JPS63302006A - Molding die - Google Patents

Abstract

PURPOSE:To manufacture a molding die simply by removing an uncured section after placing a negative film on a photosensitive resin layer on a base and effecting photo-irradiation process. CONSTITUTION:A photosensitive resin layer 3 is, if necessary, bonded and provided on a plane sheet-shaped base 1 constituted of deflectable sheet such as steel, polyester film or the like through a halation prevention layer. A negative film 4 having patterns of desired design and the like is placed on said photosensitive layer 3, and a light such as ultraviolet rays or the like is irradiated on the negative film 4 for 1-10 minutes by an ultraviolet lamp 5. As a result, the irradiated portion of the photosensitive resin layer 3 is cured to form a photocured section, while an uncured section 7 is formed by the portion which has not been irradiated. The uncured section 7 is removed by dissolving and washing with water, alcohol or the like and exposed to the light of the ultraviolet rays again for 1-10 minutes after being dried and heat treated to manufacture a carved seal plate 8 with recessed and projected patterns.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a molding product used for imprinting designs, characters, etc. on the surface of articles made of rubber or plastic (thermoplastic resin, thermosetting resin). Regarding molds.

[Prior art]

Conventionally, it is made of rubber, thermoplastic resin, thermosetting resin, thermoplastic elastomer, etc. In order to engrave a pattern on the surface of an article, a mold with a pattern engraved on the inner surface or a metal plate with a pattern engraved on the surface attached to the inner surface has been used during molding.

However, in order to engrave a pattern on the inner surface of a mold or the surface of a metal plate, methods such as cutting, casting, and chemical etching must be used, resulting in the problem that the processing process is complicated, time consuming, and costly. There is. Furthermore, in the case of chemical etching, there is also the problem of disposing of strong acid waste liquid, which is not preferable from the point of view of safety. Furthermore, with these methods, it is substantially difficult to fabricate a mold that requires microfabrication such as holes in which unevenness on the order of microns is carved into the surface of the molded product.

[Purpose of the invention]

An object of the present invention is to provide a molding die that can be used extremely simply and inexpensively, and that is also capable of stamping micron-order irregularities on the surface of a molded product.

[Structure of the invention]

For this reason, the present invention provides a photosensitive boiled fat layer on the base material,
After placing a negative film on this resin layer and irradiating the negative film with light to partially cure the resin layer,
The gist of the invention is gold green for molding, which is obtained by removing the unhardened parts.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

FIGS. 1(A), (B), (C), and (D) are explanatory diagrams showing an example of the manufacturing process of the molding die of the present invention.

In FIG. 1(A), a flat base material 1 made of a metal plate such as steel or aluminum or a flexible sheet such as a polyester film or a nylon film is coated with an adhesive/halation prevention layer as necessary. 2, photosensitive resin layer 3
Place. This photosensitive resin layer 3 is of a photopolymerizable type and/or
Alternatively, it is a photocrosslinking type, which is a layer made of a resin that undergoes a polymerization reaction or a crosslinking reaction and hardens when exposed to light such as ultraviolet rays. Examples of this resin include mixtures of vinyl polymers such as acrylamide and acrylate with saturated polymers such as methyl methacrylate, methacrylic acid, borihinyl alcohol, and copolyamide, and vinyl monomers such as styrene/triethylene glycol diacrylate. and unsaturated polyesters, and vinyl polymers. This resin is available in liquid form and solid form, but it is preferable to use solid form. Examples of solid photosensitive resins include copolyamide-based and polyvinyl alcohol-based resins.

In addition, this resin has heat resistance that can withstand thermal deformation, and from the viewpoint of molding into articles made of rubber or plastic, it also has a heat resistance that does not deform due to the fluidity of rubber or plastic during molding. Hardness is required after curing, and for this reason, it is preferable that the hardness after curing is 50° or more in Shore D hardness. Photosensitive resin layer 3
The thickness may be arbitrarily determined depending on the relief thickness of the desired design, etc.

Next, as shown in FIG. 1(B), a negative film (black and white film) 4 with a pattern such as a desired design is placed on the photosensitive resin layer 3, and as shown in FIG. 1(C), The negative film 4 is irradiated with light such as ultraviolet light for 1 to 10 minutes using an ultraviolet lamp 5. As a result, the portion of the photosensitive resin layer 3 that is exposed to light is cured and becomes a photocured portion 6, while the portion that is not exposed to light becomes an uncured portion 7.

The uncured part 7 is removed by dissolving and washing with water or alcohol, and after dry heat treatment (for example, heating at 130°C for 15 minutes), it is re-exposed to light such as ultraviolet rays for 1 to 10 minutes.
A concavo-convex stamp plate 8 shown in FIG. 1(D), that is, a mold for molding is obtained.

Using this uneven stamp plate 8, tires, conveyor helds, etc.
Rubber or plastic products such as rubber products such as rubber shoes, leather sheets, punches, plastic products such as containers, etc.
For example, articles made of thermoplastic resins such as vinyl chloride resin, nylon resin, acrylic resin, polyethylene, polypropylene, ABS resin, and polyurethane, and thermosetting resins such as epoxy resin, phenolic resin, unsaturated polyester resin, and melamine resin. In order to engrave a pattern such as a design on the surface, for example, as shown in FIG. (e.g. 150℃,
30 years old, flat plate press vulcanization at a pressure of 20 kg/cnl)
. As a result, the molded product 10 made of plastic as shown in FIG.
It is possible to obtain an article with a pattern such as In, etc. engraved on it.

can. In addition, the uneven stamp plate 8 is pasted on the inner surface of a forming mold or on the surface of a forming roll, and articles made of unvulcanized rubber or plastic are made using these molds or i-rolls. It may also be done by vulcanization. In order to improve the releasability between the embossed plate 8 and the article made of rubber or plastic, a soricone-based mold release agent is thinly applied to the surface of the embossed plate 8, or a release agent is added to the photosensitive resin. may be mixed.

Since the concavo-convex stamp plate 8 is used in this manner, it is preferable that the base material I has a low thermal shrinkage rate and good heat resistance. Moreover, since the concavo-convex stamp plate 8 is often used by being attached to a mold, it is preferable that the base material 1 has flexibility so that it can easily follow the shape of the mold. Furthermore, the thinner the base material 1 is, the more preferable it is. This is because if the thickness is too large, the depressions on the surface of the molded product will become large during thermoforming, and the thickness of the molded product will become too thin at that part, which may cause problems in the durability of the molded product. For this reason, it is preferable that the thickness of the base material 1 is 1 mm or less.

Alternatively, the base material I may be the inner surface of the mold itself. In this case, a photosensitive resin layer 3 is provided on the inner surface of the mold itself, a negative film 4 is placed on top of it, and light is irradiated onto it to remove the uncured portion 7 and form an uneven surface. As described above, there is no need to attach the concavo-convex stamp plate 8 to the inner surface of the mold.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need to go through complicated processing processes such as chemically etching a metal plate or carving the inner surface of a metal mold by cutting, casting, chemical etching, etc. as in the past. A mold for molding can be easily obtained by simply irradiating with light.

In addition, according to the present invention, since unevenness is formed on the surface of the base material by light irradiation using a negative film, it is possible to form minute unevenness, so it is possible to create photorealistic designs that require microfabrication, which was substantially difficult in the past. For example, it becomes possible to imprint a design, such as a photograph of a face, on the surface of an article made of rubber or plastic.

[Brief explanation of drawings]

Figures 1 (A), (B), (C), and (D) are explanatory diagrams showing an example of the manufacturing process of the molding die of the present invention, and Figure 2 (A) is the molding die of the present invention. FIG. 2(B) is an explanatory view showing an example of stamping a pattern on the surface of an article made of rubber or plastic using the method, and FIG. 2(B) is an explanatory view showing a molded product obtained thereby. ■... Base material, 2... Adhesive/antihalation layer, 3
... Photosensitive resin layer, 4... Negative film, 5...
UV lamp, 6... light-cured part, 7... uncured part,
8... Concave and convex stamp plate, 10... Molded product.

Claims (1)

[Claims] A photosensitive resin layer is provided on the base material, a negative film is placed on this resin layer, the negative film is irradiated with light to partially cure the resin layer, and then the uncured portion is removed. A mold for molding.