JP3599722B2 - Disposable diaper manufacturing method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for manufacturing a disposable diaper, and more specifically, a disposable diaper including an outer layer sheet for defining the outer shape of a diaper and an absorbent body, wherein both sides of the front body and both sides of the back body are fixed while leaving a leg circumference portion. It relates to a manufacturing method.
[0002]
[Prior art]
As shown in FIG. 5, a conventional pants-type disposable diaper 100 includes a semi-rigid absorber 101 on the inner surface side of an outer layer sheet 102A that defines the outer shape of the diaper. The width of the outer layer sheet 102A defining the outer shape of the diaper was wider than the absorber 101 in the crotch portion Y1.
[0003]
Further, in the conventional method for manufacturing a disposable diaper, as shown in FIG. 6, in a process after the absorber 101 is laminated on the continuous body 102 of the outer layer sheet defining the outer shape of the diaper, the absorption between the absorbers 101, 101 is performed. Leg portions 103 are cut at portions not located on the body 101.
[0004]
[Problems to be solved by the invention]
However, such a conventional disposable diaper has a wide crotch width, and a hole through which the leg passes is opened toward the side of the diaper, so that when the diaper is worn or peeled, the thigh is easily caught by the leg circumference, It was difficult to pass through.
[0005]
This problem is mainly caused by the conventional manufacturing method described above. That is, in the conventional method, in the step after laminating the absorbent body or the step after laminating the laminated body including the absorbent body, the leg portion of the continuous body of the outer layer sheet defining the outer shape of the diaper is cut in the outer layer sheet. Inevitably, the cuttable portion is necessarily limited to a portion between the absorbers that is not located on the absorber. As a result, in the conventional method, the cut size and cut shape of the leg circumference are limited, and the width of the outer layer sheet cannot be made narrower than that of the absorber, especially in the crotch portion. In the conventional manufacturing method, it is not impossible to reduce the width of the outer layer sheet in the crotch portion by laminating the absorber having a narrow crotch portion, but this reduces the absorption capacity of the crotch portion. Not preferred.
[0006]
Therefore, a main object of the present invention is to propose a method of manufacturing a disposable diaper that can freely determine a cut size and a cut shape of a leg-surrounding portion and can thereby manufacture a disposable diaper through which a leg can be easily passed.
[0007]
[Means for Solving the Problems]
A disposable diaper of the present invention that has solved the above-mentioned problems, in a method for producing a disposable diaper having an outer layer sheet and an absorber that define the outer shape of the diaper,
For the outer layer sheet that defines the outer shape of the diaper, at the boundary between the preceding individualized product and the succeeding individualized product, the outer sheet is cut out to form the leg circumference of each product, and then the absorption is performed. A laminate including a body or the absorber is laminated, and the outer layer sheet is divided at the boundary portion.
[0008]
Further, in a method for manufacturing a disposable diaper having an outer layer sheet and an absorber defining a diaper outer shape,
For the outer layer sheet that defines the outer shape of the diaper, the width of the crotch portion of the outer sheet is less than or equal to the width of the absorber in the boundary between the preceding individualized product and the succeeding individualized product. Forming a leg around portion of each product by hollowing out the product, laminating the absorber or a laminate including the absorber, and dividing the outer layer sheet at the boundary portion; A method is also proposed.
[0009]
A disposable diaper having a back sheet, an absorbent body and a top sheet on the side of the outer layer sheet used, and a disposable diaper mainly composed of cotton-like pulp wrapped with absorbent paper can be obtained.
[0010]
<Action>
In the disposable diaper according to the embodiment of the present invention, at least at the crotch portion, the width of the outer layer sheet defining the outer shape of the diaper is equal to or less than the width of the absorber. Therefore, the disposable diaper according to the embodiment of the present invention can pass through the leg more easily than the conventional one. Further, in the disposable diaper of the present invention having the elastic elastic portion on the outer side of the absorber, the elastic elastic portion fits on the thigh and the root portion, so that the crotch leakage hardly occurs. In this disposable diaper, the elastic stretchable portion is located outside the side portion of the absorber, but expands and contracts, so that ease of legging is not impaired.
[0011]
Further, in the method for manufacturing a disposable diaper of the present invention, the outer layer sheet defining the outer shape of the diaper is cut out to form a leg circumference portion, and then the absorber or the laminate including the absorber is laminated. The part that can be cut (cut) is not limited to the part that is not located on the absorber between the absorbers. Therefore, in the method for manufacturing a disposable diaper of the present invention, the cut size and cut shape of the leg circumference can be freely determined, and for example, as in the disposable diaper in the above-described embodiment of the present invention, at least the outer layer sheet with respect to the crotch portion. Having a width of not more than the width of the absorber can also be manufactured.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0013]
FIG. 1 shows a disposable diaper example 1 according to an embodiment of the present invention, FIG. 2 shows a deployed state viewed from the top sheet side, and FIG. 3 shows a longitudinal section of the crotch portion Y2. That is, the disposable diaper 1 of the present example is provided with an outer layer sheet 7 that defines the outer shape of the diaper and the semi-rigid absorber 4, and is fastened to both sides of the front body and both sides of the back body, leaving the leg circumference 7a. The width of the outer layer sheet 7 is at least the width of the absorber 4 with respect to at least the crotch portion Y2.
[0014]
More specifically, as shown in FIG. 2, the outer sheet 7 defining the outer shape of the diaper has four front corner flaps FF1 and FF2 and a rear body flap FB1 at four corners by cutting (cutting) the leg circumference 7a. , FB2 are formed. Then, as shown in FIG. 1, the front body and the back body are overlapped so that the side ends of the front body flap portions FF1 and FF2 and the corresponding side ends of the back body flap portions FB1 and FB2 are It is fixed with hot melt adhesive or heat seal. As shown in FIG. 3, the outer layer sheet 7 has a double structure composed of two flexible sheets 7D and 7E (example: nonwoven fabric), and has a sheet 7D and a sheet 7D in a leg circumference portion 7a and a waist circumference portion 7b. Between 7E, an appropriate number of elastic elastic members G1 and G1 for fastening around the waist and around the legs are provided. Further, although not shown, the outer layer sheet 7 can also be formed by integrating a waist portion and a crotch portion (portion forming a leg portion).
[0015]
Further, in the disposable diaper 1 of the present example, an absorber housing portion 5 extending in the front-rear direction between the crotch portions Y2 is provided on the inner surface side of the outer layer sheet 7, and the absorber 4 is provided in the absorber housing portion 5. It is included. As shown in FIG. 3, the absorber housing portion 5 includes a liquid-permeable top sheet 2 made of a nonwoven fabric or the like and directly touching the wearer's skin, and a liquid-impermeable back sheet 3 made of polyethylene or the like. In between, an absorbent body 4 mainly composed of cotton-like pulp and optionally wrapped with absorbent paper (not shown) is included. The top sheet 2 and the back sheet 3 are bonded to each other at a peripheral portion thereof by, for example, a hot melt adhesive. It is desirable to provide an appropriate number of elastic elastic members G2 and G2 between the top sheet 2 and the back sheet 3 along the longitudinal direction of the edge portions of the adhesive edge portions on both sides. As a result, the side edges 5a, 5a of the absorber housing portion 5 located on the outer side of the absorber 4 in the crotch portion Y2 function as elastic expansion and contraction portions, and fit well to the base of the thigh, thereby preventing crotch leakage. Can be Also, the width of the absorber 4 is preferably about 9 cm as in the conventional case.
[0016]
Further, in the disposable diaper 1 of the present example, a hydrophobic and air-permeable barrier sheet 6 made of a stretchable nonwoven fabric or the like is provided so as to wrap the absorber housing section 5. Each of the both sides of the barrier sheet 6 is folded back in an M-shape, and elastic elastic members G3, G3... Such as thread rubber are sandwiched in folded portions 6A, 6A. The opposing inner surfaces of the portions 6A, 6A,... Are adhesively fixed. Thus, the folded back portions 6A of the barrier sheet 6 function as elastic elastic portions that tighten around the legs outside the side edges of the absorber 4. The barrier sheet 6 is fixed to the periphery of the top sheet 2 and the back sheet 3 by, for example, a hot melt adhesive or a heat seal. The barrier sheet 6 is fastened to the outer layer sheet so that the fastening portion becomes linear (from the front body to the back body) on the surface of the outside of the back sheet 3 opposite to the side surface of the back sheet 3. You.
[0017]
By the way, the disposable diaper of this example cannot be produced by the conventional production method as described above, but can be produced by the following production method of the disposable diaper according to the present invention.
That is, as shown in FIG. 4, a continuous outer layer sheet 70 that has been wound up in advance is fed out, and a leg cutter portion is set by a roll cutter device or the like (not shown) such that the width of the crotch portion is equal to or less than the width of the absorber 4. Cut (cut out) 7a.
[0018]
Thereafter, on the upper surface of the outer layer sheet 70 (the surface that becomes the inner surface of the diaper), the absorber housing portion 5 is disposed so as to extend in the front-rear direction with the crotch portion as the center. Although not shown, the absorber housing portion 5 is provided by, for example, laminating a liquid-impermeable back sheet 3, an absorber 4, and a liquid-permeable top sheet 2 in a predetermined position on the outer layer sheet 70 in this order. At this time, the outer layer sheet 70 and the peripheral edge of the liquid-impermeable back sheet 3 are bonded, and the peripheral edge of the back sheet 3 and the peripheral edge of the top sheet 2 are bonded.
In the case where the elastic elastic members G2 and G2 are arranged between the top sheet 2 and the back sheet 3, the top sheet 2 is laminated after the elastic elastic members G2 and G2 are arranged on the periphery of the back sheet 3 and, at that time, Glue the periphery. When the barrier sheet 6 is provided, the back sheet 3, the absorber 4, and the top sheet 2 are laminated on the barrier sheet 6 in this order. And the periphery of the liquid-permeable top sheet 2.
The bonding is performed by a hot melt adhesive or a heat seal.
[0019]
Although the subsequent steps are not shown, they are not different from the conventional manufacturing method. That is, when the disposition of the absorbent container 5 is completed, one side end of the outer layer sheet 70 is subsequently folded back to the other side. At that time or thereafter, the front body flap portion FF1 and the rear outer sheet portion 7 ″ (the following portion) in the portion 7 ′ (the portion forming the outer layer sheet of the preceding individualized product) that forms the front outer layer sheet in the outer layer sheet 70. (The part forming the outer layer sheet of the individualized product to be formed), the boundary portion L with the front body flap portion FF2 (refer to FIG. 4 for the above symbols) is fastened with a hot melt adhesive or a heat seal or the like, and simultaneously stopped. It is divided into individual products at the wearing part. The outer layer sheet 70 can be cut after being fixed with a hot melt adhesive or a heat seal.
[0020]
In this example of the manufacturing method, as described above, the outer layer sheet 7 has a double structure composed of two flexible sheets 7D and 7E, and is provided between the sheets 7D and 7E in the leg circumference portion 7a and the waist circumference portion 7b. In the case where an appropriate number of elastic elastic members G1 and G1 for tightening the waist and the leg are provided, although not shown, two flexible sheets 7D and 7E are overlapped and adhered. By disposing the elastic members G1 and G1 at predetermined positions therebetween, an integral outer layer sheet 7 is formed, and the outer sheet 7 can be cut around the legs. The steps after the cutting around the leg can be performed in the same manner as the above-described method. Although not shown, one of the flexible sheets 7D constituting the inner surface side of the outer layer sheet 7 is cut around the leg, and then the flexible sheet 7D is placed before or after the absorber housing section 5 is provided. After being provided, the leg around the leg is cut in advance on the other side of the flexible sheet 7D opposite to the side on which the absorbent container 5 is provided, and the other flexible sheet constituting the outer surface side of the outer layer sheet 7 is formed. The sheet 7E can be overlapped and bonded so that the leg portions of the flexible sheets 7D and 7E overlap. The bonding between the flexible sheets 7D and 7E in these methods can be performed using a hot melt adhesive or a heat seal.
[0021]
Further, in the above-described example of the manufacturing method, the top sheet 2, the absorber 4, and the back sheet 3 constituting the absorber housing portion 5 are sequentially laminated and fixed on a continuous outer layer sheet. It is not limited to. For example, the top sheet 2, the absorber 4, and the back sheet 3 that constitute the absorber housing section 5 are stacked in advance and integrated to form a laminated body of the absorber housing section 5 (when the barrier sheet 6 is provided, this is also integrated). Can be formed, and the laminate can be laminated and fixed on a continuous outer layer sheet.
[0022]
【The invention's effect】
As described above, according to the method for manufacturing a disposable diaper of the present invention, the leg circumference that can be cut out (cut) is not limited to a portion that is not located on the absorber between the absorbers. The shape can be freely determined, so that it becomes possible to manufacture a disposable diaper in which the width of the crotch is wider than the width of the absorber and the leg can easily pass through.
[Brief description of the drawings]
FIG. 1 is a perspective view of a main part showing a disposable diaper according to the present invention.
FIG. 2 is a development view of the main part.
FIG. 3 is a longitudinal sectional view of a crotch part.
FIG. 4 is an explanatory view showing a method for manufacturing a disposable diaper according to the present invention.
FIG. 5 is a perspective view showing a conventional paper diaper.
FIG. 6 is an explanatory view showing a conventional method of manufacturing a disposable diaper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 2 ... Liquid-permeable topsheet, 3 ... Liquid-impermeable backsheet, 4 ... Absorber, 5 ... Absorber accommodation part, 6 ... Barrier sheet, 7 ... Outer layer sheet, G1, G2, G3 ... Elasticity Elastic member, 70: continuous outer layer sheet, FF1, FF2: front body flap portion, FB1, FB2: rear body flap portion.

Claims (4)

In a method for manufacturing a disposable diaper having an outer layer sheet and an absorber defining a diaper outer shape,
For the outer layer sheet that defines the outer shape of the diaper, at the boundary between the preceding individualized product and the succeeding individualized product, the outer sheet is cut out to form the leg circumference of each product, and then the absorption is performed. A method for manufacturing a disposable diaper, comprising: laminating a body or a laminate including the absorber and dividing the outer layer sheet at the boundary. In a method for manufacturing a disposable diaper having an outer layer sheet and an absorber defining a diaper outer shape,
For the outer layer sheet that defines the outer shape of the diaper, the width of the crotch portion of the outer sheet is less than or equal to the width of the absorber in the boundary between the preceding individualized product and the succeeding individualized product. Forming a leg around portion of each product by hollowing out the product, laminating the absorber or a laminate including the absorber, and dividing the outer layer sheet at the boundary portion; Method. The method for producing a disposable diaper according to claim 1, wherein the diaper has a back sheet, an absorber, and a top sheet on the side of use of the outer layer sheet. The method for producing a disposable diaper according to claim 1, wherein the absorbent is mainly made of cotton-like pulp and wrapped with absorbent paper.

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