JPH0451180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing sanitary napkins and an apparatus thereof, and more particularly, to a method for producing sanitary napkins, and more particularly, to The present invention relates to a method and apparatus for manufacturing a sanitary napkin in which a sheet is interposed to prevent backflow.

(Prior Art) Conventionally, in sanitary napkins, attempts have been made to prevent the body fluids absorbed into the absorbent material from flowing back, for example, Japanese Utility Model Publication No. 18798/1983 and Japanese Patent Application Laid-open No. 85661/1983. As disclosed in publications and the like, there is one in which a waterproof sheet is disposed on the upper surface of an absorbent body, and body fluids are absorbed through openings formed in the waterproof sheet. this house,
For example, the sanitary napkin proposed in Japanese Patent Application Laid-Open No. 59-85661 has a backflow absorbing opening 1a formed in advance at the absorption position when worn, as shown in FIGS. 7 and 8. The waterproof sheet 1 for prevention is arranged so as to cover the top surface of the absorbent body 2, and the waterproof back sheet 3 is placed from the back side of the absorbent body 2 to the absorbent body 2 whose top surface is covered with the waterproof sheet 1 in this way. Wrap around the upper surface to cover it, and then cover the whole with a water-permeable sheet 4.
The water-permeable sheet 4 and the waterproof sheets 1 and 3 are integrally joined 5 at both ends in the longitudinal direction.

Such a sanitary napkin is manufactured by, for example, an apparatus as shown in FIGS. 9 and 10. That is, the long backflow prevention waterproof sheet 1 discharged from the roll 10 is fed in advance between the receiving roll 11 and the roll cutter 12, where the absorption openings 1a are punched out at predetermined positions in the waterproof sheet 1 by the blade 12a. It will be done. The punching waste is sucked up by the suction device 13 and disposed of.

The absorbent body 2 is intermittently supplied to the waterproof sheet 1 in which the opening 1a is formed in advance in this manner, and the waterproof sheet 1 is rolled up by the winding machine 14 so as to cover one side of the absorbent body 2. Next, the long waterproof back sheet 3 discharged from the roll 30 is supplied to the other side of the absorbent body 2 and passed through the winding machine 1.
5, the absorbent body 2 is rolled up from the other side.
A long water-permeable sheet 4 discharged from the roll 40 is further supplied to this covering body,
The winder 16 wraps it onto the covering body. After this, the covering body is further fed on the line, and at the cut-off position of the absorbent body 2, the water-permeable sheet 4 and the waterproof sheets 1 and 3 are removed.
are integrally joined and cut to produce a sanitary napkin as shown in FIGS. 7 and 8.

(Problems to be Solved by the Invention) However, the method for manufacturing sanitary napkins as described above has the following problems.

(1) The water-impermeable sheet for preventing backflow needs to have a size substantially equal to the surface area of the sanitary napkin on the usage side, and is expensive in terms of materials.

(2) Punching scraps are generated when punching absorption openings in the water-impermeable sheet for backflow prevention, and it is necessary to dispose of the punching scraps, so a punching scrap absorber,
A crushing device, etc. must be provided, which is costly in terms of equipment.

(3) When forming openings in a water-impermeable sheet for backflow prevention, incomplete cutting may result in a product with incomplete openings. Furthermore, even if the napkin is completely cut, there is a risk that the punching scraps will remain inside the napkin and be turned into a product due to incomplete suction of the punching scraps.

(4) Since punching of the opening is an intermittent operation, intermittent impact loads are applied to the cutter, which tends to cause wear and tear on the cutter.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for manufacturing a sanitary napkin and an apparatus therefor that can solve the problems of the prior art described above.

(Means for Solving the Problems) In order to solve the above problems, the first invention includes a long water-permeable sheet and a long first water-impermeable sheet that are fed along a line flow. In the method of manufacturing a sanitary napkin, the water-permeable sheet and the first water-impermeable sheet are intermittently supplied during the manufacturing process, and both sheets are integrally joined and cut at a cut-off position of the absorber. (a) Separately, the second water-impermeable sheet is subjected to continuous and repeated unevenness centered on the center line in the width direction of the second water-impermeable sheet along its feeding direction. cutting into a pattern to form two separate long sheets; (b) passing at least one of the two separated water-impermeable long sheets through a detour to connect the two sheets together; (c) Then, the two separated sheets are rearranged so that their concave portions and convex portions face each other, and (d) The two sheets thus placed are intermittent. The absorbent body is polymerized so that the concave portion is located approximately in the center of the absorbent body, and
It is characterized by leaving an absorption opening in the central part of the absorbent body.

In addition, the second invention provides a long water-impermeable sheet,
A cutter roll that cuts into a continuous and repetitive pattern with irregularities centered on the width direction center line and divides the sheet into two in the width direction; A tapered roll, a second tapered roll that tensions the water-impermeable sheet piece guided to the detour, and a roll that aligns the at least one water-impermeable sheet piece on the same plane as the other water-impermeable sheet piece. A sanitary napkin manufacturing device comprising:

(Function) According to the present invention, the water-impermeable sheet for backflow waterproofing interposed between the absorbent body and the water-permeable surface sheet is arranged so that the long water-impermeable sheet is spread across the width along the feeding direction. When cutting into two halves by cutting into a continuous and repeated pattern with concave and convex irregularities from the center line of the direction, at least one of them is detoured and then combined with the other, the convex parts and the concave parts of the two halves of the sheet form an absorbent body. The absorbent body is arranged so as to be line symmetrical with respect to the center line in the width direction of the surface, and the opening formed by the concave portions is located at a predetermined position of the absorbent body.
The width of the material sheet can be made narrower compared to conventional ones. Further, since no punching waste is generated when forming the opening, there is no need to provide processing equipment. Furthermore, it is possible to prevent the occurrence of defective products such as mistakes in opening formation or mixing of punching scraps. Furthermore, since the cutting operation is continuous, it is possible to prevent wear of the cutter, spillage of the blade, etc.

(Example) FIG. 1 is a schematic diagram showing an example of the method and apparatus for manufacturing a sanitary napkin according to the present invention.

A long backflow prevention water impermeable sheet 1 is a roll 1
It is fed out from zero and is supplied between the roll cutter 12 and the receiving roll 11 via a turning roll. The surface of the roll cutter 12 is provided with a blade 12a near the center in the width direction that forms a continuous and repeated pattern, for example a sine wave, extending along the circumference of the roll from the center in the width direction. The flexible sheet 1 is divided into two sheet pieces 1A and 1B along the above pattern. The shape of the pattern is not limited to a sine wave, and may be a continuous U-shaped pattern or an inverted U-shaped pattern, a triangular wave pattern, etc., but a shape that is point symmetrical at the turning point of the unevenness is preferable.

One of the two divided water-impermeable sheet pieces (1A in the illustrated example) is guided by a tapered roll 17, enters a detour, is supplied to a roll 19 via a tensioned tapered roll 18, and is fed by another route. It is again aligned on the same plane as the other water-impermeable sheet piece 1B. The detour X formed from the tapered roll 17 to the roll 19 is
=L+l/2N (where l is the repetition length of the cutting pattern and N is an odd number). Thereby, at the position of the roll 19, the convex portions and the concave portions of the two water-impermeable sheet pieces 1A, 1B are arranged symmetrically with respect to the width direction center line. Prior to this rearrangement on the roll 19, each sheet piece 1A, 1
Hot melt may be applied to B using hot melt applicators 20 and 21 to adhere it to a water permeable sheet 4 to be described later. The reason why the rolls 17 and 18 are tapered is to prevent the water-impermeable sheet piece 1A from meandering during feeding.

The water-impermeable sheet pieces 1A, 1B rearranged by the roll 19 are supplied to the turning roll 22 together with the water-permeable sheet 4 discharged from the roll 40, and are fed along the line. Absorbent bodies 2 are intermittently supplied to such sheets 1A, 1B, 4 by a belt conveyor 23, and placed on the sheets on turning rolls 22,
It is fed on the line. Next, the water-impermeable sheet 3 unrolled from the roll 30 is supplied from above the absorbent body 2 and covers the absorbent body 2 from the back side to the top side. As a result, a structure was obtained in which the water-permeable sheet 4, the water-impermeable backflow prevention sheet 1, the absorbent body 2, and the water-impermeable sheet 3 were laminated in this order from the upper surface, and this laminate was further layered by a known method to absorb water. They are joined and cut at different positions on the body to produce product napkins.

4 to 6 show an example of a sanitary napkin manufactured according to the present invention.

In this example, backflow prevention water-impermeable sheet pieces 1A and 1B are arranged on the upper surface of the absorbent body 2 so that their convex portions and concave portions face each other, and the concave portions are placed at a predetermined position in the center of the absorbent body. The absorption opening 1a to be formed remains. Impermeable sheet piece 1
Further on the upper surfaces of A and 1B, a water permeable surface sheet 4 is provided.
On the other hand, a water-impermeable back sheet 3 is rolled up from the back side of the absorbent body 2, around the sides, and further to both sides of the water-permeable top sheet. As shown in FIG. 5, the back sheet 3 and top sheet 4 can be brought into close contact with each other by heat sealing or the like at a position slightly inside the side edge of the back sheet. In this case, leakage of body fluids can be effectively prevented. As shown in FIG. 6, the back sheet 3, the water-impermeable sheets 1A and 1B, and the water-permeable sheet 4 are integrally joined to both longitudinal ends of the napkin. Alternatively, a thin hot melt film may be interposed between the water-impermeable sheets 1A, 1B and the water-permeable sheet 4 to join the two sheets together. In this case, bodily fluids can be prevented from spreading along the surface of the water-permeable sheet 4 and causing front-to-back and side-to-side leakage.

Examples of the material of the water-impermeable sheet 3 include:
A nonwoven fabric sheet coated with polyethylene on the inner surface is used.

The water-permeable sheet 4 is preferably a non-woven fabric sheet mainly made of hydrophobic fibers, and the water-impermeable sheets 1A, 1B are preferably thin sheets of polyethylene.

The absorption opening 1a formed by the water-impermeable sheets 1A and 1B has a shape surrounded by a sine curve, a triangle, or a rectangle, and covers 1/4 to 1 of the surface of the absorbent body 2. It has a size of /2.

(Effects of the Invention) According to the present invention, as described above, since the opening of the water-impermeable sheet for preventing backflow is performed in a continuous operation, the flow of the process is smooth and damage to the apparatus is small. In addition, no punching waste is generated when cutting the opening, making it economical. Furthermore, there is an advantage that processing equipment such as a punching waste removal device and a crushing device can be omitted.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a sanitary napkin manufacturing apparatus according to the present invention, and FIG.
A line arrow view; FIG. 3 is a perspective view of the device shown in FIG. 2;
FIG. 4 is a perspective view of a sanitary napkin manufactured according to the present invention, FIG. 5 is a sectional view taken along the line - - in FIG. A perspective view of a sanitary napkin, Figure 8 is the same as Figure 7.
A line sectional view, FIG. 9 is a schematic diagram showing a conventional sanitary napkin manufacturing apparatus, and FIG. 10 is a cross-sectional view of FIG.
It is a line arrow view. 1... Water-impermeable sheet for backflow prevention, 1a... Opening,
1A, 1B...Water-impermeable sheet piece, 2...Absorber, 3
...Water-impermeable back sheet, 4...Water-permeable sheet, 10
... Impermeable sheet roll for backflow prevention, 12... Roll cutter, 12a... Blade, 13... Suction device, 14,
15, 16... Winding machine, 17, 18... Taper roll, 19... Roll, 20, 21... Hot melt applicator, 22... Turning roll, 23... Belt conveyor, 30... Water impermeable back sheet roll, 40... Water permeable sheet roll.

Claims (1)

[Claims] 1. An absorbent body is intermittently supplied between a long water-permeable sheet and a long first water-impermeable sheet that are fed along a line flow, and In a method for manufacturing a sanitary napkin by integrally joining and cutting both sheets, prior to supplying an absorbent material between the water-permeable sheet and the first water-impermeable sheet, (a) separately, Cutting the second water-impermeable sheet along the feeding direction into a continuous and repetitive pattern having concavities and convexities centered on the center line in the width direction of the sheet to form two separate elongated sheets; (b) passing at least one of the two separated water-impermeable long sheets through a detour to separate the two sheets from each other; (c) then separating the two separated sheets from each other; , rearrange the two sheets so that their concave portions and convex portions face each other, and (d) place the two sheets arranged in this manner against an intermittently supplied absorbent body, so that the concave portions of the sheets face each other. Polymerize so that it is located almost in the center,
A method for producing a sanitary napkin, characterized in that an absorbent opening is left in the center of the absorbent body. 2. A cutter roll that cuts a long water-impermeable sheet into a continuous and repetitive pattern with irregularities centered on its widthwise center line and divides it into two in the width direction, and at least one of the two divided water-impermeable sheet pieces. A first roll that guides one of the water-impermeable sheet pieces to the detour, a second roll that tensions the water-impermeable sheet piece guided to the detour, and a second roll that tensions the at least one water-impermeable sheet piece to the other water-impermeable sheet piece. and a roll arranged on the same plane.