JP3222090B2 - Pants-type paper diapers - Google Patents

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, an absorbent body between a liquid-permeable top sheet and a back sheet, and a flap portion around a leg. And a pants-type disposable diaper to which both sides of the back body are fixed.

[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.

However, in recent years, so-called pants-type disposable diapers have been developed for the purpose of promoting diaper detachment, or for releasing the attaching work using the fastening tape from an adult each time to simplify 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 a pant without an absorber 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.

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. If the fixing portion is removed due to the contraction force of the elastic expansion and contraction member, it is difficult to obtain the desired product shape, and the sealing effect at the leg circumference may be impaired.

[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 improve the effect of preventing leakage from around the leg, and at the same time, to maintain the shape of the product and the appearance of the product when worn.

[0009]

According to a first aspect of the present invention, there is provided an absorbent member between a liquid-permeable top sheet and a back sheet, and a flap portion around a leg portion. Having, a pants-type paper diaper in which both sides of the front body and the back body are fixed, wherein the back sheet is
A first backsheet is provided on the absorber side, and a second backsheet is provided on a back surface side. The first backsheet and the second backsheet extend from an edge of the absorber, and extend portions thereof. Constitutes a flap portion where the absorber does not exist, and extends from the front body side of one leg around the lower part of the product disposable diaper to the first body that extends across the absorber continuous to the front body side of the other leg. A second elastic expansion and contraction member that traverses the absorber continuous from the back body side of one leg to the lower body side of the product paper diaper from the back body side of the other leg, The elastic member is interposed between the first back sheet and the second back sheet, and each elastic elastic member is stretchably fixed at least at a flap portion around the leg.

According to a second aspect of the present invention, there is provided the pants-type disposable diaper according to the first aspect, wherein the first and second elastic members do not intersect at the lower part, and are continuous by the elastic members at the flap around the leg. is there.

[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. As a result, a desired product shape can be reliably obtained. Thus, the good shape retention of the product results in an excellent appearance when the product is worn. In the present invention, the first backsheet and the second backsheet are extended from the edge of the absorber, and the extended portion constitutes a flap portion in which the absorber does not exist. In addition, since the fixed holding property of the elastic elastic member is stable, an excellent sealing effect can be exhibited.

A first elastic expandable member extending from the front body side of one leg around the lower part of the product disposable diaper and continuing across the absorber continuing to the front body side of the other leg; A second elastic elastic member that traverses the absorbent body from the body side to the lower part of the product paper diaper and continues to the rear body side of the other leg, and each elastic elastic member has at least a flap around the leg. Since it is extendably fixed, it has excellent sealing performance against urination around the legs and can reliably prevent leakage.

According to the second aspect of the present invention, since the first and second elastic members do not intersect at the lower part and are continuous by the elastic members at the flaps around the legs, the manufacturing equipment is reduced. Become simple.

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

[0016]

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. In this way, a pre-formed hourglass-shaped one is folded in the front-rear direction, and the folded both sides are fixed to constitute a pants-type paper diaper.

In one embodiment of the present invention, one or a plurality of thread rubbers or the like continuous from the front end F of one leg around the lower end of the product paper diaper to the front end F of the other leg around the other end. 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 the flap portion FL around the leg
, A continuous loop, that is, a continuous loop is formed by the elastic elastic members 1 and 2.

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. On both sides of the inner surface of the top sheet 1, elastic elastic members 11 for waist gathers are supplied while a hot melt adhesive is applied by a nozzle 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 elastic member 4 and the second elastic elastic member 5 are continuously supplied to the middle of the back surface of the first back sheet 2 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 non-woven 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 are simultaneously separated at the fixed portion into individual products. . After the heat sealing, it may be cut by a cutting device provided downstream.

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

That is, the gripping means 50, 50 have hooks 52 at the ends of the 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 this 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 fixing, the other portions of the second back sheet 6 are finally fixed by the full-width fixing roll 25 by the fixing roll 25.

On the other hand, in the above example, the use of both the first and second back sheets 2 and 6 instead of one back sheet provides an advantage that the elastic elastic member can be fixed easily and reliably. 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 facilities, the upside down 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.

[0034]

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. In addition, it is possible to obtain a material having a high effect of preventing leakage from around the leg, and having excellent shape retention and appearance when the product is worn.

[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 a main part thereof.

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)

(57) [Claims] An absorbent body is provided between a liquid-permeable top sheet and a back sheet, and a flap portion is provided around a leg.
A pants-type paper diaper in which both sides of a front body and a back body are fixed, wherein the back sheet has a first back sheet on the absorber side, and has a second back sheet on the back side thereof, The first backsheet and the second backsheet extend from an edge of the absorber, and the extended portion constitutes a flap portion in which the absorber does not exist, and a product paper diaper is formed from a front body side around one leg. A first elastic expandable member that traverses the absorber continuous with the front body side of the other leg around the lower part, and a product elastic diaper around the lower part of the product paper diaper from the rear body side of one leg; A second elastic elastic member that traverses the absorber continuous to the back body side, wherein each elastic elastic member is interposed between the first backsheet and the second backsheet; and each elastic elastic member is at least Flap around leg A pants-type disposable diaper characterized in that it is stretchably fixed at a part. 2. The pants-type disposable diaper according to claim 1, wherein the first and second elastic members do not intersect at a lower portion, and are continuous by each elastic member at a flap portion around a leg.