TWI602552B - Disposable diapers - Google Patents

Description

Disposable disposable diaper

The present invention relates to a disposable disposable diaper having a buckle that engages a front waistline portion and a rear waistline portion.

Conventionally, a disposable disposable diaper having a buckle for a front waist region and a back waist region has been known (for example, see Patent Document 1). The buckle of Patent Document 1 includes a base material and a hook material that is followed by a part of the surface of the base material. One end of the substrate is joined to the disposable diaper of the disposable paper diaper. On the other hand, the other end of the base material is an extended portion that extends toward the outer end portion in the width direction of the disposable disposable diaper. The hook material is provided in the extension portion, and the hook member is not disposed at the outer end portion in the width direction of the extension portion, and the grip portion that is pinched by the finger when worn is provided.

In addition, as shown in FIG. 12 of the patent document 1, the manufacturing method of the fastening tape is manufactured by cutting the laminated body in which the continuous body of the continuous substrate and the continuous material of the hook material are laminated. The cutting trajectory of the continuous body is a boundary of the base end portion of the extended portion of the buckle which is adjacent to the front end of the extended portion of the buckle. There is no waste material between the buckles adjacent to a buckle, and the material can be effectively utilized.

[prior technical literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-15796

However, the above buckle has the following problems.

The above-mentioned buckle is formed by continuously forming a buckle, and the shape of the front end of the extension of the buckle is the shape of the base end of the extension of the adjacent buckle. For example, in order to easily pinch one end of the buckle, in order to increase the area of one end, it is manufactured in consideration of widening the interval of the adjacent buckles. However, when the interval between the adjacent buckles is widened, the area of the joint portion of the buckle is also increased.

The buckle is generally composed of a member having a high rigidity as compared with a non-woven fabric constituting a surface sheet of the disposable disposable diaper, a pulp constituting the absorbent body, and the like. The buckle is a side flap that is joined to the disposable disposable diaper, and the region where the buckle is joined is more rigid than the periphery. Further, the buckle is joined to the side flaps or the like in the vicinity of the wearer's waist and leg circumference. Therefore, when the joint portion of the buckle is lengthened, the region where the rigidity is high increases, and the feeling of foreign matter at the time of wearing becomes high.

On the other hand, in order to reduce the area of the joint portion and reduce the interval between the adjacent buckles, the area of the stretched portion that is pinched becomes small, and the operability at the time of installation deteriorates.

As described above, the present invention has been made in view of the above problems, and an object of the invention is to provide a foreign body sensation capable of suppressing installation and mounting. Disposable disposable diapers with adjustable operability for the buckle.

The disposable disposable diaper (the disposable disposable diaper 10) of the present disclosure has the gist of: a front waist area; a back waist area; and a position between the front waist area and the front waist area. The underarm region includes: a product length direction from the front waist region toward the rear waist region; and a product width direction orthogonal to the longitudinal direction of the product, and is provided to extend across the armpit region and extend to the front An absorbent body of at least one of a waist region and the back waist region; a side flap that is disposed outside the front waist region, the crotch region, and the back waist region, and is disposed outside the product in the width direction of the product; and Extending from the front waist region of the side flap toward the outer side in the width direction of the product, and engaging a pair of buckles in the front waist region, the buckle having a base sheet joined to the side flap; and providing a snap fit a plurality of engaging members in the front waist region and fixed to the hook sheet of the base sheet, the base sheet having: a joint portion joined to the side flap; and a width wider than the hook sheet a front end portion 96 extending outward in the web direction, a length of the front end portion 96 in the product width direction of 5 to 12 mm, and an outer end portion of the joint portion in the longitudinal direction of the product and an outer side in the longitudinal direction of the product of the hook sheet The length of the product in the longitudinal direction of the end portion is 2 to 12 mm, and the length of the product in the longitudinal direction of the boundary between the hook sheet and the front end portion 96 is the inner end portion of the base sheet in the longitudinal direction of the product and the hook sheet. The hook sheet is an outer end portion in the longitudinal direction of the product in the inner end portion in the width direction of the product of the hook sheet, and the aforementioned end portion of the product in the longitudinal direction of the product. The inner end of the front end portion of the product in the width direction The intermediate point of the outer end portion of the product in the longitudinal direction of the portion extends outward in the longitudinal direction of the product.

10‧‧‧Disposable disposable diapers

20‧‧‧front waist area

20E‧‧‧Outer end

25‧‧‧胯下域

30‧‧‧Back waist area

30E‧‧‧Outer end

35‧‧‧ leg opening

35I‧‧‧Inside end

40‧‧‧ absorber

40a‧‧‧Absorbent core

40b‧‧‧ core cladding

50‧‧‧ top sheet

60‧‧‧Outer sheets

60a‧‧‧back sheet

70‧‧‧Flanking

75‧‧‧ leg extension

77‧‧‧The hip expansion

77F‧‧‧ front end

80‧‧‧Thigh side flap

81‧‧‧Flexible components

85‧‧‧Waist expansion and contraction

90‧‧‧ buckle

91‧‧‧Substrate sheet

92‧‧‧ hook sheet

93‧‧‧Interface

95‧‧‧ Target Department

96‧‧‧ front end

97‧‧‧ convex

98‧‧‧ recess

115‧‧‧ gap

125‧‧‧ gap

200‧‧‧Under the expansion and contraction department

L‧‧‧Products long direction

W‧‧‧ product wide direction

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

Figure 2 is a cross-sectional view of the disposable disposable diaper taken along the line F1-F1 shown in Figure 1.

Fig. 3 is a cross-sectional view of the disposable disposable diaper taken along the line F2-F2 shown in Fig. 1.

Fig. 4 is a plan view of the buckle according to the embodiment.

Fig. 5 is a view for explaining the manufacturing process of the buckle.

[Formation for carrying out the invention]

Next, an embodiment of the disposable disposable diaper 10 of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar elements are denoted by the same or similar reference numerals. However, if the drawing is a pattern, it is necessary to pay attention to the case where the ratio of each size is different from the actual one.

Therefore, the specific dimensions and the like must be judged by referring to the following description. Further, even in the drawing planes, portions having different dimensional relationships and ratios are included.

(1) The overall outline shape of the disposable disposable diaper

Fig. 1 is a developed plan view of the disposable disposable diaper 10 of the embodiment. Figure 2 is a cross-sectional view of the disposable disposable diaper taken along the line F1-F1 shown in Figure 1. Fig. 3 is a cross-sectional view of the disposable disposable diaper taken along the line F2-F2 shown in Fig. 1. The expanded plan view shown in Fig. 1 is an example in which the elastic member 81 of the leg stretchable portion 75 and the thigh side flap 80 is extended to a state in which the top sheet 50 and the side flaps 70 of the disposable diaper are not wrinkled. A diagram of the state.

Disposable disposable diaper 10 has: front waist area 20, 胯 Lower field 25, back waist area 30. The front waist region 20 is a portion that is connected to the front waist portion (abdominal portion) of the wearer. Further, the front waist region 30 is a portion that is connected to the wearer's back waist region (back portion). The underarm region 25 is located between the front waist region 20 and the back waist region 30.

Moreover, the disposable diaper 10 is formed with a pair of legs after use. Opening 35. The leg opening portion 35 is provided at the side end portion of the disposable diaper in the wide direction of the product, and the disposable disposable diaper is worn in the wearer's state, and is worn along the wearer's leg circumference. The part of the configuration.

In addition, in this embodiment, it is from the front waist area 20 toward The direction toward the rear waist region 30 is referred to as the product length direction L, and the direction orthogonal to the product length direction L is referred to as the product width direction W.

The disposable disposable diaper 10 is provided with a cross-armpit field 25, and The armpit region 25 extends toward the absorber 40 in at least one of the front waist region 20 and the back waist region 30. The absorbent body 40 is composed of an absorbent core 40a and a core The cladding 40b is formed.

The absorbent core 40a is a disposable disposable diaper Similarly, a known member such as pulverized pulp or a superabsorbent polymer or a material can be suitably used. The absorbent core 40a is wrapped by a sheet-like core cladding 40b.

The core cladding 40b is a sheet covering the absorbent core 40a. At least part of the skin surface side of the core clad layer 40b is composed of various liquid non-woven fabrics or tissue sheets having liquid permeability. For example, a hot air fiber nonwoven fabric having a mass of about 10 to 30 g/m ² , a spunbonded nonwoven fabric, an SMS (spunbond-meltblown-spunbond) nonwoven fabric, or a tissue sheet having a mass of about 10 to 30 g/m ² can be used.

It is provided on the surface side (skin contact surface side) of the absorber 40 A liquid permeable top sheet 50. Moreover, the back surface sheet 60a which is liquid-impermeable is provided in the back surface side (non-skin contact surface side) of the absorber 40.

The side edge portion in the width direction W of the product of the absorbent body 40 Do not have a wing 70. The side flaps 70 span the front waist region 20, the underarm region 25, and the back waist region 30, and are disposed outside the product width direction than the absorber 40. The side flaps 70 are constituted by one or two or more sheets of non-woven fabrics stacked one on another. Further, each of the pair of side wings 70 is provided with a buckle 90.

The buckle 90 is a pair and is along the product in the back waist region 30 The wide-width direction W extends and the disposable disposable diaper 10 is held by the wearer's body by the non-skin abutting surface of the front waist region 20. The configuration of the buckle will be described in detail later.

The target portion 95 is a pair and is disposed in the front waist region. The non-skin abutting faces are formed, and the pair of buckles 90 are respectively engaged.

In this embodiment, the front waist region 20 and the back waist region are used. 30. The buckle belt 90 constitutes a waistline holding portion. The waistline holding portion of the back waist region 30 extends from the region where the engaging member of the buckle 90 is provided to the wide direction. The waistline holding portion of the back waist region 20 is a range extending from the region where the target portion 95 is provided to the wide direction.

Moreover, the disposable disposable diaper 10 is provided with a weight The underarm telescopic portion 200 is stacked in the region of the absorbent body of the underarm region 25. In addition, the structure of the underarm expansion-contraction part 200 is demonstrated in detail later.

The side flap 70 is provided with more than the leg opening portion 35 A pair of leg expansion and contraction portions 75 that are expandable and contractible in the longitudinal direction L of the product in the product width direction.

The leg expansion and contraction portion 75 is in the product longitudinal direction L than the underarm expansion and contraction portion The length of 200 is longer, and it is disposed in the product width direction W at the outer side than the underarm elastic portion 200.

The leg expansion portion 75 can be in the product as long as it constitutes the leg opening portion 35 It may be stretched in the longitudinal direction, or may be disposed along the leg opening portion 35, or may be disposed in a state of being inclined with respect to the leg opening portion 35.

Further, the leg expansion and contraction portion 75 is made of a stretchable sheet, a rubber thread, or the like. Composition. The leg stretchable portion 75 is a portion that substantially contracts in the longitudinal direction of the product, and conceptually removes a portion in which the stretchable sheet is disposed in a state where the contraction force is not exerted.

Moreover, on the inner side of the pair of leg stretchable portions 75 (product width) The vicinity of the center of the direction W is a pair of thigh side flaps 80 extending along the longitudinal direction L of the product. The thigh side flap 80 is provided on the side flap 70 The inner end portion of the product in the width direction is a standing stretch hem that is disposed on the inner side in the width direction of the product more than the leg stretch portion 75. The thigh side flap 80 is disposed on the inner side in the width direction of the product more than the leg stretch portion 75. The thigh side flap 80 can be configured by a conventionally known structure, and specifically, can be composed of a sheet material different from the side flaps 70.

Moreover, a pair of buckles 90 are provided between the pair of products in the width direction. The waist elasticized portion 85 which is expandable and contractible in the wide direction of the product. The waist elasticized portion 85 is contracted in the width direction between the buckles 90.

In the embodiment of the present embodiment, the waist elastic-contraction portion 85 is stretchable. Made up of sheets. The member constituting the waist elastic-contraction portion 85 is not particularly limited, but may be used as thin as possible and has low bending rigidity, and is preferably small in a reduction ratio. The waist elastic portion 85 is formed of a material having low bending rigidity, whereby the waist elastic portion 85 is easily bent along the body, and the waist elastic portion 85 can be attached to the body without causing a load on the wearer's body. Moreover, the waist elastic-contracting portion 85 is formed of a material having a small neck-reduction ratio, thereby suppressing the shrinkage of the disposable diaper in the longitudinal direction of the product when the product is stretched in the wide direction, and suppressing disposable diapers after use. The wearer's waist is lowered toward the lower side of the squat.

In the present embodiment, a stretchable film having a basis weight of 20 to 45 g/m ² is used as the waist stretchable portion 85.

The waist elastic portion 85 is elongated to a non-elongated state (natural After 1.5 to 2.5 times the length of the state), the sheet 60 is then attached to the exterior by a hot melt adhesive or heat treatment.

In the present embodiment, the waist elastic-contraction portion 85 is disposed outside. The sheet 60 is placed between the sheet 60 and the back sheet 60a. However, when the core clad layer 40b is configured to extend outward in the longitudinal direction of the product from the absorbent core 40a, the waist elasticized portion 85 may be disposed between the core clad layer 40b and the back sheet 60a or the exterior sheet 60. The position of the waist elasticized portion is not particularly limited. Further, in a region where the absorber is not disposed, it may be disposed between the side sheet 70 and the back sheet 60a or the exterior sheet 60.

Further, the waist elastic-contraction portion of the present embodiment is formed in a system. The product can be stretched in the width direction, but the waist elastic portion can also be stretched in the product width direction and the product length direction.

(2) The composition of the buckle

Next, the configuration of the buckle 90 will be described in detail based on Fig. 4 . 4 is a top plan view of the buckle 90. The buckle 90 is mounted in a region corresponding to the side flaps 70 of the rear waist portion 30. The buckle 90 includes a base sheet 91 that is coupled to the side flaps 70, and a hook sheet 92 that is provided with a plurality of engaging members (not shown) and that is fixed to the base sheet 91. The hook sheet 92 is a region in which an engaging member is provided.

The hook sheet 92 is fixed to the substrate sheet 91, specifically Engage. The joining of the hook sheet 92 to the base sheet 91 is preferably such that the rigidity of the buckle 90 is not unnecessarily increased. Specifically, it is preferable that the hook sheet 92 and the base sheet 91 are joined by a batch-coated hot-melt adhesive such as a dot, a wire or a spiral. Further, the hook sheet 92 and the base sheet 91 may be joined by heat sealing or the like.

The base sheet 91 is composed of a nonwoven fabric in which one or two or more sheets are stacked. As the base sheet 91, a nonwoven fabric produced 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 sheet 91 (the total basis weight at the time of the plurality of sheets) is 30 to 120 g/m ² , and preferably 40 to 90 g/m ² .

Further, when the base sheet 91 is formed of a laminate of a plurality of laminated nonwoven fabrics, a nonwoven fabric having a basis weight of 10 to 80 g/m ² can be used, and a nonwoven fabric of 15 to 75 g/m ² can be more preferably used. In order to ensure the strength (breaking strength) of the buckle, and to form a soft sheet, a plurality of non-woven fabrics are formed by laminating a plurality of non-woven fabrics, and the joint portion and the non-joining portion on the joint surfaces can be softened. Buckle belt.

The substrate sheet 91 is disposed on the side flaps 70 and the exterior sheet 60 There is a first region R1 in which the side flaps are disposed to overlap, and a second region R2 that extends outward in the product width direction than the side flaps. Further, the base sheet may be connected to at least the side flaps, or may be connected to the side flaps 70 and the exterior sheet 60 without being connected to the exterior sheet.

The substrate sheet 91 has a joint portion joined to the side flaps 93; and a front end portion 96 extending outward from the hook sheet 92 in the width direction of the product. The joint portion 93 of the base sheet 91 of the embodiment of the present embodiment is a region joined to the side flap 70 or the exterior sheet. The joint portion 93 is provided in the first region R1. Further, although the joint portion 93 is provided in a part of the first region R1, it may be provided in the entire region of the first region R1. The front end portion 96 extends outward in the width direction of the product from the hook sheet 92, and includes an outer end portion in the width direction of the buckle belt 90.

The width direction W of the product of the front end portion 96 of the base sheet 91 The length L11 is 5~12mm. The distal end portion 96 is a portion in which the hook sheet 92 is not provided and the buckle belt 90 is caught in the target portion, and is not caught in the target portion. The front end portion 96 is a portion that is clamped by the installer when the release belt 90 is worn. Therefore, it is preferable that the front end portion 96 is a size that the installer can easily pinch. According to the front end portion 96 of such a size, the installer can pinch with a finger and smoothly perform the sewing and detaching operation of the buckle 90. Further, by the installer's positive gripping of the distal end portion 96, fine adjustment of the attachment position of the buckle 90 is possible, and the attachment can be performed at a desired position. Therefore, the operability at the time of installation can be improved.

The distance L12 between the outer end portion of the joint portion 93 in the longitudinal direction of the product and the outer end portion of the hook sheet in the longitudinal direction of the product is 2 to 12 mm. The hook sheet is a portion that is caught at the target portion, and the hooking force can be increased by widening the area of the hook sheet. However, in the conventional buckle 90, when the area of the hook sheet is to be increased, the area of the joint portion 93 of the joint buckle 90 is widened, and the area having high rigidity is increased, which causes a feeling of discomfort to become high.

However, the distance L12 between the outer end portion of the joint portion 93 in the longitudinal direction of the product and the outer end portion of the hook sheet in the longitudinal direction of the product is set to 2 to 12 mm, whereby the engaging force of the hook sheet can be obtained, and the joint can be suppressed. The portion 93 causes discomfort when worn.

Moreover, the length L13 of the product in the longitudinal direction of the boundary between the hook sheet and the tip end portion 96 is the distance L14 between the inner end portion of the base sheet 91 in the longitudinal direction of the product and the inner end portion of the hook sheet in the longitudinal direction of the product. More than 2 times. The leg opening portion 35 surrounding the wearer's leg circumference is formed in a state in which the buckle 90 is caught in the target portion 95. The buckle belt 90 is formed with a leg opening In the state of the portion 35, it is located in the vicinity of the leg opening portion 35. Therefore, when the wearer moves the leg, the buckle 90 will touch the wearer's leg. In particular, the inner end portion of the base sheet 91 in the longitudinal direction of the product easily comes into contact with the wearer's leg.

Moreover, the inner end portion of the base sheet 91 in the longitudinal direction of the product is a region where the engaging force with the target portion is not placed. Therefore, it is desirable that the inner end portion of the base sheet 91 in the longitudinal direction of the product and the inner end portion of the hook sheet in the longitudinal direction of the product are shorter in the longitudinal direction of the product, and the shorter the shorter, the shorter the shortening is not to be placed with the target portion. The area of the clamping force makes it difficult for the buckle to touch the wearer's leg.

Further, the buckle belt 90 has a tapered shape in which the length in the width direction of the product in the width direction of the product in the width direction of the product is shortened. Therefore, the boundary between the hook sheet and the front end portion 96 is the shortest length of the product of the hook sheet in the longitudinal direction. The length L13 of the product in the longitudinal direction of the boundary between the hook sheet and the tip end portion 96 is defined as the distance L14 between the inner end portion of the base sheet 91 in the product length direction and the product end direction of the inner end portion of the hook sheet in the product length direction. Two times or more, it is possible to suppress the contact with the wearer and secure the engagement force.

Further, the hook sheet is an outer end portion in the longitudinal direction of the product in the inner end portion in the width direction of the product of the hook sheet, and an outer end portion in the product longitudinal direction of the inner end portion in the product width direction of the distal end portion 96. The intermediate point C1 extends further outward in the longitudinal direction of the product. The hook sheet is a tapered shape in which the length in the width direction of the product from the inner side in the width direction of the product toward the outer side in the width direction of the product is shortened. Therefore, at the inner end portion of the product of the hook sheet in the width direction, The hooking member has a different engaging force than the outer end portion in the wide direction of the product of the hook sheet. Therefore, the clamping force of the entire hook sheet is uneven.

Further, in a state in which the leg opening portion 35 is formed, the buckle belt 90 is located in the vicinity of the leg opening portion 35, and when the wearer moves the leg, the buckle belt 90 acts to peel off from the target portion. At this time, the force by which the buckle 90 is peeled off from the target portion acts from the leg opening portion 35 side. When the difference between the engaging force of the inner end portion in the wide direction of the product of the hook sheet and the engaging force in the wide direction of the product of the hook sheet is large, the buckle 90 is moved in a direction in which the portion having a strong engaging force is rotated as a starting point. The position and direction of the waist area and the back waist area will be offset.

However, the outer end portion of the inner end portion in the wide direction of the product in the wide direction of the product of the hook sheet and the outer end portion of the inner end portion of the front end portion 96 in the wide direction of the product in the longitudinal direction are more toward the middle point of the outer end portion of the product in the longitudinal direction. Since the product extends outward in the longitudinal direction, the area of the outer side of the width direction of the product of the hook sheet can be approached in the region outside the width direction center of the hook sheet, and the engagement force can be suppressed. All.

The hook sheet is an outer end portion in the longitudinal direction of the product from the boundary between the first region and the second region, and an intermediate point C2 at the outer end portion in the product length direction of the outer end portion in the product width direction of the second region. Extending outward in the long direction. Although the length of the product of the buckle 90 in the longitudinal direction is gradually shortened toward the outer side in the width direction of the product, for example, when the inner side in the width direction of the root portion of the buckle 90 is too short, the area of the front end portion 96 may not be secured, or The consideration of the engagement force of the hook sheets on the side of the front end portion 96 cannot be ensured. However, the outer end of the product is longer than the boundary between the first region and the second region. The intermediate portion C2 of the outer end portion in the product longitudinal direction of the outer end portion in the wide direction of the product in the wide direction of the second region extends outward in the longitudinal direction of the product, so that the area of the distal end portion 96 side of the buckle 90 can be increased. .

The outer shape of the second region of the base sheet is a curved shape. The second region of the substrate sheet is a region that extends from the side flaps and is a portion that is in contact with the hand when installed. The outer shape of the second region of the base sheet is a curved shape, thereby suppressing the stimulation of the opponent and improving the operability. Further, when the end portion of the base sheet is not intended to touch the leg or the hand, the stimulation of the leg or the like and the line pressure caused by the end portion of the buckle can be kept low. Further, at least a part of the outer shape of the second region of the base sheet may have a curved shape, and a part of the outer shape of the second region of the base sheet may have a linear shape.

It is desirable that the distance L15 between the hook sheet 92 and the joint portion 93 is 2 to 12 mm. Since the joint portion 93 is joined to the side flap, the hook sheet 92 is caught in the target portion 95 in a state in which the disposable disposable diaper is attached, so that the hook sheet 92 and the joint portion 93 are provided for mounting. In the state of the disposable disposable diaper, there is no fixed area which is easily deformed. When the distance between the hook sheet 92 and the engaging portion 93 is too long, the wearer is easily deformed when the wearer moves the leg, and the engagement state of the buckle 90 is not easily maintained. On the other hand, when the distance between the hook sheet 92 and the joint portion 93 is too short, there is a case where the wearer does not deform when the wearer moves the leg, and there is a case where the wearer's free movement is hindered. Since the distance between the hook sheet 92 and the joint portion 93 is 2 to 12 mm, free movement can be ensured, and the engagement state of the buckle 90 can be maintained.

Formed toward the end of the product of the base sheet in the longitudinal direction The convex portion 97 having a shape protruding outward in the longitudinal direction of the product; and the concave portion 98 having a shape recessed toward the inner side in the longitudinal direction of the product are desirable. By providing the convex portion 97 and the concave portion 98, when a force for deforming the base sheet is applied, stress can be dispersed at the end portion in the longitudinal direction of the product. The apex of the convex portion 97 is an outer end in the longitudinal direction of the product at the inner end portion in the product width direction of the outer end portion in the product length direction and the outer end portion of the inner end portion in the product in the wide direction of the product of the hook sheet. The middle point of the part is located further outside the width direction. Further, since the end portion of the base sheet has a curved shape of the convex portion 97 and the concave portion 98 in the longitudinal direction end portion, the irritation to the wearer's skin is reduced, and the wearer's discomfort can be reduced.

The convex portion and the concave portion have a curved shape. The convex portion and the concave portion are continuously present at the end portion of the base sheet in the longitudinal direction of the product, and the convex portion and the concave portion have a curved shape, whereby the outer end portion of the buckle can be retained when it is not intended to touch the leg or the hand. Low stimulation of the legs and the like and the line pressure at the end of the buckle.

The engagement force between the buckle and the front waist is 0.3N/30mm~1.5N/30mm. As a result of various verifications by the applicant of the present case, when the engaging force of the buckle exceeds 1.5 N/30 mm, the tester (the mother with the infant) tends to have an impression that the adhesion is difficult to remove. On the other hand, when it is smaller than 0.3 N/30 mm, it is known that the buckle is not easily caught in the disposable diaper main body, and even if the buckle does not fall off, there is an impression that the buckle is detached. Therefore, it is not ideal. Therefore, the engagement force between the buckle and the front waist is ideal from 0.3N/30mm to 1.5N/30mm.

Hereinafter, the measurement of the "engagement force" in the present specification is performed by the following measurement method.

The kneading force was measured using an autostereograph tester (AG-X10plus) manufactured by Shimadzu Corporation. in particular, A sample of the hook sheet and the base sheet was cut out from the buckle of the measuring object when the width was 30 mm (when it was not cut out at a width of 30 mm and judged to be converted to a width of about 30 mm). Also, it is prepared to cut a sample of the target portion (outer sheet) to which the buckle is fastened by a larger size than the hook sheet.

Next, two samples were pressure-bonded by moving 700 g of the roller (diameter 85 mm, width 45 mm) mainly at a speed of 5 mm/min. The two samples of the crimping were set to the clamping force (unit: N/30 mm) of two samples at a tensile speed of 300 mm/min measured by an autostereoscopic tester. At this time, the stretching direction was set to an angle of 135° with respect to the target sheet surface. Moreover, the direction in which the hook sheet is detached is the main direction when the buckle is detached from the target portion.

Hereinafter, the measurement of the "length" in the present specification is performed by the following measurement methods.

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

Then, a length of the disposable disposable diaper 10 in the state of the disposable diaper 10 was measured along the measurement target portion using a spring gauge (a tape piece: a polyvinyl chloride coated with glass fiber) manufactured by Affinity Measurement Co., Ltd. Here, for the ten samples, the above measurement was performed in the state of each sample, and the average value thereof was used as the length.

(3) The shape of the underarm telescopic part

Next, the shape of the underarm expansion and contraction unit 200 will be described. The underarm elasticizing portion 200 constitutes a flat shape that can maintain a part of the underarm region more than other portions of the absorbent body 40 when the disposable disposable diaper is worn. shape. The underarm elasticizing portion 200 is configured to be expandable and contractable at least in the product longitudinal direction L or in the product width direction W.

The underarm expansion and contraction portion 200 is independent of the leg expansion and contraction portion 75 The absorbent core 40a is disposed at a position overlapping the absorbent core 40a (in the present embodiment, the position between the core cladding 40b and the back sheet 60a of the absorbent core 40a is wrapped). The length in the width direction shrinks by more than 60%. As described above, the portion in which the absorbent core 40a is disposed is contracted by the crotch expansion-contraction portion 200, whereby the absorbent core 40a is shrunk, and the flat shape is easily maintained as compared with the portion where the absorbent core 40a is not shrunk.

On the other hand, it is located longer than the underarm expansion and contraction unit 200. The front waist region on the outer side and the absorbent core 40a on the rear waist region are not shrunk by the underarm elastic portion 200. Therefore, by the state in which the buckle 90 is held by the wearer's waist and waist, the underarm elastic portion 200 of the disposable diaper is maintained in a flat shape without excessively adhering to the buckle. The body, as a result, the underarm telescopic portion 200 is appropriately arranged along the body.

Moreover, the underarm expansion and contraction portion 200 can extend along the longitudinal direction of the product At the time of contraction, the front waist region 20 and the back waist region 30 are easily raised by the contraction of the underarm elastic portion 200, and a flat underarm region along the body can be formed in the wearer's crotch portion when worn.

As a result, since the front waist area 20 and the back waist area 30 are from Since the armature expansion-contraction part 200 stands up, the disposable disposable diaper 10 improves the fit of the wearer.

That is, it can be stabilized by the contraction of the underarm elastic portion 200. Disposable disposable diaper 10 after use, and disposable diaper 10 after use The underarm region 25 is disposed in the lower portion of the wearer's armpit.

Furthermore, the underarm telescopic portion 200 can also constitute a cross-product rectangular The center of the disposable disposable diaper 10 of L is extended to the front waist region 20 side and the back waist area 30 side.

Moreover, the center of the armpit expansion-contraction part 200 of the product longitudinal direction L It is disposed on the side of the front waist region 20 more than the center of the disposable disposable diaper 10 in the longitudinal direction L of the product.

On the other hand, when the wearer has an action (especially, in a sleeping position) When the foot is raised, or when standing or sitting, the amount of expansion and contraction of the skin on the surface of the wearer's body (the amount of change in length) is larger on the back side (hip) than on the ventral side.

By the middle of the underarm telescopic portion 200 of the product in the longitudinal direction L The heart is disposed on the front waist region 20 side at the center of the disposable disposable diaper 10 in the longitudinal direction L of the product, and the product longitudinal direction L of the back waist region 30 in the natural state of the disposable disposable diaper 10 can be used. The length is set to be longer than the length L of the product in the front waist region 20. Therefore, even if the wearer has an action, the influence of the action of the wearer's skin can be suppressed, and the front waist region 20 and the back waist region 30 of the disposable disposable diaper 10 are oriented in the longitudinal direction L along the product. The state of affairs.

The underarm elastic portion 200 is formed of a stretchable sheet ideal.

Forming the underarm telescopic portion 200 by the stretchable sheet The absorptive core 40a in the region in which the stretchable sheet is placed is similarly reduced, and the flat shape is kept easier. In addition, the stretchable sheet is for example borrowable It is composed of the same stretchable sheet as the leg stretchable portion 75.

Also, by configuring a plurality of strips of polyurethane elastic fiber Instead of such a stretchable sheet, a linear or band-shaped elastic member formed of a natural rubber or a natural rubber constitutes the underarm elastic portion 200. At this time, in order to reduce the absorbent core 40a by the crotch expansion-contraction part 200, the distance between the elastic members can be set to 7 mm or less, and more preferably 5 mm or less. Further, in order to similarly reduce the absorptive core 40a, the difference in the interval between the adjacent elastic members is desirably 2 mm or less.

Moreover, the elongation of the underarm elastic portion 200 is specifically It is ideally 1.2 times or more and 1.8 times or less. In the present embodiment, the elongation of the underarm elastic portion 200 is set to 1.4 times. The elongation is the degree of expansion and contraction of the expansion and contraction direction (the product length direction L) of the underarm elastic portion 200, and is defined as follows.

The elongation is the direction of expansion and contraction (in this embodiment, it is a system) The degree of expansion and contraction of the underarm elastic portion 200 in the product length direction L) is defined as follows.

Elongation = (the length of the expansion and contraction direction of the underarm elastic tube 200 in the maximum stretch state) / (the length of the expansion and contraction direction of the underarm elastic tube 200 in the natural state)

In addition, since the measurement of the elongation is the same as that of the leg expansion-contraction part mentioned above, description is abbreviate|omitted.

By setting the elongation of the underarm elastic portion 200 to 1.2 times or more and 1.8 times or less, the stretch of the wearer's skin can be appropriately followed.

For example, the wearer takes the forward side of the body to contract forward In the curved posture, the skin on the buttocks side of the wearer has an elongation of about 30% with respect to the state of stretching the body.

That is, the elongation of the underarm elastic portion 200 is set at 1.2 times. In the following, the contraction of the underarm elastic portion 200 in the natural state is insufficient, and the shrinkage of the absorbent region of the crotch portion of the discarded disposable diaper 10 is small compared to the case where the underarm elastic portion 200 is not provided, and the wearer is small. The condition of the crotch to get along the flat shape of the body is not sufficient.

On the other hand, the elongation of the underarm elastic portion 200 is set. When it is larger than 1.8 times, since the contraction dimension of the contraction direction of the underarm elastic portion 200 becomes too large, the region where the underarm elastic portion 200 exists is likely to be in a state of being closer to the body than the body, and is discarded after use. The disposable diaper 10 is easily offset toward the underside of the wearer.

Further, the product longitudinal direction L of the underarm elastic portion 200 may be formed. The amount of shrinkage is 2 to 8% of the length of the product in the longitudinal direction L of the disposable disposable diaper 10.

In addition, the amount of shrinkage is that the wrinkles become sufficiently small and are The surface of the present surface is stretched to a difference between the length "b (mm)" in a state close to the smooth state and the length "a (mm)" in a natural state along the direction of the expansion and contraction direction of the sample, and can be obtained by (ba) Calculated.

The inventor of the present invention has the product length direction L of the underarm elastic portion 200. When the amount of shrinkage is set to 2 to 8% of the length L of the product in the longitudinal direction L of the disposable disposable diaper 10, it is confirmed that the underarm is stretched during the process of disposing the disposable disposable diaper 10 for the wearer. The portion 200 is easily ideally along the wearer's body.

Here, the product of the armature expansion and contraction unit 200 has a longitudinal direction L. When the contraction amount is set to be larger than 8%, the underarm elastic portion 200 is excessively retracted, and the length of the product longitudinal direction L of the disposable disposable diaper 10 is insufficient, so that the disposable disposable diaper 10 is not easily installed. The wearer's body, or the disposable disposable diaper 10, and the wearer's body tend to deviate too much in the underarm region 25.

On the other hand, the product length direction L of the underarm expansion and contraction portion 200 When the amount of shrinkage is set to 2% or less, it is difficult to express the effect of the so-called underarm elasticizing portion 200 in which the disposable disposable diaper 10 approaches the wearer's body after use.

Moreover, the center of the armpit expansion-contraction part 200 of the product longitudinal direction L It is disposed on the side of the front waist region 20 more than the center of the disposable disposable diaper 10 in the longitudinal direction L of the product. Further, the underarm elasticizing portion 200 is disposed at the center of the disposable disposable diaper 10 which is spanned in the product longitudinal direction L.

In this case, considering the rigidity of the absorbent core 40a and The rigidity of the other member constituting the disposable disposable diaper 10 can be appropriately selected from the thickness of the elastic member to be used and the gap to be disposed, and the disposable diaper 10 can be used in a natural state (non-stretched state). In the meantime, it is preferable that the entire edge portion of the product width direction W of the absorbent core 40a is in a contracted state.

Further, a notch 115 is formed in the underarm region 25 of the absorber 40. (Gap 125). The notch 115 and the notch 125 are regions where the absorbent core 40a constituting the absorber 40 does not exist. In the present embodiment, the notch 115 and the notch 125 correspond to the basis weight of the absorbent core 40a than the absorbent core 40a. The other part is lower in the lower rigid part. Further, instead of forming the notch 115 and the notch 125, the region of the notch 115 and the notch 125 may be formed such that the basis weight of the absorbent core 40a is lower than the other portions of the absorbent core 40a.

The notch 115 and the notch 125 are formed along the lower portion 200 of the crotch The edge of the product length direction L exists. Further, even if the notch 115 and the notch 125 are formed, the absorbent core 40a located in the front waist region 20 and the back waist region 30; and the absorbent core 40a positioned in the underarm region 25 need not be completely cut away, especially in the wide direction. Continuous is ideal.

The notch 115 and the notch 125 are oriented toward the width of the product The length of the W outer product longitudinal direction L (the natural state of the disposable disposable diaper 10) becomes wider. With such a shape, since the product of the absorbent core 40a is more easily reduced in the width direction W, it is easier to form a flat "bottom". Further, the absorbent core 40a which is located closer to the front waist region 20 than the notch 115, and the absorbent core 40a which is located closer to the back waist region 30 than the notch 125 are raised from the "bottom" and are easily formed along the gap. The wearer's body (abdomen and buttocks) curves curvedly, so that disposable disposable diapers can be shaped closer to the shape of the wearer's body.

Also, the front waist region 20 of the notch 115 (notch 125) (post The edge near the waist region 30) has an arc shape. The edge of the notch 115 (notch 125) is a shape in which the center of the circular arc is located further in the rear waist region 30 (front waist region 20) than the edge portion. According to such a shape, deformation of a curve along the wearer's body is more easily and significantly produced.

(4) Method for manufacturing disposable disposable diaper

Next, an example of a method of producing an absorbent article according to the present embodiment will be described. Further, as for the method not described in the embodiment of the present embodiment, an existing method can be used. Moreover, the manufacturing method demonstrated below is an example, and it can manufacture by another manufacturing method. The method for producing an absorbent article includes at least a component forming process, a component component mounting project, a leg circumference forming project, and a cutting process.

Forming parts to form an absorbent article The constituent parts. Specifically, for example, a absorbing material forming absorbent body 40 and a molded buckle 90 are laminated. The buckle 90 is formed by cutting a laminate.

Figure 5 is a view for explaining the manufacturing process of the buckle 90, and is The pattern indicates a cut-off view of the laminate 100. The laminate 100 is a sheet material in which continuous hook sheets having continuous hook sheets are fixed to a continuous substrate sheet in which a base sheet is continuous. The MD shown in Fig. 5 is the transport direction of the laminate, and the CD is the cross direction. The dimension of the laminate in the cross direction is nearly twice the width direction of the product of the buckle 90. The cutting trajectory of the laminate is a state in which the buckle 90 is adjacent to each other in the intersecting direction and is connected to the buckle 90 in the conveying direction. The buckle 90 is cut out from the laminate, whereby the trimming between the buckles 90 in the state before the cutting is produced. In Fig. 5, the area of the trimming is indicated by a diagonal line.

The trimming is continuous in the conveying direction, and the rule of the cross direction of the trimming Inch changes. Therefore, there are regions where the tensile strength is different in the trimming. For example, the A region shown in FIG. 5 has a tensile strength lower than that of the B region. The trimming is a part that is discarded after the buckle 90 is cut out, and it is ideal for the viewpoint of recycling for disposal. Also, when cutting the trim, use mechanical cutting Processing such as breaking processing. At this time, when the trimming is continuous, there is a concern that the machine is involved. However, since the trimming portion is provided with a region having a different tensile strength, it is easy to separate a region having a relatively low tensile strength during mechanical processing. Therefore, the buckle 90 of this type can be manufactured, whereby the trimming can be recovered in a continuous state during the recovery, and the trimming can be finely cut when the force is applied during the mechanical processing, so that the disposal can be smoothly performed.

In the component mounting project, the fiber constituting the back sheet On the mesh, a stretchable sheet constituting the leg stretchable portion 75, another web such as a web constituting the top sheet, and a disposable diaper 10 such as a leakage preventing sheet, an absorbent body, and a leg stretch portion 75 are placed. The constituent parts.

The leg circumference forming project is to cut the top sheet 50 and the outer casing thin Sheet 60 and back sheet 60a. Thereby, the leg opening portion 35 disposed in the leg circumference of the wearer is formed.

In the cutting process, it will be configured along the width direction of the product W The continuous body having the top sheet 50, the back sheet 60a, the absorber 40, and the like is cut into a product size. Thereby, the disposable disposable diaper 10 is manufactured.

(5) Comparative evaluation

Tables 1 and 2 show the comparative evaluation results of the buckles. As shown in Tables 1 and 2, tests were performed on the buckles of Examples 1 to 7 and Comparative Examples 1 to 4.

As shown in Table 1, for Examples 1 to 3 and Comparative Example 1 and 2 buckles for comparative evaluation. In the comparative evaluation test, the buckles of Examples 1 to 3 and Comparative Examples 1 and 2 were used by using a commercially available disposable disposable diaper "Nightly Sleeping S Size" manufactured by U.S.A. The buckle was changed to a disposable disposable diaper to prepare a sample for evaluation.

In the evaluation test, it is the usual use of your beautiful and beautiful In the case of the mother of the disposable diaper, "Sleeping at night, the S size", the sample was installed and replaced in the usual way, and it was asked whether "the front end portion of the buckle is easily replaced". In addition, the test is performed by changing the sample to the subject. In this way, it is inquired whether the subject who is performing the test is easy to replace or difficult to replace for the "nighttime stable sleep S size" that is normally used.

For this inquiry, the ratio of the number of people in the following (1) exceeds 70% of the samples showed good sensory evaluation (tactile sensation) and were evaluated as ○. In addition, in the sample of the following (1) ratio of 70% or less, the sensory evaluation (feel) was not very good, and it was evaluated as ×.

(1) Easy to replace

(2) not easy to replace

According to the result of the evaluation test, the length of the product in the width direction of the tip end portion is preferably in the range of 5 to 12 mm.

As shown in Table 2, the fastener tapes of Examples 4 to 7 and Comparative Examples 3 and 4 were comparatively evaluated. In the comparative evaluation test, the buckles of Examples 4 to 7 and Comparative Examples 3 and 4 were used by using a disposable disposable diaper "Nightly stable sleeping S size" manufactured by Youjia Jiaomei Co., Ltd. The buckle was changed to a disposable disposable diaper to prepare a sample for evaluation. Further, as the base material sheet, a spunbonded nonwoven fabric having a basis weight of 70 g/m ^{2 and} a spunbonded nonwoven fabric laminated sheet having a basis weight of 20 g/m ² were used.

In the evaluation test, it is the usual use of your beautiful and beautiful For the mother of the disposable diaper, "Sleeping at night, S size", the baby's skin is installed and replaced in the usual way, and the mother confirms the joint of the buckle after use. After the state (with or without redness), a five-stage evaluation was made for "whether or not the baby's legs are soft."

The ratio of the number of people in the following (1) or (2) More than 70% of the samples had a good sensory evaluation (feel) and were evaluated as "◎". The sample with a ratio of more than 60% of (1) or (2) was a sensory evaluation (feel) and was evaluated as " ○". The sample evaluation (tactile sensation) in which the ratio of the number of persons (1) or (2) was 60% or less was not very good, and was evaluated as "x".

(1) very good

(2) slightly better

(3) Can't tell

(4) not very good

(5) totally bad

As a result of such an evaluation test, the distance between the outer end portion of the base sheet 91 of the joint portion in the longitudinal direction of the product and the outer end portion of the hook sheet in the longitudinal direction of the product is preferably in the range of 2 to 12 mm.

(6) Other embodiments

The above description of the present invention is not intended to limit the scope of the present invention. It should be apparent to those skilled in the art that various alternative embodiments, embodiments, and operational techniques are available.

As described above, the present invention naturally includes various embodiments and the like which are not described herein. Therefore, the technical scope of the present invention is only by the specific matters of the invention from the scope of the proper patent application described above. decision maker.

In addition, the entire contents of Japanese Patent Application No. 2012-247993 (filed on November 12, 2012) are incorporated by reference in the present specification.

[Industrial Availability]

It is possible to provide a disposable disposable diaper which can suppress the uncomfortable feeling during installation and also has a buckle which can improve the operability at the time of installation.

R1‧‧‧1st area

R2‧‧‧2nd area

L13‧‧‧ Length of product in the long direction

96‧‧‧ front end

98‧‧‧ recess

C2‧‧‧ intermediate point

97‧‧‧ convex

C1‧‧‧ intermediate point

92‧‧‧ hook sheet

Long distance of L12‧‧‧ products

93‧‧‧Interface

Long distance of L14‧‧‧ products

L15‧‧‧ distance

L11‧‧‧ length

Claims (8)

A disposable disposable diaper having: a front waist region; a back waist region; and an underarm region located between the front waist region and the rear waist region, and having: from the front waist region toward the front a longitudinal direction of the product in the waist region; and a product width direction orthogonal to the longitudinal direction of the product; and an absorber that extends across at least one of the front waist region and the front waist region; a side wing that is disposed outside the front waist region, the underarm region, and the rear waist region, and is disposed outside the product in the width direction of the product; and the outer waist region of the side wing toward the outer side of the product width direction Extending out a pair of buckles that are locked in the front waist region, the buckle having a base sheet joined to the side flaps; and a plurality of engaging members that are engaged in the front waist region and are a hook sheet fixed to the base sheet, the base sheet having a joint portion joined to the side flap; and a front end portion extending outward in the width direction of the product from the hook sheet, The length of the product in the width direction of the end portion is 5 to 12 mm, and the distance between the outer end portion of the joint portion in the longitudinal direction of the product and the outer end portion of the hook sheet in the longitudinal direction of the product is 2~ 12 mm, the length of the aforementioned product in the boundary between the hook sheet and the front end portion The length is such that the inner end portion of the base sheet in the longitudinal direction of the product is twice or more the distance from the longitudinal direction of the inner end portion of the hook sheet in the longitudinal direction of the product, and the length of the product of the base sheet is long. a convex portion having a shape that protrudes outward in the longitudinal direction of the product, and a concave portion that is recessed toward the inner side in the longitudinal direction of the product, and the hook sheet is an inner end in a width direction of the product of the hook sheet The outer end portion of the product in the longitudinal direction of the product and the intermediate portion of the inner end portion of the front end portion in the product width direction of the product in the longitudinal direction of the product extend outward in the longitudinal direction of the product, and the convex portion The apex is an outer end portion in the longitudinal direction of the product in the inner end portion in the width direction of the product of the hook sheet, and an outer end portion in the longitudinal direction of the product in the inner end portion of the front end portion in the product width direction of the front end portion. The intermediate point is located further outside the aforementioned wide direction. The disposable paper diaper according to the first aspect of the invention, wherein the base sheet is provided with a first region in which the side flap is disposed and provided with the joint portion, and a flank a second region extending toward the outer side in the width direction of the product, and having the front end portion and the hook sheet, wherein the hook sheet is an outer end of the product in a longitudinal direction from a boundary between the first region and the second region The intermediate portion of the outer end portion in the longitudinal direction of the product in the wide direction of the product in the second region extends outward in the longitudinal direction of the product. Disposable disposable urine as described in item 2 of the patent application scope In the cloth, the outer shape of the second region of the base sheet is curved. The disposable diaper according to any one of claims 1 to 3, wherein the distance between the hook sheet and the joint portion is 2 to 12 mm. The disposable disposable diaper according to claim 1, wherein the convex portion and the concave portion have a curved shape. The disposable diaper according to any one of claims 1 to 3, wherein the base sheet is formed of a nonwoven fabric having a basis weight of 30 to 120 g/m ² . The disposable diaper according to any one of claims 1 to 3, wherein the base sheet is a laminated body of a plurality of non-woven fabrics having a basis weight of 10 to 80 g/m ² . form. The disposable diaper according to any one of claims 1 to 3, wherein the engaging force of the buckle and the front waist region is 0.3 N/30 mm to 1.5 N/30 mm.