JP3222089B2 - 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 liquid-impermeable back sheet, and a flap part around a leg. Also, the present invention relates to a pants-type paper diaper in which both sides of a front body and a 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.

[0007] Therefore, a main object of the present invention is to provide a product which is suitable for continuous mass production, has a high effect of preventing leakage from around the legs, and particularly has an excellent appearance of the product.

[0008]

According to the present invention, there is provided an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a flap portion around a leg. A pants-type disposable diaper in which both sides of the front and back are fixed, and along one leg from one side of the front and along the other leg around the crotch of the product disposable diaper. A first elastic expansion / contraction member extending to the other side of the body, along one leg from one side of the back, and further around the other leg around the crotch of the product diaper; A second elastic expansion / contraction member reaching the other side of the crotch, wherein the first elastic expansion / contraction member and the second elastic expansion / contraction member are separated without intersecting at the crotch, and the second elastic expansion / contraction at the crotch. The distance between the first elastic member and the second elastic member is 3 cm. It is a pants-type disposable diapers, which is a bottom.

[0009]

In this type of disposable diaper, there is always a problem of lateral leakage from around the leg. However, in the disposable diaper according to the present invention, the absorbent body is provided between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the flap portion is provided around the leg. To provide a fixed pants-type disposable diaper, along one leg from one side of the front body, and then around the crotch of the product disposable diaper, along the other leg, and the other side of the front body And a first elastic member extending from one side of the back body, around one leg, and further around the crotch of the product paper diaper, around the other leg, and on the other side of the back body. And a second elastic expansion member.

Therefore, the elastic expansion and contraction member is provided on the leg portions of the front body and the back body, so that the effect of preventing lateral leakage around the legs is enhanced.

In this case, if the first and second elastic members are made to cross each other, the length of each elastic member becomes long, which is not economical. Even if it is necessary to perform the fixing step in two steps or it is possible to perform it in one step, when the elastic elastic member is extended to configure the leg circumference part, do not intersect when intersecting As compared with the case, the contraction force becomes large, control in the fixing step becomes difficult, and entanglement tends to occur at the intersection.

Furthermore, when the product is commercialized, the contraction force of the two elastic members acts intensively on the intersection, so that an excessive pressing force acts on the vicinity of the leg and the crotch near the intersection. . Moreover, the crotch portion extending to the other body side beyond the intersection and extending along the width direction is lifted to the abdomen and the back side by the contraction force of the elastic elastic member, so that the two crotch portions are easily loosened. Deteriorate the product appearance of the condition.

However, according to the present invention, the first elastic elastic member and the second elastic elastic member are separated from each other at the crotch part without intersecting, and the first elastic elastic member and the second elastic elastic member are separated from each other at the crotch part. When the separation distance from the elastic elastic member is 3 cm or less, the manufacturing process is simple and easy to control, and the fit to the wearer becomes good, and
The appearance of the product when worn is excellent.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the drawings. FIGS. 1 to 3 clearly show an example of a disposable diaper structure according to the present invention.

That is, between the liquid-permeable top sheet 1 made of non-woven fabric and facing the wearer's skin, the liquid-impermeable first back sheet 2 made of polyethylene and the like, and the second back sheet 6 made of non-woven fabric and the like. Flap portion F composed of the sheets 1 and 2 at least in the leg area
A semi-rigid absorber 3 mainly comprising cotton-like pulp except for L and provided with absorbent paper or the like as necessary is included therein, as shown in FIG.
A pants-type disposable diaper that is formed in advance in an hourglass shape, is folded in the front-rear direction, is fixed on both sides of a folded front body and a back body, and has no fastening tape.

In the present invention, the front body F extends along one leg from one side and further around the crotch portion of the product paper diaper (the lower portion of the product paper diaper), and extends along the other leg around the other leg. Has one or more first elastic expandable members 4 made of thread rubber or the like reaching the side of the rear body B, from one side of the back body B, along one leg, and furthermore, the crotch of the product paper diaper. One or more second threads made of thread rubber or the like that go around the other leg and reach the other side of the back body B
Elastic elastic member 5.

Each of the elastic members 4 and 5 is fixed to the flap portion FL so as to be substantially entirely expandable and contractable at the leg circumference, and substantially at the portion where the absorber 3 is located. Crotch portions 4A, 5A are fixed to the back sheet 2 in a substantially non-extended state to the extent that the absorber 3 is not deformed, and the elastic elastic members 4, 5 do not intersect at the lower portion, and the legs Around flap part F
In L, the elastic elastic members 4 and 5 form a continuous loop, that is, a continuous loop.

Further, in the embodiment, the leg portion of the first elastic expansion / contraction member 4 has a rear body B from the center in the longitudinal direction.
The second elastic expansion / contraction member 5 is shortened. The length l of the leg elastic portion of the first elastic member 4 extending in the back body direction from the center in the longitudinal direction is more preferably 2 cm or more. In the present invention, the separation distance g of the second elastic member 5 from the first elastic member 4 at the crotch is set to 3 cm or less. If it exceeds 3 cm, the first elastic elastic member 4 and the second elastic elastic member 5 tend to cause lateral leakage in the leg area.

FIG. 4 et seq. 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 by the supply means 16 at the middle of the back surface of the first back sheet 2 in the line width direction without substantially extending respectively. Is done. 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. The first elastic member 4 and the second elastic member 5 are fixed to the back surface of the first backsheet 2.

Subsequently, portions of the first and second elastic members 4 and 5 which are not substantially located on the absorber 3 are:
It is gripped by the gripping pulling means described later and is separated from the middle of the line.

In this tension state, the polymerization roll 18
A second backsheet 6 made of a nonwoven fabric or the like is superimposed on the first backsheet 2, and at least portions of the first and second elastic members 4, 5 which are not substantially located on the absorber 3 and a second The back seat 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 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 be 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
The second elastic elastic members 4, 5 are superimposed on the back surface of the first back sheet 2, and are preferably pressed by a pressing roll 22 disposed thereon, so that the absorber 3 on the back surface of the first back sheet 2 is located. Fixed in parts. afterwards,
Downstream, preferably, the previously fixed boundary portion is temporarily fixed, preferably by the temporary fixing roll 23. This temporary fixing roll
It is desired that the first back roll 2 can move forward and backward with respect to the back surface.

In this state, the gripping means 50, 50
Hooks 52, 52 extend to the first and second
After chucking the elastic elastic members 4 and 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 is applied to almost the front surface 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 back sheet 2 and the second back sheet 6 by the hot melt adhesive applied by the device 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. However, this aspect is not necessarily excluded in the present invention. When a single backsheet is used, it is desirable to use a so-called polylaminate nonwoven fabric and make the nonwoven fabric surface the outer surface.

In the case of such an embodiment, during manufacturing, for example, as shown in FIG. 10, the retracted temporary fixing roll 23 is pressed against the top sheet 1 and the first and second elastic members 4 and 5 are drawn. 8 is fixed to the top sheet 1 at a slightly right portion of the right end of the absorber 3, and is suppressed by the temporary fixing roll 23 in order to further prevent lateral displacement.
In this state, the sheet is pulled outward from the center of the line by the gripping means 50, 50, and a single back sheet 2A made of a non-woven fabric is laminated on the downstream side, and the first and second sheets are coated with the hot melt adhesive previously applied to the inner surface thereof. The two elastic members 4, 5 can be fixed, and the absorber 3 can be covered with the top sheet 1 and the back sheet 2A.

In each of the above facilities, 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.

As described above, according to the disposable diaper structure of the present invention, there are advantages that it is suitable for continuous mass production, has a high effect of preventing leakage from around the legs, and particularly has an excellent appearance of the product. Brought.

[Brief description of the drawings]

FIG. 1 is a development view of a main part of a disposable diaper according to the present invention.

FIG. 2 is a perspective view of a main part thereof.

FIG. 3 is a perspective view.

FIG. 4 is a front view of an example of the manufacturing apparatus.

FIG. 5 is a plan view thereof.

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

FIG. 7 is a plan view of another main part.

FIG. 8 is a plan view of another main part.

FIG. 9 is a side view of the gripping means.

FIG. 10 is a front view of another example of the manufacturing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... 1st back sheet, 2A ... Single back sheet, 3 ... Absorbent, 4 ... 1st elastic expansion-contraction member,
5 ... second elastic elastic member, 6 ... second back sheet, F ...
Front body, B ... Back body, FL ... Flap.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/49 A41B 13/04 A61F 5/44 A61F 13/15

Claims (2)

(57) [Claims] 1. A pants type having an absorber between a liquid-permeable top sheet and a liquid-impermeable back sheet, a flap portion around a leg, and fixed on both sides of a front body and a back body. A first elastic stretching from one side of the front body along one leg, and further around the crotch of the product paper diaper along the other leg to the other side of the front body. A second elastic member extending from one side of the back body, along one leg, and further around the crotch of the product diaper, along the other leg, and reaching the other side of the back body. The first elastic elastic member and the second elastic elastic member are separated from each other at the crotch part without intersecting, and the first elastic elastic member and the second elastic elastic member are separated at the crotch part. Pants type paper characterized in that the separation distance is 3 cm or less. One. 2. The pants-type disposable diaper according to claim 1, wherein the crotch of the first elastic expansion member extends in the back body direction from the longitudinal center of the product.