JPS599332B2 - Hollow plate extrusion molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a thermoplastic synthetic resin as a raw material to produce a hollow plate-like body composed of two parallel plates and a plurality of partition walls connecting these two plates, using an extrusion molding method. This relates to the improvement of equipment manufactured by.

Conventionally, many extrusion molding devices for hollow plate-shaped bodies of this type have a fixed extrusion die and a torpedo provided at the tip of the die, and the molded products obtained by extrusion molding with such devices are usually If the extrusion conditions are as follows, only a fixed width can be obtained.

When adjusting the width of a molded article using a conventional extrusion molding apparatus, the width dimension is adjusted by adjusting the take-up speed of the molded article extruded from a die. However, the width of the molded product that can be adjusted by such a method is only a few percent at most, and can only be adjusted in a direction that reduces the width of the extruded molded product. In addition, when extruding such a hollow plate-shaped body, a sizing device is usually installed in front of the extrusion molding die, and the upper and lower plates of the hollow plate-shaped body extruded from the die are cooled while being sucked. There are also known devices that stabilize the shape and dimensions of hollow plate-like bodies by, for example,
In order to adjust the width of a molded product using such a sizing device, a method is used to adjust the distance between the extrusion molding die and the sizing device. In such cases, the shape of the molten resin outlet of the extrusion molding die is usually set to the desired product dimensions, so if you try to adjust the dimensions of the hollow plate by the method described above, If the amount is too large, not only will the molded product break during the molding process, making the work difficult, but the shape and dimensions of the final product may not be stable, or the product may become oriented. However, there was a drawback that a good product could not be stably obtained. In addition, if you have a large number of dies to match the width of the product you are trying to obtain, you can obtain products with different widths depending on the dimensions of the die. However, when trying to obtain products whose widths differ by several percent, a large number of expensive dies must be prepared, which is extremely uneconomical and increases the product cost. The inventors of the present invention have conducted intensive studies to solve the above-mentioned drawbacks and to provide an extrusion molding device that can mold several types of products with different widths using a single extrusion molding device. We discovered that the above problems could be solved by creating a special structure for the tip of the die that is attached to the tip of the molding machine and that molds and discharges thermoplastic synthetic resin, and completed the present invention. I came to the conclusion.

That is, the gist of the present invention is to manufacture a hollow plate-like body made of thermoplastic synthetic resin, which is composed of two parallel plates and a plurality of partition walls connecting these two plates, by an extrusion molding method. In the device, a hollow plate-shaped body is constructed in which the width of the hollow plate-shaped body can be adjusted by allowing the most side torpedo of a plurality of torpedoes provided at the tip of the die to be exchanged with a side stopper corresponding to the torpedo. Extrusion molding equipment.

The thermoplastic synthetic resin molded into a hollow plate by the apparatus of the present invention may be any thermoplastic synthetic resin that can be normally molded by extrusion, such as polystyrene, polyethylene, polypropylene, polyvinyl chloride, etc. , nylon, and other appropriate thermoplastic synthetic resins are used, but from the viewpoint of moldability and strength, styrenic resins such as rubber-reinforced polystyrene, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene ternary copolymer, etc. And mixtures of these resins and other thermoplastic resins can be suitably used. In addition, antioxidants, ultraviolet absorbers, heat stabilizers, antistatic agents, crosslinking agents, blowing agents, dyes, pigments, organic/inorganic fillers, etc. are added to these resins in types and amounts that do not adversely affect product quality. Of course, other additives may also be mixed. Next, the apparatus of the present invention will be explained in detail with reference to the drawings, but the present invention is not limited to the following examples unless it exceeds the gist thereof.

FIG. 1 is a front view of an example of the molding apparatus of the present invention, and FIG.
3 is a schematic diagram of the same drawing as in FIG. 1 when the torpedo and side stopper 1 have been replaced; FIG. Figures 5A and 3A show front and side views of the side stopper shown in Figure 3, respectively, and Figures 6A and 6A show the front and side views of the side stopper shown in Figures 1 and 3, respectively. A vertical cross-sectional view of a product made with the device is shown.

In the figure, 1 is the die body, 2 is the outermost torpedo,
3 is the center torpedo, 4 is the torpedo mounting bolt,
5 is the sight plate, 6 is the side plate mounting bolt, 7 is the die lip pro gold, 8 is the die lip mounting bolt,
9 is a lip adjustment bolt, 10 is a lip adjustment nut,
Reference numeral 11 indicates a spider, 12 a flow divider plate, and 13 a resin passage. The die body 1 is attached to the tip of an extruder (not shown), and a thermoplastic synthetic resin melted and delivered from the extruder is introduced into the die body 1.

The molten resin introduced into the resin passage 13 in the die body 1 is divided vertically by the flow divider plate 12, and is extruded through the spider 11 from the gap formed by the Dairitsupro gold 7 and the torpedoes 2 and 3. It is considered to be a hollow plate-shaped body. A torpedo is attached to the die body 1, and this torpedo consists of a center torpedo 3 and an outermost torpedo 2. Dairitsurou gold 7 is attached to the top and bottom of the torpedo, and side plates 5 are attached to both ends of the torpedo. It becomes.

Two parallel plates are extruded from the gap formed by the torpedoes 2 and 3 and the Dairitsururo gold 7, and a plurality of partition walls connecting the above-mentioned plates are extruded from the gap formed between each torpedo. Extruded. Most side edge and center torpedo 2
, 3 are attached to the spider 11 with torpedo attachment bolts 4, and are fixed in the center of the molten resin passage into which the resin flow passage 13 is fed.

Each of the torpedoes 2 and 3 may be mounted independently using torpedo mounting bolts, but in order to make the intervals uniform, the central torpedo 3 is preferably integrated near the part where it contacts the spider 11. preferable. The die lip prong 7 is attached to the die body 1 with a die lip attaching bolt 8, and is movable so that the plate forming gap formed between the toe beads 2 and 3 can be adjusted.

This adjustment is performed by slightly loosening the die lip mounting bolt, rotating the lip adjusting nut 10, and adjusting the length of the lip adjusting bolt 9. In the hollow plate extrusion molding apparatus according to the present invention, the outermost torpedo 2 and the side plate 5 are removably attached to each other by torpedo attachment bolts 4 and side plate attachment bolts 6, and the hollow plate extrusion molding apparatus has different dimensions. It is made to be replaceable when manufacturing the body.

That is, when manufacturing a wide hollow plate-like body as shown in FIG. 1, the widest end torpedo 2 and its corresponding surface as shown in FIG. Install side plate 5.

When manufacturing a narrow-width hollow plate-like body as shown in Fig. 3, a torpedo 2 at the outermost end with a small width and a corresponding side plate with one side protruding as shown in Fig. 5 5 should be installed. The above example is an example of replacing the torpedoes on both sides of the die body and the corresponding sight plate, but by replacing only the torpedoes on one side of the die body and the corresponding side plate, the width of the hollow plate-shaped body can be changed. may be adjusted. In addition, although what is shown in the figure is a case where the width of the hollow plate-like body is narrowed, the outermost torpedo 2 is made wider than the smaller one shown in Fig. 1, and a corresponding recess is provided in the side plate 5. The first
It is also possible to obtain a hollow plate having a wider width than the hollow plate shown in the figure.

In any case, the resin constituting the side end portion of the hollow plate-shaped body regulated by the side plate 5 is extruded from a fixed position regardless of the type of the site plate 5.
The thickness of the part of the sight plate 5 that first comes into contact with the resin (the left end of the side plate 5 shown in FIGS. 4 and 5) must be the same, and the thickness beyond that part (the left end of the side plate 5 shown in FIGS. 4 and 5) must be the same. Fifth
The structure is such that the resin is guided in an appropriate direction at the right end of the side plate 5 shown in the figure.

In this way, according to the present invention, since the torpedo 2 at the outermost end and the corresponding sight plate 5 are replaceable, it is possible to obtain products with different widths at intervals of several percent. In this case, it is only necessary to select the sidemost torpedo and the corresponding side plate, and there is no need to prepare a large number of dies with different dimensions as in the conventional case.

Further, when manufacturing a hollow plate-shaped body using the apparatus according to the present invention, there is no need to increase the amount of drawdown as with conventional apparatuses, and the forming operation can be smoothly performed. In addition, the hollow plate-like body obtained by the device of the present invention has the characteristics of stable product shape and dimensions, and has little directionality, and has extremely high industrial utility value. be.

[Brief explanation of the drawing]

Fig. 1 is a front view of the molding apparatus according to the present invention, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is the same as Fig. 1 when the torpedo and side stopper have been replaced. Schematic representations of similar drawings, FIG. 4A, a front view and side view of the side stopper shown in FIG. 6A and 6B respectively show longitudinal cross-sectional views of products made with the apparatus shown in FIGS. 1 and 3. In the figure, 1 is the die body, 2 is the outermost torpedo,
5 indicates the side plate, and 7 indicates Dairitsu Pro Gold.

Claims (1)

[Claims] 1. In an apparatus for manufacturing a hollow plate-shaped body made of thermoplastic synthetic resin by extrusion molding, which consists of two parallel plates and a plurality of partition walls connecting these two plates, a A hollow plate extrusion molding apparatus having a structure in which a torpedo at the outermost end of a plurality of torpedoes and a side stopper corresponding to the torpedo are exchangeable, and the width of the hollow plate can be adjusted.