JPS6142640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat transfer method for applying a desired pattern to a relatively small synthetic resin molded article having an uneven surface, such as a button. More specifically, the present invention relates to a heat transfer method for applying a sharp pattern with a clear hue to the uneven surface of the synthetic resin molded article.

BACKGROUND ART Conventionally, as a method of applying a colored pattern to a decorative object such as a synthetic resin button, a method of kneading a coloring agent such as a pigment into a synthetic resin and coloring it is known. In that case, it is known that by appropriately controlling the mixing and dispersion of the colorant, it is possible to obtain flowing patterns, shading patterns, or pearl-like patterns. However, with this method, the pattern lacks transparency and the hue lacks sharpness, requiring a polishing step afterwards, and the pattern is also undesirable because it has a flowing pattern.

For this reason, there is a method of molding decorative items such as buttons and then immersing them in a dye bath and dyeing them by heating, but this method only produces a plain tone and cannot reproduce patterns, so it is not necessarily preferable.

There is also a method of pasting a transparent film with a pattern on the button, or a method of thermally transferring the pattern on the transparent film with a release layer to the button, but these methods are also undesirable due to poor dry cleaning and abrasion fastness. .

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method that can easily apply a sharp pattern with a clear hue to a large amount of synthetic resin molded products at the same time.

That is, the present invention arranges and places a plurality of synthetic resin moldings having uneven surfaces on a support base, and also provides sublimation properties, vaporization properties, melt migration properties, etc. on these synthetic resin moldings. A transfer sheet coated with a heat-transferable dye is polymerized, and the transfer sheet is coated with the unevenness that matches the shape of the uneven surface of the synthetic resin molding so that the transfer sheet adheres to the uneven surface of the synthetic resin molding. A synthetic resin molded product, characterized in that engagement support plates having a cross-sectional shape substantially complementary to the surfaces are superimposed and then heated, thereby imparting a sharp pattern with a clear hue to the synthetic resin molded product. The present invention provides a thermal transfer method.

In the present invention, heat transferable dyes such as sublimable, vaporizable or melt-transferable dyes include disperse dyes, cationic dyes, oil-soluble dyes, etc. Specifically, diamond aceriton pink B, diaceriton violet, etc. 3R (manufactured by Mitsubishi Kasei Co., Ltd.), Sumikalon Yellow E-FG (manufactured by Sumitomo Chemical Co., Ltd.), Eisencatilon Yellow 3GLH, Eisencatilon Red 6BF (manufactured by Hodogaya Chemical Co., Ltd.), Plasti Violet 8840
(manufactured by Arimoto Chemical Co., Ltd.), etc.

In addition, the sheet base of the transfer sheet used in the present invention may be paper such as Western paper (wood-free paper, medium-quality paper, laminated paper, art paper, coated paper, gravure paper, etc.), Japanese paper (hoshi paper, etc.), nonwoven fabric, or film. , metal foil, etc. can be used, but those with flexibility are particularly preferred.

In addition, the engagement support plate used in the present invention includes various metal plates, plywood, heat-resistant resin plates, etc.
It is preferable to use a material that can withstand a pressure of about 100 g/cm ² and a high temperature of about 200°C.

The synthetic resin moldings to be applied in the present invention include thermoplastic or thermosetting resins such as polyester, polyacrylic, polyamide, and polypropylene, or these resins and natural products (shells, fish scales, mica, etc.) or metal powders ( It is particularly effective in the case of molded products and mixtures of lead, tin, aluminum, etc., which are relatively small and have uneven surfaces, such as ornaments such as buttons. The method according to the present invention will be specifically explained with reference to the drawings, taking buttons as an example. A large number of buttons 2 are placed on a metal frame 1 as shown in FIGS. They are arranged in parallel in a plane facing upward, and a heat insulating material 3 made of foam or the like is surrounded by them. If this heat insulating material 3 is not applied, the buttons 2 arranged around the frame 1 will be removed during the heat transfer process later.
The color tone of the buttons 2 is darker than that of the buttons 2 arranged in the center, and the entire button 2 is not colored uniformly. This is considered to be an effect of heat conduction from the periphery of the frame 1. Therefore, insulation material 3 is placed around the frame 1.
By arranging this, heat conduction from the periphery of the frame 1 to the button 2 is relaxed, and the entire button 2 can be uniformly dyed. Therefore, the width etc. of this heat insulating material 3 are appropriately selected in consideration of the size, thickness etc. of the button 2. Next, a transfer sheet 4 with a desired pattern (plain in some cases) is placed on the top surface of the button 2.

In addition, as shown in FIG. 1, the bottom of the frame 1 has
For example, a spacer 4 made of a cushion material may be laid in advance, and the button 2 may be placed on top of the spacer 4. The spacer 5 has various thicknesses depending on the thickness of the button 2. That is,
The thickness of the spacer 5 affects the transfer pressure. Therefore, if you want to faithfully reproduce the pattern on the transfer sheet 4, increase the thickness of the spacer 5, and conversely, if you want to dye it in a blurred tone, use a thinner spacer 5. the transfer sheet 4 and the upper surface of the button 2 so as to form a space between the transfer sheet 4 and the top surface of the button 2.

Next, as shown in FIGS. 3 and 4, a ring-shaped or disc-shaped plate is placed on the transfer sheet 4 according to the shape of the uneven surface of the button 2 so that the transfer sheet 4 is in close contact with the uneven surface of the button 2. The engagement support plates 6 are overlapped. Next, the frame 1 is housed in a vacuum transfer device as shown in FIG. 5, for example, and transfer is performed. This vacuum transfer device includes a base 7, a lid 9 that is in close contact with the base 7 and can form a vacuum chamber 8, and
A movable frame 1 placed on top and supporting the frame 1
0, and a heating plate 11 for heating the transfer sheet 4 etc.
It mainly consists of a cylinder 12 that is moved up and down over the lid 9 and the hot platen 11, and means (not shown) for evacuating the inside of the chamber 8.
When heat-transferring a synthetic resin molded product, if the heating temperature is too high, the molded product may become soft and deform under pressure. Therefore, it is necessary to appropriately select the transfer temperature and pressure depending on the type of synthetic resin.

Although the description has been made using a reduced pressure transfer device, it goes without saying that a normal pressure transfer device may also be used.

In this way, by interposing the engagement support plate 6, which is ring-shaped or disc-shaped and matches the shape of the uneven surface of the button 2, between the heating plate 11 and the transfer sheet 4, the unevenness of the transfer sheet 4 and the button 2 can be adjusted. Heat-transferred button 2 that allows for tight contact with the surface
It had a clear hue and a sharp pattern.

Example 1 Ink containing disperse dye with the following formulation, basis weight 54g/m ²
Fine pattern plate on one-sided starch-coated paper (plate depth 40
A transfer sheet was created by gravure printing.

Ink Micalon Turquoise Blue S-GL (Sumitomo Chemical
15 parts by weight polyacrylic acid ester 10 〃 Isopropyl alcohol 40 〃 Water 33 〃 Liponox NA (Surfactant manufactured by Lion Yushi Co., Ltd.) 2 〃 This transfer sheet was made of polyester having a concave shape. Button (diameter 22mm, recess diameter 16mm, thickness 5
As shown in Figure 3, a disc-shaped aluminum engagement support plate (diameter 16 mm, thickness 3 mm) was superimposed on top of the 200 mm) under the following transfer conditions, heating conditions 200℃, transfer time 70 seconds, vacuum level 10
The vacuum heat transfer process was carried out using an Arirotuper machine (Toyo Ink Co., Ltd. - Naomoto Kogyo Co., Ltd. vacuum transfer machine) under the conditions of mmHg, pressure condition of 20 g/cm ² , and spacer (aluminum plate) of 5 mm. However, it was possible to create a clear and elaborate fine pattern on the flat and recessed parts of the button.

Furthermore, even after rubbing this button 100 times with pure cotton, there was no discoloration or staining, and the light fastness and dry cleaning fastness were also good.

Example 2 A cationic dye-containing ink with the following formulation has a basis weight of 49
A transfer sheet was prepared by gravure printing on one-sided starch-coated paper of g/cm ² using a plate with a small flower pattern (plate depth: 35 μm).

Ink Cramps Cachilon Yellow 3GLH (Hodogaya Chemical
Co., Ltd.) 15 parts by weight Ethylcellulose N-7 (Ethylcellulose manufactured by Hercules Co., Ltd.) 10 〃 Isopropyl alcohol 40 〃 Toluene 20 〃 Xylene 15 Acrylic button (diameter
16mm, convex diameter 10mm, thickness 5mm),
Furthermore, as shown in Figure 4, a ring-shaped aluminum engagement support plate (outer diameter 16 mm, inner diameter 10 mm,
(thickness 3 mm) were superimposed, and the following transfer conditions were applied: heating condition: 205℃, transfer time: 80 seconds, pressure condition: 100g/cm ² ,
When the spacer (aluminum) was 5 mm and the normal pressure transfer was performed using a Kanegitsusa machine (a normal pressure transfer machine manufactured by Kanegitsusa Co., Ltd.), a clear and elaborate yellow floret pattern appeared on the flat and convex parts of the button. It was possible to obtain polyester and polyacrylic buttons having the following properties. In addition, it had the same robustness as the button of Example 1.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the state of the frame and the buttons housed inside the frame used to carry out the thermal transfer method according to the present invention, FIG. 2 is a plan view of the frame shown in FIG. 1, Fig. 3 is a sectional view showing a state in which a disk-shaped engagement support plate is used, Fig. 4 is a sectional view showing a state in which a ring-shaped engagement support plate is used, and Fig. 5 is an example of a transfer device. FIG. In the figure, 1 is a frame, 2 is a button, 3 is a heat insulator, 4 is a transfer sheet, 5 is a spacer, 6 is an engagement support plate, 7
is a stand, 8 is a chamber, 9 is a lid body, 10 is a stand, 1
1 is a heating plate, 12 is a cylinder.

Claims (1)

[Scope of Claims] 1. A plurality of synthetic resin molded articles having uneven surfaces are placed in a planar arrangement on a support base, and a sublimation vaporizability, melt migration property, etc. are applied to these synthetic resin moldings. A transfer sheet coated with a heat transferable dye is polymerized, and a cross-sectional shape that is almost complementary to the uneven surface of the synthetic resin molded article is formed on the transfer sheet so that the transfer sheet adheres to the uneven surface of the synthetic resin molded article. 1. A heat transfer method for a synthetic resin molded article having an uneven surface, characterized in that engaging support plates having the above-mentioned materials are overlapped and heated, whereby a desired pattern is applied to the synthetic resin molded article. 2. The method according to claim 1, wherein a desired pattern is applied to a synthetic resin molded product having a concave surface using a disc-shaped engagement support plate. 3. The method according to claim 1, wherein a ring-shaped engagement support plate is used to apply a desired pattern to a synthetic resin molded product having a convex surface. 4 Claims 1, 2, and 3 characterized in that a flexible transfer sheet is used.
The method described in section. 5. The method according to claims 1, 2, 3, and 4, characterized in that heating is performed under reduced pressure. 6. The method according to claims 1, 2, 3, 4, and 5, characterized in that the synthetic resin molded article is surrounded by a heat insulating material. 7. Claims 1, 2, 3, and 4, characterized in that a spacer is placed in advance at the bottom of the support base to adjust the space between the surface to be dyed of the synthetic resin molding and the transfer sheet. Sections, Sections 5 and 6
The method described in section.