JPS61262200A - Method of transferring transfer foil - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for transferring a transfer foil even to the surface of an article having a cubic curved surface.

[Prior art and its problems]

Traditionally, transfer foil was transferred using a flat silicone rubber or silicone roll.
These methods could only transfer onto a quadratic curved surface such as the surface of a cylindrical article.

Therefore, in recent years, a method has been adopted in which the pad used in the above-mentioned pad printing method is heated and transferred onto a three-dimensional curved surface by hot stamping.

However, in order to heat a pad made of silicone rubber or urethane rubber with this method, the pad must be attached by heating the stand and then heating the pad from the front through conduction of the heat, or by heating the pad from the front side by heating the pad from the front through conduction of the heat. Install a heater and apply the heat radiated from it to the pad.
Previously, a method of heating the pad indirectly was adopted, but pads are generally conical in shape, and the tip is used for transfer, so heating the pad from the back was used. However, due to the poor thermal conductivity of the pad, it took a very long time to heat the tip to the required temperature, and during that time there was also heat dissipation, making it almost impossible to achieve satisfactory heating.

There is also a method of heating the pad by irradiating heat rays from around it.
Since pad printing requires moving the pad up and down, it is mechanically difficult to install the heat source close to each other.

Therefore, in the existing roll transfer machines used for hot stamping, the heat source is installed close to the roll, but this is possible because the roll rotates, moves up and down, and does not have a conical pad. If an attempt is made to heat the tip, it is necessary to irradiate it with an infrared lamp or the like from a considerable distance, which is extremely inefficient, and in practice it is difficult to heat the pad to the required temperature.

As mentioned above, it was expected that it would be possible to transfer a cubic surface by using a thermal pad in the transfer machine, but trying to heat the tip of the pad would require a complicated mechanism, and there was no effective heating method. Currently, it has not been put into practical use because there was no such thing.

[Purpose of the invention]

The present invention aims to rectify the drawbacks of soft soil, and its purpose is to easily and quickly transfer the transfer foil onto a three-dimensional curved surface by heating the pad easily and quickly. To provide a method for transferring a transfer foil that can be obtained and performed at low cost.

[Embodiments of the invention]

As the pad used in the present invention, a pad generally used in pad printing can be used as is. Pad printing uses a pad made of a gelatin-glycerin mixture, silicone rubber, or urethane rubber. Moreover, many shapes are made depending on the shape of the transferred article and the type of printing plate, and these shapes are also used in the present invention. However, in the present invention, the tips of these pads are heated before use.

By the way, these pads have very poor thermal conductivity.

Now, for the test, I made a 20 mm square silicone rubber pad, placed it on a hot plate with a built-in heater heated to 200°C, and after 2 hours, the top surface of the reflective side that was not in contact with the hot plate. When the temperature was measured, it was 150°C. After another 2 hours, the temperature was measured again and the temperature was 165°C. This is thought to be due to the fact that more heat is radiated due to the poor thermal conductivity of silicone rubber. However, when this pad was removed from the hot plate and the temperature on the side that had been in contact with the hot plate was measured, it was found that it was almost 200°C, and even after 2 minutes had passed, the temperature remained above 180°C. The present invention takes advantage of this fact.

In general, the shape of the pad is close to a conical shape, and the height of the cone is often 50 mm or more.When printing bands, the pad is compressed under pressure and is A range of up to about 1/200% is used. If we tried to heat the conical pad from the back side of the bottom side, it would require long heating time as in the experiment above, and it would be practically impossible to achieve high temperatures. There is a large temperature difference in the body, making uniform thermal transfer impossible. Therefore, in the present invention, the tip of the conical pad is brought into contact with the heating body to heat it, and during this heating, the pad is strongly pressed against the heating body to the extent that the pad is actually used, compressing it and heating it. Therefore, the area necessary for use of the pad can be heated to a substantially uniform temperature.

Although the heating element used in the present invention may have any shape, it is generally a plate-shaped heater wrapped in an iron plate. However, more uniform heating can be achieved by using a heating element having the same shape as the object to be transferred. When transferring to a circular object,
Contact heating may be applied to the head of a circular thermal bulb. In special cases, the tip of the pad can also be heated by submerging it in a heated liquid. As the liquid, oils, glycerin, silicone oil, etc. may be used.

The present invention is a method of using a heating pad as a hot plate for hot stamping. Therefore, the heating pad is 100-200℃
Since it is necessary to heat the pad to
Glycerin mixtures are not suitable for high temperature heating. In this respect, silicone rubber can be used repeatedly without undergoing any change even if it is heated in contact up to about 250°C. In order to heat the pad, the higher the temperature of the heating element it is in contact with, the faster it can be heated, but if the temperature of the heating element is set too high, the temperature of the band will gradually rise during use, and it will eventually reach the necessary limit temperature. It is preferable to keep the temperature of the heating element within the necessary limit temperature, since the temperature of the heating element becomes high when the temperature exceeds .

In addition, once the pad is heated to the required temperature, it has a relatively heat-retaining ability, so even if the pad is removed from the heating element, it will maintain the required temperature for 1 to 2 minutes. The pad then loses heat and cools down, but in many cases the required temperature can be restored by returning it to the heating element and reheating it for 2 to 30 seconds.

However, since the present invention is a method of hot stamping using a heating pad, it is necessary to avoid losing heat from the pad as much as possible, so it is preferable to heat the object to be transferred in advance, and to heat the band from the back. It is also effective to use a method of heating from a distance with an infrared lamp.

As described above, in the present invention, the tip of the pad is heated by contacting the heating element, but in carrying out the present invention, a hot stamping machine with such a mechanism can be manufactured extremely easily. Printing machines generally have two departments, a printing department and a printing department, and many pads have a mechanism that moves them back and forth between these two departments. Therefore, we removed the plate-like halftone plate in the printing department, installed a flat heating plate, placed the transferred material in the printing department, placed hot stamping foil on top of the transferred material, and operated the machine. This makes it possible to immediately hot stamp a cubic surface.

In addition, with pad printing machines, you can freely adjust the time the pad is in contact with the plate and the printing time, and one cycle is 1 to 3 times.
Most of the time is within 0 seconds, so in many cases, it can be used as is for the hot stamp of the present invention.

This will be shown below using a specific example.

Specific Example 1 A flat heating plate with a built-in heater was placed in the plate section of a T-20 band printing machine manufactured by Taihei Kogyo Co., Ltd., and connected to a temperature controller to set the temperature at 180°C.

The pad is made of silicone rubber and has a substantially flat conical diameter with a bottom diameter of 60 mm and a height of 50 mm.

A golf ball is placed in the printing department, and Murata Kinpaku No. 5 gold hot stamping foil is placed on top of it.Then, the band is passed to the printing department and the pad is pressed down and compressed until one-third of the pad contacts the heating plate. Heat for 20 seconds.Then raise the pad and take it to the print station, press down until one-third of the pad contacts the golf ball, hold for 1.5 seconds, then raise the pad and take it back to the printing station. This one cycle is about 40 seconds. When one cycle was completed, the hot stamping foil was removed and the gold foil was transferred to about one-third of the top of the golf ball, and the gold foil was also clearly transferred to the concave patterns on the golf ball surface.

Concrete Example 2 Instead of the flat hot plate used in Concrete Example 1, a semicircular mold was made by cutting a golf ball in half, and a heater was placed inside to make a hot plate. When hot stamping was performed using this heating plate in the same manner as in Example 1, the transfer foil could be transferred to almost half of the top surface of the golf ball. In this case, a transfer foil using polypropylene as a base film was used as the transfer foil.

Example 3 To print a trademark in gold on the surface of a children's toy made of an eggshell mold made of ABS resin and filled with sand, first,
The trademark is printed using a pad ink manufactured by Jujo Kako Co., Ltd. and a Taihei Kogyo pad printing machine model T-20 described in Example 1.

Next, a transfer foil made by Murata Kinpaku Co., Ltd. was placed on the printed eggshell, and a heating plate containing a heater was installed on the printing engraving board of the pad printing machine, and the heating temperature was increased to 160°C.
Set the pad to 0. Then, after pressing the pad against the heating plate for 5 seconds, immediately move it onto the eggshell and bring it into compressive contact for 2 seconds. When the pad was moved and the transfer foil stuck to the eggshell was peeled off, the transfer foil was transferred only to the part of the trademark printed with the pad ink.

Concrete Example 4 In Concrete Example 3, without placing the transfer foil on the printed eggshell, the transfer foil was placed on a heating flat plate with the glue side facing upward, and the pad was pressed down on top of it. and touch it.

Next, when you raise the pad, the transfer foil has been transferred to the surface of the pad, so move it directly onto the eggshell, press it down to make compressive contact for 2 seconds, then raise the pad, and the transfer foil is printed with the pad ink on the surface of the eggshell. The transfer foil was transferred only to the trademark area. In this case, since the glue side of the transfer foil is exposed on the eggshell surface, it is necessary to use a transfer foil (referred to as backing metal) that is golden even when viewed from the glue side. Also, in this way, there is no resistance from the base film, so the transfer foil can be transferred to the depth of the curved surface.

〔Effect of the invention〕

As described above, in the present invention, the tip of the pad is heated by directly contacting the heating element, so the heating mechanism is simple, and the pad can be heated to the required temperature in a short time, which is different from the conventional pad printing machine. It is possible to create a heating band transfer machine that is sufficiently practical by simply attaching a heating element to a part of the machine.It is therefore inexpensive and can also be used on cubic curved surfaces that could not previously be hot stamped using this machine. This has the effect that hot stamping can be easily performed and the fields of use of hot stamping can be expanded.

Claims (1)

[Claims] A method for transferring a transfer foil, characterized in that the tip of a pad that presses and heats the transfer foil onto a transfer portion of an article to be transferred is brought into direct contact with a heating body and heated, and the transfer foil is thermally transferred using the residual heat.