JPS60199619A - Press molding of plastic material - Google Patents

Abstract

PURPOSE:To improve the productivity by extruding and supplying the plastic material into a mold in a continuous flat plate varying in the width, broad and narrow, as desired from a nozzle section free to open or close widthwise to shorten the supply time thereof while eliminating the formation of a weld line due to butting. CONSTITUTION:A reciprocation driver 19 is driven to move a material outflow unit 7 to the specified position of a lower die 20 of an open mold 3 of a compression molding machine 2. According to a specified pattern, a specific nozzle body 12 is turned with a opening/closing driver 16 to open the nozzle hole 11 to a specified range and the reciprocation driver 19 is driving at a given speed operating a piston pressure section 10 of the material outflow unit 7 to run plastic material onto the lower die 20 from a nozzle section 13 opened to the specified range. Thus, the plastic material can be extruded and supplied into a compression molding machine quickly in a continuous flat plate varying in the width, broad and narrow, as desired according to the shape of a molding to achieve a higher productivity. This also eliminates the formation of a weld line due to butting thereby permitting the outflow and supply of the plastic material flat.

Description

[Detailed description of the invention] The present invention relates to a method for press molding a plastic material.

BACKGROUND ART It is known as a flow molding method that a plastic material is linearly flowed out of a nozzle, placed on a lower die of a press molding machine in a predetermined pattern, and press-molded.

However, in the conventional flow molding method, the nozzle part is moved like a plotter to extrude and feed the plastic material to the shiveless molding machine as desired, which has a fatal flaw that it takes time to feed the plastic material. There is also a drawback that a weld line is formed due to compression between the lines when the plastic materials that are bent and supplied are butted against each other. Further, it has been impossible to supply the plastic material 1 in a continuous plate shape having an optimal planar wide and narrow width according to the press-formed product as shown in FIGS. 1 and 2.

The present invention has been made in view of the above points, and it is possible to supply a plastic material to a press molding machine in the form of a continuous flat plate with a width that can be widened or narrowed according to the shape of the molded product, thereby shortening the supply time of the plastic material. To provide a press molding method for a plastic material that can be measured and smoothly filled into a mold without forming a weld line due to butting of the plastic material, and which can yield a good molded product with high productivity.Hereinafter, the present invention will be described. will be explained using examples.

8 to 5 show an embodiment of the present invention.

The mold 8, which can be opened and closed, of the press molding machine 2 with a predetermined output includes:
A plastic material supply device 4 is arranged to freely flow out and supply plastic materials such as composite resin materials and composite rubber materials, which are mixtures of thermoplastic or thermosetting resin materials, rubber materials, fibers, etc., into a predetermined flat plate shape. . As shown in FIG. 8, the plastic material supply device 4 is equipped with a hopper 5, and a screw (not shown) is rotated to feed the plastic material into an extrusion device 6 equipped with a heating melter (not shown) such as a band heater. It is formed by disposing a material outflow device 7 for outflowing and supplying material in a plate shape. The material outflow device 7 is
It is a cylindrical cylinder with a rectangular cross-section and a predetermined wide width that is the same as or slightly narrower than the width of the mold 8. The shut-off pulp 8 is disposed in the middle part of the cylinder, and the extrusion device 6 is connected to the extrusion device 6 through a bendable and expandable connecting pipe 9. The plastic material pushed into the material outflow device 7 is forced forward by the piston suppressing portion 1O. At the front of this wide rectangular cross-sectional material outflow device 7, there is a nozzle hole in the center as shown in FIGS. 4 and 5! A cylindrical nozzle part 18 formed by connecting a number of narrow disc-shaped nozzle bodies 12 with holes 1 is fitted therein, and a tooth-shaped nozzle part 18 is fitted in the upper part of each disc-shaped nozzle body 12. Driven parts 14 are respectively provided, and each nozzle body 12 can be opened and closed by an opening/closing drive device 16 such as a miniature swing cylinder via a pinion 15 via a rack and pinion machine, etc., and the flow at the front end is controlled. A desired width of plastic material can freely flow out from the outlet 17. Further, a sliding rail/I/18 is provided at the bottom of the material outflow device 7, and the material outflow device 7 can be freely moved back and forth a predetermined distance with respect to the press molding machine 2 by a reciprocating drive device 19 such as an electric servo motor. The plastic material can be appropriately fed into the open lower mold 20 of the mold 3 of the press molding machine 2 in the form of a flat plate.

In order to supply the plastic material to the press molding machine 2, the plastic material loaded into the hopper 5 with a predetermined filler mixed therein is extruded by the extrusion device 6 and the material outflow device 7
Fill it. Then, the reciprocating drive device 19 is driven to move the material outflow device 7 to the lower mold 2 of the open mold 3 of the press molding machine 2.
0 to a predetermined position, the predetermined nozzle body 12 is rotated by the opening/closing drive device 16 according to a predetermined pattern to open the nozzle hole 11 to a predetermined width, and the piston suppressing part 10 of the material outflow device 7 is actuated. At the same time, the reciprocating drive device 19 is driven at a predetermined speed, and the plastic material is discharged onto the lower mold 20 from the nozzle portion 18 having a predetermined width. By operating the above-mentioned apparatus as appropriate through program control or the like, it is possible to easily obtain material supply in a wide and narrow pattern with non-uniform width as shown in FIGS. 1 and 2. In addition, if the opening degree of the nozzle part, the opening/closing width, the moving speed of the material outflow device, and the extrusion speed of the piston suppressing part are controlled by various programs using computer processing, various appropriate patterns of plastic material outflow can be created. supply. In particular, in this example, since the nozzle part is moved one-dimensionally, it is easy to create a program and control the device, and the plastic material can be supplied in a short time. The formation of weld lines due to such butting of plastic materials does not occur.

Furthermore, by opening and closing the center of the nozzle part, it is possible to form a pattern with an opening 21 in the center as shown in FIG. It is also possible to appropriately form a thick wall portion 22 in a portion to change the shape of the structure or to form a protruding portion of a rig portion or a dowel portion.

Furthermore, in the above embodiment, the plastic material was flowed out and supplied without going through the metering extrusion device, but it is also possible to connect a metering extrusion device to the material outflow device to extrude a predetermined amount of the plastic material. It is.

Furthermore, in the above embodiment, a large number of nozzle bodies are connected to the nozzle part, and each nozzle body can be opened and closed to supply a predetermined width of plastic material. Alternatively, a double door or a double shutter type door can be provided at the front end of the nozzle section to supply the plastic material in a desired width.

As described above, in the present invention, the RJffi material can be supplied to the press molding machine in a short time in the form of a continuous flat plate with an appropriate width depending on the shape of the molded product, and it can be smoothly inserted into the mold. This allows fluid filling and improves productivity. Further, since the plastic material can be flowed out and supplied in one plane without forming a p-drain line due to butting, a good molded product with uniform strength can be obtained.

[Brief explanation of drawings]

1 and 2 are respectively plan views of an embodiment of the desired desiccant particle outflow pattern of the present invention, FIG. 3 is a partially omitted schematic plan cross-sectional view of the same device, and FIG. The 51st wing is an enlarged side sectional view and a plan sectional view of the nozzle part as above, FIGS. 6 and 7.
The figure is a plan view of another outflow pattern same as above, and No. 8M is a sectional view from the center side of FIG. 7. l...Plastic material, 2...Press molding machine, 3...
Mold, 7... Material outflow device, 13... Nozzle section. Applicant Kawasaki Oil Company Agent Patent Attorney Kuni Morimoto Car box 1 Figure 2 Figure 4 Figure 5 Figure 6 Figure 1 Figure 7

Claims (1)

[Claims] (The nozzle part of the material outflow device that supplies plastic material to the press molding machine has a predetermined wide width, and the nozzle part can be adjusted to open and close in the width direction so that the plastic material can flow out in a wide and narrow width. The plastic material is then extruded and fed into a mold according to the desired press-formed product in a continuous flat plate shape with wide and narrow widths without forming a weld line by butting the plastic material into a press-forming machine to form the desired press-formed product. Press molding method for plastic materials.