JPS6058719B2 - Printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for printing an arbitrary pattern on an uneven object having a curved surface, grooves, or protrusions on its surface.

Conventionally, a method of printing a pattern on the surface of an object with unevenness is to print the pattern on a thin film, float the thin film on a liquid with the printed side facing up, and then press the object from above. A method is known in which the pattern is transferred to the surface of an object using the hydraulic pressure of a liquid, and then the thin film is removed from the surface of the object.

However, for this method, it is desirable for the thin film to have good swelling properties, i.e., expandability, like Obrado, and to have high flexibility and softening properties. Since the membrane is required to adhere tightly to uneven surfaces while being able to stretch and expand, when a thin membrane with such characteristics is floated on the water surface,
If a pattern printed on it is floated on the surface of water, the pattern printed on it will be significantly enlarged and deformed before being transferred, making it impossible to transfer the pattern as printed onto the surface of the object. Printing on complex irregularities is virtually impossible because the thin film prevents the printing pattern from being transferred to the finely irregular surface of the object. After the printed pattern is transferred, the thin film must be removed by physical or chemical means, which increases the number of steps. There were other drawbacks. The present invention aims to eliminate the above-mentioned drawbacks and provide a method for easily printing an arbitrary pattern on the surface of an uneven object having an arbitrary shape. The present invention will be explained in detail below with reference to the drawings. First, as shown in FIG. 1, the printing sheet for transfer used in the present invention is composed of a base sheet 1, a thin layer 2 made of a water-soluble resin, and a pattern layer 3. That is, a thin layer made of a water-soluble resin is provided on one side of the base sheet using a gravure coater, roll coater, knife coater, or other conventional coating method. This thin layer is formed so thin that it dissolves quickly by immersion in water and is completely removed from the pattern layer. Next, an arbitrary pattern layer is applied thereon using a gravure printing method, an offset printing method, or other conventionally known printing method.

The paint and printing ink used at this time can be arbitrarily selected as long as they are insoluble in water. The printed sheet constructed as described above is floated on the surface of water 4 with its printed side facing upward as shown in FIG. 2 below.

Then, the thin layer made of water-soluble resin is dissolved by immersion in water, and the base sheet is peeled off from the pattern layer and submerged in water. Next, as shown in Figure 3, a solvent is applied to the pattern layer remaining on the water surface to give adhesiveness to the paint or ink that makes up the pattern layer, or an adhesive is applied. By coating, an adhesive layer 5 is formed on the pattern layer.

Methods for applying solvents and adhesives include spraying,
Any method can be selected from among the flow coating method and other conventionally known coating methods. Next, as shown in FIG. 4, when the printing material 7 held by the holding mechanism 6 is pressed against the pattern layer floating on the water surface to cause part or all of it to sink into the water, the pattern layer is It adheres closely to the surface of the printing material.

Next, as shown in Figure 5, after the pattern layer has completely adhered to the surface of the printing material, the printing material is lifted out of the water, and the pattern layer is firmly adhered to the surface of the printing material due to the action of the adhesive layer. Therefore, any pattern can be printed on the uneven surface of the printing material without falling off. Next, each component of the present invention will be explained.

The base sheet is arbitrary as long as it is printable, and polyethylene sheets, polypropylene sheets, vinyl chloride sheets, polyester sheets, nylon sheets, and others can be used.

The thin layer consisting of a water-soluble resin is made of synthetic polymers such as sodium polyacrylate, polyvinyl alcohol, methylcellulose, carboxymethylcellulose, polyethylene oxide, polyvinylpyrrolidone, acrylamide, etc., and animal polymers such as Nikau, Vegetable polymers such as gelatin, chirotin, and polypeptide include starch, cellulose, dextrin, albumin, soy protein, gum arabic, gum tragacanth, and more! Also, the seaweed polymer is selected from among fleur-de-lis, agar, sodium alginate, etc., taking into consideration coater suitability, speed of dissolution by water, etc. Any paint or printing ink can be used as long as it is insoluble in water.

The pattern layer can be arbitrarily selected from various patterns such as letters, symbols, wood grain patterns, abstract patterns, and marble patterns.

Any solvent can be used as long as it imparts an adhesive to the paint or printing ink constituting the pattern layer.

Further, as the adhesive, any adhesive can be used as long as it has an adhesive between the printing material and the pattern layer. The printing materials are mainly three-dimensional objects made of wood, metal, plastic, or other molded materials that have uneven surfaces, but are of course not limited to these; It also includes three-dimensional objects or flat plates.

The holding mechanism is configured to allow all or part of the printing material to settle in water, and after settling, to collect the printing material by pulling it up, and then to replace the held printing material with a new printing material, The extent to which the substrate/print material is allowed to settle in water is sufficient as long as the surface of the substrate sinks in the water.

According to the method of the present invention as described above, the following effects can be obtained.

Since the printing pattern is transferred, not only multicolor patterns but also photographic patterns can be applied to the surface of the printing substrate, and the same pattern can be applied to a large number of printing substrates.

Since the base sheet is already separated when the printing material is pressed, the patterns do not overlap even if the surface is highly uneven. The base sheet does not dissolve in water, but separates from the pattern on the water surface and sinks to the bottom of the aquarium, so the time required for transfer is short, and the water is only slightly contaminated, so the pot life of the water is very long. long.

Since the pattern layer is adhered to the surface of the object with an adhesive, the pattern does not fall off.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of a printing sheet used in the present invention, Fig. 2 shows a state in which the printing sheet is floated on the water surface and the base sheet is separated, and Fig. 3 shows a state in which the printing sheet is floating on the water surface and the base sheet is separated. FIG. 4 shows a state in which the adhesive layer is provided, FIG. 4 shows a state in which the printing material is pressed, and FIG. 5 shows a state in which the printing material with a pattern layer adhered to its surface is lifted out of water. DESCRIPTION OF SYMBOLS 1... Base sheet, 2... Thin layer made of water-soluble resin, 3... Pattern layer, 4...
water, 5...adhesive layer, 6...holding mechanism,
7... Printing material.

Claims (1)

[Claims] 1. A printing sheet made by providing a thin layer of water-soluble resin on one side of a base sheet and applying an arbitrary pattern layer thereon using paint, printing ink, etc. is placed on the surface of the water with the pattern layer facing up. After the thin layer made of the water-soluble resin is dissolved in water and the base sheet is peeled off from the pattern layer, a solvent or adhesive is applied to the surface of the pattern layer remaining on the water surface, and then a solvent or adhesive is applied from above. 1. A printing method characterized by pressing a printing material to cause part or all of it to settle in water, and using the water pressure to transfer and adhere the pattern layer to the surface of the printing material.