KR19980041738A - Resin molded article manufacturing method and apparatus - Google Patents

Abstract

A manufacturing method and an apparatus in which a resin molded product is obtained by injecting aggregate and a thermoplastic resin into a mold and pressing the resin in a softened or melted state.

The aggregate and the thermoplastic resin are weighed separately, and the aggregate and the thermoplastic resin are heated and introduced into the mold, but the aggregate is heated after the injection into the mold, and the resin is softened or melted by the heat, followed by press molding. And a resin molded article composed of a thermoplastic resin is obtained.

Description

Resin molded article manufacturing method and apparatus

TECHNICAL FIELD This invention relates to the manufacturing method of the resin molded article formed by combining aggregate with a thermoplastic resin, and its apparatus.

The conventional resin molded article is melted while heating the thermoplastic resin of the material by heating means, and after mixing the molten thermoplastic resin and aggregates such as gravel heated by separate heating means by mixing means, and then mixing the mixture. It shape | molded and the resin molded article was obtained.

In the conventional kneading method, it is not necessary to leave the aggregate and the thermoplastic resin in a mixed state unless the machine is continuously operated during the end of the kneading operation or during the resting time.

That is, the resin heated by the heating means softens with the drop of heat, and is fixedly attached to the periphery of the apparatus, so that new materials cannot be introduced unless the attachment is removed at the same time as the work resumes.

Therefore, as an example, there is a method of flowing the aggregate that serves as the internal cleaning at the end of the work, and the resin is attached to the interior of the aggregate, and then discharged together with the aggregate.

Naturally, a demand from the molten resin adhering to the aggregate arises around.

In this way, the aggregates as well as the resins attached to the aggregates cannot be reused, resulting in the generation of new debris, and also the cleaning work after the end of the work or the cleaning work by stopping the work. At the time of start, it becomes a heating operation from starting.

As another method, at the end of the work, there is a means for releasing the inside of the apparatus and cleaning the interior.

This is a method in which the resin fixedly attached to the parts in the apparatus can be input while the resin is not surrounded by cold at the end of the work.

As a matter of course, the operation is to release the device, and the odor generated when the resin in the device melts stays around.

In addition, by kneading the molten resin material and the heating aggregate by the mixing means, it is not possible to mutually fill the molten resin material and the aggregate into a sandwich in the mold, and in particular, the molten resin material to be filled Since the coloring which makes the surface layer side into a dichroic color is impossible with respect, there existed inconvenience.

The present invention has the greatest feature of heating the aggregate and the resin separately and putting them into the mold separately or at the same time. Therefore, the scraping and cleaning work can be completely eliminated. Work becomes unnecessary.

In addition, by heating the aggregate and the resin, respectively, and putting them into the mold immediately or simultaneously, the work may be stopped during production, or the work may be resumed even if the product is kept in a warm state because it is not mixed. There is an advantage.

If the material is discharged even if the temperature is not maintained at an appropriate temperature, there is an advantage that it can be reused because it is not mixed with each other.

Therefore, the first object of the present invention is to facilitate temperature control, to evenly spread the molten resin material to the corners of the mold, and to improve the surface finish of the product, and also to improve the molten resin and aggregate in the mold. The present invention provides a method and apparatus for producing a resin molded article which is mutually supplied, or which facilitates coloring of a molten resin of a predetermined layer.

A second object of the present invention is to provide a method for producing a resin molded article and an apparatus thereof capable of suppressing the occurrence of odor to a minimum.

1 is a partially cutaway front view showing a first embodiment of a manufacturing apparatus.

2 is a longitudinal side view of FIG. 1;

3 is a partially cutaway perspective view of the resin molded article.

4 is a partially cutaway perspective view showing another example of a resin molded article.

5 is a partially cutaway front view showing the structure of the simultaneous supply portion of the aggregate and the molten resin;

6 is a front view of a main part showing a second embodiment of the production apparatus;

The front view of the principal part which shows 3rd Embodiment of a manufacturing apparatus.

8 is a partially cutaway front view showing a fourth embodiment of the manufacturing apparatus.

9 is a partially cutaway front view showing a fifth embodiment of the manufacturing apparatus.

-Explanation of symbols for the main parts of the drawings-

(A) ------------------------------ First heating device,

(B) ------------------------------ Second heating device,

(B ') ----------------------------- 3rd heating device,

(C) ------------------------------ Template,

(D) ------------------------------ Press forming apparatus,

(E) ------------------------------ Molded products,

(F) ------------------------------ Conveyor,

(a) ------------------------------ aggregate,

(a ') ----------------------------- metal aggregate,

(b, b ') -------------------------- thermoplastic,

(1) ------------------------------ As a guide,

(2) ------------------------------ drums,

(3) ------------------------------ Drive,

(4) ------------------------------ Hopper,

(5) ------------------------------ Suit,

(6) ------------------------------ burner,

(8) ------------------------------ Hopper,

(9) ------------------------------ casing,

(10) ----------------------------- Drive,

(11) ----------------------------- screw,

(12) ----------------------------- exhaust pipe,

(13) ----------------------------- Band Heater,

(14) ----------------------------- switchgear,

(15) ----------------------------- meter,

(16) ----------------------------- meter,

(17) ----------------------------- Suit,

21 ----------------------------- cylinder,

(22) ----------------------------- pressure plate,

23 ----------------------------- pipe,

(24) ----------------------------- stirring blade,

(31) ----------------------------- Hopper 1,

(32) ----------------------------- Hopper 2,

(33) ----------------------------- switchgear,

(34) ----------------------------- Suit,

35 ----------------------------- meter,

36 ----------------------------- meter,

(37) ----------------------------- Heating means,

(38) ----------------------------- Press forming means,

39 ----------------------------- cylinder,

40 ----------------------------- pressure plate,

(41) ----------------------------- Hopper 3,

42 ----------------------------- Meter.

In the first embodiment of the present invention, as shown in Figs. 1 and 2, the aggregate a is heated in the first heating device A, and the thermoplastic resin b is heated by the second heating device B, respectively. It is.

The first heating device A described above is a drum 2 having a horizontal axis supported by the guide roller 1 so as to be free to rotate therein, and a drive provided to rotate the drum 2 in rotation. The apparatus 3 and the aggregate a which is supplied from the hopper 4 via the chute 5 into one end of the drum 1 and conveyed from one end in the drum 1 to the other end are about 300 to 400 ° C. Although it comprised with the heating burner 6 about the temperature of, it is not limited to the said structure, What is necessary is just to heat up to predetermined temperature, until discharge of the supplied aggregate.

Moreover, as a means for conveying the aggregate a supplied to one end in the drum 1 of the figure toward the other end of the drum 1, in addition to providing a transfer blade (not shown) for agitation in the drum 1, For example, there is a method of tilting the axis of the drum.

In the case of illustration, the said 2nd heating apparatus B is a cylindrical casing 9 of the both ends closed which continuous the storage hopper 8 of the thermoplastic resin b in one end, and between the both ends in this casing 9, and is shown. It can be coupled so as to rotate freely, and the screw 11 driven in one direction by the drive device 10, the discharge pipe 12 communicating with the other end of the casing 9, and the inside of the casing 9 It consists of the band heater 13 which heats a thermoplastic resin to the temperature of 100-200 degreeC, and the thermoplastic resin (b) supplied from the hopper 8 into the one end of the casing 9 by the casing 11 with the casing 9 The molten thermoplastic resin is discharged from the discharge pipe 12 in the molten state during the conveyance, and the thermoplastic resin supplied by other methods may be melted.

As described above, the heated aggregate (a) and the molten thermoplastic resin (b) are introduced into the mold (C) alternately or simultaneously, and then molded while pressurized by the press molding device (D), and the mold (C). The molded product E was prepared as shown in Figs.

As shown in FIG. 1, the molten thermoplastic resin (b) supplied to the meter (15) from the discharge pipe (12) is opened by opening and closing a device (14) such as a valve or a shutter. The switchgear 14 is closed, and then the molten thermoplastic resin (b) after the weighing of the meter 15 is put into the mold c.

On the other hand, the heating aggregate a in the drum 2 is supplied to the meter 16 by opening the switch 14 in the chute 17, and closing the switch 14 when the weight is set while weighing. Since the heating aggregate (a) of the required weight is waiting in (16), the aggregate (a) of the meter (16) is put in the mold (C) conveyed by operation of the conveying conveyor (F) directly under it.

This operation is alternately performed such that the supply of the molten thermoplastic resin (b) and the heating aggregate (a) is sandwiched by the reversible operation of the conveying conveyor (F).

Moreover, in addition to the alternate supply system which becomes the sandwich shape mentioned above, as shown in FIG. 5, the both melt | dissolution melted thermoplastic resin (b) and a heating aggregate (a) are simultaneously supplied to the mold (C) by both the meter (15, 16). have.

Moreover, the said press molding apparatus D is comprised from the cylinder 21 and the pressure plate 22 which raises and lowers by the action of this cylinder 21, and pressurizes the plate 22 toward the inside of the upper surface opening of the mold C. As shown in FIG. ) To lower the pressure. This will prevent more burrs from projecting on the surface.

In 2nd Embodiment of this invention, the molten thermoplastic resin (b) of the 1st layer put into the mold (C) is colored by supply of a pigment.

Then, it is not necessary to color all of the molten thermoplastic resin thrown into the mold C, and coloring of only the surface layer part of the molded product E is attained.

In the above-described coloring method, for example, as shown in FIG. 6, a predetermined amount of pigment is supplied from the pipe 23 into the molten thermoplastic resin (b) supplied to the meter 15, and at the same time, a stirring blade ( Although 24) was stirred, the melted thermoplastic resin, which had been weighed by the meter 15, was introduced into the tank with the stirring wings, the pigment was supplied into the tank, and the colored molten thermoplastic resin was poured into the tank (C). In some cases, it is possible to adopt a method of letting the inflow inside.

In 3rd Embodiment of this invention, the polyethylene-type resin (b ') colored as needed is used for the molten thermoplastic resin thrown into the mold (C).

Then, the molded article E with which the surface of one part or all part is beautiful can be manufactured.

As a means for supplying the said polyethylene-type resin (b '), when the 3rd heating apparatus B' of the same structure as the 2nd heating apparatus B is provided before the 2nd heating apparatus B as shown in FIG. good.

In that case, the supplying thermoplastic resin in the 2nd heating apparatus B uses a thing other than a polyethylene type.

In the fourth embodiment of the present invention, as shown in Fig. 8, the first aggregate 31 has a granular or powdered metal aggregate a ', and the second hopper 32 has a thermoplastic resin b. ) Is putting each.

The metal aggregate a 'in the first hopper 31 and the thermoplastic resin b in the second hopper 2 open and close the opening and closing device 33 from the chute 34 with the opening and closing device 33 such as a shutter. When it is opened and supplied to each meter 35,36 and the capacity | capacitance by the meter 35,36 becomes a predetermined amount, the switchgear 33 is closed and supply is stopped.

The metal aggregate (a ') and the thermoplastic resin (b) which were measured are thrown into the mold (c) which is waiting just under the measuring machines 35 and 36.

The mold c is supported by the conveying conveyor F as shown in FIG. 8, and the metal aggregate a 'and the thermoplastic resin b are alternately supplied by the reversible operation of the conveying conveyor F. FIG. In addition to forming a sandwich, as shown in Fig. 5, the metal aggregate (a ') and the thermoplastic resin from both meters are simultaneously supplied to the mold (c) from one chute.

As described above, the metal aggregate (a ') and the thermoplastic resin (b) supplied to the mold (c) are cast by the metal heating means (37) such as microwave or electromagnetic wave after the movement of the mold (c) is stopped. By heat-generating the metal aggregate (a ') in the form (c) by softening or melting the thermoplastic resin (b) in the form (c) by using the heat of the metal aggregate (a') by heating the metal aggregate (a ') due to the characteristics of the thermoplastic resin. Let's do it.

Thereafter, pressing is performed by the pressing molding means 38 provided immediately below the mold c that has moved forward and stopped.

As shown in FIG. 8, the press-molding means 38 moves up and down by the action of the cylinder 39 and the cylinder 39, and the pressing plate 40 press-fits into the mold c by the drop. It consists of.

The resin molded product (E) manufactured as described above and taken out from the mold (c) is such that the metal aggregate (a ') is present in the surface layer so as to be the same as that shown in FIG. Metal aggregate (a ') is a sandwich shape.

In the fourth embodiment of the present invention, it is possible to supply a pigment to the first thermoplastic resin (b) to be introduced into the mold (c) and to color it.

In the above-mentioned coloring method, the pigment of a predetermined amount is supplied from the pipe 23 to the thermoplastic resin (b) supplied to the meter 15 similarly as shown in FIG. 6, and the stirring blade in the meter 15 ( 24) to stir.

If it stirs, it is not necessary to crush all of the thermoplastic resin (b) thrown into the mold (c).

In 5th Embodiment of this invention, the polyethylene-type resin (b ') colored as needed is used over the thermoplastic resin (b) thrown into the mold (c).

Then, a beautiful molded product of part or all of the surface can be produced. As for supply of the said polyethylene-type resin (b '), as shown in FIG. 9, the accommodation 3 hopper 41 of polyethylene-type resin (b') is provided.

Of course, the chute 34 with the switchgear 33 and the meter 42 are provided in the lower side of the 3rd hopper 41 similarly to 4th Embodiment.

In the aggregate (a) used in the first to third embodiments, finely divided into granules, enamels, solidified materials, powders, or granules in addition to sand and gravel, or shot plast particles, etc. The waste industrial treatment product of this invention is used, and there exists a metal aggregate which also serves as an industrial process, and 4th and 5th embodiment are used.

The fine or powdered metal aggregate (a ') is finely divided into powder or granules, and waste (industrial) treatment such as shot plast particles is used to serve as waste treatment. The molded product (E) is not limited to a plate-shaped body such as road tiles in the city, and is molded according to a target object such as a road material, a block, a sofa block, an ice block, a U-shaped groove, a stopper plate, a braille block, or a dielectric block. Just do it.

As mentioned above, according to the manufacturing method and apparatus of the resin molded article which concern on this invention shown by 1st-3rd embodiment, the aggregate and a thermoplastic resin are heated, respectively, it measures by the quantity according to the usage amount, and it puts in a mold. Therefore, it is possible to freely adjust the input amount (mixed amount) according to the management of the heat and the product, and the input in the mold can be preceded by either the aggregate or the molten thermoplastic resin, or the surface (surface layer) according to the use place of the molded product. Aggregates or thermoplastic resins may be placed on top of each other, or may be alternately added to form sandwiches.

Moreover, since the molten thermoplastic resin of the 1st layer put into a mold can be colored, only the surface layer side of a molded product can be colored.

For this reason, coloring is only a part, and remarkable saving of a pigment is achieved and cost can also be aimed at.

In addition, since polyethylene-based resin is used for the first-layer molten thermoplastic resin to be introduced into the mold, the molten resin tends to spread evenly to every corner of the portion corresponding to the surface of the product in the mold, and the finish of the surface of the finished molded product is finished. In addition, the combinatorial property at the time of coloring becomes easy, and the colored surface can also be finished cleanly.

In addition, depending on the conditions of use of the surface of the finished product, the resin material after the second layer may be a single material or a plurality of materials (mixed materials). That is, when a product is considered that only the surface can be used as the surface of the final product, for example, roadbed, braille block, induction block, and mortar block, the resin material after the second layer is made of plural materials (mixed species). There is no obstacle in this.

Since the resin material in this case only colors the 1st layer with a pigment etc., it is not necessary to color the whole resin, and large consumption saving of a pigment pigment is attained.

In addition, according to the manufacturing method and apparatus of the present invention shown in the fourth and fifth embodiments, the metal aggregate in the mold is microwaved while the metal aggregate in the form of a powder or powder and the thermoplastic resin are respectively weighed and then introduced into the mold. Alternatively, heating is performed by metal heating means such as electromagnetic waves to generate heat, and the thermoplastic resin is softened or melted by pressurization and press-molded, so that it is not necessary to heat the metal aggregate and the thermoplastic resin in advance, thereby maintaining temperature management. Since it is not necessary at all, and the addition into the mold can also be preceded by either one of the particles or powdered metal aggregate and the molten thermoplastic resin, either the particle shape or the powder shape on the surface (surface layer) depending on the place of use of the molded product. Metal aggregates, or thermoplastic resins can be placed or alternately added to form sandwiches. The.

In addition, waste treatment such as shot plast particles and the like can also be performed at the same time.

In addition, by joining the raw materials within the mold, it is possible to minimize the occurrence of odor.

Claims (12)

A method for producing a resin molded article characterized in that the aggregate and the thermoplastic resin are heated separately, and the heated aggregate and the molten thermoplastic resin are weighed, and then press-molded alternately or simultaneously with each other in the mold. The method for producing a resin molded article according to claim 1, wherein the first-layer molten thermoplastic resin to be introduced into the mold is colored by appropriate means. The method for producing a resin molded article according to claim 1, wherein a polyethylene resin colored as necessary is used for the first-layer molten thermoplastic resin to be introduced into the mold. A heating means for heating the aggregate and the thermoplastic resin, a metering means for measuring the heated aggregate and the molten thermoplastic resin, respectively, and injecting the molded aggregate and the molten thermoplastic resin into the mold in turn or simultaneously Apparatus for producing a resin molded article comprising a press molding means for. 5. The apparatus for producing a resin molded article according to claim 4, wherein the first molten thermoplastic resin to be introduced into the mold is colored by a coloring means. 5. The apparatus for producing a resin molded article according to claim 4, wherein the heating means for attaching the weighing means of the polyethylene-based resin for the first layer is placed in the measuring means for heating the thermoplastic resin. The granular or powdered metal aggregate and the thermoplastic resin are alternately or simultaneously introduced into the mold after being weighed at a temperature, respectively, and then the metal aggregate in the mold is irradiated with metal heating means such as microwaves or electromagnetic waves. Heat-generating the pressure-molded thermoplastic resin in the mold by using heat generated by the metal aggregate, followed by press molding. The method for producing a resin molded article according to claim 7, wherein the thermoplastic resin introduced into the mold is colored by appropriate means. The method for producing a resin molded article according to claim 7, wherein a colored polyethylene resin is used as the first thermoplastic resin to be introduced into the mold. Weighing means for measuring the granular or powdered metal aggregate and the thermoplastic resin at an appropriate temperature, respectively, a mold receiving alternating or simultaneous supply of the metered metal aggregate and the thermoplastic resin, and for heating the metal aggregate in the mold. An apparatus for producing a resin molded article comprising metal heating means such as microwaves or electromagnetic waves, and press molding means for forming a softened or molten thermoplastic resin in the mold. 11. The apparatus for producing a resin molded article according to claim 10, wherein the first thermoplastic resin introduced into the mold is colored by a coloring means. 11. The apparatus for producing a resin molded article according to claim 10, wherein the measuring means for the polyethylene resin for further injection is provided in the measuring means for the thermoplastic resin.