JPH0584781A - Plasticizing device - Google Patents

Abstract

PURPOSE:To prevent the cutting of reinforcing fibers even when reinforcing fiber-containing pellets are plasticized in a device plasticizing staple fiber dispersed reinforced plastic. CONSTITUTION:In a plasticizing device of the injection or extrusion molding of plastic, plate-shaped or rod-shaped solid plastic is fed by the feed roller 5 separately provided in the gap where an ultrasonic oscillation horn 2 and an anvil 3 or ultrasonic oscillation horns 2,2' are exactly opposed to each other to be plasticized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasticizing device for injection molding, extrusion molding and the like of thermoplastic resins.

[0002]

2. Description of the Related Art An example of a conventional plasticizer for plastics is shown in FIG. In FIG. 4, 21 is a cylinder, 22 is a raw material hopper attached to the cylinder 21, 23 is a screw,
Reference numeral 24 is a speed reducer, 25 is a screw drive motor, 26 is a base for fixing the cylinder 21, the speed reducer 24, and the drive motor 25, and 27 is a heater installed on the outer peripheral portion of the cylinder 21. The operation will be described with reference to FIG. 4. When pelletized plastic is put into the raw material hopper 22 while the screw 23 is rotated by the drive motor 25 via the speed reducer 24, the plastic pellets are introduced into the cylinder, and the screw is screwed. 23 moves to the front of the cylinder 21. At this time, the plastic pellet is screw 2
3 is compressed by the cylinder 21 and receives a shear stress to generate heat by itself, and is plasticized and melted by heat transfer from the cylinder heated by the heater 27.

[0003]

The conventional plasticizing device is
It was plasticized and melted by the heat generated by shearing. However, in the short fiber dispersion reinforced plastic, when the pellets containing the reinforcing fibers are plasticized, the fibers tend to be cut.
An example of the measured data is shown in FIG.
The fiber length is about 0.9 mm. On the other hand, short fiber dispersion reinforced plastics exert a strengthening effect because the fibers share the stress applied to the plastics, but when the fibers become short, the bond between the fibers and the plastic becomes insufficient and they fall out. , The strengthening effect is significantly impaired. Therefore, it has been conventionally demanded to provide a plasticizing device capable of preventing the cutting of fibers as much as possible. The present invention has been proposed to solve the above conventional problems.

[0004]

Therefore, the present invention provides a plasticizing apparatus for injection molding and extrusion molding of plastics.
In order to solve the problem, a plate-shaped or rod-shaped solid plastic is fed and plasticized by a feed roller provided separately in the gap where the ultrasonic oscillation horn and the anvil are made to face each other. Is the means of. The present invention also provides
In a plasticizer for plastic injection molding and extrusion molding, a plate-shaped or rod-shaped solid plastic is fed and plasticized by a feed roller provided separately in the gap where the ultrasonic oscillation horn is directly opposed. And this is the means for solving the problems. Further, according to the present invention, in a plasticizing apparatus for injection molding or extrusion molding of plastic, a plate-shaped or rod-shaped solid plastic is fed by a feeding roller separately provided in a gap where an ultrasonic oscillating horn and an anvil are directly opposed. The plasticized resin is continuously supplied to the resin transport screw, the resin temperature is made uniform in the resin transport screw, and the pressure is increased. Is the means of.

[0005]

The plate-shaped or rod-shaped solid plastic fed into the gap between the ultrasonic oscillating horn and the anvil comes into contact with the ultrasonic oscillating horn and is plasticized and melted by frictional heat. However, in this case, since a large shearing force is not generated, the fiber can be prevented from being cut. Further, when the ultrasonic oscillating horn is directly opposed, the plasticizing and melting are promoted from both sides of the gap, and the plasticizing ability is further improved. Further, the molten resin plasticized by the ultrasonic oscillating horn makes it possible to make the resin temperature uniform in the resin transportation screw and to supply the molten resin by increasing the pressure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments of the drawings. FIG. 1 shows a first embodiment of the present invention. 1 in FIG.
Is an ultrasonic oscillator, 2 is a horn, 3 is an anvil, 4 is a cylinder, 5 is a feed roller, 6 is a feed roller drive motor, 7
Is a heater for a cylinder, 8 is a plate-shaped or rod-shaped plastic, 9 is a plate-shaped or rod-shaped plastic reel, and 10 is a base for supporting each of these elements. The plate-shaped or rod-shaped plastic 8 is fed from the reel 9 to the gap between the horn 2 and the anvil 3 via the feed roller 5 driven by the drive motor 6, and the ultrasonic oscillator 1 vibrates the horn 2. As a result, frictional heat is generated between the plate-shaped or rod-shaped plastic 8 and the plastic 8 is plasticized and melted.

Next, FIG. 2 shows a second embodiment of the present invention. The difference from the first embodiment of FIG. 1 is that instead of the anvil 3 of FIG. A horn 2'which vibrates by 1'is provided, the horns 2 and 2'are made to face each other, and a plate-shaped or rod-shaped solid plastic is provided by a feeding roller 5 in a tapered gap in which the feeding side between them is enlarged. 8 is sent. In the second embodiment, the plasticization of the solid plastic 8 is promoted from both sides, so that the plasticizing ability is further improved.

Next, FIG. 3 shows a third embodiment of the present invention, which is the same as the first embodiment of FIG. 1 in that a plate-shaped or rod-shaped solid resin 8 is fed into the gap between the horn 2 and the anvil 3. However, the plasticized molten resin in the gap between the horn 2 and the anvil 3 is fed into the adapter 19 surrounded by the heaters 18, 18 provided in place of the cylinder 4 having the heater 7 of FIG. Further, the resin is supplied into a cylinder 20 having a screw 11 driven by a drive motor 12, and further through an opening / closing valve 13, an accumulator 14, and an operation of an air cylinder 15 through an opening / closing valve 13 'to an injection nozzle 16 It is designed to be injected into the mold 17 from.

The operation of the embodiment shown in FIG. 3 will be described. The plate-shaped or rod-shaped plastic 8 is fed to the gap between the horn 2 and the anvil 3 by the feeding roller 5, and the ultrasonic oscillator 1 vibrates the horn 2. By doing so, frictional heat is generated between the plastic 8 and the plastic 8
Is plasticized and melted. The plasticized and melted plastic passes through the adapter 19 and is supplied to the resin transport screw 11 in the cylinder 20 driven by the drive motor 12. In the cylinder 20 having the resin transport screw 11, the temperature of the resin is made uniform and the pressure is increased and the resin is transported to the accumulator 14. After the required molten resin is flown into the accumulator 14, the molten resin is injected into the mold 17 through the injection nozzle 16 by the air cylinder 15 to obtain a molded product. It is also possible to remove the injection portions 13 to 17 and continuously perform extrusion molding. As described above, also in the embodiment of FIG. 3, the ultrasonic plasticizing device
Since a large shearing force is not generated during plasticization, the fibers are prevented from being cut, and a plastic molded product having high strength can be obtained by injection molding or extrusion molding of this plasticized plastic.

[0010]

As described in detail above, according to the present invention, the ultrasonic oscillation horn and the anvil are made to face each other, or the plate-like or rod-like shape fed into the gap formed by directly facing the ultrasonic oscillation horn. The solid plastic of (1) plasticizes and melts due to frictional heat generated between the solid plastic and the solid plastic due to vibration of the horn. Moreover, since a large shearing force is not generated in the plasticized and melted plastic, the fiber is prevented from being cut, and when the plasticized and melted plastic is injection-molded or extrusion-molded, a high-strength plastic molded product can be obtained. ..

[Brief description of drawings]

FIG. 1 is a front sectional view of an ultrasonic plasticizing apparatus according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of an ultrasonic plasticizing device according to a second embodiment of the present invention.

FIG. 3 is a front sectional view of an ultrasonic plasticizing device according to a third embodiment of the present invention.

FIG. 4 is a front sectional view showing an example of a conventional plasticizing device.

FIG. 5 is an explanatory diagram showing a conventional fiber cutting situation during plasticization by injection molding.

[Explanation of symbols]

 1,1 'Ultrasonic oscillator 2,2' Horn 3 Anvil 4 Cylinder 5 Feed roller 6 Feed roller drive motor 7 Heating heater 8 Plate or rod-shaped plastic 9 Reel 11 Resin transport screw 12 Drive motor 14 Accumulator 15 Air cylinder 16 Injection nozzle 17 mold

Claims (3)

[Claims] 1. In a plasticizing apparatus for injection molding and extrusion molding of plastic, a plate-shaped or rod-shaped solid plastic is fed by a feed roller separately provided in a gap where an ultrasonic horn and an anvil are made to face each other. A plasticizing device which is characterized by performing plasticization. 2. In a plasticizing apparatus for injection molding and extrusion molding of plastic, a plate-shaped or rod-shaped solid plastic is fed and plasticized by a feed roller separately provided in a gap facing an ultrasonic horn. A plasticizing device characterized by being plasticized. 3. A plasticizing device for plastic injection molding and extrusion molding, wherein a plate-shaped or rod-shaped solid plastic is fed by a feed roller provided separately into a gap where an ultrasonic oscillating horn and an anvil are made to face each other. The plasticizing device is characterized in that the plasticizing resin is continuously supplied to the resin transporting screw, the temperature of the resin is made uniform in the resin transporting screw, and the pressure is increased.