JPS60179210A - Manufacture of mold for producing cold setting resin product - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the defects owing to gas, blocking the air entering in cold setting resin by providing vent holes at the positions corresponding to the uppermost end or the tip end of the product cavity which is defined by registering the mold parts after said each mold part attached to a frame member has been separately formed. CONSTITUTION:Vent hole 12 is bored at the portions corresponding to the uppermost end or the tip end of the cavity for product by a needle or a gimlet. After a fiber like reinforcing member 11 has been set on the mold face of a bottom force D, while fitting it to the shape of said mold face, a top force U is placed with mold register thereon, thereby defining the product cavity which has a pouring port 13 and includes the fiber like reinforcing member 11. When liquid cold setting resin 10 is poured from the pouring port 13, because the air in the product cavity is forcedly removed by suction from the vent hole 12, the product cavity is filled with said cold setting resin 10 without bringing air. The objective cold setting resin product without the cracks and defects such as pinholes may be obtained by removing unnecessary parts such as excessive molding film 5, 25 and the part of the pouring port.

Description

[Detailed description of the invention] The present invention relates to a mold for producing cold-curing resin products.

Conventionally, when manufacturing cold-curing resin products using molds such as metal molds and resin molds, air penetrates into the resin and gas defects such as pinholes occur in the product. This was noticeable when manufacturing products containing wood. Therefore,
Although slits and small holes for air venting are provided in the mold, there is a problem in that the manufacturing cost of the mold increases.

The present invention was made to solve the above problems.
Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

(1) is a wooden or plaster-shaped master mold, and the upper surface has a convex portion (2) that has almost the same shape as a part of the external shape of the room-temperature curing resin product, and the lower portion has a ventilation pipe (3).
A hollow chamber (4) is formed, which is connected in communication to a vacuum pump (not shown) via 1. Moreover, a truncated conical injection port model (1a) is erected on the upper surface of the master mold (1). (5) is a flexible but non-permeable molded film that can be used to synthesize polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride polyamide, polycarbonate, ionomer, polyvinyl alcohol, ethylene-vinyl acetate copolymer, etc. There are those made of resin and those made of synthetic resin such as ethylene-vinyl acetate copolymer and styrene-butadiene copolymer. (6) is a frame body, and an intake pipe (7) (7) with ventilation is installed in the space of the frame body (6), and the intake pipe (7) is attached to the frame body (6). It is connected to a vacuum pump (not shown) through a hollow chamber (not shown) provided in the .

(8) is a non-breathable shielding membrane, which may be made of plastic, rubber, metal, or paper. (9) Particulate matter includes inorganic particles such as metal powder, glass powder, sand, and other inorganic compound powders, and organic particles such as wood powder and plastic powder. The necessary property of this particulate material (9) is that it has good filling properties.Furthermore, when the room-temperature curing resin generates heat during curing or needs to be heated to a certain degree during molding, it can be heated at these temperatures. It must have sufficient heat resistance. Further, the particle size of the particulate matter (9) may be about 10 μm, but care must be taken because the smoothness of the surface of the molded product is affected by the particle size. If the particle size is small, the smoothness of the surface of the molded product and the transferability of fine uneven patterns will be improved, but the particulate matter (9) will be difficult to handle and will generate dust, which will worsen the environment. On the other hand, if the particles are coarse, the opposite phenomenon will occur, and the particle size is generally about 50 to 600 μm. (10) is a resin that hardens at room temperature, and includes polyurethane, unsaturated polyester, acrylic, epoxy, polyamide, etc. Synthetic rubber such as silicone may be used instead of these resins.

(11) is a fibrous reinforcing material in the general shape of a product, which is made by molding a fibrous material such as glass fiber or carbon fiber in the form of a sheet or strand chip into the general shape of the product.

Next, a method for manufacturing a room temperature curable resin product will be described. Activate the vacuum pump (not shown) and master mold (1)
The pressure inside the hollow chamber (4) is reduced by suction to apply suction to the upper surface of the master mold (1) including the surface of the convex portion (2), and then a molded film (5) made of thermoplastic synthetic resin is softened by heating. When the molded film (5) is placed on the upper surface of the master mold (1), the molded film (5) is suctioned and stretched and adsorbed to the two surfaces of the master mold (1) and the surface of the injection port model (1a). Next, a formed film (5
Place the frame (6) on top of the master mold (1) that has been adsorbed, and place the master mold (1) and the frame ( Particulate matter (9) is introduced and filled while vibrating the frame (6) and the particulate matter (9), and then the shielding film (8) is covered on the upper surfaces of the frame (6) and the particulate matter (9), and the frame (6) is replaced with the shielding film (8). Cover the top opening of the Next, a vacuum pump (not shown) is driven to move the intake pipe (7) ( 7), the particulate matter (9) is solidified by the action of atmospheric pressure. Next, by stopping the drive of the vacuum pump (not shown), the suction action to the upper surface of the master mold (1) is stopped, the adsorption state of the formed film (5) to the upper surface of the master mold (1) is released, and then the particulate matter is removed. The frame (6) that solidifies and holds (9) is separated and lifted from the master mold (1) to form a second mold (U) for producing a room-temperature curable product. Next, the molded film (5) and the shielding film (8) at the upper end of the injection port formed by the injection port model (1a) are removed by fusing, and the melted parts are joined to each other. ) where it is necessary to vent air from the mold part,
That is, a product cavity is defined and a room-temperature curable resin (
When the resin (10) is injected, the product cavity is filled with the resin (10), for example, at the top or tip of the product cavity.
2) Seed (12). In addition, ventilation holes (12) (1
The appropriate size of 2) is 0.05 to 2.0 mm. If it is too small, the ventilation holes (12) (12) will easily become clogged, and if it is too large, the individual fat (10) will enter the particulate matter (9) and leave marks on the product. 0.1～
A range of 1.Q mm is optimal. Next, a separately molded lower mold (D) (in the example, similar to the upper mold (U), a molding film (25), a frame (26), a suction tube (27), a shielding film (
28) and particulate matter (29). ) After setting the fibrous reinforcing material (11) on the mold surface according to its shape, place the upper mold (U) on the lower mold (D) with the molds aligned, and open the injection port (13). and defines a product cavity containing a fibrous reinforcement (11). When the liquid room-temperature curable resin (10) is injected into the product cavity defined in this way from the injection port (13) under atmospheric pressure or under pressure, the air inside the product cavity flows through the ventilation hole (12).
(12), the cold-curing resin (10) fills the product cavity without air entering therein. After the room temperature curing resin (10) is cured by reaction, the vacuum pump (not shown) is stopped to stop the suction action on the frames (6) and (26), and then the shielding film 1 is removed.
'8) (28) is removed and the frame body (6) (2
Particulate matter (9) (29) is discharged from 6), and then the frame body (6) is separated from the frame body (26) and raised.
A molded article can be taken out from which the cold-curing resin (11) containing the fibrous reinforcing material (11) has hardened and the molded films (5) (25) have adhered to its surface. By removing unnecessary portions such as the excess molding film (5) (25) and the injection port portion from this molded product, a desired room-temperature curable resin product free from gas defects such as pinholes can be obtained.

If a color or uneven pattern is required on the surface of the molded product, use a colored film or one with an uneven pattern as the molding film (5) (25). of,
Remove the excess and leave it attached to the molded part. Further, the fibrous reinforcing material (11) may be cut and mixed into the cold-setting resin (10) in advance, or may be omitted if the product does not require much strength.

Furthermore, the frame body (6) (26) has an intake pipe (7) (
Instead of 27), a wall member that can be ventilated, such as by providing a small hole in which a permeable material such as a wire mesh is stretched in the wall member of the hollow chamber (not shown) formed in the frame (6) (26). A hollow chamber may be provided. In addition, the room temperature curable resin (10) is injected into the product cavity by inserting the container (40) containing the room temperature curable resin (10) through the introduction pipe (41), as shown in Fig. 3. The product cavity is connected to the inside of the product cavity and the pressure is slightly reduced by suctioning air from the ventilation hole (12) (12).
It may also be possible to make it inhale. Furthermore, as shown in FIG. 4 and factor 5, after charging a predetermined amount of room temperature curable resin (10) into the recess of the lower mold (D),
) may be molded by any number of people to fit the convex part into the concave part. In this case, the ventilation holes (12) (12) need to be provided at the proximal end of the convex portion of the molding film (5) of the upper mold (U). As a result, when the upper mold (U) is fitted to the lower mold (D), the air generated at the upper end of the product cavity is removed through the ventilation holes (12).
(12), so the room-temperature curing resin (1
0) No intrusion into the interior.

As is clear from the above explanation, according to the mold of the present invention, a product cavity is defined, and the air inside the product cavity is suctioned and removed from the mold, so that air is trapped in the room-temperature curing resin. It has two excellent effects, such as preventing gas from entering the product, causing gas defects in the product, and allowing the mold to be formed using an inexpensive wooden mold.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the second explanatory diagram for molding the mold of the present invention, Fig. 2 is a longitudinal cross-sectional view of a product cavity defined by the mold of the present invention, and Fig. 3 is The vertical sectional view, FIGS. 4 and 5, which are illustrative diagrams of the first method for injecting a room-temperature curable resin into the product cavity defined by the mold of the present invention, are the mold of the present invention. FIG. 6 is a longitudinal cross-sectional view illustrating a second method for injecting a cold-curing resin into a defined product cavity; (1): Master mold (2): Mold part (5); (25): Molding film (6); (26
): Frame (7); (27): Intake pipe (8);
(28): Shielding membrane (9); (29): Particulate matter (12): Vent hole 1 figure, enemy 2 figure

Claims (1)

[Claims] After a molded film is adsorbed onto the surface of a master mold having a mold section on its surface, a frame body equipped with an air suction means is brought into contact with the surface of the master mold to define a space, and particulate matter is injected into the space. After filling the frame and the particulate matter, a shielding film is placed over the frame and the particulate matter to shield the upper end opening of the frame, thereby creating a space constituted by the frame, the molded film, and the shielding film and containing the particulate matter. The particulate matter is solidified by suctioning and depressurizing the inside through the suction means, and after releasing the adsorption state of the molded film to the surface of the master mold, the frame is separated from the master mold, and the separated frame is In the molding film for the body, a ventilation hole is provided at the uppermost or leading edge of the product cavity that is defined when the mold part for the frame is fitted into a separately molded mold. A method for forming molds for manufacturing resin products that cure at room temperature.