JPH0580733U - Screw for extruder - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a screw for an extruder, and is particularly characterized by stable operation without a galling phenomenon between a screw and a cylinder even when a raw material such as a hard polymer is used. [Structure] The extruder screw according to the present invention has a flight part.
It has a guide groove (10) or recess (11) provided in (3), and guides the raw material (5) by this guide groove (10) or recess (11), and the cylinder (2) and screw (1) This is a structure for preventing the galling phenomenon.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw for an extruder, and more particularly to a new improvement for stable operation of a raw material such as a hard polymer without causing a galling phenomenon of the screw and the cylinder.

[0002]

[Prior Art]

 As a screw for an extruder of this type which has been conventionally used, the configuration shown in FIG. 3 is generally adopted. That is, the reference numeral 1 in FIG. 3 is a screw that is rotatably provided in the cylinder 2 and has a flight portion 3. A screw is provided between the peripheral surface 3 a of the flight portion 3 and the inner wall 2 a of the cylinder 2. D is formed. Therefore, the solid raw material 5 such as a polymer is changed from the solid phase to the liquid phase by the screw 1 and extruded.

[0003]

[Problems to be solved by the device]

 Since the conventional screw is configured as described above, there are the following problems. That is, in this extruder, when the polymer is changed from the solid phase to the liquid phase, a large amount of energy is consumed between the screw and the cylinder through the polymer. The energy consumed at this time changes into a force that pushes the screw non-uniformly against the cylinder, and since these extruders are cantilever extruders, a phenomenon occurs in which the screw comes into contact with the flexible cylinder. The harder the polymer, the greater the force, and this causes the polymer to break between the flight part of the screw and the cylinder. It was In addition, the clearance between the flight surface and the cylinder is very narrow, about 0.5 to 2 mm in the cylinder inner diameter of 65 to 305 mm class, so hard (high viscosity) polymers are less likely to enter this gap. Lubricity due to the polymer was lost, and galling of the screw and cylinder occurred frequently.

The present invention has been made in order to solve the above problems, and in particular, enables stable operation of a raw material such as a solid polymer without the galling phenomenon of a screw and a cylinder. It is intended to provide a screw for an extruder.

[0005]

[Means for Solving the Problems]

 An extruder screw according to the present invention is an extruder screw having a rotatably mounted flyt portion in a cylinder. The flight portion is provided with a guide groove, and a raw material is guided through the guide groove. It is a composition.

More specifically, the guide grooves are formed along the flow direction of the raw material, and a plurality of the guide grooves are arranged on the peripheral surface of the flight portion at the same intervals. It is a composition.

The extruder screw according to the present invention is a screw for an extruder, which is rotatably provided in a cylinder and has a flight portion. In the flight screw, a recess is provided in the flight portion, and the raw material is fed through the recess. Is a configuration for guiding.

[0008]

[Action]

 In the extruder screw according to the present invention, since the guide groove is provided in the flight part of the screw, the raw material such as hard polymer enters the gap between the peripheral surface of the flight part and the inner wall of the cylinder along the guide groove. It becomes easier and the lubricity of this polymer is maintained, and the galling phenomenon can be avoided. In addition, since the flight part of the screw has a concave portion, the polymer that has entered the concave portion is hard to come out, so that the above-mentioned lubricity is maintained and the galling phenomenon can be avoided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the screw for an extruder according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent portions as those of the conventional example will be described by attaching the same reference numerals. 1 and 2 show a screw for an extruder according to the present invention. FIG. 1 is a sectional view showing a configuration and FIG. 2 is a sectional view showing another embodiment.

First, what is denoted by reference numeral 1 in FIG. 1 is a screw that is rotatably provided in a cylinder 2 and has a flight portion 3. Between the peripheral surface 3 a of the flight portion 3 and the inner wall 2 a of the cylinder 2. A gap D is formed in the gap.

Further, on the peripheral surface 3a of the flight portion 3, a plurality of guide grooves 10 are arranged at the same intervals in the peripheral direction on the peripheral surface 3a along the flow direction of the solid raw material 5 such as polymer. Has been done. The shape of the flight part 3 is not limited to the full flight type, but may be any shape of a rotor or a kneading type.

Further, in the configuration of FIG. 2, a plurality of recesses 11 are formed on the peripheral surface 3 a, and the raw material 5 is locked in the recesses 11.

Next, the operation of the extruder screw according to the present invention having the above-mentioned configuration will be described. First, in the structure shown in FIG. 1, when a solid raw material 5 such as a polymer is fed by the screw 1, the raw material 5 is guided along each guide groove 10 and the space between the circumferential surface 3a of the flight part 3 and the inner wall 2a of the cylinder 2 is guided. It becomes easier to enter the clearance D and the lubricity due to the polymer is maintained, so that the galling phenomenon between the cylinder 2 and the flight portion 3 can be avoided, and safe driving can be performed.

In addition, in the configuration of FIG. 2, when a solid raw material 5 such as a polymer is fed by the screw 1, the raw material 5 enters and is locked in each recess 11 and is difficult to come out. 5 has a lubricating effect, and the screw 1 operates safely.

[0015]

[Effect of the device]

 Since the extruder screw according to the present invention is configured as described above, the following effects can be obtained. That is, the guide groove formed in the flight portion can guide the raw material such as polymer between the screw and the cylinder, and can prevent the galling phenomenon between the screw and the cylinder to continue the safe operation. Further, since the recess is formed in the flight portion, the raw material can be locked in the recess, and the galling phenomenon between the cylinder and the screw can be prevented by the raw material.

[Brief description of drawings]

FIG. 1 is a sectional view showing a screw for an extruder according to the present invention.

FIG. 2 is a sectional view showing another embodiment of FIG.

FIG. 3 is a cross-sectional configuration diagram showing a conventional extruder screw.

[Explanation of symbols]

 2 Cylinder 3 Flight part 3a Circumferential surface 5 Raw material 10 Guide groove 11 Recess

Claims (3)

[Scope of utility model registration request] 1. A screw for an extruder having a flight part (3) rotatably provided in a cylinder (2), wherein a guide groove (10) is provided in the flight part (3).
A screw for an extruder, characterized in that the raw material (5) is guided through the (10). 2. The guide groove (10) is formed along the flow direction of the raw material (5), and each guide groove (10) is on the peripheral surface (3a) of the flight part (3). 2. The extruder screw according to claim 1, wherein a plurality of the screws are arranged at the same intervals. 3. A screw for an extruder having a flight part (3) rotatably provided in a cylinder (2), wherein the flight part (3) is provided with a recess (11), and the recess (11) is provided.
A screw for an extruder, characterized in that the raw material (5) is guided through the screw.