JPS5839914B2 - Mikagei Shichiyo Mono Hollow - Seihin no Seizou Hohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a leg-shaped stone-like cast enamel product, and is particularly useful for producing a leg-shaped stone-like cast enamel bathtub.

Traditionally, natural granite was cut into flat plates to make leg-shaped stone-like bathtubs.
It is conceivable to join these flat plates into a bathtub shape, or to mold them from glass fiber reinforced plastic and give them a leg-shaped stone-like pattern, but in the former case, it is very difficult to cut out the top plate from natural stone. The flat plates are easily damaged during transportation, and when the bathtub is used for a long period of time, water tends to flow shallower than the joints of the flat plates.

In the latter case, since it is made of plastic, the surface hardness is not sufficient and it is easily scratched, and when the water is boiled too much, the plastic tends to change and deteriorate.

In view of the current situation, it has been desired to create a durable cast enamel bathtub with a leg-shaped stone pattern, but the technology to create a granite pattern has not been established, and the development of an industrial manufacturing method remains unresolved. It was left as is.

The present invention provides an industrial method for manufacturing a leg-shaped stone-like cast enamel bathtub, and one embodiment thereof will be described below.

As shown in Fig. 1, the casting bathtub base 1 is
After heating to a high temperature of 0'C, take out from the heating furnace, and at least two pieces of white frit 21 having a Munsell lightness of N-6 or higher and having almost the same coefficient of thermal expansion as the casting body 1 are placed on the casting body 1.
By heating and fusing at 900 to 950'C, a white hollow layer 2 is formed, and then taken out from the furnace.
While the temperature of the white enameled first layer 2 is maintained at a high temperature of 800 to 900°C, the Munsell brightness N is applied to the white enameled first layer 2.
- 6 or less black, brown or gray colored interglazes 3, 31 or 32, each alone or mixed in a ratio of 1 part black, 5 parts brown, 5 parts gray, and sprinkled with it in spots, Then, when heated at 900 to 950°C for 30 seconds to 3 minutes to fuse it onto the white enamel layer 2, the colored component 4 dissolved or dispersed in the colored transparent glaze 3, 31 or 32 is shown in Figure 2. As shown, it does not spread uniformly and is fused leaving uneven shading on the white hollow layer 2.

Therefore, the underlying white hollow layer 2 is visible through the colored transparent glaze, which has uneven shading, and a pattern similar to that of natural legstone appears.

In this case, if the opaque black or brown glaze is used, the underlying white enamel layer will not be visible when it is fused, so as shown in Figure 3, a pattern 5 of large and small black or brown spots is painted on the white background. The pattern will be the same as when it is attached,
It is not possible to express the natural leg-shaped stone pattern.

In addition, the above-mentioned black or brown patterned glaze is simply dotted and fused onto the white enamel layer.
Unlike the case of a single layer of white enamel, there is no problem even if the coefficient of thermal expansion is not equal to that of the casting base, so there is no trouble in preparing the patterned glaze.

However, this patterning requires a short heating time of 30 seconds to 3 minutes.

The reason is that if heated at a high temperature of 900 to 950°C for more than 3 minutes, the white frit on the base will melt again, and the patterned material will mix with the glaze, which may prevent the desired leg-shaped stone pattern from appearing. Because there is.

In addition, although the case of the enamel baking by the dry method was demonstrated above, this method can be implemented similarly in the case of the enamel baking by the wet method.

The method of the present invention is not only suitable for manufacturing cast enamel bathtubs, but also for kitchen utensils such as cooking tables, coffee pots, pans, and seasoning containers, sanitary appliances such as wash basins, station name signs,
For manufacturing various enamel products such as for signboards such as direction boards, dial boards, and name plates, for combustion appliances such as rice cookers and stoves, for parts such as electric refrigerators, and for construction materials such as interior and exterior panels of buildings. Applied.

The method of the present invention is as explained in detail above, and a colored transparent glaze is sprinkled on a layer of white enamel to form a pattern such as black or brown, and heated at 900 to 950°C for 30 seconds to 3 minutes. This method is advantageous as an industrial production method because it is an extremely simple method of simply fusing a colored transparent glaze onto a layer of white enamel.

Furthermore, as mentioned above, the patterned glaze is extremely easy to prepare.

Furthermore, the leg-shaped stone-like bathtub obtained by the method of the present invention does not require the troublesome work of cutting out a flat plate, unlike a bathtub made of flat natural granite plates, and there is no risk of dust pollution that accompanies the work of cutting flat plates. There is no risk of shallow water at the joint between flat plates, and since it is an enamel product,
Its durability is excellent.

On the other hand, the surface hardness is higher than that of glass fiber-reinforced plastic bathtubs, so it does not get scratched and does not deteriorate even if the water is boiled too much.

Moreover, its leg-shaped stone-like pattern can create an excellent design that is extremely similar to natural stone.

Furthermore, when the single layer of enamel found in conventional enamel bathtubs, which has a single color all over the entire surface, has spots due to dust in the air during manufacturing, the bathtub is treated as a defective product. However, when manufactured by the method of the present invention, even if spots due to dirt and dust occur, they become less noticeable, and there are no so-called semi-quality products.

However, since bathtubs are always box-shaped, in conventional bathtubs with a single color, light is refracted on one or two sides of the enamel tank, which emphasizes the unevenness of the surface of the enamel and causes halation randomly. Although it was not practical, if the method of the present invention is used, the unevenness of the enamel surface will be hidden by the optical bright and dark areas by the colored bright and dark areas of the enamel surface of the present invention, creating a visual illusion. This also has the effect of making the surface appear completely smooth. Conventionally, the production furnace time was lengthened to smooth the enamel layer, but with the present invention, this time can be shortened, and the furnace time can be shortened. Its industrial value is significant as it reduces electricity costs and increases production efficiency by shortening time.

Moreover, if the surface of the colored transparent glaze is covered with a thin transparent frit layer (not shown), the effect will be further enhanced.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view for explaining the state in which a black or brown patterned colored transparent glaze is fused to a single layer of white enamel on a casting base, and Figure 2 is a cross-sectional view showing the state in which the patterned layer of the present invention can be obtained by using a colored transparent glaze. Explanatory diagram showing the generation state of the granite pattern, Part 3
The figure is an explanatory diagram showing how a pattern is formed using an opaque glaze. In the figure, 1 is a casting base, 21 is a white frit, 2 is a single layer of white enamel, 3, 31 and 32 are colored transparent glazes,
4 is a colored component in a colored transparent glaze, and 5 is a spotted pattern created by an opaque glaze.

Claims (1)

[Claims] 1. After baking a white frit with a Munsell brightness of N-6 or higher on a casting base, sprinkle black, gray or brown colored transparent glaze with a Munsell brightness of N-6 or lower in spots on the frit, and heat at 900 to 950°C for 30 seconds. A method for producing a leg-shaped stone-like cast enamel product, which is characterized by producing a leg-shaped stone-like pattern by heating the white enamel for 3 to 3 minutes and fusing the white enamel while leaving uneven shading on the layer.