JPH065849Y2 - Rotating screw for kneading - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention This invention is provided with a kneading recess for enhancing kneading ability in the middle of a rotary screw, and synthetic resin such as ABS resin, glass fiber or carbon fiber, etc. The present invention relates to a kneading rotary screw used in an extruder for kneading and extruding.

(B) Background of the Invention In the rotary screw used in the extruder of the above-mentioned example, in order to enhance the kneading action, for example, a spiral groove is engraved on the outer peripheral surface of the rotary screw, and the outer peripheral surface of the groove bottom is further increased. A large number of recesses are engraved along the spiral direction to give a high kneading effect to the raw material.

However, the shape of the above-mentioned groove is usually engraved with the same width with respect to the peripheral surface of the rotating screw, so that although the groove bottom has a large number of recesses, it is blocked by the groove wall and the raw material is With respect to the flow in the spiral direction to be transferred, a large flow change, that is, a large change over the groove in the spiral width direction cannot be given, and a higher kneading action cannot be obtained. Since the recess is engraved on the outer peripheral surface of the groove so as not to destroy the groove engraved on the car, not only is the engraving work troublesome, but there is no technical difficulty due to the complicated shape of the kneading part. However, there is a problem that the manufacturing cost becomes high.

(C) Purpose of the invention The invention is to engrave a large number of wide kneading recesses and narrow kneading recesses in the virtual spiral direction on the outer peripheral surface of the rotary screw, and to connect them to each other by a flow passage. An object of the present invention is to provide a kneading rotary screw capable of uniformly kneading a raw material in a predetermined molten state by a kneading section during transfer to obtain a high kneading effect.

(D) Configuration of the device This device is provided on the outer peripheral surface of the rotary screw at a predetermined kneading position.
A large number of wide kneading recesses and narrow kneading recesses are staggered along the virtual spiral direction, and the wide kneading recesses adjacent to each other in the spiral width direction and a part of the narrow kneading recess are polymerized to form a flow passage. It is characterized in that it is a kneading circuit screw in which is engraved.

(E) Action of the device This device is designed to allow the raw material transferred by the rotating action of the rotary screw to flow into and out of the wide kneading concave part and the narrow kneading concave part engraved on the way of transfer, and to enclose the flow passage in the polymerization part. A turbulent flow phenomenon due to a pressure change when flowing from the wide kneading concave portion to the narrow kneading concave portion,
A turbulent pulsation phenomenon occurs in the kneading part due to the pulsation phenomenon due to the flow resistance when flowing from the wide part to the narrow part, and the wide kneading concave part and the narrow kneading part engraved in a zigzag pattern in the virtual spiral direction are formed. The recesses are forced to flow alternately to give a staggered flow change to the raw material, and the raw material is positively stirred and homogeneously kneaded.

(F) Effect of the device According to this device, the raw materials can be positively stirred and homogeneously kneaded when passing through the kneading section. For example, in the case of kneading a semi-molten raw material or a complete melting. When kneading the raw materials in the state, a positive stirring and kneading action suitable for the molten state is obtained, and the kneading raw material to be extruded has a uniform quality.

Moreover, it is not necessary to engrave a complicated kneading structure in which a concave portion is engraved on the outer peripheral surface of the groove unlike the conventional case, and a simple kneading structure in which only a kneading concave portion is engraved on the outer peripheral surface of the rotary screw is provided. Since the positive stirring and kneading action suitable for kneading can be obtained, the production is facilitated and the cost can be surely reduced.

(G) Embodiment of the Invention One embodiment of the invention will be described in detail below with reference to the drawings.

The drawing shows a kneading rotary screw for an extruder for kneading and extruding a powdery ABS resin (acrylonitrile-butadiene-styrene resin) and glass fiber. In FIG. 1, the extruder 1 is A heating cylinder 4 having a charging port 2 for charging a raw material into and an extruding port 3 at the other end.
The raw material charged in the heating cylinder 4 is
It is configured by inserting a rotary screw 5 that feeds pressure from the input port 2 to the extrusion port 3.

As shown in FIG. 1, the above-mentioned heating cylinder 4 is provided with a first vent hole 6 for deaeration and a second vent hole 7, and a band heater 8 is attached to the outer peripheral surface thereof.

Further, a hopper 9 for feeding a raw material is provided on the feeding port 2 so as to communicate with the feeding port 2. The raw material of the powdery substance loaded in the hopper 9 flows down in a fixed amount and is heated. It flows into the cylinder 4.

The above-mentioned rotary screw 5 is provided with a second screw as shown in FIG.
A large number of wide kneading recesses 10 and narrow kneading recesses 11 are engraved along the spiral direction on the outer peripheral surface of the inlet 2 side near the vent hole 7 to form a kneading part 12 for kneading the raw materials.

The wide kneading concave portion 10 is engraved along the spiral direction on the outer peripheral surface of the kneading portion 12 formed to have the maximum outer diameter of the rotary screw 5, and the engraved state is as shown in FIG. In addition, it is engraved on the outer peripheral surface of the rotary screw 5 toward the center of the shaft with a wide arc surface set to be larger than the radius of curvature of the maximum outer diameter dimension of the rotary screw 5.

That is, the above-described wide kneading recess 10 is deepest carved in the central part in the spiral direction, and is gradually shallowed away from the central part in the spiral direction in the spiral direction to form a smooth recess in the spiral direction. is doing.

The narrow kneading recesses 11 described above are formed by zigzag the narrow kneading recesses 11, 11 having a semicircular cross section and a rectangular cross-section in zigzag directions at both sides of the wide kneading recess 10 described above.
The narrow circular arc surface having the same curved surface as the wide circular arc surface described above is engraved toward the center of the shaft.

Furthermore, in the spiral width direction of the wide kneading concave portions 10 engraved in a zigzag pattern and the narrow kneading concave portions 11 on both sides,
Adjacent side edge portions are overlapped with each other, and the flow passage 13 is formed by using the overlapped portion as a flow permitting portion in the spiral width direction.

With the extruder 1 configured as described above, for example, ABS in powder form
When the raw materials of resin and glass fiber are kneaded and extrusion-molded, as shown in FIG. 1, when the mixed raw materials are put into the hopper 9, they are transferred by the rotary screw 5 rotating in the direction of the arrow, and the hopper is rotated. The raw material in 9 is transferred in the direction of the extrusion port 3 while continuously flowing in a fixed amount into the heating cylinder 4.

Then, while the raw material was transferred to the extrusion port 3 side, the raw material was heated by the band heater 8 and was degassed in the first vent hole 6 while being melted, and then provided on the rear side of the rotary screw 5. When passing through the kneading section 12, the raw material is transferred into and out of the wide kneading concave portion 10 and the narrow kneading concave portion 11 to cause a turbulent arterial phenomenon, and at the same time, the raw material is wide kneading concave portion 10 and narrow widths at both sides. The kneading recess 11 and the flow passage 13,
After flowing through 13 and splitting from the wide kneading concave portion 10 into the narrow kneading concave portions 11, 11 on both sides, the flow flows into the wide kneading concave portion 10 again to join, and with respect to each virtual spiral direction, The wide kneading concave portions 10 and the narrow kneading concave portions 11 engraved in a zigzag pattern are alternately and forcibly flowed, and the kneading action of repeatedly imparting a staggered flow change to the raw material and stirring the mixture is positively and efficiently performed. After being homogeneously kneaded and deaerated in the second vent hole 7, they are sequentially extruded from the extrusion port 3 while being kneaded.

Thus, the wide kneading recess 1 is formed on the outer peripheral surface of the rotary screw 5.
0 and the turbulent pulsation that occurs when passing through the narrow kneading recess 11 and the staggered flow change that forces the wide kneading recess 10 and the narrow kneading recess 11 to stir the raw material positively. Can be uniformly kneaded, and the kneading section 12
Since it is possible to obtain a high stirring and kneading action while engraving is simple, the manufacturing becomes easy and the cost can be reduced.

Further, the raw material is heated and kneaded without waste while receiving a stable transfer action by the rotary screw 5 in the heating cylinder 4, and the kneaded raw material that is guided to the extrusion port 3 side and extruded has a uniform quality.

It should be noted that the wide kneading concave portion 1 engraved on the rotary screw 5 described above.
0 may be set to the length and the number of threads according to the degree of kneading of the powdery raw material to be kneaded, and the present invention is not limited to the configuration of the above-described embodiment.

[Brief description of drawings]

 The drawing shows one embodiment of the present invention. Fig. 1 is a vertical sectional side view of an extruder, Fig. 2 is an enlarged side view of a main part of a rotary screw, and Fig. 3 is an enlarged sectional view taken along line II-II of Fig. 2. It is a figure. 1 ... Extruder, 4 ... Heating cylinder, 5 ... Rotating screw, 10 ... Wide kneading recess, 11 ... Narrow kneading recess, 13 ... Flow passage

Claims (1)

[Scope of utility model registration request] 1. An outer peripheral surface of a rotary screw at a predetermined kneading position,
A large number of wide kneading recesses and narrow kneading recesses are formed in a zigzag pattern along the virtual spiral direction, and the wide kneading recesses adjacent to each other in the spiral width direction and a part of the narrow kneading recesses are polymerized to form a flow passage. A rotary screw for kneading that is engraved with.