JPH1080444A - Pant-type paper diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the fixation holding property of elastic extention/ contraction materials by holding the respective elastic extention/contraction materials from the respective left ends of a front body and a back body to the right ends by way of a left thigh circumference, an inside leg and a right thigh circumference between first and second back sheets constituting the back sheet. SOLUTION: One or plural first elastic extention/contraction material 4 consisting of continuous string rubber, etc., from the front body F of one thigh circumference to the front body F end of the other thigh circumference through the lower part of a paper diaper is provided. In a same way, the second elastic extention/contraction material 5 is provided at a back body B side. The thigh circumference parts of the both elastic extention/contraction materials 4 and 5 are fixed to a flap part FL so as to be extention/contraction possible. Besides, a part positioned by an absorption body 3 is positioned between the first back sheet 2 and the second back sheet 6 and fixed to the back sheet 2. Thus, the deformation of the absorption body 3 is suppressed. The elastic extention/ contraction materials 4 and 5 are easily and surely fixed by the configuration.

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, specifically, a semi-rigid absorber between a liquid-permeable top sheet and a back sheet, and a flap portion around a leg. The present invention relates to a pants-type disposable diaper in which both sides of a front body and a back body are fixed and have no fastening tape.

[0002]

2. Description of the Related Art An absorbent body is enclosed between a liquid-permeable top sheet and a liquid-impermeable back sheet at least around a leg, leaving a flap portion composed of each sheet. A disposable diaper for wrapping a wearer is generally used by being fixed with a fastening tape fixed to a back body.

In recent years, so-called pants-type disposable diapers have been developed for the purpose of, for example, promoting diaper separation, or for releasing an attaching operation using a fastening tape from an adult each time, thereby simplifying the attaching operation. Is being done.

[0004] In addition, several proposals have been made for this pants-type paper diaper or pants for a long time. For example, U.S. Pat. No. 3,828,367 discloses a structure of pants without an absorbent body and a method of manufacturing the same.

[0005]

However, the pants disclosed in the above publication do not have an absorber, and thus do not function as a disposable diaper for infants or adults. In addition, when considering the addition of an absorber to this pants structure, the elastic elastic member is stretchable over the entire length, so the crotch portion shrinks when the absorber is deformed and supplied as a product. As a result, the appearance of the product becomes extremely poor, and the shape is not fixed. Therefore, when a plurality of products are stored in the packaging container, workability is poor.

On the other hand, according to the manufacturing method, a curved groove is formed in the nip roll along the circumference of the leg, and the nip roll is supplied while guiding the elastic elastic member.
When an actual manufacturing facility is considered, it is extremely difficult to control the system, and it cannot be applied to a mode in which an absorber is included.

On the other hand, it is possible to fix the elastic elastic member to a single back sheet, but it is suitable for mass production to use a hot-melt adhesive for this fixing. The fixed part is easily detached by force.
Once a part of the fixing part is detached, the contraction force propagates to other parts, and a situation where a predetermined contraction force is not exerted is caused.

[0008] Accordingly, a main object of the present invention is to make the elastic stretchable member particularly excellent in fixing and holding properties. Another object of the present invention is to provide a material which is suitable for continuous mass production, has a high effect of preventing leakage from around the leg, and has excellent shape retention.

[0009]

According to a first aspect of the present invention, there is provided a semi-rigid absorber between a liquid-permeable top sheet and a back sheet, and a flap around a leg portion. A pants-type disposable diaper having a front body and a back body, both sides of which are fixed and has no fastening tape, wherein the backsheet has a first backsheet on the absorber side, and A first elastic elastic member having a second back sheet on the side, and extending from the front body end of one leg to the lower part of the product paper diaper and continuing to the front body end of the other leg; A second elastic elastic member extending from the body end to a rear body end of the other leg around the lower part of the product paper diaper, wherein each elastic elastic member is located between the first back sheet and the second back sheet; Interposed, each elastic elastic member is at least a leg Is a pants-type disposable diaper, characterized in that Ri is substantially stretchable secured across the flap portion of the moiety.

[0010] According to a second aspect of the present invention, in the portion where the absorber is substantially located, the absorber is fixed to the back sheet in a substantially non-extended state to such an extent that the absorber is not deformed. 2. The pants-type disposable diaper according to claim 1, wherein the lower portion does not intersect, and the elastic waist is made continuous at each of the leg flap portions.

[0011]

In the disposable diaper according to the present invention, the elastic elastic member is fixed to the back sheet between the first back sheet and the second back sheet.

Therefore, even if a part of the fixed portion of the elastic elastic member is disengaged, the propagation of the contraction force of the elastic elastic member is restricted by the first back sheet, and thus the elasticity of the elastic member as a whole is reduced. The fixing of the elastic member becomes stable.

[0013] A first part extending from the front body end of one leg to the lower part of the product paper diaper and continuing to the front body end of the other leg.
An elastic elastic member, and a second elastic elastic member extending from a rear body end of one leg to a lower body end of the other leg around the lower part of the product paper diaper, and a leg around portion of each elastic elastic member Is substantially fixed at the flap portion so as to be able to expand and contract, and is continuous by the elastic elastic members at the leg-around flap portion, so that it is excellent in sealing performance against urination around the leg and leakage can be reliably prevented.

According to the second aspect of the present invention, in the portion where the substantially semi-rigid absorber is located, each elastic elastic member is backed in a substantially non-extended state to such an extent that the absorber is not deformed. Since it is fixed to the sheet, the semi-rigid absorber is not deformed, so that the shape of the entire disposable diaper is excellent, thereby enhancing the commercial value from the aspect of appearance and enhancing the packaging workability.

In addition, since the elastic members do not intersect at the crotch, the manufacturing equipment is simplified.

On the other hand, the operation relating to the manufacturing method and the apparatus will be described together with the following embodiment.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the drawings. FIG. 1 clearly shows an example of a disposable diaper structure according to the present invention.

That is, between the liquid-permeable top sheet 1 made of nonwoven fabric and facing the wearer's skin and the liquid-impermeable first backsheet 2 and liquid-permeable second backsheet 6 made of polyethylene or the like, A semi-rigid absorbent body 3 mainly composed of cotton-like pulp and provided with absorbent paper or the like as necessary, leaving a flap portion FL composed of the sheets 1, 2 and 6 at least around the leg, is included. Thus, a pants-type disposable diaper that is formed in advance in an hourglass shape, is folded in the front-rear direction, and the folded sides are fixed and has no fastening tape.

In one embodiment of the present invention, one or a plurality of thread rubbers or the like, which extend from the front end F around one leg to the lower end of the product paper diaper from the front end F around the other leg. One of the first elastic elastic member 4 and a thread rubber or the like continuous from the rear body B end of one leg to the lower body (inseam portion) of the product paper diaper and continuing to the rear body B end of the other leg. Or, a plurality of second elastically stretchable members 5 are provided, and substantially the entire leg portion of each of the elastically elastic members 1 and 2 is fixed to the flap portion FL so as to be able to expand and contract, and the absorber 3 is substantially positioned. The first backsheet 2 is substantially in a non-stretched state to such an extent that the absorber 3 is not deformed.
And the elastic elastic members 1 and 2 do not intersect at the lower part, and are continuous by the elastic elastic members 1 and 2 at the leg flap portion FL, that is, a loop is formed as if continuous. ing.

FIGS. 2 and 3 show a disposable diaper manufacturing facility, which will be described together with a more detailed disposable diaper structure example.

That is, a continuous liquid-permeable top sheet 1 wound in advance and a continuous liquid-impermeable first back sheet 2 made of polyethylene or the like are fed out and supplied to an assembly line. In the meantime, the absorber 3 having a length in the width direction of the line is intermittently supplied on the conveyor 10. Elastic elastic members 11 for waist gathers are supplied to both sides of the inner surface of the top sheet 1 while a hot melt adhesive is applied by nozzles 12, and the first back sheet 2 is supplied by nip rolls 13 and 14.
Is fixed by polymerization. Further, a nip roll 13 is provided on the inner surface of the first backsheet 2 (with respect to the absorber).
Before being supplied between the nip rolls 14, the hot melt adhesive is applied by the coating device 15, so that the nip rolls 13 and 14 are polymerized with the top sheet 1 and the absorber 3 is fixed.

Thereafter, the first elastic expansion member 4 and the second elastic expansion member 5 are continuously supplied to the back surface of the first back sheet 2 at the middle in the line width direction without substantially extending, respectively, by the supply means 16. . Before the supply, the hot melt adhesive is intermittently applied by the nozzle 17.

Next, since the hot melt adhesive is previously intermittently applied to portions of the supplied first and second elastic members 4 and 5 which are substantially located on the absorber 3, First elastic expansion member 4 and second elastic expansion member 5
Is fixed to the back surface of the first back sheet 2.

Subsequently, the first and second elastic elastic members 4,
The portion of the wire 5 not substantially located on the absorber 3 is grasped by a grasping and pulling means described later, and is separated from the middle of the line.

In this tension state, the polymerization roll 18
A second back sheet 6 made of a nonwoven fabric or the like is superimposed on the first back sheet 2, and at least portions of the first and second elastic elastic members 4, 5 which are not substantially located on the absorber 3 and a second back sheet. The sheet is fixed.

Thereafter, the roll cutter device 19
A portion between the first elastic member 4 and the second elastic member 5 and not substantially located on the absorber 3 is hollowed out.

Subsequently, one side of the above-described continuous element is folded back to the other side at the middle of the line by the sailor means 20.

Next, the top sheet 1 and the first back sheet 2 are fixed by the heat-sealing and cutting device 21 at the portion where the absorber 3 is not present, and at the same time, are divided at the fixed portion to form individual products. . After the heat sealing, it may be cut by a cutting device provided downstream.

In the above example, the fixing of the elastic elastic members 4 and 5 can be performed, for example, by gripping means shown in FIGS.

That is, the gripping means 50, 50 have hooks 52 at the respective ends of cylinders 51, 51 provided orthogonally on both sides of the line.

When the gripping means 50 is provided, the first
And the second elastic expansion members 4 and 5 are connected to the first backsheet 2.
The first back sheet 2 is fixed at a position where the absorber 3 is located on the back surface of the first back sheet 2 by being pressed by a holding roll 22 which is preferably disposed. Thereafter, the fixing boundary portion is temporarily fixed, preferably by a temporary fixing roll 23, to the downstream. It is desired that the temporary fixing roll can freely advance and retreat with respect to the back surface of the first back roll 2.

In such a state, the gripping means 50, 50
Hooks 52, 52 extend to the first and second
After chucking the elastic members 4, 5, the chucking is released at the extension limit. At this time, when the second back sheet 6 is overlapped with the polymerization roll 18 having a length slightly shorter than the separation width of the first and second elastic expansion members 4 and 5, the coating device is disposed almost in front of the inner surface of the second back sheet 6. The first and second elastic elastic members 4 and 5 are fixed to the first backsheet 2 and the second backsheet 6 by the hot melt adhesive applied by 24.

After the fixation, the other portions of the second backsheet 6 are finally fixed by the full-width fixation roll 25 by the fixing roll 25.

On the other hand, in the above example, the use of both the first and second backsheets 2 and 6 instead of one backsheet provides an advantage that the elastic elastic member can be easily and reliably fixed. By using a nonwoven fabric as the second backsheet 6, the appearance of the product is improved. Conversely, when the back sheet is made of a single plastic sheet such as polyethylene, the appearance is poor and the commercial value is low.

In the above equipment, the upper and lower sides may be reversed. Further, an elastic elastic member may be fixed to the top sheet 1 side. When the amount of extension of the elastic elastic member is small, it is possible to fix the elastic member to the absorber 3 so as to counter the tension.

[0036]

As described above, according to the disposable diaper structure of the present invention, the elastic elastic member is particularly excellent in the fixing and holding properties. Still, it is suitable for continuous mass production, has a high effect of preventing leakage from around the leg, and has excellent shape retention.

[Brief description of the drawings]

FIG. 1A is a development view of a main part of the disposable diaper of the present invention,
(B) It is a principal part perspective view.

FIG. 2 is a front view of an example of a manufacturing apparatus.

FIG. 3 is a plan view thereof.

FIG. 4 is a plan view of another main part.

FIG. 5 is a plan view of another main part.

FIG. 6 is a plan view of the main part.

FIG. 7 is a side view of the gripping means.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... 1st back sheet, 2A ... Single back sheet, 3 ... Absorbent, 4 ... 1st elastic expansion member, 5
... Second elastic member, 6. Second backsheet.

Claims (2)

[Claims] A semi-rigid absorber is provided between a liquid-permeable top sheet and a back sheet, and a flap portion is provided around a leg. A fastening tape is fixed on both sides of a front body and a back body. A pants-type disposable diaper that does not have a backsheet, wherein the backsheet has a first backsheet on the absorber side and a second backsheet on the back side, and a product from the front body end around one leg A first elastic elastic member which is continuous with the front body end of the other leg around the lower part of the disposable diaper, and is continuous with the rear body end of the other leg around the lower part of the product disposable diaper from the rear end of the one leg part; Each elastic elastic member is interposed between the first backsheet and the second backsheet, and each elastic elastic member covers at least substantially the entire flap portion around the leg. Make sure that it is A pants-type paper diaper characterized by the following. 2. In a portion where the absorber is substantially located, the absorber is fixed to the backsheet in a substantially non-extended state to such an extent that the absorber is not deformed, and each elastic elastic member does not intersect at the lower part. The pants-type disposable diaper according to claim 1, wherein the elastic flaps at the leg flap portion are continuous.