JPS6343066Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of the invention This invention relates to an extruder that performs extrusion molding of a thermoplastic resin or the like in a heated and softened state.

(b) Background of the Invention In conventional extruders, when a movable die gate is attached to a fixed flange on the discharge side of a heating cylinder, the die gate is attached so that both sides of the die gate are in contact with the fixed flange.

In this surface contact, it is difficult to bring the entire surface into complete contact, and extremely small gaps occur locally.

Therefore, there is a problem in that the resin that flows out from the gap between the heating cylinder and the strand due to the pressure during extrusion molding flows out through the local gap between the fixed flange and the die gate.

(c) Purpose of the invention The object of this invention is to provide an extruder in which a fixed flange and a die gate are attached through circular line contact to prevent resin from flowing out from this part.

(d) Summary of the invention This invention is an extrusion method in which a fixed flange and a movable die gate are formed with opposing stepped portions on the circumference of their opposing surfaces, and the two are in circular line contact at this stepped portion. It is characterized by being a machine.

(e) Effects of the invention According to this invention, opposing step portions are formed on the circumference of the facing surfaces of the fixed flange and the movable die gate, so that the circular line contact means between the two is simple and easy. Therefore, reliable circular line contact means can be easily obtained, thereby preventing resin from flowing out from between the fixed flange and the die gate.

(f) Example of the invention An example of the invention will be described below in detail based on the drawings.

The drawing shows an extruder, and in FIG. 1, 1 is a heating cylinder, inside of which is a rotating screw 2 for conveying resin, and on one side is a resin inlet (not shown). A strand 4 is provided inside the fixed flange 3 provided on the other side, which is the discharge side.
is fixed, and a movable die gate 5 is attached to the fixed flange 3.

Opposing step portions 3a and 5 are provided on the circumference of the facing surfaces of the fixed flange 3 and the movable die gate 5.
Provide a.

When the die gate 5 is joined to the fixed flange 3, the angles of inclination of the stepped portions 3a and 5a may be made different as shown in FIG. 2, or by various means described later. It was configured like this.

3 and 4 show means for movably attaching the die gate 5 to the fixed flange 3, in which one part of the die gate 5 is placed between the L-shaped protrusions 6, 6 protruding from one side of the fixed flange 3. The protruding part 7 protruding from the side is fitted, and the pin 8 is inserted into the hole provided in both the protruding parts 6, 7, so that the die gate 5 can be rotated in the horizontal direction with respect to the flange 3.

Furthermore, a shaft 10 is pivotally supported in recesses 9 provided at four corners of the fixed flange 3, and a bolt 11 fitted in advance into this shaft 10 is made horizontally rotatable.

Horizontal recesses 12 are also provided at the four corners of the movable die gate 5 facing each recess 9 of the fixed flange 3, and after horizontally rotating and fitting the above-mentioned shaft 10 into these recesses 12, the shaft 10 is inserted into the recess 12. Nut 1 on the tip 13 of 10
4, the die gate 5 is fixed to the fixed flange 3, and the two are brought into close contact by the above-mentioned circular line contact.

In this way, on the circumference of the opposing surfaces of the fixed flange 3 and the movable die gate 5, opposing stepped portions 3a,
5a, the circular line contact means between the two can be made simple and easy, and a reliable circular line contact means can therefore be easily obtained, thereby ensuring that the fixed flange 3 and the die gate 5 are in close contact with each other. This prevents the resin from flowing out from between them.

(f) Other examples of the invention In the above embodiment, the stepped portion 5 of the die gate 5
A part of the step part 3a of the flange 3 is brought into contact with the inclined surface of the step part 3a of the flange 3, as shown in FIG.
It may be made to contact the inclined surface of the step portion 5a.

Furthermore, as shown in FIG. 6, the abutting stepped portion 3a may be a right-angled stepped portion 3b.

Further, as shown in FIG. 7, both the stepped portions may be formed into stepped portions 3c and 5c having arcuate circumferential surfaces.

Note that the stepped portion may be formed into a two-stage stepped portion 5d as shown in FIG.

The various stepped portions described above may be used in appropriate combinations.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and FIG. 1 is a partially vertical side view of the main part. Figure 2 is an enlarged view of a part of it.
Figure 3 is a front view. Figure 4 is a plan view. FIGS. 5 to 8 are explanatory diagrams showing other modifications. 1... Heating cylinder, 3... Fixed flange, 4
...Strand, 5...Movable die gate, 3
a, 5a... step section.

Claims (1)

[Scope of Claim for Utility Model Registration] In an extruder in which a strand is fixed inside a fixed flange on the discharge side of a heating cylinder, and a movable die gate is attached to the fixed flange, an opposing surface between the fixed flange and the movable die gate. 1. An extruder characterized in that opposing step portions are formed on the circumference of the extruder, and the two are in circular line contact at the step portion.