JPS623911A - Filling foaming material in cavity of pipe-shaped synthetic resin molding material - Google Patents

Abstract

PURPOSE:To make it possible to fill a foaming material uniformly and efficiently into a cavity of pipe-shaped synthetic resin molding material, by using a conduit receiving and sending a heat-setting liquid foaming material as a medium and by supplying continuously the liquid foaming material with the medium into the cavity of pipe-shaped synthetic resin molding material extruded from a metal mold. CONSTITUTION:A liquid foaming material 9 is continuously supplied with a conduit for delivering 20 into a cavity 7 of the molding material 6 at the outlet of a guide path 15 and the molding material 6 is thereafter guided to a path for molding 10. The liquid foaming material 9 vigorously foams near the entrance part 25 as the molding material is being kept at high temp. and quickly fills in the cavity 7. As a part of the foaming body 26 comes to extrude to the backside of the sheet material 17 naturally or by the influence of the foaming pressure after the conduit for delivering 20 enters into the cavity 7 for the guide path 15, the adhesion of the sheet material 17 to the inner surface is improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a synthetic resin molding in the shape of a pipe extruded from a mold using a conveying trough-like body for receiving a thermosetting liquid foam as a medium. This invention relates to a method for filling a hollow part of a pipe-shaped synthetic resin molded material with a foam, by continuously supplying a liquid foam together with the medium into a hollow part of the material, and causing the liquid foam to foam within the hollow part.

(Background of the Invention) When a synthetic resin molded body filled with foam is continuously manufactured, when the molded material extruded from a mold has a pipe shape, a crosshead as shown in Fig. 2 is used. Using an extrusion molding machine, it is necessary to continuously supply thermosetting liquid foam into the cavity of the extruded molding material. During this supply, the liquid foam is heated in the crosshead and mold part, and a part of it foams and hardens, so it is essential to solve this problem in order to obtain the desired molded product. be.

The present invention cleverly solves this problem by using a conveying trough-like body for receiving the liquid foam as a medium and supplying the liquid foam together with the medium into the cavity of the molding material. The object of the present invention is to provide a method (hereinafter referred to as "method") of filling a foam into a cavity of a synthetic resin molding material.

(Structure) In the method of the present invention, thermosetting resin is added into the cavity 7 of a thermoplastic synthetic resin molding material extruded from a mold to form a pipe shape (circular pipe shape, square pipe shape, various irregular pipe shapes). When filling the plastic foam, the liquid foam 9 is injected onto the conveying gutter-like body 20 formed using the sheet material 17, and the liquid foam 9 is poured into the molded material 6 together with the conveying gutter-like body 20. The liquid foam 9 is continuously supplied into the cavity 7 to foam the liquid foam 9 within the cavity 7.

(Example) Examples of the present invention will be specifically described below based on the drawings.

The method of the present invention uses a conveying gutter-like body for receiving thermosetting liquid foam as a medium when continuously producing a synthetic resin molded body 2 filled with a foam 1 as shown in FIG. , the liquid foam is continuously supplied together with the medium into the cavity of the molding material 6, and the liquid foam is foamed within the cavity.

2 to 4 are explanatory diagrams showing the implementation state of the present invention, and 3
5 is a cross-head extrusion molding machine; 5 is a supply unit for continuously supplying the liquid foam 9 into the cavity 7 of the molding material 6; 10 is a cross-head extrusion molding machine;
11 is a molding passage, and 11 is a take-off device for taking off the molded body 2.

The extrusion molding machine 3 extrudes thermoplastic synthetic resin such as vinyl chloride in a molten state from a mold 12 to a high temperature. A (approximately 50℃~2
(approximately 50°C) and is extruded as a molded material 6 in a flexible state. The molding material 6 is formed, for example, into the shape of a rectangular cylindrical pipe as shown in FIG.

As shown in FIGS. 3 and 4, the liquid foam supply section 5 includes a front guide path 15a having a U-shaped cross section formed in the crosshead 13 and the mold 12, and a core guide path 15a. A guide path 15 consisting of a rear guide path 15b having a U-shaped cross section and formed to protrude from the cross head 13 so as to be continuous with the cross head 13.
The sheet material 17 wound around a roll 16 rotatably installed outside the end of the rear guide path 15b is unwound and can move along the guide path 15 while forming a gutter-like shape. Thermosetting liquid foam 9, such as polyurethane resin, phenol resin, polyester resin, etc., is applied from the nozzle 19 onto the formed conveying trough-like body 20 at the entrance end of the guide path 15. Liquid foam is continuously injected. The sheet material 17 forming the conveyance gutter-like body 20 can withstand heating in the crosshead 13 portion, prevents the liquid foam 9 from seeping out at least while moving through the guide path 15, and has appropriate strength. In addition, it is formed using materials such as paper, cloth (13i cloth, nonwoven fabric, etc.), thin metal foil, and synthetic resin film.

However, when the liquid foam 9 is injected into the conveying trough-like body 20 moving along the guide path 15, as shown in FIG.
At the outlet end of 5, the liquid foam 9 passes through a conveying trough 20.
and is continuously supplied into the cavity 7 of the molding material 6,
Thereafter, the molding material 6 is guided into the molding passage 10. As shown in FIG. The cross-sectional shape of the passageway 10 is formed to be the same as the outer shape of the molded body 2.Both the lower mold 22 and the upper mold 23 are formed as cylindrical bodies having an inner and outer double wall structure, and cooling is performed between them. The medium 24 is circulated.The upper die 23 is pressed by a pressing device (not shown) with a pressing force that can resist the foaming pressure of the foam.

Since the molding material 6 is in a high temperature state, the injected liquid foam 9 rapidly foams in the vicinity of the entrance 25 of the molding passage 10, rapidly filling the cavity 7. In the figure (see cl), foaming is almost completed at the portion near the inlet portion 25 (see FIG. 5(d)). In the molding passage 10, as the liquid foam foams, the foam 1 presses the wall of the molding material 6 toward the wall of the molding passage 10, as shown in FIG. Therefore, the molding material 6 can be automatically molded into a shape corresponding to the cross section of the molding passage 10, that is, into the preset outer shape of the molded body 2. At this time, the conveying gutter-like body 20 It collapses and is pressed against the wall inner surface 27 as shown in FIG.
When formed using a sheet material made of paper or cloth (woven fabric, non-woven fabric, etc.), the conveying gutter-like body 20 is connected to the guide path 1.
After penetrating into the cavity 7 from the foam member 5, a portion of the foam member 26 naturally or by the action of foaming pressure forms a part of the sheet member 17.
Since it will seep out a little to the back side of the sheet material 17, the adhesion to the wall inner surface 27 of the sheet material 17 will be good. Further, when a glass fiber cloth is used as the sheet material 17, the strength of the molded body can be improved.

FIG. 6 illustrates a molded body 2 as a panel joint material manufactured using the method of the present invention, for example, a panel 29. The foam 1 that is used and filled in to join each other provides excellent heat insulation at the panel (insulation board) joint portion 30.

(Effects of the Invention) Since the method of the present invention is as described above, it is possible to easily and continuously supply the liquid foam into the cavity of the extruded molding material, and it is possible to easily and continuously supply the liquid foam into the cavity of the extruded molding material. A resin molded body can be manufactured efficiently and inexpensively in a uniform state.

[Brief explanation of the drawing]

FIG. 1 is a perspective view illustrating a molded article manufactured by the method of the present invention, FIG. 2 is a plan view of an apparatus used in the manufacturing method of the present invention, and FIG. 3 is a state of molding by the apparatus shown in FIG. 2. FIG. 4 is a perspective view showing the injection state of the foam onto the conveying trough-like body, and 5(a) to fd) are the states of supply of the liquid foam into the cavity of the molding material. FIG. 6 is a cross-sectional view illustrating a molded body as a panel joint material manufactured by the method of the present invention. 6... Molding material, 7... Cavity, 9... Liquid foam, 20... Conveying gutter-like body.

Claims (1)

[Claims] When filling the thermosetting foam 1 into the hollow part 7 of the pipe-shaped thermoplastic synthetic resin molded material 6 extruded from the mold, a conveying gutter-shaped sheet material 17 is formed using the sheet material 17. A liquid foam 9 is injected into the body 20, and the liquid foam 9
The hollow portion 7 of the molding material 6 together with the conveying gutter-like body 20
A method for filling a hollow part of a pipe-shaped synthetic resin molding material with a foam, characterized by continuously supplying a liquid foam 9 into the hollow part 7 and foaming the liquid foam 9 in the hollow part 7.