KR101666404B1

KR101666404B1 - Gas exhausting adapter nozzle for injection molding machine

Info

Publication number: KR101666404B1
Application number: KR1020150070140A
Authority: KR
Inventors: 문광필
Original assignee: 문광필
Priority date: 2015-05-20
Filing date: 2015-05-20
Publication date: 2016-10-19

Abstract

The present invention relates to a gas exhausting adapter nozzle for an injector comprising: an inside hollow type nozzle main body (110) including an outer opening (111) located at the center in a longitudinal direction to be penetrated therethrough and a gas discharge hole (112) penetrated along an outer circumference; a gap forming member for discharging gas (120) inserted inside the nozzle main body (110) to be disposed in close contact with an inside wall, and for allowing only gas to flow in through fine gap formation with an inside wall of the nozzle main body (110) according to a location so as to discharge the gas toward the gas discharge hole (112); a connecting member (130) formed to be shifted on the outer opening (111), and assembled with the gap forming member for discharging gas (120); a movement induction member (140) assembled and combined with the connecting member (130), and located outside the nozzle main body (110); and a position movement driving means (150) combined with the movement induction member (140), and for controlling operation with respect to shift of the gap forming member for discharging gas (120). According to the present invention, as the gap forming member for discharging gas (120) inserted inside the nozzle main body (110) is shifted forward and backward in a linear direction, a gap formed on an outer surface of a rear end and a gap for discharging only a gas may be formed between the discharge guide groove (122) and an inside wall having a rear taper part (102) of the nozzle main body (110). Therefore, gas generated by an inlet of a cylinder (10) and a nozzle part may be easily discharged.

Description

{GAS EXHAUSTING ADAPTER NOZZLE FOR INJECTION MOLDING MACHINE}

The present invention relates to a gas discharge adapter nozzle unit for an injection molding machine used for producing a plastic molded product, and more particularly, to a gas discharge adapter nozzle unit for an injection molding machine which is capable of performing gas discharge from a cylinder nozzle portion of an injection molding machine, To a gas discharge adapter nozzle unit for an injector.

In general, injection molding is a molding method in which a synthetic resin molding material is injected into a cylinder of an injection molding machine, heated and melted and molded into a molding die to form a plastic product.

However, during the injection molding operation, there is a problem that gas is generated in the raw material of the molten synthetic resin material during the process of injecting the molding material into the cylinder and molding the molten resin to make an injection product, and the gas generated in the cylinder There is a problem that the molding is filled inside the mold when the injection molding is press-fitted, and thus defects such as appearance defects are generated in the plastic molding product.

In addition, the injection of the raw material of the synthetic resin material melted into the molding die through the injection cylinder and the extrusion screw is referred to as injection, and the extrusion screw rotates in the injection cylinder to dissolve the synthetic resin material as heat by friction and heating, Preparing the desired amount of molten raw material for the next injection is referred to as weighing, and the injected synthetic resin raw material is injected into a molding die and molded into an injection product having a predetermined shape.

At this time, most of the unnecessary gas is generated by the metering which melts the raw material and the continuous heating in the melted state after the metering.

In order to solve this problem, a gas discharging device for injection molding for discharging the generated gas in the cylinder to the outside so as not to fill the gas into the molding die during injection molding is combined with the injection molding machine.

In this case, the conventional gas exhausting apparatus is mostly used for exhausting the gas from the cylinder inlet of the injector to the outside, but it is generated during the process of discharging only the gas generated at the inlet of the cylinder and melting by heating heating Gas is injected into the molding die to reduce the molding efficiency of the molded product due to the presence of gas, and a complicated system such as a separate control unit must be provided and the appearance is not good and there is inconvenience in use.

In recent years, a nozzle type method of injecting a raw material of a synthetic resin material into a molding die side and discharging gas generated from a front side of a cylinder is applied to a nozzle portion which is an exit portion of a cylinder of an injection molding machine. The injection pressure applied to the inside of the injection molding machine may cause damage to parts and damage to the injection molding machine.

Korean Patent Publication No. 10-2012-0044213

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a gas injector for a gas injector, which is capable of performing gas discharge from a cylinder nozzle portion of an injector, Discharge adapter nozzle unit.

The present invention relates to an injection molding machine for injecting synthetic resin molding raw material extruded into a nozzle portion by an extrusion screw in a cylinder of an injection machine so as to be injected into a molding die side while allowing gas generated in the injection machine to be easily discharged from a nozzle portion. And to provide a gas discharge adapter nozzle unit for gas discharge.

The present invention proposes a new configuration having a forward and backward linear movement system instead of a conventional rotation system, and provides a gas discharge adapter nozzle unit for an injector that can open or close a gap for gas discharge according to a moving position. have.

The present invention can improve the structure by the forward and backward linear motion system and prevent the nozzle unit from rotating due to the injection pressure acting inside the injection unit, thereby preventing the nozzle unit from being damaged or damaged, It is an object of the present invention to provide a gas discharge adapter nozzle unit for an injection machine.

In order to attain the above object, the present invention provides an injector (1) including a cylinder (10) having an extrusion screw for extruding a resin molding material,

The cylinder 10 is provided with a position or a rear end connected to the cylinder 10 so as to be connected to the cylinder 10 and has an outer opening 111 passing through a center portion of the cylinder 10 in the longitudinal direction, A nozzle body 110 having a hollow 112 formed therein and having a circular hollow therein; A cylindrical body inserted into the nozzle body 110 and closely disposed on the inner wall of the nozzle body 110. According to the position of the nozzle body 110, only the gas flows through the inner wall of the nozzle body 110 to form a fine gap and is discharged to the gas discharge hole 112 side A gas discharging gap forming member 120 for passing the resin molding raw material flowing from the cylinder 10; A connection member 120 assembled with the gas discharge gap forming member 120 disposed inside the nozzle body through the outer surface opening 111 of the nozzle body 110 and capable of moving back and forth on the outer surface opening 111, (130); A movement inducing member 140 assembled to the connection member 130 and positioned outside the nozzle body 110; And a position movement driving means 150 coupled to the movement inducing member 140 for controlling driving of the gas discharging gap forming member 120 with respect to positional movement.

The inner hollow of the nozzle body 110 includes an inlet 101 connected to the inner hollow of the cylinder 10 and a rear tapered portion 102 whose diameter is reduced and tapered compared to the inlet A gas discharge and resin material passing portion 103 which is a portion where the position of the gas discharge hole 112 and the gas discharge gap forming member 120 are disposed and a gas discharging and resin material passing portion 103 which is smaller in diameter than the gas discharging and resin material passing portion, The tapered part is formed in a structure including a front tapered part (104) and an outflow part (105) enlarged to the same diameter as the inflow part, and is formed sequentially from the rear end to the front side; The gas venting crevice forming member 120 is a cylindrical body 121 disposed on the side of the gas exhausting and resin material passing portion 103. The gas venting crevice forming member 120 has a cylindrical body 121, And a gap forming and discharging guide groove 122 for guiding the formation of the gas and guiding the gas discharge.

Here, the position movement driving means 150 is constituted by a driving motor 151 having a rotation axis 151a; The movement guide member 140 includes a pinion gear 141 coupled to the rotary shaft 151a and a rake-shaped fisher 142a gear-coupled to the pinion gear, And a moving rail 142 coupled to the connecting member 130 to be assembled with the connecting member 120; The driving motor 151 is fixedly mounted so that the movable rail 142 is moved forward and backward in accordance with the rotation of the pinion gear 141 when the rotary shaft 151a is rotationally driven so that the gas- (120) can be controlled in forward and backward directions.

Here, the position movement driving means 150 is constituted by a cylinder 152 having a rod 152a which can be driven by pneumatic pressure or hydraulic pressure; The movement guide member 140 includes a movement bar 143 having one end connected to the rod 152a of the cylinder and the other end connected to the connection member 130 assembled with the gas discharge gap forming member 120 ; The cylinder 152 is fixedly mounted so that the movement bar 143 is moved forward and backward when the rod 152a is driven so that the gas discharge gap forming member 120 can be controlled in forward and backward positions in the nozzle body 110 .

A suction unit 160 is connected to the gas discharge hole 112 of the nozzle body 110 and outputs an output from the control unit 20 of the injector 1 at a metering signal of the injector 1 The gas discharge gap forming member 120 is moved and moved between the gas discharge gap forming member 120 and the inner wall of the nozzle body 110 by operating the position movement driving means 150 and the suction means 160 And the gas generated from the nozzle and the inlet of the cylinder 10 is discharged. In addition, the resin molding material is injected into the molding die through the nozzle body 110.

According to the present invention, there is provided a gas discharge adapter nozzle unit for an injector of a new construction, which is capable of performing gas discharge from a cylinder nozzle portion of an injection machine, It is possible to prevent the nozzle unit from being rotated by the injection pressure acting on the nozzle unit, thereby preventing the nozzle unit from being damaged or damaged, and a useful effect of increasing the service life of the product can be achieved.

The present invention relates to an injection molding machine for molding a synthetic resin molding material which is extruded into a nozzle portion by an extrusion screw in a cylinder of an injection machine so as to be injected into a molding die side while gas generated in the injection machine is injected into a nozzle portion And a gap for discharging the gas can be formed or closed according to the linear movement of the position.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing the configuration of an injection machine including a gas discharge adapter nozzle unit for an injection machine according to an embodiment of the present invention; FIG.
FIG. 2 is a schematic cross-sectional view illustrating a gas discharge adapter nozzle unit for an ejector according to an embodiment of the present invention. FIG.
3 is a cross-sectional view illustrating a gas discharge adapter nozzle unit for an ejector according to an embodiment of the present invention.
4 is a perspective exploded perspective view illustrating a gas discharge adapter nozzle unit for an injector according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view illustrating a gas discharge adapter nozzle unit for an ejector according to another embodiment of the present invention. FIG.
6 is a schematic cross-sectional view of a gas discharge adapter nozzle unit for an injector according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

1 to 6, the gas discharge adapter nozzle unit 100 for an injector according to the embodiment of the present invention includes a cylinder 10 having an extrusion screw for feeding and extruding a resin molding material, 1, the gas generated in the cylinder 10 is discharged to the outside when the resin molding material is supplied to the molding die from the nozzle portion, that is, the front side, rather than the inlet portion (rear side) of the cylinder 10 For example.

The gas exhaust adapter nozzle unit 100 for an injector according to the embodiment of the present invention includes a nozzle body 110, a gas discharge gap forming member 120, a connecting member 130, a movement inducing member 140, And driving means (150).

The nozzle body 110 is formed in a size corresponding to the cylinder 10 of the injector 1 and is connected to the tip end of the cylinder 10 in such a manner that the rear end face thereof is in close contact with the cylinder 10, And can be connected and connected to the cylinder 10 while remaining intact.

The nozzle body 110 may be formed of a cylindrical body having both internal and external portions of a circular shape and may be formed of a cylindrical body having a gear gap formed on an outer surface thereof. 6 angles, 8 angles, and the like).

The nozzle body 110 may be constructed in such a manner that the nozzle body 110 is assembled to the cylinder 10 of the injector 1 or fastened or fitted to the cylinder 10. In the case of the fitting method, It is preferable to form a gear gap or to apply a polygonal structure.

The nozzle body 110 is formed with an outer surface opening 111 which is located at a central portion of the outer surface in the longitudinal direction and penetrates the inner cavity so as to be connected to the inner cavity, 112 are formed.

At this time, one of the outer openings 111 may be formed on one side of the nozzle body 110, or two openings may be formed at positions opposite to each other. The gas discharge hole 112 may be formed in the nozzle body 110 A plurality is disposed and spaced along the outer surface.

The nozzle body 110 includes an inlet portion 101 connected to the inner hollow of the cylinder 10 with respect to the inner hollow portion of the nozzle body 110 and a rear tapered portion A gas discharge and resin material passing portion 103 in which the gas discharge hole 112 is formed and in which the position and the gas discharge gap forming member 120 are inserted and disposed; A front tapered portion 104 which tapers as the diameter of the raw material passing portion 103 decreases and a forward portion of the raw material passing portion 103 and an outlet portion 105 that is enlarged to the same diameter as the inlet portion 101, These are preferably formed in succession from the rear end toward the front in the longitudinal direction.

Here, the rear tapered portion 102 is preferably formed to have a slope having an inclination angle of 5 to 10 degrees with respect to a horizontal plane for efficiency of formation of a gap for gas discharge.

The nozzle body 110 may be a bracket or the like for stable connection or coupling to the cylinder 10 side of the injector.

The gas-discharging gap forming member 120 is inserted into the nozzle body 110 and is disposed in close contact with an inner wall of the nozzle body 110, and is provided with a cylindrical body having an inner hollow.

The gas-discharging gap forming member 120 is formed to have an outer diameter corresponding to the inner diameter of the nozzle body 110 and can be inserted and disposed therein. In the nozzle body 110, .

More specifically, the nozzle body 110 is configured to be able to discharge the gas and to slide in the diameter and the left and right directions corresponding to the resin material passing portion 103.

Here, the gas-discharging gap forming member 120 may be formed by forming a minute gap between the gas-discharging gap forming member 120 and the inner wall of the nozzle body 110 according to the arrangement position of the gas- So that the resin molding material introduced from the cylinder 10 can be injected into the molding die through the inner hollow. The resin molding material can be injected into the molding cavity .

That is, the gas-discharging gap forming member 120 is a cylindrical body 121 disposed on the side of the gas-discharging and resin material passing portion 103 of the nozzle body 110, and the rear end of the cylindrical body 121 And a gap forming and discharging guide groove 122 for guiding the formation of a gas discharging gap and guiding the gas discharging around the outer surface.

The gas venting gap forming member 120 has a rear tapered portion 122 whose diameter gradually decreases toward the front end in order to smoothly flow and flow the molding material through the inner hollow thereof And a front enlarged diameter portion 123 having a gradually increasing diameter toward the forward direction is formed at the distal end portion.

The gas-discharging gap forming member 120 has an assembly groove 124 formed at a central portion of the outer surface thereof for assembling with the connecting member 130. The gas-discharging gap forming member 120 has an opening corresponding to the opening 111 of the nozzle body 110 Position and the number of holes.

At this time, it is preferable that the assembly groove 124 is formed with threads so as to be screwed.

The connecting member 130 is assembled with the gas discharging gap forming member 120 disposed inside the nozzle body through the outer surface opening 111 of the nozzle body 110, So as to be movable.

That is, the connection member 130 is an assembly block in which one end of the connection member 130 is screwed into the assembly groove 124 of the gas discharge gap forming member 120 and the other end of the connection member 130 is exposed to the outside of the nozzle body 110 Respectively.

At this time, the connecting member 130 is provided at its other end with an assembly groove having a thread for assembling with the movement inducing member 140.

The movement guide member 140 is positioned outside the nozzle body 110 and has one end connected to the connection member 130 and the other end coupled to the position movement driving means 150.

The movement guide member 140 and the linking member 130 may be integrally formed with one another or may be provided in one or both directions. .

Here, the movement guide member 140 may be configured differently according to the installation type of the position movement driving means 150, which will be described in detail below.

The position movement driving means 150 is coupled to the movement guide member 140 and is configured to move the movement guide member 140 to control driving of the gas release gap formation member 120 to be.

Here, when the movement guide member 140 is disposed on both sides of the movement guide member 140, the position movement drive unit 150 may be connected to the movement guide member 140, and may be integrated to control the movement of the movement guide member 140 in one direction. Can be configured to be positioned.

In this case, the position movement driving means 150 may be composed of a driving motor 151 having a rotation axis 151a, which is fixedly mounted on the cylinder 10 side by using a bracket or the like, Can be changed.

Accordingly, the movement guide member 140 includes a pinion gear 141 coupled to the rotation shaft 151a, and a rake-shaped gear 142a gear-coupled to the pinion gear 141, And a moving rail 142 coupled to the connecting member 130 to be assembled with the discharging gap forming member 120.

Here, when the driving motor 151 is operated to rotate the rotary shaft 151a, the moving rail 142 is moved forward and backward according to the rotation of the pinion gear 141, and is disposed in the nozzle body 110 It is possible to control the forward and backward positions of the gap forming member 120 for gas discharge.

The position movement driving means 150 may be composed of a cylinder 152 having a rod 152a which can be pneumatically or hydraulically driven, and is fixedly mounted on the cylinder 10 side using a bracket or the like.

The movement guide member 140 includes a movable bar 143 coupled to the connection member 130, one end of which is connected to the rod 152a of the cylinder and the other end of which is coupled to the gas- ).

Here, when the rod 152a of the cylinder 152 is driven by providing the air pressure or the hydraulic pressure, the movable bar 143 is moved back and forth in accordance with the forward and backward driving of the rod 152a, It is possible to control the forward and backward positions of the disposed gas-discharging gap forming members 120 in the nozzle body 110.

A suction means 160 for discharging a gas such as a vacuum pump is connected to the gas discharge hole 112 of the nozzle body 110. The suction means 160 and the position movement driving means 150 are connected to the gas discharge hole 112 of the injector 160, It is possible to control the driving in accordance with the output of the control unit 20 that controls the driving unit 1.

At this time, when the resin molding material is injected from the cylinder 10 into the molding die, it is most preferable and efficient to discharge the gas generated in the cylinder 10 during the metering process in the injector 1, The position movement driving means 150 and the suction means 160 can be operated at the same time through the output of the control unit 20 which controls the overall operation of the apparatus.

The operation of the gas discharge adapter nozzle unit 100 for an injector and the principle of gas discharge according to the present invention having the above-described structure will be described as follows.

The resin molding material is injected into the inlet of the cylinder 10 and extruded through the extrusion screw to the nozzle portion of the cylinder.

In addition, by operating the heater, the resin molding material in the cylinder 10 of the injection machine is metered by the shear force of friction and the heat by heating, and melted in a desired amount for the next injection.

This is accomplished by signal output from the control unit 20 of the injector 1. When the control unit 20 outputs a weighing signal, the position shift driving unit 150 is operated together with the suction unit 160. [

Since the suction means 160 is connected to the gas discharge hole 112 formed in the nozzle body 110 to provide suction power in the gas discharge hole 112, The movement guide member 140 is moved backward to a predetermined position so that the gas discharge gap forming member 120 disposed inside the nozzle body 110 is moved backward.

In the case where the position movement driving means 150 is constituted by the driving motor 151, the rotation shaft 151a of the driving motor 151 rotates so that the pinion gear 141 of the movement inducing member 140, And the rake-shaped fisher portion 142a, which is gear-engaged with the rotation of the pinion gear 141, is moved backward to move the movable rail 142 backward, whereby the gas-discharging crevice-forming member 120 is moved backward A gap is formed between the inner wall of the nozzle body 110 and the rear end of the gas discharging gap forming member 120 to enable gas discharge.

Here, when the position movement driving means 150 is constituted by the cylinder 152, the rod 152a of the cylinder 152 is moved backward to move the movement bar 143 of the movement inducing member 140 backward, A gap is formed between the inner wall of the nozzle body 110 and the rear end of the gas discharging gap forming member 120 to allow gas to escape as the gas discharging gap forming member 120 is moved backward.

That is, by the inclined structure of the rear tapered portion 102 formed on the nozzle body 110 and the recessed groove structure formed on the outer surface of the gas discharge gap forming member 120 and recessed in the discharge guide groove 122 So that only the gas generated in the cylinder 10 is sucked through the gap and the gas is discharged to the gas discharge hole 112 of the nozzle body 110 to the outside of the guide and the nozzle unit 100 do.

Accordingly, according to the present invention, the gas-discharging gap forming member 120 arranged to be inserted into the nozzle body 110 and movable forward and backward is moved in the linear direction, A gap is formed between the rear end of the gas discharging gap forming member 120 and the inner wall of the nozzle body 110, particularly, the inner wall having the rear tapered portion 102 to allow gas discharge only, The resin molding material to be injected and weighed can be injected into the molding die through the inner hollow of the gas discharging gap forming member 120.

On the other hand, when the position movement driving means 150 is driven in the reverse direction when the weighing signal is canceled in the injector 1, the movement inducing member 140 is advanced and arranged in the reverse state, The rear end of the gas discharging gap forming member 120 is positioned at the rear tapered portion 102 of the nozzle body 110 to discharge the gas and to position the resin raw material passing portion 103 The gap for gas discharge is closed.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Modifications or substitutions may be made.

1: Injector 10: Cylinder
20: Control unit 100: Gas discharge adapter nozzle unit
110: nozzle body 111: outer surface opening
112: gas discharging hole 120: gas discharging gap forming member
122: crevice forming and discharging guide groove 130: connecting member
140: movement guide member 141: pinion gear
142: moving rail 142a: rake-size fisher
143: movement bar 150: position movement drive means
151: drive motor 152: cylinder

Claims

An injection molding machine (1) comprising a cylinder (10) having an extrusion screw for extruding a resin molding material,
The cylinder 10 is provided with a position or a rear end connected to the cylinder 10 so as to be connected to the cylinder 10 and has an outer opening 111 passing through a center portion of the cylinder 10 in the longitudinal direction, A nozzle body 110 having a hollow 112 formed therein and having a circular hollow therein;
A cylindrical body inserted into the nozzle body 110 and closely disposed on the inner wall of the nozzle body 110. According to the position of the nozzle body 110, only the gas flows through the inner wall of the nozzle body 110 to form a fine gap and is discharged to the gas discharge hole 112 side A gas discharging gap forming member 120 for passing the resin molding raw material flowing from the cylinder 10;
A connection member 120 assembled with the gas discharge gap forming member 120 disposed inside the nozzle body through the outer surface opening 111 of the nozzle body 110 and capable of moving back and forth on the outer surface opening 111, (130);
A movement inducing member 140 assembled to the connection member 130 and positioned outside the nozzle body 110;
A position movement driving means (150) coupled to the movement inducing member (140) for controlling driving of the gas discharging gap forming member (120) for position movement; Wherein the gas outlet adapter nozzle unit for the injector comprises:

The method according to claim 1,
The inner hollow of the nozzle body (110)
A rear tapered portion 102 whose diameter is reduced and tapered relative to the inflow portion and a rear tapered portion 102 which is formed at a position of the gas discharge hole 112 and a gap for gas discharge A gas discharge and resin material passing portion 103 where the forming member 120 is disposed, a front tapered portion 104 whose diameter is reduced and tapered compared to the gas discharge and resin material passing portion, And an outflow section (105) extending to the same diameter, wherein the plurality of outlets are sequentially formed from a rear end to a front end;
The gas-discharging gap forming member (120)
A cylindrical body 121 disposed on the side of the gas discharge and resin material passing portion 103,
And a gap forming and discharging guide groove (122) for guiding the formation of a gas discharging gap and guiding gas discharging is formed around the outer surface of the rear end of the cylindrical body (121) Nozzle unit.

The method according to claim 1,
The position movement driving means (150)
And a drive motor 151 having a rotary shaft 151a;
The movement guide member (140)
A pinion gear 141 coupled to the rotating shaft 151a and a connecting member 142 having one end connected to the pinion gear 142 to be engaged with the pinion gear and the other end connected to the gas discharging gap forming member 120 130; < / RTI >
The driving motor 151 is fixedly mounted so that the movable rail 142 is moved forward and backward in accordance with the rotation of the pinion gear 141 when the rotary shaft 151a is rotationally driven so that the gas- (120) can be controlled in the forward and backward position.

The method according to claim 1,
The position movement driving means (150)
And a cylinder 152 having a rod 152a which can be pneumatically or hydraulically driven;
The movement guide member (140)
And a moving bar 143 coupled to the connecting member 130, one end of which is connected to the rod 152a of the cylinder and the other end is connected to the gas discharging gap forming member 120;
The cylinder 152 is fixedly mounted so that the movement bar 143 is moved forward and backward when the rod 152a is driven so that the gas discharge gap forming member 120 can be controlled in forward and backward positions in the nozzle body 110 Wherein the gas outlet adapter nozzle unit for the injector is configured to form the gas outlet adapter nozzle unit.

The method according to claim 1,
Suction means 160 is connected to the gas discharge hole 112 of the nozzle body 110,
At the weighing signal in the injector 1,
The position shifting driving means 150 and the suction means 160 are actuated through the output of the control unit 20 of the injector 1 to move the gas discharging crevice forming member 120 to the gas discharging gap A gas discharge gap is formed between the forming member 120 and the inner wall of the nozzle body 110 and the gas generated at the inlet and the nozzle portion of the cylinder 10 is discharged and the resin molding material is supplied through the nozzle body 110 And injecting the mixture into a molding die.