JP3645331B2 - Method for manufacturing enamel member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a hollow member formed by firing a color transfer sheet on the surface.
[0002]
[Prior art]
In general, enamel members are used in various fields such as elevator car side plates, taking advantage of the robustness and design superiority of enamels. For example, enamel plates are used in Japanese Patent Application No. 3-332816. A method of manufacturing an elevator car side plate has been proposed.
This type of conventional enamel member is made by forming a base metal plate having a predetermined thickness into a predetermined shape by a can making operation, performing surface treatment such as degreasing and pickling on the surface, and then performing nickel plating, The 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 first coated with a glaze and dried, and then the second stage is coated with a glaze and dried. In the third stage, the glaze is overcoated, dried and baked.
[0003]
On the other hand, Japanese Patent Application Laid-Open No. 5-318990 describes that a color photographic transfer sheet is baked on the surface of a pottery or the like in order to enhance the aesthetics and design of the surface of the pottery or the like.
[0004]
[Problems to be solved by the invention]
The inventors of the present invention examined firing a color photographic transfer sheet on the surface of a hollow member in order to give a high-class design feeling to the hollow member. However, based on past experience, a photographic transfer sheet is pasted on the enamel member surface, and after drying, the firing temperature is increased to 400 to 550 ° C. over 4 to 5 hours at a temperature increase rate of 100 ° C. per hour. After firing and returning to room temperature, the temperature was rapidly increased to 650 to 800 ° C. on the order of minutes, and the main firing was carried out. However, it was found that an extremely fine photographic image could not be reproduced.
[0005]
An object of the present invention is to provide a method for producing an enamel member that can reproduce an extremely fine color photographic image using a photographic transfer sheet.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for producing a hollow member in which a hollow layer is fired on the surface of a substrate member, a photographic transfer sheet is pasted thereon, dried and fired, and the photographic transfer sheet is pasted. After applying the white coating cover to the pasting part to make it white, the above-mentioned photographic transfer sheet is fired in a first-stage firing having a moderate temperature rise characteristic and this first-stage firing without returning to room temperature. Thus, the second stage firing is performed at a temperature higher than that of the first stage firing .
[0007]
In the method for manufacturing an enamel member according to the present invention, the above-mentioned base member is coated with a white cover coating, and the photographic transfer sheet is baked, so that the color of the photographic transfer sheet is ensured without being affected by the cover coating. It is now possible to reproduce very fine pictures and patterns.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a method for manufacturing a hollow plate as a hollow member according to an embodiment of the present invention. In the figure, the left side shows a photographic transfer sheet manufacturing process, and the right side shows a hollow plate manufacturing process and a subsequent step of baking the photographic transfer sheet on the enamel plate. First, the production of the 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 performing surface treatment such as washing, nickel plating is performed in step S3, and then, as a first stage baking operation, a ground coating glaze is primed on the surface of the nickel-plated base metal plate in step S4, After drying in step S5, baking is performed at about 800 ° C. as step S6. This ground coating is usually black. Then the fired working second stage, is dried as a step S8 Shi coating medium glaze white coating covers at step S7, the Firing 5 to 10 minutes at about 800 ° C as a step S9.
[0009]
On the other hand, in the photographic transfer sheet manufacturing process, a photographic print or negative or positive film is prepared in advance as step S20, and this is subjected to trimming color separation in step S21. In other words, an original image prepared as a photographic print, negative or positive film is separated into three primary colors (yellow, magenta, cyan) and black. Thereafter, in step S22, trimming color separation is performed to obtain a plate making, which is a uniform four sheets of yellow, magenta, cyan, and black plates regardless of the number of colors of the original image. To reproduce. The yellow plate is praseodymium, the magenta plate is a metallurgy, the cyan plate is cobalt, the black plate is mixed with manganese, the polyester film is used as a thin film to hold them, and each plate is printed and photographed in step S23. Obtain a transfer sheet. Next, in step S24, for example, urethane is coated on the surface of the photographic transfer sheet to form a photographic transfer sheet protective film, thereby completing the photographic transfer sheet. Since this photographic transfer sheet protective film prevents the surface of the photographic transfer sheet from being scratched thereafter, the photographic transfer sheet protective film contributes to more beautiful reproduction of the surface of the photographic transfer sheet after the completion of all the steps described below and faithful reproduction of the original image.
[0010]
Next, as shown in step S10, the photographic transfer sheet is affixed with water to the affixing portion 3 where the enamel plate is whitened by the white coating cover 4, and dried for 24 hours. Then, baking for photographic transfer sheets is performed as Step S11. This photographic transfer sheet firing step is characterized by being carried out almost continuously without returning to room temperature with at least two stages of temperature rise characteristics. That is, as shown in FIG. 2, the temperature increase characteristic 1 of the first stage baking in the photographic transfer sheet baking step is that the film and ink constituting the photographic transfer sheet described above are completely dissolved. The temperature rise characteristic 2 of the second stage baking in the baking process is that the photographic transfer sheet is baked and vitrified. More specifically, in the first stage firing, the firing temperature is not rapidly increased, but is gradually increased at a rate of about 100 ° C. per hour from 500 to 650 ° C. over 5 hours, for example. In the subsequent second stage firing, the temperature rise characteristic is substantially more rapid than the temperature rise characteristic of the first stage firing in the subsequent second stage firing, for example, a temperature rise that increases to 700 to 800 ° C. in one hour. It is characteristic . Increasing the temperature of the second stage calcination of this may be the thickness of the base metal plate 0.5mm and a 1.6mm in which Great 740~ 760 ° C that is commonly used as the side plate elevators, the condition of the base metal plate It is good to decide in consideration of
[0011]
Thereafter, overcoated with a glaze that corresponds to the finishing designated color of the surface except the attaching portion 3 adhered Photo transfer sheet in step S12, about 10 minutes after drying the step S13 as a step S14 at approximately seven hundred twenty to seven hundred forty ° C or Bake. Thereafter, a flux coating is performed after the step S15 or the above-described calcination process for the photographic transfer sheet. For the purpose of ensuring the same gloss as the enamel plate and improving the abrasion resistance of the photographic transfer sheet, a transparent glaze is used. The surface of the photographic transfer sheet is coated. At this time, the protective film of the photographic transfer sheet already coated with urethane is melted and evaporated in the above-mentioned baking process for the photographic transfer sheet, and the surface of the photographic transfer sheet is polished by the flax coating to provide wear resistance. And can retain beauty.
[0012]
This baking process for a photographic transfer sheet completely dissolves the film and ink constituting the photographic transfer sheet, and also allows the photographic transfer sheet to be baked by vitrification from a particulate state, while fixing the photographic transfer sheet Experiments have revealed that it is possible to reproduce such fine pictures and patterns. Further, when the above-described calcination process for a photographic transfer sheet is not performed, cracks may occur inside and the beauty of the photographic transfer sheet may be impaired. This is because the base metal sheet has already expanded in the temperature range where the enamel glaze just begins to soften when the baking is stopped near the rising temperature of the first stage baking in the baking process for the photographic transfer sheet and returned to room temperature. This is considered to be due to the phenomenon that the enamel layer is crushed when the expansion of the base metal sheet is restored to the normal temperature. This phenomenon does not appear on the surface in the vicinity of the rising temperature of the first stage baking, for example, when the process is advanced without increasing the temperature of the second stage baking and a temperature of about 800 degrees is applied in the main baking of step S16. The top surface of the enamel layer melts and cracks appear inside. However, as described above, cracks are generated by the baking process for photographic transfer sheets that is performed almost continuously without returning to room temperature with at least two stages of temperature rise characteristics. Can now be prevented. Moreover, since the white transfer cover 4 is used as the photographic transfer sheet affixing portion 1a on the enamel plate, the photo transfer sheet can reproduce the color of the original image more faithfully and obtain a very beautiful enamel plate with a photo transfer sheet. Can now.
[0013]
In the above-described embodiment, the photographic transfer sheet is fired on the enamel plate serving as the elevator side plate. However, the photo transfer sheet is not limited to the plate-like body, and can be employed for enamel members having other shapes.
[0014]
【The invention's effect】
As described above, the enamel member manufacturing method according to the present invention uses a white cover as a base coating cover on which the photographic transfer sheet is pasted, so that the photographic transfer sheet more faithfully reproduces the color of the original image and the finely detailed picture or pattern. Etc. can be reproduced, and a very beautiful transfer can be performed.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a manufacturing process according to a method for manufacturing a hollow member according to an embodiment of the present invention.
FIG. 2 is a temperature rise characteristic diagram of a photographic transfer sheet baking step according to the enamel member manufacturing method shown in FIG. 1;
[Explanation of symbols]
1, 2 Temperature rise characteristics 3 Pasting part 4 Coating cover S11 Baking process for photographic transfer sheet

Claims (1)

In the manufacturing method of the enamel member that bakes the enamel layer on the surface of the substrate member, pastes the photographic transfer sheet thereon, and dries and bakes it, the pasting portion to which the photographic transfer sheet is pasted is applied with a white coating cover. After the whitening, the photographic transfer sheet is fired more rapidly than the first stage baking after the first stage baking having a moderate temperature rise characteristic and the first stage baking without returning to normal temperature. A method for producing an enamel member, characterized in that the second stage firing is performed to raise the temperature .

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