JP4024685B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable diaper intended for infants, incontinent persons, and the like, and more particularly to an improvement of a front target tape in a flat type disposable diaper.
[0002]
[Prior art]
Disposable diapers are roughly classified into flat types and pants types. A flat disposable diaper is a structure in which an absorbent body is interposed between an outer sheet made of a liquid-impermeable sheet and an inner sheet made of a liquid-permeable sheet. From the front waist part through the crotch part to the rear waist part A front side flap and a rear side flap that are formed in a vertically long shape and extend outward on both sides are provided at the front waist portion and the rear waist portion, respectively. A fastening tape is provided on the rear side flap, and a front target tape is provided on the front waist, and the rear waist is applied to the back of the wearer and the front waist is applied to the abdomen. The disposable diaper is attached by fastening the flap fastening tape to the front target tape at the front waist.
[0003]
In the flat type disposable diaper, a surface fastener is generally applied to the fastening tape and the front target tape. A hook tape in which a large number of micro hooks are dispersed is fixed to the fastening tape, and the front target tape is a micro hook. As a loop tape in which a large number of micro loops engaged with each other are dispersedly formed, a tape made of a nonwoven fabric is used (for example, see Patent Document 1).
[0004]
In addition, the front target tape has a scale that is designed to display the fastening position of the fastening tape at a glance according to the size of the wearer's waist so that it can be worn in a short time. Various designs are printed to give a good impression.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-70340
[Problems to be solved by the invention]
By the way, as shown in FIG. 4A, when the ink layer 32 is printed on the surface of the base tape 31 of the front target tape 30 to form the above pattern, the attachment and detachment of the fastening tape is repeated. The ink layer 32 is scraped off by a small hook of the hook tape and peeled off from the base tape 31, and the pattern disappears dirty and the appearance deteriorates.
[0007]
Then, as shown in FIG.4 (b), although the ink layer 32 was printed and formed on the back surface of the base tape 31, it was thought that the pattern seen from the surface of the front target tape 30 became unclear. There is a problem in that the effect of forming is significantly reduced and the added value on the product is lost.
[0008]
In view of the above-described conventional problems, an object of the present invention is to provide a disposable diaper having a clear print on the front target tape and high durability against repeated fastening operations.
[0009]
[Means for Solving the Problems]
The disposable diaper of the present invention has a vertically long shape extending from the front waist part through the crotch part to the rear waist part, and has a front side flap and a rear side flap respectively extending outward on both sides to the front waist part and the rear waist part. In a disposable diaper with a fastening tape on the rear side flap and a front target tape on the front waist, the front target tape is coated with a printed layer that forms a pattern on the surface of the base tape and the printed layer. The base tape is composed of a polyethylene terephthalate resin (PET) fiber and a polyethylene resin (PE) layer is formed on the outer periphery thereof. It consists of a non-woven fabric composed of 8 denier PE / PET fibers and is corona discharge treated before printing. .
[0010]
According to this configuration, since the printing is performed on the surface of the base tape, a clear pattern can be formed on the surface of the front target tape, and the overcoat layer covering the printing layer is provided. Even if the attaching tape is repeatedly attached and detached, the printed ink can be prevented from peeling off and the pattern can be reliably prevented from disappearing dirty, and a good-looking disposable diaper can be provided even after repeated attachment and detachment.
[0011]
In addition, the base tape is a non-woven fabric composed of 1.5 to 8 denier PE / PET fibers having a core portion made of polyethylene terephthalate resin (PET) fibers and a polyethylene resin (PE) layer formed on the outer periphery thereof. Because it is made of corona discharge before printing, it is possible to improve the ink fixability by imparting irregularities to the fiber surface by corona discharge while using an inexpensive base tape made of nonwoven fabric. A pattern that is hard to disappear can be formed.
[0012]
Further, when the overcoat layer is formed by applying varnish, a coating layer having high strength can be formed by a simple process without impairing the sharpness of the pattern.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the disposable diaper of the present invention will be described with reference to FIGS. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0014]
1 and 2 show the overall configuration of a flat disposable diaper 1. This disposable diaper 1 has a configuration in which an absorbent body 4 (see FIG. 3) is interposed between a liquid-impermeable outer sheet 2 and a liquid-permeable inner sheet 3, and a crotch part 6 is formed from the front waist part 5. After that, it is formed in a vertically long shape that reaches the rear waist portion 7. As shown in FIG. 3, the outer sheet 2 is formed by laminating a back sheet 17 made of a thin non-woven fabric or the like for giving a cloth-like feel to the outer surface of a waterproof sheet 16 made of a liquid-impermeable polyethylene sheet or the like. The inner sheet 3 is composed of a nonwoven fabric.
[0015]
Between the front waist portion 5 and the rear waist portion 7, an elastic elastic member such as rubber thread is disposed in an extended state on both sides of the absorbent body 4, and is joined to the sheets 2 and 3 to join the three-dimensional gather portion 8 and A gathered outer edge portion 9 is formed, and the front waist portion 5 and the rear waist portion 7 are adapted to fit the waist by joining tape-like elastic elastic members made of foamed polyurethane or the like to the gathered sheets 2 and 3. It is configured. The front waist portion 5 and the rear waist portion 7 are respectively provided with a front side flap 11 and a rear side flap 12 that extend outward on both sides.
[0016]
The rear side flap 12 is provided with a fastening tape 13, and the front waist portion 5 is provided with a front target tape 14 that serves as a fastening surface of the fastening tape 13. The front target tape 14 has a designed mark that displays the fastening position of the fastening tape at a glance according to the size of the wearer's waist, and various designs for giving a good impression to infants A pattern 15 such as is printed.
[0017]
When this disposable diaper 1 is worn, the back waist 7 is applied to the wearer's back and the front waist 5 is applied to the abdomen, and the fastening tape is used according to the wearer's physique and body shape, using the pattern 15 as a guide 13 is fixed, and is fixed to the front target tape 14 as shown in FIG. A leg opening is formed by the fastening of the fastening tape 13, the crotch portion of the wearer is wrapped by the outer edge portion 9, and the three-dimensional gather portion 8 is positioned inside thereof to prevent urine leakage.
[0018]
In the disposable diaper 1 having such an overall configuration, as shown in FIG. 3, the fastening tape 13 has a large number of micro hooks 19 a at the tip of the surface facing the front target tape 14 of the connecting tape 18 made of nonwoven fabric. The hook tape 19 formed in a distributed manner is fixedly configured. Further, as shown in FIG. 3, the front target tape 14 is provided with a printing layer 21 that forms a pattern 15 on the surface of a base tape 20 made of a nonwoven fabric, and a transparent resin that covers the printing layer 21 on the printing layer 21. An overcoat layer 22 is provided.
[0019]
The base tape 20 is a non-woven fabric configured so as to have an air through of 30 to 60 g / m ² using 1.5 to 8 denier PE / PET fibers having a core PET and a PE layer formed on the outer periphery thereof. It is composed of a tape and further subjected to corona discharge treatment before printing. The back side of the base tape 20 is fixed to the back sheet 17 of the outer sheet 2 by heat welding.
[0020]
The printing layer 21 constituting the pattern 15 is formed by printing with a water-insoluble ink containing an inorganic pigment or an organic pigment. As inorganic pigments, titanium dioxide, alumina white, zinc sulfide, bitumen, precipitated barium sulfate, precipitated calcium carbonate, hydrous silicate, manganese violet, aluminum powder, carbon black, etc. are preferably used, and as organic pigments , Naphthol Green B, Naphthol Yellow S, Risor Red, Fast Yellow, Chromothal Yellow, Chromothal Red, Peacock Blue Lake, Alkaline Blue Lake, Rhodamine Lake, Phthalocyanine Blue, Anthraciridine Yellow, Kinacaridon Red, Di Oxazine violet, isoindolinone yellow, daylight fluorescent pigment, and the like are preferably used.
[0021]
The overcoat layer 22 is formed by dissolving a resin material in a solvent, and a varnish that forms a transparent hard surface coating layer when applied is preferably used. For example, Toyo Ink Mfg. Co., Ltd. has a composition of 10-25% synthetic resin, 10-20% propyl acetate as solvent, 20-30% normal propyl alcohol, and 5-10% methylpropylene glycol. “FB King X” or the like is preferably used.
[0022]
According to the above configuration, in the front target tape 14 of the flat-type disposable diaper 1, the base tape 20 is made of non-woven fabric and subjected to corona discharge treatment before printing. While using the material tape 20, it is possible to improve the ink fixability by imparting irregularities to the fiber surface by corona discharge, and it is possible to form a clear and hard-to-disappear pattern.
[0023]
Since the printed layer 21 is formed on the surface of the base tape 20, a clear pattern 15 can be drawn on the surface of the front target tape 14, and the printed layer 21 is covered with the overcoat layer 22. Therefore, even if the hook tape 19 of the fastening tape 13 is repeatedly attached and detached, it is possible to prevent the printed ink from peeling off. In addition, since the overcoat layer 22 is formed by coating varnish, a high-strength coating layer can be formed in a simple process without impairing the sharpness of the pattern 15.
[0024]
Therefore, according to the present embodiment, it is possible to reliably prevent the pattern 15 from being dirty and disappear, and it is possible to provide the disposable diaper 1 having a good appearance even when repeatedly attached and detached.
[0025]
【The invention's effect】
According to the disposable diaper of the present invention, the front target tape is configured by providing a printed layer that forms a pattern on the surface of the base tape and an overcoat layer made of a transparent resin that covers the printed layer. The material tape consists of a non-woven fabric composed of 1.5-8 denier PE / PET fibers with a core part made of polyethylene terephthalate resin (PET) fibers and a polyethylene resin (PE) layer formed on the outer periphery thereof, Since corona discharge treatment is performed before printing, it is possible to form a clear pattern on the surface of the front target tape, and prevent the printed ink from peeling off even if the fastening tape is repeatedly attached and detached, It is possible to reliably prevent the pattern from being dirty and disappear, and it is possible to provide a disposable diaper that looks good even when repeatedly attached and detached.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of an embodiment of a disposable diaper of the present invention.
FIG. 2 is a front view of the disposable diaper of the embodiment.
FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG. 2;
4A and 4B show a front target tape in a disposable diaper of a conventional example, in which FIG. 4A is a sectional view of an example in which a printed layer is formed on the surface side, and FIG. 4B is a sectional view of an example in which the printed layer is formed on the surface side. is there.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 5 Front waist part 6 Crotch part 7 Rear waist part 11 Front side flap 12 Rear side flap 13 Fastening tape 14 Front target tape 15 Pattern 20 Base material tape 21 Print layer 22 Overcoat layer

Claims (3)

It has a vertically long shape that extends from the front waist to the crotch and extends to the rear waist, and has a front side flap and a rear side flap that extend outward on both sides of the front waist and the rear waist, respectively. In disposable diapers with a front target tape on the front waist,
The front target tape is configured by providing a printed layer that forms a pattern on the surface of the base tape and an overcoat layer made of a transparent resin that covers the printed layer ,
The base tape is made of a non-woven fabric composed of 1.5 to 8 denier PE / PET fibers having a core portion made of polyethylene terephthalate resin (PET) fibers and a polyethylene resin (PE) layer formed on the outer periphery thereof. A disposable diaper characterized by being subjected to corona discharge treatment before printing . The disposable diaper according to claim 1 , wherein the back side of the base tape is fixed to the outer sheet by heat welding .   The disposable diaper according to claim 1 or 2, wherein the overcoat layer is formed by applying a varnish.

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