JPH04364907A - Manufacture of artificial marble or the like - Google Patents

Abstract

PURPOSE:To manufacture a good quality product efficiently by making a film of good releasing properties adhering to mold faces of male and female molds and carrying out molding. CONSTITUTION:A film F of good releasing properties is made adhere to the mold faces of a male mold 1 and a female mold 10, and an artificial marble raw material paste is injected and overheat cured. The film F can be selected properly correspondingly to the material quality of the artificial marble material, and for example, polyvinyl alcohol, cellophane, polypropylene, chloropylene rubber or the like is suitable. As the film F of good releasing properties is made adhered to the mold faces of the male and female molds, the film F works as a cushion to make the shrinkage due to curing of the raw material paste even and prevent the generation of cracks and spaces.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing kitchen sinks, washroom bowls, bathtubs, etc. by casting artificial marble.

0002

[Prior Art] This type of sink is made by mixing acrylic resin or polyester resin with inorganic fillers such as aluminum hydroxide, glass, silica, calcium carbonate, etc., and applying a paste with an appropriately adjusted consistency to a mold. It is manufactured by injecting it and heating and curing it in a heating furnace.

[0003] The finished sink or the like is taken out of the mold, but a release agent such as silicone, fluororesin, PVA, or wax is applied in advance so that the product can be smoothly separated from the mold.

0004

[Problem of the Invention] However, since the artificial marble material is a mixture of organic and inorganic substances, it tends to adhere to the surface of the mold very easily during the curing process after casting. The mold release agent described above does not provide sufficient mold release properties.

[0005] Therefore, shrinkage is not uniform during curing,
Cracks and voids (so-called sink marks) occur, resulting in defective products.

[0006] In addition, when conventional mold release agents are used a certain number of times, artificial marble material adheres to the surface of the mold, and the mold release agent solidifies or accumulates, so it is necessary to clean the surface of the mold. there were.

Furthermore, since the mold release agent adheres to the product,
It was necessary to remove it and perform finishing work.

[0008] Therefore, an object of the present invention is to provide a method for manufacturing an artificial marble sink, etc., which does not cause cracks or voids in the product and can minimize the work of removing mold release agent from the product and cleaning the mold. It is to be.

[0009]

[Means for solving the problems] In order to solve the above problems, in the present invention, a film with good mold release properties is closely attached to the mold surfaces of the male and female molds, and a raw material paste of artificial marble is injected and cured by heating. The company began manufacturing artificial marble sinks and other products.

0010

[Function] Since the mold surface and the release film are not fixed, when the artificial marble material hardens and shrinks, both the film and the mold surface and the film and the artificial marble material slip, which does not interfere with uniform shrinkage. There are no cracks or voids in the product.

[0011] Furthermore, the film can be easily removed from the mold, does not require cleaning the mold, and does not adhere to products.
It can be used as is as a product packaging material if necessary.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, first, a bowl-shaped male mold 1 is prepared.
The outer surface of the sheet is completely covered with a film F having good mold releasability.

The film F may be appropriately selected depending on the material of the artificial marble material, and for example, polyvinyl alcohol, cellophane, polypropylene, chloroprene rubber, etc. are suitable.

Since a mounting pin 3 for a mold assembly bar 4 (see FIG. 2) is set up on the opening peripheral surface 2 of the male mold 1, this pin 3 can be attached by making a hole in the film F, etc. Leave it exposed.

Then, as shown in FIG. 2, the film F is brought into close contact with the outer surface of the male mold 1. At this time, suction may be performed from the hole 5 using a vacuum pump, if necessary.

With the film F in close contact with the outer surface, while inserting the pin 3 into the molding bar 4, apply the bar 4 to the opening circumferential surface 2, tighten it with the wing nut 6, and tighten the circumferential edge of the film F. It is held between the opening peripheral surface 2 and maintained in a close contact state.

Next, as shown in FIG. 3, the opening 11 and flange 12 of the bowl-shaped female mold 10 placed on the underframe 20 are
is covered with the same film F as described above, and the inner surface of the female mold 10 is suctioned through the suction hole 13 by the vacuum pump P.

When the film F is brought into close contact with the inner surface of the female mold 10, the locking hole 14 provided in the flange 12 will open as shown in FIG.
The bolt 15 is inserted into the bar 4, and the bar 4 and the flange 12 are connected by a wing nut 16, and at the same time, the peripheral edge of the film F that is in close contact with the inner surface of the female mold 10 is clamped.

In this way, a mold is completed in which a certain molding space S is formed by the male mold 1 and the female mold 10, and the inner surface of the molding space S is completely covered with the film F.

Then, as shown in FIG. 5, paste-like artificial marble raw material A was injected into the completed mold, and
After heating and curing at a temperature of 100°C for 2 to 5 hours, the formwork is dismantled and the product is taken out.

[0022]

[Effect] According to the present invention, as described above, since molding is performed by closely adhering a film with good mold release properties to the mold surfaces of the male mold and female mold, unlike applying a mold release agent, the mold The ability to release the mold from the surface is dramatically improved, and since the film and mold surface are not bonded, it acts as a cushion when the artificial marble raw material hardens and shrinks, preventing cracks and voids from forming in the product. , extremely effective in improving quality and yield.

[0023] Furthermore, since there is no mold release agent adhering to the product, finishing work can be reduced, and there is no need to periodically clean the mold release agent adhering to the mold, resulting in cost reduction. Contribute to

[0024] In addition, if a film with good mold releasability is taken out along with the product as it is, there are many advantages such as being able to use it for packaging.

[Brief explanation of drawings]

[Figure 1] Cross-sectional view showing the state in which the film is stretched over the male mold

[
Figure 2: Cross-sectional view showing the above film in close contact with the male mold

[Figure 3] Cross-sectional view showing the state in which the film is stretched over the female mold

[
Figure 4: Cross-sectional view showing the assembled formwork with male and female molds

[
Figure 5: Perspective view showing the completed formwork in use

[Explanation of symbols]

1 Male type 2 Opening circumferential surface 3 Pin 4 Mold assembly bar 5 holes 6 Wing nut 10 Female type 11 Opening 12 Flange 13 Suction hole 14 Locking hole 15 bolts 16 Wing nut 20 Underframe A. Artificial marble raw material F Film M motor P Vacuum pump S Molding space

Claims (1)

[Claims] 1. A method for producing an artificial marble sink, etc., which comprises adhering a film with good release properties to the mold surfaces of a male mold and a female mold, injecting a raw material paste of artificial marble, and heating and curing the paste.