JPH0478474B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a three-dimensional uneven pattern having a relatively wide area on a thermoplastic sheet material such as a vinyl chloride resin sheet material or synthetic leather, and This invention relates to a three-dimensional foil stamping method and high frequency foil stamping device using high frequency dielectric heating that can perform beautiful foil stamping on objects.

[Conventional technology]

Conventional foil stamping typically involves stamping relatively small areas such as letters on a flat surface.

As a method to make the processed surface of foil stamping appear three-dimensional,
There is one in which a part that has been foil-stamped on a flat surface is hollowed out using a mold of the same shape to form a groove, so that the foil is present on the bottom surface of the groove. Conversely, attempts have also been made to inflate the foil stamped area.

However, there has been no foil stamping on a wide surface where the width of the foil stamping part is more than 1 cm or even several centimeters, especially one in which the foil is attached to the entire surface of a protruding three-dimensionally complex shape.

[Problem to be solved by the invention]

Foil base paper for foil stamping is usually made by vapor-depositing metal on the surface of the film and coating the metal surface with a thermal adhesive, which is then pressure-transferred onto the surface of the material to be treated and then heated and bonded to remove it. It has a foil stamping process that is not used.

However, since the thickness of the metal layer of the foil base paper is very thin, about 3 microns, it is difficult to stamp the foil over a wide plane with an even force, and the foil tends to break. Even if it were possible to stamp foil onto a predetermined flat surface, applying three-dimensional unevenness to the foil stamping surface using conventional technology would change the surface area and cause the foil to peel off from the surface of the material being treated or break. Therefore, it is not possible to create a beautiful three-dimensional foil-stamped surface.

In view of these points, the present invention has devised a method and an apparatus for applying beautiful foil stamping to a relatively wide area and three-dimensional uneven surface of a sheet material made of vinyl chloride resin. It is.

[Means to solve the problem]

In the method according to the present invention, pressing is performed under heating conditions using high-frequency dielectric heating, and plastic processing of unevenness and foil stamping are performed simultaneously.

In this method, a pair of male and female molds 4 and 5 made of conductive material are used, which are carved into a desired three-dimensional shape by concavities and convexities. One of the male mold 4 and the female mold 5 is fixed to the upper electrode 7 of the high frequency dielectric heating device, and the other is fixed to the lower electrode 8. Treated material 1
shall be heated and pressed with the help of

At this time, when the pair of male mold 4 and female mold 5 are in the fitted state, a relatively large gap X is created in the outer part other than the shape-processed parts 4a and 5a where the desired shape of unevenness is engraved. .

The high-frequency foil stamping device that implements the above method has an upper electrode 7 that moves up and down relative to each other and is energized with a high-frequency current.
A male mold 4 is fixed to one side of the lower electrode 8 and a female mold 5 is fixed to the other, and a foil base paper 6 is fixed between the male mold 4 and the female mold 5.
and a sheet-like treated material 1 can be interposed therebetween.

[Effect]

When a high frequency current is applied with the foil base paper 6 and the material to be treated 1 sandwiched between the male mold 4 and the female mold 5, the male mold 4 and the female mold 5 act as electrodes, and the male mold 4 Since the concave and convex shapes of the female mold 5 and the female mold 5 are a pair, the material 1 to be treated between them is heated to an even temperature.

When a pressing force is applied in this state, the softened material 1 deforms along the mold, and
The base foil paper 6 is pressed against the uneven surface of the material 1 to be treated with an even force, and the metal layer is transferred as the foil 3.

When pressing the material to be treated 1 and the foil base paper 6 with the male die 4 and the female die 5, if the male die 4 and the female die 5 are pinched and pressed in a part other than the shape processing parts 4a and 5a,
The foil will also be transferred to that part. Also,
When the foil base paper and the material to be treated come into contact even without being pressed, the thermal adhesive on the surface of the foil base paper acts, and there is still a possibility that a portion of the foil base paper may be transferred.

However, in the present invention, since a relatively large gap X is formed outside the shape processing parts 4a and 5a, the material to be processed in this part does not reach a high temperature.
In addition, since the base foil paper does not adhere closely to the surface of the material to be treated, foil stamping is performed only on the surface of the desired uneven shape.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 2 and 3 show an example of foil stamping according to the present invention. A pattern 2 that is bulged and includes minute irregularities is applied to the surface of the material to be treated 1,
A foil 3 is attached to the surface of this pattern 2.

FIG. 1 is a cross-sectional view of a mold for foil stamping a design as shown in FIG. .

Both the male mold 4 and the female mold 5 are made of conductive material, and the male mold 4 has a shaped part 4a engraved with a pattern.
The female mold 5 is recessed and carved with a shaped part 5a corresponding to the shaped part of the male mold. Then, when the male mold 4 and the female mold 5 are fitted together, a relatively large gap X is created between the outer part 4b of the male mold and the outer part 5b of the female mold other than the shaped part. Make it. In order to create this gap X, the male shaped shaped part 4a is made to protrude larger than the recess of the female shaped shaped part 5a.

As a result of research by the present inventors, the gap X is approximately 2 mm or more, and when the foil base paper 6 and the material to be treated 1 are sandwiched between the male die 4 and the female die 5, they do not come into close contact with each other. It can be done like this.

The male mold 4 and the female mold 5 are fixed to either the upper electrode 7 or the lower electrode 8, and each acts as an electrode, so it would be normal to make them with a mold.
It may be of the known rubber-based conductive type material.

Figure 4 is a schematic diagram showing the process of foil stamping,
(B) Separate the male mold 4 and female mold 5, (B) interpose the foil base paper 6 and the material to be treated 1 between the male mold 4 and the female mold 5, and (c)
A high frequency current is passed between the male mold 4 and the female mold 5 to press them.

The embodiments described above are applied to a bulging pattern having an uneven pattern, but it can also be applied to a case where the positional relationship of the molds is reversed and a recessed surface having an uneven pattern is subjected to foil stamping.

FIG. 5 is a front view showing an example of a high-frequency foil stamping device, in which a female mold 5 is detachably attached to an upper electrode 7 that can be raised and lowered. A lower electrode 8 to which the male mold 4 is detachably attached is arranged below the upper electrode 7, and the entire lower electrode 8 is movable in the front and back direction in the drawing, and the material to be treated is set in front of the operating position. enable work.

A feed-out reel 9 and a take-up reel 10 for foil base paper are provided on both the left and right sides of the operating position of the electrode, and the foil base paper is held taut by guide members 11 and 11 between the male mold 4 and the female mold 5. The base paper is positioned so that a fixed size of foil base paper is wound up for each foil stamping operation.

In this way, if the foil stamping work is performed with the foil base paper taut, the foil base paper 6 will not sag, and the outer parts 4b of the male die 4 and the female die 5,
Even if the gap X in 5b is relatively small, it is possible to make it difficult for the material to be treated 1 and the foil base paper 6 to come into contact with each other.

〔Effect of the invention〕

According to the three-dimensional foil stamping method using high-frequency dielectric heating of the present invention as described in claim 1, the softened workpiece and the foil base paper are pressed with equal pressure, so that a wide and uneven three-dimensional surface can be stamped. , beautiful foil stamping can be done in one process without protruding from the uneven surface or breaking the foil.

According to the high frequency foil stamping apparatus according to the second aspect, the method according to the first aspect can be carried out efficiently.

[Brief explanation of drawings]

The attached drawings are for explaining the method and apparatus according to the present invention, and FIG. 1 is a longitudinal cross-sectional view of a mold for performing foil stamping, and FIG. 2 shows an example of a processed material. Front view, Figure 3 is - of Figure 2
Line sectional view, Figure 4 is a schematic diagram showing the foil stamping process,
FIG. 5 is a front view of the entire high frequency foil stamping device. 1... Material to be treated, 2... Pattern, 3... Foil, 4...
...Male type, 4a...Shape processing part, 4b...Outer part, 5...Female type, 5a...Shape processing part, 5b...
...outer part, 6... foil base paper, 7... upper electrode, 8...
... lower electrode, 9 ... feed-out reel, 10 ... take-up reel, 11 ... guide member.

Claims (1)

[Scope of Claims] 1. A pair of convex and concave three-dimensional shapes carved with a conductive material, and in a fitted state, a relatively large gap X is created in the outer part other than the shaped parts 4a and 5a. Using a male mold 4 and a female mold 5, one of the male mold 4 and female mold 5 is fixed to the upper electrode 7 and the other to the lower electrode 8, and between the male mold 4 and the female mold 5, a foil base paper 6 and a thermoplastic A three-dimensional foil stamping method using high-frequency dielectric heating, which is characterized in that a material to be processed 1, which is a sheet material, is pressed and plastic processing into a three-dimensional shape and foil stamping on the surface thereof are performed simultaneously. 2 A pair of male molds 4 and female molds having a three-dimensional uneven shape carved therein and made of a conductive material so as to create a relatively large gap X in the outer part other than the shape-processed parts 4a and 5a in the fitted state. Using the mold 5, the male mold 4 is fixed to one of the upper electrode 7 and the lower electrode 8 and the female mold 5 is fixed to the other of the upper electrode 7 and the lower electrode 8, which are raised and lowered relative to each other, and a high-frequency current is applied. A high-frequency foil stamping device characterized in that a foil base paper 6 and a sheet-like processed material 1 can be interposed.