JPH10193370A - Method and device for manufacturing resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a molded product by putting a granular or a powdery metal aggregate and a thermoplastic resin into a frame. SOLUTION: Meters 5 and 6 for metering a granular or a powdery metal aggregate A and a thermoplastic resin B separately are provided, and a metered granular or a metered powdery metal aggregate and a molten thermoplastic resin are put alternately or simultaneously into a frame 7, and the metal aggregate having been put in is heated by a heating means 10, and a molded product is manufactured by utilizing the heat developed by the metal and pressurizing the thermoplastic resin by a pressurizing means 11 while softening or melting the thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a resin molded product obtained by bonding a granular or powdery metal aggregate with a thermoplastic resin.

[0002]

2. Description of the Related Art In a conventional resin molded product, a thermoplastic resin as a material is melted while being heated by a heating means, and the molten thermoplastic resin is mixed with an aggregate such as gravel heated by another heating means. After mixing by a mixing means, this mixture was molded to obtain a resin molded product.

[0003]

According to the manufacturing method as described above, the molten thermoplastic resin and the heated aggregate are kneaded, and the kneaded mixture is filled in a mold and molded. In addition, a decrease in heat is caused in the inside, and when a plurality of thermoplastic resins are melted at the same time, an unpleasant odor often occurs.

For this reason, it is necessary to carefully control the temperature immediately before filling the mold, and the cost of equipment is significantly increased by means of supplementing and managing heat, or the temperature inside the mold is reduced due to the decrease in temperature. There was also a problem that the molten resin material did not spread to every corner and the finished product had a poor surface finish, and that it was necessary to take measures against odors.

In addition, since the molten resin material and the heated aggregate are kneaded by the mixing means, the molten resin material and the aggregate cannot be alternately filled in a mold in a sandwich shape. There is also an inconvenience that the surface layer side of the molten resin material cannot be colored differently from the next layer side.

Accordingly, an object of the present invention is to facilitate temperature control, to spread the molten resin material all over the inside of the mold, to improve the surface finish of the product, and to form the molten resin into the mold with the granular material. Alternatively, powdered metal aggregates are alternately supplied, or coloring of a predetermined layer of molten resin is facilitated, and furthermore, generation of offensive odor can be minimized.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention measures a granular or powdery metal aggregate and a thermoplastic resin separately at room temperature and then alternately or alternately weighs them in a mold. At the same time, after that, while heating the metal aggregate by irradiating the metal aggregate in the mold with a metal heating means such as microwave or electromagnetic wave, the heat generated by the metal aggregate is used for the mold. After softening or dissolving the thermoplastic resin inside, a pressure molding method is adopted.

Further, the first thermoplastic resin to be charged into the mold is colored by an appropriate means, or a colored polyethylene resin is used as the first thermoplastic resin to be charged into the mold. Sometimes.

Further, a measuring means for separately measuring the granular or powdery metal aggregate and the thermoplastic resin at room temperature, and a formwork which receives the measured metal aggregate and the thermoplastic resin alternately or simultaneously. A resin comprising: a metal heating means such as a microwave or an electromagnetic wave for heating the metal aggregate in the mold; and a pressure molding means for molding the softened or melted thermoplastic resin in the mold. Adopt molding equipment manufacturing equipment.

In some cases, the first layer thermoplastic resin to be charged into the mold is colored by a coloring means, or a polyethylene resin is used as the first layer.

[0011]

Embodiments of the present invention will be described with reference to the accompanying drawings.

In the first embodiment of the present invention, as shown in FIG. 1, a granular or powdery metal aggregate A is placed in a first hopper 1 and a thermoplastic resin B is placed in a second hopper 2. Each has been entered.

The metal aggregate A in the first hopper 1 and the thermoplastic resin B in the second hopper 2 are respectively weighed by opening the opening / closing device 3 from the chute 4 having the opening / closing device 3 such as a shutter. When it is supplied to 5, 6 and the weighing by the measuring devices 5 and 6 reaches a predetermined amount, the opening and closing device 3 is closed to stop the supply.

The weighed metal aggregate A and the thermoplastic resin B are put into a mold 7 which is kept immediately below the measuring devices 5 and 6.

The above-mentioned formwork 7 is supported on a conveyor 8 as shown in FIG. 1, and the metal aggregate A and the thermoplastic resin B are alternately supplied by the reversible operation of the conveyor 8 to form a sandwich. Alternatively, as shown in FIG. 2, the metal aggregate A and the thermoplastic resin from both measuring devices 5 and 6 may be simultaneously supplied from one chute 9 to the formwork 7.

After the metal aggregate A and the thermoplastic resin B supplied to the mold 7 as described above are stopped, the metal frame A in the mold 7 is stopped by the metal heating means 10 such as microwaves or electromagnetic waves after the mold 7 stops moving. The material A is changed to 200 according to the characteristics of the thermoplastic resin.
The thermoplastic resin B in the mold 7 is softened or melted by utilizing the heat generated by the metal aggregate A by generating heat at a temperature of 400C to 400C.

Thereafter, the mold 7 which has moved forward and stopped
Is formed by the pressure forming means 11 provided immediately above.

As shown in FIG. 1, the pressure forming means 11 comprises a cylinder 12 and a pressure plate 13 which is raised and lowered by the action of the cylinder 12 and is pushed into the mold 7 by lowering.

The resin molded product E manufactured as described above and taken out from the mold 7 is a resin molded product E having a metal aggregate A on its surface as shown in FIG. 3X or a metal aggregate A as shown in FIG. May be sandwiched.

In the second embodiment of the present invention, a pigment is supplied to the first layer of the thermoplastic resin B to be charged into the mold 7 to be colored.

In the above-mentioned coloring method, for example, as shown in FIG. 4, a set amount of pigment is supplied from a pipe 21 to the thermoplastic resin B supplied to the measuring device 6 and the stirring blade 2 in the measuring device 6 is supplied.
2 to stir. Then, formwork 7
It is not necessary to color the entirety of the thermoplastic resin B to be charged into the inside.

In the third embodiment of the present invention, a colored polyethylene resin B 'is used as required in place of the thermoplastic resin B to be charged into the mold frame 7. Then, it is possible to manufacture a partly or entirely molded product having a beautiful surface.

The supply of the polyethylene resin B 'is as follows:
As shown in FIG. 5, the third storage of the polyethylene resin B '
A hopper 31 is provided. Of course, the chute 4 with the opening / closing device 3 and the weighing device 32 are provided below the third hopper 31 as in the first embodiment.

The above-mentioned granular or powdery metal aggregate A
In some cases, a waste (industrial) treatment product such as powder or granulated fine powder or shot blast particles is used to dispose of the waste. The molded product E is not limited to a plate-like body such as a road surface tile shown in the drawings, but may be, for example, a road-shoulder material, a block, a wave-dissipating block, a clue block, a U-shaped groove or a cover plate, a braille block, a guide block, or the like. What is necessary is just to shape | mold.

[0025]

As described above, according to the method and the apparatus for manufacturing a resin molded product according to the present invention, the granular or powdery metal aggregate and the thermoplastic resin are separately measured and then placed in the form. After being charged, the metal aggregate in the mold is heated by metal heating means such as microwaves or electromagnetic waves to generate heat, and the generated heat is used to soften or melt the thermoplastic resin. There is no need to heat the thermoplastic resin in advance, temperature control is not required at all, and the injection into the mold should be prior to the simultaneous or one of the granular or powdery metal aggregate and the molten thermoplastic resin Therefore, a granular or powdery metal aggregate or a thermoplastic resin can be positioned on the surface (surface layer) according to the place of use of the molded product, or the mixture can be alternately charged to form a sandwich.

Further, since the first layer of the thermoplastic resin to be charged into the mold can be colored, only the surface layer side of the molded product can be colored.

[0027] For this reason, only a part of the coloring is performed, so that the pigment can be saved remarkably and the cost can be reduced.

Further, since a polyethylene-based resin is used as the first thermoplastic resin to be charged into the mold, the resin can be easily spread to all corners of the portion corresponding to the surface of the product in the mold, and the product is completed. At the same time, the finished state of the surface of the molded product is improved, and at the same time, the compoundability at the time of coloring is facilitated, and the colored surface is also finely finished.

The resin material of the second and subsequent layers may be a single material or a plurality of materials (mixed types) depending on the surface usage conditions of the finished product. In other words, when the product can be considered to be used only as the surface of the final product, for example, as a roadbed material, the resin material of the second and subsequent layers may be a plurality of materials (mixed types).

In this case, only the first layer of the resin material is colored with a pigment or the like, and there is no need to color the entire resin, so that significant consumption of colored pigment can be saved.

Further, waste treatment such as shot blasting can be performed at the same time.

Further, since the raw materials merge with each other in the mold, the generation of offensive odor can be minimized.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a first embodiment of the present invention.

FIG. 2 is a partially cutaway enlarged front view showing simultaneous supply.

FIG. 3 is a partially cutaway perspective view of a molded product.

FIG. 4 is a front view of the second embodiment.

FIG. 5 is a partially cutaway front view of the third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first hopper 2 second hopper 3 opening and closing device 4, 9 chute 5, 6 weighing device 7 formwork 8 transport conveyor 10 heating means 11 pressure forming means 12 cylinder 13 pressure plate 21 pipe 22 stirring blade 31 third hopper 32 weighing Container A Metal aggregate B Thermoplastic resin B 'Polyethylene resin E Molded product

Claims (6)

[Claims] 1. A granular or powdery metal aggregate and a thermoplastic resin are separately weighed at room temperature, and then alternately or simultaneously charged into a mold, and then a metal heating means such as a microwave or an electromagnetic wave is provided. While irradiating the metal aggregate in the mold to heat the metal aggregate, the heat generation of the metal aggregate is used to soften or melt the thermoplastic resin in the mold, and then press-mold. A method for producing a resin molded product, comprising: 2. The method for producing a resin molded product according to claim 1, wherein the thermoplastic resin charged into the mold is colored by an appropriate means. 3. The method for producing a resin molded product according to claim 1, wherein a polyethylene-based resin colored as necessary is used as the first thermoplastic resin charged into the mold. 4. A measuring means for separately measuring a granular or powdery metal aggregate and a thermoplastic resin at room temperature, and a mold receiving alternately or simultaneously supplied the measured metal aggregate and the thermoplastic resin. A resin comprising: a metal heating means such as a microwave or an electromagnetic wave for generating heat from the metal aggregate in the mold; and a pressure molding means for molding the softened or melted thermoplastic resin in the mold. Equipment for manufacturing molded products. 5. The apparatus for producing a resin molded product according to claim 4, wherein the first-layer thermoplastic resin charged into the mold is colored by coloring means. 6. The apparatus for manufacturing a resin molded product according to claim 4, wherein said measuring means for said thermoplastic resin is provided in parallel with a measuring means for polyethylene resin for charging the first layer.