JPS60131882A - Bone china flambe painting method - 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 the Invention The present invention relates to a painting method that can mass-produce bone china having a blurred pattern such as that produced by the blow-painting method.

BACKGROUND TECHNOLOGY Conventionally, in order to color a bone china product in a shading tone, the general method is to apply ceramic paint (hereinafter simply referred to as paint) to a glazed or fired clay surface by adding an appropriate amount of an inder and a solvent to make it liquid. It was created using the blow-painting method, in which materials are sprayed with a spray gun.

In this case, it is necessary to spray the liquid paint so that it is thicker at the edges and becomes lighter toward the center, but this requires a highly skilled person.

In addition, since it is completely done by hand, it is difficult to make all products have the same shading tone. Furthermore, in order to spray the liquid paint in the spray painting method in a shading tone, the parts that do not need to be sprayed are covered with silicone. It must be covered with a mask molded from a rubber plate or lead plate, which requires tedious work of preparing, labeling, and removing the mask, and it takes a long time to make the product and requires mass production. Since it is impossible, it has drawbacks such as being extremely expensive.

Purpose of the Invention The present invention has been made in view of the above-mentioned problems, and its purpose is to easily and mass-produce horn china products decorated with shading that have a uniform hue. It is in.

Structure and Function of the Invention The present invention involves creating a halftone photograph containing a pattern area with a dot pattern having an area ratio of 20 to 80%, and using a transfer paper printed with a screen original plate created from this, and using the transfer paper as the transfer paper. The painting is fired at a temperature of about 100 degrees Celsius or higher than the firing temperature used for the normal use of painted paints, but at a temperature of about 1,180 degrees Celsius or lower,
The technical gist is a method for painting bone china with a shading pattern by diffusing and flowing the paint into a softened glaze to reproduce a shading effect.

The present invention will be described in detail below with reference to the drawings.

When taking a halftone photo of a part of the picture that includes the edges, in order to obtain an effect similar to the blurred toning coloring achieved by the blow-out painting method, the original drawing with the blow-out painting is divided into several sheets, for example, three sheets, according to their shading. This was done in order to prevent the screen from producing smooth gradations or broken hard gradations when the halftone dot original was later printed onto transfer paper using the screen printing method, as shown in the enlarged plan view in Figure 2. , Light colored part (8a
) is wide, large area 1. The halftone photo originals are taken separately so that the medium dark color part (3b) has a medium width and medium area, and the dark color part (8C) has a narrow width and a small surface. In addition, in halftone photographs, the area ratio of halftone dots is 70 to 80% on the dark color side, and 20 to 30% on the light color side.
Adjustments are made so that the area ratio of halftone dots decreases sequentially from the edge to the center.

Next, each printing screen is created from the original plate of the halftone photographs taken for different shades of light and light. In this case, it is preferable to create a mesh screen original plate in which the thickness of the paint printed at one time is 4 to 12 μm.

A water-soluble glue layer (2) such as IJN (Dex) is coated on a water-absorbent mount (1) and then dried, and then the paint is printed in different shades by a known screen printing method. That is, the first
As shown in the enlarged cross-sectional view of the figure, first the light colored part (3a), then the medium dark colored part (8b), and then the dark colored part (3C).
) until the desired shaded change is obtained.
Repeat printing ~5 times, then screen print a film made of acrylic resin on top to form a carrier layer (4) and complete the transfer paper (5).

Next, as shown in FIG. 8(a), middle), the transfer paper (5) is transferred and pasted onto the glaze layer (7) of the glazed bone china base (6). The baking temperature is approximately 100 degrees Celsius or higher than the baking temperature of the normal usage of the paint using the transferred base (6) as the transfer paper, that is, the baking temperature at which the thin line part of the pattern is reproduced as it is. The painting is fired at a high temperature above the softening point of the glaze and below the upper limit firing temperature of bone china glaze, that is, about 1,180°C. In such a case, as shown in Figure 8 (c), the softened glaze layer (7
), while the paint spreads under its own weight at a temperature of about 100°C above the hunting temperature.
Because of the high temperatures above, the paint flows and the photographic halftone dots during printing completely disappear, making it possible to obtain a product with a shading effect similar to that produced by the blow-painting method.

In the method of the present invention, the pattern area including blurring is 20 to 80
The reason for creating a halftone photograph having an area ratio of 50% is that the above-mentioned method of picture printing produces a shading-tone decoration with a feel most similar to that of the blow-painting method.

EXAMPLE An original image including blurring is photographed using a color separation film for each shade to create a separation negative. This separated negative is divided into negatives for each density so that the dark color part has a small, medium and small area as shown in Figure 2 (3C), and as it goes to the light color part, it has a medium width and medium area (3bL wide width and large area (3a)). create.

If the changes in shading in the original drawing are extremely minute, create a black-and-white manuscript by spraying different shades of ink on Kent paper with ink for each shade, and photographing this with a camera to create each shade. Kayo ().

These light and shade negatives are halftone-photographed using a 183 lines/inch contact screen to create halftone dot originals for each shade. This halftone original plate has a halftone dot area ratio of 70 to 80% at the edges, and gradually decreases toward the center, reaching 20 to 80%.
It becomes 80% (Aru.

This halftone original plate was pasted on a transparent film corresponding to the area of the printing transfer paper for each shade, and this film was vacuum-adhered to a 250-mesh stainless steel screen coated with a photosensitive emulsion and fog-lighted. Develop and wash with water to obtain printing screens for each density.

Next, regarding paints, ceramic paints have a firing temperature of 760 to 840℃, the same as overpainting paints, or 1.100 to 1.200℃ for underpainting paints. There is. Since the upper limit of the firing temperature of bone china glaze is 1.180°C, an appropriate amount of flux for overpainting is added to the underpainting paint so that the firing temperature is 900 to 1.080°C, which is the usual baking temperature. Overglaze paints can be used individually without the need for temperature adjustment.

75 parts by weight of screen oil consisting of 15 parts by weight of Ethocel, 20 parts by weight of alkyd resin, and 65 parts by weight of solvent are mixed with 100 parts by weight of the above paint for overpainting or underpainting paint whose temperature has been adjusted with flux to create a paint paste. do. This paint paste is prepared for each shade.

Using the above-mentioned printing screen, the above-mentioned paint paste is applied to a transfer paper coated with a water-soluble glue layer (2) on a water-absorbent mount (1) by a known screen printing method, from light to medium-dark colors →
Screen print in the order of dark colors. After overprinting the paint paste, a carrier layer (4) made of acrylic resin is applied for 12 minutes.
Apply with a 0 mesh screen to complete the transfer paper.

Paste the above transfer paper onto the glazed surface of bone china,
1,000°C for overpainting paint, 1.000 to 1.180 for underpainting paint whose temperature has been adjusted with flux.
The painting is fired at ℃. In that case, since the temperature of the paint is more than 100 degrees Celsius higher than the normal temperature, it flows and diffuses into the softened glaze due to its own weight, and the halftone dots on the transfer paper completely disappear, producing the same effect as the blowing-e method. A bone china product with a blurred tone color is obtained.

Effects of the Invention As mentioned above, the present invention does not require skilled workers to produce shading-colored bone china, and also eliminates the need for masks, which are required when using the blow-painting method. Therefore, it is possible to shorten the manufacturing process and reduce manufacturing costs, and it is also possible to make the color of each product uniform, improving quality. Even on concave curved surfaces that cannot be painted, it is possible to apply a strong coloring by simply pasting transfer paper, etc. Bone china products with a gradation coloring that has a homogeneous color. This has the effect of making simple and mass production possible.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing a partially enlarged cross section of a transfer paper produced by the method of the present invention. FIG. 2 is a schematic diagram showing a partially enlarged plane. FIGS. 3(a), 3(0), and 3(c) are schematic diagrams showing the process of painting and firing bone china porcelain according to the method of the present invention, and show partially enlarged cross sections. 1: Water-absorbing mount, 2: Water-soluble glue layer, 8: Paint layer, 3R:
light color area, 3b: middle dark color area, 3C: dark color area, 4: carrier layer,
5; Transfer paper, 6; Glaze base 7: Glaze Asahi No. 1 Figure 3 Figure 2 (c)

Claims (1)

[Claims] (1) A halftone photograph with an area ratio of 20 to 80% is created for the picture area including shading, and a transfer paper printed with a screen original plate created from this is used.The usual ceramic paint used on the transfer paper Approximately 100℃ higher than the baking temperature for usage.
A method for painting bone china with shading, which is characterized by firing the painting at a high temperature above and below about 1,180°C, and diffusing and flowing the ceramic paint into the softened glaze to reproduce a shading tone.