JPS60166418A - Manufacture of cold-setting resin product - Google Patents

Abstract

PURPOSE:To mold a molding die by using a die at low cost without employing a clamping device by abutting the molding dies against each other molded from a master die through an annular hollow chamber with a vent hole and demarcating a product cavity. CONSTITUTION:A molding film 10 made of a thermoplastic synthetic resin softened through heating is sucked to the upper surface of a master die 1 made of wood or gypsum. The inside of a shroud section 7 is filled with a granular substance 14, a shielding film 13 is applied, and the granular substance 14 is solidified through suction and decompression through a suction pipe mechanism 20, thus molding a top force U. A large number of vent holes 53 are bored to the surface of the molding film 10 surrounded by V-shaped projections 51, 52. When the top force U is mold-registered and placed to the upper surface of a separately molded bottom force W, the projections 51, 52 are brought into contact closely with the upper surface of the bottom force W, and an annular hollow chamber 54 is demarcated to the outer circumference of a product cavity. Force in magnitude obtained by multiplying the crosssectional area of the hollow chamber 54 by atmospheric pressure works to the top force U, and the top force U and the bottom force W are fast stuck strongly by a suction from the vent holes 53. A liquefied cold-setting resin 17 is injected into the product cavity, thus acquiring a desired product.

Description

[Detailed description of the invention] The present invention relates to a method for producing a room temperature curable resin product.

Conventionally, in the production of room-temperature-setting resin products, a product cavity is defined by aligning molds, resin molds, or split molds of a mold formed inside a frame, and liquid room-temperature-curing resin is poured into the product cavity. After the resin is injected and filled, and the resin is cured by reaction, the mold is opened, the molded product is taken out, the molded product is removed, and the molded product is colored and painted. However, this conventional manufacturing method requires the use of expensive metal molds, resin molds, or frames, which increases product production costs.Moreover, the liquid resin in the product cavity leaks from the mating surface of the mold. There were problems such as the need for a clamping device to clamp the mold with great force to prevent leakage.

The present invention was made to solve the above problems.
The purpose is to provide a method for manufacturing a cold-setting resin product that can be formed using an inexpensive wooden mold or plaster mold, and does not require a clamping device for the mold. below,
Embodiments of the present invention will be described in detail based on the drawings.

(1) is a master mold made of wood or plaster, and the upper surface has a mold part (2) that has almost the same shape as a part of the outer shape of the room-temperature curing resin product, and the lower part is connected to a vacuum pump (not shown). A connected hollow chamber (3) is provided.

On the outside of the mold part (2) on the upper surface of the master mold (1), there are two closed curved first and second V-shaped grooves (4) (5) extending along the contour of the mold part (2). ) are carved at appropriate intervals (see Figure 1). Also,
The second side of the master mold (1), including the surfaces of the mold part (2) and the first and second V-shaped grooves (4) (5), has suction holes (6).
(6) communicates with the hollow chamber (3) (see Figure 2). Furthermore, on the entire periphery of the top surface of the master mold (1),
A bracket (7) having an appropriate height is integrally formed, and an intake pipe mechanism (20), which will be described later, is mounted on the upper surface of the bracket (7).
) is set (18) - (18), (19)
(!9) is formed. (8) and (9) are cylindrical holders that hold a resin injection tube (15) and a communication tube (16), which will be described later.
) ←Samurai also has a resin injection pipe (15) and a communication pipe (1
6) each have an insertable inner diameter. (10)
is a flexible but non-breathable molded membrane made of synthetic resins such as polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, polyamide, polycarbonate, ionomer, polyvinyl alcohol, and ethylene-vinyl acetate copolymer. There are two types: one made of synthetic resin such as ethylene-vinyl acetate copolymer and styrene-butadiene copolymer. (13
) is a non-breathable shielding membrane made of plastic, rubber,
There are metal and paper ones. (14) is particulate matter,
There are 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 (14) is that it has good filling properties.Furthermore, when the room temperature curable resin generates heat during curing or needs to be heated to a certain extent during molding, it is necessary to have good filling properties. It must have sufficient copper heat resistance. Further, the particle size of the particulate matter (14) 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 (14) will be difficult to handle and will generate dust, which will worsen the environment. On the other hand, the opposite phenomenon occurs with coarse particles, which generally have a particle size of 50 to 600μ.
It is good to have something of a certain degree. (15) is a resin injection pipe for injecting liquid room temperature curing resin into the product cavity, and may be made of metal, plastic, glass, etc. (16) is a communication pipe that communicates the inside of the product cavity with the atmosphere, and is made of metal.
Some are made of plastic or glass.

(17) is a resin that hardens at room temperature, and includes polyurethane, unsaturated polyester, acrylic, epoxy, polyamide, etc. Synthetic rubbers such as silicone and polysulfide may be used instead of these resins. Reference numeral 20 denotes an intake pipe mechanism connected to a vacuum pump (not shown) via a flexible hose (not shown), and is configured as shown in FIG. 3. In other words, two long tubes (21) arranged at the same interval as the notch (19) of the master mold (1).
(21), both ends of the two short tubes (22) (22) are connected and fixed to the long tubes (21) (21) to form a lattice body, and the long tubes (21) (21) and short tube (22) (2
There are many small holes (23) (23) (24) in the body of 2).
) (24) is transparent and wire mesh (25)
(26) is wrapped so that only air can pass through the small holes (23) and (24), and the tips of the long tubes (21) and (21) are all airtightly closed except for the part communicating with the vacuum pump. Furthermore, a master mold (1
) has a structure in which handle members (27), (27) are fixedly spaced from each other and are directed outward at the same distance as the notch (18) (18).

Next, a method for manufacturing a room temperature curable resin product will be described. Set the holders (8) and (9) at predetermined positions on the mold part (2) of the master mold (1). In this case, the holder (
When setting it on an inclined surface as in 9), it is fixed with a weak adhesive so that it can be separated from the mold part (2) when demolding. Next, a vacuum pump (not shown) is operated to reduce the pressure in the hollow chamber (3) of the master mold (1) to apply suction to the upper surface of the master mold (1), including the surface of the mold part (2), and then heat it. When the molded film (10) made of thermoplastic synthetic resin softened by 9) is adsorbed to the surface. Next, the long pipe (21) of the intake pipe mechanism (20)
, insert the handle members (27) (27) into the notches (19) (19) (18) (18) of the master mold (1), respectively, and insert the intake pipe mechanism (20) into the hollow part of the master mold (1). (7), and then vibrate the master mold (1) inside the shell part (7) to remove the particulate matter (14).
Then, the bulk part (7) and the particulate matter (
14) Covering the upper surface with the shielding film (13) (7)
Cover the top opening of the In this case, the resin injection pipe (15
) and the communicating tube (16) through the shielding membrane (13), the shielding membrane (13) is brought into close contact with each outer surface of the resin injection tube (15) and the communicating tube (16). (See Figure 6). Next, a vacuum pump (not shown) is driven to form a forming film (10) and a shielding film (10) surrounding the particulate matter (14).
13) When the inside is suctioned and depressurized through the intake pipe mechanism (20),
The particulate matter (14) is solidified by the action of atmospheric pressure. Next, by stopping the drive of the vacuum pump (not shown), the suction action on the upper surface of the master mold (1) is stopped, and the adsorption state of the molded film (10) on the upper surface of the master mold (1) is released. The upper mold (U
) to form. Next, the molded film (10) located on the lower end surfaces of the resin injection pipe (15) and the communication pipe (16) is removed by appropriate means such as fusing to open their lower ends,
In addition, two closed curved first and second v-shaped protrusions (51) formed by the first and second v-shaped grooves (4) (5)
In the formed membrane (10) surrounded by (52), a large number of ventilation holes (53) (53) are bored with a needle, a drill, etc. In addition, the size of the ventilation holes (53) (53) is 0.2~
5.0 rin is enough, and a small gap and ventilation hole (53) (53)
It is necessary to increase the number of 0.
A range of 5 to 1.0 is optimal. Next, as shown in FIG. 8, this upper mold (U) is molded separately into a lower mold (W).
Align the mold and place it on the top surface. Note that the separately molded lower mold (W) has a mold 2 (U) injection pipe (15).
, communication pipe (16), and the like, but the other parts have the same structure as the upper mold (U). That is, the particulate matter (34) is solidified and held in a space surrounded by the molded film (30) and the shield Ill (33) and reduced in pressure by the intake mechanism (40). The molds were assembled in this way.
As shown in FIG.
2) is in close contact with the upper surface of the lower die (W) to define an annular hollow chamber (54) around the outer periphery of the product cavity.

By the way, inside this hollow chamber (54) there is a ventilation hole (53) (
53) and the pressure is reduced, a force equal to the force equal to the cross-sectional area of the hollow chamber (54) multiplied by the atmospheric pressure acts on the upper mold (U), and therefore the upper mold (U) The hollow chamber (54) is crushed by being pressed by the lower mold (W), and then the upper mold (U)
) and the lower die (W) are strongly brought into close contact by the suction action from the ventilation holes (53) (53). When the liquid room temperature curable resin (17) is injected into the product cavity defined in this way through the resin injection pipe (15) under atmospheric pressure or under pressure, the room temperature curable resin (17) is injected into the product. The product cavity is filled with air inside the cavity while being discharged from the communication pipe (16). After the room temperature curing resin (17) is cured by reaction, the vacuum pump (not shown) is stopped to stop the suction action on the intake pipe mechanism (20) (40), and the shielding film (13) (33) is removed. , particulate matter (9) (29) falls into the intake pipe mechanism (40)
On top, the molded product and the intake pipe mechanism (20) are left after the cold-curing resin (11) is cured and the molded films (10) (30) are attached to the surface of the resin (11). Excess molding films (10) (30) are peeled off from this molded product, and the holder (8) is removed.
(9) By removing unnecessary materials such as the resin injection pipe (15) and the communication pipe (16), a desired room temperature curable resin product 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 (10) (30).
), remove the excess portion and leave it attached to the molded product. In addition, a fibrous reinforcing material formed by forming fibers such as glass fiber or carbon fiber into a cross shape, a square shape, or a straight shape may be charged into the product cavity in advance, and the room temperature curing resin (17) may be injected into the product cavity, or the fiber It is also possible to cut the reinforcing material and mix it into the room-temperature curing resin (17) in advance. Furthermore, the first and second v-shaped protrusions (51
) (52) and ventilation holes (53) (53) (7) may be provided in either one of the lower molds (w). Furthermore, the protrusion (51) (
52) can be formed to have a semicircular or U-shaped cross section to obtain the same effect.

As is clear from the above description, according to the present invention, a mold can be accurately formed using an inexpensive wooden mold or plaster mold without using an expensive metal mold, resin mold, or frame. In addition, the molds can be brought into contact with each other with great force to prevent the resin inside the product cavity from leaking without using a special clamping device, and furthermore, it has excellent features such as making it easy to color and pattern the product. be effective.

[Brief explanation of drawings]

FIG. 1 is a plan view of a master mold used in carrying out the present invention;
Fig. 2 is a sectional view taken from A to A in Fig. 1, Fig. 3 is a plan view of the intake pipe mechanism used to implement the present invention, Fig. 4 is a longitudinal sectional view related to an explanatory diagram of the present invention, and Fig. 5 is an enlarged view of part B in Figure 4, and Figure 6
The figures are an enlarged view of section C in FIG. 4, FIG. 7 is an enlarged view of section D in FIG. (1): Master mold (2): Mold part (4); (5): V-shaped groove (7): Bracket part (10), (30): Molding film (13);
33): Shielding film (14); I'34): Particulate matter (20); (40): Intake pipe mechanism patent applicant Shinto Kogyo Co., Ltd. 5 ■ Bud 1 diagram

Claims (1)

[Claims] 1. A molding film is adsorbed onto the upper surface of a master mold, which is equipped with a hollow part surrounding the mold part and having a required height, and an intake pipe mechanism is installed inside the hollow part. Filling with particulate matter, covering the upper surface of the enclosed portion and the particulate matter with a shielding film to shield the upper end opening of the enclosed portion, and incorporating the particulate matter with the formed film and the shielding film. The particulate matter is solidified by suctioning and reducing the pressure in the space through the suction pipe mechanism, and after the adsorption state of the molded film on the surface of the master mold is released, the suction pipe mechanism is separated from the master mold and the resin is poured. A mold with an inlet is molded, and the mold is fitted to another separately formed mold to abut each other to define a product cavity, and the resin is injected into the product cavity through the resin injection port. A method for producing a room temperature curable resin product, which comprises injecting a liquid room temperature curable resin. 2. The molded film is adsorbed onto the upper surface of a master mold, which has a groove forming an area surrounding the mold part and a bracket part extending to surround the groove at an appropriate interval and having a required height on the upper surface. After setting the intake pipe mechanism inside the bracket,
Filling with particulate matter, covering the upper surface of the enclosed portion and the particulate matter with a shielding film to shield the upper end opening of the enclosed portion, and incorporating the particulate matter with the formed film and the shielding film. The particulate matter is solidified by suctioning and reducing the pressure in the space through the intake pipe mechanism, and after releasing the adsorption state of the molded film on the surface of the master mold, the intake pipe mechanism is separated from the master mold and the resin is removed. Molding a mold with an injection port, and matching the mold to another mold that is separately molded at a position corresponding to the area in the mold film or another mold that is molded separately. A method for manufacturing a room temperature curable resin product, comprising: forming a product cavity in contact with each other, and injecting a liquid room temperature curable resin into the product cavity through the resin injection port.