JP3509200B2 - Thermoplastic plasticizer - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a tree for the time of injection molding of thermoplastic resins perform melting and plasticizing the thermoplastic resin
The present invention relates to a fat plasticizer .

[0002]

2. Description of the Related Art Generally, in the case of injection molding of a thermoplastic resin, the thermoplastic resin is melted and fluidized by a plasticizing device and then injected into a mold in a pressurized state. . As such a molding machine, there is a plunger type molding machine. However, since the plunger type molding machine does not take into consideration the so-called shear force thinning property in which the viscosity of the thermoplastic resin decreases due to the shearing force. Although the apparatus has a simple structure, the thermoplastic resin is not sufficiently kneaded.

Therefore, there is a limit to the fluidity of the thermoplastic resin injected into the mold, and the shape of the mold cavity cannot be sufficiently transferred. Therefore, there is a problem in terms of accuracy of the molded product. It was Therefore, a screw-type molding machine has been developed in which the thermoplastic resin is kneaded by shearing with a screw.

The screw type molding machine includes an in-line screw type molding machine and a conical screw type molding machine. Among them, the in-line screw type molding machine is excellent in terms of plasticizing and kneading the thermoplastic resin, but since the plasticizing device is long and slender, the total length of the injection molding machine becomes long. In the case of a molding machine, the total height is large and installation is limited.

Further, in the case of molding with a high-viscosity resin,
Since high-pressure injection is required, a small screw is used, but it easily breaks depending on the operation.
Furthermore, when the thermoplastic resin is injected, the screw itself acts as a plunger, so the ring attached to the tip of the screw acts as a check valve at the time of injection, which makes the structure complicated, easily damaged, and easy to maintain. Is troublesome. Further, since the ring reciprocates for each shot due to the repetition of plasticization and injection, a motion delay of the ring at the time of injection occurs.

On the other hand, the conical screw type molding machine is equipped with a plasticizing device composed of a conical screw as shown in FIG. That is, in FIG. 6, the plasticizing device 1 includes a conical screw 2 having a truncated cone shape, a barrel 4 having an internal space in which the tip of the conical screw can be fitted so as to have a gap 3, and a tip of the barrel 4. And a resin injection nozzle 5 attached to the.

The conical screw 2 is provided with a spiral flight 2a on its conical outer peripheral surface and rotates about an inner cylinder 2b.

Here, the resin material of the thermoplastic resin delivered from the hopper (not shown) is melted through the groove between the flights from the hopper port 4a opened to the side of the barrel 4 while the nozzle 5 of the nozzle 5 is being melted. Sent in the direction. that time,
The molten resin material sent to the inner cylinder 2b through the gap 3 causes the plunger 6 provided in the inner cylinder 2b to retract to the measuring position (see the position shown in FIG. 6).

Next, prior to injection, the inner cylinder 2
b advances slightly and closes the gap 3,
Prevents backflow of resin material in the screw direction due to injection. Then, as the plunger 6 moves forward, the resin material in the inner cylinder 2b is injected through the nozzle 5 (see FIG. 7).

[0010]

In such a conical screw type molding machine, the passage of the resin material is constructed in a small size and advances along the groove between the flights 2a formed on the outer peripheral surface of the conical screw. Has an advantage in that fluidization is promoted by the resin material being compressed in the tip direction and being compressed. However, the flow velocity of the resin material decreases as it goes toward the tip of the conical screw. Further, since backflow prevention during injection is performed by advancing the inner cylinder, there is a problem that the structure becomes complicated because a drive source for the inner cylinder is required.

In view of the above points, an object of the present invention is to provide a plasticizing device for a thermoplastic resin , which has a simple and compact structure and is capable of sufficiently plasticizing and kneading.

[0012]

According to the present invention, the above object is to provide a thermoplastic resin injection molding machine having a spirally extending resin pellet intake groove formed on the upper surface and driven to rotate. A disk-shaped plasticizing disc, a heating plate disposed so as to contact the upper and lower surfaces of the plasticizing disc and heated and adjusted to a predetermined temperature, and resin pellets on the surface of the plasticizing disc A resin pellet supply unit fixedly arranged so as to face the innermost end of the intake groove, and a plastic pellet supply unit that is disposed so as to liquid-tightly surround the outer circumference of the plasticizing disk and extends downward on at least one inner surface. With a feed bush with a feed runner ,
The resin pellet intake groove runs from the inner side to the outer side.
Are continuously connected in a spiral shape and run from the inner circumference side to the outer circumference side.
The first groove and the first groove.
The bypass path and the second gang connected to this bypass path.
This is accomplished by a plasticizing device for the thermoplastic resin consisting of the lube .

[0013]

In the plasticizing device for thermoplastic resin according to the present invention, preferably, a plurality of resin pellet receiving grooves are formed on the upper surface of the plasticizing disk.

More preferably, the first groove contains unmelted resin pellets on the inner peripheral side of the plasticizing disk, and is guided to the bypass passage as the unmelted resin pellets are gradually melted. The molten resin that is further melted is guided to the second groove.

In the plasticizing apparatus for thermoplastic resin according to the present invention, feed runners provided on the inner surface of the feed bush are preferably provided at equal angular intervals.

The thermoplastic resin plasticizing apparatus according to the present invention is preferably arranged such that at the time of injection, the opening of the resin pellet intake groove of the plasticizing disk is displaced from the feed runner of the feed bush. Good.

[0018]

[0019]

According to the above construction, the plasticizing disc heated to a predetermined temperature is driven to rotate, thereby making one revolution with respect to the innermost end of the resin pellet taking-in groove formed on the upper surface of the plasticizing disc. Resin pellets are supplied for each. As a result, the resin pellets are melted by the temperature of the plasticizing disc and are pushed outward in the radial direction based on the centrifugal force generated by the rotation of the plasticizing disc.

Therefore, the molten resin flows out along this groove and reaches the outermost end of this groove while being kneaded. At that time, the molten resin flows over the groove and flows into the groove portion on the outer side, so that the resin is sheared and the viscosity is lowered. Thus, the molten resin will be plasticized to a state in which it can be injection-molded. In this way, the plasticized molten resin flows into the feed runner of the feed bush from the outermost end of this groove and is injected.

When a plurality of resin pellet intake grooves are formed on the upper surface of the plasticizing disk in a multi-chain line shape, the resin pellets are supplied to the grooves to gradually plasticize the resin pellets. It will be.

When the feed runners provided on the inner surface of the feed bush are provided at equal angular intervals, the molten resin will flow into each feed runner uniformly, resulting in a more uniform molten resin. Is plasticized.

At the time of injection, when the plasticized disk is stopped at the position where the opening of the resin pellet intake groove is displaced from the feed runner of the feed bush, in order to prevent the backflow of the molten resin at the time of injection, It is only necessary to stop the rotation of the plasticizing disc.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to FIGS. It should be noted that the examples described below are suitable specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows an example of a molding machine incorporating a thermoplastic resin plasticizing apparatus according to a preferred embodiment of the present invention. In FIG. 1, the molding machine 10 is configured as a robot-type injection molding module in a smaller size than a horizontal in-line screw molding machine. The molding machine 10
A low-pressure mold clamping device 13 attached to the frame 11 via a swing arm 12, and the low-pressure mold clamping device 13
A mold 14 placed on the frame 11 and a high-pressure mold clamping device 15 movably attached to the frame 11 in a lateral direction.
And an injection unit 16 attached to the frame 11 above the mold 14.

The low-pressure mold clamping device 13 includes the swing arm 1
From the retracted position A pulled out by the swing of 2,
It is movable to a mounting position B located below the injection unit 16. And this low pressure mold clamping device 13
In the retracted position A , the preassembled mold 14 is placed on the upper surface of the retracted position A, and is moved to the mounting position B by the swinging of the swinging arm 12.

As a result, the mold 14 is set at a predetermined position with respect to the injection unit 16. Here, the mold 14 is a mold for injection molding, and in the assembled state, a cavity having the shape of a molded product is defined inside and a gate communicating with the cavity from the outside is provided. There is.

The high-pressure mold clamping device 15 is configured such that the low-pressure mold clamping device 13 and the mold 14 located at the mounting position are connected to the injection unit 1.
With a pressure that can oppose the injection pressure of 6, it can be fixedly held from the side.

Here, the injection unit 16 is constructed as shown in FIG. That is, in FIG. 2, the injection unit 16 includes a substantially disc-shaped plasticizing disk 21.
And heating plates 22 and 23 which come into contact with the plasticizing disk 21 from above and below, and at least one of which is arranged at equal angular intervals in the circumferential direction with respect to the lower surface of the lower heating plate 23. In some cases, it includes a feed bush 24 arranged so as to define a feed runner 24a to serve as a passage for four resin materials.

The plasticizing disk 21 is rotatably supported with respect to the heating plate 23, and as shown in FIG. 3, a groove for taking up resin pellets formed in a spiral shape from the inside to the outside on the upper surface thereof. 41 are formed. further,
As shown in FIG. 2, this plasticizing disc 21
Has a drive gear portion 21b protruding upward from the upper surface thereof, and the drive gear portion 21b has a drive gear 25a attached to the drive shaft of the plasticizing disk motor 25.
Are connected via a gear train 26. This allows
The rotation of the plasticizing disk motor 25 causes the plasticizing disk 21 to rotate around the central axis.

The heating plates 22 and 23 and the feed bush 24 are respectively provided with heaters 22a, 23a,
It is heated by 24b and adjusted to a predetermined temperature. As a result, the plasticized disc 21 is kept at the predetermined temperature.

A nozzle 27 communicating with the internal space is provided at the lower end of the feed bush 24.

Further, as shown in FIG. 2, the injection unit 16 is provided with a hopper 29 for accommodating the previously dried resin pellets 28 above the plasticizing disc 21. The hopper 29 is provided with a supply portion 29a extending obliquely downward from the lower end thereof, and the tip of the supply portion 29a is opened to face the innermost end of the resin pellet intake groove 41 of the plasticizing disk 21. ing.

Further, the injection unit 16 is provided with a plunger 30 which is supported so as to be vertically movable along the centers of the plasticizing disk 21 and the heating plate 23. The plunger 30 is liquid-tightly fitted into bores 21c and 23b provided at the centers of the plasticizing disk 21 and the heating plate 23. Here, the plunger 30 is vertically moved and controlled by a reciprocating drive mechanism 31 using a ball screw 31 a provided above the heating plate 22.

The reciprocating drive mechanism 31 has a first flange 31b integrally attached to the plunger 30 and a second flange 31d connected via a rod 31c.
have. Then, the ball screw 3 is supported by the screw member 31e provided on the second flange 31d so that the upper end thereof does not move vertically with respect to the first fixed flange 31f.
1a is screwed. Furthermore, this ball screw 31a
Is driven to rotate by a plunger motor 32 via a gear train 33.

Below the fixed flange 31f, a second fixed flange 31h is provided via a rod 31g.
Are connected. Thereby, the second flange 3
The first flange 31b and the plunger 30 are guided along the central axis by sliding 1d along the rod 31g and sliding the second fixed flange 31h along the rod 31c.

FIGS. 3A and 3B show a preferred configuration example of the plasticizing disk 21. FIG. 3A is a plan view, FIG. 3B is an enlarged view of AA cross section, and FIG. 3C is B. It is an enlarged view of the -B cross section. In the figure, on the upper surface of the plasticizing disk 21, the groove 41 for taking in the resin is formed. The groove 41 is formed in a spiral shape from the inside to the outside. Specifically, the innermost groove, which is shown by a diagonally upward-sloping portion in the drawing, is the first groove 43. An area indicated by a dot on the outside of the drawing is the bypass passage 44. Further, a region indicated by a diagonal line rising to the left outside thereof is the second groove 45.

These first groove 43 and bypass passage 44
3 and FIG. 3 at the extension end side of the spiral shape.
They are connected as shown in (c). That is, the first groove 43, the bypass passage 44, and the bypass passage 44.
Part of the second groove 45 and the second groove 45 are connected to each other. The first grooves 43 are formed as deep grooves on the base end side (inner peripheral side) and shallower toward the outer side. Bypass path 44 and second groove 45 are opposite
The base end is shallow and the outside is deep.

That is, as a result of considering the melting degree and fluidity of the resin applied to the plasticizing disk 21, each groove is configured as follows. That is, the first groove 43 is the disc 2
It is formed so as to be deeper inwardly of 1 and shallower outwardly in a spiral shape, and communicate with the bypass passage 44 with this shallowed portion as a center. Overcoming bypass 44
The melting point is high enough to allow
Flow out into the second groove 45. Therefore, the second group
The groove 45 is deeper toward the outer circumference.

As shown in FIG. 3, a gas vent 34 having a vent hole 34a may be provided on the upper surface of the plasticizing disk 21.

The molding machine 10 according to the present embodiment is configured as described above, and with the low-pressure mold clamping device 13 pulled out to the retreat position A, the mold 14 is placed on the upper surface of the molding machine 10 and the low-pressure mold is pressed again. The mold clamping device 13 is moved to the mounting position B. Then, the resin material of the thermoplastic resin is injected into the mold 14 by the injection unit 16 while the low-pressure mold clamping device 13 and the mold 14 are laterally fixedly held by the high-pressure mold clamping device 15.

Then, after a predetermined cooling time has elapsed, the high-pressure mold clamping device 15 is retracted and the swing arm 12 is swung to move the low-pressure mold clamping device 13 to the retracted position A, and the mold 14 is moved. The mold is opened, and the molded product molded in the cavity of the mold 14 is taken out. Thus, injection molding is performed.

In this case, the injection molding by the injection unit 16 is performed as follows. That is, the plasticizing disk 21 is heated by the heating plates 22 and 23 and the feed bush 24, and its temperature is adjusted to a predetermined temperature. In this state, when the plasticizing disk 21 is rotationally driven by the motor 25, the plasticizing disk 21
Of, once per revolution, the groove 4 for resin pellets uptake
The innermost end 42 of No. 1 faces the opening of the supply unit 29 a of the hopper 29. Thus, the resin pellets uptake for the first groove 43 of the groove 41, unmelted resin pellets 28 of thermoplastic resin from a hopper 29 as shown in FIG. 3 (b) is taken as P1. This unmelted resin pellet P1 is the first groove 43 of the plasticizing disk 21.
It is melted by the heat of the plasticizing disk 21 inside.

In this process, when the plasticizing disk 21 is rotated at a high speed by the motor 25, the resin pellet P1
Flows in a spiral shape while increasing the degree of melting of the resin pellet intake groove 41 toward the outside, and the heating plate 2
The second and second grooves, which are the outermost portions of the resin pellet taking-in groove 41, pass through the bypass passage 44 while receiving a shearing force from 2, 23. 3 (a) and as shown (b), the unmelted resin pellets P1 flows into the bypass passage 44 as a resin P2 while increasing the melting degree. In this case, since the resin having a high degree of melting goes upward, the resin having a high fluidity moves to the groove on the outer side through the communicating portion between the bypass passage 44 and the second lube 45.

Therefore, as shown in FIGS. 3 ( a ) and 3 ( b ), the resin moved to the groove on the outer side of the disk 21 while increasing the flow rate while increasing the melting degree, and was almost completely melted. The resin P3 reaches the outermost end of the plasticizing disc 21 from the upper layer of the second groove, and the molten resin P3 is fed to the inner surface of the foot bush 24 by the feed runner 24.
It flows in a and flows into the space defined by the heating plate 23 and the tip of the plunger 30. Here, by rotating the ball screw 31a by the motor 32 and pulling up the plunger 30 to a predetermined position, an amount of molten resin corresponding to the amount of pulling up of the plunger 30 is sucked up into this space, and a fixed amount of molten resin is obtained. Will be weighed.

Subsequently, the motor 25 is appropriately driven and controlled so that the outermost end 21b of the resin pellet taking-in groove 41 of the plasticizing disk 21 faces a position displaced from the feed runner 24a of the feed bush 24. Then, the plasticizing disk 21 is stopped.

After that, the motor 30 is driven to lower the plunger 30. As a result, the molten resin sucked into the space defined by the heating plate 23 and the lower end of the plunger 30 is discharged from the nozzle 27 to the mold 1
It is injected into the gate of No. 4 and molded. At this time, since the feed runner 24a of the feed bush 24 does not face the resin pellet taking-in groove 41 of the plasticizing disk 21, backflow of the molten resin at the time of injection is prevented. Thus, one cycle of injection molding is completed. By repeating the above operation, injection molding is continuously performed.

In this case, the resin pellets 28 that have entered the resin pellet intake grooves 41 of the plasticizing disk 21 are melted by the heat of the plasticizing disk 21 to become molten resin. This molten resin will be extruded to the outer peripheral side based on the centrifugal force generated by the rotation of the plasticizing disk 21. At that time, as shown in FIG. 3, for example, the molten resin in the primary flow path 41-1 of the resin pellet intake groove 41 is
The heating plate 22 receives a shearing force to reduce the viscosity.

As a result, the molten resin overflows from the primary flow channel 41-1 into the secondary flow channel 41-2. Here, since the peripheral speed of each flow path of the resin pellet intake groove 41 is higher toward the outer peripheral side due to the rotation of the plasticizing disk 21, even if the flow path is relatively short, the viscosity is surely reduced due to shear heat generation. Will be obtained.

Furthermore, since the molten resin overflows from the primary flow path 41-1 into the secondary flow path 41-2 as described above, there is a so-called spiral barrier screw effect.
The kneading will be sufficiently performed.

Here, the melting and kneading of the resin pellets 28 by the plasticizing disk 21 in the above-described molding machine 10 utilizes, for example, the principle of a stone mill as shown in FIG. That is, as shown in FIG.
The soybean or the like 43 put between 1 and the rotating portion 42 is finely crushed by the rotation of the rotating portion 42 and is pushed out to the outer periphery. At this time, the fixed portion 41 and the rotating portion 4
Due to the presence of granular material such as soybean 43 between the two, the rotation resistance of the rotating portion 42 is reduced. Similarly, also in the molding machine 10 according to the present embodiment, when the resin pellet taking-in groove 41 is in close contact with the heating plate 22 or when the resin pellets 28 have a relatively low temperature and low fluidity, the plasticizing disk is used. The rotation resistance of 21 becomes large. Therefore, a substance that does not affect the physical properties of the resin pellets 28 may be sandwiched in advance between the resin pellet intake groove 41 or the plasticizing disk 21 and the heating plate 22.

As described above, in the above-described embodiment, the resin pellets supplied to the resin pellet intake groove of the plasticized disc by rotating the plasticized disc heated to the predetermined temperature are the resin pellets. Are melted by the temperature of the plasticizing disc and are extruded radially outward due to the centrifugal force generated by the rotation of the plasticizing disc.

As a result, the molten resin flows out along this groove, reaches the outermost end of this groove while being kneaded, and is also sheared by passing over this groove by the centrifugal force and flowing into the outer groove portion. , The viscosity is reduced. Thus, the molten resin will be plasticized to a state in which it can be injection-molded. Therefore, since the resin can be plasticized by the disk-shaped plasticizing disk, a relatively long screw as in the conventional case is not required, and the entire structure can be made compact. Further, the molten resin flowing in the grooves has a gradually increasing peripheral speed, so that the flow resistance is reduced, and more sufficient plasticization and kneading are performed. As a result, it is possible to plasticize an engineering plastic containing a filler, for example.

Furthermore, by driving each drive mechanism by an electric motor, a completely electric molding machine is constructed, which is easy to handle and the molding machine incorporating the plasticizing device according to the present invention is a robot. it is also possible to install in-line, also, it is also possible to install in the clean room. When a plurality of resin pellet intake grooves are formed on the upper surface of the plasticizing disc in a multi-chain line shape, the resin pellets are supplied to each groove to plasticize the resin pellets. Therefore, a relatively large amount of resin pellets are simultaneously plasticized.

When the feed runners provided on the inner surface of the feed bush are provided at equal angular intervals, the molten resin will flow into each feed runner uniformly, resulting in a more uniform molten resin. Is plasticized. At the time of injection, when the plasticizing disc is stopped at a position where the opening of the resin pellet intake groove is displaced from the feed runner of the feed bush, the plasticizing disc is plasticized to prevent backflow of the molten resin at the time of injection. All that is required is to stop spinning the disc. Therefore, in order to prevent the backflow of the molten resin at the time of injection, no other drive mechanism is required, which simplifies the configuration and reduces the cost.

Although the plasticizing disk 21 is used in place of the screw in the conventional screw-type molding machine in the above-described embodiment, the plasticizing disk 21 is not limited to this, and a disk having the same structure is used as the resin flow path. It is also possible to reduce the flow resistance of the molten resin by inserting it into a part of the hot runner. Further, in the above-described embodiment, the resin pellet taking-in groove 41 of the plasticizing disk 21 is used.
In the above, the plurality of grooves are formed so as to be one as a whole, but the plurality of grooves may be formed in parallel in a multiple spiral shape. Further, although four feed runners 24a of the feed bush 24 are provided on the inner surface of the feed bush 24 in the illustrated example, the number of feed runners 24a is not limited to this, and it is clear that one, three, five or more may be provided.

Further, in the above-mentioned embodiment, the built-in heaters 22a, 23a, 24b are used as the heat sources of the heating plates 22, 23 and the feed bush 24, but the present invention is not limited to this, and other heat sources, For example, a heat source using magnetic force, ultrasonic waves or high frequency may be used.

Further, although the motors 25 and 32 are used as a driving device for rotating the plasticizing disk 21 and a driving device for vertically moving the plunger 30, respectively, other driving devices such as hydraulic pressure are used. It is also possible to use a drive device such as a pneumatic or pneumatic drive device.

Further, the plasticizing disk 21 is formed such that the upper and lower surfaces thereof are flat, but the plasticizing disk 21 may be formed so that the thickness thereof increases or decreases toward the outer circumference.

[0060]

As described above, according to the present invention, an extremely excellent plasticizing device for a thermoplastic resin , which has a simple and small structure and is sufficiently plasticized and kneaded.
Will be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a thermoplastic resin molding machine incorporating a plasticizing device according to the present invention.

FIG. 2 is a vertical sectional view of an injection unit in the molding machine of FIG.

FIG. 3 is a plan view of a plasticizing disc in the injection unit of FIG.

4 is a cross-sectional view of the plasticizing disc of FIG.

FIG. 5 is a diagram showing the principle of a stone mill on which a plasticizing device according to the present invention is based.

FIG. 6 is a partial cross-sectional view showing a state at the end of plasticization in a plasticizing device of a conventional conical screw type molding machine.

7 is a partial cross-sectional view showing a state at the end of injection in the plasticizing device of the conical screw type molding machine of FIG.

[Explanation of symbols]

10 molding machine 11 frames 12 Swing arm 13 Low pressure mold clamping device 14 mold 15 High-pressure mold clamping device 16 injection unit 21 plasticizing disc 22 heating plate 23 heating plate 24 Feed bush 25 Plasticizing disk motor 26 gear train 27 nozzles 28 resin pellets 29 hoppers 30 Plunger 31 Reciprocating drive mechanism 32 Plunger motor 33 gear train 34 Gas vent 40 stone mortar 41 Fixed part 42 Rotating part 43 Soybeans, etc.

Claims (5)

(57) [Claims] 1. In a thermoplastic resin injection molding machine, a disk-shaped plasticizing disk, which has a groove for taking in resin pellets spirally extending outwardly formed on an upper surface and is rotationally driven, and the plasticizing disk. A heating plate disposed so as to come into contact with the upper and lower surfaces of the disk and heated and adjusted to a predetermined temperature, and a fixed arrangement so as to face the innermost end of the resin pellet intake groove on the surface of the plasticized disk. comprising a resin pellet supply portion that is, a feed bush with a feed runner extending downward at least one to the arranged by and the inner surface so as to surround the outer periphery of the plasticizing disc liquid-tight manner, the resin pellets The intake groove faces from the inner circumference to the outer circumference.
They were once connected in a spiral shape, and could be
The first groove and the first groove.
Bypass passage and the second bypass connected to this bypass passage.
A plasticizing device for thermoplastic resin characterized by being formed with a groove . 2. A plurality of plastic disks are provided on the upper surface of the plasticizing disk.
The thermoplastic resin plasticizing apparatus according to claim 1, wherein a groove for taking in the resin pellet is formed . 3. The first groove is a plasticized disc.
The unmelted resin pellets are stored on the inner peripheral side of the
As the molten resin pellets are gradually melted,
The molten resin that was guided to the path and was further melted
The thermoplastic resin plasticizing device according to claim 1, wherein the plasticizing device is configured to be guided to the two grooves . 4. The inner surface of the feed bush is provided.
The thermoplastic resin plasticizer according to claim 1 , wherein the feed runners are provided at equal angular intervals . 5. The resin of the plasticized disc at the time of injection
The opening of the pellet intake groove should be
It is configured so that it will be stopped at a position that deviates from the guide runner.
Plasticizing unit of the thermoplastic resin according to claim 1, characterized in that the.