JPH10109328A - Molding device and removing method of fixed resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding device capable of removing a fixed resin in a sprue without damaging a mold and a method to remove the fixed resin material from the sprue part using the molding device. SOLUTION: A removing member 41 is arranged coaxially with a sprue part 7 with the help of a support member 51, and then is moved into and from the sprue part 7 by transferring a nozzle 2 or a mold. Consequently, the removing member 41 can be moved to or from the sprue part 7 without coming into contact with the sprue part 7 and remove a fixed resin material from the sprue part 7 without damaging the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding apparatus for molding a light-permeable object such as a CD (compact disk) or an LD (laser disk), and uses the molding apparatus. The present invention relates to a method for removing a fixed resin material.

[0002]

2. Description of the Related Art Conventionally, when a molded body is formed using a resin material that can transmit light, such as a CD or an LD,
A molding apparatus 1 having a structure as shown in FIG. 8 is used. Such a molding apparatus 1 is roughly provided with a nozzle 2 for injecting a plasticized molten resin for molding the molded body, a fixed mold 4 and a movable mold 9, and the molten resin Is formed between the fixed mold 4 and the movable mold 9. A sprue bush 6 having a concave portion 13 in which the nozzle 2 can advance and retreat and a sprue portion 7 communicating the concave portion 13 and the gap portion 12 is attached to the fixed mold 4. The sprue bush 6 is positioned with respect to the fixed mold 4 by fitting the sprue bush 6 to the inner peripheral surface 5a of the localization ring 5 provided on the fixed plate 3. The sprue bush 6 is fitted to the localization ring 5 so that the sprue portion 7 is arranged coaxially with the localization ring 5 and the nozzle 2.

In such a molding apparatus 1, in order to inject the plasticized molten resin into the cavity 12, the nozzle 2 descends and the contact surface 6 of the bottom 6a of the sprue bush 6 is formed.
b, and the injection hole 2a of the nozzle 2 and the sprue portion 7 communicate with each other. Then, the plasticized molten resin is injected from the nozzle 2 by a plunger (or screw),
The injected molten resin is injected into the gap 12 through the sprue 7 of the sprue bush 6. After resin injection
In order to open the mold by driving the movable mold 9 and at the same time peel the molded article from the movable mold 9, air is blown to the molded article from the passage 10 provided in the movable mold 9. . After the mold opening is completed, the sprue portion 7 and the molded body are protruded, and at the same time, air is blown from the passage 10 to the molded body, and the molded body is separated from the movable mold 9. After the peeling operation is completed, the molded body is transferred to the outside of the molding machine by the take-out machine.

[0004]

However, in the structure of the conventional molding apparatus 1, when the molded body is taken out from the movable mold 9, the resin remains in the sprue portion 7 and the resin cannot be taken out. There is. In this case, the sprue portion 7
A method in which a stick protruding from the side of the nozzle 2 is pressed against the resin fixed in the inside and a shock is applied to the stick protruding with a hammer to forcibly remove the fixed resin from the sprue portion 7, or even this method If the resin cannot be removed, the movable mold 9 is opened, and a protruding rod heated by a burner or the like is pushed into the sprue part 7 from the movable mold part 9 against the resin fixed in the sprue part 7, and the above-mentioned fixed resin The method of taking out is taken. However, since such a method is performed by manually arranging the protruding rod on the sprue portion 7 by eye measurement, it is important that the protruding bar damages the fixed mold 4 and the sprue portion 7. Have a problem. In particular, the sprue portion 7 is an important part that affects the molding conditions of the molded body, and is very expensive. Therefore, if the sprue portion 7 is damaged, the molding conditions change, and a situation occurs in which the expensive sprue portion 7 must be replaced. The present invention has been made in order to solve such a problem, and a molding device capable of removing a resin adhered in a sprue portion without damaging a mold, and a molding device using the molding device to remove a resin from a sprue portion. An object of the present invention is to provide a method for removing a fixed resin material.

[0005]

According to a first aspect of the present invention, there is provided a molding apparatus comprising: a nozzle for injecting a resin material for molding a molded body in a gap provided in a mold; A concave portion having a contact surface with which the tip of the nozzle comes into contact, and a sprue portion which guides the resin material ejected from the nozzle to the gap by contact of the tip with the contact surface due to movement of the nozzle. And a sprue bushing having a sprue bushing for removing the resin material fixed in the sprue portion from the sprue portion, the resin material being able to enter the sprue portion in a non-contact state with the sprue portion. And a support member for supporting the removing member coaxially with the sprue portion.

A method for removing a fixed resin material according to a second aspect of the present invention comprises a nozzle for injecting a resin material for molding a molded body in a void provided in a mold, and a movement of the nozzle for moving the nozzle. A sprue having a recess having a contact surface with which the tip abuts, and a sprue having the tip abutting on the abutment surface by movement of the nozzle to guide the resin material ejected from the nozzle to the gap; A method of removing a fixed resin material in the sprue portion, the method being performed by a molding device having a bush, wherein after the molded body is molded, the sprue portion can enter the sprue portion in a non-contact state. A rod-shaped removing member for removing the resin material fixed in the sprue portion from the sprue portion is supported by a support member coaxially with the sprue portion, and The end is brought into contact with the tip of the nozzle, and the nozzle is moved to the sprue side in the same manner as the movement of the nozzle for injecting the resin material. The removal member is moved to the sprue portion side to push the fixed resin material out of the sprue portion.

In a third aspect of the present invention, a method for removing a fixed resin material includes a nozzle for injecting a resin material for molding a molded body in a cavity provided in a mold, and moving the nozzle to move the nozzle. A concave portion having a contact surface with which the tip of the nozzle comes into contact, and a sprue portion which guides the resin material ejected from the nozzle to the gap by contact of the tip with the contact surface due to movement of the nozzle. A method of removing a fixed resin material in the sprue portion, the method being performed by a molding device having a sprue bush having the sprue bush. A rod-shaped removing member for removing the resin material that can enter and is fixed in the sprue portion from the sprue portion is supported by the mold with a support member coaxially with the sprue portion, Before or after supporting the supporting member on the mold, the removing member is heated to a temperature equal to or higher than the glass transition point of the resin material, the mold is moved to the sprue bush side, and the mold is clamped to remove the removing member. Is pressed into the resin material fixed in the sprue portion, and the resin material melted by the heated removing member is re-solidified to fix the resin material to the removing member. By performing mold opening to move to the bush side, the fixing resin material is pulled out from the sprue portion together with the removing member.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding apparatus according to an embodiment of the present invention and a method for removing a resin material fixed in a sprue portion of the molding apparatus will be described below with reference to the drawings. Note that the same reference numerals are given to components that perform the same or similar functions in each drawing including FIG. First Embodiment: In a molding device 30 of the present embodiment, as shown in FIG. 1, a fixed resin material 31 fixed in a sprue portion 7.
In order to remove from the sprue portion 7, there are provided a removing member 41 for pushing out the fixed resin material 31 and a supporting member 51 for arranging and supporting the removing member 41 coaxially with the sprue portion 7. The other structure of the molding device 30 is not different from the structure of the molding device 1 described above. Therefore, only the removal member 41 and the support member 51 will be described below. The removing member 41 is a substantially T-shaped rod-shaped member as shown in the drawing, and has a thickness such that it can advance and retreat in a non-contact state with the sprue portion 7. 7 is slightly longer than the overall length. One end 42 of the removing member 41 is
Surface 2c of substantially hemispherical tip 2b of nozzle 2
It has a shape corresponding to the surface 2c so as to be in close contact with the surface 2c. Further, the size of the one end portion 42 is sufficiently larger than the diameter of the injection hole 2a of the nozzle 2 so that an area in contact with the surface 2c can be sufficiently secured. More specifically, the removing member 41 is pressed against the fixing resin material 31 in the sprue portion 7 by the nozzle 2 with a force of about 2 t as in the injection operation, as described later. Is large enough to withstand the pressure. The other end 43 of the removing member 41 has a flat surface cut in a direction perpendicular to the longitudinal direction of the removing member 41 so that the contact area with the fixing resin material 31 is increased.

In this embodiment, the support member 51 can be fitted into the recess 13 of the sprue bush 6. still,
After the fitting, in order to remove the support member 51 from the sprue bush 6, for example, the upper portion 52 of the support member 51 is fitted so as to slightly protrude from the sprue bush 6. The method of removing the support member 51 from the recess 13 is not limited to this, and a method of providing an engagement portion such as a handle on the support member 51, for example, may be considered. Also, as described above, the support member 51
When the support member 51 is fitted in the concave portion 13, the support member 51 supports the removal member 41 so that the rod-shaped removal member 41 extends coaxially with the sprue portion 7. A through hole 53 penetrating the nozzle 2 side and the sprue part 7 side is provided. The removing member 41 is attached to the through hole 53 without loosening with respect to the through hole 53 and movable in the extending direction of the through hole 53.

Further, a support member 55 described below may be used in place of the support member 51. That is, as described above, the sprue portion 7 is
Are arranged on concentric axes. Therefore, utilizing this fact, as shown in FIG.
Has a peripheral surface 56 fitted to the inner peripheral surface 5a, and further has a through hole 57. The through hole 57 is a hole that penetrates the nozzle 2 side and the sprue portion 7 side of the support member 55 similarly to the through hole 53, and the peripheral surface 56 of the support member 55 is formed on the inner peripheral surface 5 a of the localization ring 5. When the fitting is performed, the removing member 41 is supported so that the bar-shaped removing member 41 extends coaxially with the sprue portion 7. The removing member 41
Is attached to the through hole 57 in a state where it is not loosened with respect to the through hole 57 and is movable in the extending direction of the through hole 57. In this case, the support member 55 does not need to be fitted in the recess 13.

The operation of the molding apparatus 30 configured as described above will be described below. As shown in FIG. 6, in step (indicated by “S” in the figure) 1, a molded body is molded by the molding device 30 in the same manner as in the related art. It is assumed that a resin material for molding remains in the sprue portion 7 by the molding operation, and the residual resin material solidifies in the sprue portion 7 and is fixed in the sprue portion 7. If such a sticking occurs, in step 2, for example, the support member 51 is fitted into the recess 13 of the sprue bush 6 and the one end 4
2 is inserted into the through hole 53 of the support member 51 so as to be disposed on the nozzle 2 side. The operation of inserting the removing member 41 into the through hole 53 may be performed after the support member 51 is fitted into the concave portion 13, or the removing member 41 may be inserted into the through hole 53 before the fitting. You may keep it. By fitting the supporting member 51 into the recess 13 and inserting the removing member 41 into the through hole 53 in this manner, the removing member 41 extends coaxially with the sprue portion 7. When the support member 55 is used instead of the support member 51, the peripheral surface 56 of the support member 55 is
And the removing member 41 is inserted into the through hole 57 of the supporting member 55 in the same manner as the supporting member 51. Note that, similarly to the case of the support member 51, the operation of fitting the support member 55 to the inner peripheral surface 5a and the operation of inserting the removal member 41 into the through hole 57 do not matter in time.
Further, the support member 55 is fitted to the inner peripheral surface 5a in this manner,
And by inserting the removing member 41 into the through hole 57,
As in the case of the support member 51, the removing member 41 extends coaxially with the sprue portion 7.

In step 3, the nozzle 2 is moved to the sprue portion 7 side in the direction of arrow 32 as in the case of the normal molding operation. By such a movement of the nozzle 2, the tip 2 b of the nozzle 2 comes into contact with one end 42 of the removing member 41, and then the removing member 41 comes into contact with the through hole 53 of the support member 51 or the through hole 57 of the support member 55. While being supported, the nozzle 2 moves in the direction of the arrow 32 and the arrow 32
The other end 43 of the removing member 41 contacts the fixing resin material 31 in the sprue portion 7. Therefore, the pressing force of the nozzle 2 of about 2 t / cm ² is applied to the fixed resin material 31 by the corresponding contact through the removing member 41 by the arrow 32
Acts in the direction. Accordingly, in step 4, the fixing resin material 31 is pushed out of the sprue portion 7 to the outside of the sprue bush 6 by further moving the nozzle 2 in the direction of the arrow 32.

As described above, the supporting member 51 or the supporting member 55
Is used, the removing member 41 is disposed in a non-contact state and concentric with the sprue portion 7, so that even if the removing member 41 enters the sprue portion 7, the sprue portion 7 is damaged. Thus, the resin material 31 fixed in the sprue portion 7 can be pushed out of the sprue portion 7 to the outside. In the present embodiment, as described above, the fixed resin material 31 is moved by using the movement of the nozzle 2 in the normal molding operation.
The removal of the fixed resin material 31 does not require any special device to remove the fixed resin material 31, and the work of removing the fixed resin material 31 can be easily performed.

In this embodiment, the removing member 41 is a brass metal rod, but may be other metal material.
Also, it may be a resin. In the above description, the removing member 41 is moved in the direction of the arrow 32 by the nozzle 2, but the removing member 41 inserted through the through hole 53 or the through hole 57 is moved by the operator in the direction of the arrow 32 using a hammer or the like. May be.

Second embodiment: molding apparatus 33 of the present embodiment
3, a support member 61 attached to the movable mold 9 and a removing member 71 erected on the support member 61 for pulling out the fixed resin material 31 from the inside of the sprue portion 7 are provided. . As will be described later in detail, the fixing resin material 31 is removed from the sprue portion 7 together with the removing member 71 by being pulled out after the removing member 71 is inserted. The other structure of the molding device 33 is not different from the structure of the molding device 1 described above. Therefore, hereinafter, the supporting member 61 and the removing member 7 will be described.
Only 1 will be described.

The support member 61 has an upper plate portion 62 disposed on the contact surface 9a of the movable mold 9 which comes into contact with the fixed mold 4.
And a claw portion 63 protruding from the upper plate portion 62 along the side surface 9b of the movable-side mold 9 to form a structure integrally formed. On the surface 62a of the upper plate portion 62, a removing member 71 projecting toward the sprue portion 7 is provided upright. Further, as described later, it is necessary to remove the fixed resin material 31 from the sprue portion 7 with the removing member 71 with the movement of the movable mold 9 so that the support member 61 does not come off from the movable mold 9 at that time. The claw portion 63 has an engaging portion that engages with an engaging concave portion 9c having a concave cross section formed on the side surface 9b of the movable mold 9 when the upper plate portion 62 is placed on the contact surface 9a. 64 are formed. Note that the relationship between the concave and convex portions of the engaging concave portion 9c and the locking portion 64 is not limited to the above, and a convex portion is formed on the movable mold 9 and a concave portion is formed on the claw portion 63, contrary to the illustration. Is also good. Also, the shapes of the engaging recess 9c and the locking portion 64 are not limited to those shown in the drawing, and when the fixed resin material 31 is pulled out from the sprue portion 7 as described above, the movable die 9
Can be adopted so that the support member 61 does not easily come off. Furthermore, the upper plate 6
It is also possible to adopt a structure in which the movable mold 2 is detachably supported on the contact surface 9 a of the movable mold 9. When the support member 61 is attached to the contact surface 9a of the movable mold 9 in this way, the removing member 71 is arranged concentrically with the sprue portion 7.

As shown, the removing member 71 has a rod-like shape, and its thickness is large enough to be able to advance and retreat without contacting the sprue portion 7. Also, one end 72 of the removing member 71 located on the entrance side to the sprue 7
May have a tapered shape as shown in the figure, or as shown in FIGS. 4 and 5, for example, as shown in FIGS.
May be provided. The removing member 71 of the present embodiment includes the removing member 71 and the fixing resin material such that the fixing resin material 31 is pulled out from the sprue portion 7 together with the removing member 71 when the fixing resin material 31 is pulled out from the sprue portion 7 as described above. It is necessary to improve the adhesion to the base member 31. Also, it is necessary to facilitate the insertion into the fixed resin material 31. Therefore, the removing member 71 of the present embodiment includes:
A heater 73 capable of heating the removing member 71 to a temperature equal to or higher than the glass transition point of the fixing resin material 31 is incorporated. The heater 73 is supplied with electric power and temperature controlled by a controller 74 via a conductor 75. The method for heating the removing member 71 is not limited to the method using electric resistance as in the heater 73, but may employ a method such as a burner or electromagnetic induction. When heating is to be performed quickly, heating by electromagnetic induction is preferable. When the removal member 71 is heated by the heater 73 or electromagnetic induction, the heating can be performed before or after the support member 61 is attached to the movable die 9, but the heating is performed by a burner. In this case, it is preferable to heat the removing member 71 before attaching the support member 61 to the movable mold 9.

The operation of the molding apparatus 33 thus configured will be described below. As shown in FIG. 7, in step 11, the molding is performed by the molding device 33 in the same manner as in the related art. It is assumed that a resin material for molding remains in the sprue portion 7 by the molding operation, and the residual resin material solidifies in the sprue portion 7 and is fixed in the sprue portion 7. If such sticking occurs, in step 12, the fixed mold 4
The movable mold 9 is opened in the direction of arrow 34 so as to release the mold clamping state. Then, the support member 61 is placed on the contact surface 9a of the movable mold 9 and the engaging concave portion 9c of the movable mold 9 and the locking portion 64 of the claw 63 are engaged with each other, so that the movable The support member 61 is fixed to the contact surface 9 a of the mold 9. The removal member 72 erected on the support member 61 by the fixing extends coaxially with the sprue portion 7. Next, in step 13, the heater 73 of the removing member 71 is heated by the controller 74 to heat the removing member 71 to a temperature equal to or higher than the glass transition point of the fixed resin material 31.

After the heating, at step 14, the movable mold 9 is moved to the fixed mold 4 in the direction of arrow 35 in the same manner as in the case of the mold clamping in the normal molding operation. Accordingly, the heated removing member 71 is pushed into the fixed resin material 31 by the clamping force while melting the fixed resin material 31. The heating is completed at the time when the mold clamping is completed or immediately before the mold clamping is started. Therefore, in Step 15, the fixed resin material 31 melted near the removing member 71 is re-solidified,
It is fixed to the removing member 71. In order to effectively perform the fixing, a needle-like removing member 71 as shown in FIG.
Fine irregularities may be formed on the surface of. After the resin material is fixed to the removing member 71, in Step 16, the movable mold 9 is moved in the direction of the arrow 34 so as to release the clamped state with the fixed mold 4. Therefore, since the removing member 71 moves in the direction of the arrow 34 together with the movable mold 9, the fixed resin material 31 fixed to the removing member 71 is pulled out of the sprue portion 7 to the outside of the fixed mold 4.

By using the supporting member 61, the removing member 71 is arranged in a state of non-contact with the sprue portion 7 and concentrically, so that the removing member 71 enters the sprue portion 7. Even if the sprue portion 7 is not damaged, the resin material 31 fixed in the sprue portion 7 can be pulled out from the sprue portion 7. Also in this embodiment, as described above, the movable mold 9 in the normal molding operation is used.
Since the fixed resin material 31 is removed using the moving operation of the fixing resin material 31, it is not necessary to separately provide a special device for removing the fixed resin material 31, and the work of removing the fixed resin material 31 can be easily performed. .

In the present embodiment, the support member 61 is fixed to the movable die 9, but the member 71 may be removed from a reference point of another member and arranged coaxially with the sprue portion 7. . When the removing member 71 is induction-heated, the entirety of the removing member 71 cannot be made of resin. However, by disposing a resin or a metal that does not damage the mold on the surface of the removing member 71, A heating method can be implemented. When a resin is disposed on the surface of the removing member 71, it is desirable not to perform heating by a burner.

In the above-described first and second embodiments, a so-called vertical molding device in which the nozzle 2 moves up and down in the direction of gravity is taken as an example, but the invention is not limited to the vertical molding device. Further, the support members 51, 55, and 61 only need to be configured to perform the function of arranging the removing members 41 and 71 concentrically with the sprue portion 7. As long as the above function is achieved, the support members 51, 55, and 61 are not necessarily recessed. It is not necessary to perform fitting to the inner peripheral surface 5 a and fixing to the movable mold 9.

[0023]

As described above in detail, according to the molding apparatus of the first aspect of the present invention and the method of removing the fixed resin material of the second and third aspects of the present invention, the removing member is removed from the sprue portion by the support member. Since it is arranged coaxially and can advance and retreat into the sprue portion, the resin fixed in the sprue portion can be removed without damaging the mold. Furthermore,
Since the advancing and retreating operation of the removing member is performed by moving the nozzle and the mold in a normal molding operation, there is no need to provide a special device, and the resin fixed in the sprue portion is easily removed without damaging the mold. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a molding device according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing another example of the structure of the molding apparatus shown in FIG.

FIG. 3 is a cross-sectional view illustrating a structure of a molding device according to the first embodiment of the present invention.

FIG. 4 is a view showing another embodiment of the removing member shown in FIG. 3;

FIG. 5 is a view showing another form of the removing member shown in FIG. 3;

FIG. 6 is a flowchart showing a flow of an operation of the molding apparatus shown in FIGS. 1 and 2;

7 is a flowchart showing a flow of the operation of the molding apparatus shown in FIG.

FIG. 8 is a sectional view showing the structure of a conventional molding apparatus.

[Explanation of symbols]

2 ... Nozzle, 6 ... Sprue bush, 6b ... Contact surface, 7
... Sprue part, 9 ... Movable mold, 12 ... Void part, 13 ...
Recess, 30 molding device, 31 fixed resin material, 33 molding device, 41 removal member, 42 one end, 43 other end, 51 support member, 53 through hole, 55 support member,
56: peripheral surface, 57: through hole, 61: support member, 71: removing member.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Aburaya 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Kazutaka Kawaguchi 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] A nozzle (2) for injecting a resin material for molding a molded body in a cavity (12) provided in a mold (9).
And a recess (13) having a contact surface (6b) with which the tip of the nozzle comes into contact by the movement of the nozzle, and the tip comes into contact with the contact surface by the movement of the nozzle, and is ejected from the nozzle. A sprue bush (6) having a sprue portion (7) for guiding the resin material to the gap portion, wherein the sprue portion can enter the sprue portion without being in contact with the sprue portion. The resin material (3
A rod-shaped removing member (41, 71) for removing 1) from the sprue portion; and a supporting member (51, 55, 61) for supporting the removing member coaxially with the sprue portion. A molding apparatus. 2. The support member (51) is detachable from the recess, and is a through hole for the removal member when fitted in the recess, and is coaxial with the sprue portion. 2. The molding apparatus according to claim 1, further comprising a through hole (53) for movably supporting the through hole. 3. When the sprue bush is positioned on a fixed mold (4) by a positioning ring (5) used for centering the mold and the sprue portion, the support member (55) is An attachment portion (56) attached to the positioning ring, and the attachment portion being attached to the positioning ring so that the removal member can be moved in the insertion hole of the removal member and concentric with the sprue portion. The molding device according to claim 1, further comprising a supporting through-hole (57). 4. The removing member (41) has one end (42) capable of abutting on the tip of the nozzle when the nozzle moves to inject the resin material, and injects the resin material. The other end portion (43) that enters the sprue portion by the movement of the nozzle toward the concave portion and abuts on the fixed resin material in the same manner as the movement of the nozzle for performing the above operation. The molding device according to claim 1, wherein the fixed resin material is extruded from the sprue portion. 5. When the mold (9) is movable, the support member (61) is detachable from the movable mold, and the removing member (71) is erected on the support member. By attaching the support member to the movable mold, the support member is arranged concentrically with the sprue portion and can enter the sprue portion in a non-contact manner, and moves the movable mold toward the sprue bush. By performing mold clamping, the removal member heated above the glass transition point of the resin material is pushed into the resin material fixed in the sprue portion, and the resin material melted by the heated removal member is re-solidified to form the resin member. After the resin material is fixed to the removing member, the movable resin mold is again moved to the side opposite to the sprue bush to open the mold. Pulled from the molding apparatus according to claim 1. 6. The molding apparatus according to claim 5, wherein said removing member for heating is provided with a built-in heating unit utilizing electric resistance. 7. A nozzle (2) for injecting a resin material for molding a molded body in a cavity (12) provided in a mold (9).
And a recess (13) having a contact surface (6b) with which the tip of the nozzle comes into contact by the movement of the nozzle, and the tip comes into contact with the contact surface by the movement of the nozzle, and is ejected from the nozzle. A sprue bush (6) having a sprue portion (7) for guiding the resin material to the gap portion, the method comprising removing the fixed resin material in the sprue portion, the method comprising: After the molded body is formed, a rod-shaped removing member (4) that can enter the sprue portion without contacting the sprue portion and removes the resin material fixed in the sprue portion from the sprue portion.
1), the supporting members (51, 5)
5) supporting the one end of the removing member in contact with the tip of the nozzle, and moving the nozzle toward the sprue in the same manner as the movement of the nozzle for injecting the resin material. And removing the fixing resin material from the sprue portion by moving the removing member to the sprue portion side coaxially with the sprue portion. 8. A nozzle (2) for injecting a resin material for molding a molded body in a cavity (12) provided in a mold (9).
And a recess (13) having a contact surface (6b) with which the tip of the nozzle comes into contact by the movement of the nozzle, and the tip comes into contact with the contact surface by the movement of the nozzle, and is ejected from the nozzle. A sprue bush (6) having a sprue portion (7) for guiding the resin material to the gap portion, the method comprising removing the fixed resin material in the sprue portion, the method comprising: After the molded body is formed, a rod-shaped removing member (7) which can enter the sprue portion without contacting the sprue portion and removes the resin material fixed in the sprue portion from the sprue portion.
1) is supported on the mold by a support member (61) coaxially with the sprue portion. Before or after the support member is supported by the mold, the removal member is made of the resin material. Heated to the glass transition point or higher, the mold was moved to the sprue bush side, and the mold was clamped to push the removal member into the resin material fixed in the sprue portion and melted by the heated removal member. After the resin material is fixed to the removal member by re-solidification of the resin material, the movable resin mold is moved again to the side opposite to the sprue bush, and the mold resin is opened again. A method for removing a fixed resin material, wherein the resin material is pulled out from a part.