JPH09564A - Manufacture of disposable diaper - Google Patents

Abstract

PURPOSE: To provide a disposable diaper having high fitness around legs, and ensuring a waist free from a clearance t as well as a high function of preventing liquid leakage. CONSTITUTION: A disposable diaper 1 has a top sheet 2, a back sheet 3 and an absorber 4, and elastic members 10 are arranged thereon to form leg gathers. Also, the members 10 are arranged to cover an area from a stomach section A to a crotch section B via a back section C respectively of the diaper. Regarding a method for manufacturing the disposable diaper 1, an elastic member arrangement process is established for feeding the elastic members 10, the top sheet 2 and the back sheet 3,respectively all at once and continuously for the arrangement of the members 10 at the prescribed positions. When the sections A and C are formed at a process, the top sheet 2, the back sheet 3 and the elastic members 10 are fed at an equal speed. Also. when the section C is formed, the feed rate of the members 10 is made lower than the feed rate of the top sheet 2 and the back sheet 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a disposable diaper which is excellent in fit and liquid leakage prevention and can be manufactured with high productivity.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a disposable diaper 101 has a liquid-permeable top sheet (not shown) and a liquid-impermeable back sheet 103. The top sheet and the back sheet 1
03 and an absorber (not shown) interposed between them, the elastic members 110 are arranged to form leg gathers, and in the vertical direction thereof, the ventral side portion A and the back side portion C are provided.
And a crotch portion B located between the ventral side portion A and the back side portion C
It is divided into.

The elastic member 110 forming the leg gathers has the ventral side portion A and the back side portion C.
The diaper was stretched mainly only on the crotch portion B so as not to be stretchable in the vertical direction. Then, the disposable diaper having the elastic member arranged in this manner is a continuous body of a backsheet or a topsheet to which an adhesive is applied only to a portion corresponding to the crotch part, and an elastic member in a stretched state is laid to continuously connect the diaper. It was manufactured industrially by manufacturing a body and cutting the continuous body at a predetermined position.

However, the conventional disposable diaper 101 manufactured in this manner does not have an adhesive applied to the abdominal side and the dorsal side so that the elastic member in the stretched state is not fixed, as shown in FIG. As described above, there is a problem in that the mouth opening 130 does not occur in the waist portion on the ventral side and the back side of the diaper, and liquid leakage occurs from the mouth opening 130.

Therefore, an object of the present invention is to provide a method of manufacturing a disposable diaper which is excellent in fit around the legs, does not cause mouth opening at the waist and has excellent liquid leakage prevention performance.

[0006]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have determined that the supply speed of the elastic member is set to the supply speed of the topsheet and the backsheet in the region corresponding to the crotch of the diaper. It was found that the above-mentioned object can be achieved by decelerating in comparison.

The present invention has been made on the basis of the above findings, and includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed between the top sheet and the back sheet. A leg gather is formed by arranging an elastic member, and the elastic member extends over the abdominal part, the dorsal part and the crotch part located between the abdominal part and the dorsal part of the diaper. A method for producing a disposable diaper that is arranged, wherein the elastic member, an outer surface material located outside the elastic member, and an inner surface material located inside are respectively supplied simultaneously and continuously, An elastic member arranging step of arranging the elastic member at a predetermined position between the outer surface material and the inner surface material, wherein in the elastic member arranging step, when the abdominal side portion and the back side portion are formed, The outer surface material, the inner surface material, and the elastic portion And at the same speed to form the crotch part, the supply speed of the elastic member is slower than the supply speed of the outer surface material and the inner surface material, a method for manufacturing a disposable diaper, characterized in that Is provided.

[0008]

According to the method for producing a disposable diaper of the present invention,
When forming the abdominal part and the back part, the inner surface material and the outer surface material and the elastic member are supplied at the same speed, and when forming the crotch part, the supply speed of the elastic member is decelerated. The elastic members can be arranged in a relaxed state on the side portions and the back side portion, and the elastic members can be arranged in a stretched state on the crotch portion.

[0009]

EXAMPLE In order to carry out the method for producing a disposable diaper of the present invention, the elastic member, the outer surface material located outside the elastic member, and the inner surface material located inside are simultaneously and continuously, respectively. When the elastic member arranging step of supplying and arranging the elastic member at a predetermined position between the outer surface material and the inner surface material is performed, the outer surface material and the back surface part are formed. Supplying the inner surface material and the elastic member at the same speed, when forming the crotch portion, the supply speed of the elastic member is reduced from the supply speed of the outer surface material and the inner surface material,
It can be carried out.

In order to simultaneously and continuously supply the elastic member, the outer surface material and the inner surface material, respectively, a continuous body of the elastic member, a continuous body of the outer surface material and a continuous body of the inner surface material are provided. , Can be supplied at the same time. Examples of the predetermined position where the elastic member is arranged include both left and right side portions in the longitudinal direction (up and down direction) of the diaper. Further, in forming the ventral side portion and the back side portion, in order to supply the outer surface material and the inner surface material and the elastic member at the same speed, the continuous body of the elastic member and the outer surface material are continuous. This can be done by transferring the body and the continuous body of the inner surface material at the same speed. Further, when forming the crotch part, in order to reduce the supply speed of the elastic member than the supply speed of the outer surface material and the inner surface material,
The supply speed of the elastic member is gradually reduced from the same speed as the supply speeds of the outer surface material and the inner surface material, and when it reaches a peak (when it is formed up to almost the midpoint of the crotch), it is gradually accelerated and again. The supply speed of the outer surface material and the inner surface material may be the same, or the supply of the elastic member may be intermittently stopped by an ordinary stopper device. The rate of deceleration at this time is arbitrary according to the desired expansion rate of the elastic member, but is preferably 75% to 40% of the speed before deceleration.

That is, in the elastic member arranging step in the manufacturing method of the present invention, since the elastic member, the outer surface material and the inner surface material are continuously supplied, respectively, the belly side portion, the crotch portion, and the crotch portion of the diaper. The back side is formed sequentially and continuously, and the elastic member is arranged in the relaxed state on the ventral side and the back side of the diaper and in the stretched state on the crotch part.

Hereinafter, the disposable diaper obtained by the production method of the present invention and the production apparatus preferably used in the production method of the present invention will be illustrated and the production method of the present invention will be described in more detail.

First, a preferred disposable diaper obtained by the manufacturing method of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view showing an example of a disposable diaper obtained by the manufacturing method of the present invention, FIG. 3 is a partially cutaway development view of the disposable diaper shown in FIG. 2, and FIG.
FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

The disposable diaper 1 of this embodiment shown in FIGS. 2 and 3 has a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a space between the top sheet 2 and the back sheet 3. The elastic member 10 including the absorber 4 interposed
Are arranged to form leg gathers 7, and the elastic member 10 includes a crotch part B located between the abdomen A, the back C and the abdomen A and the back C of the diaper. It is distributed over.

More specifically, the above disposable diaper 1
The fastening tape 8 is provided on each of the left and right edges of the waist portion 5 of the back side portion C, and the fastening tape 8 is attached to the landing tape 9 provided on the surface of the back sheet 3 for use. It is a type of disposable diaper.

In the disposable diaper 1, the central portion in the longitudinal direction is curved in an overflowing hourglass shape to form leg portions 6, and the waist portion 5 of the abdominal portion A and the back portion C is formed. The elastic members 5'of the waist portion are arranged on each of them. Further, as the top sheet 2, the back sheet 3, the absorber 4, and the elastic member 10,
Conventionally known materials can be used without particular limitation.

Then, as shown in FIG.
Is a tubular portion 20 formed by heat-sealing the backsheet 3 as an outer surface material located outside the elastic member 10 and the topsheet 2 as an inner surface material located inside, on the left and right sides thereof. Have The tubular portion 20
Is heat-sealed at four places along the curved shape of the leg portion 6 on the left and right sides of the crotch portion C, and the top sheet 2 and the back sheet 3, respectively, in an arc shape along the leg portion 6, Three are provided each.

The elastic members 10 are continuously arranged from the edge of the abdominal part A to the edge of the dorsal part C, and the abdominal part A and the dorsal part C are provided. In the relaxed state, the back sheet 3 and the top sheet 2 are bonded and fixed to each other, and the crotch portion B is inserted in the tubular portion 20 in the stretched state and bonded to the back sheet 3 and the top sheet 2. It is arranged without it and the above-mentioned leg gather 7
Is formed.

Next, a preferable manufacturing apparatus used for carrying out the manufacturing method of the present invention will be described with reference to FIGS. 5 and 6. Here, FIG. 5 is a schematic view showing a main part of the manufacturing apparatus of the present invention, and FIG. 6 is a front view showing a heat seal member in the manufacturing apparatus shown in FIG.

The manufacturing apparatus 50 used in the present invention comprises a pair of two rollers 52 and two rollers 52.
Are heat-sealed in parallel on each of the left and right sides of the topsheet 2 as the inner surface material and the backsheet 3 as the outer surface material, which are continuously provided in the circumferential direction thereof at predetermined intervals. The heat-sealing member 51 has four convex portions 53 that form the tubular portion 20. Further, the convex portions 53 of the two rollers 52 are provided so as to correspond to each other, and the convex portions 53 are the linear portion 53a along the circumferential direction and the inside of the rollers. The curved portion 53b is curved toward one side.

In order to carry out the manufacturing method of the present embodiment, as shown in FIG.
The continuous sheet 3'of the backsheet 3 as the outer surface material located outside the elastic member 10 and the continuous sheet 2'of the top sheet 2 as the inner surface material located inside the elastic member 10 are respectively the heat seal member 51. By supplying them simultaneously and continuously, and performing the elastic member arranging step of arranging the elastic members between the outer surface material and the inner surface material and on both left and right edges of the diaper. be able to.

Then, in the elastic member installation step,
When forming the abdominal part A and the back part C, the supply speed S1 of the continuous sheet 2'of the top sheet and the supply speed S3 of the continuous sheet 3'of the back sheet and the continuous body of the elastic member. The continuous sheet 2'of the top sheet, the continuous sheet 3'of the back sheet, and the continuous body 10 'of the elastic member are the same as the supply rate S2 of 10'.
Is supplied to the heat seal member 51, and the crotch part B is
When forming, the supply speed S2 of the continuous body 10 ′ of the elastic member is made lower than the supply speed S1 of the continuous sheet 2 ′ of the top sheet and the supply speed S3 of the continuous sheet 3 ′ of the back sheet. Then, it can be carried out.

More specifically, in the continuous sheet 3'of the back sheet, the absorbent body 4 and the elastic member 5'of the waist portion are placed at the treatment position and the diaper is prepared by the known method. Adhesives are applied to the left and right sides of the regions corresponding to the abdominal side and the dorsal side. Thereby, through the elastic member arranging step, the continuous sheet 2 ′ of the top sheet and the continuous sheet 3 ′ of the back sheet are integrated by disposing the continuous body 10 ′ of the elastic member,
A continuous sheet 1'of the diaper is formed. Further, in the elastic member arranging step, the elastic member continuum 10 ′ is provided.
As shown in FIG. 6, the elastic members 10 are respectively drawn between the convex portions 53, whereby the tubular portion 20 is formed and the elastic member 10 is inserted into the tubular portion 20 at the same time.

When forming the ventral side and dorsal side of the diaper (at the portions where the continuous sheets 2'and 3'contact the linear portions 53a of the rollers 52),
The supply speed S1 and the supply speed S3 (S1 = S3) and the supply speed S2 are set to the same speed (S1 = S2 = S3), and the crotch portion is formed (each continuous sheet 2 ′, 3 ′ is the above roller 52). (At the portion that abuts the curved portion 53b)
Supply speed S2 to supply speed S1 and supply speed S3 (S
Deceleration (S1 = S3> S2) rather than 1 = S3). Here, the supply speeds S1 and S2 are respectively the same as the rotation speed S4 of the roller 52, and the transfer speed S5 of the continuous body 1 ′ of the diaper is also the same speed.
In order to decelerate the supply speed S2, the supply amount in the arrow direction (the arrow indicating the transfer direction of the continuous body 10 ') shown in FIG. 6 is reduced to decrease the transfer speed of the continuous body 10'. This can be done by adopting a variable speed mechanism of the feed roll supplying the continuum 10 ', or
Alternatively, it can be performed by intermittently stopping the supply of the continuous body 10 'by a stopper device.

Further, the disposable diaper 1 can be obtained by cutting the continuous sheet 1'of the diaper obtained through the elastic member arranging step at a predetermined position.

As described above, in the disposable diaper 1 obtained by the manufacturing method of the present invention, as described above, the elastic member 10 is relaxed in the abdomen A and the back C, and the top sheet 2 is used. Also, since it is adhesively fixed by the back sheet 3, there is no opening of the mouth,
It does not cause liquid leakage from the waist. Also,
In the crotch portion C, since the elastic member 10 is inserted and arranged in the tubular portion 20, the elastic member 1
It can be arranged in a desired shape without being affected by the stretchability of 0 and is excellent in fit.

The manufacturing method of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the expandable diaper has been described as an example, but the invention can also be applied to a pants-type disposable diaper. Further, a member other than the back sheet and the top sheet may be used as the outer surface material or the inner surface material, and the tubular portion may be a straight line. Further, the heat sealing forming the tubular portion may be performed not continuously but intermittently along the longitudinal direction of the diaper. Further, sealing may be performed by a sealing method other than heat sealing, for example, hot melt adhesive or ultrasonic waves.

[0028]

According to the manufacturing method of the present invention, it is possible to obtain a disposable diaper with excellent productivity, which has excellent fit around the legs, does not cause mouth opening at the waist, and has excellent liquid leakage prevention performance. .

[Brief description of drawings]

FIG. 1 is a development view showing a conventional disposable diaper with its topsheet and absorbent body omitted.

FIG. 2 is a perspective view showing an example of a disposable diaper obtained by the manufacturing method of the present invention.

FIG. 3 is a partially cutaway exploded view showing the disposable diaper of the present invention shown in FIG.

4 is a cross-sectional view taken along the line IV-IV of the diaper shown in FIG.

FIG. 5 is a schematic view showing a main part of a preferable manufacturing apparatus used in the present invention.

6 is a front view showing a heat seal member in the manufacturing apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Topsheet 3 Backsheet 4 Absorber 5 Waist part 6 Leg part A A ventral side part B Crotch part C Dorsal part 10 Elastic member 20 Tubular part 50 Manufacturing device 51 Heat seal member 52 Roller 53 Convex part 53a Straight line Part 53b curved part

Claims (1)

[Claims] 1. A leg sheet having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between the top sheet and the back sheet, wherein an elastic member is arranged to form a leg gather. The elastic member is formed,
A method for producing a disposable diaper arranged over the abdominal part, the dorsal part and the crotch part located between the abdominal part and the dorsal part, wherein the elastic member and the elastic member are provided. An outer member located outside and an inner member located inside are simultaneously and continuously supplied to dispose the elastic member at a predetermined position between the outer member and the inner member. In the elastic member arranging step, when forming the abdominal side portion and the back side portion in the elastic member arranging step, the outer surface material and the inner surface material and the elastic member are supplied at the same speed, The method for producing a disposable diaper, characterized in that, when forming the part, the supply speed of the elastic member is slower than the supply speed of the outer surface material and the inner surface material.