TWI661816B - Disposable diapers - Google Patents

Abstract

Disposable disposable diapers (10), comprising: a pair of hook-and-loop fasteners (90) disposed on the outer end of the product in the width direction of the back waist region and fixedly adhered to one of the front waist regions; The center of the product's width direction is a type of diaper, which has a stretchable waist stretch sheet in the product width direction. The waist elastic sheet includes a waist elastic sheet (85) disposed behind the rear end portion (10R) of the disposable diaper. The rear end of the disposable diaper (10R), in the natural state of the disposable diaper, is equipped with a product whose center in the width direction of the product is recessed toward the inside of the product's long side than the product in the width direction. Its curved shape.

Description

Disposable diapers

The present invention relates to disposable diapers.

In the past, it is known to have an absorber having a front waist region, a rear waist region, and a lower hip region, and extending across the lower hip region to the front waist region and the rear waist region, and fixedly adhered to the front waist region and the rear waist region A disposable diaper with a hook-and-loop fastener (for example, refer to Patent Document 1).

Generally, the hook-and-loop fastener extends from the widthwise outer end of the rear waist area of the disposable diaper to the widthwise outer side. When wearing the disposable diaper of Patent Document 1, with the lower part of the hip of the disposable diaper disposed under the wearer's hips, the hook-and-loop fastener is pulled out toward the front waist region. The hook-and-loop fastener is fixed to the front waistline.

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 the disposable diaper is close to the wearer's waist by the expansion and contraction of the elastic member.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2006-20665

In general, the baby's belly circumference is more prominent. In order to appropriately cover the protrusion of the belly of the infant, it is conceivable that the wearing assistant fixes the adhesive tape on the protrusion of the abdomen. In a state in which the hook and loop fastener is fixed and adhered to the protruding portion of the abdomen, the area extending from the hook and loop belt in the wide direction will closely fit the wearer's body, and the waist opening will be wide by the direction of the elastic member. The contraction in the direction fits around the abdomen of the wearer.

In a state in which the hook and loop fastener is fixed and adhered to the protruding portion of the abdomen, the size of the area extending from the hook and loop band in the wide direction is combined with the size of the abdomen circumference of the wearer. However, the position of the disposable diaper may shift due to the movement of the wearer. For example, if the fixed adhesive position of the hook and loop fastener of a disposable diaper is moved to the underside of the buttocks, the area extending from the hook and loop fastener in a wide direction will be staggered from the protrusion of the wearer's abdomen. Therefore, the size of the area extending from the hook and loop in the wide direction will become larger than the waist of the wearer, and the position of the disposable diaper will be more easily displaced after use.

Here, the present invention has been made in view of such circumstances, and an object thereof is to provide a disposable diaper which can appropriately cover the protruding part of the wearer's abdomen.

The disposable diapers (disposable diapers 10) related to the present disclosure include: a front waist area (front waist area 20), a back waist area (back waist area 30), and The lower hip region (lower hip region 25) between the waist region and the rear waist region, and the product long side direction (product long side direction L) extending from the front waist region to the rear waist region, and the product length The product width direction (product width direction W) orthogonal to the side direction, and the absorbent body (absorber 40) which spans the lower hip region and extends to at least one of the front waist region and the rear waist region, and is disposed on The outer end of the product in the width direction of the back waist area is fixedly adhered to one of the pair of hook-and-loop fasteners (hook-and-loop 90) of the front waist area, and the center of the product across the width direction of the disposable diaper and faces The disposable waist diaper with a stretchable waist elastic sheet in the wide direction of the product is characterized in that the waist elastic stretch sheet is provided with a rear waist elastic stretch sheet disposed at the rear end of the disposable diaper. (Rear waist waist stretch sheet 85), above In the natural state of the disposable diaper, the rear end portion of the disposable diaper is provided with a center in which the width direction of the product is recessed toward the inner side of the long side of the product than the outside in the width direction of the product. Bent shape.

10‧‧‧ disposable diapers

20‧‧‧ front waist area

25‧‧‧ Sub hip region

30‧‧‧Back waist area

35‧‧‧ thigh opening

40‧‧‧ Absorber

40a‧‧‧ Absorbent Chip

40b‧‧‧chip adhesive film

50‧‧‧ surface sheet

60‧‧‧ Exterior sheet

60a‧‧‧Back sheet

70‧‧‧ flank

75‧‧‧ Thigh telescopic section

75F‧‧‧Front end

75R‧‧‧Rear end

77‧‧‧Auxiliary telescopic section

77F‧‧‧Front end

77R‧‧‧Rear end

80‧‧‧ thigh side frill

81‧‧‧elastic member

85‧‧‧Rear waist stretch sheet

85F‧‧‧Front end

85R‧‧‧Rear end

86‧‧‧Front waist stretch sheet

86F‧‧‧Front end

86R‧‧‧Rear end

90‧‧‧ Velcro

91‧‧‧ substrate sheet

92‧‧‧ hook sheet

93‧‧‧ base

94‧‧‧ extension

95‧‧‧ Velcro

110‧‧‧Low rigidity

L‧‧‧ Product Long Side Direction

W‧‧‧ Product wide direction

Figure 1 shows the elongation of disposable diapers after use in this embodiment. Expanded plan view of the state.

Fig. 2 is a plan view showing a natural state of a part of the disposable diaper according to the embodiment;

Figure 3 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in Figure 1.

Figure 4 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in Figure 1.

Fig. 5 is a view showing a state in which the disposable diaper of the embodiment is worn by a wearer according to this embodiment.

FIG. 6 is a schematic view showing a deformed state of the back waist elastic sheet.

Next, an embodiment of the disposable diaper 10 according to the present invention will be described with reference to the drawings. It should be noted that in the following drawings, the same or similar parts are denoted by the same or similar symbols. However, the schematic surface should be left as a schematic diagram, and the ratio of each dimension is different from the actual one.

Therefore, specific dimensions and the like should be determined with reference to the following description. Also, the drawings may include portions having different dimensional relationships or ratios from each other.

(1) Overall structure of disposable diapers

FIG. 1 shows a disposable diaper 10 according to this embodiment. Expansion plan view of the stretched state. Fig. 2 is a plan view showing a natural state of a part (rear end portion side) of the disposable diaper according to this embodiment. Figure 3 is a cross-sectional view of the disposable diaper along the line F1-F1 shown in Figure 1. Figure 4 is a cross-sectional view of the disposable diaper along the line F2-F2 shown in Figure 1.

The stretched state shown in FIG. 1 is a state where the elastic members 81 of the thigh telescoping portion 75 and the thigh side ruffles 80 are stretched to a state where no wrinkles are formed on the surface sheet 50 and the side flaps 70 of the disposable diaper. . On the other hand, in the natural state, when the disposable diaper 10 is sealed in a package, etc., it is taken out of the package, and in this state, it is an environment of 20 ° C ± 2 ° C and relative humidity 60% ± 5% RH. Let stand for 12 hours. In the natural state, the disposable diaper may have wrinkles formed on the surface sheet 50, the side flaps 70, and the like of the disposable diaper.

The disposable diaper 10 is a disposable disposable diaper in the form of a hook and loop. The so-called hook-and-loop shape refers to the outer end of the product in the width direction of the front waist region and the outer end of the product in the width direction of the back waist region. They are not joined before use. A diaper having an adhesive member fixed thereto for engagement.

The disposable diaper 10 includes a front waist region 20, a lower hip region 25, and a rear waist region 30. The front waistline region 20 is a portion that comes into contact with the front waistline (belly portion) of the wearer. The rear waistline region 30 is a portion that comes into contact with the back waistline (back portion) of the wearer. The lower hip region 25 is located between the front waist region 20 and the rear waist region 30.

Moreover, in this embodiment, it is oriented from the front waistline area 20 The direction in which the rear waistline region 30 extends is referred to as the product long side direction L, and the direction orthogonal to the product long side direction L is referred to as the product width direction W.

The disposable diaper 10 includes an absorbent body 40 that extends across the lower hip region 25 and extends from the lower hip region 25 toward at least one of the front waist region 20 and the rear waist region 30. The absorber 40 is composed of an absorptive chip 40a and a chip adhesive film 40b.

The absorbent chip 40a is the same as a conventional disposable diaper, and can be appropriately constructed using a conventional member or material such as pulverized pulp or a superabsorbent polymer. The absorptive chip 40a is surrounded by a thin chip adhesive film 40b.

The chip adhesive film 40b is a sheet covering the absorptive chip 40a. At least a part of the skin surface side of the chip adhesive film 40b is composed of various fibrous nonwoven fabrics or fibrous paper sheets having liquid permeability. For example, air-through fiber nonwovens, spunbond nonwovens, SMS (spunbond, meltblown, spunbond) nonwovens with a mass of about 10 to 30 g / m ² can be used, or a mass of about 10 ~ 30g / m ² fiber paper sheet.

The absorbent body 40 in the back waist region is provided with a low-rigidity portion 110 having a lower basis weight than other parts of the absorbent body, or a low-rigidity region in which the absorbent chip 40a does not exist. The low-rigidity portion 110 has a shape in which the length in the width direction of the product gradually decreases from the center in the width direction of the product at the end portion on the back waist region side of the absorber 40 toward the front waist region side. More specifically, the disposable diaper has a wedge shape when viewed from a plane. In addition, the boundary between the absorptive chip 40a and the low-rigidity portion 110 is formed in a wide direction of the product. Formed by a convex arc in the center. The absorber 40, which is positioned more outward than the low rigidity portion 110 in the product width direction, has a trapezoidal shape with an end portion facing the rear waistline side.

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

The back sheet 60a is disposed closer to the inner side of the product in the longitudinal direction than the front end 10F of the disposable diaper, and closer to the inner side of the product in the longitudinal direction than the rear end 10R of the disposable diaper. . The back sheet 60a is disposed closer to the product widthwise end than the product widthwise end of the disposable diaper. The exterior sheet is a surface disposed on the non-skin contact side of the disposable diaper. The exterior sheet is constituted by, for example, a non-woven fabric.

The side edges of the product in the width direction W of the absorber 40 are each provided with side flaps 70. The side wings 70 span the front waistline area 20, the lower hip area 25, and the back waistline area 30, and are disposed closer to the outer side of the product in the width direction than the absorbent body 40. The side wing 70 is constituted by a single sheet or a plurality of sheets of non-woven fabric stacked on top of each other.

A pair of thigh openings 35 are formed on the side flaps 70 of the disposable diaper 10. The thigh opening 35 is provided on the side of the product in the width direction of the disposable diaper. When the disposable diaper is worn on the wearer, it is arranged along the circumference of the wearer's legs. unit Minute. The thigh opening 35 is recessed toward the center of the product in the width direction of the absorbent body.

Each pair of side flaps 70 is provided with a hook-and-loop fastener 90. The hook and loop fastener 90 is arranged at the outer end of the product in the width direction of the back waist region, and is fixedly adhered to the front waist region. The hook-and-loop fastener 90 extends more outwardly than the side flaps 70 in the width direction of the product. A non-skin abutment surface adhered to the front waistline 20 is fixed to the rear waistline area 30 along the product width direction W, and the disposable diaper 10 is held on the body of the wearer.

The hooked portion 95 is a non-skin abutment surface disposed in the front waist region, and is configured to fix and adhere a pair of hook and loop tapes 90, respectively.

In this embodiment, the waist circumference holding portion is constituted by the front waistline area 20, the rear waistline area 30, and the hook-and-loop fastener 90. The waist circumference holding portion of the rear waistline area 30 is a range extending from the area where the engaging portion of the hook-and-loop fastener 90 is provided in the product width direction. The waist circumference holding portion of the front waistline area 20 is a range extending from the area where the fastened portion 95 is provided in the product width direction.

The side flap 70 is provided with a pair of thighs that are arranged closer to the product width direction inner side than the thigh opening 35 and closer to the product width direction outer side than the absorbent body 40, and are capable of expanding and contracting one of the thighs in the product longitudinal direction L.部 75。 75.

The thigh expansion and contraction portion 75 may be configured so that the thigh opening portion 35 can be extended and contracted in the longitudinal direction of the product. The thigh expansion portion 75 may be arranged along the thigh opening portion 35 or may be partially inclined relative to the thigh opening portion 35. Configuration.

Further, a pair of auxiliary telescopic portions 77 is disposed closer to the outer side in the product width direction than the thigh telescopic portion 75, and is disposed across the hip region 25 and the rear waistline region 30 and retracts in the product longitudinal direction. By shrinking the area of the side flap 70 provided with the auxiliary telescoping portion 77, the side flap 70 will follow the hip of the wearer who is inflated, and the hip can be covered by this area.

In addition, the thigh telescopic portion 75 and the auxiliary telescopic portion 77 are portions that are substantially contracted in the longitudinal direction of the product by an elastic member such as a linear rubber. .

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

The rear-side end portion 75R of the thigh telescoping portion 75 is disposed closer to the front side than the hook-and-loop fastener 90 and closer to the product widthwise inner side than the hook-and-loop fastener. Therefore, with the thigh telescoping portion 75, a region located on the front side and wider inward than the hook-and-loop fastener 90 is contracted.

The front-side end portion 77F of the auxiliary telescopic portion 77 is disposed closer to the rear side than the front-side end portion 75F of the thigh telescopic portion 75. Therefore, with the auxiliary telescopic portion 77, a region located further behind the front-side end portion 75F of the thigh telescopic portion 75 is contracted. The rear end portion 77R of the auxiliary telescopic portion 77 is disposed closer to the rear side than the rear end portion of the thigh telescopic portion. therefore, With the auxiliary telescopic portion 77, a region located further behind than the thigh telescopic portion 75 is contracted.

The thigh telescoping section 75 can be used to raise the lower hip region of the disposable diaper toward the lower hip region of the wearer. Further, the lifting force generated by the thigh telescopic portion can be transmitted to the hook and loop fastener 90 through the auxiliary telescopic portion 77. Therefore, in a state in which the hook and loop fastener 90 is fixed and adhered, the hook and loop fastener 90 is not only held in the area around the waist of the wearer and the region where the thigh expansion and contraction portion 75 is arranged, but also the hook and loop fastener 90 and the thigh are easy to attach The area between the stretchable portions 75 is in close contact with the wearer.

In addition, the auxiliary telescopic section can shrink the region closer to the outside of the product in the width direction than the thigh telescopic section, and the hips can be appropriately covered by the side wings of the back waist area. Therefore, curling at the time of wearing the rear thigh opening can be particularly suppressed. In addition, the thigh opening can be pulled closer to the body by the contraction of the thigh telescoping portion, and displacement of the thigh opening can be suppressed.

The thigh telescopic portion 75 is disposed between the side flap 70 and the exterior sheet 60. Alternatively, in a region including the back sheet 60 a disposed between the absorbent body 40 and the exterior sheet 60, the thigh telescopic portion 75 is disposed between the back sheet 60 a and the side flap 70.

The elongation of the thigh telescopic portion 75 is preferably 1.7 to 2.4 times. In this embodiment, the elongation of the thigh telescopic portion 75 is set to 1.9 to 2.2 times. The elongation refers to the degree of elongation of the thigh telescopic portion, and is defined as follows.

Elongation of the thigh telescopic section = (length of the thigh telescopic section in the extended state) ÷ (length of the thigh telescopic section in the natural state)

The elongation of the auxiliary telescopic portion 77 is preferably 1.6 to 2.4 times. The elongation rate of the auxiliary elastic portion 77 refers to the degree of elongation of the auxiliary elastic portion, and is defined as follows.

Elongation of the auxiliary telescopic section = (length of the auxiliary telescopic section in the extended state) ÷ (length of the auxiliary telescopic section in the natural state)

In addition, in this patent specification, this elongation is measured as follows, for example.

First, when the disposable diaper 10 is sealed in a package or the like, the disposable diaper 10 is taken out of the package. Next, cut out the arrangement area of the measurement object such as the telescopic portion of the thigh. At this time, the outer packaging sheet including the measurement object joined to the thigh telescoping portion is also cut out. The elongation of the cut sample is measured, and the elongation of the measurement object is measured.

Regarding each sample, after being left for 60 minutes in an environment of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH, the length of the measurement object was measured along the stretching direction. Let this length be "the length of the measurement target (thigh extension part etc.) in a natural state."

Second, the length in the direction of expansion and contraction of a predetermined area regarding this state (that is, the natural state), and extending from the natural state to wrinkles caused by the elastic member cannot be visually confirmed on the non-stretchable sheet. The length in the direction of expansion and contraction of the predetermined area in the state is measured. Let this length be "the length of the measurement object (thigh extension part, etc.) in an extended state."

Using these measurement results, the elongation was measured by the above-mentioned numerical calculation.

The measurement of "length" in this patent specification is performed by the following measurement method.

When the disposable diaper 10 is sealed in a package or the like after use, a sample taken out of the package and left in this state in an environment of 20 ° C. ± 2 ° C. and a relative humidity of 60% ± 5% RH for 12 hours is used.

Next, using a spring messure made by Shinwa Rules Co., Ltd. (tape: glass fiber incorporation, vinyl chloride coating), the measurement target portion was measured along the measurement target portion The length of the state. The length in the extended state is measured from the length of the measurement target portion when the disposable diaper 10 is extended from the natural state to a state where wrinkles caused by the elastic member cannot be visually confirmed.

Here, for the ten samples, the above-mentioned measurement was performed in each state, and the average value was taken as the length.

Further, a pair of thigh side hem 80 is provided inside the pair of thigh telescoping sections 75 (located near the center of the product width direction W) and extending along the product longitudinal direction L. The thigh side ruffle 80 is an inner end portion of the product in the width direction of the side wing 70 and is a standing stretch ruffle disposed closer to the product width direction inner side than the thigh telescopic portion 75. The thigh side ruffles 80 are arranged closer to the product widthwise inner side than the thigh telescoping portions 75. The thigh side ruffle 80 may adopt a conventionally known structure, and specifically, may also be configured by a sheet material different from the side flap 70.

Disposable disposable diapers 10, including: The disposable diaper is centered in the width direction of the product and has a stretchable waist stretch sheet in the width direction of the product. The waist circumference stretchable sheet includes a waist waist stretchable sheet 85 disposed at the rear side end portion of the disposable diaper, and a waist waist stretchable sheet 86 disposed at the front end portion of the disposable diaper. Fig. 1 shows an imaginary line L1 that passes through the center of the product in the width direction of the disposable diaper and extends in the longitudinal direction of the product.

The rear end portion 10R of the disposable diaper is, in the natural state of the disposable diaper, the center of the product in the width direction of the rear end portion 10R is wider than the product in the width direction of the rear end portion 10R. A curved shape that is recessed toward the inside of the product's long side. The rear end of the waist waist stretch sheet 85 is located behind the rear end of the disposable diaper. In the natural state, it also has the center of the product width direction more toward the inner side of the product than the product width direction. Depressed curved shape.

In the extended state of the disposable diaper after use (the state shown in Fig. 1), the front-side end portion 85F of the rear waist stretch sheet 85 has a center in the width direction of the product at the front-side end portion 85F than the front side. The outer side of the product in the width direction of the end portion 85F is a curved shape that is recessed toward the outer side of the product in the long side direction. The curved shape of the back waist elastic sheet is not formed in the entire area of the front side end portion 85F, but is formed in the center in the width direction, which is a part of the front side end portion.

The back waist elastic sheet 85 is arranged between one pair of hook-and-loop fasteners located in the width direction of the product. A part of the front side end portion 85F of the back waist elastic sheet 85 overlaps the absorber. Back waist stretch sheet 85 The rear end portion 85R is the same as the rear end portion of the disposable diaper. The product widthwise length of the back waist elastic sheet 85 is longer than the product widthwise length of the absorbent body 40 and longer than the widthwise length of the back sheet 60a. The back waist elastic sheet extends more outwardly than the absorbent body 40 in the width direction of the product, and extends more outwardly than the back sheet 60a in the width direction of the product.

The front-side end portion 10F of the disposable diaper is, in the natural state of the disposable diaper, having the center of the product width direction of the front-side end portion 10F more outward than the product width-direction of the front-side end portion 10F Curved shape with inner side recessed in the long side direction. The front side end portion 86F of the front waist end telescopic sheet 86 located at the front side end portion of the disposable diaper, in the natural state of the disposable diaper, also has: the front end portion 86F has a center in a wider width direction than the front The curved shape of the end portion 86F is recessed toward the inner side of the long side of the product in the width direction.

In the extended state of the disposable diaper after use (the state shown in Fig. 1), the rear-side end portion 86R of the front waist elastic sheet 86 has a product-to-width center ratio of the rear-side end portion 86R. The curved shape of the rear end portion 86R is recessed toward the outside of the product in the width direction. The curved shape of the front waist elastic sheet is not formed in the entire area of the rear end portion 86R, but is formed in the center in the width direction, which is a part of the rear end portion 86R.

The rear end portion 86R of the front waist elastic sheet 86 is adjacent to the absorbent body 40 in the longitudinal direction of the product, and is adjacent to the fastened portion 95. The rear end 86R of the front waist elastic sheet 86 is for the long side of the product It is located further outside than the absorbent body 40 and further outside than the fastened portion 95.

The front-side end portion 86F of the front-side waist elastic sheet 86 is consistent with the front-side end portion of the disposable diaper. The product widthwise length of the front waist elastic sheet 86 is longer than the product widthwise length of the absorber 40 and longer than the widthwise length of the backsheet 60a. The front waist elastic sheet 86 extends more outwardly than the absorbent body 40 in the width direction of the product, and extends more outwardly than the back sheet 60a in the width direction of the product.

In this embodiment, when the waist stretch sheet is stretched in one direction of the sheet, the sheet in which the width of the sheet located in the second direction orthogonal to the extending direction is narrowed (that is, the narrowed length is preferred) is used.

The waist stretch sheet can be a sheet made of a mixture of elastic fibers having elastic elongation and non-elastic fibers having non-elastic elongation, especially having a mass of 20 to 80 g / m ² and preferably 40 to 75 g / m ² quality, more preferably 50 ~ 70g / m ² quality spunbond nonwoven fabric, and its elastic fiber is a monofilament of polyurethane fiber with a fineness of 2-6dtex, and its non-elastic fiber has Monofilaments of at least one of polyolefin fibers, polyester fibers, and polyamide fibers having a fineness of 2 to 6 dtex. The weight mixing ratio of the elastic fibers and the non-elastic fibers is adjusted at 40:60 to 60. : Spunbond non-woven sheet in the range of 40. A non-woven fabric made of a mixed fiber of non-elastic fibers and elastic fibers uses a gear to break a part of the non-elastic fiber layer to show stretchability. As the other waist stretch sheet, as long as it is a thin sheet with a narrow width, it can be easily made into a shape with a narrow width. The waist stretch sheet is not limited to a non-woven sheet, and may be formed of a thin film sheet. Moreover, it is also possible to use a sheet in which the stretchable sheet is formed in advance so that the width in the longitudinal direction of the product can be changed (cut in a convex manner toward the inner side).

The elongation of the back waist elastic sheet 85 is preferably 1.4 to 1.8 times. In this embodiment, the elongation of the back waist elastic sheet 85 is set to 1.5 to 1.6 times. The elongation means the degree of elongation of the back waist stretch sheet, and is defined as follows.

Elongation of the back waist stretch sheet = (length of the side waist stretch sheet after the stretched state) ÷ (length of the side waist stretch sheet after the natural state)

The elongation of the front waist elastic sheet 86 is preferably 1.3 to 1.7 times. In this embodiment, the elongation of the front waist elastic sheet 86 is set to 1.4 to 1.6 times. The elongation means the degree of elongation of the front waist elastic sheet, and is defined as follows.

Elongation of the front waist elastic sheet = (length of the side waist elastic sheet before the stretched state) ÷ (length of the side waist elastic sheet before the natural state)

In this embodiment, the waist stretch sheet is disposed between the exterior sheet 60 and the back sheet 60a. However, in a configuration in which the chip adhesive film 40b extends outside the product in the longitudinal direction of the product than the absorbent chip 40a, a waist stretch sheet may be disposed between the chip adhesive film 40b and the back sheet 60a or the exterior sheet 60. The position of the waist stretch sheet is not particularly limited. Further, in a region where no absorber is 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 with a part of the low-rigidity portion 110 of the absorbent body when the disposable diaper is viewed in plan. Moreover, in this embodiment, the back waist elastic sheet 85 is arranged to overlap a part of the low rigidity portion 110, but the entire waist waist elastic sheet 85 may be arranged to overlap the low rigid portion 110.

By forming such a low-rigidity part 110, the expansion and contraction of the back waist elastic sheet 85 will not be hindered. Even if the back waist elastic sheet 85 contracts, the low-rigidity part 110 will become narrower, and the absorbers on both sides of the product in the width direction will be narrowed. The interval becomes narrower than the low-rigidity portion 110, so the absorbent body 40 is less likely to swell into an unexpected shape. The low rigidity portion 110 is preferably narrower than the width of the back waist stretch sheet 85 in consideration of preventing leakage of excrement.

In addition, the waist stretch sheet according to this embodiment is configured to expand and contract in the product width direction, but the waist stretch sheet may also be configured to expand and contract in the product width direction and the product long side direction.

The hook-and-loop fastener 90 is mounted on the side flap 70 corresponding to the back waistline 30. The hook and loop fastener 90 includes a base sheet 91 connected to the side flap 70 and a hook sheet 92 provided with a plurality of engaging hooks (not shown) as the engaging members and fixed to the base sheet 91. The hook sheet 92 is a region where an engaging member is provided, and the aforementioned waistline holding portion located in the rear waistline region 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 and is specifically bonded to the base sheet 91. The engagement of the hook sheet 92 and the base sheet 91, It is desirable that the rigidity of the hook and loop fastener 90 does not exceed the required strength or more. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 be joined with a hot-melt adhesive intermittently applied in a dot-like, linear, or spiral-like manner. The hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.

The base material sheet 91 is constituted by one sheet or a plurality of sheets of non-woven fabric stacked on top of each other. As the substrate sheet 91, a nonwoven fabric manufactured by a method such as spunbond (SB) or spunbond meltblown spunbond (SMS) can be used. The basis weight of the nonwoven fabric constituting the base material sheet 91 (the total basis weight in the case of a plurality of sheets) is 30 to 120 g / m ² , and preferably 40 to 90 g / m ² .

The hook-and-loop fastener includes a base portion 93 that overlaps the exterior sheet, and an extension portion 94 that extends outward in the product width direction than 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 hook and loop fastener is unfolded. The extension 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 center of the product longitudinal direction of the extension in the product longitudinal direction is consistent with the center of the product longitudinal direction of the base. However, in the natural state of disposable diapers, the position of the hook-and-loop fastener changes with the bending of the back waist elastic sheet 85, and the center of the product longitudinal direction of the extension part is located longer than the product long side of the base part. The center is closer to the outside of the long side of the product.

In addition, in the present invention, the state where the members are overlapped includes not only a state in which the members are directly overlapped with each other, but also a state in which the members are indirectly overlapped with each other (an overlapped state in which other members are sandwiched).

The hooked portion 95 is an exterior sheet provided in the front waistline The non-skin-abutting side of 60. The hooked-and-fastened portion 95 is configured as an engaging hook that can be hooked to the hook-and-loop fastener, and functions as a loop of the hook and loop locking system. As the person to be fastened, for example, air-laid nonwoven fabric can be used.

As the fastened portion 95, for example, a fibrous nonwoven fabric made of a polyolefin-based thermoplastic synthetic resin fiber or a polyolefin-based thermoplastic synthetic resin film can be used. The ring attached to the fastened portion can be formed of a polyolefin-based thermoplastic synthetic resin.

Moreover, as the to-be-fastened portion 95, a non-woven fabric having a high bulkiness can be used, and a part of the non-woven fabric can be embossed to prevent fluffing on the surface of the non-woven fabric.

In addition, the outer sheet 60 of the disposable diaper can be formed by using a non-woven fabric, and the pattern showing the position where the hook-and-loop fastener 90 is installed can be printed on the back sheet 60a or the non-skin contact side of the outer sheet 60. Alternatively, the patterned sheet may be arranged on the non-skin contact side of the back sheet 60a or the exterior sheet 60 to form a hooked portion.

Next, a description will be given of a wearing state of the disposable diaper configured in this way. When wearing disposable diapers, wear a helper and pull the hook-and-loop fastener tape toward the front waistline side. The auxiliary person wears the hook and loop fastener to the front waist area, and fixes the hook and loop fastener to the hooked part.

FIG. 5 shows a state where the disposable diaper according to this embodiment is worn by a wearer. Figure 5 is to fix the fixed adhesive position of the hook-and-loop fastener on the underside of the buttocks and inward in the width direction, and continue to advance the waist area in advance and pull outwards in the width direction. The state of wearing a diaper. By wearing the disposable diaper on the wearer in this way, the front waist area of the disposable diaper can be continuously lifted, and it is easy to cover the bulging belly of the infant.

In addition, by pulling the hook-and-loop fastener toward the front waistline area while wearing, the rear end portion of the disposable diaper is pulled away in a wide direction. FIG. 6 is a view showing a deformed shape of the back waist elastic sheet when the rear waist region of the disposable diaper is pulled apart in a wide direction through a hook and loop fastener. (a) shows the state before deformation, (b) shows the state where it is pulled outward from (a) toward the width direction of the product, and (c) shows the state where the hook-and-loop fastener is pulled again.

In the state before the deformation shown in FIG. 6 (a), the rear end of the disposable diaper is centered in the width direction of the product at the rear end portion and outside at the width direction of the product at the rear end portion. A curved shape that is recessed toward the inside of the product's long side. In the state before deformation, the front end of the back waist stretch sheet is a curved shape in which the center of the product width direction of the front end portion is recessed toward the outside of the product long side than the product width direction of the front end portion. .

When the hook-and-loop fastener is pulled slightly outward in the width direction from the state before deformation, the state shown in FIG. 6 (b) is obtained. By pulling the hook-and-loop fastener toward the front waistline area, the rear end of the disposable diaper is pulled away in a wide direction. In this state, the rear end portion of the disposable diaper is also a curved shape in which the center of the product width direction of the rear end portion is recessed toward the inner side of the product longer side than the product width direction of the rear end portion. . In addition, the front end portion of the rear waist stretch sheet is wider than the product at the front end portion. The center of the width direction is a curved shape that is recessed toward the outside of the product's long side than the width direction outside of the product at the front end.

When the hook-and-loop fastener is pulled slightly outward in the wide direction from the state shown in FIG. 6 (b), the state shown in FIG. 6 (c) is obtained. The rear end of the disposable diaper will be approximately parallel to the width direction of the product. The front side end of the back waist elastic sheet is a curved shape in which the center of the product width direction of the front side end is recessed toward the outside of the product length direction than the product width direction outside of the front side end.

In addition, since the rear end portion of the disposable diaper is in a curved shape in a state before deformation, the length in the width direction of the rear end portion of the disposable diaper is relatively higher than the rear side. The width of the end product is longer in the width direction at a position further inside. Therefore, the rear end portion of the disposable diaper is easy to extend in a wide direction. However, as in the state of FIG. 6 (c), it is pulled outward in the wide direction (when worn by the wearer), and stretched by the waist stretch sheet at the rear end of the disposable diaper. The elongation amount of the waist stretch sheet becomes larger than the position where the rear end portion is closer to the product longitudinal direction (for example, the front end portion of the rear waist stretch sheet). Therefore, the elastic pushing force of the back waist elastic sheet becomes larger as it goes toward the outer side of the product in the longitudinal direction. In the wearing state, with the rear end of the back waist stretch sheet, the waist area can be advanced in advance and pulled outward in a wide direction.

(2) Manufacturing method of disposable diapers

Next, the manufacturing of disposable diapers according to this embodiment will be described. Manufacturing method is an example. For methods not described in this embodiment, existing methods can be used. The manufacturing method described below is only an example, and it can also be manufactured by other manufacturing methods. The method for manufacturing disposable diapers includes at least a component forming step, a component placing step, a leg circumference forming step, and a cutting step.

The manufacturing method of disposable diapers is to manufacture a continuous body in a state where the longitudinal direction of the disposable diaper product is continuous, and cut the continuous body into one along the width direction W of the product. The size of the product to make each disposable diaper.

In the component forming step, the component for forming disposable diapers is formed. Specifically, for example, the absorbent material is laminated | stacked and it shape | molds into the absorber 40.

In the component placement step, other belt-shaped materials such as waist stretch sheets and continuous belt-like materials constituting the surface sheet are placed on the continuous strip-like material constituting the back sheet, the absorbent body, and the thigh telescoping part. 75. The components such as the auxiliary telescopic portion 77 and the like constitute the disposable diaper 10 after use.

At this time, the waist stretch sheet is the front waist stretch sheet 86 of the disposable disposable diaper, and the waist waist stretch sheet 85 of the disposable disposable diaper adjacent to the disposable disposable diaper. Become a state of integration. The both ends of the waist stretch sheet (the part which becomes the outer end in the width direction of the product in the state of being formed into a disposable diaper) are held by suction means or the like, and the waist stretch sheet is discarded after use The product of the shape diaper is stretched in the wide direction and attached to the continuous On a strip. Since the waist elastic sheet is stretched while both ends of the waist elastic sheet are held, the both ends of the waist elastic sheet are hardly stretched. The elongation in the width direction of the product at both ends of the waist stretch sheet is lower than the elongation in the width direction of the product in the area between the two ends.

Specifically, three areas with different elongation rates are formed in the region where the waist stretch sheet of the disposable diaper is disposed. The center of the product width direction in the area where the waist stretch sheet is arranged is the central area, and the product width end of the area in which the waist stretch sheet is arranged (equivalent to both ends of the waist stretch sheet) is the side area. The area between the side areas is regarded as the middle area, and the relationship of elongation is the elongation in the width direction of the product in the central area> the elongation in the width direction of the product in the middle area> the widthwise elongation in the side area rate.

The elongation in the width direction of the product in the central area can be made from 1.4 times to 1.8. The elongation in the width direction of the product in the side region is set to be lower than the elongation in the width direction of the product in the center region, and can be made 1.0 to 1.1 times. The elongation in the width direction of the product in the middle region is set to be lower than the elongation in the width direction of the product in the center region, and higher than the elongation in the side region, which can be made 1.2 to 1.3 times. In addition, the elongation of the product in the width direction of the side region is 1.0 times, and the side region may be a region having substantially no elongation.

In addition, the stretchable sheet that is extended in the width direction of the product is narrowed in length in the direction of the long side of the product. In particular, the stretchable sheet has a narrower center in the width direction. Therefore, the stretchability in the stretched state is thin The length of the long side of the product in the center of the width direction of the product will be shorter than the length of the long side of the product at the end of the width direction of the product. As shown in FIG. 1, the stretchable sheet that is attached in such a narrow and long state is equivalent to the product in the longitudinal direction of the stretchable sheet. The front end of the waist stretch sheet will have a curved shape whose center in the width direction is more recessed than on the outside in the width direction.

In the leg circumference forming step, the front sheet 50, the exterior sheet 60, and the back sheet 60a are cut. As a result, the front-side end portion 77F, which is the auxiliary telescopic portion 77, is cut out and disposed at the thigh opening portion 35 around the leg of the wearer.

In the cutting process, a continuous body including the front sheet 50, the back sheet 60a, the absorber 40, and the like is cut into a product size along the product width direction W. Thereby, the disposable diaper 10 is manufactured.

By cutting the continuum according to the size of each product, the stretched state of the waist stretch sheet and the thigh stretch part disposed on the disposable diaper will be released and become a natural state. If the stretched state is canceled, the waist stretch sheet in a state of being stretched when stretched will be deformed in a manner to restore the state before being stretched. Therefore, the rear end portion of the rear waist elastic sheet and the front end portion of the front waist elastic sheet are linear in an extended state and deformed into a bent state in a natural state.

The front end of the front waist stretch sheet is more contracted than the rear end of the front waist stretch sheet, and it becomes the center of the product in the width direction of the disposable end of the disposable diaper, which is smaller than that of the disposable diaper. The front side of the product is wider toward the inside and the outside is more concave toward the inside of the product. Sinking curved shape. Similarly, the rear end portion of the rear waist stretch sheet is more contracted than the front end portion of the rear waist stretch sheet, and becomes the center of the product in the width direction of the disposable diaper. The curved shape of the rear end of the disposable diaper is recessed toward the inner side of the product in the width direction.

In addition, when the continuous body is cut according to the size of each product and becomes a natural state, the front end portion of the front waist stretch sheet is shrunk more than the rear end of the front waist stretch sheet, and the rear side of the rear waist stretch sheet The end will shrink more than the front end of the back waist stretch sheet. The front end of the front waist elastic sheet is farther from the absorptive chip 40a than the rear end of the front waist elastic sheet, and does not affect the rigidity of the absorptive chip 40a, so it shrinks more. Since the rear end portion of the rear waist elastic sheet is farther from the absorbent chip 40a than the front end portion of the rear waist elastic sheet, and does not affect the rigidity of the absorbent chip 40a, it shrinks more.

(3) Role. effect

The rear-side waist elastic sheet is arranged at the rear end of the disposable diaper, so that it can be easily extended and contracted in a wide direction. In the natural state, the rear end of the disposable diaper is curved. Shape, so the disposable end of the disposable diaper can shrink more easily. When the disposable diaper is worn on the wearer, the front waistline area can be continuously lifted and pulled outwards in a wide direction by a waist stretch sheet at the rear end. For example, even when the position of disposable diapers is shifted, The waist area can also be advanced in advance and pulled outward in a wide direction, which is easy to maintain the protruding state covering the abdomen.

The back waist elastic sheet is arranged on the waist circumference holding portion in an overlapping manner. Preferably, the rear waist elastic sheet is arranged centrally across the product longitudinal direction of the waist holding portion, and more preferably, it is arranged across the lower side end of the product longitudinal direction of the waist holding portion. Since the disposable diaper can be held at the waist-retaining portion of the wearer's body and can be contracted in a wide direction by the waist shrinkage portion, even when the wearing position of the disposable diaper is shifted, The waist-holding portion can be continuously fitted around the abdomen of the wearer.

The rear end portion of the rear waist elastic sheet is not overlapped with the absorber, and the front end portion of the rear waist elastic sheet is overlapped with the absorber. The absorbent body has high rigidity among the constituent members constituting the disposable diaper after use. Therefore, the portion where the back waist elastic sheet overlaps the absorbent body is more difficult to shrink than the portion which does not overlap the absorbent body.

Therefore, the rear end portion of the rear waist elastic sheet is relatively easier to shrink than the front end portion of the rear waist elastic sheet, and it is more effective for lifting the front waist area side when worn.

The rear end portion of the absorber is provided with a low-rigidity portion. By providing the low-rigidity portion, the rear end portion of the absorbent body can be easily expanded in a wide direction, and the rear end portion of the waist stretch sheet can be more easily extended in the product wide direction when worn. Therefore, when the disposable diaper is worn on the wearer, it is more effective to raise the front waistline side by the back waist stretch sheet.

The front end of the disposable diaper may be placed on the protruding part of the wearer's abdomen. At this time, if the front waist end portion is parallel to the wide direction, a curved shape that cannot protrude along the abdomen is conceivable. However, with the curved shape of the front end portion, the front end portion can be arranged along the protrusion of the abdomen.

In the natural state of disposable diapers after use, the center of the product in the longitudinal direction of the extension is closer to the outside of the product in the longitudinal direction than the center of the product in the longitudinal direction of the base. That is, in the natural state of disposable diapers after use, the extending direction of the extension of the hook and loop fastener is not parallel to the width direction of the product, but gradually increases toward the product from the width direction inside to the width direction outside. The sides are inclined outward.

Since the extension portion of the hook and loop fastener is closer to the outer side in the longitudinal direction than the base portion, it is easy to arrange the extension portion closer to the lower hip side than the base portion in a state in which the hook and loop fastener is fixedly adhered to the front side. Therefore, the lifting force generated by the hook and loop fastener is easy to act on the rear side and the upper side.

The back film is disposed closer to the inner side of the product in the longitudinal direction than the rear end of the disposable diaper. The portion where the liquid-impermeable back sheet is disposed is more rigid than the portion where the back sheet is not disposed, and it is difficult to extend.

The disposable end of the disposable diaper will become easier to expand in the wide direction, and it is easier to extend the rear end of the waist stretch sheet in a wide direction when wearing, which can be used for the front waist area when wearing The side uplift works even better.

(4) Other embodiments

As described above, the content of the present invention has been disclosed through the embodiments of the present invention. However, the description and drawings forming part of the disclosure should not be construed as limiting the present inventor. Based on this disclosure, various alternative implementation forms, examples, and application techniques are clear to those skilled in the art.

In the modified example, the back waist elastic sheet may be arranged without overlapping the waist circumference holding portion.

In the modified example, the back waist stretch sheet may not be arranged to overlap the absorber, and the front waist stretch sheet may be arranged to overlap the absorber.

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

In the modified example, the disposable diaper may not include a front waist elastic sheet.

In the modified example, in the natural state of the disposable diaper after use, the center of the product longitudinal direction of the extension may be the same as the center of the product longitudinal direction of the base in the product longitudinal direction, or may be located longer than the product of the base. The orientation center is closer to the inside of the product's long side.

In the modified example, the back film can be extended to the rear end of the disposable diaper, or to the front end of the disposable diaper, or to the product width of the disposable diaper. Width direction end.

As such, the present invention naturally includes various embodiments and the like not described herein. Therefore, the technical scope of the present invention is The statement shall be limited to those specific matters of the invention which are properly related to the scope of the patent claim.

In addition, the entire contents of Japanese Patent Application No. 2013-156030 (filed on July 26, 2013) are incorporated into the patent specification of this application for reference.

[Industrial availability]

A disposable disposable diaper can be provided which can appropriately cover the protruding part of the wearer's abdomen.

Claims (8)

A disposable diaper includes a front waist region, a rear waist region, a hip region located between the front waist region and the rear waist region, and a front waist region toward the rear waist region. The extended product long side direction, the product wide direction orthogonal to the product long side direction, the absorbent body which extends across the lower hip region and extends to at least one of the front waist region and the rear waist region, and is disposed in The outer end of the product in the widthwise direction of the back waist area is fixedly adhered to a pair of hook-and-loop fasteners in the front waist area and the center of the product width direction across the disposable diaper and has The disposable waist diaper is a disposable diaper, which is characterized in that the waist elastic sheet includes a waist waist elastic sheet disposed behind the rear end of the disposable diaper. In the natural state of the disposable diaper, the rear end portion of the disposable diaper is provided with a center in a wider direction of the product than an outer side in the width direction of the product. The curved shape of the product is recessed on the inner side in the longitudinal direction of the product, and the rear end of the rear waist elastic sheet is such that the center in the width direction of the product is more inward than the outer end in the width direction of the product. The shape of the depression, the rear waist stretch sheet is narrowed in the longitudinal direction of the product in a state of being extended in the width direction of the product, and the disposable diaper in the natural state is directed toward the product. When the product is stretched in the width direction, the rear waist stretch sheet is stretched more than the natural state, and the center of the product in the width direction of the front end of the rear waist stretch sheet is longer than the rear waist. The front end of the telescopic sheet has a shape in which the end in the product width direction is more recessed toward the outer side in the longitudinal direction of the product. The disposable diaper as described in item 1 of the scope of patent application, wherein the front waist region and the rear waist region are provided with: extending along the width direction of the product and holding the disposable diaper The rear waist stretch sheet is arranged on the waist circumference holding portion of the wearer's body so as to be superimposed on the waist circumference holding portion. The disposable diaper as described in item 1 or 2 of the scope of patent application, wherein the absorbent body is disposed closer to the inner side of the long side of the product than the rear end of the rear waistline region, and the rear The front side edge part of the side waistline stretchable sheet is arrange | positioned on the said absorber so that it may overlap. The disposable diaper as described in item 1 or 2 of the scope of patent application, wherein the absorbent body is provided with a low rigidity region having a lower basis weight than other parts of the absorbent body or the absence of an absorbent chip, The low rigidity region has a shape in which the length in the width direction of the product becomes shorter from the center in the product width direction of the rear end of the absorbent body toward the front waistline side. The disposable disposable diaper according to item 1 or 2 of the patent application scope, wherein the waist elastic sheet includes: a waist elastic sheet disposed on a front side of the front end of the disposable disposable diaper; In the natural state of the disposable diaper, the front end of the disposable diaper has a curved shape in which the center of the wide direction of the product is recessed toward the inner side of the long side of the product than the outer side of the wide direction of the product. The disposable diaper as described in item 1 or 2 of the scope of patent application, wherein at least the back waist area is provided with an exterior sheet disposed on the non-skin contact surface side of the absorbent body, and the adhesive The buckle includes a base portion which overlaps the exterior sheet, and an extension portion which extends outward in the width direction of the product than the exterior sheet, and in the natural state of the disposable diaper, the extension is provided. The center of the product longitudinal direction of the part is located closer to the product longitudinal direction outer side than the center of the product longitudinal direction of the base. The disposable diaper as described in item 1 or 2 of the scope of patent application, wherein at least the rear waist area is provided with a liquid-impermeable back film disposed on the non-skin contact surface side of the absorbent body. The back film is disposed closer to the inner side of the product in the longitudinal direction than the rear end portion of the back waist area. The disposable diaper as described in item 1 or 2 of the scope of patent application, which includes a central region, a side region, and a middle region. The central region is an area where the waist elastic sheet is disposed. The center of the product in the width direction; the side region, which is the region where the waist elastic sheet is arranged, is located at the end of the product in the width direction, and the middle region, which is the region where the waist elastic sheet is arranged, is located in the central region and Between the side regions, the elongation in the width direction of the product in the central region is higher than the elongation in the width direction of the product in the middle region, and the elongation in the width direction of the product in the middle region, It is higher than the elongation in the width direction of the product in the side region.