JPH05192972A - Polymer alloy molding method and molding machine thereof - Google Patents

Abstract

PURPOSE:To perform infection molding simply in an optional blending ratio by reversing the feed-out direction and forming a space in a feed-out layer during the feed-out in a main material resin, forcibly injecting a sub-material resin into said feed-out layer from the injection waiting process, filling the space and then mixing while feeding out. CONSTITUTION:A main material resin R1 is filled in a heating cylinder 22 by driving a rotating motor 32 in the feeding direction, and the end of a small heating cylinder 5 is protruding by said filling. Then, the sub-material resin R2 is fed out to the end of the small heating cylinder 5 by driving a servo motor 9. The small heating cylinder 5 is filled with the sub-material resin R2 and retained by the given pressure. Then, the kneading screw 23 is rotated in the reverse direction and a hollow is formed in a part of resin in the heating cylinder 22. The resin R2 pressurized and retained in said hollow is injected. The feeding quantity of resin R2 in the rotating time in the forwarding direction and in the rotating time in the reversing direction, therefore, can be adjusted, and then molten resin is injected by the forward movement of the screw 23. Therefore, a polymer alloy molded material of optional fusing ratio is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polymer alloy molding method and a molding machine for molding a plurality of resins by fusing them like an alloy.

[0002]

2. Description of the Related Art Polymer alloy molding is known, in which a plurality of resins are fused like alloys and molded. However, such molding is usually carried out by mixing a predetermined material resin in the raw material stage. It is performed by using the raw material for an injection molding machine or the like.

However, in such conventional polymer alloy molding, not only is it necessary to use a specific raw material for polymer alloy molding, but there is a problem that the fusion ratio cannot be arbitrarily selected with this specific raw material.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a polymer alloy molding machine which can be freely selected in a fusion ratio and which does not require the use of a specific polymer alloy raw material and has a high degree of utilization.

[0005]

Thus, according to the invention according to "Claim 1" of the present application, "the main material resin and the sub material resin are plasticized, and are kneaded and fused until they are sent in a certain direction and stored in a certain amount. Is a polymer alloy molding method of injection molding after, the step of plasticizing the main material resin (R1) to at least a semi-molten state under heating and delivering it in a certain direction, and at least the auxiliary material resin (R2) under heating. In parallel with the injection standby process of plasticizing to a semi-molten state and maintaining pressure, the main material resin (R
During the delivery step of 1), the delivery direction is reversed to form a void in the delivery layer of the main material resin, and the auxiliary material resin (R2) is interrupt-injected into this delivery layer from the injection standby step to form the above void. A method for molding a polymer alloy, characterized in that the material is filled and then delivered in a certain direction again.

In the polymer alloy molding method of the present invention, the main material resin (R1) and the auxiliary material resin (R2) are plasticized independently of each other, and plasticized during the injection step of the main material resin (R1). The secondary material resin (R2) is injected and injected to mix and fuse in the injection process.
By adjusting the injection amount of 2), there is an advantage that a polymer alloy fused at an arbitrary ratio can be provided.

As a device embodying the polymer alloy molding method of the present invention, it is possible to provide the molding machine of the invention according to "claim 2". That is, according to the invention of "Claim 2," the "main material resin and the auxiliary material resin are kneaded by a screw in a heating cylinder while being sent in a certain direction and stored in a certain amount, and after being fused in this process, injection is performed. A polymer alloy molding machine for molding, which is a hopper (21) for supplying resin as a main material.
A main heating cylinder (22) having a base portion, and a main material resin (R1) supplied into the main heating cylinder (22) is kneaded and plasticized, is fed to the tip portion, and is retracted to a predetermined amount at the tip portion. It is supplied into the injection device (A) consisting of the main screw (23) to be injected after being stored, the auxiliary heating cylinder (5) having the auxiliary material resin injection hopper (7) at the base, and the auxiliary heating cylinder (5). Sub-screw that can be sent to the tip part while kneading and plasticizing the sub-material resin (R2) and injecting this
(6) and an injection device (B) consisting of a check valve (51) for preventing the reverse flow of the resin into the sub-heating cylinder (5) from the tip part of the injection device (B). Main end of the heating cylinder (5) with the tip of the heating cylinder (5) located closer to the tip than the hopper setting position of the injection device (A).
The main screw (23) is connected to communicate with the main heating cylinder (22), and the main screw (23) rotates in the reverse direction for an arbitrary set time out of the forward rotation time of the main screw (23) required to store a fixed amount. At this time, the auxiliary screw (6) is driven to inject the auxiliary material resin (R2) into the main heating cylinder (22), and after filling the voids of the main material resin delivery layer generated by the reverse rotation, Provided is a polymer alloy molding machine (1) characterized in that it comprises at least an interrupt injection control section (41) for controlling the injection device (A) so as to return the main screw (23) to the forward rotation. .

In the molding machine (1) of the above invention, an injection device
In (A), an ordinary injection device including a heating cylinder, a material resin supply hopper, and a screw for delivering / injecting can be used as its basic configuration. And the injection device (A) of the present invention
At any position on the tip side of the hopper setting position,
The tip of the sub-heating cylinder (5) of the injection device (B) described below is connected. In addition, the main screw built into this injection device (A)
The drive unit (4) for driving (23) is configured to be able to control the rotation operation based on a command from an interrupt control unit (4) described later.

The injection device (B) comprises a sub-heating cylinder (5) containing a sub-screw (6), a sub-material resin injection hopper (7) connected to the base of the sub-heating cylinder (5), The drive unit (9) drives the sub-screw (6). In addition, the sub-heating cylinder
A check valve (51) for preventing backflow of the resin is provided at the tip of the inside of (5). Drive unit (9) for driving the auxiliary screw (6)
May be configured so that its operation can be controlled by a command from an interrupt control unit (41) described later, but may also be configured by a servo motor or the like capable of independent feedback control.

The interrupt control section (41) provided in the molding machine (1) of the present invention controls at least the drive section of the injection device (A) to control the predetermined amount of the main material resin (R1) to an arbitrary amount. Secondary material resin (R2)
So that it is interrupted. As a specific control example, for example, the forward rotation operation time (T) of the main screw (23) required to store a constant injection amount at the tip of the main heating cylinder (22) of the injection device (A). ), The reverse rotation is performed for a preset arbitrary time (t), and the drive unit (9) of the injection device (B) is stopped after the time t, and then the remaining time main screw (23) is forwardly rotated again. One example is a program that operates in rotation. In the above control, the servomotor (9) capable of feedback control to the drive unit of the injection device (B)
When using, the start and stop of this drive unit can be controlled by the servo motor itself, and therefore the interrupt control unit (4
The control in 1) can be simplified.

[0011]

According to the invention of "Claim 1" of the present application, another injection waiting step is performed during the step of plasticizing the main material resin (R1) to at least a semi-molten state under heating and delivering it in a certain direction. By injecting the secondary material resin (R2) that has been plasticized into a semi-molten state by arbitrarily interrupting it and then continuing the delivery process again,
The auxiliary material resin is mixed with the main material resin at an arbitrary ratio, melted, and then injection-molded as a polymer alloy.

According to the invention of "Claim 2", when the main material resin (R1) is supplied into the main heating cylinder (22) through the hopper (21) and the main screw (23) is rotated in the forward direction. The main material resin (R1) is heated and kneaded in the main heating cylinder (22), plasticized into a semi-molten state, and sent and stored toward the tip of the main heating cylinder (22). Even if the main material resin (R1) enters the connection part of the auxiliary heating cylinder (5) in the process, it flows out into the auxiliary heating cylinder (5) by the check valve (51) provided in the auxiliary heating cylinder (5). Is prevented. On the other hand, in the injection device (B), the auxiliary material resin (R2) supplied to the auxiliary material resin injection hopper (7)
Is heated and kneaded in the sub-heating cylinder (5) by the sub-screw (6) and sent to the tip end while being plasticized.
Since the tip of (5) is blocked by the resin (R1) of the main material being fed, the tip of the sub-heating cylinder (5) is stored in the tip of the sub-heating cylinder (5) and is in a pressurized state.

After a predetermined time (T ₁ ) has elapsed since the injection operation by the forward rotation of the main screw (23) in the injection device (A) was started, it is preset by a command from the interrupt control unit (41). The main screw (23) is rotated in the reverse direction for any given time (t). As a result, voids are generated in the main material resin (R1) being delivered. At this time, the auxiliary material resin (R2) standing by at the tip of the auxiliary heating cylinder (5) in a pressurized state immediately becomes the main heating cylinder (22).
It is injected into the inside and injected into the delivery layer of the main material resin (R1). The interrupt injection of the secondary material resin (R2) continues until the reverse rotation time (t) described above elapses, and thereafter, the secondary material resin (R2) is injected.
Injection is automatically stopped or stopped by the interrupt control unit. In the main heating cylinder (22), the main screw (23) is again rotated in the forward direction according to a command from the interrupt control section (41). As a result, the auxiliary material resin (R2) that was interrupt-injected is the main material resin before and after.
While being heated and kneaded with (R1), it is delivered to the tip, fused together while being stored there, and after reaching a predetermined amount of storage, it is injected from the main heating cylinder (22) by the main screw (23). The Rukoto.

[0014]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Example 1 FIG. 1 is a schematic configuration diagram including a cross section of a main part of an example of a polymer alloy molding machine for carrying out the method of the present invention. The polymer alloy molding machine (1) in the figure is mainly composed of an injection device (A) and an injection device (B). The injection device (A) includes a heating and kneading section (2), a rotation / slide drive section (3) and a drive control section.
(4) and the injection device (B) is an injection device.
It is connected to the heating and kneading section (2) of (A).

First, the injection device (A) will be described. The heating and kneading section (2) includes a heating cylinder (22) having a resin supply hopper (21) at its base, and a kneading screw inserted into the heating cylinder (22).
(23) and the mold connecting part (2
4) consists of The kneading screw (23) is provided with a check ring (23a) at its front end, and its rear end is connected to a rotation / slide drive unit (3) described later.

The rotary / slide drive unit (3) is a rotary / slide shaft (31) connected to the rear end of the kneading screw (23).
A rotation motor (32) for rotationally driving the rotation / slide shaft (31), a slide motor (33) for sliding the rotation / slide shaft (31) forward, and a drive transmission member. There is. The rotating / sliding shaft (31) has a front end connected to the rear end of the kneading screw (23) via a connecting member (34), and a spline shaft is formed at the rear end thereof. The spline boss (31a) is inserted into the spline boss (31a), and the spline boss (31a) is the rotation motor (32).
It is fixed to the center of the rotary gear (32a) that meshes with.
Therefore, when the rotation motor (32) is driven, the rotation gear (32a)
The rotation / slide shaft (31) rotates through the connection member (34).
The kneading screw (23) is rotated through the.

The connecting member (34) is a connecting housing (35).
It is rotatably supported by a bearing inside. A cylindrical slide housing (36) is integrally connected to the connecting housing (35), and the rotary / slide shaft (31) is inserted into the slide housing (36). A slide member (37) is screwed onto the outside of the main body of the slide housing (36), and the slide member (37) is the center of a rotary gear (33a) meshing with the slide motor (33). It is fixed to the section. Therefore, when the slide motor (33) is driven, the slide member (37) rotates via the rotary gear (33a), and the slide housing (36) screwed with the inner surface of the slide member (37) slides. It will be moved. The slide member (37) is rotatably supported in the housing (38) via bearings.

Therefore, the kneading screw (23) gradually retreats while maintaining rotation as the resin kneaded material is accumulated at the tip of the heating cylinder (22) through the check ring (23a). This is because the spline shaft at the rear end of the rotation / slide shaft (31) can be retracted along the spline boss (31a) via the connecting member (34). As a result, a certain amount of the resin kneaded material can be stored at the tip of the heating cylinder (22). When the fixed amount is stored, the slide member (37) is rotated when the slide motor (33) is rotated with respect to the retracted rotation / slide shaft (31), and the slide housing (36) screwed with this is rotated. ) Moves forward, the kneading screw (23) can move forward through the connecting housing (35) and the connecting member (34), and at this time, the check ring (23a) operates to prevent leakage of the resin kneaded material to the rear. Since this is prevented, the resin kneaded material can be injected from the mold connecting portion (24).

The drive control section (4) includes an input setting section (41), a driver circuit section (42) of the rotation motor (32), and a slide motor.
The driver circuit section (43) of (33) and the timer means (44) are provided, and the forward rotation time (T) and the reverse rotation time (t) can be arbitrarily set in the input setting section (41). The reverse rotation time (t) can be arbitrarily set in the direction rotation time (T), and the driver circuit (42) of the rotation motor (32) is driven for (T + t) hours and then the slide motor (33). 2) is configured so that a program for switching to driving the driver circuit (43) can be set.

Next, the structure of the injection device (B) will be described with reference to FIG. The injection device (B) has a small heating cylinder (5),
A small screw (6) inserted in this small heating cylinder (5),
Small hopper (7) connected to the base of the small heating cylinder (5)
A drive shaft portion (8) that rotatably supports the small screw (6), and a servo motor (9) that drives the drive shaft portion (8).
It consists of and. The small heating cylinder (5) is connected to the middle portion of the heating cylinder (22) of the injection device (A) so as to communicate substantially vertically. A check valve (51) for preventing the inflow of the kneaded material from the heating cylinder (22) of the injection device (A) is provided on the inner wall of the tip of the small heating cylinder (5). Servo motor above (9)
If the holding pressure of the resin kneaded material that is kneaded by the small screw (6) at the tip of the small heating cylinder (5) and sent out is above a predetermined value, the drive stops, and if it falls below this, it will automatically Is configured to drive.

Therefore, in the injection device (B), the small heating cylinder (5)
In the situation where the tip of the small hopper (7) is closed, the material supplied from the small hopper (7) is kneaded by the rotation of the small screw (6), plasticized by heating, delivered to the tip, and held at the tip. However, the holding pressure rises as the feeding continues, and when it reaches a predetermined value, the kneading and feeding are automatically stopped, and the holding pressure becomes lower than the predetermined value due to the opening of the tip of the small heating cylinder (5). When the temperature is lowered, kneading and feeding are automatically performed, and the resin kneaded material is always stored with a holding pressure of a certain value or more.

The operation of the polymer alloy molding machine (1) of the present invention constructed as above will be described. First, the molding material resin (R1) is prepared in the hopper (21), and the additive resin (R2) is prepared in the small hopper (7). Both the heating cylinder (22) and the small heating cylinder (5) are heated to a predetermined temperature. In parallel with this, the input setting section of the drive control section (4)
In (41), the forward rotation time (T) and the reverse rotation time (t) are set, and the interruption of t is T ₁ → t → T ₂ (however, T = T ₁ + T ₂ ), and T Set the program that drives the driver circuit (42) of the rotation motor (32) and then the driver circuit (43) of the slide motor (33) as 1 cycle of molding after ₁ → t → T _2. To do.

Prior to operating according to the above program, the driver circuit (42) of the rotation motor is driven to
(R1) is taken from the hopper (21) into the heating cylinder (22) while being kneaded and plasticized, and the entire heating cylinder (22) is filled with a plasticized kneaded product of this resin (R1). deep. At this time, the plasticized kneaded material of the resin (R1) does not flow into the small heating cylinder (5) by the check valve (51), and this filling causes the small heating cylinder to flow.
(5) The tip is closed. Then, the injection device (B)
, Start the servo motor (9) and add the additive resin (R
2) is taken from the small hopper (7) into the small heating cylinder (5) and is kneaded to be plasticized, and is sent to the tip of the small heating cylinder (5) as a plasticized kneaded product of the resin (R2). Let At this tip, since the tip is blocked by the resin (R1), the plasticized kneaded material of the resin (R2) to be sent out starts to accumulate, but when this reaches the predetermined holding pressure, this pressure is fed back and the servo motor is fed back. (9) is stopped. In this state, the plasticized kneaded material of the resin (R2) is held under pressure in the small heating cylinder (5).

After the above operation, the molding machine (1) is operated according to the program set above. First during the time T ₁ is first kneading screw (23) is rotated in the forward direction by the driver circuit (42), is sent plasticizing kneaded product of the resin (R1), the neck of the screw (23) (25) through heating tube
It is stored at the tip of (22). With this storage,
The kneading screw (23) retreats while rotating in the forward direction.

When the time T ₁ has elapsed, the drive controller (4) controls the driver circuit (42) to rotate the kneading screw (23) in the opposite direction. As a result, the filled state of the plasticized kneaded material of the resin (R1) in the heating cylinder (22) begins to loosen, and a part of the resin (R1) retreats with the reverse rotation of the screw (23) to form a cavity. Immediately after that, the resin is injected from the injection device (B) that is held under pressure.
The plasticized kneaded product of (R2) begins to be injected. This injection is performed until the time t has elapsed.

When the time t has elapsed, the drive control unit (4) is again activated.
Then, the driver circuit (42) is controlled to rotate the kneading screw (23) in the forward direction. By this, kneading and plasticization proceed again in a state where a predetermined amount of the plasticized kneaded material of the resin (R1) is injected between the plasticized kneaded material of the resin (R1) and the resin (R1) from the rear.
The plasticized kneaded product is replenished and stored at the tip of the heating cylinder (22), where it is mixed and melted.

When the time T ₂ has elapsed, the drive control section (4) switches the drive of the driver circuit (42) to the drive of the driver circuit (43), the rotation of the kneading screw (23) is stopped, and the kneading is performed. The screw (23) is moved forward in the heating cylinder (22).

As a result, the melt obtained by fusing the resin (R1) supplied in a predetermined amount by the time (T ₁ + T ₂ ) and the resin (R2) supplied in a predetermined amount by the time t is a mold connection portion. It will be injected into a mold (not shown) through (24).

[0029]

According to the present invention, a polymer alloy molded product having an arbitrary fusion ratio can be molded by arbitrarily setting the forward rotation time and the reverse rotation time of the kneading screw. Further, the polymer alloy raw material is not required, and the polymer alloy molding can be performed using the general resin as the raw material at an arbitrary fusion ratio. Furthermore, polymer alloy molding can be easily performed using recycled materials. Furthermore, since the forward and reverse rotations can be repeated every time the auxiliary material is injected, the forward and reverse plasticization can be performed, and the auxiliary material can be uniformly kneaded with the main material.

[Description of Drawings]

FIG. 1 is a schematic configuration diagram including a cross section of a main part of an example of a polymer alloy molding machine for carrying out the method of the present invention.

FIG. 2 is a schematic view of a main part of FIG.

[Explanation of symbols]

 (1)… Polymer alloy molding machine (2)… Heating and kneading section (3)… Rotation / slide drive section (4)… Drive control section (5)… Small heating cylinder (6)… Small screw (7) … Small hopper (8)… Drive shaft (9)… Servomotor (21)… Hopper (22)… Heating tube (23)… Kneading screw (23a)… Check ring (31)… Rotation / sliding shaft (32) )… Rotating motor (33)… Slide motor (34)… Coupling member (35)… Coupling housing (36)… Sliding housing (37)… Sliding member (41)… Input setting section (42) … Rotating motor driver circuit (43)… Slide motor driver circuit (44)… Timer means (A)… Injection device (B)… Injection device

Claims (2)

[Claims] 1. A polymer alloy molding method in which a main material resin and a sub material resin are plasticized, sent in a fixed direction, kneaded and fused until a fixed amount is stored, and then injection molded. The step of sending the main material resin in parallel with the step of plasticizing to at least a semi-molten state and sending in a certain direction in parallel with the injection standby step of plasticizing the auxiliary material resin to at least a semi-molten state under heating and holding the pressure. Inside, a void is formed in the delivery layer of the main material resin by reversing the delivery direction, and the auxiliary material resin is interrupt-injected into this delivery layer from the injection waiting step to fill the above-mentioned void, and then again in a fixed direction. A method for forming a polymer alloy, which comprises delivering the polymer alloy. 2. A polymer alloy molding machine in which a main material resin and a sub material resin are kneaded by a screw in a heating cylinder, delivered in a certain direction, stored in a certain amount, and fused in this process and then injection molded. , A main heating cylinder having a hopper for supplying the main material resin at the base,
And an injection device composed of a main screw for kneading and plasticizing the main material resin supplied into the main heating cylinder, sending it to the tip portion, retreating, storing a fixed amount at the tip portion, and then injecting it, and sub-material resin injection Sub-heating cylinder having a hopper for the base, a sub-screw capable of kneading and plasticizing the sub-material resin supplied into the sub-heating cylinder and delivering the same to the tip, and from this tip to the sub-heating cylinder An injection device comprising a check valve for preventing backflow of resin is provided, and the tip of the auxiliary heating cylinder of the injection device is connected so as to communicate with the main heating cylinder on the tip side of the injection device hopper setting position. In addition, the main screw is rotated in the reverse direction for an arbitrary set time of the forward rotation time of the main screw required to store a fixed amount at the tip of the main heating cylinder, and at this time, the sub screw is driven to perform the main heating. Secondary material tree in the cylinder After injecting fat and filling the voids of the main material resin delivery layer generated by the reverse rotation, at least an interrupt injection control unit for controlling the injection device is provided so as to return the main screw to the forward rotation. Characteristic polymer alloy molding machine.