JPH08276439A - Manufacture of cast artificial marble bathtub - Google Patents

Abstract

PURPOSE: To provide a method for manufacturing a cast artificial marble bathtub of non-gelcoat type having the excellent glossiness and smoothness of a product surface. CONSTITUTION: A method for manufacturing a cast artificial marble bathtub comprises the steps of casting thermally curable resin composition in a mold of male and female combination having an upper mold 2 and a lower mold 1, and thermally curing it, wherein the cast composition is thermally cured in the sequence of the upper edge A of the bathtub of the product face side, the part B except the upper edge and the rear surface side C of the product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cast artificial marble bathtub.

[0002]

2. Description of the Related Art For example, a non-gel-coated cast artificial marble bathtub, which is made of a resin composition obtained by adding a filler to a vinyl ester resin, does not have a gel coat on the mold surface and has excellent gloss and smoothness on the product surface side. In order to manufacture, it is necessary to copy the beautifully polished male (lower) mold surface onto the bath product, and as a result, as shown in FIG. It is pressurized with the airbag 8 and the gasket 7 is made of rubber that can be expanded and contracted, and the lower mold is pushed up and moved to the female mold (upper mold). By setting the mold height to high and the mold height to low, the product surface side of the bath is hardened faster, and the hardening of the back surface of the product is delayed, thereby copying the beautiful mold surface of the lower mold onto the product.

[0003]

SUMMARY OF THE INVENTION In this conventional method,
Since the temperature zone of the lower mold is one system, the curing speed of the upper edge surface and the bottom surface of the bath product is almost the same, and since the resin moves in the direction of shrinkage, the bottom surface adheres more closely to the lower mold. However, there is a drawback that the upper edge surface is inevitably partially peeled off from the lower mold, and the mold surface cannot be completely copied onto the product.

The object of the present invention is to overcome the above-mentioned drawbacks of the conventional method for producing a non-gel coat type cast artificial marble bathtub, and to provide the product surface with excellent glossiness and smoothness.
In particular, it is to provide a method for producing a cast artificial marble bathtub having excellent gloss and smoothness of the upper edge surface of the bathtub which is most important in terms of appearance.

[0005]

Means for Solving the Problems The inventors of the present invention have diligently studied a method for producing a so-called non-gel coat type cast artificial marble bath without gel coating. Based on the composition of the resin composition, the resin composition is poured into a mold that is a male and female combination, and when filling and heating and curing, the beautiful surface of the lower mold on the product surface side, which is important for the appearance of the bath. In order to copy the above, it is effective to divide the order of heating and curing the injected resin composition into three types according to the portion of the bath so as to follow the curing shrinkage of the resin, that is, to make the mold move. I found a thing.

The present invention is a method for manufacturing a cast artificial marble bath in which a thermosetting resin composition is poured into a mold for male and female (upper and lower) and heated and cured, and the injected resin composition is used as a product surface. Side bath upper edge portion, a portion other than the bath surface upper edge portion on the product surface side, and a back surface side of the product, the present invention relates to a method for manufacturing a cast artificial marble bathtub. The present invention achieves the above-mentioned object by setting the order of heating and curing the injected resin composition as described above. The thermosetting resin composition is preferably a vinyl ester resin to which a filler is added and mixed. Then, the surface temperature of the mold, not only to make the lower mold higher than the upper mold, it is preferable to make the temperature of the lower mold bath upper edge portion higher than the portion other than the upper edge portion such as the bath bottom portion, This prevents partial peeling of the upper edge surface from the lower mold, and makes the gloss and smoothness of the product surface uniform on the particularly important upper edge surface.

According to the method, the mold surface is divided into three types of zones according to the temperature, and in order from the one having the highest temperature, (A) the lower edge of the bathtub upper edge, and (B) the lower edge of the bathtub upper edge. The resin composition is heated by the pipes which are connected to the temperature controller independent of each other and the upper mold (C) upper mold (on the back side of the product). Then, in order to control the temperature of only the upper edge portion that is most important in the appearance of the bath tub, it is preferable that the boundary between the A zone and the B zone in the lower mold is located within 10 cm from the upper edge surface of the bath tub. Furthermore, if the thickness of the upper edge of the bathtub is set thinner than the thickness of the bottom, the curing of the upper edge will be completed earlier than the curing of the bottom, and the upper edge will move from the lower mold surface due to the airbag effect. It is preferable because the beautiful mold surface of the lower mold can be copied without peeling.

[0008]

EXAMPLES Examples of the present invention will be described below. FIG. 1 is a cross-sectional view of the periphery of a mold for explaining a method of manufacturing a cast artificial marble bath according to an embodiment of the present invention. The bath is manufactured by first applying a release agent to the surfaces of the lower mold 1 and the upper mold 2 to perform a mold release treatment, and then setting the lower mold 1 and the upper mold 2 together with the reinforcing materials 5 and 6 to set the thickness of the cavity 3. The upper edge 9 mm and the bottom 10
mm. The boundary between the A zone and the B zone (indicated by the alternate long and short dash line in the figure) in the lower mold was set at a position 9 cm from the upper edge surface 13 of the bath. Next, the thermosetting vinyl ester resin composition is degassed in vacuum, and then injected by injection from the injection port 9 into the cavity 3 of the mold. At this time, the resin composition is prevented from leaking from the gasket 7. In order to prevent this, a pressure of 1 kg / cm ² was applied to the airbag 8 and the lower mold 1 was pressed against the upper mold 2.

The resin composition is injected into a mold and filled in the cavity 3, and then the cavity 3 is sealed and the airbag 8 is sealed.
Was increased to 3 kg / cm ² . Immediately after that, hot water for adjusting the temperature of the mold surface was circulated through the pipe 4 of the copper pipe to the three zones A, B and C independent of the respective temperature controllers. The temperature of each part was 110 ° C in the upper edge A zone of the lower mold on the product surface side, 85 ° C in the portion B zone other than the upper edge of the lower mold, and 60 in the upper mold C zone on the back surface of the product. ℃, and after reaching those temperatures in about 5 minutes,
The resin composition was allowed to cure for another 25 minutes under the same temperature conditions to obtain a cast artificial marble bath. In the figure, 10 is a degassing port, 11 is a clamp for fixing a mold, and 12 is a base.

[0010]

According to the present invention, it is possible to manufacture a non-gel coat type cast artificial marble bathtub having excellent gloss and smoothness. That is, by changing the manufacturing method of a high-grade artificial marble bathtub with a gel coat without the gel coat, it is possible to reduce the cost without degrading the quality and to supply the customer at a low cost.

[Brief description of drawings]

FIG. 1 is a schematic sectional view around a mold for explaining a method for manufacturing a cast artificial marble bath according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Lower mold 2 ... Upper mold 3 ... Cavity 4 ... Piping 5, 6 ... Reinforcing material 7 ... Gasket 8 ... Airbag 9 ... Injecting port 10 ... Degassing port 11 ... Clamp 12 ... Base 13 ... Upper edge surface

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Claims (4)

[Claims] 1. In a method for producing a cast artificial marble bath in which a thermosetting resin composition is poured into a mold for male and female (upper and lower) and heated and hardened, the injected resin composition is applied to the product surface side. Bathtub upper edge, the part other than the bathtub upper edge on the product side,
A method for manufacturing a cast artificial marble bathtub, which comprises heating and curing the back side of the product in order. 2. The mold surface is divided into three types of zones according to the temperature, from the highest temperature (A) the upper edge of the lower bath tub, and (B).
The portion of the lower mold other than the upper edge portion of the bath and (C) the upper mold (on the rear surface side of the product), and the resin composition is heated by pipes connected to the temperature controllers independent of each other. Manufacturing method of artificial marble bathtub. 3. The method for producing a cast artificial marble bathtub according to claim 2, wherein the boundary between the A zone and the B zone in the lower mold is located at a position within 10 cm from the upper edge surface of the bathtub. 4. The method for manufacturing a cast artificial marble bathtub according to claim 1, 2 or 3, wherein the thickness of the upper edge portion of the bathtub is set to be smaller than the thickness of the bottom surface portion.