JPH0473123A - Flow rate adjusting device for extrusion mold and simultaneous extrusion device for a plurality of molding - Google Patents

Abstract

PURPOSE:To adjust the flow rate of resin in a good manner by inserting a cylindrical land component into a rear end of an peripheral face of an inner cylinder, also inserting a bar- shaped tool from notched holes of an outer cylinder into a recessed section of the inner cylinder, screwing the inner cylinder and moving the same forward and backward. CONSTITUTION:A plurality of notches 14 are formed on an outer cylinder 11 in the peripheral direction, and a slot-shaped recessed sections 16 are formed in the position corresponding to the notches holes 14 on the outer peripheral face of an inner cylinder 12. The land length of the inner cylinder 12 is shorter than the land length of the outer cylinder 13, and the inner cylinder 12 is screwed movably forward and backward on the inner peripheral face of the outer cylinder 11. A cylindrical land component 13 is inserted with its outer peripheral face rubbed with the inner peripheral face of the rear end of the inner cylinder 12. This flow rate adjusting device 10 is installed between an extruder and an extrusion mold, and the bar-shaped tool is inserted from the notched holes 14 into the recessed section 16, and the inner cylinder 12 is screwed and moved to adjust the flow rate of resin. The flow rate adjusting device 10 is installed between an extruder 20 and at least one extrusion mold 30 of a simultaneous extrusion device for a plurality of moldings on which a plurality of extrusion molds 30 and 31 are mounted.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a flow rate adjustment device for an extrusion mold for producing thermoplastic resin molded products, and a simultaneous extrusion device for multiple molded products using this flow rate adjustment device. Regarding.

(Prior Art) For example, Japanese Patent Application Laid-Open No. 118224/1983 discloses a thermoplastic resin extruder and a device for simultaneously extruding multiple thermoplastic resin molded products having different shapes and sizes using one extrusion device. Between each of the plurality of extrusion molds, a resin flow passage hole is provided, a flow rate adjustment plunger is provided so as to protrude into the flow passage hole, and the amount of protrusion of this flow rate adjustment plunger is adjusted. An apparatus configured to extrude a plurality of molded products from an extrusion die at a constant speed has been proposed.

(Problem to be Solved by the Invention) However, in the conventionally proposed apparatus for simultaneously extruding multiple molded products, since a flow rate adjustment plunger protrudes from the resin flow path hole, the flow rate adjustment plunger prevents melting. Resin flow is obstructed.

Therefore, if the thermoplastic resin to be extruded is a resin that easily decomposes, such as vinyl chloride resin, a resin that has poor fluidity, or an additive that easily decomposes in the resin, these resins or The conventional equipment described above is unsuitable because the additives decompose or cause extrusion fluctuations. Furthermore, the conventional device described above also has the disadvantage that a portion of the flow rate adjustment plunger is relatively large.

The present invention solves the above-mentioned problems, and its purpose is to prevent the flow of molten resin from being obstructed, the resin or additives from decomposing, or extrusion fluctuations.
It is an object of the present invention to provide a flow rate adjustment device for an extrusion mold and a simultaneous extrusion device for a plurality of molded products, which can satisfactorily adjust the flow rate of resin with a simple structure.

(Means for Solving the Problems) The extrusion die flow rate adjustment device of the present invention is an extrusion die flow rate adjustment device provided between a thermoplastic resin extruder and an extrusion die, and the extrusion die flow rate adjustment device is provided between a thermoplastic resin extruder and an extrusion die. The adjustment device is screwed into an outer cylinder and an inner peripheral surface of this outer cylinder so as to be movable back and forth, and has a land length shorter than the land length of the outer cylinder and an inner peripheral surface of the inner cylinder at the rear end thereof. A notch hole is formed in the outer cylinder, a recess is formed in the threaded surface of the inner cylinder at a position corresponding to the notch hole in the outer cylinder, and a notch hole in the outer cylinder is formed. The present invention is characterized in that the inner cylinder is moved back and forth by inserting a rod-shaped tool into the recess of the inner cylinder through the hole and twisting the inner cylinder, thereby adjusting the flow rate of the resin.

Moreover, the simultaneous extrusion apparatus for multiple molded products of the present invention is a simultaneous extrusion apparatus for multiple molded products in which a plurality of extrusion molds are attached to a thermoplastic resin extruder, and the extrusion machine and at least one extrusion mold The above-described flow rate adjustment device is provided between the flow rate adjustment device and the flow rate adjustment device.

(Function) In the eL amount sub-adjustment device and simultaneous extrusion device of the present invention, the inner cylinder is moved forward (see Fig. to the left)
When moved to , the land of the outer cylinder (L+ in Fig. 1) becomes shorter and the land of the inner cylinder (L+ in Fig. 1 becomes longer. As a result, the flow rate of the molten resin in the cylinder decreases. , when the inner cylinder is moved rearward (rightward in FIG. 1), the flow rate of the molten resin decreases.

Further, since there are no protrusions in the resin flow path within the flow rate adjustment device, a smooth resin flow path is formed and the flow of molten resin passes smoothly without being obstructed.

(Example) The apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of a flow rate adjusting device for an extrusion die according to the present invention, and FIG. 2 is an exploded view of the device shown in FIG. 1. In these figures, reference numeral 10 denotes a flow rate adjusting device, which is composed of an outer cylinder 11, an inner cylinder 12, and a cylindrical runt member 13.

For example, five notch holes 14 of an appropriate size are formed in the outer cylinder 11 in the circumferential direction, and a threaded part 15 is formed in the inner circumferential surface of the outer cylinder 11 from halfway to the rear (to the right in the figure). has been done. In addition, the outer peripheral surface of the inner cylinder 12 is provided with a notch hole 1 of the outer cylinder 11.
For example, twelve long groove-shaped recesses 16 of appropriate size are formed in the circumferential direction at positions corresponding to the inner cylinder 12, and a threaded portion 17 is formed in the outer peripheral surface of the inner cylinder 12 from the middle toward the rear.

In this case, the land length of the inner cylinder 12 is made shorter than the land length of the outer cylinder 11, so that the land of the outer cylinder 11 (Lυ in Fig. 1) and the land of the inner cylinder 12 (glue in Fig. 1) are formed. The notch hole 14 of the outer cylinder 11 and the inner cylinder]2
The number, shape, and position of the recesses 16 are not limited to the above examples; in short, the inner cylinder 12 can be twisted by inserting a rod-shaped tool from the notch hole 14 of the outer cylinder 11 into the recess 16 of the inner cylinder 12. It is sufficient if they are formed at positions corresponding to each other.

The threaded portion 15 of the outer cylinder 11 and the threaded portion 17 of the inner cylinder 12
The inner cylinder 12 is screwed onto the inner circumferential surface of the outer cylinder 11 so as to be movable back and forth. In this case, the outer cylinder 11
The inner diameter from the middle to the front (to the left in the figure) is designed to be slightly smaller than the inner diameter of the threaded portion 15, and the outer diameter from the middle to the front of the inner cylinder 12 is designed to be slightly smaller than the outer diameter of the threaded portion 17. The inner circumferential surface of the outer cylinder 11 and the outer circumferential surface of the inner cylinder 12 in this portion are precisely rubbed together. Further, the inner circumferential surface of the front end of the inner cylinder 12 is formed in a tapered shape so that the difference in level from the inner circumferential surface of the outer cylinder 11 is small, and is designed so that the molten resin flows smoothly.

A flange portion 19 is formed at the rear end of the cylindrical portion 18 of the cylindrical land member work 3 . Further, the inner circumferential surface of the front end of the cylindrical portion 18 is formed into a tapered shape, and is designed to allow the molten resin to flow smoothly. The outer circumferential surface of the cylindrical portion 18 of the land member I3 is fitted onto the inner circumferential surface of the rear end portion of the inner cylinder 12 so as to be rubbed together. Furthermore, the flange 19 at the rear end of the land member 13 is fitted flush with an annular step formed on the rear end surface of the outer cylinder 11.

The above-mentioned land member 13 is a land of the inner cylinder (L2 in FIG.
), and to eliminate the level difference between the rear end of the outer cylinder 11 and the rear end of the inner cylinder 12 to smooth the flow of the molten resin. Note that the flange 19 of this land member 13 is not fitted flush with the annular step on the rear end surface of the outer cylinder 11, but rather on the rear end surface of the outer cylinder 11 where the annular step is not formed. They may be provided so as to be in close contact with each other.

The flow rate adjustment device 10 configured in this manner is provided between a thermoplastic resin extruder and an extrusion mold. Then, insert a suitable rod-shaped tool from the notch hole 14 of the outer cylinder 11 into the recess of the inner cylinder 12, and rotate the inner cylinder I2 clockwise (in the direction of the arrow in Fig. 2).
When the inner cylinder 12 is moved forward by twisting it, the land of the outer cylinder 11 (glue in FIG. 1) becomes shorter, and the land of the inner cylinder 12 (Lz in FIG. 1) becomes longer. the result,
The flow rate of molten resin in the cylinder decreases. Furthermore, if the inner cylinder 12 is moved backward by twisting it counterclockwise (in the direction opposite to the direction of the arrow in FIG. 2), the flow rate of the molten resin will increase. In this way, the flow rate of the resin is regulated.

The extrusion die flow rate adjusting device of the present invention is configured as described above.

FIG. 3 is a partially cutaway sectional view showing an example of the apparatus for simultaneously extruding multiple molded products of the present invention. In this figure, 20 is a thermoplastic resin extruder, 30 is one extrusion mold, 31 is the other extrusion mold, and 40 is provided to attach the two extrusion molds 30 and 31 to the extruder 20. Diversion adapter, 1
0 is the aforementioned flow rate adjustment device 10 (shown schematically). These devices and devices are attached by fixing means (not shown in the drawings) such as bolts and nuts using flanges, for example.

One extrusion die 30 is a pipe-forming extrusion die that is smaller in size than the other extrusion die 31. in this case,
If two small-sized pipes are extruded without providing the flow rate adjustment device 10, the extrusion speeds of the pipes from the two extrusion molds 30 and 31 will be different, and the pipes cannot be taken out by the same taking-off device, for example. Therefore, as shown in FIG.
A co-extrusion device for multiple molded products of the present invention is used, which is installed between the Then, as described above, the flow rate adjusting device 1 is
When the flow rate of the molten resin is adjusted to a desired value by 0 and extruded, the extrusion speed of the two pipes is adjusted to the same speed, and two thermoplastic resin pipes of different sizes are smoothly manufactured.

Although Fig. 3 shows the case where two thermoplastic resin pipes of different sizes are simultaneously extruded using one extrusion device, it is also possible to simultaneously extrude multiple molded products of irregular shapes such as sheets or channels. The extrusion apparatus may be configured as follows.The apparatus for simultaneously extruding multiple molded products of the present invention is configured as described above.

(Effects of the Invention) As described above, according to the extrusion die flow rate adjustment device of the present invention, the flow rate of molten resin can be easily adjusted by the simple operation of twisting the inner cylinder, which is superior to conventional devices. The device is simpler than the previous one.

In addition, unlike conventional devices, parts such as a flow rate adjustment plunger do not protrude into the resin flow path, so it is possible to use resins that easily decompose, such as vinyl chloride resin, resins with poor fluidity, or additives that easily decompose into the resin. Even when additives are blended, the flow rate of the resin can be well adjusted without decomposing the resin or additives or causing fluctuations in extrusion.

Furthermore, according to the simultaneous extrusion apparatus for multiple molded products of the present invention,
As mentioned above, since the flow rate of the molten resin can be easily and well adjusted, multiple thermoplastic resin molded products of different shapes and sizes can be extruded simultaneously and efficiently using a single extrusion device, which is economical. be.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of a flow rate adjusting device for an extrusion die according to the present invention, and FIG. 2 is an exploded view of the device shown in FIG. 1. FIG. 3 is a partially cutaway sectional view showing an example of the apparatus for simultaneously extruding multiple molded products of the present invention. 10...Flow rate adjustment device, 11...Outer cylinder, 12...
Inner cylinder, 13... Cylindrical land member, 14... Notch hole in outer cylinder, 15... Threaded part in outer cylinder, 16... Recessed part in inner cylinder, 17... Screw in inner cylinder Department.

Claims (1)

[Claims] 1. An extrusion die flow rate adjustment device provided between a thermoplastic resin extruder and an extrusion die, which flow rate adjustment device includes an outer tube and an inner periphery of the outer tube. It consists of an inner cylinder that is screwed onto the surface so that it can move back and forth and has a land length shorter than the land length of the outer cylinder, and a cylindrical land member that is fitted into the rear end of the inner peripheral surface of this inner cylinder. A notch hole is formed in the cylinder, and a recess is formed in the threaded surface of the inner cylinder at a position corresponding to the notch hole in the outer cylinder.A rod-shaped tool is inserted from the notch hole in the outer cylinder into the recess in the inner cylinder. A flow rate adjustment device for an extrusion mold, characterized in that the inner cylinder is moved back and forth by twisting the cylinder, thereby adjusting the flow rate of resin. 2. A simultaneous extrusion device for multiple molded products, in which a plurality of extrusion molds are attached to a thermoplastic resin extruder, the flow rate adjustment device according to claim 1 between the extruder and at least one extrusion mold. A simultaneous extrusion device for multiple molded products, characterized in that it is provided with.