JPH064919B2 - Dry multi-color glazing method for hollow bath - Google Patents

Description

The present invention relates to a dry multi-colored glaze method for an enameled bath.

Glazing methods for enamel products include a wet method in which glaze dissolved in water is sprayed onto the substrate by spraying or the like and baked at about 900 ° C, and a dry method in which glaze powder is sprinkled and fused to the substrate heated to about 900 ° C. To be The former is mainly used for thin steel products with a small heat capacity, while the latter is mainly used for thick cast products with a large heat capacity. The reason is,
Since thin steel plates are easy to cool, they are not suitable for the dry method in which the glaze is fused by the amount of heat held by the base material.Since the casting contains a large number of minute voids in its structure, the wet method causes pinholes. Because it is easy, a cast product manufactured by the dry method, which has a heavy weight, is rigid and has a large heat capacity, is mainly used as an enameled bath.

By the way, in recent years, daily necessities have become colorful, and enamel products have come to have various color patterns, which is no exception. However, even if this enamel product is made by the wet method, it is possible to make the color relatively easy by masking etc., but if it is made by the dry method, the glaze powder is sprinkled and fused on the heated substrate as described above. , If you want to give a different color range to this, you can only sprinkle another glaze powder on the base color layer and fuse it as well, so if you try to set different color zones on the top and bottom of the inner wall of the bathtub, sprinkle It was extremely difficult in work to make the boundaries uniform because the glaze powder was scattered, and it was inevitable that the boundaries of the finished different-colored zones wavy irregularly. Therefore, a combination of different colors with high contrast makes this non-uniform boundary part clearly visible, which significantly reduces the commercial value thereof.Therefore, in the cast iron enamel bath by the dry method, it is different from the different colors. Even so, it is limited to those of similar colors and of relatively close lightness, so it cannot be denied that there is still insufficientness to meet the needs of recent years.

The present invention has been made in view of the above circumstances, in the multi-color glaze cast iron enameled bath by a dry method, forming a flat inclined portion from the upper flange edge of the bath to the inner wall, the flange edge with a different color area In addition, by making the inclined portion a rough mixed color gamut, it is possible to solve the above-mentioned problems in work and to combine different colors with high contrast, further increasing the commercial value of such cast iron enamel bathtub. It was made as a contribution.

An embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a schematic flow chart 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 a partially enlarged vertical section of the bathtub. It is a side view. That is, the gist of the present invention is a dry glazing method for a enamel bath which sprinkles a glaze powder on a heated cast iron bath to form a fusion layer of the glaze on the bath surface. A step [I] of forming a flat inclined portion 13, a step [II] of applying a first glaze 20 to the entire inner surface of the bath 1 under heating to fuse the solid base color layer 2 [II], Subsequently, a step [III] of applying the second glaze 30 on the base color layer 2 of the flange edge 11 to fuse the solid different color layer 3 and finally, on the base color layer 2 of the inclined portion 13. The second glaze 30 or the third glaze is coarsely applied to the
[IV] of fusing, and a dry multicolor glazing method for an enamel bath.

Each step will be described in more detail. In step [I], a gray cast iron bath 1 having a thickness of 3 to 7 mm is obtained by a normal casting machine A. At this time, the flange edges 11 on each of the four sides of the bathtub 1 ...
From the inner wall 12 to the inner wall 12, a flat inclined portion 13 having an inclination angle α = 30 to 50 ° and a width of about 20 to 130 mm is simultaneously formed (see FIGS. 2 and 3). And this slope 13 ...
Are simultaneously chamfered with a curvature of 10 to 50 mm at the transition portion between the flange edge 11 and the transition portion between the inclined portion 13 and the inner wall 12.

In the step [II], the cast bath 1 is heated to 950 to 97.
It is held in the heating furnace B maintained at 0 ° C. for 10 to 13 minutes to heat it to about 880 ° C., and the bathtub 1 taken out from the heating furnace B is tilted while swirling immediately.
The first glaze powder 20 of 0 mesh or less is sprinkled on the entire inner surface of the bathtub 1. If the temperature of the bathtub 1 drops during the sprinkling work, the fusion efficiency will decrease, so sprinkling should be performed as quickly as possible, and the bathtub 1 should be reheated to near the above temperature, and this cycle should be repeated about 3 times. The base color layer 2 having a thickness of 0.5 to 2.0 mm is fused with the glaze powder 20 of FIG. At the time of the third sprinkling, the frequency of the shifter C is adjusted with respect to the flange edge 11 to reduce the sprinkling amount. This is to make the total thickness of the different color layer 3 formed in the next step substantially constant. Also, in this type of glaze method, it is well known that it is desirable to make the sprinkling angle of the powder substantially perpendicular to the surface to be glazed in order to improve the adhesion efficiency. It is essential to tilt the bathtub 1 appropriately so that it is substantially perpendicular to the direction.

In the step [III], the second glaze powder 30 is sprinkled and applied to the flange edge 11 of the bathtub 1 on which the base color layer 2 is fused on the entire surface as described above, and the different color layer 3 is fused. . Further, in the step [IV], the second glaze powder 30 is roughly sprinkled on the inclined portion 13 to form the mixed color layer 4 having a spot pattern. When the glaze powder 30 is sprinkled on the inclined portion 13, since the inclined portion 13 forms a surface area different from the inner wall 12, the powder 30 sprinkled on the inclined portion 13 substantially at right angles to the inner wall 12. Since there is almost no adhesion, the worker can visually recognize the transitional portion between the inclined portion 13 and the inner wall 12 as the sprinkling boundary portion, and aiming at that, the sprinkling of the powder 30 on the inner wall 12 is minimized. Therefore, the proper position of the shifter C can be easily determined, and accordingly, the speckled pattern of the mixed color layer 4 is applied in a substantially uniform blur shape on the inclined portion 13 without affecting the inner wall 12. Moreover, even if the lower boundary line of the mixed color layer 4 is slightly wavy, it is offset by the shape effect of the rounded chamfered transition portion, and the boundary line does not cause any discomfort. This suggests that as the color tones of the base color layer 2 and the different color layer 3 (mixed color layer 4), it is possible to adopt those having a great difference in hue, brightness, etc. In addition, the different color layer 3 can be made to have the same dark color as that of the different color layer, or both of them can have different hues. Due to the contrast effect of the mutually different colors, a vivid two-tone color that has never existed in this kind of enamel bath is available. You can get a new bathtub that is full of fashion. By the way, according to the conventional method, when the brightness difference (V value) is set to 1 or more, the irregular undulation of the boundary line is clearly visible, so that the commercial value thereof is remarkably reduced. There was no discomfort.

In addition, it is possible to further improve the color effect by adopting a glaze powder having a third color tone different from the first and second glaze powders 20 and 30 as the glaze powder forming the mixed color layer 4. Is. The slope 13
On the other hand, when the glaze powder is sprinkled from above, the powder particles are fused while sliding down on the inclined portion 13, whereby a so-called flow pattern is revealed and a new pattern effect is obtained. Therefore, it is preferably adopted as in the above. Further, the transition portions of the inclined portion 13 and the flange edge 11 and the inner wall 12 are rounded and chamfered as described above. However, if this is simply cut, the molten glaze is heated during the hardening process of the material. This is because cracks are likely to occur due to the difference in shrinkability, and the glaze melted at the edge may cause so-called sagging. Therefore, when such concerns are resolved by other means, the cut shape The slanted portion processed in (1) is preferably used because both side boundaries are clearly visible, which is advantageous in workability and has an effect of widely sensing the inside of the bath.

As described above, in the method of the present invention, a flat inclined portion is formed from the flange edge of the bathtub to the inner wall, and at this inclined portion, a mixed color layer that transfers from the base color layer of the inner wall to the different color layer of the flange edge is formed. Since the glaze powder is sprinkled and applied, the sprinkling target of the glaze powder to be sprinkled on the slope is clear, and accurate glaze is promised, and the glaze powder sprinkled almost at right angles to the slope is angled. Of the mixed color layer and the base color layer can be finished in a uniform straight line without the irregular wavy shape as in the conventional case. As a result, even if different hues and lightnesses are given to the different color layer and the base color layer, it does not cause any discomfort, and it is possible to introduce a fashionable and progressive enamel tub and by combining various colors. The appearance and depth of the bathtub are enhanced and the bathing sensation is further enhanced. Such an advantage greatly contributes to increasing the commercial value of this cast iron enamel bath, and is achieved by an extremely simple method. Therefore, the industrial utility of the method of the present invention is extremely large. It can be said that there is.

[Brief description of 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. 3 is a partially enlarged vertical sectional view of the bathtub. (Explanation of reference numerals) 1 ... Bathtub, 11 ... Flange edge, 12 ... Inner wall, 13 ... Inclined portion, 2 ... Basic color layer, 20 ... First glaze powder, 3 ... Different color layer, 30 ... Second glaze powder, 4 ... Mixed color layer.

Claims (3)

[Claims] 1. A dry glazing method for a enamel tub in which a glaze powder is sprinkled on a heated cast iron tub to form a fusion layer of the glaze on the surface of the tub. A step of forming, a step of applying a first glaze to the entire inner surface of the bath under heating to fuse a solid base color layer, and subsequently a second glaze on the base color layer of the flange edge. And a step of fusing a solid different color layer by fusing, and finally applying the second glaze or the third glaze coarsely on the base color layer of the inclined portion to form a blurred mixed color. A dry multicolor glazing method for an enameled bath, comprising the steps of fusing layers. 2. The method according to claim 1, wherein the mixed color layer has a speckled pattern. 3. A method according to claim 1, wherein the mixed color layer is flow-patterned.