JPH0340272Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a disposable diaper, and more specifically to a disposable diaper that can be easily recognized from the outside when wet after being worn.

(Prior Art) Recently, disposable diapers have come into use because of their ease of carrying, convenience, and good absorbency.

However, conventional disposable diapers cannot be recognized from the outside even when wet, so they are often left wet for a long time, and when they are removed and checked each time, the adhesive strength of the adhesive tape attached to both sides of the disposable diaper decreases. Alternatively, the adhesive force was so strong that the soft resin film on the outer surface of the disposable diaper was broken, making it difficult to wear it again.

In order to solve these problems, the inventor
By providing a printing layer containing a water-soluble resin as a binder and a highly hygienic coloring agent on the inside of the soft resin film on the outer surface of the paper diaper or on the surface of the paper diaper, the printing layer becomes more stable when wet. Invented a paper diaper that can be identified by bleeding (Akira Jitsukai)
58-184505), although this invention makes identification extremely easy, there is a problem in that the eluted printing ink may spread into the inside of the disposable diaper, giving it an unsanitary appearance.

(Problems to be solved by the invention) The present invention uses a water-insoluble resin layer that becomes transparent or translucent when wet with water and is opaque when dry, and provides a disposable diaper that does not have the above-mentioned problems. be.

[Structure of the idea]

(Means to solve the problem) The present invention will be explained based on the drawings.

FIG. 1 is a partially enlarged view showing an embodiment of the present invention.

In FIG. 1, a water-insoluble resin layer 2 that becomes transparent or translucent when wet and opaque when dry is provided on the entire or partial inside of a transparent or translucent soft resin film 1 on the outer surface of the disposable diaper. A colored ink layer 3 which is water-insoluble when dried is further provided on the water-insoluble resin layer.

The water-insoluble resin layer 2, which is transparent or translucent when wet and opaque when dry, used in the present invention may be of any type, such as nitrocellulose, cellulose acetate, ethyl cellulose, cellulose acetate butyrate. It can be obtained by whitening cellulose resins such as. In this case, whitening methods include mixing water with the printing solvent, mixing a fast-drying polar solvent with an ester solvent,
Alternatively, there is a method of humidifying the printing surface, or a method of using these methods in combination.

Any colored ink that is water-insoluble after drying may be used; for example, water-based ink is suitable. Vehicles for such water-based inks include, for example, water-soluble resins such as styrene-acrylic resins, styrene-maleic resins, styrene resins, acrylic resins, vinyl acetate resins, styrene-butadiene resins, and alkyd resins. Although there are water-dispersible resins such as resins and epoxy resins, styrene-acrylic water-dispersible resins are preferred because they have good film-forming properties, relatively quick drying properties, and good adhesion to the soft resin film 1. Further, the colorant for such colored ink may be any water-insoluble colorant, and is preferably selected from organic pigments and inorganic pigments, but is preferably one that is harmless even if it comes into direct contact with the skin. In order to improve the water permeability of the colored ink layer, extender pigments such as barium sulfate, calcium carbonate, kaolin, and silica can be added. It is preferable to use

The water-insoluble resin layer 2 and the colored ink layer 3 may be provided by either printing or coating.
For example, methods such as gravure printing and flexographic printing can be used.

(Function) In the paper diaper of the present invention, the water-insoluble resin layer 2, which is opaque when dry, becomes transparent or translucent by getting wet, and the color of the underlying colored ink layer 3 becomes visible. When wetting is low or dry, the water-insoluble resin layer 2 remains opaque, allowing continued use, and is stable without any change in color until a certain amount of wetting is achieved.

〔Effect of the invention〕

The following effects were confirmed by this invention.

1 Wetness can be easily and quickly identified.

2. Wetness can be detected without removing the diaper.

3 Stable with no color change until a certain amount of wetness is reached.

4 There is no bleeding in the pattern and it looks beautiful.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of the present invention. 1...Transparent or translucent soft resin film,
2... A water-insoluble resin layer that becomes transparent or translucent when wet with water and is opaque when dry; 3... A colored ink layer that is water-insoluble after drying.

Claims (1)

[Scope of utility model registration request] In a paper diaper that has a transparent or translucent soft resin film on the outer surface, the entire or partial inside of the film is made of a water-insoluble resin that does not contain a colorant and is transparent or translucent when wet and is opaque when dry. 1. A paper diaper comprising: a layer, and a colored ink layer which is water-insoluble after drying and which uses a water-insoluble coloring agent as a coloring agent and is further provided on the resin layer.