JP2000135240A - Brief type disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brief type disposable diaper having favorable junction strength at both side edge parts in forming pants, and having favorable touch and feel to wear. SOLUTION: In this brief type disposable diaper comprising an absorption main body 10 to absorb excrement, and an outer member 7 to hold the absorption main body 10 and form pants, the outer member 7 is formed by laminating an inner layer sheet and an outer layer sheet comprizing nonwoven fabric, expansion elastic members 10 are disposed on opening parts around legs and an opening part around the waist between both sheets, and both sheets are jointed with each other through an adhesive layer intermittently applied in a zone except for both side edge part zones of front and back parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper which is formed in a pants-type in advance, and more specifically, a pants formed by joining opposite side edges of a front body and a back body. In this case, the present invention relates to a pants-type disposable diaper to which a bonding region has good adhesive strength and a good texture is given when worn.

[0002]

2. Description of the Related Art Conventionally, as a disposable diaper, for example, in a side flap of a flat type diaper as disclosed in Japanese Patent Laid-Open Publication No. A so-called pants-type diaper has been proposed in which an opening around the waist and an opening around the leg are provided while being joined and fixed. Also, in such a pants-type disposable diaper, the opening around both legs,
Japanese Unexamined Utility Model Publication No. Hei 3-16920 and Japanese Unexamined Patent Publication No. 4-28 disclose that a stretchable elastic body may be provided on the waist opening and further on both sides of the waist in order to improve the followability and fit of the diaper to the wearer.
363, JP-A-4-166150 and JP-A-4-289201, Japanese Patent No. 2619595,
It is described in Japanese Patent No. 2664501. Such pants-type diapers can be removed by the wearer,
Demand is increasing even when infants are separated from diapers or for adults such as incontinents.

[0003]

SUMMARY OF THE INVENTION
In a pants-type disposable diaper as described in Japanese Patent Publication No. 20 and Japanese Patent Laid-Open Publication No. Hei 4-28363, a telescopic elastic member is provided at the waist opening and the both leg openings. The elastic member narrows the opening, fits the absorber to the wearer, and provides the diaper with a function of preventing leakage from the opening.

[0004] As described above, as a method of arranging the stretchable elastic member along the opening in the stretched state, a hot melt adhesive is applied to at least one of the opposing surfaces of two sheets, and the two sheets are coated. A method of sandwiching a stretchable elastic member between sheets is disclosed, and is widely used in general.

In this case, the elastic members are arranged linearly along the waist opening, or the elastic members are curved and arranged along the leg opening. It is necessary to dispose a hot-melt adhesive in a region of a predetermined width along the leg-surrounding opening so as to be adhered and fixed so as not to be peeled off by the contraction force of the stretchable elastic member in the extended state.

[0006] As a method of joining both side edges to form a pants-type diaper, a method of using heat and pressure fusion bonding or ultrasonic fusion bonding alone or in combination thereof in a bonding region is generally used. Have been.

[0007] In this case, in order to join both side edges in the joining region, it is necessary to melt the joining region as much as necessary so that the joining regions on both side edges are not broken during use. Applying to the area not only reduces the bonding strength because the adhesive placed in the bonding area deprives the heat energy, but also impairs the texture of the bonded sheets and further increases the product manufacturing cost by using it Is not preferred because it leads to

On the other hand, a method of intermittently disposing an adhesive is disclosed in Japanese Patent No. 2713542, but this method is not intended to improve the bonding strength at both side edges of a pants-type disposable diaper. Absent.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the conventional pants-type disposable diaper, and to form both sides of the front body and the back body together to form a good pants-type diaper. It is an object of the present invention to provide a pants-type disposable diaper having an edge joint strength and having a good texture when worn.

[0010]

According to the present invention, there is provided an absorbent body having a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorber disposed between the two sheets.
An exterior member which joins the absorbent body and surrounds the waist from the wearer's belly to the waist when worn to hold the absorbent body against the wearer, and opposing sides of the front body and the rear body of the exterior member A pants-type disposable diaper in which edges are joined to form a waist opening and a pair of leg openings, wherein the exterior member is formed by laminating an inner layer sheet and an outer layer sheet made of a nonwoven sheet. An elastic member is arranged in a stretched state in a region where the waist opening and the leg opening are formed between the outer layer sheet and the inner layer sheet, and the inner layer sheet and the outer layer sheet have a front body. And a pants-type disposable diaper characterized by being joined via an adhesive layer intermittently applied to a region excluding both side edges of the back body.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The pants-type disposable diaper of the present invention is formed by laminating an inner layer sheet made of a nonwoven sheet and an outer layer sheet as an outer member forming the pants.
In this case, the inner layer sheet and the outer layer sheet are both side edge areas of the front and rear bodies of the exterior member to which heat seal bonding is performed to form pants, that is, both side edge areas of the front and rear bodies of the inner layer sheet and the outer layer sheet. It is joined via an adhesive layer intermittently applied to the region to be removed, and furthermore, an elastic elastic member is arranged at the position of the leg opening and the waist opening between the inner layer sheet and the outer layer sheet. I have.

In the pants-type disposable diaper of the present invention having the outer member having such a configuration, since the adhesive does not exist on both side edges of the front and rear body of the outer member, the adhesive may lose heat energy. As a result, heat-sealing bonding is performed with good heat efficiency, and as a result, the pants have excellent bonding strength on both side edges. In addition, since the adhesive between the inner layer sheet and the outer layer sheet is intermittently applied, the air permeability of the exterior member is improved, and stuffiness during wearing is prevented, and further, the leg opening and the waist opening. Since the stretch elasticity of the stretch elastic member disposed on the diaper is good, the fit is good, and a diaper having a good texture and a feeling of wearing when worn can be obtained.

In the present invention, the inner layer sheet and the outer layer sheet forming the exterior member are provided with an adhesive layer intermittently in portions other than both side edge regions of the front and rear bodies, and the adhesive layer is interposed therebetween. The inner sheet and the outer sheet are joined. If the adhesive is present in both side edge regions of the inner layer sheet and the outer layer sheet, the heat energy is deprived by the adhesive when forming the pants by heat sealing the both side edges, and sufficient bonding of both side edges is performed. It is not preferable because the strength cannot be obtained.

As the adhesive used in the present invention, a hot-melt adhesive is advantageously used. In addition, starch-based or carboxymethylcellulose (CM)
Water-soluble glue such as C) or an adhesive having high fluidity can be used. As the hot melt adhesive, a synthetic rubber-based hot melt adhesive, styrene-
Butadiene-styrene copolymers and styrene-isoprene-styrene copolymers can be used.

The application of the adhesive can be performed using a non-contact type spiral spray coater, a curtain spray coater, a contact type roll coater or the like.
Further, the coating shape may be any shape that can maintain the breathability of the exterior member and impart the elasticity of the elastic member, and is not particularly limited, but the inherent flexibility of the nonwoven fabric of the inner layer sheet and the outer layer sheet. And a stripe-shaped thing which can maintain air permeability is preferable.

In the case of a striped adhesive layer, the width of the coated portion is preferably 1 to 3 mm, and the width of the non-coated portion between the coated portions is preferably 1 to 2 mm. . If the width of the coated portion is less than 1 mm, it is not preferable because stable coating cannot be performed. On the other hand, if the width is more than 3 mm, the width of the coated portion becomes too wide and the texture of the exterior member is reduced, which is not preferable. . Further, if the width of the non-coated portion is less than 1 mm, it is not preferable because it substantially does not change from the entire coating, and if it is wider than 2 mm, it becomes difficult to hold the stretchable elastic member in an extended state, which is not preferable. .

The absorbent main body of the pants-type disposable diaper of the present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber. As the liquid-permeable top sheet, a liquid-permeable nonwoven fabric made of synthetic fibers made of polyethylene, polypropylene, polyester, or other thermoplastic resin is preferably used.

The absorbent can be used as long as it is generally used for absorbent articles such as diapers for babies and incontinent persons. Cotton-like pulp and a super absorbent polymer (super absorbent polymer) are used. SAP), and further wrapped by a hydrophilic sheet. Further, a cotton-like pulp may be mixed with a heat-fusible substance in an amount of 3 to 60% by weight and thermocompression-bonded. The configuration of the absorber is not particularly limited, but may be, for example, a single layer containing cotton-like pulp as a main component, or a layer-like material obtained by mixing a highly absorbent material such as SAP with cotton-like pulp. There may be.
Further, a structure in which a uniform layer made of a highly water-absorbing material is sandwiched between two single layers mainly composed of cotton-like pulp may be used.

The amount of SAP is from 10 to 500%, preferably from 15 to 300% of the total weight of the floc pulp in the dry state.
An absorbent is preferred in which such an amount of SAP is substantially uniformly distributed in the fluffy pulp. In such an absorber, when the SAP absorbs moisture and swells, the particles have minimal interference with each other, are less likely to form continuous permeation barriers, and reduce urine and bodily fluids. Transmits and absorbs in the dimensional direction. A hydrophilic sheet disposed above, below, or entirely over the absorber can be used. The hydrophilic sheet may be any sheet that is hydrophilic, for example,
Tissue, absorbent paper, hydrophilic nonwoven fabric, and the like can be used.

Examples of the liquid-impermeable back sheet include a liquid-impermeable polyethylene sheet, preferably a polyethylene sheet having micropores, and a moisture-permeable liquid-impermeable sheet obtained by adding a filler to a thermoplastic resin and stretching. May be used, or a liquid-impermeable sheet and a non-woven fabric may be bonded together, and the one provided with moisture permeability in this way has no fear of stuffiness and is more comfortable.

The shape of the absorbent main body includes an hourglass type, a rectangular type, a T-shaped type, etc., but there is no particular limitation, and any suitable shape that is not too wide or too narrow in the crotch region may be used.

The outer member of the pants-type disposable diaper of the present invention is formed by laminating and bonding an outer layer sheet made of nonwoven fabric and an inner layer sheet made of nonwoven fabric with a stretchable elastic member interposed therebetween. The outer sheet and inner sheet are polyethylene,
A nonwoven fabric made of synthetic fibers made of polypropylene, polyester, or other thermoplastic resin can be used.

The leg-opening elastic member and the waist-open elastic member sandwiched between the outer layer sheet and the inner layer sheet are made of a stretchable elastic material used for ordinary diapers such as urethane thread and thread rubber. The body can be used as it is, and these elastic members are adhered and fixed to predetermined areas in the leg opening and the waist opening in the extended state, respectively.

Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.
FIG. 1 is a perspective view of a pants-type disposable diaper according to an embodiment of the present invention. In the pants-type disposable diaper 1 of the present invention shown in FIG. 1, opposing side edges 6 of a front body 4 and a back body 5 are adhesively closed, and a leg opening 2 and a waist opening 3 are formed. Further, an elastic member is arranged along each opening.

FIG. 2 is a perspective view showing an extended state in which the adhesively closed side edge portion 6 of the pants-type disposable diaper 1 of the present invention shown in FIG. In the vicinity of the peripheral opening 2, a first elastic member 8 made of a plurality of elastic materials provided on the front body 4 and a rear body 5 are provided.
The second elastic member 9 made of a plurality of elastic materials is provided with elasticity, and the elastic member 10 is provided with elasticity near the waist opening. I have.

FIG. 3 is a cross-sectional view showing the pants-type disposable diaper of the present invention shown in FIG. 2 cut along the line XX '. Body 1
3 and an exterior member 7, and the exterior member 7 includes an outer layer sheet 14 made of a nonwoven fabric and an inner layer sheet 15 made of a nonwoven fabric laminated on the outer layer sheet 14, and an opening around the leg between these two sheets. The elastic member 9 is arranged along the line.

FIG. 4 is a plan view showing a state in which a stretchable elastic member is disposed on the exterior member 7 of the pants-type disposable diaper. In FIG. 4, the elastic member at the opening around the leg is a first elastic member 8 composed of a plurality of elastic yarns.
And the second elastic member 9. The first elastic member 8 passes through the center of the crotch region from half of the front body side of one leg opening on the front body 4 side of the exterior member 7. It is arranged over the front body half of the opening around the other leg. In addition, the second elastic member 9 extends from the rear body half of the one leg opening on the rear body 5 side of the exterior member 7 to the rear body half of the other leg opening through the center of the crotch region. It is arranged over. In addition, a waist elastic member 10 made of a plurality of elastic yarns is arranged at the waist opening of the front and rear bodies.

FIG. 5 is a plan view showing an example different from FIG. 4, showing a state in which a stretchable elastic member is arranged on an exterior member 7 of a pants-type disposable diaper. In FIG. 5, the elastic member at the opening around the leg includes a first elastic member 11 and a second elastic member 12, each of which is composed of a plurality of elastic yarns. The second telescopic elastic member 12 is arranged along the other leg opening. In addition, a waist elastic member 10 made of a plurality of elastic yarns is arranged at the position of the leg opening of the front and rear body.

FIG. 6 is a plan view showing a state in which an adhesive is intermittently applied to an outer layer sheet or an inner layer sheet forming an exterior member. In FIG. 6, a hot-melt adhesive is applied in a stripe shape parallel to the width direction in a region excluding both side edges 6 of the front and rear bodies of the exterior member (outer layer sheet or inner layer sheet), and is not coated with the coating portion 16. A processing portion 17 is formed. In this case, the stripe shape may be formed along the longitudinal direction of the exterior member, or may be formed diagonally.
At the position of the waist opening, a coating layer 18 is formed by applying a hot-melt adhesive by curtain coating to a region other than the side edges 6.

FIG. 7 is a plan view showing a state in which the elastic member shown in FIG. 4 is disposed on the exterior member provided with the adhesive shown in FIG. In FIG. 7, first and second elastic members 8 and 9 having openings around the legs are arranged in a region of the exterior member where the adhesive is applied in a stripe shape, and curtain coating is applied to the openings around the waist. A waist elastic member 10 is disposed in the region defined by the waist.

[0031]

The present invention will be described below with reference to examples. Example 1 A heated uneven roll and a heated smooth roll were brought into pressure contact with each other, and the laminated nonwoven fabric was passed through the roll. Formed. That is, a spunbonded nonwoven fabric having a basis weight of 20 g / m ² using polypropylene as a raw material is used as the nonwoven fabric, and two nonwoven fabrics are bonded to each other so that no adhesive is present in a region where the hot-melt treatment is performed. A two-layer nonwoven fabric was produced, and separately, a two-layer nonwoven fabric was produced in the same manner. The two nonwoven fabrics were laminated to form a four-layer nonwoven fabric, which was passed between the rolls to obtain a linear pressure of 350 kg / cm.
Pressurized heat fusion treatment was performed at an uneven roll temperature of 170 ° C., a smooth roll temperature of 160 ° C., and a processing time of 0.01 second to form a 8.5 mm-wide bonding region.

The thus obtained four-layered nonwoven fabric having a joining area was cut into a strip having a width of 25 mm in a direction perpendicular to the joining area, and a 200 mm gap was formed between the two and three layers.
The bond strength is defined as the stress at 180 ° peeling per minute per minute, and a tensile tester [Strograph V manufactured by Toyo Seiki Seisaku-sho, Ltd.]
1-B)].

Comparative Example 1 A hot melt adhesive of 3.0 g / m ² was applied to the area to be subjected to the hot melt treatment under pressure, and two nonwoven fabrics were laminated to produce a two-layer nonwoven fabric. A bonding region was formed in the same manner as in Example 1, and the bonding strength was measured in the same manner as in Example 1.

Comparative Example 2 A hot melt adhesive was applied in an area of 6.0 g / m ² to the area to be subjected to the hot melt treatment under pressure, and two nonwoven fabrics were laminated to produce a two-layer nonwoven fabric. A bonding region was formed in the same manner as in Example 1, and the bonding strength was measured in the same manner as in Example 1.
Table 1 shows the test results.

[0035]

[Table 1]

As is clear from Table 1, the bonding strength was good in the example in which the adhesive was not applied to the bonding area, but the bonding strength was sharp in Comparative Example 1 in which the adhesive was applied at 3 g / m ^2. And the strength further decreased in Comparative Example 2 in which the hot melt adhesive was applied at 6 g / m ² .

[0037]

According to the pants-type disposable diaper of the present invention, since the strength of the heat-sealing adhesive portion when forming the pants is good, the heat-sealing adhesive portion is broken when worn or worn. Because it does not become unusable and because the exterior member has good ventilation, stuffiness during wearing is prevented, and the elasticity of the elastic elastic members arranged along each opening is good. It has good fit, and has a good texture and a feeling of wearing when worn.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pants-type disposable diaper according to the present invention.

FIG. 2 is a perspective view showing a state in which a side edge portion of the pants-type disposable diaper of FIG. 1 is opened and deployed.

FIG. 3 is a cross-sectional view showing a state in which the pants-type diaper shown in FIG. 2 is cut along a line XX ′.

FIG. 4 is a plan view showing a state in which a stretchable elastic member is arranged on an exterior member of a pants-type disposable diaper.

FIG. 5 is a plan view showing an example different from FIG. 4 in which a stretchable elastic member is arranged on an outer member of a pants-type disposable diaper.

FIG. 6 is a plan view showing a state in which an adhesive is intermittently applied to an exterior member of the pants-type disposable diaper.

FIG. 7 is a plan view showing a state in which elastic members around the legs and around the waist are arranged on the exterior member shown in FIG. 6;

[Explanation of symbols]

1: pants-type disposable diaper, 2: leg opening, 3:
Waist opening, 4: front body, 5: back body, 6: joining area, 7: exterior member, 8: first elastic member, 9: second elastic member, 10: elastic member of waist opening , 11:
1st elastic member, 12: 2nd elastic member, 13: absorbent body, 14: outer layer sheet, 15: inner layer sheet, 1
6: Coating part, 17: Non-coating part, 18: Curtain coating part

Claims (1)

[Claims] 1. An absorbent body having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the two sheets, and the absorbent body is joined to form an absorbent body. An exterior member surrounding the waist from the wearer's belly and holding the absorbent body against the wearer, and joining opposite side edges of the front body and the rear body of the exterior member to form a waist opening And a pair of leg-shaped opening diapers, wherein the exterior member is formed by laminating an inner layer sheet and an outer layer sheet made of a nonwoven sheet, and between the outer layer sheet and the inner layer sheet. An elastic member is disposed in an extended state in a region where the waist opening and the leg opening are formed, and further, the inner layer sheet and the outer layer sheet are
A pants-type disposable diaper characterized by being joined via an adhesive layer intermittently applied to regions other than both side edges of the front body and the back body.