JP2983458B2 - Manufacturing method of enamel member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an enamel member formed by firing a color transfer sheet on the surface.

[0002]

2. Description of the Related Art Generally, enamel members are used in various fields such as car side plates for elevators, taking advantage of the robustness and design advantage of enamels. For example, Japanese Patent Application No. 3-332816 discloses an enamel member. A method of manufacturing an elevator car side plate using an enamel plate has been proposed. A conventional enamel member of this type is formed from a base metal plate having a predetermined thickness into a predetermined shape by a can-making operation, performing a surface treatment such as degreasing and pickling, and then performing nickel plating. , A three-stage firing operation was repeated. The three-stage firing operation is as follows. First, the surface of the nickel-plated base metal plate is undercoated with a glaze, dried and fired, and in the second stage, the glaze is middle-coated, dried and fired. In the third step, the glaze is overcoated, dried and fired.

On the other hand, Japanese Patent Application Laid-Open No. Hei 5-318990 describes a technique in which a color photographic transfer sheet is fired on the surface of a ceramic or the like in order to enhance the aesthetics and design of the surface of the ceramic or the like. ing.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have studied firing a color photographic transfer sheet on the surface of an enamel member in order to give the enamel member a sense of high-grade design. However, based on previous experience, a photographic transfer sheet was stuck to the surface of the enamel member, and after drying, the temperature was increased at a rate of 100 ° C./hour for 4 to 5 hours.
The firing temperature was raised to 0 to 500 ° C and firing was performed. After the temperature was once returned to normal temperature, the temperature was rapidly increased to 650 to 800 ° C in the order of minutes and the main firing was performed. It turned out that it could not be reproduced.

It is an object of the present invention to provide a method for manufacturing an enamel member capable of reproducing a very fine color photographic image using a photographic transfer sheet.

[0006]

According to the present invention, in order to achieve the above object, a photographic transfer sheet is attached to an enamel member after applying a glaze for a cover coating and firing, and then drying and firing. In the method for manufacturing an enamel member, the photographic transfer sheet is baked by a photographic transfer sheet baking step having at least two-step temperature-raising characteristics performed almost continuously without returning to room temperature, and the baking temperature of the glaze of the cover coating is reduced . When T1 is the maximum temperature of the baking step for a photographic transfer sheet and T2, T
1> T2 .

[0007] The method for manufacturing an enamel member according to the present invention comprises:
As described above, the generation of cracks is prevented by the photographic transfer sheet baking process that is performed almost continuously without returning to room temperature with the two-stage temperature rise characteristic, and the maximum temperature T2 of the photographic transfer sheet baking process is set to Since the temperature is set lower than the firing temperature T1 of the glaze, it is possible to prevent the surface of the cover coating formed in the previous step from being repeatedly exposed to the firing temperature and being deteriorated, and to obtain a very beautiful enamel plate with a photo transfer sheet. It became so.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a method for manufacturing an enamel plate as an enamel member according to an embodiment of the present invention. In the figure, the left side shows the manufacturing process of the photographic transfer sheet, and the right side shows the manufacturing process of the enamel plate and the subsequent process of baking the photographic transfer sheet on the enamel plate. First, the manufacture of an enamel plate will be described. In step S1, a base metal plate having a predetermined thickness, for example, 0.35 to 0.5 mm, is formed into a predetermined shape by a can-making operation, and in step S2, the surface is degreased and acidified. After surface treatment such as washing, nickel plating is applied in step S3, and then, as a first-stage firing operation, a glaze of generally black ground coating is applied on the surface of the nickel-plated base metal plate in step S4. And then dried in step S5, and then
Baking at about 800 ° C. Subsequently, in step S7, the glaze of the white cover coating is middle-coated, dried in step S8, and fired at T1 ° C. in step S9. At this time, for example, the firing temperature T1 ° C is 780 ° C
Apply a glaze for cover coating.

On the other hand, in the manufacturing process of the photographic transfer sheet, a photographic print or a negative or positive film is prepared in advance in step S20, and this is subjected to trimming color separation in step S21. That is, the original image prepared as a photographic print or a negative or positive film is color-separated into three primary colors (yellow, magenta, cyan) and black. Then, in step S22, a plate made by trimming and color separation is obtained, which is uniformly set to four sheets of yellow, magenta, cyan, and black plates regardless of the number of colors of the original image. To reproduce. As a pigment, a yellow plate is mixed with praseodymium, a magenta plate is mixed with gold, a cyan plate is mixed with cobalt, and a black plate is mixed with manganese. A polyester film is used as a thin film for retaining these, and each plate is printed and photographed in step S23. Obtain a transfer sheet. Next, in step S24, the surface of the photographic transfer sheet is coated with, for example, urethane to form a photographic transfer sheet protective film, and the photographic transfer sheet is completed. The protective film for the photographic transfer sheet prevents the subsequent surface of the photographic transfer sheet from being damaged, and thus contributes to making the surface of the photographic transfer sheet more beautiful and faithfully reproducing the original image after completion of all the steps described below.

Next, as shown in step S10, a photographic transfer sheet is applied to the white attaching portion 3 of the enamel plate with water, and
Let dry for 4 hours. Then, baking for a photo transfer sheet is performed as step S11. This photographic transfer sheet baking step is characterized in that it is performed almost continuously without returning to room temperature with at least two-stage temperature rise characteristics. That is, FIG.
As shown in the figure, the temperature rise characteristic 1 of the first-stage baking in the baking step for a photo transfer sheet is such that the film or ink constituting the above-described baking sheet is completely dissolved, and The temperature rise characteristic 2 of the second-stage baking is for making the photographic transfer sheet vitrified. More specifically, in the first-stage firing, the firing temperature is not rapidly increased, but is increased, for example, to 500 to 600 ° C. per 10 hours per 10 hours.
The temperature rising characteristic is gradually increased at a rate of about 0 ° C., and in the subsequent second stage firing, the temperature rising characteristic is more steep than the temperature rising characteristic of the first stage firing almost continuously without returning to room temperature, for example, The temperature rise characteristic is to raise the temperature to 740 to 760 ° C. in one hour. This is a photo transfer system.
In addition to baking and vitrifying the plate, the process S9
It is difficult to damage the white enamel layer fired in
In addition, there is an effect that the time of the entire firing process is reduced. The maximum temperature in the photographic transfer sheet baking step is T2, for example, T2 is 760 ° C.
Has a relationship of T1> T2 with the baking temperature T1 ゜ C of the glaze of the cover coating described in the above.

In the baking step for a photographic transfer sheet, the film and ink constituting the photographic transfer sheet can be completely dissolved, and the photographic transfer sheet can be baked by vitrification from a particulate state. Experiments have shown that it is possible to settle and reproduce the very fine pictures and patterns. In addition, when the above-described baking step for a photo transfer sheet is not performed, cracks may be generated inside and the beauty of the photo transfer sheet may be impaired. This is because if the baking is stopped near the rising temperature of the first stage baking in the baking process for the photo transfer sheet and returned to room temperature, the base metal sheet has already expanded in the temperature range where enamel glaze and just start to soften, It is considered that a phenomenon that the enamel layer is crushed occurs when the temperature of the base metal sheet is returned to the normal temperature and the expansion of the base metal sheet returns to the original state. This phenomenon does not appear on the surface near the rising temperature of the first stage firing, for example,
When the temperature is increased by about 800 degrees in the main baking of step S16 described below by performing the process without increasing the temperature of the second stage baking, cracks appear inside the enamel layer while the top surface of the enamel layer melts. As described above, the generation of cracks can be prevented by a photographic transfer sheet baking process that is performed almost continuously without returning to room temperature with at least two-stage temperature rise characteristics, and a very beautiful enamel plate with a photographic transfer sheet can be obtained. It became so.

After that, in step S12, the glaze of the cover coating corresponding to the designated surface finish color is overcoated except for the photographic transfer sheet sticking portion 3, and dried in step S13, and then fired at T3 ° C. in step S14. . For example, baked for about 10 minutes by applying a glaze cover coating calcination temperature T3 of about 720 to 740 ° C.
Here, the baking temperature T3 is set to a finish designated color such that the relationship of T1>T2> T3 is established with respect to the maximum temperature T2 in the baking step for the photo transfer sheet and the baking temperature T1 of the glaze of the cover coating described in the step S9. The corresponding cover coating glaze has been selected. Then, step S1
5 or after the above-mentioned baking process for a photo transfer sheet, a flash coating is performed. In order to secure the same luster as the enamel plate and to improve the abrasion resistance of the photo transfer sheet, a transparent glaze is applied to the photo transfer sheet. This is to coat the surface of the part. At this time, the protective film of the photo transfer sheet already coated with urethane is melted and evaporated in the above-described firing step for the photo transfer sheet, and the surface of the photo transfer sheet is polished by the flash coating to provide abrasion resistance. And preserve beauty.

The relationship between the baking temperature T1 of the glaze for the cover coating described in step S9 and the maximum temperature T2 in the baking step for a photographic transfer sheet in step S11 is as follows.
Desirably, when the sintering temperature of the glaze of the cover coating corresponding to the finish designation color in step S14 is set to T3 so that T1> T2, the relationship of T1>T2> T3 is satisfied. By preventing the surface of the cover coating formed in the process from being repeatedly exposed to the firing temperature and being deteriorated, a very beautiful enamel plate with a photographic transfer sheet can be obtained.

In the above-described embodiment, the photographic transfer sheet is baked on an enamel plate serving as an elevator side plate.
The present invention is not limited to the plate-like body, and can be used for enamel members having other shapes.

[0015]

As described above, the method for manufacturing an enamel member according to the present invention comprises applying a glazing for cover coating to a baked enamel member, applying a photographic transfer sheet to the baked enamel member, and drying the enamel member. T1> T2 when the maximum temperature of the baking step for the photo transfer sheet including the baking step for the photo transfer sheet having ascending characteristics is T2 and the baking temperature T1 of the glaze for the cover coating is T1> T2. Can be reliably fixed on the enamel plate, and the deterioration of the surface of the cover coating can be prevented to reproduce an extremely fine picture or pattern.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a manufacturing process according to a method of manufacturing an enamel member according to an embodiment of the present invention.

FIG. 2 is a graph showing a temperature rise characteristic in a sintering step for a photographic transfer sheet according to the method for manufacturing the enamel member shown in FIG.

[Explanation of symbols]

 1, 2 Temperature rise characteristics 3 Pasting section S11 Photo transfer sheet baking process

Continued on the front page (72) Inventor Mitsuo Hanamura 3-14-8 Kitasuna, Koto-ku, Tokyo Inside Hanamura Enamel Industry Co., Ltd. (72) Inventor Hiroshi Goko 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Hitachi Building, Ltd. In system service (58) Field surveyed (Int.Cl. ⁶ , DB name) C23D 5/06

Claims (2)

(57) [Claims] 1. A method for manufacturing an enamel member in which a photographic transfer sheet is attached to an enamel member after applying and baking a glaze of a cover coating, and then drying and baking. The photographic transfer sheet is baked in a photographic transfer sheet baking step having at least two stages of temperature-raising characteristics, the baking temperature of the glaze for the cover coating is set to T1, and the maximum temperature of the photographic transfer sheet baking step is set to T2. When
A method for manufacturing an enamel member, wherein T 1 > T2. 2. The method according to claim 1, wherein after the baking step for the photographic transfer sheet, baking of the glaze of the cover coating corresponding to the designated finish color is performed, and the baking temperature at this time is T3. A method for manufacturing an enamel member, wherein T1>T2> T3.