JPH0466697B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for transferring a transfer foil to a synthetic resin product and a device for transferring the transfer foil. The purpose is to

Synthetic resin products used for cosmetic container caps and the like are desired to have a high decorative effect, and transfer foil with a metallic feel is transferred or metal vapor-deposited onto the molded product.

Decorations using transfer foil and metal vapor deposition are now indispensable decorative means to make the appearance of products dazzling. However, compared to transfer foil, metal vapor deposition is inferior in uniformity and gloss, and vapor deposition The disadvantage is that the treatment process is complicated and time-consuming, as it is necessary to apply an undercoat treatment to the surface of the product beforehand.

On the other hand, with transfer foil, all you have to do is transfer the pre-formed foil to the specified location on the product, so it is easy to decorate the product surface, and the metallic appearance is uniform. The luster can also be set to a desired level, and a product with a good-looking metallic decoration can be obtained.

However, since transfer foil is composed of one continuous layer of foil, if the transfer surface of the product has unevenness or steps, the transferred foil may be deformed or shrunk. Sisters,
There was an inconvenience that cracks and wrinkles appeared on the decorated surface of the product.

As a conventional technology to solve this inconvenience,
There are techniques disclosed in Publication No. 57-41963, Publication No. 53-7843, and Publication No. 7843 of Special Publication.

This conventional technology relates to a technique for applying a transfer to a surface part of a product that has simple unevenness, and uses a transfer roll having the same cross-sectional shape of the peripheral surface as the cross-sectional shape of the transfer surface part of the product. Regardless of the height difference, the pressing force from the transfer roll is simultaneously applied to the product transfer surface portion with simple unevenness.

However, the entire area of the product transfer surface that can be transferred using the above-mentioned conventional technology must be completely exposed to the pressing direction of the transfer roll, and the surface perpendicular to the pressing direction of the transfer roll is largely inclined. If this angle of inclination is large, cracks and wrinkles will occur due to displacement of the transfer foil, making it impossible to obtain a good transfer.

In addition, in the above-mentioned conventional technology, since the surface portion of the transfer foil to be transferred is required to be exposed in the pressing direction of the transfer roll, for example, the transfer to the surface portion forming the stepped portion is not physically possible. There was a problem that it was impossible.

Therefore, the present invention has been devised to solve the problems in the prior art described above, and its technical problem is to achieve the transfer of a transfer layer onto the stepped surface portion of a synthetic resin product. The aim is to expand the range of synthetic resin products that can be decorated with transfer foil.

Means of the transfer foil transfer method of the present invention for solving the above-mentioned technical problem is to sequentially transfer the unit transfer portion of the transfer foil to the lower transfer surface, step surface, and upper transfer surface of the synthetic resin product while pressing in this order. Further, the means of the transfer foil transfer device of the present invention is such that the peripheral surface of the transfer roll serving as a transfer jig placed opposite to the product serves as a pressing surface for pressing the transfer foil onto the upper transfer surface of the product. In addition, the pressing surface is provided with a transfer flange having a protruding height larger than the height and width of the stepped portion.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cap 1 which is a synthetic resin product to which the method of the present invention is applied.
It has a structure in which a flange 3 is provided around the outer periphery of the lower end of a cylindrical main body 2, and a step 4 is formed at the boundary between the main body 2 and the flange 3.

A stepped portion 4 formed between the main body portion 2 and the collar portion 3
has a relatively large height and width, and the outer circumferential surface of the main body 2 near the step 4 is the lower transfer surface 2a, the outer circumferential surface of the collar 3 is the upper transfer surface 3a, and the outer circumferential surface of the step 4 is the upper transfer surface 3a. The front surface is a stepped surface 4a, and a continuous sheet of transfer foil 5 is transferred all around the lower transfer surface 2a, the stepped surface 4a, and the upper transfer surface 3a.

This transfer foil 5 has an upper transfer surface 3a, a step surface 4a,
The transfer to the lower transfer surface 2a is carried out using a transfer jig 6 on the cap 1, which is the product, in the same way as when transfer foil is transferred to a normal cylindrical product.
(see Fig. 2), position the transfer foil 5 between the cap 1 and the transfer jig 6, and transfer with the transfer jig 6 while rotating the cap 1 and the transfer jig 6 relative to each other. The foil 5 is pressed against the above-mentioned transfer surface of the cap 1.

The pressing of the transfer foil 5 onto the transfer surface by the transfer jig 6 transfers the unit transfer portion of the transfer foil 5 onto the lower transfer surface 2a of the main body 2, the step surface a of the step portion 4, and the upper portion of the flange 3. The transfer foil 5 is pressed on the transfer surface 3a in order, and the transfer foil 5 is transferred to the transfer surface of the cap 1 while maintaining this order.

The transfer jig 6 that presses and transfers the transfer foil 5 onto the cap 1 has a transfer roll structure made of an elastic material such as silicone rubber, and transfers the peripheral surface of the cap 1 via the transfer foil 5 to the top of the cap 1. A pressing surface 7 is configured to come into elastic contact with the transfer surface 3a, and a portion of the pressing surface 7 is provided with a transfer collar 8 projecting around its periphery.

The protrusion height of the transfer flange 8 is greater than the step 4 of the cap 1.
Specifically, the circumferential surface of the transfer collar 8 presses the transfer foil 5 against the lower transfer surface 2a, and transfers the transfer foil 5 onto the lower transfer surface 2a. When a sufficient pressing force is applied to the transfer foil 5 , the pressing force causes the transfer flange 8 to collapse and bulge laterally. The portion is pressed against the step surface 4a with a strength sufficient to achieve transfer, and the transfer collar 8 is in an elastically deformed state in which transfer is reliably achieved by this pressing.
The pressing surface 7 has a protruding height that allows elastic deformation to the extent that the transfer foil 5 can be pressed against the upper transfer surface 3a.

The lower transfer surface 2a and the upper transfer surface 3a, which are the transfer surfaces, are opposed to each other in a substantially perpendicular posture with respect to the pressing direction of the transfer jig 6, whereas the stepped surface 4a, which is a part of the transfer surface, Since the position is almost parallel to the pressing direction of the transfer jig 6,
Between the lower transfer surface 2a and the upper transfer surface 3a, there is a distance difference corresponding to the height and width of the stepped surface 4a along the pressing direction of the transfer jig 6.

Further, since the step surface 4a is in a posture almost parallel to the pressing direction of the transfer jig 6, the lower transfer surface 2a and the upper transfer surface 3a can be easily pressed by simply pressing the cap 1 of the transfer jig 6. It is difficult to simultaneously and equally receive the pressing force for achieving transfer.

Therefore, when the transfer jig 6 simultaneously presses the transfer foil 5 against the lower transfer surface 2 and the upper transfer surface 3a, the stepped surface 4
An incorrect tensile force is applied to the portion of the transfer foil 5 facing the step a, and the time when the pressing force is applied to the step surface 4a is delayed, resulting in cracks or wrinkles in the transfer of the step surface 4a. This will cause inconvenience.

In the case of the present invention, by first achieving the transfer of the lower transfer surface 2a, only the portion of the transfer foil 5 facing the lower transfer surface 2a is immovably fixed to the cap 1, and in this state, the stepped portion is Since the transfer to the surface 4a is achieved, the transfer foil 5 facing the step surface 4a
Unauthorized elongation deformation does not occur in the portion, and as a result, good transfer can be performed without creating cracks or wrinkles on the step surface 4a.

Further, since the pressing of the transfer foil 5 against the stepped surface 4a is achieved by the elastic deformation of the transfer collar 8 that bulges out to the side as a result of the pressing operation, a special There is no need to perform any operations on the transfer jig 6, and the cap 1 of the transfer jig 6
By a simple pressing operation, the desired pressing force is reliably applied to the step surface 4a parallel to the direction in which the pressing force is applied.

Since the present invention has the above-mentioned configuration, the step surface, which is in a posture substantially parallel to the direction of action of the pressing force that achieves the transfer of the transfer foil,
Since the transfer foil can be pressed without improperly deforming it, it is possible to successfully and reliably transfer the transfer onto the step surface, thereby making it possible to produce a good decorative effect using the transfer foil.
In addition, by utilizing the elastic deformation of the transfer base, the pressing force necessary for transfer to the stepped surface can be generated by a simple pressing operation of the transfer jig against the product. The transfer operation on the surface can be successfully achieved by a simple pressing operation as in the past, and the structure of the transfer jig is simple, with a transfer flange provided around the pressing surface. It has a simple structure, is easy to implement, and exhibits many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is an explanatory external view showing a row of products molded according to the present invention. FIG. 2 is an overall front view showing an example of the relative positional relationship between a product, a transfer foil, and a transfer jig when performing transfer according to the present invention. Explanation of symbols, 1...cap, 2...main unit,
3... Flange part, 4... Step part, 2a... Lower transfer surface,
3a...Upper transfer surface, 4a...Step surface, 5...Transfer foil, 6...Transfer jig, 7...Press surface, 8...Transfer flange.

Claims (1)

[Scope of Claims] 1. A transfer foil transfer method to a synthetic resin product, in which a continuous transfer foil is transferred to a synthetic resin product by pressure transfer via a transfer jig, wherein The transfer foil is arranged from the lower transfer surface to the upper transfer surface of a synthetic resin product provided with a transfer surface and a lower transfer surface, and the unit transfer portion of the transfer foil is attached to the lower transfer surface, the step surface, and the upper transfer surface. A method for transferring transfer foil to a synthetic resin product, which is characterized by sequentially transferring the transfer foil while pressing the transfer surface in that order. 2. For a synthetic resin product that has an upper transfer surface and a lower transfer surface via a stepped part, the peripheral surface of a transfer roll as a transfer jig that is placed opposite to each other with one continuous transfer foil sandwiched therebetween. , a pressing surface that comes into elastic contact with the upper transfer surface via a transfer foil, and a peripheral surface of a part of the pressing surface is elastically pressed against the lower transfer surface via the transfer foil, and elasticity due to the pressing is provided. A transfer foil transfer device comprising a transfer flange having a protruding height that can bulge out laterally due to deformation and press the transfer foil against a bullet surface.