JP2004208836A - Disposable diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable diaper having a design with good visibility without using a figure film or the like as a separate part. <P>SOLUTION: In the disposable diaper, an exterior sheet 1 is formed by superposing an outer nonwoven fabric sheet 1a and an inner nonwoven fabric sheet 1b, and the design D is printed on the surface of the outer nonwoven fabric sheet 1a on the exterior surface side. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disposable diaper worn by infants.
[0002]
[Prior art]
The disposable diaper is printed with a design such as a continuous pattern, a design, a one-point mark, etc. to improve aesthetics. In the related art, a design is printed on a waterproof film, or a design film on which the design is printed is attached to the inside of an exterior sheet (for example, see Patent Literature 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-54536
[Problems to be solved by the invention]
However, as seen in pants-type diapers, in a disposable diaper in which the outer sheet has a double sheet structure in which an outer side nonwoven sheet and an inner side nonwoven sheet are overlapped, printing is performed on a waterproof film located below the disposable diaper. Since the designed design can be viewed from the outside only through the double sheet, there is a problem that visibility is deteriorated. Also, if the design film is attached to the outer surface side nonwoven fabric sheet, the visibility is improved, but there is a problem that a separate film is required and the cost is increased.
[0005]
[Means for Solving the Problems]
The present invention, in order to solve the above problems, in a disposable diaper configured by superimposing an outer nonwoven sheet and an inner nonwoven sheet on the outer sheet, the outer sheet inner space side surface of the outer sheet, or A design is printed and formed on the surface of the inner nonwoven sheet on the space side in the outer sheet.
[0006]
According to the present invention, since the design is formed by printing on the surface of the outer non-woven fabric sheet on the space side of the exterior sheet or the surface of the inner non-woven fabric sheet on the space side of the exterior sheet, one sheet (external surface) The design can be seen through the side nonwoven fabric sheet), and the visibility of the design becomes good. In addition, since the design is located in the interior space of the exterior sheet, it is not touched during use and does not come into contact with other objects, so that the aesthetics of the design can be maintained. In addition, since no special design film is used, the cost does not increase.
[0007]
In the present invention, it is preferable that the ink for design printing has heat resistance and friction resistance. If the design is printed on the non-woven fabric using such ink, the design may be peeled off, discolored, or stained on the processing machine due to heating or mechanical friction during side sealing (heat welding) in the production line. Can be prevented.
[0008]
As the heat resistance of the ink, those having a heat resistance of 160 ° C. are preferable, and those having a heat resistance of 200 ° C. are most preferable. The rub resistance of the ink was evaluated in 5 steps (excellent) 5-1 by Toyo Ink Measurement Method (Gakushin-type friction fastness tester: 0.2 × 9.8 N (200 g) 50 times vs. high quality paper) 5-1 ( It is preferable that the evaluation of (poor) is 4 or 5.
[0009]
In the present invention, when the outer side nonwoven sheet and the inner side nonwoven sheet have a basis weight of 50 g / m ² or less and a fineness of 1.0 dtx to 5.0 dtx, the printing on the designed nonwoven sheet is excellent and the adhesive strength is excellent. Which is preferred. In addition, it is preferable that the outer surface side nonwoven sheet and the inner surface side nonwoven sheet have good design visibility if the blending ratio of titanium oxide is controlled to 5.0 wt% or less.
[0010]
In the present invention, it is preferable that the design includes a plurality of straight lines parallel to each other along the diaper longitudinal direction and / or a plurality of parallel straight lines along the diaper width direction.
[0011]
With these straight lines, the presence or absence and the amount of displacement of the absorber and the post-processing tape with respect to the outer sheet can be visually recognized at the time of a sampling test during manufacturing.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the illustrated pants-type disposable diaper as an example.
[0013]
1 to 3, 1 is an exterior sheet, 2 is a waterproof sheet, 3 is an absorber, 4 is an interior sheet, 5 is a body opening, 6 and 6 are leg openings, 7 is a front body, and 8 is a back body. It is.
[0014]
The exterior sheet 1 has a double sheet structure in which an outer-side nonwoven sheet 1a and an inner-side nonwoven sheet 1b are overlapped. In the inner space of the exterior sheet 1, stretchable cords extending in the width direction of the diaper are arranged in multiple stages in the upper and lower portions to form a large number of gathers which contract in the width direction on both upper sides of the front body 7 and upper sides of the rear body 8. However, such an elastic string is not provided in the illustrated example.
[0015]
The outer non-woven fabric sheet 1a and the inner non-woven fabric sheet 1b are non-woven fabrics each made of a fiber having a core of PET and an outer periphery of PE, and have a basis weight of 20 g / m ² , a fineness of 2.0 dtex, and a titanium oxide compounding ratio of 4. 0.0 wt% is used. On the outer space side surface of the outer nonwoven fabric sheet 1a, a lattice-shaped design D as shown by hatching in FIGS. 1 and 2 covers almost the entire surface of the pants from the front body 7 to the back body 8. Print formed. The plurality of longitudinal straight strip d ₁ of which constitutes the design D checkered are formed along parallel diaper longitudinal directions, multiple transverse straight strip d ₂ of the book parallel along the diaper width direction to each other Is formed. As the printing ink 9 of the design D, one having a heat resistance of 200 ° C. and a rub resistance of 4 in the Toyo Ink Measurement Method, that is, an ink having excellent heat resistance and rub resistance is used.
[0016]
The waterproof sheet 2 located inside the exterior sheet 1 is made of a PE film. The absorber 3 located inside the waterproof sheet 2 is composed of defibrated pulp and a high-molecular water-absorbing polymer. The interior sheet 4 which is located inside the waterproof sheet 2 and is in contact with the skin of the wearer is a nonwoven fabric made of a fiber having a core of PET and an outer periphery of PE, and has a basis weight of 22 g / m ² and a fineness of 2. 2dtex one is used.
[0017]
The positions of the upper side U ₁ of the front body 7 of the absorber 3, the upper side U ₂ , the left side S ₁ , and the right side S ₂ of the back body 8 are, as shown in FIGS. is set to a position close to the strip d ₂ or longitudinal straight strip d _1, during the sampling test during production, with respect to the absorbent body 3 is the exterior sheet 1, whether or not is disposed on the displacement without the correct position , So that it can be visually determined.
[0018]
The position in the lateral direction of the post-processing tape 10 is stuck in the top center of the back body 8, at a position overlapping the longitudinal straight strip d ₁ of the center, the upper end position of the post-processing tape 10, the transverse linear zone d ₂ is set at a position having a predetermined relationship with one of the _two , so that it can be visually determined whether or not the post-processing tape 10 is stuck to the correct position of the exterior sheet 1.
[0019]
The present invention can take various forms in addition to the above-described embodiment. For example, as shown in FIG. 4, a design D is formed by using the ink 9 on the surface of the inner non-woven fabric sheet 1b on the space side in the outer sheet. Can be printed and formed. As the design D, a pattern composed of a plurality of straight lines parallel to each other along the diaper longitudinal direction and a pattern composed of a plurality of straight lines parallel to each other along the diaper width direction are employed, and these are printed on the entire surface of the diaper. You can also. Further, as the design D, a pattern such as an animal or a flower can be adopted. Although the above embodiment relates to a pants-type disposable diaper, the present invention can be applied to a flat-type disposable diaper.
[0020]
【The invention's effect】
The present invention can provide a disposable diaper having a design with good visibility without using a separate design film or the like.
[Brief description of the drawings]
FIG. 1 is a front view showing a disposable diaper according to an embodiment of the present invention.
FIG. 2 is a rear view thereof.
FIG. 3 is a sectional view taken along line AA of FIG. 1 in a front body.
FIG. 4 is a cross-sectional view of a portion corresponding to line AA of FIG. 1 in a front body of a disposable diaper according to another embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 exterior sheet 1a outer-side nonwoven sheet 1b inner-side nonwoven sheet 9 ink D design

Claims (5)

In the disposable diaper in which the outer sheet is formed by laminating the outer nonwoven sheet and the inner nonwoven sheet, the outer sheet inner space side of the outer nonwoven sheet or the outer sheet inner space side of the inner nonwoven sheet A disposable diaper characterized by having a design printed on the surface of the diaper. The disposable diaper according to claim 1, wherein the ink for design printing has heat resistance and friction resistance. The outer surface side non-woven fabric sheet and the inner side nonwoven fabric sheet, the basis weight 50 g / ^{m 2} or less, fineness 1.0Dtx～5.0Dtx, claim 1 or 2 disposable diaper according those of titanium oxide mixture ratio 5.0 wt% or less. The disposable diaper according to any one of claims 1 to 3, wherein the design includes a plurality of straight lines parallel to each other along a longitudinal direction of the diaper. The disposable diaper according to any one of claims 1 to 4, wherein the design includes a plurality of straight lines parallel to each other along a diaper width direction.

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