JPH08150644A - Resin molding method and resin molding machine - Google Patents

Abstract

PURPOSE: To carry out molding by low pressure injection without performing high pressure injection while enhancing mass productivity by injecting a molten resin while relatively moving a gate part and a cavity when the molten resin is injected into the cavity from a gate part. CONSTITUTION: A cavity 4 is formed to the moving member 6 provided in a mold in a freely slidable and movable manner and the moving member 6 is moved with respect to a gate part 3 to inject a molten resin 5 into the cavity 4 from the gate part 3. A spool pipe member 7 becoming a sprue part 2 is provided so as to advance, retreat, protrude and move with respect to a resin injection part 1 and a slit like injection port having length in an advancing, retreating and protruding direction is formed to the sprue pipe member 7 to form the gate part 3 and the cavity 4 having the width coinciding with the length of the gate part 3 is formed to the moving member 6 and the moving member 6 is moved in the direction crossing the slit like gate part 3 at a right angle to inject the molten resin 5 into the cavity 4 from the gate part 3. By this constitution, low pressure injection molding becomes possible by a simple structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molding method and a resin molding machine.

[0002]

2. Description of the Related Art In conventional resin molding, in a resin molding, a molten resin injected from a resin injecting section is passed through a runner section such as a sprue section or a runner section branched from the sprue section. It is guided inside and is injected into the cavity in the mold from the gate portion that serves as an injection port. After cooling, the mold is opened and the molded product in the cavity is projected.

In the conventional construction, the molten resin is injected into the cavity from the gate portions provided at one or a plurality of locations via the runner portion.

Therefore, if the cavity has a complicated shape or is thin and has a distance from the gate portion, the molten resin may not reach the corners of the cavity sufficiently. Sufficient injection pressure is required, and high-pressure injection is required depending on the shape of the molded product.

When the injection injection pressure is high, a difference in resin pressure occurs in the cavity (the injection pressure is high near the gate part and low when it is far from the gate part), and stress remains in the molded product. , May cause deformation. Further, because of such high pressure, the injection pressure becomes unstable, and the molding conditions are not stable, so that variations in the quality of the molded product occur.

In addition, the mold must be sufficiently heated to ensure the flow of the resin in the cavity,
The injection device is also large in size and requires precision, and a sufficient mold clamping force is required, which increases the cost of the molding machine, lowers the mass productivity of the molding machine itself, and increases the cost. Therefore, it is desirable to perform molding by low pressure injection as much as possible.

In the present invention, the conventional construction in which the gate portion is fixedly provided is changed so that the cavity has a shape that requires high-pressure injection, or even if high-pressure injection is performed, every corner of the cavity. To provide an excellent resin molding method and resin molding machine capable of mass-producing non-defective products by enabling molding by low-pressure injection with a simple structure even if the shape of resin is difficult to rotate and high-precision non-defective products cannot be mass-produced. Has an aim.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

In the resin molding method in which the molten resin 5 is fed from the resin injection portion 1 through the runner portion 2 into the cavity 4 from the gate portion 3, the molten resin 5 is fed into the cavity 4 from the gate portion 3. Gate part 3 when injecting
And a cavity 4 are relatively moved to inject the resin into the resin molding method.

Further, a cavity 4 is formed in a moving body 6 slidably provided in the mold, and the moving body 6 is moved with respect to the gate portion 3 so that the molten resin is introduced into the cavity 4 from the gate portion 3. 5. Injecting 5
It relates to the resin molding method described.

Further, a slit-shaped gate portion 3 is formed, and a cavity 4 having a width matching the length of the slit-shaped gate portion 3 is formed in the moving body 6, and the cavity 4 has a slit-shaped gate portion. The resin molding method according to claim 2, wherein the movable body 6 is moved so as to move in a direction orthogonal to the portion 3 and the molten resin 5 is injected from the gate portion 3 into the cavity 4. It is a thing.

Further, a sprue pipe body 7 serving as a runner portion 2 is provided so as to be able to move forward and backward from the resin injection portion 1, and an injection port is formed in the sprue pipe body 7 to form the gate portion 3. The resin molding according to claim 1, wherein the molten resin 5 is injected into the cavity 4 while the sprue pipe body 7 is moved so as to project from the resin injection portion 1 and the gate portion 3 is moved with respect to the cavity 4. It is related to the law.

In addition, an injection port is formed at the protruding tip of the sprue pipe body 7 to form a small hole gate portion 3.
5. The resin molding method according to claim 4, wherein the molten resin 5 is injected into the cavity 4 from the projected gate portion 3 while gradually projecting the resin from the resin injection portion 1.

The sprue rod 8 is movably provided.
The resin molding method according to any one of claims 4 and 5, wherein the sprue pipe body 7 is moved by controlling the movement of the resin.

In addition, in the resin molding machine in which the molten resin 5 is fed from the resin injection portion 1 through the runner portion 2 into the cavity 4 from the gate portion 3, the gate portion 3 and the cavity 4 are opposed to each other. When a molten resin 5 is injected from the gate portion 3 into the cavity 4 by operating the relative movement mechanism, the relative movement mechanism is activated to operate the relative movement mechanism.
The present invention relates to a resin molding machine, which is provided with a movement control mechanism for injecting while moving the cavity 4 and the cavity 4 relatively.

Further, the cavity 4 is formed in the moving body 6 slidably provided in the mold, and the relative moving mechanism is configured so that the moving body 6 can be moved with respect to the gate portion 3. The present invention relates to a resin molding machine according to claim 7.

Further, a slit-shaped gate portion 3 is formed, and a cavity 4 having a width matching the length of the slit-shaped gate portion 3 is formed in the movable body 6, and the cavity 4 has a slit-shaped gate portion. 9. The resin molding machine according to claim 8, wherein the relative movement mechanism is configured so as to be movable in a direction orthogonal to the portion 3.

Further, a sprue pipe body 7 serving as a runner portion 2 is provided from the resin injection portion 1 so as to be capable of advancing and retreating, and an injection port is formed in the sprue pipe body 7 to form the gate portion 3 to form the gate portion 3. A relative movement mechanism is configured, and the sprue tube body 7 is moved so as to project from the resin injection portion 1 to move the gate portion 3 with respect to the cavity 4 so as to inject the molten resin 5 into the cavity 4. The resin molding machine according to claim 7, wherein a control mechanism is configured.

Further, an injection port is formed at the protruding tip of the sprue pipe body 7 to form a small hole gate portion 3 to form the relative movement mechanism, and the gate portion 3 is gradually projected from the resin injection portion 1. 11. The resin molding machine according to claim 10, wherein the movement control mechanism is configured so that the molten resin 5 is injected into the cavity 4 from the protruding gate portion 3 while being allowed to move.

Further, a sprue rod 8 for moving the sprue pipe body 7 is movably provided to constitute the relative movement mechanism, and the movement control mechanism is constituted to control the movement of the sprue rod 8. Claim 10, 1
The present invention relates to the resin molding machine according to any one of 1.

[0021]

EXAMPLE This example shows a resin molding method and a resin molding machine capable of molding a thin plate-shaped molded product such as a large-sized liquid crystal substrate by low-pressure injection.

In such a thin plate-shaped molded product, if the molten resin 5 is injected into the cavity 4 from the gate portion 3 provided at one place or several places as in the conventional case, the cavity 4
It is difficult for the molten resin 5 to run inside, and it is difficult for the molten resin 5 to reach the space between the cavities 4 and the gate portion 5.

Therefore, so-called high-pressure injection molding having a sufficient injection pressure must be performed, the mold must be sufficiently heated, and a large injection device and a highly accurate injection control are required. , Also, the mold clamping force is considerably high, and the molding machine becomes very expensive,
Also, because of high-pressure injection, deformation due to difference in resin pressure may occur,
In some cases, the molding conditions were not stable and the molded products varied, and injection molding was abandoned.

In the present embodiment, a resin molding method and a resin capable of mass-producing a relatively large thin plate-shaped liquid crystal substrate, which is currently impossible to mold with resin while the demand is expected to increase, without the above-mentioned problems. An example for realizing a molding machine will be described.

That is, this embodiment is based on the following basic invention.

In the resin molding method in which the molten resin 5 is fed from the resin injection section 1 through the runner section 2 into the cavity 4 from the gate section 3, the molten resin 5 is injected into the cavity 4 from the gate section 3. Gate part 3 when injecting
And cavity 4 are moved relative to each other for injection.

That is, based on this idea, a relative movement mechanism for relatively moving the gate portion 3 and the cavity 4 is provided, and when the molten resin 5 is injected into the cavity 4 from the gate portion 3, this relative movement is performed. The molding machine is provided with a movement control mechanism that operates the mechanism to inject while moving the gate portion 3 and the cavity 4 relatively.

Various methods and their configurations are conceivable as a method for relatively moving the gate portion 3 and the cavity 4. First, the gate portion 3 is fixed and the cavity 4 is moved. An example will be described.

The molding method of the first embodiment is a molding method which belongs to any of the inventions described in claims 1 to 3, and a molding machine based on this molding method is one of the inventions described in claims 7 to 9. Also belongs to. The first embodiment will be described with reference to FIGS.

This first embodiment is based on the following method. A cavity 4 is formed in a movable body 6 slidably provided in a mold, and the movable body 6 is formed with respect to the gate portion 3.
Is moved to inject the molten resin 5 into the cavity 4 from the gate portion 3.

Moreover, a sprue pipe body 7 serving as a runner portion 2 is provided from the resin injection portion 1 so as to be movable back and forth, and a slit-shaped inlet having a length in the forward and backward projection direction is formed in the sprue pipe body 7. A slit-shaped gate portion 3 is formed, a cavity 4 having a width matching the length of the slit-shaped gate portion 3 is formed in the moving body 6, and the cavity 4 is formed.
The moving body 6 is moved so that the groove moves in a direction orthogonal to the slit-shaped gate portion 3, and the molten resin 5 is injected from the gate portion 3 into the cavity 4.

Therefore, in the molding machine for carrying out this method, the cavity 4 is formed in the movable body 6 slidably provided in the mold so that the movable body 6 can be moved with respect to the gate portion 3. And the relative movement mechanism is configured.

Further, the sprue pipe body 7 serving as the runner portion 2 is provided so as to be movable forward and backward from the resin injection portion 1, and the sprue pipe body 7 is formed with a slit-shaped injection port having a length in the forward and backward projection direction. A slit-shaped gate portion 3 is formed, a cavity 4 having a width matching the length of the slit-shaped gate portion 3 is formed in the moving body 6, and the cavity 4 is formed.
The relative movement mechanism is configured so that can move in a direction orthogonal to the slit-shaped gate portion 3.

A sprue rod 8 for moving the sprue pipe 7 is movably provided to constitute the relative movement mechanism, and the movement control mechanism is configured to control the movement of the sprue rod 8.

Therefore, the molding machine of the first embodiment is operated, for example, as follows.

From the state shown in FIG. 3, when the relative movement mechanism is actuated by the movement control mechanism to pull the sprue rod 8, as shown in FIG. 4, for example, by injection injection pressure, from the resin injection portion 1 to the sprue pipe body 7. Slides out.

The sprue pipe body 7 is formed with a slit-shaped inlet in the lengthwise direction.
As a result, the molten resin 5 is injected.

On the other hand, when the moving body 6 is moved in the direction orthogonal to the sprue pipe body 7 together with this, the gate portion 3 which is in contact with the moving body 6 is moved to the thin-walled cavity 4 formed in the moving body 6. At the position, the molten resin 5 is injected from the gate portion 3 into the cavity 4 as if the molten resin 5 was applied or placed.

In this embodiment, two cavities 4 are formed side by side on the moving body 6, and the molten resin 5 is injected into the two cavities 4 at a time by sliding the moving body 6 in one direction. In consideration of the cooling time and the operation of discharging the molded product 9 from the cavity 4, the moving body 6 is moved from the state in which the gate portion 3 is positioned between the cavities 4. After injecting into the one cavity 4, the other cavity 4 which has already been injected is arranged at a position where it is exposed and projected to the outside of the mold, and is ejected to the outside of the mold by the ejection ejector device 10 for ejecting. The molded product 9 is discharged from the formed cavity 4, and the molten resin 5 is injected into the cavity 4 which has been emptied by moving back and moving in the opposite direction again. Exposed and project in the same way. The exhaust ejector 10 provided on the side may be configured to discharge the molded article 9.

This discharge ejector device 10 is shown in FIG.
As shown in FIG. 4, the cavity 4 is once projected from the moving body 6, and the molded product 9 attached to the cavity 4 is further ejected by ejecting an ejector rod, which is not shown.

When the moving body 6 is slid to complete the injection into the cavity 4, the sprue rod 8 is moved back to move the sprue pipe 7 into the resin injection portion 1 as shown in FIG. Then, the unnecessary molded product in the sprue pipe body 7 is pushed back into the resin injecting part 1 together with the sprue pipe body 7 to be melted by the heat of the resin injecting part 1 and returned to the resin injecting part 1. As a result, the gate portion 3 is retracted from the cavity 4, unnecessary moldings are not generated, and there is no need to perform the processing (runner processing), and so-called runnerless (sprueless) in which the resin is not wasted can be realized.

In the case where the moving body 6 is moved to move the cavity 4 laterally in order to discharge the molded product 9 from the cavity 4, the sprue pipe body 7 is thus placed in the resin injection portion 1. Return to and move.

Next, a second embodiment in which the gate portion 3 is moved with respect to the cavity 4 will be described.

The molding method shown as the second embodiment belongs to the invention described in claim 1, and the molding machine based on this molding method belongs to the invention described in claim 7. Based on FIG. 6 to FIG. explain.

This molding method is applied to a so-called hot runner, and secures a wide area for the hot runner region 11 in which the molten resin 5 injected from the resin injection section 1 is held in a molten state. The damming frame 12 which functions to dam the molten resin 5 in the hot runner region 11 so that the hot runner region 11 can be enlarged or reduced is configured to be movable toward the cavity 4, and the damming frame 12
By gradually moving the hot runner area 11, the molten resin 5 is caused to flow into the cavities 4 respectively arranged on the front and back sides of the expanding hot runner area 11, and the damming frame 12 is further formed. By moving to the vicinity of the end of the cavity 4, the hot runner region 11 expands so as to cover the cavity 4 and the molten resin 5 is injected into the cavity 4.

As a result, the front and back of the hot runner region 11 are used as the gate portion 3, and the gate portion 3 is used as the cavity 4.
As a result, the molten resin 5 is injected into the cavity 4.

A molding machine based on this technique. As shown in FIGS. 6 to 8, the damming frame body 12 that functions to dam the molten resin 5 in the hot runner region 11 so that the hot runner region 11 can be enlarged or reduced can be moved toward the cavity 4. The hot runner region 11 is gradually expanded by moving the damming frame 12 so that the molten resin 5 flows into the cavities 4 respectively arranged on the front and back sides of the expanding hot runner region 11. It constitutes a relative movement mechanism.

That is, by moving the damming frame body 12, the closing core 13 arranged in the middle of the cavity 4 facing the front and back is moved, and the closing core 13 moves to open the cavity 4. The molten resin 5 is configured to be injected into the cavity 4 from the hot runner region 11 that expands as the gate portion 3 increases.

Therefore, in this second embodiment, as shown in FIG.
From the state shown in FIG. 2, the movement control mechanism including the ejector device 14 that moves the damming frame 12 is operated to actuate the damming frame.
12 is gradually moved to the cavity 4 side, and together with this, the closing core 13 arranged in the middle of the cavity 4 facing the front and back is moved, and the closing core 13 moves to open the cavity 4. From the hot runner region 11 which expands as it goes, this is used as the gate part 3 and the cavity 4
Molten resin 5 is injected into the inside.

In the present embodiment, the moving width of the damming frame 12 is set so that the planarly expanding gate portion 3 reaches the end of the cavity 4, and the hot runner region is wider and narrower than the damming frame 12. The width of 11 is the cavity 4
The width is almost the same as the width.

Therefore, as shown in FIG. 7, the damming frame 12
When is moved to the end of the cavity 4, the closed core 13 is displaced and the molten resin 5 is injected into the cavity 4.

Then, the ejector device 14 is operated again to push back the damming frame body 12, the cavity 4 is again closed by the closing core 13, and the molded product 9 is discharged from the cavity 4 by an appropriate means. In this case as well, the damming frame 12 is configured to be pushed back and moved, and the gate portion 3 is moved to the cavity 4
It is possible to evacuate from, and unnecessary resin can be pushed back to realize spruelessness.

Next, with respect to the cavity 4, the gate portion 3
The third embodiment will be described as another example of the movement.

The molding method shown as the third embodiment belongs to any of the inventions described in claims 1, 4, 5 and 6, and a molding machine based on this molding method is described in claims 7, 10, 11 and 12. The present invention belongs to any of the inventions, and will be described with reference to FIGS. 9 to 13.

In this molding method, the resin injection part 1 to the runner part 2 are used.
The sprue pipe body 7 is provided so as to be able to move forward and backward, and the sprue pipe body 7 is moved from the resin injection portion 1 to form the gate portion 3 by forming an injection port at the projecting tip end portion of the sprue pipe body 7. The molten resin 5 is injected into the cavity 4 while moving the gate portion 3 with respect to the cavity 4 so as to project and move. The gate portion 3 is gradually injected into the resin injection portion 1.
The molten resin 5 is injected into the cavity 4 through the protruding gate portion 3 while protruding from the inside.

Further, the sprue rod 8 is movably provided.
Is controlled to move the sprue pipe body 7.

A molding machine based on this method is provided with a resin injection section 1
The sprue pipe body 7 serving as the runner part 2 is provided so as to be able to move forward and backward, and the sprue pipe body 7 is provided with an injection port at the protruding tip end portion thereof to form the small hole gate part 3 to form the relative movement mechanism. Then, by moving the sprue pipe 7 by the sprue rod 8 to gradually project the gate portion 3 from the resin injection portion 1, the molten resin 5 is injected from the moving gate portion 3 into the cavity 4. And constitutes the movement control mechanism.

Therefore, the molding machine of the third embodiment operates as follows, as shown in FIGS. 9 to 13, for example.

When the movement control mechanism is operated from the state shown in FIG. 9 and the sprue rod 8 is gradually pulled, the sprue pipe body 7 gradually projects from the resin injection portion 1 by the injection injection pressure as shown in FIG.

When the small-hole gate portion 3 formed in the sprue pipe body 7 reaches the cavity 4, the molten resin 5 flows from the gate portion 3 into the cavity 4 through the sprue pipe body 7.
Is injected.

If the gate portion 3 remains as it is, the cavity 4 is formed.
If it does not move with respect to the molten resin 5, it is difficult for the molten resin 5 to flow into the cavity 4 at a low pressure as in the conventional example. However, in the present embodiment, the sprue pipe body 7 gradually protrudes, so that the gate portion 3 moves to the end of the cavity 4, and as shown in FIG. 11, when the sprue pipe 7 moves by the sprue rod 8 and the gate part 3 reaches the end of the cavity 4, low pressure is sufficient. Cavity 4
Molten resin 5 will be injected into the inside.

In the present embodiment, the cavities 4 are arranged side by side with the sprue pipe body 7 as a boundary, and two small hole gate portions 3 are formed in the sprue pipe body 7 accordingly.

Then, as shown in FIG. 11, when the injection is completed, the sprue rod 8 once pushes the sprue pipe body 7 back into the resin injecting portion 1 and the unnecessary molded product is put into the resin injecting portion 1. Even if the unnecessary molded product is returned and is solidified, it is melted and returned by the heat of the resin injecting portion 1 to realize the runnerless (sprueless) as described above. Further, since this sprueless pushes the unnecessary molded product back into the resin injection part 1 together with the sprue pipe body 7, even if the resin 5 in the sprue pipe body 7 is melted, it can be pushed back smoothly into the resin injection part 1.

Then, the ejector rod 10A of the discharge ejector device 10 is caused to project, and the molded product 9 is pushed down from the left and right cavities 4 as shown in FIG.

[0065]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, it is possible to obtain a good product with high precision in which the resin does not easily turn to every corner of the cavity even if the shape has conventionally required high-pressure injection, or even when high-pressure injection is performed. Even if the shape is difficult to mold, it can be molded by low-pressure injection with a simple structure, and an excellent resin molding method and resin molding machine that can mass-produce good products.

Claims 2, Claim 4, Claim 7, Claim 1
In the invention described in 0, the gate portion and the cavity can be easily moved relative to each other, and the resin molding method and the resin molding machine are excellent in practicality.

In particular, in the inventions of claims 4 and 10, sprueless without producing unnecessary moldings is possible.

Further, in the third and eighth aspects of the present invention, by simply moving the movable body in a predetermined direction, it is possible to perform good injection even at low pressure from the front and rear ends to the left and right ends of the cavity. The resin molding method and the resin molding machine are extremely practical and can realize the object of the present invention with a simpler configuration.

According to the fifth and eleventh aspects of the present invention, when the gate portion is moved with respect to the cavity, low-pressure injection into the cavity can be performed better, and the object of the present invention is simpler. The resin molding method and the resin molding machine are extremely practical and can be realized.

According to the sixth and twelfth aspects of the present invention, the movement control of the sprue pipe body is facilitated, and the sprue pipe body is easily moved so that the gate portion and the cavity provided in the sprue pipe body are relatively moved. It is a resin molding method and resin molding machine that can be controlled for movement and have excellent practicability.

[Brief description of drawings]

FIG. 1 is a schematic configuration perspective view of a first embodiment.

FIG. 2 is a schematic cross-sectional view of a main part of the first embodiment.

FIG. 3 is a front sectional view for explaining the operation before injection injection in the first embodiment.

FIG. 4 is a sectional front view for explaining the operation of the first embodiment during injection and injection.

FIG. 5 is a sectional view for explaining the operation of the first embodiment upon completion of injection and injection.

FIG. 6 is a front sectional view for explaining the operation of the second embodiment before injection and injection.

FIG. 7 is a front sectional view for explaining the operation during the injection and injection of the second embodiment.

FIG. 8 is a sectional view for explaining the operation at the time of completion of injection and injection in the second embodiment.

FIG. 9 is a front sectional view for explaining the operation before injection and injection of the third embodiment.

FIG. 10 is a front sectional view for explaining the operation during the injection and injection of the third embodiment.

FIG. 11 is a front sectional view for explaining the operation at the time of completion of injection injection in the third embodiment.

FIG. 12 is a sectional view for explaining the operation when the mold of the third embodiment is released from the mold.

FIG. 13 is a sectional front view for explaining the operation of the third embodiment when discharging a molded product.

[Explanation of symbols]

 1 Resin injection part 2 Runner part 3 Gate part 4 Cavity 5 Molten resin 6 Moving body 7 Sprue pipe body 8 Sprue rod

Claims (12)

[Claims] 1. In a resin molding method, in which molten resin is fed from a resin injection part through a runner part into a cavity from a gate part to perform resin molding, when the molten resin is injected from the gate part into the cavity, A resin molding method characterized by injecting while moving a part and a cavity relatively. 2. A cavity is formed in a movable body slidably provided in a mold, and the movable body is moved with respect to a gate part to inject a molten resin into the cavity from the gate part. The resin molding method according to claim 1. 3. A slit-shaped gate portion, wherein a cavity having a width matching the length of the slit-shaped gate portion is formed in the movable body, and the cavity is orthogonal to the slit-shaped gate portion. The resin molding method according to claim 2, wherein the movable body is moved so as to move in a direction in which the molten resin is injected into the cavity from the gate portion. 4. A sprue tube body, which serves as a runner portion, is provided so as to advance and retreat from the resin injecting section so as to be able to move forward and backward, and an injection port is formed in the sprue tube body to form the gate section. The resin molding method according to claim 1, wherein the molten resin is injected into the cavity while moving the gate portion relative to the cavity by moving the gate portion so as to project from the injection portion. 5. A small hole gate portion is formed by forming an inlet at the protruding tip portion of the sprue pipe body, and the gate portion is gradually protruded from the resin injecting portion while the protruding gate portion is inside the cavity. The resin molding method according to claim 4, wherein molten resin is injected into the resin. 6. The resin molding method according to claim 4, wherein the sprue rod is movably controlled to move the sprue pipe body. 7. A relative moving mechanism for relatively moving a gate portion and a cavity in a resin molding machine for feeding a molten resin from a resin injection portion through a runner portion into a cavity from a gate portion to perform resin molding. When the molten resin is injected into the cavity from the gate part, a movement control mechanism is provided to operate the relative movement mechanism to relatively move the gate part and the cavity to inject the molten resin. Resin molding machine. 8. A cavity is formed in a movable body which is slidably movable in a mold, and the relative movement mechanism is configured so that the movable body can be moved with respect to a gate portion. The resin molding machine according to claim 7. 9. A slit-shaped gate portion, wherein a cavity having a width matching the length of the slit-shaped gate portion is formed in the moving body, and the cavity is orthogonal to the slit-shaped gate portion. 9. The relative movement mechanism is configured so as to be movable in the direction of movement.
The described resin molding machine. 10. A relative movement mechanism is provided by providing a sprue tube body, which serves as a runner portion, so as to advance and retreat from the resin injecting section so that the sprue tube body can be moved forward and backward to form an injection port to form the gate section. Then, the movement control mechanism is configured to inject the molten resin into the cavity while moving the gate portion with respect to the cavity by projecting and moving the sprue pipe body from the resin injecting portion. Item 7. A resin molding machine according to Item 7. 11. The relative movement mechanism is configured by forming a small-hole gate part by forming an injection port at the protruding tip part of the sprue pipe body, and by gradually making the gate part protrude from the resin injection part, The resin molding machine according to claim 10, wherein the movement control mechanism is configured to inject the molten resin into the cavity through the protruding gate portion. 12. The relative movement mechanism is configured by movably providing a sprue rod for moving the sprue pipe body, and the movement control mechanism is configured to control the movement of the sprue rod. The resin molding machine according to any one of 10 and 11.