JPH02267000A - Transferring method for foil to synthetic resin base material and product as well as structure of transfer foil used for the same method - Google Patents

Abstract

PURPOSE:To accurately print a fine pattern, etc., and to effectively bring a foil into close contact with a base material by pressurizing a flat plate or a roller heated at a surface temperature to a temperature or higher for softening a medium and an adhesive layer from above the foil, and transferring the foil only on the medium face in a heating temperature region higher than the softening temperature of the material. CONSTITUTION:After a medium 21 for forming a character, a figure, a symbol or a pattern, etc., 3 is adhered and solidified on the surface of a base material 20 by silk coating or mask coating, a transfer foil 22 is brought into close contact with the foil transfer face of the material 20 including the medium 21, and the foil is transferred only onto the surface of the medium 21 in a heating temperature region higher than the softening temperature of the material 20. In this case, even if the foil transferring surface of the material 20 is hot stamped in the high heating temperature region as the foil 22, the foil 22 which is not absolutely adhered is used, and the medium 21 includes, for example, printing ink such as black formed by mixing acrylic vinyl acetate ink such as 40% of vinyl chloride, 40% of acrylic resin and 20% of solvent so that the softening temperature becomes 80-90 deg.C.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a foil transfer technology generally referred to as "hot stamping", and is used to print various characters with a predetermined color or metallic luster on sign lights and equipment display parts. The present invention relates to a foil transfer method and product to a synthetic resin base material on which figures, symbols, or patterns (hereinafter referred to as "patterns, etc.") can be freely formed, and the structure of the transfer foil.

[Conventional technology]

A foil transfer technology commonly referred to as "hot stamping" has been used in the past, and is used to create patterns, etc., including characters, by placing a transfer foil in close contact with a material to be transferred (hereinafter referred to as the "base material") and displaying it from above. There is a method of heating and pressing a mold with unevenness, and a method of applying an unevenness such as a pattern to the base material in advance and transferring the transfer foil on the convex surface, but in these methods, if the transfer part is in a negative state, the foil The adhesion area becomes large and pinhole-like defects are likely to occur.On the other hand, those in a positive state have the disadvantage that the exposed area of the base material is large and heat fusion damage is likely to occur. Therefore, as a means to improve this, when transferring a predetermined pattern onto a base material such as thermoplastic plastic, first ink, paint, and contact material (hereinafter referred to as "medium") are
In order to create a predetermined pattern on a base material using silk printing or mask painting, which is an in-house method, and to form a transfer foil only on this medium, (1) one that utilizes the level difference between the base material and the medium ( (Japanese Patent Publication No. 56-9708) (2) Hot stamping using the difference in heating and pressure conditions between the base material and the medium (Utility Model Publication No. 58-35490) (3) Melting temperature between the base material and the medium Various techniques have been proposed, such as the one disclosed in Japanese Patent Publication No. 18360/1983, in which hot stamping is carried out at temperatures in the intermediate temperature range.

[Problem to be solved by the invention]

However, in method (1) above, since the thickness of the medium is a few microns at most, the differential pressure is absorbed by the elasticity of the silicone rubber of the hot stamp, such as a flat plate or roller that presses the medium, and the substrate surface Since the foil is also subjected to the same pressing force as the medium surface, it is not possible to expect the effect of foil transfer only to the medium surface.

In addition, in (2) and (3), the difference in heating and pressing conditions and melting temperature between the base material and the medium is only a few tens of degrees Celsius at most, and the variation in stamping conditions not only causes a lack of hot stamping stability. , In some cases, there are many problems such as hot stamping on the base material. Also, for example,
Even if the printing is beautifully done, this temperature range is a relatively low temperature range (approximately 80°C to 150°C) as the heating temperature for general hot stamping, and when conducting an adhesion test, There were problems such as not being able to obtain products with satisfactory quality.

The present invention was devised in view of the above-mentioned problems, and provides a foil transfer method and method for a synthetic resin base material in which fine patterns, etc. can be printed accurately, and the foil reliably adheres to the base material. The purpose of this invention is to provide a product and the structure of a transfer foil used in the foil transfer method.

[Means to solve the problem]

In order to achieve the above object, the method for transferring foil to a synthetic resin base material according to the present invention involves silk printing or mask coating on the surface of a synthetic resin foil transfer base material made of polycarbonate resin with a high heat distortion temperature. After adhering and solidifying a medium made of, for example, acrylic vinyl acetate ink to form characters, figures, symbols, patterns, etc., a nitrocellulose adhesive with adhesion selectivity is applied to the foil transfer surface of the substrate containing the medium. A transfer foil on which an adhesive layer containing a predetermined pigment has been formed is closely attached, and a flat plate or roller heated to a surface temperature of approximately 200° C. or higher to soften the medium and the adhesive layer is heated from above the transfer foil. The gist of this method is to transfer the foil only onto the surface of the medium in a heating temperature range higher than that of the substrate.

That is, first, the heating temperature region (1
Because hot stamping is performed at a temperature of 50℃ to 230℃,
The material of the base material is limited to polycarbonate resin with a high heat distortion temperature.

The hot stamping method involves applying the medium in a pattern or the like using the general method described above on the foil transfer surface of a base material made of polycarbonate resin, and after drying, the foil is applied onto the base material surface as described above. Transfer foil configured to never adhere even in the high heating temperature range, i.e., an adhesive that is made by mixing appropriate pigments and nitrocellulose adhesive and softens at a flat plate or roller surface temperature of 150°C or higher. If hot stamping is performed using a layered transfer foil, the foil will not adhere to the base material surface, and it will be possible to apply a predetermined hot stamp only to the medium surface.

The quality of the product obtained in this way is that even though it was hot-stamped in a high heating temperature range, there was no effect of heat such as roughness on the base material surface, and it had a good appearance and good adhesion. Because it is heated and pressurized at high temperatures, it has excellent properties.

The above structure is designed to prevent the foil itself from adhering to the surface of the substrate, regardless of the level difference in the medium or the difference in thermal deformation temperature between the substrate and the medium, as in the conventional technology, and is different from ordinary transfer foil. When hot stamping is performed under the above hot stamping conditions using vinyl or acrylic transfer foil, which is the adhesive layer material of Needless to say, this product cannot be obtained.

[Effect]

Since the foil transfer method for a synthetic resin base material according to the present invention is configured as described above, the adhesive selectivity of the nitrocellulose adhesive layer formed on the transfer foil allows the medium to be transferred in a heating temperature range higher than the softening temperature of the base material. Hot stamping can be performed only on the surface, and since the surface of the adhesive layer of the transfer foil is extremely smooth (111 surface), the surface of the base material can be maintained smooth even during hot stamping, and it can be heated at high temperatures. And since it is pressurized, the adhesion of the foil to the medium is good,
Moreover, no thermal effects such as clouding occur on the surface of the base material.

In addition, products hot-stamped by the above method have a beautiful appearance and can be of good quality.

〔Example〕

The foil transfer method for a synthetic resin base material according to the present invention includes the first
This is for forming characters, figures, symbols, patterns, etc. 3 on the surface of a display board 2 attached to the display surface of a display device 1 as shown in FIGS. In the present invention, the display panel 2 is made of transparent glass having the properties described in detail below. It is formed using a synthetic resin base material 20.

Hereinafter, preferred embodiments of the foil transfer method for synthetic resin substrates according to the present invention will be described with reference to FIGS. 3 to 5.

In the practice of the present invention, the substrate to be hot stamped is
Heating temperature range higher than conventional foil transfer method (150℃~2
Since hot stamping is performed at a temperature of about 30°C, the material is limited to polycarbonate resin with a high heat deformation temperature.

The medium 21 forms characters, figures, symbols, patterns, etc. 3 on the surface of the base material 20 by silk coating or mask coating.
After adhering and solidifying (see FIG. 3), the transfer foil 22 is closely attached to the foil transfer surface of the base material 20 containing the medium 21, and the medium 21 is heated in a heating temperature range higher than the softening temperature of the base material 20.
The foil is transferred only onto the surface, and a transfer foil 22 configured so as to never adhere even when hot stamping is applied to the foil transfer surface of the base material 20 in a high heating temperature range is used.

The medium 21 includes acrylic vinyl acetate ink,
For example, using a printing ink such as black made by mixing 40% vinyl chloride, 40% acrylic resin, and 20% solvent so that the softening temperature is 80°C to 90°C, apply this to the foil transfer surface of the base material 20 and harden it. do.

In addition, the transfer M22 is formed by properly adhering a pigment layer 25 to the surface of a film 23 having a strong tensile strength such as polyester via a release layer 24, and applying a nitrocellulose adhesive as an adhesive layer to the surface of the pigment M25. Mix appropriate pigments, 15
It is formed by adhering an adhesive layer 26 that softens at a roller surface temperature of 0° C. or higher (see Figure 4). This nitrocellulose adhesive has selective adhesive properties and is made of polycarbonate resin. It has the property of not adhering to the surface of the base material 20 having the above structure, but adhering only to the surface of the medium 21.

The transfer foil 22 configured in this way is transferred to the base material 2 containing the medium 21.
Roller 2 that is in close contact with the foil transfer surface of
7 (or a single plate) to heat and press the transfer foil 22 from above. Thus, hot stamping can be performed only on the medium 21 by moving the film 23 of the transfer foil 22 from the foil transfer surface of the base material 20 (see FIG. 5). 2B is a heater.

The product obtained by the above foil transfer method is produced by drawing characters, figures, symbols, patterns, etc. on a base material 20 made of polycarbonate resin with a high heat distortion temperature using paint, printing ink, etc. as a medium 21. It has a structure in which an impermeable or semi-permeable membrane layer is attached, and the transfer foil 22 is adhered to the impermeable or semi-permeable membrane layer with an adhesive layer 26 made of a pigment and a nitrocellulose adhesive interposed as appropriate, The prize was that even though it was hot stamped in a high heating temperature range, there was no effect of heat such as clouding on one side of the base material (it also had a good appearance and had good adhesion at high temperatures). Because it is heated and pressurized, it becomes a good product.

(Effects of the Invention) Since the foil transfer method for a synthetic resin base material according to the present invention is configured as described above, it can be applied to a higher heating temperature range using a conventional foil transfer method such as an up-down method or a roll method. Not only can hot stamping be applied to the base material surface, but the transfer foil has excellent adhesion to the media, and the product also prevents thermal effects such as clouding on the base material surface, and has an excellent appearance. It has extremely excellent effects such as good results.

[Brief explanation of drawings]

Fig. 1 is a front view of the display device, Fig. 2 is a sectional view taken along the line nn in Fig. 1, Fig. 3 is an enlarged sectional view of main parts showing the structure of the base material, and Fig. 4 shows the structure of the transfer foil. FIG. 5, an enlarged sectional view of the main part, is an explanatory diagram showing an example of the foil transfer method. 2... Display board 3... Pattern etc. 20...
・Base material 22... Transfer foil 24... Release layer 26... Adhesive layer 21... Medium 23... Film 25... Pigment layer Patent applicant Koito Seisakusho Co., Ltd.

Claims (4)

[Claims] (1) A medium for forming characters, figures, symbols, patterns, etc. is adhered and solidified by silk printing or mask painting on the surface of a synthetic resin foil transfer substrate made of polycarbonate resin with a high heat distortion temperature, and then A transfer foil on which an adhesive layer made of a nitrocellulose adhesive is formed is closely attached to the foil transfer surface of a base material containing a medium, and the surface temperature is raised from above the transfer foil to a temperature at which the medium and adhesive layer soften. A method for transferring foil to a synthetic resin substrate, characterized in that the foil is transferred only onto the medium surface in a heating temperature range higher than the softening temperature of the substrate by applying pressure with a heated flat plate or roller. (2) The foil transfer method for a synthetic resin substrate according to claim 1, wherein the medium is an acrylic vinyl acetate ink. (3) An opaque or semi-transparent film layer that depicts characters, figures, symbols, patterns, etc. is adhered to a base material made of polycarbonate resin with a high heat distortion temperature using paint, printing ink, etc. as a medium, and the opaque or A product in which a transfer foil is adhered and formed by adhering the transfer foil to a semi-permeable membrane layer with a nitrocellulose adhesive interposed as an adhesive layer. (4) A nitrocellulose adhesive that forms a suitable pigment layer on the surface of a film with strong tensile strength such as polyester via a release layer, and that softens at a flat plate or roller surface temperature of 150°C or more on the surface of the pigment layer. The structure of a transfer foil for foil transfer to a synthetic resin base material formed by adhering layers.