JPS6129511A - Manufacture of product made of room temperature curing resin - Google Patents

Abstract

PURPOSE:To produce a desired molded product, using one model by pouring room temperature curing resin into a cavity from which granular material has been drawn out after its hardening. CONSTITUTION:The pressure in the space composed of a frame member 7, a molding film 14 and a covering film 15 and containing granular material 16, is reduced under vacuum, and the granular material is solidified, whereby the bottom force D for molding is obtained. A cavity is formed, connecting the top force U formed similarly to a bottom force D. After a covering film 35 and a molding film 34 have been cut by melting, a bung hole 21 and a connecting hole 22 extending to the cavity are provided, and then the liquid of room temperature curing resin is poured from the bung hole 21 thereinto. After its curing, the covering films 15, 35 are removed, and the granular material is exhausted from the frame members 7, 27. Then, when the frame member 7 is separated from the frame member 27 and is raised, the room temperature curing resin is cured, and the molded product with a molding film on its surface may be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing cold-curing resin products. The applicant first filled a space defined by a frame, a molding film, and a shielding film with particulate matter, and created a mold by vacuuming the space and solidifying the particulate matter. The company has developed and applied for a method for manufacturing resin products using this mold. By the way, in the above manufacturing method, there are two molds for the upper mold and the lower mold.
It is uneconomical because different types of master molds are required. Therefore, the molds for the upper mold and the lower mold are placed on a surface plate equipped with a suction means to form the mold, and the suction is fixed. We are also trying to share the same plate, but this manufacturing method requires two or more models, and the models must be placed in precise positions on the surface plate so that the upper and lower molds can be accurately matched. There are problems such as having to set the mold and also needing pins for mold matching on the frame.

The present invention has been made in view of the above circumstances, and includes molding upper and lower molds for molding a desired resin product using one type of model,
The object of the present invention is to provide a method for producing cold-curable resin products using the upper and lower molds.

Embodiments of the present invention will be described in detail below with reference to the drawings. (1) is a rectangular plate-like surface plate, and inside the surface plate (1) is a hollow chamber (not shown) connected to a vacuum pump (not shown).
2) is formed, and the upper surface of the surface plate (1) is communicated with the hollow chamber (2) via a plurality of pendholes (3). (4) is a model that has almost the same external shape as the product to be manufactured, and the model (4) does not need to be divided when molding, and is suitable for use with natural products, arts and crafts, etc. The actual item can be used as a model (4). In addition, if the model (4) does not have air permeability, a through hole (5) is provided therethrough.

(6) is a fixing member that fixes the model (4) on the surface plate (1), and is a particulate material such as metal, glass, sand, plastic, etc. that contains a binder and has a size of about 50μ to 1.5μ. It is composed of substances. Examples of the binder include furan-based resins to which a curing catalyst is added and which harden when left to stand, urethane-based resins which harden when amine gas flows, and sodium silicate which hardens when carbon dioxide gas flows. Further, the fixing member (6) may be made of a plastically deformable material such as oil clay and may be provided with ventilation holes as appropriate.

(7) is a frame body, and a hollow chamber (8) connected to a vacuum pump (not shown) is formed in the side wall of the frame body (7). The inner space of the frame (7) is made such that only air can pass therethrough by a wire mesh (9) attached to the inner surface of the frame (7), and a large number of transparent holes are provided on the inner surface of the frame (7). Intake hole (1
0) (10) and the wire mesh (11) wrapped around the body surface
(11) allows only air to pass through the small hole (12
) are transparently installed in the body, and both ends are the frame (7)
A plurality of intake pipes (13) (13) are connected to and fixed to the side wall of the hollow chamber (8) (see Fig. 2).

(14) is a flexible but non-permeable molded film made of polyethylene, polypropylene, polystyrene, vinyl chloride, vinylidene chloride, ABS resin, polyamide, acrylic resin, polycarbonate, ionomer, ethylene, vinyl acetate copolymer, There are those made from synthetic resins such as polyvinyl alcohol, and those made from rubbers such as ethylene/vinyl acetate copolymer, styrene/dutadiene copolymer, butyl rubber, and natural rubber.

Then, after using these materials as a molding film (14) containing or painting coloring agents such as pigments, dyes, and metals (such as pigments, dyes, metals, etc.) or coating them with ultraviolet absorbers as a molding film (14), they are directly attached to the molded product. Molded products can be colored by

Alternatively, a textured pattern such as a grain pattern or a thread pattern can be applied to the surface of the molded product by using it as the molding film (14) and then directly adhering it to the molded product. In the case of
14] can be cut and removed, but the molded product and the molded film (14
), it is necessary to perform a treatment such as applying an adhesive to the molded film (14) in advance.

(15) is a non-air permeable shielding membrane, which may be made of plastic, rubber, metal, or paper. (16) is particulate matter, which 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 (16) is that it has good filling properties.Furthermore, when room-temperature curing resin generates heat during curing or requires heating to a certain extent during molding, it can be heated at these temperatures. The particle size of the particulate material may be about 10 μm to 3 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 it will be difficult to handle the particulate matter and will generate dust, which will worsen the environment.On the other hand, coarse particles will have the opposite effect. This phenomenon occurs, and the particle size is generally about 50 to 600 μm. (17) and (18) are a truncated conical injection port model and a communicating hole model.

Next, a method for manufacturing a room temperature curable resin product will be explained.

Place the fixing member (6) on the top surface of the surface plate (1), push the model (4) into the fixing member (6), and place the model (4) through the fixing member (6) onto the surface plate (1). In this case, the model (4) is fixed in an upright position so that it can be pulled out from the lower mold (D) and fixing member (6), which will be described later, and the maximum external fit of the model (4) is The fixing member (6) is pushed into the fixing member (6) to the dimensional position, and the fixing member (6) is formed into a truncated cone shape so that it can be pulled out from the lower mold (D) described later.Then, the fixing member (6) is cured by appropriate means, and then a vacuum pump (not shown) is activated to suck and depressurize the inside of the hollow chamber (2), whereby the surface plate (
1) A suction action is caused on the surfaces of the model (4) and the fixing member (6). Note that the hardened fixing member (6) has air permeability. Next, the molded film (14) made of thermoplastic synthetic resin softened by heating is placed on the model (4) and the fixing member (
6) and the surface plate (1), the formed film (1)
4) are adsorbed to their surfaces while being suction-stretched.

Next, the frame (7) is placed on the upper surface of the surface plate (1) to which the formed film (14) has been adsorbed, and the surface plate is placed in the space constituted by the frame (7) and the formed film (14). Particulate matter (16) is injected and filled while vibrating (1) and frame (7), and then a shielding film (15) is placed on frame (7) and particulate matter (16).
to cover the upper end opening of the frame (7). Then,
A vacuum pump (not shown) is driven to move the inside of the space formed by the frame (7), the molded film (14), and the shielding film (15) and containing the particulate matter (16) through the intake hole (10).
10) and the suction pipe (13) When the pressure is reduced by suction through (13), the particulate matter (16) is solidified by the action of atmospheric pressure. Next, the suction action is stopped by stopping the drive of the vacuum pump (not shown), the adsorption state of the formed film (14) is released, and then the particulate matter (16) is solidified and held by the frame (7). The model (4) is separated from the fixing member (6) and the surface plate (1), raised, and reversed.

As a result, a lower mold (D) for molding the room temperature curable resin into a molded product can be obtained. Next, the formed film (14)
0.05 to 2.001 with a needle, drill, wire, etc. to the required location.
After drilling a small hole (19) with a size of about 111, set the model (4) on the lower mold (D) again, and then
The injection port model (17) and the communicating hole model (1
8) respectively (see Figure 3), and then a molded film (34) having exactly the same properties as the molded film (14) is heated and adsorbed on the surface of the molded film (14). let

Hereinafter, the upper mold (U) is molded in the same manner as the lower mold (D) (
(See Figure 4). In addition, in Fig. 4, (27), (3
3), (35), and (36) are the above-mentioned frame body (7), intake pipe (13), shielding film (15), and particulate matter (16).
The frame body, intake pipe, shielding membrane, and particulate matter have exactly the same structure and properties. Next, the upper mold (U) is replaced with the lower mold (D).
The model (4) and the injection port model (1
7) and the communicating hole model (18) are extracted from the lower mold (D), and then the fitting portions (20) (40) of the upper and lower molds (U) (D) formed by a portion of the fixing member (6) are removed. The upper and lower molds (U) and (D) are fitted together to form a cavity as shown in FIG. Next, predetermined portions of the shielding film (35) and the forming film (34) are cut by appropriate means to form an injection port (
21) and the communicating hole (22) (see FIG. 5),
Subsequently, a liquid cold-setting resin is injected from the injection port (21).

Then, the air in the cavity is discharged from the communication hole (22) and the cavity is filled with resin.

Note that room temperature curable resins include polyurethane, polyester, acrylic, epoxy, polyamide, furan, etc. Instead of these resins, synthetic rubbers such as polyurethane, silicone, polysulfide, etc. may be used. Moreover, a foaming product can be made by adding a foaming agent to these products.

Furthermore, fillers such as calcium carbonate, talc, clay, and silica alumina, and reinforcing materials such as glass fibers, carbon fibers, ceramic whiskers, and metal whiskers may be mixed therewith. Furthermore, the reinforcing material is made by forming the fiber material into a cross shape or a mat shape, or bundling it and cutting it into short lengths, and then forming it into a general product shape and setting it in the lower mold (D),
Alternatively, a room temperature curable resin may be injected. After maintaining this state for a required period of time to cure the resin, the drive of the vacuum pump (not shown) is stopped to stop the suction action on the frames (7) (27), and the shielding films (15) (35') are removed. At the same time as removing particulate matter (16) from inside the frames (7) and (27),
), (36), and then the frame (7) is ejected from the frame (2).
When separated and raised from 7), the room-temperature curable resin is cured and a molded product with molded films (14) and (34) attached to its surface can be taken out. By cutting and removing unnecessary portions such as the excess molding films (14) and (34) and the injection port portion from this molded product, a room-temperature curable resin product with a colored or uneven pattern on the surface can be obtained.

In addition, if a color or uneven pattern is not required on the surface of the product, use an untreated molded film, peel the molded film from the molded product, and remove the molded film (14
), (34) are coated with a mold release agent in advance.

Note that the injection port and the communication hole may be formed as shown in FIGS. 6 and 7. That is, as shown in FIG. 6, a communication member (23) extending to the outer surface of the frame (7) is attached to the model (4), and a sleeve (24) is placed on the upper end surface of the model (4). Later sleeve (24),
The molded film (34) is adsorbed onto the surfaces of the communication member (23), the model (4), and the molded film (14), and then the molded film (
The cylindrical tube (25) is inserted into the adsorbed sleeve (24), and then the upper die (U) is formed in the same manner as described above, and the forming film (34) at the lower end of the cylindrical tube (25) is
Alternatively, the inlet (21a) and the communication hole (22a) may be formed by removing the inlet (21a) and the communication hole (22a) as shown in FIG.

In addition, the small holes (19) of the molding film (14) of the lower mold (D) are
With the model (4) set in the lower mold (D), a wire may be passed through the through hole (5) to open the hole. Furthermore, one of the intake hole (10) and the intake pipe (13) may be omitted. In addition, the fixing member (6) should be air-permeable if the area of the part protruding from the fixing member (6) of the model (4) is small and the molded film (14) can be brought into close contact with the model (4). It doesn't have to be.

Alternatively, a small hole (19) may be provided in the highest membrane of the cavity so that the air in the cavity is discharged through the small hole (19), thereby omitting the communication hole (22) (22a).

As is clear from the above description, according to the present invention, not only can upper and lower molds be molded using one model and a surface plate, but also the actual mold can be used as a model. It has excellent effects such as being able to accurately match the

[Brief explanation of drawings]

1 to 5 are longitudinal cross-sectional views of process illustrations of one embodiment of the present invention, and FIGS. 6 and 7 are longitudinal cross-sectional views of main process illustrations of other embodiments. (1): Surface plate (4): Model (6): Fixed member (7); (27): Frame (14);
(34): Formed film (15); (35): Shielding film (16); (36): Particulate matter ridge 1 Figure 1' Figure 3 Prisoner #-5 Figure 1i+7

Claims (1)

[Claims] A model is fixed to the upper surface of a surface plate provided with a suction mechanism via a fixing member, and the first formed film is adsorbed to the surface of the model, the fixing member, and the surface plate, and then a suction mechanism is provided on the surface plate. A first frame body is placed with a first molded film interposed therebetween, and a space defined by the first molded film and the first frame body is filled with a first particulate material, and then the first frame body is covering the upper surface of the body and the first particulate matter with a first shielding film to shield the upper end opening of the first frame;
solidifying the first particulate matter by sucking and depressurizing the space configured by the first frame, the first molded film, and the first shielding film and containing the first particulate matter through the suction mechanism;
After the first forming film is released from adsorption to the model, fixing member, and surface plate, the first frame is attached to the fixing member and the surface plate while the model is held on the first forming film or the model is separated. A first mold is formed by separating from the mold, and after inverting the first mold, a plurality of small holes are formed in the first molded film, and a second molded film is adsorbed on the surface of the model and the first molded film. After that, a second frame body equipped with an air intake mechanism is placed on the first mold with a second molded film interposed therebetween, and a second frame body is placed in a space defined by the second molded film and the second frame body. After filling the second particulate matter, a second shielding film is placed on the upper surface of the second frame and on the second particulate matter to shield the upper end opening of the second frame, and the second frame and the second particulate matter are filled with The space formed by the forming film and the second shielding film and containing the second particulate matter is sucked and depressurized through the suction mechanism to solidify the second particulate matter, and the second frame body is removed from the first mold. After separating and molding a second mold, and extracting the model from the first mold or the second mold, the first and second molds are brought together to define a cavity with an injection port, and a cavity is formed from the injection port. A method for producing a room-temperature-curing resin product, which comprises injecting a room-temperature-curing resin into a molded product.