JPH04261898A - Method for transferring unevenness - Google Patents

Abstract

PURPOSE:To rapidly, simply and accurately transfer unevenness. CONSTITUTION:A transfer method consists of a process wherein a resin film composed of an ultraviolet or electron beam curable resin is formed to the surface having unevenness of a transfer substrate 11, a process curing the resin film 2 by the irradiation with ultraviolet rays or electron beam and a process peeling off the cured resin film 2 from the transfer substrate 11.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring unevenness.

0002

[Background Art] In recent years, consumer preferences have become more complex and sophisticated.
People tend to want valuable, unique copies that are the only ones in the world, and if the master is expensive and took a long time to produce, using it continuously can be dangerous in the unlikely event of damage. We must consider this and take some measures. When such a master is relatively durable, such as one made of metal, a thermal transfer method is used. For example, a so-called thermal transfer method has been proposed in which a large number of small irregularities are engraved on a heating plate, the heating plate is pressed against a surface to be treated made of thermoplastic synthetic resin, and the surface is softened and engraved.

0003

[Problems to be Solved by the Invention] However, in this method, when the heating plate is released from the mold after heat engraving, the rate of temperature drop during curing varies locally, and the curing speed changes locally, resulting in distortion. It tends to have an uneven shape and has poor reproducibility. Moreover, with this method, it is not possible to completely soften the liquid.
It cannot be used for finely uneven shapes, and the surface to be treated cannot follow angular ridgelines such as those with triangular or square cross sections, which limits the range of application to the desired shape, and Not suitable for general processing. Furthermore, the use of a heating plate requires a high level of skill from the operator, making it unsuitable for mass production.

Particularly, when the substrate to be transferred is a unique historical, cultural, or evidential object, applying heat such as the above-mentioned heating may damage the substrate and cannot be applied. In such cases, epoxy resins and silicone rubbers are used, but these are made by mixing two liquids, and in order to completely cure the mixture, it is necessary to follow a prescribed work procedure to maintain the mixing ratio. It requires defoaming treatment of air mixed in with the process, and requires skill. Moreover, they take a long time to fully cure,
If it is a unique item, it will get in the way, and it is not suitable for large-scale transfer. In particular, when the transfer target substrate has weak mechanical strength, the rubber or the like flows during the time until it completely hardens, further impeding accurate transfer.

[0005] The present invention aims to provide a method for transferring unevenness that can eliminate such problems.

[0006]

[Means for Solving the Problems] The method of the present invention, as shown in the illustrated example, forms a resin film 2 made of ultraviolet or electron beam curable resin on the surface of a transfer target substrate 11 having irregularities 6 on the surface. A step of curing the resin film 2 with ultraviolet rays or electron beam irradiation, and a step of peeling the resin film 2 from the transfer target substrate 11 after the curing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. The illustrated example shows an example in which a decorative plate 12 having unevenness 7 that produces an iridescent pattern on its surface is obtained by the transfer method of the present invention.

In FIG. 1, a transparent ultraviolet curing resin,
For example, the resin film 2 is formed by coating or pouring an ultraviolet curable resin such as a photopolymerizable resin mainly composed of an acrylic oligomer having an acryloyl group in the molecule, and the resin film 2 is cured by irradiating ultraviolet rays. Of course, when electron beams are used in addition to ultraviolet rays as radiation, it is not necessary to specifically incorporate a photopolymerization initiator.

Thereafter, the resin film 2 is transferred to the substrate 11 to be transferred.
By peeling it off, a decorative board 12 having unevenness 7 is obtained. Of course, if the transfer target substrate 11 has good adhesion with the ultraviolet curable resin, it is sufficient to carry out a conventional peeling treatment before applying the ultraviolet curable resin.For example, as a peeling treatment agent, Silicone-based or Teflon-based mold release agents are common.

[0010] The unevenness 7 is formed in the form of a line, and the cross section of each protrusion is triangular, and the number of protrusions is approximately 30 per 1 mm.
The number should be approximately 0 to 500.

In the case of the decorative plate 12 having the unevenness 7 obtained in this way, when it is attached to the surface of a target product as shown in FIG. The colors change depending on the direction you look at, like the colors of a rainbow. This is due to the dispersion of light. In other words, the light rays are refracted and reflected by the unevenness 7, dividing the light into a spectrum of seven colors, similar to a multiprism, so that the light exiting the unevenness 7 appears as a rainbow of seven colors.

In the case of this embodiment, another colored plate or a colored patterned membrane plate may be interposed between the product surface and the decorative plate 12. Incidentally, in the case of this embodiment, since the uncured resin film 2 is directly irradiated with ultraviolet rays to cure the resin film 2, it does not matter whether the substrate 11 to be transferred is transparent or opaque.

In addition to the artificially carved parallel lines shown in the figure, the unevenness 6 may include polygonal pyramid-shaped or hemispherical unevenness arranged or misaligned, and other natural materials such as these. Even if it is uneven, it can be transferred in the same way.

[0014] In place of the ultraviolet curable resin, an electron beam curable resin may be used, and these are widely known and used. Further, the ultraviolet ray or electron beam curable resin may be semitransparent.

[0015]

According to the present invention, the irregularities 6 on the surface of the transfer target substrate 11 can be easily transferred in an extremely short time using ultraviolet rays or electron beam curable resin, and the transfer target substrate 11 can be easily transferred. Even if it is a unique object such as a natural product or an object that cannot be moved, it can be transferred on the spot without getting in the way, and even if it is a substrate 11 that easily flows, it can be accurately transferred by instant curing. Further, since no heat is required to cure the resin film 2, it is possible to use the transfer target substrate 11 for which heating is not appropriate, and it is possible to prevent damage, deformation, and abrasion of unique objects.

In particular, in the transfer method of the present invention, an uncured ultraviolet or electron beam curable resin film 2 is formed on the surface of the substrate 11 to be transferred having unevenness 6, and this is irradiated with ultraviolet rays or electron beams. Since the unevenness 6 is transferred and hardened to the resin film 2, even the minute unevenness 7 of the target shape can be accurately transferred, resulting in excellent reproducibility. In particular, if the resin film 2 is made into a transparent film, the unevenness 6 can be used as it is as a normal image without undergoing reversal processing. Furthermore, the method of the present invention has the advantage that the apparatus can be made smaller, is relatively simple, requires only a small area of equipment, and has low equipment costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a concavo-convex transfer state.

FIG. 2 is a perspective view of a decorative plate obtained by concavo-convex transfer wrapped around the surface of an electric shaver.

[Explanation of symbols]

2 Resin film 6. Irregularities on the transfer target substrate 7. Irregularities on the decorative board 11 Transfer target substrate 12 Decorative board

Claims (1)

[Claims] [Claim 1] Transfer target substrate 1 having unevenness 6 on the surface.
A step of forming a resin film 2 made of an ultraviolet ray or electron beam curable resin on the surface of the substrate 1 , a step of curing the resin film 2 with ultraviolet ray or electron beam irradiation, and after curing the resin film 2 on the transfer target substrate 11 . A method for transferring unevenness, the method comprising the step of peeling off the surface.