JPH0313981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for painting the surface of a curved object using a pad printing method, and more specifically, a method for painting a continuous pattern on a convex curved surface having protrusions on the surface. The purpose is to provide the following.

BACKGROUND ART Conventionally, it is well known that a pad printing method can be used to decorate curved objects such as ceramics. However, the shapes of the pads used in this painting method are, for example, simply conical, cylindrical, or bell-shaped (the cross section is square-shaped), so they all have concave curved surfaces or relatively gentle shapes. It is suitable for painting on convex curved surfaces, etc., but for example, convex curved surfaces with protrusions on the surface such as the outer surface of ceramic bowls and plates, or curved surfaces with large changes. When painting, the surface of the pad may become embedded in the protrusions during transfer printing and receive resistance, making it impossible to obtain a sufficiently uniform contact pressure around the protrusions. If the surface is wide, an extremely large pad is required, which becomes uneconomical, and it also becomes impossible to obtain sufficient transfer pressure around the pattern, and furthermore, the deformation rate of the pad increases, causing the pattern to collapse. Due to these drawbacks, it is unsuitable for painting on the surfaces of these curved objects.

The present inventor has completed the present invention as a result of various studies aimed at improving the various drawbacks of the pads used in the conventional pad printing described above. That is, the present invention, when forming a multi-dot or continuous pattern by pad printing on the surface of a curved object having protrusions on the surface, has a bell-shaped overall shape and a concave portion at the top to receive the protrusions. This is a method of painting on the surface of a curved object, which is characterized by using a pad.

The present invention will be explained in detail below based on the drawings.

As shown in the drawings, the present invention uses a pad 2 whose overall shape is bell-shaped and has a concave portion 1 of an appropriate size formed at the top of the pad 2. The ink layer 5 with an arbitrary pattern formed thereon or the 8th surface of the transfer layer (including the ink layer 5' with the pattern formed thereon) of the transfer sheet 4 placed on and heated on the 6th surface of the hot plate is pressed and once Transfer the ink layer 5 or 5' to the 2nd surface of the pad (Figs. 1 to 4).
(see figure). Next, the pad 2, which temporarily supports the ink layers 5, 5' on the surface, is attached to the surface of an object 10 having a convex curved surface and having protrusions 9 on the surface fixed by a jig 11. This is a method of painting by transferring the ink layer 5 or 5' onto the surface of the curved object by pressure contact or heat pressure contact (see FIGS. 5 to 7).

The recess 1 formed in the pad 2 in the present invention may have an appropriate shape and size depending on the shape and size of the protrusion 9 of the object 10 having a curved surface, which is the object to be painted. Usually, this recess 1 is preferably about 1.5 to 2 times the size of the protrusion 9 and shaped like a circular groove.

Also, this pad 2 is made of an elastic material, such as natural rubber,
Since it is necessary to use synthetic rubber, gelatin, etc., which have poor adhesion to the surface of the object to be painted, and also have the property of supporting the painting ink in a temporary state, the elasticity of these materials Silicone rubber is particularly suitable for the body.

When painting an object 10 having a curved surface using the transfer sheet 4, first, the transfer sheet 4 is
A hot plate 6 heated by a built-in heater 7
The ink layer 5' is transferred to the pad surface by pressing the pad 2 onto the pad while heating it in a temperature range of 80°C to 200°C.
All you have to do is press it against the surface.

Various types of transfer sheets can be used here depending on the type of object to be painted. For example, inorganic pigments, organic pigments, dyes, etc. can be used as the coloring agent for the pattern ink in the transfer layer of the transfer sheet, and various materials and layer configurations can be used. Examples of transfer sheets used in the present invention include a layered structure in which a wax layer 13 and a pattern layer 15 are sequentially laminated on a base sheet 12 (see FIG. 8); 12 (see FIGS. 9 and 10), or the base sheet 12 Wax layer 1 with tackiness added on top
3', a pattern layer 15' and, if necessary, a coating layer 16' (see FIG. 11) can be suitably used. In addition, a metal pigment layer 17 is provided before and after or on the same surface of the pattern layer 15. A material provided with a metal vapor deposition layer or the like (see FIG. 12) can also be used.

When using a printing plate instead of these transfer sheets, it is preferable to mainly use a concave plate. Of course, various types of ink can be used in this case as well, as in the case of the transfer sheet.

In the present invention, transfer painting is performed using a pad having a concave shape at the top as described above, so that the surface of the pad does not dig into protrusions on the surface of the object to be transferred during transfer printing. Since the pad can be pressed against the surface smoothly, the pattern can be painted extremely faithfully without causing any deterioration of the picture, and at the same time, the pad is not damaged, so it is an extremely economical painting method with a long life.

Examples will be shown and explained below. All parts represent parts by weight.

Example 1 Using 128 g/ ^m2 coated paper as a base sheet, a first wax layer and a second wax layer were sequentially laminated using a mixture of the following components, and then an ink for painting enamel products containing an inorganic pigment as a main component was applied. Using this method, a transfer sheet was obtained on which a pattern layer consisting of a continuous belt-like pattern with a diameter of about 140 mm was formed by screen printing (see Fig. 8).

First wax layer Hydrocarbon resin 38 parts Synthetic alloy Hoechst wax Caw-20 (manufactured by Hoechst) 8 parts Oxidized modified Hoechst wax KPE (manufactured by Hoechst)
12 parts Oxidized modified Hoechst wax R-21 (manufactured by Hoechst)
4 parts Ethylene copolymer wax 8 parts Beeswax 4 parts Paraffin wax 16 parts White oil 10 parts 2nd wax layer Hydrocarbon resin 16 parts Oxidized modified Hoechst wax KPE 16 parts Ethylene copolymer wax 12 parts Castor wax 8 parts Beeswax 8 parts Paraffin 24 parts of wax 16 parts of white oil This transfer sheet was placed on a hot plate heated to 130℃, and the height was 280mm and the diameter was 230mm as shown in Figure 2.
A pad made of silicone rubber (hardness 74, Asker F-type hardness tester), which is bell-shaped and has a cylindrical recess with a diameter of 45 mm and a depth of 50 mm, is pressed against the pad surface. The pattern layer was transferred (see Figures 3 and 4).

This pad is then cut to a diameter as shown in Figure 5.
The convex curved surface of the lid of an enamel container with a diameter of 180 mm and a height of 40 mm has a protrusion of 30 mm and a height of 10 mm, and is pressed so that the concave part of the pad matches the convex part of the lid. Then, the pattern layer was transferred to the surface of the lid (see FIGS. 6 and 7).

Thereafter, the lid was fired at 800° C. for 2 minutes, resulting in a lid of an enamel container with a beautiful design painted on it.

Example 2 A 128 g/m ² coated paper was used as a base sheet, on which the first wax layer and second wax layer described in Example 1 were sequentially laminated, and gravure printing was performed on this using a sublimable dispersion ink. A pattern layer was formed to obtain a transfer sheet.

This transfer sheet was placed on a hot plate heated to 130℃, and the height was 130mm and the diameter was 220mm as shown in Figure 13.
A silicone rubber pad with a bell-shaped recess of 50 mm in diameter and 50 mm in depth at the top (hardness 57, measured using an Asker F-type hardness tester).
was pressed to transfer the pattern layer to the pad surface.

This pad is then cut to a diameter as shown in Figure 14.
The convex curved surface of a die-cast bowl having a protrusion of 40 mm and a height of 10 mm and having a diameter of 112 mm and a height of 50 mm is pressed so that the concave part of the pad matches the convex part of the bowl, thereby forming the bowl surface. The pattern layer was transferred to.

Thereafter, the bowl was heat-treated at 160° C. for 10 minutes, and then the residue on the surface of the bowl was removed using a solvent to obtain a die-cast bowl with a beautiful design.

[Brief explanation of the drawing]

FIGS. 1 to 7 are schematic cross-sectional views showing the steps of the present invention, and FIGS. 8 to 12 are schematic cross-sectional views showing embodiments of the transfer sheet used in the present invention. FIG. 13 is a sectional view showing one embodiment of the pad used in the present invention. FIG. 14 is a perspective view of an object (a bowl) obtained by the present invention. In the figure, 1... recess, 2... pad, 3... printing plate, 4... transfer sheet, 5... ink layer, 5'...
...Ink layer forming the pattern, 6... Hot plate, 7...
Heater, 8... Transfer layer, 9... Protrusion, 10...
...Object having a curved surface, 11...Jig, 12...
Base sheet, 13... Wax layer, 14... Adhesive layer, 15... Design layer, 16... Covering layer, 17...
metal pigment layer.

Claims (1)

[Claims] 1. When forming a multi-dot or continuous pattern by pad printing on the surface of a curved object having protrusions on the surface, the overall shape is bell-shaped and has a concave portion at the top to receive the protrusions. 1. A method for painting a surface of a curved object having protrusions on the surface, the method comprising using a pad made of a material. 2. Claim 1, characterized in that the pad printing is performed by a method using a transfer sheet.
Method of painting on the surface of a curved object as described in Section 1.