JP2000289084A - Extrusion mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the flow adjusting speed of a molten resin and to enhance the shape and accuracy of a molded article. SOLUTION: In an extrusion mold provided with an attaching adaptor plate 11, developing plates 12, 13 reducing the cross-sectional area of a resin flow channel gradually and a leading end plate 14 for molding the shape of a product, a resin flow rate adjusting device increasing and decreasing the resin flow resistance of the resin flow channel is provided to the developing plate 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for extrusion molding, and more particularly to a die for extrusion molding suitable for forming a molded article.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Unexamined Patent Publication No.
As described in Japanese Patent Application Laid-Open Publication No. H10-163, there is known an extrusion molding die in which a resin flow path is provided inside and an extrusion port is provided at a tip end.

As a conventional mechanism for adjusting the resin flow in the resin flow path inside the extrusion mold, a method of adjusting the clearance of the flow path parallel portion at the tip of the mold with a plurality of bolts is employed.

A conventional mechanism for adjusting the resin flow in the resin flow path inside the extrusion mold employs a method of adjusting the clearance of the flow path parallel portion at the tip of the mold with a plurality of bolts.

However, in a system in which the clearance of the flow path parallel portion at the tip of the mold is adjusted by a plurality of bolts as in a conventional extrusion mold, the adjustment mechanism itself becomes large. The mold as a whole is also large, and has the disadvantage of high costs including manufacturing costs.
Further, in the method of adjusting the clearance of the flow path parallel portion at the tip of the mold by using a plurality of bolts, there is a disadvantage that the adjustment cannot be completed if the cross-sectional shape of the molded product becomes complicated as in the case of a deformed product.

The present invention has been made in view of such a problem in a conventional extrusion molding die.
It is an object of the present invention to solve the above-mentioned problems and to provide an extrusion molding die capable of speeding up the flow adjustment of a molten resin and improving the shape and accuracy of a molded product.

[0006]

In order to achieve the above-mentioned object, an extrusion mold of the present invention forms a product shape with a mounting adapter plate, a development plate for gradually reducing the cross-sectional area of a resin flow path. In an extrusion molding die provided with a tip plate, a resin flow rate adjusting device for increasing / decreasing a resin flow resistance in a resin flow path is provided in a development portion plate.

[Operation] In the extrusion molding die of the present invention, since the resin flow rate adjusting device for increasing or decreasing the resin flow resistance is provided in the resin flow path in the developing portion plate, the resin pressure is changed by the resin flow rate adjusting device. And a good resin flow balance can be achieved.

[0008]

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view showing an example of the extrusion molding apparatus of the present invention, FIG. 2 is a plan view of the extrusion molding die of the present invention shown in FIG. 1, FIG. 3 is a cross-sectional view taken along line III-III of FIG. It is a right view of the extrusion molding apparatus of this invention shown in FIGS.

1 to 4, reference numeral 1 denotes an extrusion molding die of the present invention, and 11 denotes an adapter plate for mounting the extrusion die 1 of the present invention. It can be installed. Reference numeral 111 denotes a resin flow path provided inside the mounting adapter plate 11.

Reference numeral 12 denotes a first developing portion plate provided adjacent to the mounting adapter plate 11, reference numeral 13 denotes a second developing portion plate provided adjacent to the first developing portion plate 12, and reference numerals 121 and 131 denote the same. The resin flow paths are provided inside the first development section plate 12 and the second development section plate 13, and the resin flow paths 121 and 131 are gradually reduced in the extrusion direction indicated by the arrow a.

Reference numeral 14 denotes a tip plate provided adjacent to the second developing plate 13; 141, a resin flow path provided inside the tip plate 14; It has a cross-sectional shape that substantially matches the cross-sectional shape. Reference numeral 142 denotes an extrusion port provided at the tip of the tip plate 14.

Reference numerals 2, 3, 4, and 5 denote second developing portion plates 13
2 is a flow rate adjusting core of the resin flow rate adjusting device provided in the first embodiment.
As shown in FIG. 5 and FIG.
Threaded rods 21, 31, 4 with external threads engraved on 3, 4, 5
1, 51 are provided, and the threaded rods 21, 31, 41, 51 are screwed into female threads of the threaded pipe 12 provided in the second developing section plate 13, and the gripping parts 22, at the tips of the threaded rods 21, 31, 41, 51, By gripping and rotating 32, 42, and 52, reciprocation can be performed as shown by an arrow b.

That is, by gripping the gripping parts 22, 32, 42, 52 and screwing the screw rods 21, 31, 41, 51, the flow regulating cores 2, 3, 4, 5 are connected to the second developing plate 1
3, the resin flow path 131 can be reduced from all directions, and the flow control cores 2, 3, 4, 5 are loosened by loosening the screw rods 21, 31, 41, 51, whereby the flow developing cores 2, 3, 4, 5 are formed in the second development section. It retreats from the inside of the resin channel 131 of the plate 13 so that the resin channel 131 can be expanded from all sides.

In the extrusion molding die of the present invention shown in FIGS. 1 to 4, the grippers 22, 32, 42, 52 are gripped and the screw rods 21, 31, 41, 51 are rotated in any direction. Thereby, the resin flow path 131 can be reduced or expanded, and the resin flow rate in the resin flow path 131 can be adjusted.

FIG. 7 is a sectional view showing another example of the extrusion mold of the present invention. In the extrusion molding die 1a of the present invention shown in FIG. 7, the flow regulating core 2 is provided only above the resin flow path 131 of the second developing portion plate 13.

Although the embodiment of the present invention has been described with reference to the drawings, the specific configuration of the present invention is not limited to the illustrated embodiment, and the design change within a scope not departing from the gist of the present invention. Are included in the present invention.

For example, instead of providing the flow rate adjusting core on the second developing plate 13 as in the illustrated embodiment,
It may be provided on the first developing portion plate 12 or on both the first developing portion plate 12 and the second developing portion plate 13. Also, as in the illustrated embodiment,
Instead of providing the first developing section plate 12 and the second developing section plate 13, one developing section plate may be provided.

[0018]

According to the extrusion molding die of the present invention, since the resin flow rate adjusting device for increasing or decreasing the resin flow resistance is provided in the resin flow path in the developing portion plate, the resin pressure is changed by the resin flow rate adjusting device. The resin flow balance can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an extrusion mold according to the present invention.

FIG. 2 is a plan view of the extrusion mold of the present invention shown in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a groove side view of the extrusion molding die of the present invention shown in FIGS.

FIG. 5 is an enlarged sectional view showing a second development plate of the extrusion molding die of the present invention shown in FIGS.

FIG. 6 is an enlarged perspective view showing a flow rate adjustment core of the extrusion molding die of the present invention shown in FIGS.

FIG. 7 is a sectional view showing a main part of another example of the extrusion mold of the present invention.

[Explanation of symbols]

 Reference Signs List 1, 1a Extrusion mold 11 Adapter plate 111, 121, 131, 141 Resin flow path 12 First developing part plate 13 Second developing part plate 132 Screw tube 14 Tip part plate 2, 3, 4, 5 Flow rate adjustment core 21, 31, 41, 51 Screw rod 22, 32, 42, 52 Holding part

Claims (1)

[Claims] In an extrusion molding die provided with a mounting adapter plate, a development plate for gradually reducing the cross-sectional area of a resin flow path, and a tip plate for molding a product shape, a resin flow is applied to the development plate. An extrusion molding die, wherein a resin flow rate adjusting device for increasing or decreasing the resin flow resistance is provided in a path.