) that spans the crotch region (25) and extends from the crotch region (25) toward at least one of the front waist region (20) and the rear waist region (30). to provide The absorbent body 40 is composed of an absorbent core 40a and a core wrap 40b.

The absorbent core 40a is the same as that of 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 surrounded by a sheet-shaped core wrap 40b.

The core wrap 40b is a sheet covering the absorbent core 40a. At least a part of the skin surface side of the core wrap 40b is composed of various types of nonwoven fabrics or tissue sheets having liquid permeability. For example, an air-through fiber nonwoven fabric having a mass of about 10 to 30 g/m2, a spunbond nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric, or a tissue sheet having a mass of about 10-30 g/m2 can be used. .

The absorbent body 40 in the back waist region is provided with a low-rigidity portion 110 serving as a low-rigidity region in which the unit weight is lower than that of other portions of the absorbent body or the absorbent core 40a does not exist. The low rigidity portion 110 has a shape in which the length in the product width direction gradually decreases from the center of the product width direction at the end of the absorbent body 40 on the back waist region side toward the front waist region side. More specifically, it is wedge-shaped in the planar view of a disposable diaper. Further, the boundary between the absorbent core 40a and the low-rigidity portion 110 is formed in a circular arc convex in the center direction of the product width direction (W). The absorbent body 40 outside the product width direction from the low-rigidity part 110 has a trapezoidal shape convex toward the end of the rear waist region side.

A liquid-permeable topsheet 50 is provided on the surface side (skin contact surface side) of the absorbent body 40 . In addition, a liquid-impermeable back sheet 60a is provided on the back side (skin non-contact side side) of the absorbent body 40 . An exterior sheet 60 is provided on the back side (skin non-contact side) of the back sheet 60a.

The back sheet 60a is disposed inside the product longitudinal direction from the front end 10F of the disposable diaper and inside the product longitudinal direction from the rear end 10R of the disposable diaper. The back sheet 60a is arrange|positioned inside the product width direction rather than the product width direction edge part of a disposable diaper. The outer sheet is disposed on the surface of the disposable diaper on the non-skin-contact side. The exterior sheet is made of, for example, a nonwoven fabric.

Side flaps 70 are provided on the side edges of the absorber 40 in the product width direction W, respectively. The side flaps 70 span the front waist region 20 , the crotch region 25 , and the rear waist region 30 , and are disposed outside the absorbent body 40 in the product width direction. The side flap 70 is comprised from the nonwoven fabric which laminated|stacked 1 sheet or 2 or more sheets.

A pair of leg openings 35 are formed in the side flaps 70 of the disposable diaper 10 . The leg opening 35 is provided at the side end of the disposable diaper in the product width direction, and is a portion arranged along the circumference of the wearer's leg in a state in which the disposable diaper is worn by the wearer. The leg openings 35 are recessed in the center direction in the product width direction of the absorbent body.

In addition, the pair of side flaps 70 is provided with a fastening tape 90, respectively. The fastening tape 90 is arrange|positioned at the outer edge part of the product width direction of a back waist area, and is fixed to the front waist area. The fastening tape 90 extends outward from the side flaps 70 in the product width direction. In the back waist region 30, it extends along the product width direction W and is fixed to the skin non-contact surface of the front waist region 20, thereby holding the disposable diaper 10 on the wearer's body.

The target part 95 is arrange|positioned on the skin non-contact surface in the front waist area, and it is comprised so that a pair of fastening tapes 90 may be fixed, respectively.

In the present embodiment, the waist holding portion is constituted by the front waist region 20 , the rear waist region 30 , and the fastening tape 90 . The waist holding portion of the back waist 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 waist holding part of the front waist area 20 is a range extending in the product width direction from the area|region in which the target part 95 was provided.

The side flap 70 is provided with a pair of leg expansion and contraction parts 75 which are arranged inside the product width direction than the leg opening 35 and outside the absorber 40 in the product width direction, and which can be stretched and contracted in the product longitudinal direction L. do.

The leg stretchable portion 75 may be configured so that the leg opening 35 can be stretched and contracted in the product longitudinal direction, and may be disposed along the leg opening 35 , a part of which is inclined with respect to the leg opening 35 . You may arrange|position in a state.

In addition, a pair of auxiliary stretchable parts 77 that are arranged over the crotch region 25 and the back waist region 30 and expand and contract in the product longitudinal direction are arranged outside the leg stretchable portion 75 in the product width direction. has been When the area in which the auxiliary stretchable portion 77 of the side flap 70 is provided is contracted, the side flap 70 follows the bulging buttocks of the wearer, and the area can cover the buttocks.

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

The leg stretchable portion 75 is constituted by three elastic members per one side that expands and contracts in the longitudinal direction of the product. The auxiliary stretchable portion 77 is constituted by one elastic member per one side that expands and contracts in the longitudinal direction of the product. The elastic member according to the present embodiment is made of polyurethane elastic fibers or natural rubber.

The rear end 75R of the leg stretchable portion 75 is disposed on the front side of the fastening tape 90 and inside the product in the width direction of the fastening tape. Accordingly, by the leg stretchable portion 75, the region on the front side and the width direction inner side of the fastening tape 90 is contracted.

The front end 77F of the auxiliary stretchable and contractible portion 77 is disposed behind the front end 75F of the leg stretchable and contractible portion 75 . Accordingly, the region behind the front end portion 75F of the leg stretchable portion 75 is contracted by the auxiliary stretching portion 77 . The rear end 77R of the auxiliary stretching and contracting portion 77 is disposed behind the rear end of the leg stretching and contracting portion. Therefore, by the auxiliary expansion and contraction part 77, the area|region behind the leg expansion-contraction part 75 is contracted.

The leg stretchable portion 75 can lift the crotch region of the disposable diaper toward the crotch portion of the wearer. In addition, the force raised by the leg stretchable portion can be transmitted to the fastening tape 90 by the auxiliary stretchable portion 77 . Therefore, in a state in which the fastening tape 90 is fixed, not only the area held around the wearer's waist by the fastening tape 90 and the area where the leg stretchable portion 75 is arranged, but also the fastening tape 90 and It becomes easy to make the area|region between the leg stretchable parts 75 closely_contact|adhere to a wearer.

In addition, the area outside the product width direction can be contracted by the auxiliary stretching and contracting portions, and the hips can be appropriately covered by the side flaps in the rear waist region. Accordingly, in particular, it is possible to suppress the recoil when the rear leg opening is worn. In addition, it is possible to draw the leg opening to the body side by the contraction of the leg stretchable portion, it is possible to suppress the distortion of the leg opening.

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

It is preferable that the elongation rate of the leg stretchable part 75 is 1.7-2.4 times. In the present embodiment, the elongation rate of the leg stretchable portion 75 is set to 1.9 to 2.2 times. In addition, the elongation rate means the degree of elongation of the leg expansion and contraction part, and it is prescribed|regulated as follows.

Elongation of leg stretch = (length of leg stretch in stretched state) ÷ (length of leg stretch part in natural state)

Moreover, it is preferable that the elongation rate of the auxiliary|assistant expansion-contraction part 77 is 1.6 to 2.4 times. In addition, the elongation rate of the auxiliary|assistant expansion-contraction part 77 means the extension degree of the auxiliary|assistant expansion-contraction part, and it is prescribed|regulated as follows.

Elongation rate of auxiliary stretchable part = (length of auxiliary stretchable part in stretched state) ÷ (length of auxiliary stretchable part in natural state)

In addition, in this specification, such elongation shall be measured as follows, for example.

First, when the disposable diaper 10 is enclosed in a package etc., the disposable diaper 10 is taken out from the package. Next, an arrangement region to be measured, such as a leg stretchable portion, is cut out. At this time, the exterior sheet to which the measurement object, such as a leg expansion-contraction part, is joined is also included and cut off. The elongation rate of the sample after cutting is measured, and the elongation rate of a measurement object is measured.

Each sample is left to stand for 60 minutes in an atmosphere of 20°C±2°C and 60%±5% RH relative humidity, and the length of the measurement object is measured along the expansion/contraction direction. Let this length be "the length of the measurement object (leg stretch-contraction part, etc.) in a natural state".

Second, the length in the stretch direction of the desired region in this state (that is, the natural state), and the desired region when stretched from the natural state to a state where wrinkles caused by the elastic member cannot be visually confirmed on the non-stretchable sheet Measure the length in the stretch direction. Let this length be "the length of the measurement object (leg stretch-contraction part, etc.) in an extended state".

The elongation rate is measured by calculating by the above-mentioned formula using these measurement results.

In addition, the measurement of "length" in this specification shall be performed by the following measuring 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 to stand for 12 hours in an atmosphere of 20°C±2°C and a relative humidity of 60%±5% RH in that state is used.

Next, using a spring measurer manufactured by Shinwa Measuring Co., Ltd. (tape: glass fiber-containing vinyl chloride coating), the measurement target site is traced, and the length of this state of the measurement target site is measured. In addition, the length of the stretched state measures the length of the measurement target site|part when the disposable diaper 10 is stretched from a natural state to the state which cannot confirm the wrinkle by an elastic member with the naked eye.

Here, the above-mentioned measurement was performed in each state with respect to 10 samples, and the average value was made into length.

In addition, 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 portions of the side flaps 70 in the product width direction, and are erectable expansion and contraction gathers arranged inside the leg expansion and contraction portions 75 in the product width direction. The leg side gathers 80 are arranged inside the product width direction from the leg expansion and contraction parts 75 . The leg side gathers 80 can employ a conventionally well-known structure, and specifically, may be comprised from the side flap 70 and a different sheet material.

The disposable diaper 10 spans the center of the product width direction of a disposable diaper, and has a waist elastic sheet which has elasticity in the product width direction. A waist elastic sheet has the rear side waist elastic sheet 85 arrange|positioned at the rear side edge part of a disposable diaper, and the front side waist elastic sheet 86 arrange|positioned at the front side edge part of a disposable diaper. Moreover, in FIG. 1, the imaginary line L1 extended in the product longitudinal direction through the product width direction center of a disposable diaper is shown.

The rear end 10R of the disposable diaper has a curved shape in which, in the natural state of the disposable diaper, the center of the product width direction of the rear end portion 10R is recessed in the product longitudinal direction rather than the product width direction outside of the rear end portion 10R. have The rear end of the rear waist elastic sheet 85 located at the rear end of the disposable diaper also has, in a natural state, a curved shape in which the product width direction center is dented inward in the product longitudinal direction rather than outward in the product width direction.

Moreover, in the stretched state (state shown in FIG. 1) in which the disposable diaper was stretched, as for the front edge part 85F of the rear side waist elastic sheet 85, the product width direction center of the front edge part 85F is the front edge part 85F. It has a curved shape dented outward in the longitudinal direction of the product rather than outward in the width direction of the product. Moreover, the curved shape of the rear side waist elastic sheet is not formed in the whole front side edge part 85F, but is formed in the width direction center which is a part of a front side edge part.

The rear side waist elastic sheet 85 is arrange|positioned between a pair of fastening tapes in the product width direction. A part of the front side edge part 85F of the rear side waist elastic sheet 85 overlaps with the absorber. The rear side edge part 85R of the rear side waist elastic sheet 85 coincides with the rear side edge part of a disposable diaper. The length of the product width direction of the rear side waist elastic sheet 85 is longer than the length of the product width direction of the absorber 40, and it is longer than the length of the width direction of the back sheet 60a. The rear side waist elastic sheet extends outward from the absorber 40 in the product width direction, and extends outward from the back sheet 60a in the product width direction.

The front end 10F of the disposable diaper has a curved shape in which, in the natural state of the disposable diaper, the center of the product width direction of the front end portion 10F is recessed in the product longitudinal direction rather than the product width direction outside of the front end 10F. have The front end 86F of the front waist elastic sheet 86 located at the front end of the disposable diaper is also in the natural state of the disposable diaper. The product width direction center of the front end 86F is the product width of the front end 86F. It has a curved shape dented inward in the longitudinal direction of the product rather than outward in the direction.

Moreover, in the stretched state (state shown in FIG. 1) in which the disposable diaper was stretched, in the rear end 86R of the front waist elastic sheet 86, the center of the product width direction of the rear end 86R is the rear end 86R. It has a curved shape dented outward in the longitudinal direction of the product rather than outward in the width direction of the product. Moreover, the curved shape of the front side waist elastic sheet is not formed in the whole rear side edge part 86R, but is formed in the width direction center which is a part of rear side edge part 86R.

The rear side edge part 86R of the front side waist elastic sheet 86 adjoins the absorber 40 in the product longitudinal direction, and adjoins the target part 95. As shown in FIG. The rear side edge part 86R of the front side waist elastic sheet 86 is located outside the absorber 40 in the product longitudinal direction, and is located outside the target part 95. As shown in FIG.

The front side edge part 86F of the front side waist elastic sheet 86 coincides with the front side edge part of a disposable diaper. The length of the product width direction of the front side waist elastic sheet 86 is longer than the length of the product width direction of the absorber 40, and it is longer than the length of the width direction of the back sheet 60a. 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, as the waist elastic sheet, it is preferable to use a sheet in which, when the sheet is stretched in one direction, the width of the sheet in the second direction orthogonal to the stretching direction becomes narrow (so-called width decrease).

The elastic waist sheet is a sheet made of a mixture of elastic fibers having elastic extensibility and inelastic fibers having inelastic extensibility, particularly 20 to 80 g/m 2 by mass, and more preferably 40 to 75 g/m 2 by mass. , more preferably a spunbond 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 is a polyolefin having a fineness of 2 to 6 dtex. It is possible to use a spunbond nonwoven fabric sheet, which is at least one filament among filaments of fibers, polyester fibers, and polyamide fibers, and in which the weight mixing ratio of elastic fibers and non-elastic fibers is in the range of 40:60 to 60:40. Elasticity is expressed by breaking a part of the inelastic fiber layer with a gear in a non-woven fabric of a mixed fiber of inelastic fibers and elastic fibers. As another waist elastic sheet, if it is a width-reducing sheet|seat, it can be set comparatively easily as the width-reduced shape of this structure. Moreover, a waist elastic sheet is not limited to a nonwoven fabric sheet, You may be comprised from the film sheet. It is also possible to use a sheet in which the elastic sheet is preformed in advance so that the width in the longitudinal direction of the product changes (cut so as to become convex inward).

It is preferable that the elongation rate of the rear side waist elastic sheet 85 is 1.4 times - 1.8 times. In this embodiment, the elongation rate of the rear side waist elastic sheet 85 is set to 1.5 times - 1.6 times. In addition, elongation rate means the extension degree of a rear side waist elastic sheet, and is prescribed|regulated as follows.

Elongation rate of rear waist elastic sheet = (length of rear waist elastic sheet in stretched state) ÷ (length of rear waist elastic sheet in natural state)

It is preferable that the elongation rate of the front side waist elastic sheet 86 is 1.3 times - 1.7 times. In this embodiment, the elongation rate of the front side waist elastic sheet 86 is set to 1.4 times - 1.6 times. In addition, elongation rate means the extension degree of a front side waist elastic sheet, and is prescribed|regulated as follows.

Elongation rate of the front waist elastic sheet = (length of the front waist elastic sheet in the stretched state) ÷ (the length of the front waist elastic sheet in the natural state)

In this embodiment, the waist elastic sheet is arrange|positioned between the exterior sheet|seat 60 and the back sheet|seat 60a. However, in the configuration in which the core wrap 40b extends outward in the product longitudinal direction than the absorbent core 40a, the elastic waist sheet is formed between the core wrap 40b and the back sheet 60a or the exterior sheet 60. may be placed in The position of the waist elastic sheet is not particularly limited. In addition, in the area|region where an absorber is not arrange|positioned, you may arrange|position between the side flap 70 and the back sheet|seat 60a or the exterior sheet|seat 60. As shown in FIG.

The rear waist elastic sheet 85 is arrange|positioned overlapping with a part of the low rigidity part 110 of an absorber in the plan view of a disposable diaper. Moreover, in this embodiment, although the rear side waist elastic sheet 85 overlaps with a part of the low-rigidity part 110, and is arrange|positioned, all of the rear side waist elastic sheets 85 and the low-rigidity part 110 may be overlapped and arrange|positioned. .

By forming such a low-rigidity part 110, the low-rigidity part 110 is narrowed, and the low-rigidity part (110) becomes narrow even if the rear-side waist elastic sheet 85 is contracted without inhibiting the expansion and contraction of the rear waist elastic sheet 85. 110), since the gap between the absorbers on both sides of the product width direction is narrower, the absorber 40 is less likely to rise in an unintended shape. In addition, it is preferable that the low rigidity part 110 is narrower than the width|variety of the rear side waist elastic sheet 85 in consideration of the leakage prevention of excrement.

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

The fastening tape 90 is attached to the area of the side flap 70 corresponding to the back waist area 30 . The fastening tape 90 is provided with a base sheet 91 connected to the side flaps 70 and engaging hooks (not shown) as a plurality of engaging members, and a hook sheet 92 fixed to the base sheet 91 . ) is provided. The hook sheet 92 is a region in which the engaging member is provided, and the waist-holding portion in the back waist region described above is a region extending from the hook sheet 92 in the product width direction.

The hook sheet 92 is fixed to the base sheet 91 and specifically joined. It is preferable that the bonding between the hook sheet 92 and the base sheet 91 is such 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 dotted shape, a linear shape, or a spiral shape. Moreover, the hook sheet 92 and the base material sheet 91 may be joined by heat sealing etc.

The base material sheet 91 is comprised from the nonwoven fabric which laminated|stacked multiple sheets of 1 sheet or 2 or more sheets. As the base sheet 91, a nonwoven fabric manufactured by a manufacturing method such as spunbond (SB) or spunbond-meltblown-spunbond (SMS) can be used. The unit weight of the nonwoven fabric constituting the base sheet 91 (in the case of a plurality of sheets, the total unit weight) is 30 to 120 g/m 2 , preferably 40 to 90 g/m 2 .

The fastening tape includes a base portion 93 superimposed on the exterior sheet, and an extension portion 94 extending outward in the product width direction from the exterior sheet. The base part 93 is a part overlapped with the exterior sheet|seat among the base material sheet 91 in the state in which the fastening tape was expanded. The extension part 94 is a part of the base material sheet 91 which does not overlap with the exterior sheet|seat. In the extended state of the disposable diaper shown in FIG. 1, in the product longitudinal direction, the product longitudinal center of an extension part coincides with the product longitudinal center of a base part. However, in the natural state of the disposable diaper, the position of the fastening tape changes according to the curvature of the rear elastic sheet 85, and the longitudinal center of the extension part is located outside the product longitudinal direction of the base part. do.

In addition, in this invention, the state in which members overlap is a concept including not only the state in which members directly overlap, but the state in which members overlap indirectly (a state which overlaps with other members sandwiched between them).

The target part 95 is provided in the surface of the skin non-contact side of the exterior sheet 60 of a front waist region. The target part 95 is comprised so that the coupling hook of a fastening tape may be caught, and it functions as a loop of the hook and loop latching system. As the target portion, for example, an air-through nonwoven fabric can be used.

The target part 95 may use, for example, a fibrous nonwoven fabric made of polyolefin-based thermoplastic synthetic resin fibers or a polyolefin-based thermoplastic synthetic resin film. In addition, the loop attached to the target part can be formed from the thermoplastic synthetic resin of polyolefin type.

Moreover, as the target part 95, you may use the nonwoven fabric which is a bulky nonwoven fabric, and the nonwoven fabric which prevented the generation of fluff on the nonwoven fabric surface by embossing a part.

In addition, the outer sheet 60 of the disposable diaper is formed of a nonwoven fabric, and a pattern indicating the attachment position of the fastening tape 90 is printed on the back sheet 60a or the surface of the outer sheet 60 on the non-skin side surface, Alternatively, the target portion can also be formed by arranging the patterned sheet on the non-skin-contact side of the back sheet 60a or the exterior sheet 60 .

Next, the attachment state of the disposable diaper comprised in this way is demonstrated. When putting on the disposable diaper, the attaching assistant pulls the fastening tape of the back waist area toward the front waist area side. The attachment assistant fixes the fastening tape to the target part in the state which pulled the fastening tape to the front waist region.

The state which attached the disposable diaper of this embodiment to a wearer in FIG. 5 is shown. Fig. 5 is a state in which the disposable diaper is attached so that the fixing position of the fastening tape is fixed on the crotch side and inside the width direction, and the front waist region is pulled up and pulled out in the width direction. By attaching the disposable diaper to the wearer in this way, the front waist region of the disposable diaper can be continuously raised, and the bulging abdomen of infants and young children is easily covered.

Further, by pulling the fastening tape to the front waist region at the time of wearing, the rear end of the disposable diaper is stretched in the width direction. It is a figure which shows the deformation|transformation aspect of the rear side waist elastic sheet when the back waist area of a disposable diaper is stretched in the width direction via a fastening tape. (a) has shown the state before deformation, (b) is the state pulled outward in the product width direction from (a), (c) is the state which pulled the fastening tape further.

In the state before deformation shown in Fig. 6(a) , the rear end of the disposable diaper has a curved shape in which the center of the rear end in the product width direction is dented inward in the product longitudinal direction rather than the product width direction outside of the rear end. In the state before deformation, the front end of the rear waist elastic sheet has a curved shape in which the product width direction center of the front end portion is dented outward in the product longitudinal direction rather than the product width direction outer side of the front end portion.

When the fastening tape is slightly stretched outward in the width direction from the state before deformation, it will be in the state shown in FIG.6(b). By pulling the fastening tape to the front waist region, the rear end of the disposable diaper is stretched in the width direction. Even in this state, the rear end of the disposable diaper has a curved shape in which the product width direction center of the rear end portion is dented inward in the product longitudinal direction rather than the product width direction outer side of the rear end portion. Moreover, the front edge part of a rear side waist elastic sheet has a curved shape in which the product width direction center of a front edge part was dented outward in the product longitudinal direction rather than the product width direction outer side of a front edge part.

When the fastening tape is slightly stretched outward in the width direction from the state shown in FIG.6(b), it will be in the state shown in FIG.6(c). The rear edge part of a disposable diaper becomes substantially parallel to the product width direction. The front end of the rear waist elastic sheet has a curved shape in which the product width direction center of the front end portion is dented outward in the product longitudinal direction rather than the product width direction outer side of the front end portion.

In addition, since the rear end of the disposable diaper is curved in the state before deformation, the length in the width direction of the rear end of the disposable diaper is longer than the length in the width direction at the position inside the product longitudinal direction from the rear end. Therefore, the rear end of the disposable diaper tends to extend in the width direction. However, in a state pulled outward in the width direction (state attached to the wearer) as in the state of Fig. 6(c), the amount of extension by the waist elastic sheet at the rear end of the disposable diaper is higher than the rear end in the product longitudinal direction. It becomes larger than the extension amount by the waist elastic sheet in the position (for example, the front end of a rear waist elastic sheet). Therefore, the pressing force of the rear side waist elastic sheet becomes larger toward the outer side in the product longitudinal direction. In the attached state, the rear end of the rear waist elastic sheet can pull up the front waist region and stretch it outward in the width direction.

(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, an existing method can be used about the method which is not demonstrated in this embodiment. In addition, the manufacturing method demonstrated below is an example, and it can also manufacture by another manufacturing method. The manufacturing method of a disposable diaper contains a component component formation process, a component component mounting process, a leg circumference formation process, and a cutting process at least.

The manufacturing method of a disposable diaper produces individual disposable diapers by manufacturing the continuum in which the disposable diaper is continuous in the product longitudinal direction, and cutting the continuum into the size of one product along the product width direction W. do.

In a component forming process, the component which comprises a disposable diaper is formed. Specifically, for example, the absorber 40 is formed by laminating an absorbent material.

In the component placing step, on the continuous web constituting the back sheet, another web such as a waist elastic sheet and a continuous web constituting the top sheet, an absorber, a leg elastic portion 75, and an auxiliary elastic portion 77 Components constituting the disposable diaper 10 such as such are mounted.

At this time, a waist elastic sheet is the state in which the front side waist elastic sheet 86 of arbitrary disposable diapers, and the rear side waist elastic sheet 85 of the disposable diaper adjacent to this arbitrary disposable diapers were integrated. Both ends of the elastic waist sheet (parts forming the product width direction outer ends in a state of being molded into a disposable diaper) are held by a suction means or the like, and the waist elastic sheet is stretched in the product width direction of the disposable diaper, on a continuous web paste it Since the waist elastic sheet is stretched in the state where the both ends of the waist elastic sheet were held, the both ends of the waist elastic sheet are hardly stretched. The elongation rate in the product width direction of the both ends of a waist elastic sheet becomes lower than the elongation rate of the product width direction of the area|region between the both ends.

In the area|region where the waist elastic sheet of a disposable diaper is specifically arrange|positioned, three divisions from which an elongation rate differs are formed. Let the product width direction center of the area|region where the waist elastic sheet is arrange|positioned be a central area, let the product width direction edge part (corresponding to both ends of the waist elastic sheet) of the area|region where the waist elastic sheet is arrange|positioned be a side area|region, a central area and a side area When the region in between is defined as the intermediate region, the relationship between the elongation percentage is: elongation in the product width direction in the central region>elongation in the product width direction in the middle region>elongation in the product width direction in the side region.

The elongation in the width direction of the product in the central region can be 1.4 to 1.8 times. The elongation rate in the product width direction in the side region is set lower than the elongation rate in the product width direction in the center region, and may be 1.0 to 1.1 times. The elongation rate in the product width direction in the middle region is set lower than the elongation rate in the product width direction in the central region and higher than the elongation rate in the side region, and may be 1.2 times to 1.3 times. Moreover, the area|region in which the elongation rate of the product width direction of a side area|region is 1.0 times and does not extend substantially may be sufficient as a side area|region.

Further, the stretchable sheet stretched in the product width direction decreases in width in the product length direction. In particular, the width of the center of the elastic sheet in the product width direction is reduced. Accordingly, in the stretched elastic 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 portion in the product width direction. As shown in Fig. 1, in the elastic sheet affixed in such a reduced width state, the rear end of the front waist elastic sheet corresponding to the end in the product longitudinal direction of the elastic sheet and the front end of the rear waist elastic sheet correspond to the end of the elastic sheet in the width direction outside. It becomes a curved shape in which the center of a width direction is dented more.

In the leg circumference forming step, the top sheet 50 , the exterior sheet 60 , and the back sheet 60a are cut. Accordingly, the front end 77F of the auxiliary stretchable portion 77 is cut, and the leg opening 35 disposed around the wearer's leg is formed.

In the cutting step, the continuum on which the topsheet 50, the backsheet 60a, the absorber 40, etc. are arranged is cut to the size of one product along the product width direction W. Accordingly, the disposable diaper 10 is manufactured.

When the continuum is cut for each product, the stretched state of the waist elastic sheet and the leg elastic portion provided in the disposable diaper is released and becomes a natural state. When the stretched state is released, the waist elastic sheet in a state in which the width is reduced at the time of extension is deformed so as to return to the state before the decrease in width. Therefore, although the rear side edge part of a rear side waist elastic sheet and the front side edge part of a front side waist elastic sheet were linear in an extended state, it deform|transforms into a curved state in a natural state.

The front end of the front waist elastic sheet is contracted from the rear end of the front waist elastic sheet, so that the product width direction center of the front end portion of the disposable diaper is dented in the product longitudinal direction rather than the product width direction outer side of the front end portion of the disposable diaper. becomes a curved shape. Similarly, the rear end of the rear waist elastic sheet is contracted from the front end of the rear waist elastic sheet, so that the product width direction center of the rear end portion of the disposable diaper is inward in the product longitudinal direction rather than the product width direction outer side of the rear end of the disposable diaper. It becomes a concave curved shape.

In addition, when the continuum is cut for one product and in a natural state, the front end of the front waist elastic sheet is contracted more than the rear end of the front waist elastic sheet, and the rear end of the rear waist elastic sheet is the front end of the rear waist elastic sheet more constricted The front end of the front waist elastic sheet is farther from the absorbent core 40a than the rear end of the front waist elastic sheet, and since the rigidity of the absorbent core 40a does not affect it, it is further contracted. The rear end of the rear waist elastic sheet is farther from the absorbent core 40a than the front end of the rear waist elastic sheet, and since the rigidity of the absorbent core 40a does not affect it, it is further contracted.

(3) Action and effect

A rear waist elastic sheet is arranged at the rear end of the disposable diaper, so that it can be easily stretched and contracted in the width direction, and since the rear end of the disposable diaper is curved in a natural state, the rear end of the disposable diaper can be more easily contracted . In a state in which the disposable diaper is attached to the wearer, it can be stretched outward in the width direction while pulling up the front waist region by the waist elastic sheet located at the rear end. For example, even when the position of the disposable diaper is shifted, it can be stretched outward in the width direction while pulling up the front waist region, so that it is easy to maintain the state of covering the bulge of the abdomen.

The rear waist elastic sheet overlaps with the waistline holding part and is arrange|positioned. More preferably, the rear waist elastic sheet is disposed beyond the center of the product longitudinal direction of the waist holding part, and still more preferably, it is disposed beyond the crotch side end of the waist holding part in the product longitudinal direction. Since the waist retaining portion for holding the disposable diaper on the wearer's body can be contracted in the width direction by the waist constricting portion, the waist retaining portion continues to fit around the wearer's abdomen even if the mounting position of the disposable diaper is shifted. can do it

The rear side edge part of a rear side waist elastic sheet does not overlap with an absorber, but the front side edge part of a rear side waist elastic sheet overlaps with an absorber. The absorbent body has relatively high rigidity in the constituent members constituting the disposable diaper. Therefore, the part which overlaps with the absorber of a rear side waist elastic sheet is more difficult to shrink|contract than the part which does not overlap with an absorber.

Therefore, the rear edge part of a rear waist elastic sheet becomes relatively easy to shrink|contract than the front edge part of a rear waist elastic sheet, and can exhibit the effect which raises the front waist region side further at the time of wearing.

The rear end of the absorber is provided with a low-rigidity portion. By providing this low-rigidity part, it becomes easy to expand|deploy the rear side edge part of an absorber in the width direction, and it becomes easy to expand|extend the rear side edge part of a waist elastic sheet further in the product width direction when attaching|wearing. Therefore, in the state in which the disposable diaper was attached to the wearer, the effect which raises the front waist region side by a rear side waist elastic sheet can be exhibited further.

The front end of the disposable diaper may be disposed over the bulge of the wearer's abdomen. At this time, if the front body end is parallel to the width direction, it is conceivable that the bulging and curved shape of the abdomen is not followed. However, since the front end is the curved shape, the front end can be arranged along the bulge of the abdomen.

In the natural state of the disposable diaper, the product longitudinal center of the extension portion is located outside the product longitudinal center of the base portion in the product longitudinal direction. That is, in the natural state of a disposable diaper, the extending direction of the extension part of a fastening tape is not parallel to the product width direction, but inclines toward the product longitudinal direction outer side from the width direction inner side to the width direction outer side.

Since the extended part of the fastening tape is outside the base part in the longitudinal direction, it is easy to arrange the extended part on the crotch side rather than the base part with the fastening tape fixed to the front side. Therefore, the force pulling up by the fastening tape becomes easy to act on the rear side and the upper side.

The back film is disposed inside the product longitudinal direction rather than the rear end of the disposable diaper. The portion where the liquid-impermeable backsheet is disposed has higher rigidity than the portion where the backsheet is not disposed, and is difficult to extend.

The rear end of the disposable diaper is more likely to expand in the width direction, so that the rear end of the waist elastic sheet can be more easily stretched in the width direction when worn, and the effect of further raising the front waist region during wearing can be exhibited. have.

(4) Other embodiments

As described above, although the content of the present invention has been disclosed through the embodiments of the present invention, the statements and drawings that form a part of this disclosure should not be construed as limiting the present invention. Various alternative embodiment, an Example, and an operation technique become clear to those skilled in the art from this indication.

A modification WHEREIN: The rear side waist elastic sheet may not overlap with a waistline holding part and may not be arrange|positioned.

A modification WHEREIN: The rear side waist elastic sheet may be arrange|positioned so that it may not overlap with an absorber, and the front side waist elastic sheet may be arrange|positioned so that it may overlap with an absorber.

In the modified example, the low-rigidity region may not be formed in the absorber 40 .

A modification WHEREIN: The disposable diaper does not need to have a front side waist elastic sheet.

In a modification, in the natural state of the disposable diaper, the product longitudinal center of the extension portion may coincide with the product longitudinal center of the base portion in the product longitudinal direction, and is located inside the product longitudinal direction than the product longitudinal center of the base portion also good

A modification WHEREIN: The back film may extend to the rear edge part of a disposable diaper, may extend to the front edge part of a disposable diaper, and may extend to the product width direction edge part of a disposable diaper.

As described above, it goes without saying that the present invention includes various embodiments not described herein. Accordingly, the technical scope of the present invention is determined only by the invention specific matters related to the claims appropriate from the above description.

In addition, all the content of Japanese Patent Application No. 2013-156030 (July 26, 2013 application) is taken in in this specification by reference.

It is possible to provide a disposable diaper that can adequately cover the bulge of the wearer's abdomen.

10: disposable diaper 20: front torso area
25: crotch area 30: back waist area
35: leg opening 40: absorber
40a: absorbent core 40b: core wrap
50: top sheet 60: exterior sheet
60a: back seat 70: side flaps
75: leg stretchable portion 75F: front end
75R: rear end 77: auxiliary stretchable part
77F: front end 77R: rear end
80: leg side 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 material sheet
92: hook seat 93: base part
94: extension 95: target portion
110: low rigidity part L: product longitudinal direction
W : Product width direction

Claims (8)

a front waist region, a rear waist region, and a crotch region located between the front waist region and the rear waist region;
a product longitudinal direction from the front waist region to the rear waist region;
a product width direction orthogonal to the product length direction;
an absorbent body spanning the crotch region and extending to one or both of the front waist region and the rear waist region;
A pair of fastening tapes disposed at the outer end of the product in the width direction of the rear waist region and fixed to the front waist region;
In the disposable diaper provided with a waist elastic sheet spanning the center of the product width direction of the disposable diaper and having elasticity in the product width direction,
The said waist elastic sheet has a rear side waist elastic sheet arrange|positioned at the rear side edge part of the said disposable diaper,
The rear end of the disposable diaper, in the natural state of the disposable diaper, has a curved shape in which the product width direction center is dented inward in the product longitudinal direction rather than outside in the product width direction,
The rear waist elastic sheet, in a state extended in the product width direction, is decreasing in width in the product longitudinal direction,
In the state in which the rear waist elastic sheet is stretched in the product width direction, the length in the product longitudinal direction of the product width direction center of the rear waist elastic sheet is the length of the product width direction end of the rear waist elastic sheet shorter than the length in the longitudinal direction of the product,
In the state in which the rear waist elastic sheet is stretched in the product width direction, the product width direction center of the front end of the rear waist elastic sheet is greater than the product width direction end of the front end of the rear waist elastic sheet Disposable diapers that are recessed outward along the length of the product. According to claim 1, wherein in the front waist region and the rear waist region, extending along the product width direction, comprising a waist holding portion for holding the disposable diaper on the wearer's body,
The said rear waist elastic sheet is a disposable diaper arrange|positioned by overlapping with the said waist holding part. The product according to claim 1 or 2, wherein the absorber is disposed inside the product longitudinal direction rather than the rear end of the rear waist region,
The front end of the said rear side waist elastic sheet is a disposable diaper which overlaps with the said absorber and is arrange|positioned. The absorbent body according to claim 1 or 2, wherein the absorbent body is provided with a low-rigidity region having a unit weight lower than that of other portions of the absorbent body or having no absorbent core,
The low rigidity region has a shape in which the length in the product width direction becomes shorter from the center of the product width direction at the rear end of the absorbent body toward the front waist region. The said waist elastic sheet has a front side waist elastic sheet arrange|positioned at the front edge part of the said disposable diaper,
The front end of the disposable diaper has a curved shape in which, in a natural state of the disposable diaper, a product width direction center is dented inward in the product longitudinal direction rather than outward in the product width direction. 3. The method according to claim 1 or 2, wherein at least in the rear waist region, an exterior sheet disposed on a skin non-contacting surface side of the absorbent body is provided;
The fastening tape includes a base portion overlapping the exterior sheet, and an extension portion extending outward in the width direction of the product from the exterior sheet,
In the natural state of the disposable diaper, the product longitudinal center of the extension portion is positioned outside the product longitudinal direction center of the base portion in the product longitudinal direction. The liquid-impermeable back film according to claim 1 or 2, wherein at least in the rear waist region, a liquid-impermeable back film disposed on the skin non-contacting surface side of the absorbent body is provided;
The back film is a disposable diaper disposed inside the product longitudinal direction than the rear end of the rear waist region. The waist elastic sheet according to claim 1 or 2, wherein a central region that is the center of the product width direction of the region where the waist elastic sheet is disposed, a side region that is an end portion of the product width direction end of the region where the waist elastic sheet is disposed, and the waist an intermediate region between the central region and the side region of the region in which the stretchable sheet is disposed;
The elongation of the product in the width direction of the central region is higher than the elongation of the product in the width direction of the middle region,
A disposable diaper whose elongation rate in the product width direction of the intermediate region is higher than an elongation rate of the side region in the product width direction.

Images