JP2004215696A - Paper diaper and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper deaper capable of stably and efficiently performing the printing of a pattern, cutting or the like with respect to a film sheet, and a method for manufacturing the same. <P>SOLUTION: In the paper diaper (1) having such a structure that an absorber is interposed between a liquid permeable top sheet (2) and a liquid impermeable back seet (3) and capable of being applied to the crotch part of the human body so as to make the top sheet inside, an air permeable polyethylene sheet (4), which is stretched by at least 2.2 times at the time of manufacture of the sheet and has elongation not more than 10% when the sheet with a width of 25 mm is stretched under a load of 1 kg, is provided on the side of the back sheet. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disposable diaper and a method for producing the disposable diaper.
[0002]
[Prior art]
Conventionally, disposable disposable diapers have a structure in which an absorber is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the top sheet side is inside, and can be attached to a crotch part of a human body. Is formed. As such a disposable diaper, there is a disposable diaper provided with a film or the like provided with a pattern or the like on a back sheet side (for example, Patent Document 1). Such a pattern has a function of expressing cuteness and facilitating discrimination of the use (for gender, etc.) and size of the disposable diaper. Further, a disposable diaper of a type which is fixed on both sides of a wearer by fastening with a tape or the like has a function of indicating a fastening position.
The film with the picture is cut after a picture or the like is printed at a predetermined position on the film sheet. Then, this film is attached to the back sheet side of the disposable diaper main body.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-266
[Problems to be solved by the invention]
However, in the process of printing, cutting, and pasting a picture or the like on the disposable diaper film, the sheet is stretched and shrunk by the tension at the time of stretching the film sheet, so that the sheet cannot be cut at an appropriate position, or When performing color printing, registration may be difficult.
In particular, when trying to increase the line speed of the production line for the disposable diaper film, the line tension increases, and the displacement due to the expansion and contraction of the sheet increases, so that it is more difficult to perform accurate printing and cutting. Therefore, there is a problem that a colorful and complicated pattern cannot be printed on the film sheet by multicolor printing or the like, or a problem that it is difficult to increase a line speed of a production line of a disposable diaper film.
On the other hand, in order to make the film sheet hard to expand and contract, for example, it is conceivable to increase the thickness of the film. In this case, since the film becomes hard, the wearing feeling when using the disposable diaper provided with the film is reduced, and there is a limit in increasing the thickness of the film sheet.
[0005]
An object of the present invention is to provide a disposable diaper and a method for manufacturing the disposable diaper, which can more stably and efficiently perform printing, cutting, and the like of a pattern on a film sheet.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 includes, for example, as shown in FIG. 1 or 2, a liquid-permeable top sheet (2) and a liquid-impermeable back sheet (3). In the disposable diaper (1) in which an absorbent body is interposed and which can be attached to the crotch of the human body with the top sheet side inward,
The backsheet side is provided with a breathable polyethylene sheet (4) that is stretched 2.2 times or more during the production of the sheet and has an elongation of 10% or less when a sheet having a width of 25 mm is stretched under a load of 1 kg. Features.
[0007]
According to the first aspect of the present invention, a breathable polyethylene is stretched 2.2 times or more on the back sheet side during the production of the sheet, and has an elongation of 10% or less when a 25 mm wide sheet is stretched under a load of 1 kg. A seat is provided.
Therefore, since the width of expansion and contraction of this breathable polyethylene sheet in the production line is reduced, for example, even if the line speed is increased in the step of printing a pattern on the breathable polyethylene sheet or in the cutting step, printing is performed more stably and efficiently. , Cutting can be done.
More specifically, since the expansion and contraction due to the variation in the tension at the time of the high-speed line is reduced, the deviation of the printing position (or the registration position) of the picture can be reduced, and the registration of the multicolor printing can be easily performed. Therefore, it is easy to print a complicated and colorful picture or the like.
Similarly, since the breathable polyethylene sheet has a small width of expansion and contraction when tension is applied on the production line, the breathable polyethylene sheet can be cut at an appropriate position.
[0008]
In the invention according to claim 2, an absorber is interposed between the liquid-permeable top sheet (2) and the liquid-impermeable back sheet (3), and the top sheet side is on the inside, and In a method for manufacturing a disposable diaper (1) that can be attached to a crotch part,
On the back sheet side, a breathable polyethylene sheet (4) that is stretched 2.2 times or more during the production of the sheet and has an elongation of 10% or less when a sheet having a width of 25 mm is stretched under a load of 1 kg is disposed. Features.
[0009]
According to the second aspect of the present invention, since the elongation percentage of the disposable diaper film is small, the efficiency of disposable diaper production can be increased, and the disposable diaper can be provided at a lower cost. In addition, since registration of multicolor printing is facilitated, printing of complicated and colorful patterns and the like is also facilitated, and a more attractive paper diaper can be provided.
[0010]
The invention according to claim 3 is a method for manufacturing a disposable diaper according to claim 2, wherein
A step of continuously printing a predetermined pattern on the breathable polyethylene sheet,
Cutting the breathable polyethylene sheet between the symbols,
Attaching the cut air-permeable polyethylene sheet to the back sheet side,
It is characterized by having.
[0011]
According to the third aspect of the present invention, since the elongation percentage of the disposable diaper film is small, the efficiency in the pattern printing step and the cutting step can be increased, and the pattern can be provided at a lower cost.
In addition, since registration of multicolor printing is facilitated, printing of complicated and colorful patterns and the like is also facilitated, and a more attractive paper diaper can be provided.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the disposable diaper 1 in the present embodiment is formed by interposing an absorber (not shown) between a liquid-permeable top sheet 2 and a liquid-impermeable back sheet 3. The back sheet 3 is provided with a film 4 (paper diaper film) on which a pattern or the like is printed.
[0013]
The film 4 is a breathable polyethylene sheet that is stretched 2.2 times or more during the production of the sheet, and has an elongation of 10% or less when a sheet having a width of 25 mm is stretched under a load of 1 kg.
The film 4 is formed by printing a picture or the like.
The film 4 is manufactured using, for example, a film sheet wound into a roll. In the production line, one end of the film sheet is developed, and the film sheet is held between rollers (not shown). The roller is conveyed on the line at a predetermined speed by applying a tension by the rotation of the roller. Further, the developed film sheet is subjected to pattern printing by a printing device (not shown), and the dried pattern is dried by a drying device (not shown), and then continuously printed by a cutting device (not shown). The printed pattern is cut at an appropriate position between the printed patterns to form a film 4, which is attached to the back sheet 3 of the disposable diaper 1.
[0014]
In this production line, if the elongation of the film sheet 10 when a sheet having a width of 25 mm is stretched under a load of 1 kg is more than 10%, the printing and cutting of the pattern and the like on the film sheet in the production line and the cutting are performed. The deviation from an appropriate position increases.
Therefore, in order to make the elongation percentage of the film sheet 10% or less, the film 4 is manufactured by the following method.
[0015]
In order to reduce the elongation of the film sheet to 10% or less, the sheet needs to be stretched 2.2 times or more during the production of the sheet.
[0016]
Considering the thickness of the film sheet, the elongation due to the tension load decreases as the thickness increases. However, if the thickness is too large, the hardness of the film sheet increases, which may affect the softness of the disposable diaper 1 and reduce the feeling of wearing during use. Therefore, the thickness of the film sheet is preferably set to be 10 <thickness (μm) <30 as long as the thickness of the film diaper 1 is not impaired.
[0017]
As described above, if the elongation percentage when tension is applied to the production line is set to 10% or less using the above-described film sheet, the deviation of the printing position of the picture or the like and the cutting position on the film sheet becomes small.
Therefore, printing can be performed at a desired position on the film sheet and cut at an appropriate position. Further, since registration in multicolor printing is facilitated, it is possible to print a complicated and colorful pattern. Further, since the elongation percentage of the film sheet at the time of printing is small, distortion or the like at the time of printing is suppressed, which is preferable.
In addition, in view of the transport speed of the film sheet in the production line, by using a film sheet having an elongation of 10% or less, the production line can be used to produce the film 4 at a high speed. Can be improved, which is preferable.
[0018]
Note that the present invention is not limited to the above embodiment.
For example, the disposable diaper 1 may be of a type in which a cover non-woven fabric is further provided outside the back sheet 3 on which the film 4 is attached. The disposable diaper may be of a type in which both sides are fastened with a fastening tape or the like, or a pants type.
Further, the printing method for printing a picture or the like on the film sheet may be any of, for example, gravure printing, flexographic printing, and ink jet printing, and can be appropriately changed. In addition, in the manufacturing process of the disposable diaper film, after the film sheet is stretched and deformed, a pattern or the like is printed thereon, the film is wound into a roll, and then the cutting process and the attaching process to the disposable diaper main body in the film production line are performed. It may be performed.
19. The method of pasting the pattern-printed film on the back sheet can be any method such as hot melt or an adhesive, and can be appropriately changed. In addition, the film sheet may be wound in a roll shape or may be folded in a zigzag manner.
Furthermore, the method for producing a disposable diaper film of the present invention may be performed in the production of products other than disposable diapers, and may be used, for example, in the production of packaging sheets.
[0019]
【The invention's effect】
According to the first aspect of the present invention, a breathable polyethylene is stretched 2.2 times or more on the back sheet side during the production of the sheet, and has an elongation of 10% or less when a 25 mm wide sheet is stretched under a load of 1 kg. A seat is provided.
Therefore, since the width of expansion and contraction of this breathable polyethylene sheet in the production line is reduced, for example, even if the line speed is increased in the step of printing a pattern on the breathable polyethylene sheet or in the cutting step, printing is performed more stably and efficiently. , Cutting can be done.
[0020]
According to the second and third aspects of the present invention, since the elongation percentage of the disposable diaper film is small, the efficiency of disposable diaper production can be improved, and the disposable diaper can be provided at a lower cost. In addition, since registration of multicolor printing is facilitated, printing of complicated and colorful patterns and the like is also facilitated, and a more attractive paper diaper can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a disposable diaper provided with a picture-attached film.
[Explanation of symbols]
1 disposable diaper 2 top sheet 3 back sheet 4 film (film for disposable diaper)

Claims (3)

In a disposable diaper in which an absorbent is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the top sheet side is inside and can be attached to a crotch part of a human body,
On the back sheet side, there is provided a breathable polyethylene sheet which is stretched 2.2 times or more during the production of the sheet, and has an elongation of 10% or less when a sheet having a width of 25 mm is stretched under a load of 1 kg. Disposable diapers. In a method of manufacturing a disposable diaper, a liquid-permeable top sheet and a liquid-impermeable back sheet are provided with an absorber interposed therebetween, and the top sheet side can be placed inside and attached to a crotch of a human body.
On the back sheet side, a breathable polyethylene sheet which is stretched 2.2 times or more at the time of manufacturing the sheet and has an elongation of 10% or less when a sheet having a width of 25 mm is stretched under a load of 1 kg is arranged. Manufacturing method of disposable diapers. A step of continuously printing a predetermined pattern on the breathable polyethylene sheet,
Cutting the breathable polyethylene sheet between the symbols,
Attaching the cut air-permeable polyethylene sheet to the back sheet side,
The method for producing a disposable diaper according to claim 2, comprising:

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