JPS60125381A - Dry multicolor glazing method of enameled bathtub - Google Patents

Abstract

PURPOSE:To perform easily linear dry multicolor glazing with a uniform boundary part by sprinkling glaze powder to the flat inclined part formed from the upper flange edge of a cast iron bathtub toward the inside wall and forming a mixed color layer by melt sticking. CONSTITUTION:A flat inclined part 13 is formed from the upper flange edge toward inside wall 12 of a cast iron bathtub 1. The bathtub 1 is heated to about 880 deg.C in a heating furnace, etc., and the 1st glaze powder is sprinkled over the entire inside surface of the bathtub 1 and a solid base color layer 2 is melt-stuck thereto. The 2nd glaze powder is sprinkled on the base hue 2 of the flange edge 11 to form a solid different color layer 3. The 3rd glaze is applied coarsely on the layer 2 of the part 13 and a mixed color layer 4 in a blurred, speckled pattern, flow pattern or other shape is melt-stuck thereto. The bathtub 1 is adequately tilted so as to make the sprinkling angle approximately perpendicular to the surface to be glazed in the stage of sprinkling the above-mentioned glaze, by which the efficiency of sticking the glaze powder is improved and the sticking to the other surface is prevented as far as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry multicolor glazing method for an enamel bathtub.

The glazing methods for enamel products include the wet method, in which glaze dissolved in water is sprayed onto the base material and baked at approximately 900°C, and the dry method, in which glaze powder is sprinkled onto the base material heated to approximately 900°C and fused. One example is the law. The former is mainly used for thin-walled steel plate products with a small heat capacity, while the latter is mainly used for thick-walled cast products with a large heat capacity. The reason for this is that thin-walled steel sheets cool easily, so they are unsuitable for the dry method, in which the glaze is fused using the thermal energy of the base material, and the wet method is not suitable for castings, which contain many microscopic voids within their structure. This is because pinholes are likely to occur, and as enamel bathtubs, products cast using the dry process are mainly awarded because they have a heavy feel, are rigid, and have a large heat capacity.

By the way, in recent years, household goods have become more colorful, and enamel products are no exception, with a variety of color patterns now available. However, when using the wet method, it is possible to make this HO O-a product relatively multicolored by masking, etc., but when using the dry method, it is necessary to sprinkle glaze powder on the heated substrate as described above. ]If you want to add a different color range to this layer by sprinkling it and fusing it, the only way to apply it is to sprinkle another glaze powder on top of the base color layer. If you try to create a unique zone,
It is extremely difficult to make the boundaries uniform because the glaze powder that is sprinkled scatters, and it is inevitable that the boundaries between the finished different colored zones will be irregularly wavy.

Therefore, a combination of different colors with a large contrast will make this uneven boundary visible and will significantly reduce its commercial value. Although unique colors are limited to similar colors with relatively similar brightness, it cannot be denied that they are still insufficient to meet the needs of the past.

The present invention was made in view of the above circumstances, and when applying multicolor glaze to a cast iron enamel bathtub using a dry method, a flat sloped portion is formed from the upper flange edge of the bathtub to the inner wall, and the flange edge is colored in a unique color. By making the sloping area a rough mixed color gamut, the above-mentioned operational problems are solved, and it is possible to combine different colors with a large contrast, further increasing the commercial value of the cast iron enamel bathtub. This was done in order to contribute to increasing the

Embodiments of the present invention will be described based on the accompanying drawings. FIG. 1 is a schematic flowchart of the method of the present invention, FIG. 2 is a perspective view of a bathtub obtained by the method of the present invention, and FIG. 8 is a partially enlarged longitudinal section of the bathtub. It is a front view. That is, the gist of the present invention is to provide a dry glazing method for an enamel bathtub in which a fused layer of glaze is formed on the bathtub surface by sprinkling glaze powder onto a heated cast iron bathtub. 12 to form a flat sloped portion 18; and a step (If) of applying a first glaze gOt- to the entire inner surface of the bathtub l under heating to fuse the solid base color layer 2. Next, a second glaze 80 is applied on the base color layer 2 of the flange edge 11 to fuse the solid different color layer 3, and finally, the base color layer 2 of the inclined portion 13 is applied. A step (N) of roughly applying the second glaze 80 or the third glaze to fuse the blurred mixed color layer 4 thereon. It has a multicolored glaze.

To explain each step in more detail, in step CI), a gray cast iron bathtub I having a thickness of 8 to 7 IIJI is obtained using a normal casting machine A. At this time, an inclination angle α-B O
~, 500% width of about 20~1BOn flat sloped part 13・
. . . are formed at the same time (see FIGS. 2 and 8). The transition portion between the inclined portion 18... and the flange edge 11... and the transition portion between the inclined portion 1B... and the inner wall 12 have a curvature lθ~5 (1+a+ radius chamfering process). done at the same time.

In step (II), the fabricated bathtub l is heated to 950 to 9
Heat it to about 880°C by keeping it in heating furnace B maintained at 70°C for 10 to 13 minutes, put it in heating furnace B, and apply 60 mesh of first glaze powder 20 to the inner surface of bathtub l using shifter 0. Sprinkle over the entire area. [Furi-kake] is in the bathtub while working.
If the temperature force is lower than the lower blade, the fusion efficiency will decrease, so sprinkle as quickly as possible and reheat the bathtub to bring it back to around the above temperature. Repeat this cycle for about t-8 to complete the first process. Thickness 0.5~'2. due to glaze powder 20. ．．
The base color layer 2 of 0WnlAll is fused. For the 8th sprinkle, adjust the frequency of the theater 0 to [1lII] for the flange edge 11...K, and reduce the amount of sprinkle.

This is to make the total thickness with the different color layer 8 formed in the next step almost constant. In addition, in this type of glazing method, it is well known that it is desirable to sprinkle the powder almost at right angles to the surface to be glazed in order to increase adhesion efficiency. Force to tilt the bathtub 1t-appropriately so that it is almost perpendicular to the direction of fall! It is essential.

In the step [Seal], the second glaze powder 8o is sprinkled in the same manner as above on the flange &111 of the bathtub l, on which the base color layer 2 is fused to the entire surface as described above, to form a different color layer 8f:
fuse. Further, in step (W), the second glaze powder 8o is roughly sprinkled on the inclined portion 13 to form a mixed color layer 4 in a spotted pattern. When the glaze powder 8o is sprinkled on the sloped part 18, since the sloped part 18 constitutes a different area from the inner wall 12, the powder 8o sprinkled almost at right angles to the sloped part 18 is applied to the inner wall 12.
Moreover, since the worker can visualize the transition part between the slope part 13 and the inner wall 12 as the boundary part, the powder 8o is sprinkled onto the inner wall 12 with this as the target. It is possible to easily determine the appropriate position of the shifter 〇 so as to minimize the overhang, and therefore the spotted pattern of the mixed color layer 4 is applied almost uniformly on the slope 13 without spreading to the inner wall 1g. be done. Moreover, even if the lower boundary line of the mixed color layer 4 is somewhat wavy, it is canceled out by the shape effect of the rounded chamfered transition part, and the boundary line does not give an unnatural feeling.

This suggests that the base color layer 2 and the different color layer 8 (mixed color layer 4) can have vastly different hues, lightness, etc.; for example, the base color layer 2 can be made light. When it comes to coloring, the different color layer 8 can be colored in the same deep color as the different color layer 8, or both can be made in different hues.The contrast effect of these mutually different colors creates a clear two-tone color that is unprecedented in this ring enamel bathtub. This makes it possible to obtain a bathtub with a fashionable and innovative color.Incidentally, according to the conventional method, when the brightness difference (V value) is set to 1 or more, the irregular undulations of the border line are clearly visible. However, the above method did not cause the same sense of discomfort even in cases 1-4.

Furthermore, it is possible to further improve the color effect by employing the above-mentioned first and second glaze powders go and a third glaze powder having a different tone from go as the glaze powder forming the mixed color IWII4. be. Furthermore, when sprinkling the glaze powder on the sloped part 18, if it is sprinkled diagonally upward, the powder particles will slide down and fuse together on the sloped part 18, thereby creating a so-called flow pattern. Since a new pattern effect can be obtained, this method is preferably adopted as above. Furthermore, the inclined portion 13 and the flange edge 11
As mentioned above, the transition areas with the inner wall 11 are rounded and chamfered, but this is because if the glaze is simply cut, the molten glaze will crack during the hardening process due to the difference in heat shrinkability of the materials. This is because the melted glaze may easily form on the edges, causing so-called sagging].Therefore, if such concerns can be resolved by other means,
The cut-shaped sloped portion is advantageous in terms of workability since the boundaries on both sides can be clearly seen, and it has the effect of making the inside of the bathtub feel larger, so it is preferably employed.

As described above, in the method of the present invention, a flat sloped portion is formed from the flange edge of the bathtub to the inner wall, and in this sloped portion, a mixed or golden layer that transitions from the base color layer on the inner wall to the different color layer on the flange edge is formed. Add each dog medicine powder to form wR11.
Since the glaze is applied, the target of the glaze powder that should be sprinkled on the slope becomes clear, ensuring accurate glaze application, and the glaze powder is sprinkled at right angles to the slope. The glaze powder is difficult to adhere to inner walls having different angles, so that the boundary between the mixed color layer and the base color layer can be finished in a uniform straight line without producing the irregular undulations that are conventional. As a result, even if the different color layer and the base color layer are given different hues and lightness, the same sense of discomfort will not occur, making it possible to create a fashionable and innovative enamel bathtub, as well as a variety of colors. The combination of strings enhances the depth and three-dimensional appearance of the bathtub, making the bathing experience even richer. These advantages greatly contribute to increasing the commercial value of this type of cast iron enamel bathtub, and are achieved by an extremely simple method, so the method of the present invention has great industrial utility. It can be said that it is large.

[Brief explanation of the drawing]

FIG. 1 is a schematic flowchart of the method of the present invention, FIG. 2 is a perspective view of a bathtub obtained by the method of the present invention, and FIG. 3 is an enlarged vertical sectional view of a portion of the bathtub. (Explanation of symbols) 1... Bathtub, 11... Flange edge, 12... Inner wall, 13... Inclined part, 2... Base color layer, 20... First glaze powder, 3 ...Different color layer, 30...Second glaze powder, 4...Mixed color layer. One or more Patent Attorneys (6285) Hidehiko Matsuno Figure 1 [1] [1' 1 [Phantom (B)]

Claims (1)

[Claims] 1. In the dry glazing method for enamel bathtubs, which involves sprinkling glaze powder onto a heated cast iron bathtub to form a fused layer of glaze on the bathtub surface, a flat glaze is applied from the flange edge of the top of the bathtub to the inner wall. forming a sloped portion; applying a first glaze to the entire inner surface of the bathtub under heat to fuse a solid base color layer; A step of applying a second glaze to fuse a solid different color layer, and finally a step of roughly applying the second glaze or a third glaze on the base color layer of the sloped part. A dry multicolor glazing method for an enamel bathtub, characterized by comprising a step of fusing a blurred mixed color layer. & Claims in which the mixed color layer has a spotted pattern @
The method described in Section 1. 8. F-book? The method according to item 1, i.