JP4989088B2 - Method for manufacturing disposable wearing articles - Google Patents

Description

  The present invention relates to a method of manufacturing a disposable worn article.

For example, as a method for continuously producing worn articles such as disposable diapers and pants, a method has been proposed in which an absorber is disposed between a pair of webs that are continuously fed in the flow direction (Patent Document 1).
WO2005-044168 (FIG. 4)

Hereinafter, the structure and manufacturing method of the disposable wearing article of Patent Document 1 will be described.
As shown in FIG. 4A, a diaper (an example of a disposable wearing article) 1 includes a back portion 2 having fastening members 5 made of, for example, hook-and-loop fasteners at both ends in the waistline direction L, and stretchable in the waistline direction L. An abdominal portion 3 having flap portions (gripping portions when fastened) 6 at both ends in the waistline direction L and a core portion 4 straddling the back portion 2 and the abdominal portion 3 are provided. The core portion 4 is provided with an absorbent body 4a that absorbs and holds body fluids such as urine and feces discharged from the body. Leg elastic members 7 may be provided at both ends of the core portion 4 in order to improve fit.

In order to manufacture the diaper 1, as shown in FIG. 4B, a body-fit elastic member 2a and a waist elastic member 2b are placed between the two continuous webs 2W and 2W for the back. The elastic laminate 2S for the back portion is formed by being sandwiched in the longitudinal direction L.
Thereafter, as shown in FIG. 4C, the elastic layered body 2S for the back portion in the stretched state is relaxed, and the elastic layered body for back portion 2S and the continuous web 3W for the abdomen are conveyed in parallel, and the core portion 4 is used for the back portion. It is attached so as to straddle the elastic laminate 2S and the abdomen continuous web 3W. Due to the relaxation, the length of the elastic layered body 2S for the back corresponding to the back 2 is reduced from the length L100 in the stretched state (FIG. 4B) to the length L200 contracted. Then, it is cut into individual diapers 1, and the elastic laminate 2S for the back and the continuous web 3W for the abdomen become the back 2 and the abdomen 3, respectively.

  In this manufacturing method, the attachment portion 2c of the back elastic laminate 2S to which the core portion 4 is attached is reduced in contraction force of the attachment portion 2c by cutting the body fitting elastic member 2a, and the attachment portion 2c is wrinkled. It is mitigating the occurrence.

However, since the waist elastic member 2b is adhered to the end 2d corresponding to the waist opening portion of the back elastic laminate 2S, when the back elastic laminate 2S is relaxed, the waist elasticity It is impossible to sufficiently prevent the attachment portion 2c from contracting due to the contraction force of the member 2b and causing wrinkles in the attachment portion 2c portion.
Therefore, there is a possibility that the core portion 4 cannot be attached neatly due to the wrinkles generated in the attachment portion 2c.

  Therefore, the main object of the present invention is to provide a method for producing a disposable wearing article that can be neatly and reliably attached with an absorbent body.

To achieve the above object, a method for producing a disposable worn article of the present invention, back and abdomen and, Ri span between the back and abdomen, the core portion where the absorber for absorbing body fluids has been furnished A step of forming a back elastic laminate by intermittently disposing a stretched first elastic member along a flow direction on a back continuous web; Relaxing the extension of the first elastic member of the back elastic laminate, transporting the abdomen continuous web in parallel to the back elastic laminate, and the first of the back elastic laminate. Disposing the core portion so as to straddle between the non-elastic portion where the elastic member does not exist and the abdomen continuous web and not overlapping the first elastic member; and stretching after relaxing the second elastic member for waist And a step of continuously disposed across sites and said placing the first elastic member along the opening portion of the waist of the back elastic laminate inelastic portion.

According to the present invention, since the first elastic member is not disposed in the non-elastic portion where the core portion is disposed, there is no possibility that wrinkles are generated in the non-elastic portion even if the first elastic member is relaxed. Therefore, the core part can be neatly attached to the inelastic part. Moreover, since wrinkles do not occur in the non-elastic portion, the core portion sufficiently adheres to the non-elastic portion, and the adhesive force does not decrease.
Furthermore, since the 2nd elastic member for waists is arrange | positioned after arrangement | positioning of a core part, the fitting property of this wearing article with respect to a wearer does not fall.

  The “disposable wearing article” is a concept including semi-finished products and finished products of disposable wearing articles such as disposable diapers and pants.

  The invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings, in which: However, the examples and figures are for illustration and description only and should not be used to define the scope of the present invention. The scope of the present invention is defined only by the claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Manufacturing process:
First, an example of the manufacturing process of the diaper 1 will be described.
As shown in FIG. 1A, after the elastic film 10a and the nonwoven fabric 10b stretched in the conveying direction L are bonded together to generate the elastic sheet 10S, the elastic sheet 10S is cut at a predetermined interval and the first elastic member 10 is generated.

As the elastic film 10a, for example, a polyurethane elastic film, a polyolefin elastic film, a polystyrene elastic film, or the like can be used. Further, instead of the elastic film 10a, a plurality of thread-like natural rubber parallel to the conveying direction L, thread-like synthetic rubber, polyurethane elastic yarn, or the like may be attached to the nonwoven fabric to generate the elastic sheet 10S. .
In addition, the width H1 of the nonwoven fabric 10b substantially orthogonal to the conveyance direction L may be approximately the same as the width H2 of the elastic film 10a, or the width H1 of the nonwoven fabric 10b may be larger than the width H2 of the elastic film 10a. .

As shown in FIG. 1B, the back elastic laminate 2 </ b> S is generated by disposing the first elastic member 10 intermittently in a stretched state along the flow direction L on the back continuous web 2 </ b> W. That is, the first elastic member 10 having a length L1 in the flow direction L at the time of extension is continuously arranged at every predetermined interval L3. Due to the arrangement of the first elastic member 10, a non-elastic part 2 a in which the first elastic member 10 is not arranged is generated in the back elastic laminate 2 </ b> S.
In addition, the fastening member 5 may be affixed on the back surface of the back continuous web 2W. The fastening member 5 may be a tape-like member folded in a double Z shape in FIG. 1C and adhered to the continuous web 2W at both ends thereof.

After that, as shown in FIG. 2A, the first elastic member 10 is relaxed in the flow direction L, so that the length of the first elastic member 10 in the flow direction L is extended from the long L1 (FIG. 1B). The contracted state is short L2. On the other hand, the length L3 of the non-elastic portion 2a where the first elastic member 10 is not disposed is maintained at the length L3 without being affected by the contraction of the first elastic member 10.
On the other hand, the abdomen continuous web 3W is conveyed in parallel with the relaxed elastic layer for back 2S.

  Then, the core part 4 is arrange | positioned so that it may straddle between the said inelastic part 2a of the said elastic part 2S for back parts, and the continuous web 3W for abdominal parts. The core 4 is preliminarily provided with an absorber 4a. The absorbent body 4a only needs to be able to absorb and retain body fluids, and may have, for example, fluff pulp obtained by pulverizing pulp and / or superabsorbent polymer.

  Here, as described above, the length L3 of the non-elastic portion 2a of the back elastic laminate 2S is maintained at the same length L3 without being affected by the contraction of the first elastic member 10. Therefore, wrinkles due to contraction of the first elastic member 10 do not occur in the inelastic portion 2a. Since the core part 4 is arrange | positioned at the non-elastic part 2a which the wrinkle does not produce, the core part 4 can be attached neatly to the elastic laminated body 2S for back parts. In addition, since wrinkles are not generated in the non-elastic portion 2a, the core portion 4 is sufficiently adhered to the non-elastic portion 2a, and the adhesive force between the core portion 4 and the back elastic laminate 2S does not decrease.

  Thereafter, as shown in FIG. 2B, the second elastic member 2b for the waist is formed on the back elastic laminate 2S, and the end 2d corresponding to the waist opening (the abdomen continuous web 3W for the back elastic laminate 2S) Are arranged along the opposite end). Almost simultaneously with the arrangement of the second elastic member 2b or after the arrangement, the end 2d of the back elastic laminate 2S is folded and fixed, and the second elastic member 2b is attached to the edge of the continuous web 2W. It is pinched and fixed.

  After the arrangement of the second elastic member 2b, the leg holes 17 are cut off, and as shown in FIG. 2C, the abdomen continuous web 3W is folded toward the back elastic layered body 2S around the core part 4, It is cut into individual diapers 1.

Production method:
Next, an example of a method for manufacturing the diaper 1 will be described.
As shown in the lower left of FIG. 3, the fastening member 5 is intermittently stuck to the back surface of the back continuous web 2W. The fixing member 5 is attached by, for example, an attaching device 51 made of sonic or the like.

On the other hand, as shown in the lower center of FIG. 3, the elastic film 10 a is stretched by the tension roller 30 and then stuck to the nonwoven fabric 10 b to generate the elastic sheet 10 </ b> S shown in FIG. 1A.
The elastic sheet 10S is cut by the cutter 31c while the stretched state is maintained, and the first elastic member 10 is generated. The first elastic member 10 is expanded to a length L3 (FIG. 1B) by the re-pitch drum 31.
The first elastic member 10 is affixed to the back continuous web 2W while the stretched state shown in FIG. 1B is maintained on the re-pitch drum 31 to generate the back elastic laminate 2S.

  After the back elastic laminate 2S is generated, the first elastic member 10 is relaxed by the relaxation drum 32 of FIG. Due to such relaxation, the length L1 of the first elastic member 10 shown in FIG. 1B is contracted to the length L2 shown in FIG. 2A. Note that the length L3 of the inelastic portion 2a does not change. The back elastic laminate 2 </ b> S that has undergone the relaxation process by the relaxation drum 32 is sent to the sticking drum 33.

  On the other hand, when the abdomen continuous web 3W is sent to the affixing drum 33, as shown in FIG. 2A, the back elastic laminate 2S and the abdomen continuous web 3W are conveyed in parallel (parallel) on the affixing drum 33. Is done.

  As shown on the right side of FIG. 3, the core portion 4 is cut into a predetermined length by the cutter 40 and sent to the re-pitch turn drum 34. In the re-pitch turn drum 34, the interval between the adjacent core portions 4 is widened and rotated and sent to the sticking drum 33. The rotation angle by the re-pitch turn drum 34 may be 90 ° or may be rotated by 270 °.

  In the sticking drum 33, as shown in FIG. 2A, the core portion 4 is disposed so as to straddle between the back elastic laminate 2S and the abdomen continuous web 3W which are conveyed in parallel.

  Thereafter, as shown in FIG. 2B, after the second elastic member 2b is arranged at the end of the back elastic laminate 2S, the first folding machine 41 shown in FIG. Part 2d (FIG. 2B) is folded and pasted.

After the arrangement of the second elastic member 2b, the leg hole 17 (FIG. 2B) is cut out in the back elastic laminate 2S by the downstream die cutter 35 and sent to the second folding machine 42 downstream.
In the second folding machine 42, as shown in FIG. 2C, the core portion 4 is folded so that the back elastic laminate 2S and the abdomen continuous web 3W overlap with each other around the core portion 4.

  Thereafter, the back elastic laminate 2S and the abdomen continuous web 3W are cut by the cutter 36 and cut into individual diapers 1. As shown in FIG. 2C, in the cutting, the center between the adjacent core parts 4 is cut so as to bisect the fastening member 5, and the back part 2 and the abdominal part 3 are generated, respectively.

Stop Chakubuzai 5 may be attached after a back elastic laminate 2S and abdominal continuous web 3W is folded. As the fastening member 5, for example, an adhesive tape may be used in addition to the hook-and-loop fastener. Further, the diaper 1 may be formed in a pants shape by bonding the back portion 2 and the abdominal portion 3 together.

  Further, the end of the abdomen continuous web 3W opposite to the back elastic laminate 2S (the portion corresponding to the waist opening) may be folded back and then adhered to each other. The abdomen continuous web 3W may be a composite sheet made up of a plurality of sheets, or the second elastic member 2b may be provided at the end of the abdomen continuous web 3W.

  The present invention can be applied to a method for producing disposable wearing articles such as disposable diapers and pants.

1A is a schematic perspective view showing a manufacturing process of a first elastic member according to an embodiment of the present invention, FIG. 1B is a process drawing showing a manufacturing process of an elastic laminate for a back portion, and FIG. 1C shows a shape of a fastening member. It is a schematic side view. It is process drawing which shows the manufacturing process of a disposable wearing article. It is a schematic side surface layout diagram which shows the manufacturing apparatus of the wearing article. FIG. 4A is a schematic plan view showing a conventional disposable wearing article in an expanded state, and FIGS. 4B and 4C are process diagrams showing a manufacturing process of the wearing article.

Explanation of symbols

2: Back part 2a: Non-elastic part 2b: Second elastic member 2S: Elastic laminate for back part 2W: Continuous web for back part 3: Abdominal part 3W: Continuous web for abdominal part 4: Core part 10: First elastic member

Claims (2)

A back, and abdomen, Ri span between the back and abdomen, a method of absorber for absorbing body fluids to produce a disposable wearing article having a core portion is decorated,
Forming a back elastic laminate by intermittently disposing a stretched first elastic member along the flow direction on a back continuous web;
Relaxing the extension of the first elastic member of the elastic laminate for the back portion;
Transporting the abdomen continuous web in parallel to the back elastic laminate;
The core portion is disposed so as to straddle between the non-elastic portion where the first elastic member of the back elastic laminate does not exist and the abdomen continuous web and does not overlap the first elastic member. And a process of
After relaxing the extension of the first elastic member, the second elastic member for the waist is continuously provided over the portion where the first elastic member is disposed along the opening portion of the waist of the elastic layered body for the back and the inelastic portion. A method for producing a disposable worn article comprising the step of placing the target. 2. The first elastic member according to claim 1, substantially simultaneously with the arrangement of the second elastic member or after the arrangement of the second elastic member, after the end portion along the longitudinal direction of the elastic layered body for the back portion is folded back, The method further includes a step of being sandwiched and fixed by an edge of the elastic laminate for the back portion .

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