JPH0976286A - Two material composite molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure without necessitating any high accuracy in the accuracy of parts by a method wherein a 2-material, composite molding device is constituted of a composite structure wherein an injection molding unit, consisting of an injection screw, and a screw extruding unit, consisting of an extruding cylinder, are arranged concentrically. SOLUTION: An injection screw 51 is retreated while being turned and a given amount of molten first resin material A, extruded forwardly by the rotation of the injection screw 51, is reserved in a filling unit before the tip end unit 51a of the injection screw 51. Subsequently, the injection screw 51 is advanced forward to inject while the first resin material A, injected out of the filling unit, enters the cavity 35 of a mold through an injection nozzle 41a and an extruding nozzle 36a. Subsequently, the rotation of the injection cylinder 41 and the injection screw 51 is stopped. When the first resin material A, injected into the cavity 35 of a mold, is cooled a little and the viscosity of the first resin material A is increased, the injection cylinder 41 and the injection screw 51 are turned with the same number of rotation to fill the cavity 35 of the mold with a second resin material B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-material composite molding apparatus for molding a composite molded article by using a plurality of resin raw materials of different colors or different types.

[0002]

2. Description of the Related Art Conventionally, in a two-material composite molding apparatus for molding a composite molded article using two colors or two or more kinds of resin raw materials, the injection resin passages at the tips of a plurality of injection units are joined to each other. It is common to inject resin from the injection nozzle of the above into the mold at the same time or separately from each injection unit to perform composite molding, and as an injection molding nozzle equipped in such an injection molding apparatus, , Various proposals have been made.

As an example thereof, there is a utility model No. 2-10915 "injection molding nozzle" proposed by the applicant of the present invention as shown in FIG.

In the figure, A is a first injection unit and B is a second injection unit, which are constructed so that different resin raw materials can be plasticized and melted and injected into a mold. That is, the inner cylinder nozzle 8 configured to open and close the needle is attached to the tip of the heating cylinder 7 of the second injection unit B, and the inner cylinder nozzle 8 is concentrically provided with the inner cylinder nozzle 8. , The front is slidably fitted. The resin supply pipe 10 of the outer cylinder nozzle 9 and the tip of the heating cylinder 11 of the first injection unit A are connected via a connecting pipe 12.

The inner cylinder nozzle 8 and the second injection unit B can be moved in the front-rear direction (the left-right direction in the drawing) by a hydraulic cylinder (not shown), and the outer cylinder nozzle 9 can be moved in the first injection unit. In addition to A, it can be moved by a hydraulic cylinder (not shown) different from the above hydraulic cylinder, and each can independently perform a nozzle touch operation. Between the inner hole portion 15 of the outer cylinder nozzle 9 and the outer peripheral surface of the extended inner cylinder portion 16 of the inner cylinder nozzle 8 slidably fitted in the outer cylinder 9, the skin side resin passage 17 is provided.
Are formed.

An injection port 1 provided at the tip of the outer cylinder nozzle 9.
A valve seat 19 is provided on the inner side of the valve seat 8.
In addition, a valve mechanism is configured to shut off the skin resin passage 17 with the outer peripheral surface of the distal end portion of the extended inner cylinder portion 16 of the inner cylinder nozzle 8. The inner cylinder nozzle 8 is configured as a needle opening / closing type as described above, and by the first injection unit A,
Since the injection pressure applied to the resin raw material 25 is applied to the area of the diameter a of the injection port 23 of the inner cylinder nozzle 8, the force of the spring 22 that presses the needle valve 20 against the injection port 23 has a capacity higher than that. At the same time, due to the injection pressure applied to the second resin raw material 26 by the second injection unit B, the needle valve 20 overcomes the force of the spring 22 and retreats,
The ratio between the diameter a of the injection port 23 and the diameter D of the needle valve 20 is properly selected so that the injection port 23 is opened.

The injection molding nozzle proposed by the applicant of the present invention is constructed as described above, and has the injection port 18 for injecting the first resin raw material 25 into the mold and the injection port 23 for injecting the second resin raw material. Since the valve seat 19 is brought into contact with the outer peripheral surface of the distal end of the extended inner cylinder portion 16, and the valve mechanism is brought into contact with the outer peripheral surface of the needle valve 20 at the injection port 23, the valve mechanism is provided with each other. There is no restriction that the injection time and the measurement time interfere with each other.

[0008] Further, each resin raw material can be separately injected or by freely adjusting the valve mechanism, both resin raw materials can be injected at the same time, a molded product without turbidity, and various types in which the mixing ratio is freely changed. The molded product can be obtained efficiently. Further, since these valve mechanisms are independently provided close to the injection ports 18 and 23, respectively, the amount of the resin raw material remaining in the vicinity of the injection ports 18 and 23 is not separated from each other. It has an advantage that it can be extremely reduced, unnecessary turbidity is avoided, and a uniform molded product can be molded.

However, in the above injection molding nozzle, the extended inner cylinder portion 16 (the inner cylinder nozzle 8) forming one nozzle 23 constitutes the valve mechanism of the other resin passage,
A valve mechanism by the needle valve 20 is also provided in the other resin material injection passage, but since this portion is exposed to high temperature, thermal distortion is likely to occur and component accuracy is ensured. It is difficult to perform, the structure is complicated, the manufacturing is difficult and the cost is high, and the disassembly and cleaning are troublesome. Also, resin materials that are difficult to inject, such as long-fiber glass-containing resin materials and waste plastic materials,
It cannot be used for the molding of molded products centered on.

Further, since the injection units A and B must be separately provided and different resin raw materials must be supplied from the respective injection units, the installation area of the injection molding machine becomes large and the space efficiency becomes poor. is there.

[0011]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional two-material composite molding apparatus, so that it is not necessary to make the parts precision high, the structure is simple, the cost is low, and the installation is low. It is an object of the present invention to provide a two-material composite molding apparatus that can occupy a small area and that can easily injection-mold resin raw materials that have been difficult to perform injection processing, can reduce injection pressure, and can reduce the size of structural members. To do.

[0012]

Therefore, the two-material composite molding apparatus of the present invention has the following means.

(1) A unit base is provided which is slidable on a rail or the like provided on a molding apparatus main body fixed to the ground so as to be movable in the front-rear direction.

(2) The following a to d are provided, and an extrusion cylinder having an internal compartment for accommodating the injection cylinder in the axial direction is fixedly attached to the unit base. a. An extrusion nozzle provided at the tip to inject the kneaded and plasticized resin material into the mold connected to the front. b. A gear chamber that is internally divided at the rear end to accommodate the gears. c. A thrust bearing provided on the inner peripheral side of the lid that closes the rear end of the internal compartment in order to freely rotate the injection cylinder and support the front and rear parts by restraining them. d. A second hopper provided on the outer periphery where a second resin material supply passage formed in the radial direction opens so as to supply the second resin material to the inner compartment.

(3) An internal section for accommodating an injection screw is provided in the inside in the axial direction from the front end to the rear end, and an injection nozzle is provided at the front end so as to be rotatable in the internal section of the extrusion cylinder. A gear is fixedly provided on the outer peripheral surface of the portion that is housed up to the rear end and passes through the gear chamber of the extrusion cylinder,
The portion protruding rearward from the rear end of the extrusion cylinder is supported by the thrust bearing of the extrusion cylinder, and the second resin raw material supplied from the second hopper of the extrusion cylinder is kneaded and plasticized to be pushed from the extrusion nozzle. An injection cylinder is provided in which the second extrusion screw is formed on the outer peripheral surface of which the second extrusion screw is located in front of the gear chamber.

(4) A second rotating means is provided in the vicinity of the gear chamber and drives the gear to rotate the injection cylinder.

(5) In the inner section of the injection cylinder, turn,
A drive unit is provided at a rear end portion which is housed so as to be movable back and forth and extended rearward from a rear end of the injection cylinder, and is supplied from a first hopper of a bearing stand provided in front of the drive unit. An injection screw having a first extruding screw formed on the outer peripheral surface, which kneads and plasticizes one resin raw material and extrudes it from an injection nozzle at the tip of the injection cylinder, which is provided in front of the tip, is provided.

(6) Fixed to the rear end of the injection screw,
A drive unit including a first rotating unit that rotates the injection screw and a moving unit that linearly moves the injection screw in the axial direction, that is, moves back and forth is provided.

(7) A bearing, which is arranged between the extrusion cylinder and the drive unit and supports the rear end of the injection cylinder protruding rearward from the thrust bearing of the extrusion cylinder, is provided at the front end portion, and the rear end of the injection cylinder is provided. To the rear end of the first extrusion screw provided on the outer peripheral surface of the injection screw extending through the inside of the injection screw and extending to the drive unit and halfway through the through-hole. Was set up,
A bearing stand having a first hopper was provided on the outer periphery where the first resin material supply passage was opened.

According to the two-material composite molding apparatus of the present invention, by means of the above-mentioned means, the resin inlet of the clamped mold of the injection molding machine is
The nozzle opening of the extrusion cylinder is pressed, and the resin raw materials inside the extrusion cylinder and the injection cylinder are heated, sufficiently kneaded and plasticized by the rotation of the injection cylinder and the rotation of the injection screw, and the conditions for extrusion and injection are set. In the full state, the following actions take place.

(1) The injection screw retreats while rotating, and a fixed amount of the molten first resin raw material transferred forward by this rotation is accumulated at the tip of the injection screw. Next, the injection screw is moved forward by the moving means for injection, and the first resin raw material passes through the injection nozzle and the extrusion nozzle,
It is injected into the mold cavity. At this time, the injection cylinder is rotated slowly, and the injection screw is also rotated at the same number of rotations so that the rotation difference between the two is relatively zero. The reason for rotating this injection cylinder is to make the extrusion pressure on the extrusion cylinder side equal to the injection pressure inside the injection cylinder so that the first resin raw material on the injection side does not enter into the resin passage on the extrusion cylinder side. Is. Since the first resin raw material melted in this state is injected into the mold and is filled only near the mold entrance,
The injection pressure at this time may be low.

(2) Next, the rotations of the injection cylinder and the injection screw are stopped, and the injection screw is slightly retracted for suck back. When the first resin material injected into the mold has cooled slightly and the resin temperature has dropped and the viscosity has increased, the injection cylinder and the injection screw are rotated at the same rotation speed, that is, the first cylinder inside the injection cylinder. In the first resin material, the molten second resin raw material is extruded from the extrusion cylinder side while preventing the injection pressure from being generated, and is pushed into the inside of the first resin material filled in the inlet portion of the mold, The resin raw material is expanded and filled into the mold. After the filling, the injection cylinder and the injection screw are kept rotating for some time while the extrusion pressure is applied to solidify the resin. In this way, a composite resin molded product having the first resin raw material as a skin and the second resin raw material filled inside is molded in the mold.

(3) Next, the injection cylinder and the injection screw are slightly rotated in the opposite directions at the same number of revolutions to suck back the molten second resin raw material remaining in the resin passage on the extrusion cylinder side.

(4) Finally, the mold is opened, the molded product is taken out, the mold is clamped again, the process returns to the first step (1), and each step is repeated.

Therefore, the two-material composite molding apparatus of the present invention has two
When injecting one of the material resins, a valve mechanism that blocks the other resin passage, is exposed to high temperatures, is prone to thermal distortion, requires precision in parts, is expensive, and has a complicated structure. It can be unnecessary. Further, since the valve mechanism is not required, it becomes possible to mold a molded product mainly made of a resin material that is difficult to inject, that is, a resin material containing long fiber gas, a waste plastic material, or the like. further,
Since the injection cylinder and the injection screw that individually inject a plurality of materials are coaxially arranged, the installation area of the injection molding machine can be reduced and the space efficiency can be increased.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a two-material injection molding apparatus of the present invention will be described with reference to the drawings. 1 is a side sectional view showing a first embodiment of a two-material injection molding apparatus of the present invention,
FIG. 2 is a bird's-eye view around the drive mechanism of the injection screw and the extrusion screw of the embodiment shown in FIG. 1, and FIG. 3 shows two types of resin injected into the cavity of the mold of the embodiment shown in FIG. FIG. 4 is a block diagram showing each operation step of the embodiment shown in FIG. 1, and shows each screw rotation speed in the same step, which shows the operation of extrusion. The two-material composite molding device has a structure in which an injection molding unit and a screw extrusion device are combined.

In the figure, 31 is a fixed mold plate fixed to the molding apparatus main body 30, and 32 is the molding apparatus main body 30.
It is a movable mold plate which is guided by a tie bar (not shown) fixedly mounted on the fixed mold plate 31 and is pressurized from the back side by a hydraulic cylinder (not shown). The movable mold 33 is attached to the abdominal side of the movable mold plate 32, and the fixed mold 34 is attached to the fixed mold plate 31 opposite to the movable mold plate 32. , When the sides of 34 are in close contact,
A mold cavity 35 is formed between the mold plates 33 and 34.

A unit base 40 is attached to the molding apparatus main body 30, and the unit base 40 is mounted on the molding apparatus main body 30.
With a rail guide laid on the base, it can be moved in the screw axial direction of the molding unit, that is, in the left and right front and rear directions in FIG. 1, and by the hydraulic cylinder 57 interposed between the molding apparatus main body 30 and the unit base 40. Move back and forth.
An extrusion cylinder 36 is fixed to the unit base 40 at a pedestal part 36c provided at the rear end thereof. The extruding cylinder 36 is formed with an internal section rotatably incorporating an injection cylinder 41 having an injection nozzle 41a at the tip part which also serves as an extruding screw, and a heater 37 is wound around the outer peripheral surface. is there.

A gear chamber 36b having a large-diameter space is formed at the rear end of the extrusion cylinder 36, and
A gear chamber cover 43 is attached which closes the rear end of the gear chamber 36b and forms the rear end of the extrusion cylinder 36. A thrust bearing 44 is provided at the axial center of the gear chamber cover 43 to support the rear end of the injection cylinder freely in the rotational direction and restrained in the axial direction.

An extruding nozzle 36a is provided at the tip of the extruding cylinder 36, and when the unit table 40 on which the extruding cylinder 36 is placed advances toward the mold plate 31, the extremity of the extruding nozzle 36a is fixed with a fixed metal. The nozzle is touched to the resin injection port of the mold 34. Further, the gear chamber 36 provided at the rear end
A second resin raw material supply passage 36, which is formed in the radial direction on the front side of b and communicates the inside and the outside of the extrusion cylinder 36.
d is provided in the opening to the outer peripheral surface of the second
A second hopper 38 for loading the resin material B into the extrusion cylinder 36, that is, on the outer circumference of the injection cylinder 41 is attached.

Inside the injection cylinder 41, an internal section for accommodating the injection screw 51 is formed from the front end to the rear end, and the second resin raw material supply passage 36b formed in the extrusion cylinder 36 is opened. A second extrusion screw 41b for kneading and plasticizing the second resin raw material B supplied from the second hopper 38 to the outer peripheral surface in front of the portion and extruding it forward.
Are processed and provided.

The rear portion of the injection cylinder 41, on which the second extrusion screw 41 is not formed on the outer peripheral surface, is the extrusion cylinder 3
6 protrudes into a gear chamber 36b provided at the rear end of the gear 6, and a large-diameter gear 42 is fixed to this portion.
And is supported by the thrust bearing 44 provided at the rear end of the extrusion cylinder 36 and projects rearward from the rear end of the extrusion cylinder 36, as described above. The cylindrical portion at the rearmost end of the injection cylinder 41 is supported by a bearing stand 50 fixed to the unit stand 40 with a bearing 53 provided at the tip. The bearing base 50 simultaneously supports a cylindrical shaft portion 51c of an injection screw 51, which will be described later, and which penetrates the bearing base 50 at the same time.

A pinion 45 mounted on the output shaft of an injection cylinder drive motor 46 fixedly mounted on the unit base 40 is meshed with the large diameter gear 42, and the injection cylinder drive motor 46 constituting the second rotating means. , And the pinion 45 rotate the injection cylinder 41 via the large diameter gear 42.

The injection screw 51 housed in the inner section of the injection cylinder 41 has a tip portion 51a and an injection nozzle 41a.
A filling portion of the first resin raw material A is formed between them. Further, at least the outer peripheral surface of the portion housed in the injection cylinder 41 whose rear end is supported by the bearing 53 is provided with the first extrusion screw 51b processed. Further, as described above, the shaft portion 51c having a diameter slightly smaller than the through hole of the bearing base 50 is provided in the portion projecting from the rear end of the injection cylinder 41 and penetrating the bearing base 50, and is supported by the bearing base 50. And extend further rearward, penetrating the bearing stand 50,
A drive unit, which will be described later, is provided at the projecting rearmost end.

As described above, the bearing base 50 is provided with the bearing 53 at the front end portion, supports the injection cylinder 41 at the rear end, supports the injection screw 51 with the shaft portion 51c, and penetrates the shaft portion of the injection screw 51. A first resin raw material supply passage 51d is provided on the upper side in front of the most advanced position of the 51c, and the first resin raw material supply passage 51d is provided so as to communicate with the upper surface of the through hole provided in the shaft center. A first hopper 52 for charging the first resin raw material A into the inside of the injection cylinder 41, that is, on the outer circumference of the injection screw 51 is attached to the opening to the upper surface.

The rear end of the extension shaft of the injection screw 51, which penetrates through the bearing base 50 and projects from the rear end, is connected to the output shaft of the injection screw drive motor 55 for rotating the injection screw 51. The injection screw 51 has an injection screw drive motor 55 as the first rotating means, and a rear end portion of the injection screw 51 that is rotatable, and its forward and backward movements are restricted, so that both ends of the attached bracket 56a are moved back and forth. The drive unit 54 having a hydraulic cylinder 56 as a moving means for moving the injection screw 51 back and forth in the direction is rotationally driven and pushed and pulled linearly in the screw axial direction. The cylinder portion of the hydraulic cylinder 56 is fixed to the unit base 40.

Next, the operation of the two-material composite molding apparatus of this embodiment will be described with reference to FIGS. The nozzle 36a of the extrusion cylinder 36 is pressed against the inlet of the mold 31 (fixed side) of the molding apparatus main body 30 that is clamped, and the extrusion cylinder 3
6 and the first resin raw material A and the second inside the injection cylinder 41
The resin raw material B is heated by the heater 37 for heating, sufficiently kneaded by the first extrusion screw 51b and the second extrusion screw 41b, and plasticized to satisfy the conditions of extrusion and injection. The injection screw 51 retreats while rotating, and a fixed amount of the molten first resin raw material A pushed forward by the rotation of the injection screw 51 is stored in a filling portion in front of the tip end portion 51 a of the injection screw 51. The operating state at this time is as shown in FIG. Next, the injection screw 5
No. 1 is advanced for injection, and the first resin raw material A injected from the filling section is injected into the injection nozzle 41a and the extrusion nozzle 36.
It passes through a and enters the mold cavity 35. At this time,
The injection cylinder 41 is rotated slowly, and the injection screw 51 is also rotated at the same number of rotations so that the difference in rotation between the two becomes relatively zero.

The reason for rotating the injection cylinder 51 is that the extrusion pressure of the second resin material B on the extrusion cylinder 36 side is pushed forward by the hydraulic cylinder 56.
By making the injection pressure equal to 1
This is to prevent the resin raw material A from entering the resin passage on the side of the extrusion cylinder 36. The first resin raw material A injected in this state enters the mold cavity 35 and is filled only near the entrance of the mold cavity 35. Therefore, the injection pressure of the injection screw 51 is low and good. The operating state at this time is as shown in FIG.

(2) Then, the rotations of the injection cylinder 41 and the injection screw 51 are stopped, and the injection screw 51 is slightly retracted due to suck back. When the first resin raw material A injected into the mold cavity 35 is cooled a little and the resin temperature is lowered to increase the viscosity, the injection cylinder 4
1 and the injection screw 51 are rotated at the same number of revolutions to extrude the molten second resin raw material B only from the extrusion cylinder 36 side, and the viscosity in the mold cavity 35 is increased as shown in FIG. 3 (C). Pushed into the first resin raw material A in the state,
The second resin raw material B is filled in the mold cavity 35 while the first resin raw material A is being spread. The state in which this filling is completed is as shown in FIG.

After the first resin raw material A is filled, the injection cylinder 41 and the injection screw 51 are kept rotating for a while until the extrusion pressure is applied to solidify these resins.
A composite resin molded product having the first resin raw material A as a skin and the second resin raw material B filled inside is molded in the mold cavity 35.

(3) Next, the injection cylinder 41 and the injection screw 51 are slightly rotated in the opposite directions at the same number of revolutions, and the second molten resin remaining in the resin passage at the tip of the extrusion cylinder 36 is left.
The resin raw material B is sucked back, and the second resin raw material B is the mold 3
Do not let it leak into 4.

(4) Finally, the molds 33 and 34 are opened, the molded product is taken out, and the mold is clamped again, and the first (1)
Return to step and repeat each step.

As shown in FIG. 4, in the above step (1), except when the injection screw 51 is retracted while rotating, and the molten first resin material A is stored in a fixed amount at the tip of the injection screw 51, the injection cylinder. 41 and the injection screw 51
The injection screw 5 always rotates in the same direction at the same speed.
The feeding operation of the first resin material A on the first side is not performed.

[0044]

As described above, according to the two-material composite molding apparatus of the present invention, the injection molding unit composed of the injection screw and the screw extrusion apparatus composed of the extrusion cylinder are constituted by the structure shown in the claims. Since the composite structure is concentrically arranged and the two-material composite molding apparatus is used, the structure around the injection nozzle is simpler than that of the conventional two injection units, and there is no need for high precision. It can be inexpensive and requires a small installation area.

Further, since the valve mechanism is not required, even a resin material such as a resin material containing long fiber glass or a waste plastic which is difficult to be injection-processed by an ordinary injection molding machine can be easily processed by the screw on the extrusion cylinder side. Since these can be extruded, these resin materials can be utilized as the core material of the molded product.

Furthermore, on the injection screw side, it is not necessary to fill every corner of the mold cavity with resin at the time of injection, so that the injection pressure can be low, and as a result,
The moving means for moving the injection screw back and forth can be low pressure or small size in time, and the structural members related to them can also be used.
Since a small and simple one can be used, the manufacturing cost can be further reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a first embodiment of a two-material composite molding apparatus of the present invention,

FIG. 2 is a bird's-eye view around the drive mechanism of the injection screw and the extrusion screw of the embodiment shown in FIG.

FIG. 3 is an operation process chart showing an operation of injecting and extruding two kinds of resins into the cavity of the mold of the embodiment shown in FIG. 1, and FIG. 3B is a diagram showing the first resin material injection time, FIG.
FIG. 3C is a diagram showing the time of injection of the second resin raw material, FIG. 3D is a diagram showing the time of completion of injection of the second resin raw material,

FIG. 4 is a block diagram showing each operation step of the embodiment shown in FIG. 1 and a diagram showing each screw rotation speed in the same step;

FIG. 5 is a view showing a nozzle for injection molding of a conventional two-material composite molding apparatus.

[Explanation of symbols]

 30 Molding Device Main Body 31 Fixed Mold Plate 33 (Movable Side) Mold 34 (Fixed Side) Mold 35 Mold Cavity 36 Extrusion Cylinder 36a Extrusion Nozzle 36b Gear Chamber 36c Pedestal 36d Second Resin Raw Material Supply Channel 37 Heating Heater 38 Second hopper 40 Unit stand 41 Injection cylinder 41a Injection nozzle 41b Second extrusion screw 42 Large diameter gear 43 Gear chamber lid 44 Thrust bearing 45 Pinion 46 Injection cylinder drive motor 50 Bearing stand 51 Injection screw 51a Tip 51b First extrusion screw 51c Shaft 51d First resin raw material supply path 52 First hopper 53 Bearing 54 Drive unit 55 Injection screw drive motor as first rotating means 56 Hydraulic cylinder 57 as moving means 57 Hydraulic cylinder

Claims (1)

[Claims] 1. A two-material composite molding apparatus for injection-molding a molded product with a plurality of different or different resin raw materials, a unit base mounted on the molding machine body so as to be movable back and forth, and a tip fixed to the unit base. An extrusion nozzle is provided at a rear portion thereof, a gear chamber is provided at a rear end portion thereof, and a thrust bearing is provided at a rear end of the gear chamber rearwardly so as to be freely rotatable and restrain the forward / backward movement to support the second resin. An extrusion cylinder provided with a second hopper for supplying the raw material on the outer periphery and a rear end portion supported by the thrust bearing, and a gear is fixedly attached to an outer peripheral surface passing through the gear chamber and housed in the extrusion cylinder. A second injection source nozzle is provided at the front end, and the second resin raw material supplied from the second hopper is kneaded and transferred to the outer peripheral surface in front of the gear chamber.
An injection cylinder provided with an extrusion screw; a second rotating means for driving the gear to rotate the injection cylinder; and a second resin material housed in the injection cylinder for kneading and transferring the first resin raw material on the outer peripheral surface. 1 injection screw provided with an extruding screw, a first rotating means for rotating the injection screw, which is installed at a rear end portion of the injection screw protruding from a rear end of the injection cylinder, and a moving means for moving back and forth. A drive unit, and a bearing that is disposed between the extrusion cylinder and the drive unit and that supports the rear end of the injection cylinder that protrudes from the rear end of the extrusion cylinder, is provided at the front end.
A two-material composite, comprising: a bearing stand provided with a first hopper for supplying the first resin raw material from the outer periphery of the injection screw penetrating the outer periphery to the interior of the injection cylinder. Molding equipment.