JPH08182704A - Briefs type disposable diaper - Google Patents

Abstract

PURPOSE: To improve ease of handling by achieving higher readiness to peel (tear) a seal part in a briefs type disposable diaper having a stretching side panel. CONSTITUTION: A body 10 includes a liquid permeable surface sheet 11, a liquid impermeable rear sheet 12 and an absorbing body 13 interposed between both the sheets. The body 10 is divided into a belly side part positioned on the belly side of the person wearing this diaper, a rear side part positioned on the back side and a crotch part and stretchable side panels 20 are joined securely on both left and right side rim parts of the belly side and the rear side part. The stretchable side panels 20 of the belly side part and the rear side part are joined together securely to form a waist opening and a pair of left and right leg openings. The stretchable side panel 20 is 3,000gf/30mm or more in the vertical strength of a diaper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pants-type disposable diaper for infants, incontinent persons or adults.

[0002]

2. Description of the Related Art In recent years,
Demand for pants-type disposable diapers is increasing, especially for babies who can walk. As a cause of this, there is a problem that it is difficult to wear with a conventional flat type diaper, while with a pants type disposable diaper, the baby can be pulled up and removed while the baby is standing up, and the mother wears it on the baby. It is thought that this is because the user-friendliness of is greatly improved.

As the above-mentioned pants-type disposable diaper,
For example, by a pair of left and right side flaps formed on both sides along the longitudinal direction of the main body, the ventral side portion and the back side portion are joined and fixed to each other to form a pair of left and right leg openings and one waist opening. A so-called pants-type disposable diaper formed is proposed (Japanese Patent Laid-Open No. 61-2076).
No. 05).

The underpants-type disposable diaper described above is constructed so that the pair of left and right leg openings described above can be freely expanded and contracted to fit the body shape, and is usually worn by the wearer himself in a standing position. Therefore, it is used for toilet training to promote "diaper habit" of infants, or for incontinence or ambulatory adults. Further, the above-mentioned pants-type disposable diaper is characterized in that the wearer can raise and lower it by himself / herself as in ordinary underwear, as compared with a so-called flat-type diaper. However, in order to prevent the wearer from giving excrement and to be able to easily wear it, the pants-type disposable diaper is required to have an excellent fit property, and further, it is necessary for the wearer to have active activities. It is also required to have sufficient followability.

In order to meet such a demand, Japanese Patent Laid-Open No. Hei 2
No. 4364 discloses an elastic side panel (side member) on a side portion for adhering a ventral side portion and a back side portion of a main body.
And a pants-type disposable diaper in which elastic members are arranged at the abdominal end and the dorsal end of the main body.

[0006] However, such a pants-type disposable diaper has a drawback that it is difficult to dispose at the time of defecation in terms of usability. That is, in the flat type diaper,
By removing the tape after use, it can be easily attached and detached even during defecation. On the other hand, in the above-mentioned pants-type disposable diaper, it is necessary to tear the joint between the front and back parts of the diaper (of course, it is possible to pull out and remove the foot, but stool may attach to the baby's skin).
However, since it is easy to concentrate the force on this portion, it is desirable that the joint portion be firmly joined in the mounted state. In the conventional pants-type disposable diaper, the joint portion has too high strength, and the joint portion is too strong. There is a problem that it requires a considerable amount of force to tear. In addition, there is a problem in that, at the time of tearing, it does not tear at the joint portion but tears at the joint portion between the side panel and the diaper body.

Therefore, in order to solve these problems, a diaper in which the seal pattern of the joint portion has a specific pattern is proposed in Japanese Utility Model Laid-Open No. 6-31721. However, this diaper does not solve the above problems. Not even,
The seal pattern becomes complicated and process management becomes complicated. Further, it has been proposed to solve the problem by setting the bonding strength of the bonded portion within a specific range, but it has not been possible to solve the above problem.

Further, it is proposed in Japanese Utility Model Laid-Open No. 1-141711 to provide perforations beside the bonded portion in order to improve the ease of tearing in a broad sense. According to this proposal, the easiness of tearing is certainly improved, but the diaper may be torn at the perforations during wearing and the diaper may be peeled off.

That is, a technique for solving the above problem has not been proposed yet, and such a technique is currently demanded.

Therefore, an object of the present invention is to improve the ease of peeling (tearing) the seal portion of a pants-type disposable diaper having an elastic side panel, and to improve the usability of the pants-type disposable diaper. To provide.

[0011]

The present invention relates to a disposable diaper having a main body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the two sheets. The main body is divided into an abdominal part located on the ventral side of the wearer when worn, a dorsal part located on the back side, and a crotch part, and the left and right sides of the abdominal part and the dorsal part are respectively separated. A stretchable side panel is joined and fixed to the side edge portion, and the stretchable side panel of the ventral side portion and the stretchable side panel of the back side portion are joined and fixed to form a waist opening and a pair of left and right leg openings. Part and is formed,
The stretchable side panel achieves the above object by providing a pants-type disposable diaper characterized by having a longitudinal strength of 3000 gf / 30 mm or more in the diaper.

[0012]

According to the pants-type disposable diaper of the present invention, the side panel forming the seal portion has a strong strength in the longitudinal direction of the diaper and is not torn in the width direction of the diaper, so that the seal portion is torn. Can be done easily.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing an embodiment of the pants-type disposable diaper of the present invention, and FIG. 2 is a partially cutaway development view of the disposable diaper shown in FIG.

As shown in FIGS. 1 and 2, the disposable diaper 1 of this embodiment has a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and an absorbent body interposed between these sheets. And a main body 10 including 13 and 13. The body 10 is a ventral side portion C located on the ventral side of the wearer when worn.
And a dorsal part A located on the back side and a crotch part B, and elastic side panels 20, 20 'on both left and right side edges of the abdominal part C and the dorsal part A, respectively. Are joined and fixed, and the both side edges are composed of a sheet including the elastic side panels 20, 20 ', that is, the elastic side panels 20, 20', the topsheet 11, and the backsheet 12. . Further, the elastic side panel 20 of the ventral side portion C and the elastic side panel 20 ′ of the back side portion A are joined and fixed, and the waist opening portion 15 and the pair of left and right leg opening portions 17, 17 ′ are formed. Has been formed.

More specifically, the absorbent body 13 will be described.
Has a rectangular shape, and is sandwiched and fixed by the top sheet 11 and the back sheet 12. In addition, a strip-shaped leg elastic member 2 is provided on the longitudinal side of the absorber 13.
2, 22 'are the top sheet 11 and the back sheet 12
The elastic members 22 and 22 'are contracted in a free state to form leg gathers so that they can fit in the crotch region as shown in FIG. Further, the waist elastic members 23, 23 'and the waist elastic members 21, 21 are provided in the waist opening vicinity D and the waist area E located around the waist of the wearer at the time of wearing on the abdomen C and the back A. 'Is arranged, and the ventral side portion C and the back side portion A are the elastic side panels 20,
A gather that is substantially continuous is formed over the entire circumference of the peripheral portion of the diaper through 20 '.

Next, materials and the like of the respective constituent members of the disposable diaper according to this embodiment will be described. Surface sheet 1 above
1 is preferably a liquid-permeable sheet that allows excrement to permeate into the absorbent body 13 and has a feeling close to that of underwear. Examples of such a liquid-permeable sheet include woven cloth, nonwoven cloth, and porous film. Used.

As the back sheet 12, a liquid-impermeable and vapor-permeable film sheet obtained by adding a filler to a thermoplastic resin and stretching, or a fiber assembly is used.

The absorbent body 13 is preferably composed of defibrated pulp as a main material and a high-molecular water-absorbing polymer in combination. In addition, a mixture of thermoplastic resin, cellulose fiber, high-molecular water-absorbing polymer, etc. is heat-treated. Those are preferably used. The high-molecular water-absorbing polymer may be present in any of the upper layer, the middle layer, and the lower layer of the absorber, or may be a mixture with pulp. The high-molecular water-absorbing polymer is preferably in the form of particles having a property of absorbing 20 times or more of its own weight of liquid and having a gelling property,
Preferred examples of such high-molecular water-absorbing polymers include saponified starch-acrylic acid (salt) graft copolymers, crosslinked sodium carboxymethyl cellulose, acrylic acid (salt) polymers, and the like.

As the leg elastic members 22 and 22 ', elastic bodies made of natural rubber, synthetic rubber, polyurethane foam or the like can be used without particular limitation. Further, in the present embodiment, the example in which the band-shaped body is used has been described, but one or a plurality of thread-shaped elastic bodies may be provided.

Further, the back side portion A is provided with a waste tape 30 on the surface of the back sheet 12 at a substantially central portion thereof. The waste tape 30 is preferably an ordinary tape material coated with an adhesive. For example, the waste tape 30 has a length necessary for rolling and processing a bulky diaper after use, and is folded into a Z shape. A waste tape having a structured structure is preferably used. The pressure-sensitive adhesive may be a conventional pressure-sensitive adhesive, for example, styrene-butadiene block copolymer, styrene-isoprene block copolymer, acrylic ester, acrylic copolymer, vinyl acetate, ethylene-vinyl acetate copolymer. A hot melt resin or emulsion such as is used. Further, as the waste tape 30, a tape composed of a tape material that is joined to the tape adhering region by a physical structure such as a magic tape may be used. Since the disposal tape 30 is provided, after the bowel movement or the like, the diaper body can be rolled and stopped compactly with the disposal tape 12 for disposal, and the bowel movement can be trapped in the diaper body for hygiene. Can be processed and easily discarded.

Thus, the disposable diaper 1 of this embodiment is
As shown in FIG. 2, the main body 10 includes an abdomen C located on the abdomen of the wearer when worn, and a dorsal A located on the back.
It is divided into a crotch portion B, and elastic side panels 20, 20 'are joined and fixed to the left and right side edge portions of the abdominal side portion C and the back side portion A, respectively. Bonding and fixing of the stretchable side panels 20, 20 'to both side edges may be done by heat sealing, ultrasonic sealing, adhesive sealing or any other suitable means.

Further, as shown in FIG. 1, the elastic side panels 20, 20 of the ventral side portion C and the elastic side panels 20 ', 20' of the back side portion A are respectively the elastic side panels 20. The side surface sheet 11 side of the elastic side panel 20 'and the side edge surface sheet 11 side of the elastic side panel 20' are brought into contact with and fixed to each other, whereby the waist opening 15 and the pair of left and right legs. Openings 17 and 17 'are formed. In addition, 31 is a band-shaped seal part formed by the above-mentioned joining fixation. Further, the above-mentioned joining and fixing can be performed by heat sealing, ultrasonic sealing, joining with an adhesive, or any other suitable means.

The disposable diaper 1 of this embodiment is
The elastic side panel 20 has a longitudinal strength of 3000 gf / 30 mm or more, preferably 40 in the longitudinal direction of the diaper.
The range is from 00 gf / 30 mm to 9000 gf / 30 mm, and in this embodiment, it is 6000 gf / 30 mm.
When the strength is less than 3000 gf / 30 mm, when peeling off the seal portion 31 in the longitudinal direction when discarding the diaper, a crack is formed in the width direction of the diaper, which makes it difficult to peel off. In addition, the above-mentioned strength has a measurement width of 30 mm and a pulling speed of 30 when the chuck distance is 100 mm.
It is the maximum value when measured under the condition of 0 mm / min.

The joint strength of the seal portion 31 [the seal portion 31 is cut into a width of 30 mm in the lengthwise direction to prepare a sample, and the obtained sample is subjected to a pulling speed of 300 mm / min. Maximum (extreme limit) when pulled in the arrow direction shown in FIG.
Force] is preferably 1000 to 3000 gf / 30 m
m, more preferably 1200 to 2500 gf / 30 m
m. In this embodiment, the average value is about 1400 gf / 30.
mm. The above bonding strength is 3000 gf / 30 mm
If it exceeds, it is difficult to practically peel off (tear) the seal part 31, and the seal part 31 is torn from the joint part with the main body of both side panels, and the texture of the seal part becomes very hard, so that the baby's The skin may become red.
If it is less than 1000 gf / 30 mm, there is a high possibility of peeling (tearing) at the time of mounting, so it is preferable to set it within the above range.

Further, the joint strength of both side edge portions of the ventral side portion and the back side portion is preferably 1000 gf / 30 mm or more.

Further, in the disposable diaper 1 of the present embodiment, the waist elastic members 23, 2 in the form of belts are provided in the vicinity of the waist opening D in the abdominal portion C and the back portion A.
3'is arranged in parallel to the edge of the waist opening, that is, the front and rear waist portions 14 and 14 ', and the waist portion E includes the thread-like waist portion elastic members 21 and 21'. Four pieces are provided in each of the portion C and the back side portion A, parallel to the front and rear waist portions 14 and 14 ', and the back sheet 12 is provided.
And the absorber 13 are arranged so as to be sandwiched therebetween. By arranging the waistline elastic members 21 and 21 ′ and the waist elastic members 23 and 23 ′, the belly side portion C and the back side portion A have the elastic side panel 2 respectively.
0,20 ', over the entire circumference of the diaper,
That is, in the pants-type disposable diaper, a substantially continuous gather is formed on the outer peripheral surface of the portion that comes into contact with the waist and waist of the wearer (the surface of the backsheet 12 mainly including the waist opening vicinity D and the waist E). Has been done.

As the stretchable side panel 20.20 ', a block copolymer of polystyrene, polyisoprene or polybudadiene, a copolymer of ethylene, natural rubber, urethane, and a mixture / coextrusion of these is used. One layer of woven fabric, one formed of a non-woven elastic material or elastic material, a film of elastic material, or a composite of elastic material can be used. Furthermore,
Stretch bonded laminates that are elastic in all directions, breathable and vapor permeable liquid impermeable may also be used. The above-mentioned laminated material is preferably a stretchable material, for example, a melt-blown product or film of a block or graft copolymer of butadiene, isoprene, styrene, ethyl acrylate-ethylene or a mixture thereof, or a spun-bonded nonwoven fabric of urethane. Alternatively, the elastic or stretchable layer may be stretched to an extension, the unstretched layer is placed on the stretched elastic layer, the layers are bonded together, and the elastic layer gathers the other layers. Those made by relaxing the layers are preferred. The stretchable side panels 20 and 20 ′ include stretchable, breathable, non-stretched film and a longitudinally carded fiber web in the longitudinal direction, above and below the film. It is also possible to use a laminated material which is formed by linearly bonding by a bonding means such as heat sealing, ultrasonic sealing, or an adhesive. This type of laminated material allows a mother or child to spread laterally once in use so that the fiber web in the non-line-bonded portions is broken and relaxed to gather.

Further, the waistline elastic members 21, 2 are provided.
As the material for forming 1'and the waist elastic members 23, 23 ', the same elastic body as that for forming the leg elastic members 22, 22' can be used.

Further, in the disposable diaper of the present invention, the waist elastic member near the waist opening and the waist elastic member of the waist portion have different contraction stresses, and the stress at the time of 50% elongation is different. It is preferable to have a relation of size of waist opening> waist circumference. Further, in the disposable diaper of the present invention, 50 between the back side portion and the abdominal side portion in the waist opening portion.
It is preferable that the stress at the time of% elongation is different. Specifically, the contraction stress of the elastic member near the waist opening is set to 1
The stress when stretched by 20% to 200% is preferably 30 g / 2.
5 mm width to 300 g / 25 mm width, more preferably 1
It is desirable that the width is 00 g / 25 mm width to 200 g / 25 mm width, and the contraction stress of the elastic member in the waistline portion is smaller than the contraction stress of the elastic member in the waist opening.

In order to manufacture the disposable diaper of this embodiment, it can be easily prepared by arranging each constituent member at a predetermined portion by a generally known method.

Next, another embodiment of the pants-type disposable diaper of the present invention will be described with reference to FIGS. 4, 5, 6 and 7. The points that are not particularly described are the same as in the above-described embodiment. FIG. 4 is a development view (corresponding to FIG. 2) showing another embodiment of the pants-type disposable diaper of the present invention, and FIGS. 5, 6 and 7 further show the pants-type disposable diaper of the present invention. Development view showing another embodiment (FIG. 2)
(Corresponding figure).

The disposable diaper 1a shown in FIG. 4 has a waist elastic member 23a, 23a 'near the waist opening D.
Are thread-like, three at a predetermined interval and at the end edge of the waist opening 15a, that is, the front and rear waist portions 1
4a and 14a 'are arranged substantially parallel to each other. When the waist elastic members 23a and 23a 'and the waist elastic members 21a and 21a' are formed by using a plurality of elastic materials as described above, the numbers thereof are not particularly limited.

The disposable diaper 1b shown in FIG. 5 has a waist elastic member 23b, 23b 'near the waist opening D.
Are thread-like, three at a predetermined interval and at the edge of the waist opening 15b, that is, the front and rear waist portions 1
4b, 14b 'are arranged substantially parallel to each other, and the waistline elastic members 21b, 21b' of the waistline E are arranged.
Are arranged so as to form a loop with each other. In this way, the disposable diaper 1b of this embodiment is
Since the elastic members 21b and 21b 'of the waistline portion E are arranged so as to form a loop with each other, the fit property in the waistline portion can be further improved.

The disposable diapers 1c and 1d shown in FIGS. 6 and 7 are made of elastic side panels 20c and 20c, respectively.
20c ', 20d, 20d' are formed by non-stretchable portions 24c, 24d formed by a non-stretchable member and stretchable portions 25c, 25d formed by a stretchable member. Since it is adopted, it is possible to disperse the stress concentration at the leg.

Incidentally, in the embodiment shown in FIG.
Although the shape of the loop has been described as an example having a rectangular shape, the shape of the loop is not limited to this, and various shapes such as a circle and an ellipse can be used. Further, in any of the examples, the stretchable side panel is joined by sandwiching a stretchable member such as thermoplastic urethane or an olefinic foamed elastomer with a non-stretchable member such as a nonwoven fabric from above and below in the thickness direction. After that, it is also possible to use a stretchable side panel which is formed by slitting the non-stretchable member in the longitudinal direction of the diaper and which stretches in the lateral direction. Moreover, in the embodiment shown in FIGS. 1 and 2, the elastic member is arranged around the waist portion of the diaper, and the diaper in which the gathers which are substantially continuous are formed over the entire circumference of the diaper is illustrated. It is not necessary to dispose the elastic member in the waistline portion and the gathers may not be formed. Further, the present invention is not limited to the above-described embodiments, but can be variously modified without departing from the scope of the present invention.

[0036]

EFFECTS OF THE INVENTION The disposable diaper of the present invention improves the ease of peeling (tearing) the seal portion in a pants-type disposable diaper having an elastic side panel,
The usability is further improved.

[Brief description of drawings]

FIG. 1 shows a pants-type disposable diaper 1 according to the present invention.
It is a perspective view showing an example.

FIG. 2 is a partially cutaway exploded view of the disposable diaper shown in FIG.

FIG. 3 is a schematic diagram showing an outline of a method for measuring the bonding strength of a seal portion 31.

FIG. 4 is a development view (corresponding to FIG. 2) showing another embodiment of the pants-type disposable diaper of the present invention.

FIG. 5 is a development view (corresponding to FIG. 2) showing still another embodiment of the pants-type disposable diaper of the present invention.

FIG. 6 is a development view (corresponding to FIG. 2) showing still another embodiment of the pants-type disposable diaper of the present invention.

FIG. 7 is a development view (corresponding to FIG. 2) showing still another embodiment of the pants-type disposable diaper of the present invention.

[Explanation of symbols]

 1 Pants-type disposable diaper 11 Top sheet 12 Back sheet 13 Absorber 14 Front waist portion 14 'Rear waist portion 15 Waist opening 16 Leg part 17 Leg opening 20 Stretchable side panel 21 Waist elastic part 22 Leg part Elastic member 23 Waist elastic member 30 Waste tape 31 Seal part A Back part B Crotch C Ventral side D Waist opening vicinity E Girth part

Claims (7)

[Claims] 1. A disposable diaper comprising a main body including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the two sheets, wherein the main body is worn by a wearer when worn. It is divided into an abdominal part located on the ventral side, a dorsal part located on the back side, and a crotch part. Elastic side panels are provided on both left and right side edges of the abdominal part and the dorsal part. Are joined and fixed, the elastic side panel of the ventral side portion and the elastic side panel of the back side portion are joined and fixed, and a waist opening and a pair of left and right leg openings are formed, The stretchable side panel has a vertical strength of 3000 gf / 30 mm or more in a pants-type disposable diaper. 2. Both the side edges of the ventral side and the back side are made of a sheet containing at least one elastic side panel, and the joint strength of both side edges is 1000 gf.
It is / 30 mm or more, The disposable diaper of Claim 1 characterized by the above-mentioned. 3. The elastic member according to claim 1, wherein elastic members are disposed in the abdomen side portion and the back side portion in the vicinity of the waist opening and in the waistline portion located around the waistline of the wearer when worn. Pants-type disposable diaper. 4. The gather on the abdomen and the back is substantially continuous over the entire circumference of the diaper through the stretchable side panel. The pants-type disposable diaper described. 5. A plurality of the elastic members near the waist opening are arranged at a predetermined interval and substantially in parallel with an edge of the waist opening, and the elastic member of the waistline portion is 2. The pants-type disposable diaper according to claim 1, wherein at least some of them are arranged so as to form a loop with each other. 6. The elastic member in the vicinity of the waist opening and the elastic member in the waistline section have different contraction stresses, and the stress at the time of 50% extension has a relationship of waist opening> waistline section. The pants-type disposable diaper according to claim 1. 7. The pants-type disposable diaper according to claim 1, wherein the back side portion and the abdominal side portion of the waist opening have different stresses at 50% extension.