JPH04339629A - Screw for in-line screw type injection molding device - Google Patents

Abstract

PURPOSE:To constitute the title screw so that mixing and kneading of double liquid mixed resin and a resin material having a wide range viscosity ranging from low viscosity up to high viscosity where a difference in the viscosity is high are performed favourably without necessitating a long shaft length and neither an increase in necessary material feed nor worsening in washability of the inside of the injection cylinder chamber are generated. CONSTITUTION:The title screw is constituted so that a mixing screw part 14 having a smaller pitch and lead angle as compared with those of a screw pump acting part 13 is provided more forward than the screw pump acting part 13 performing a screw pump action, an axial line groove 7 is provided in a mixing screw part 15 in the axial line direction, a part of a resin material flows along a screw groove of the mixing screw part 15, a plurality of flows of the resin materials are generated by advancing the residual resin material in the axial line groove 17 and meeting and branching-off of those flows to be obtained as they move in the mixing screw part 15 are repeated.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an injection screw used in an in-line screw injection molding device.
In particular, the present invention relates to a screw for an in-line screw type injection molding apparatus suitable for injection molding of a double-component mixed resin such as silicone rubber LIM and other double-component mixed reactive resins.

0002

[Prior Art] In-line screw type injection molding equipment generally includes an injection cylinder member that has an injection cylinder chamber inside and has a resin injection nozzle at one end, and an injection cylinder member that is rotatable and axially connected to the injection cylinder chamber. It has an injection screw arranged to be movable in the direction, a rotation drive means such as a hydraulic motor or an electric motor that rotationally drives the injection screw, and a hydraulic injection cylinder device that drives the injection screw in the axial direction. The injection screw is rotationally driven around its own central axis by the rotational drive means, whereby the resin is taken into the injection cylinder chamber by the screw pump action, and the injection screw is driven forward in the axial direction by the injection cylinder device. Accordingly, the resin taken into the injection cylinder chamber is injected from the resin injection nozzle toward the cavity of the molding die.

The injection screw used in the above-mentioned in-line screw type injection molding apparatus generally has a screw pump action section that performs a screw pump action, and a screw groove bottom diameter ( The compound part has a compound part whose diameter (trough diameter) gradually increases as it moves forward, and the compound part compresses and kneads the resin material fed from the screw pump action part by rotation.

0004

[Problems to be Solved by the Invention] The injection screw described above is suitable for injection molding of thermoplastic resins, and has not been developed for low-viscosity resin materials.
This injection screw simply compresses and mixes the resin material in one flow during the feeding process of the resin material by the screw, and therefore a good kneading effect cannot be obtained. do not have. This is silicone L
This is a problem in injection molding of a double-component mixed resin such as IM, and sufficient kneading properties cannot be obtained, especially in injection molding of low-viscosity resin materials or double-component mixed resins with a large viscosity difference.

[0005] In order to increase the kneading performance, it is necessary to increase the axial length of the injection screw. However, increasing the axial length of the injection screw leads to an increase in the size of the in-line screw injection molding apparatus.

Furthermore, since the conventional injection screw compresses the resin material in the compound portion, this creates resistance to the rotation of the injection screw. This increases the rotational resistance of the injection screw, and in addition, when it is necessary to forcibly supply the resin material to the screw part using a pushing device, such as low viscosity liquid resin, this is necessary. This results in an increase in the material supply pressure, and it becomes necessary to make the material supply pressure of the pushing device higher than the resin material compression pressure of the compound section.

[0007] Furthermore, in order to improve the kneading properties of resin materials,
It has been considered to provide a weir in the middle of the injection screw to divide the injection screw into a plurality of zones in the axial direction.

However, this also provides a large resistance to the flow of the resin material, leading to an increase in the required material supply pressure. In addition, the weir obstructs the flow of cleaning liquid during cleaning, impairs cleaning performance in the injection cylinder chamber, and thereby prevents the resin material from being washed away well.

In injection molding of a double-component mixed resin such as silicone LIM, a static mixing mechanism may be used instead of an in-line screw to mix the resin materials.

However, in the case of a static mixing mechanism, static divisional mixing is used, so a long mixing head for mixing and high material supply pressure are required, and if the resin material has a high viscosity, Furthermore, it requires a higher material supply pressure, it is difficult to mix resin materials with different viscosities, and there are disadvantages in that the injection molding apparatus becomes larger. Furthermore, in the case of a static mixing mechanism, the residence time of the resin material in the mixing zone is long, so there is a restriction that the resin material must have a long pot life. Also, in this case, the double-component mixed resins having a large viscosity difference are not sufficiently mixed.

[0011] The present invention has been made by focusing on the above-mentioned problems in conventional injection molding equipment. An in-line screw injection molding machine that can mix and knead resin materials without requiring a long shaft length, and does not increase the required material supply pressure or impair the cleaning performance of the injection cylinder chamber. The purpose is to provide screws for

0012

[Means for Solving the Problems] According to the present invention, the above object is to provide a screw pump action section that performs a screw pump action, and a screw pump action section that is provided in front of the screw pump and has a pitch smaller than that of the screw pump action section. This is achieved by a screw for an in-line screw type injection molding apparatus, which has a mixing screw portion with a small lead angle, and the mixing screw portion is provided with an axial groove in the axial direction.

[0013]

[Operation] According to the above structure, the resin material is sent to the mixing screw section by the rotation of the screw pump action section, a part of this resin material flows along the screw groove of the mixing screw section, and the remaining resin material The resin material advances in the axial groove, and as a result, a plurality of resin materials flow, and as they advance through the mixing screw portion, they repeatedly merge and separate. This allows mixing and kneading of the resin materials to be performed evenly and efficiently.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 and 2 show a case in which an in-line screw injection molding apparatus having a screw for an in-line screw injection molding apparatus according to the present invention is applied as an injection apparatus for a double-component reaction-curing resin such as silicone rubber. An example is shown.

[0016] The screw type resin injection device for injection molding is as follows:
The cylinder fixing base 3 has a cylinder fixing base 3 fixed on a forward and backward moving board 1, and the cylinder fixing base 3 fixes and holds an injection cylinder member 5 in a horizontal position.

The injection cylinder member 5 has an injection cylinder chamber 7 therein, and has a tapered cylinder head member 9 for holding an injection nozzle connected to one end on the same axis.

An injection screw 11 is arranged in the injection cylinder chamber 7 of the injection cylinder member 5 so as to be rotatable about its own central axis and movable in the axial direction. As clearly shown in FIGS. 3 to 5, the injection screw 11 has a triangular thread-shaped screw pump action section 13 with a relatively large pitch and a large lead angle, and is provided in front of the screw pump action section 13. Screw pump action part 1
It has a square thread-shaped mixing screw portion 15 with a small pitch and a small lead angle compared to No. 3. The mixing screw portion 15 has an even number of rectangular cross-section axial grooves 17 with a depth equal to the screw height in the entire axial direction of the mixing screw portion 15. They are set up. Specifically, the screw pump action section 13 has an axial length of about 90 to 120 mm and a pitch of 2.
The mixing screw part 15 may be a non-return triangular thread with a diameter of about 0 mm, an inclination angle of about 15 degrees, and a depth of about 2.5 to 2.7 mm. is about 4.5 to 6.0 mm, and the depth is 2
．． It may be a square thread of about 2 to 2.4 mm, and the groove width of the axial groove 17 may be about 2.3 to 2.5 mm.

The tip of the injection screw 11 is shown in FIG.
~ As shown in Figure 8, the screw head member 19
is fixed with screws, and a seal ring member 23 is externally fitted onto the shaft portion 21 of the screw head member 19 so as to be movable in the axial direction. The seal ring member 23 is movable in the axial direction between a seal seat surface 25 formed by the distal end surface of the injection screw 11 and an end surface 27 of the screw head member 19 opposing this, as shown in FIG. By sitting on the seal seat surface 25, communication between the nozzle side and the screw side of the injection cylinder chamber 7 is cut off, whereas as shown in FIG. 7, by seating on the end surface 27, the seal seat surface 25, the gap 29 between the shaft portion 21
The nozzle side of the injection cylinder chamber 7 and the screw side are communicated by an odd number of grooves 35 (in this embodiment, three grooves) formed in the head 33 of the screw head member 19 and the gap 31 between the injection cylinder chamber 7 and the screw head 19. It's supposed to be forced. The reason why the axial grooves 17 and the cut grooves 35 are provided in an odd number and an even number is to shift the phase between them. Since these are in a relative relationship, it is sufficient if they are arranged so as to be out of phase with each other.

Two O-rings 37 are provided on the outer periphery of the seal ring member 23, spaced apart from each other in the axial direction, for sealing between the outer periphery of the seal ring member 23 and the inner periphery of the injection cylinder of the injection cylinder member 5. It is provided. The reason why two O-rings are provided in parallel is to prevent the sealing member 23 from tilting, and is effective in preventing galling.

A nozzle device 39 with a valve is attached to the tip of the cylinder head member 9. As clearly shown in FIG. 9, the valved nozzle device 39 includes a nozzle body 43 that is movably inserted in the tip hole 41 of the cylinder head member 9 in the axial direction, and a nozzle body 43 that is inserted into the tip hole 41 of the cylinder head member 9 so as to be movable in the axial direction. 43, a spool valve ring 47 externally fitted to the thin shaft portion 45 of the cylinder head 43 so as to be relatively displaceable in the axial direction, a valve seat member 49 fixed to the rear end of the thin shaft portion 45, and a nozzle body 43 connected to the cylinder head member 9. The nozzle body 43 has a compression coil spring 51 that biases toward the valve closing side, that is, to the left side in the figure, and the nozzle body 43 resists the spring force of the compression coil spring 51 due to the touch pressure with the molding die M. By moving the head member 9 relative to the right side in the figure, the valve seat member 49 is separated from contact with the spool valve ring 47, and the valve hole 53 provided in the radial direction in the thin shaft portion 45 is inserted into the cylinder chamber. It is designed to be exposed to 7. The valve hole 53 communicates with a guide hole 55 that extends in the axial direction through the center of the nozzle body 43 and a nozzle hole 57 that is continuous with the guide hole 55 and directs the injection resin in the cylinder chamber 7 through the guide hole 55 to the nozzle. It is designed to lead to the hole 57.

Further, an O-ring 59 for sealing is provided on the outer periphery of the nozzle body 43.

As shown in FIGS. 1 and 2, an O-ring 61 is provided near the rear end of the injection screw 11 to prevent the resin from leaking rearward.

A plunger shaft 63 is coaxially fixedly connected to the rear end of the injection screw 11. The outer periphery of the part where the plunger shaft 63 is fitted with the injection cylinder member 5 has a reverse thread 6 to prevent the resin from leaking backwards.
5 is formed, and a mechanical seal 67 is installed between the plunger shaft 63 and the cylinder fixing base 3.

The plunger shaft 63 is connected to the injection cylinder member 5.
It protrudes rearward from the rear end, and this protrusion is rotatable around its own central axis and moved in the axial direction by a linear motion bearing 71 held by a bearing support member 69 fixed to the cylinder fixed base 3. Possibly supported.

A flange 73 is provided near the rear end of the plunger shaft 63, and this portion of the plunger shaft 63
On the outer periphery of the drive arm 7, as shown well in FIG.
5 is connected in the axial direction to be relatively rotatable with a needle thrust bearing 79 sandwiched between an end ring 77 fixedly attached to the plunger shaft 63 and the flange 73.

As clearly shown in FIG. 2, the drive arm 75 extends in the radial direction of the injection cylinder member 5, and is connected at its tip to the tip of the cylinder rod 83 of the pneumatic cylinder device 81. There is. The pneumatic cylinder device 81 is
It is arranged on the side of the injection cylinder member 5 in parallel thereto, and is fixed to the side wall of the cylinder fixing base 3.

A shaft receiving hole 85 is formed at the rear end of the plunger shaft 63, extending in the axial direction from the center thereof and opening at the rear end surface of the plunger shaft 63. A rotary drive shaft 89 can be inserted into and removed from the shaft receiving hole 85 by a torque transmitting linear motion bearing 87, in other words, it is fitted to the plunger shaft 63 in a telescoping torque transmitting relationship.

The rotary drive shaft 89 is connected to an output shaft 93 of an electric motor 91 fixed on the forward/reverse base plate 1 through a coupling 95 in a torque transmitting relationship.

A resin supply block 97 is fixed to the cylinder fixing base 3. In this embodiment, the resin supply block 97 is equipped with two resin material supply tubes 99 which also serve as measuring cylinders, as shown in FIG. are installed in parallel with each other. Each of the resin material supply tubes 99 has a resin discharge port 101 at its tip and is connected to the resin supply block 97.
It communicates with a resin passage 103 provided in the. The resin passage 103 is connected to the resin passage 107 of the resin supply block 97 via a rotary valve 105 provided in the resin supply block 97.
, a resin passage 109 of the cylinder fixing base 3, and a resin supply port 111 provided at the intermediate portion of the injection cylinder member 5.

The rotary valve 105 is a manual type that is rotated by a manual lever 113, and in the rotational position shown in FIGS. 1 and 11, the resin passage 103 and the resin passage 107 are connected to each other. When the cleaning solvent passage 115 formed in the resin supply block 97 is rotated 90 degrees counterclockwise from the rotational position shown in FIGS. 1 and 11, the cleaning solvent passage 115 formed in the resin supply block 97 is The passage 103 and the resin passage 107 are connected to each other, and when the passage 103 and the resin passage 107 are rotated 90 degrees counterclockwise from the rotation position shown in FIGS. 1 and 11, the resin passage 103 and the resin passage 107 are The cleaning solvent passage 115 is connected to the resin passage 107 by cutting off the communication, and the cleaning solvent passage 115 is connected to the resin passage 103 by cutting off the communication between the resin passage 103 and the resin passage 107. There is.

As shown in FIG. 11, each of the resin material supply tubes 99 has a resin intake port 117 on the distal end side, and each of the resin material supply tubes 99 is filled with liquid from an individual resin material tank 119. The resin material is resin supply pipe 1
21, an on-off valve 123, and a resin supply pipe 125 for replenishment.

The cleaning solvent passage 115 communicates with a cleaning solvent supply port 127 provided in the resin supply block 97, and is configured to supply cleaning solvent from a cleaning solvent tank 129 via a cleaning solvent supply pipe 131. It has become.

A piston 133 is fitted into each of the resin material supply tubes 99, and as the pistons 133 move to the left in the figure, the resin material in the resin material supply tube 99 is discharged from the resin discharge port 101. It is designed to be discharged into a passage 103.

In the resin supply block 97, a pneumatic cylinder device 135 for pressurizing the resin material is connected to the resin material supply tube 99.
is installed parallel to the The pneumatic cylinder device 135 for pumping resin material has a connecting plate 139 attached to the tip of a piston rod 137, and one end of two push rods 141 is fixedly connected to the connecting plate 139, respectively. A push pad 143 is attached to the tip of each push rod 141, and each push pad 143 is connected to the piston 1 of the resin material supply tube 99.
33 and presses it to the left in the figure.

A U-shaped position detection rod 145 is attached to the push pad 143, and a switch support rod 147 is attached to the resin supply block 97 in parallel with the resin material supply tube 99. Proximity switches 149 and 151 are attached to the switch support rod 147 so that their mounting positions can be adjusted to perform switching when a switch sensitive member 153 attached to the tip of the position detection rod 145 approaches. As a result, the push pad 143 and the resin material supply tube 99
The axial position of the piston 133 is monitored.

The forward and backward movement base plate 1 is connected to a moving table 157 of a rodless pneumatic cylinder device 155, so that it can be moved forward and backward by the rodless pneumatic cylinder device 155.

In this embodiment, a cooling jacket 159 is attached to the front portion of the injection cylinder member 5 that is exposed to the outside in order to prevent the resin in the injection cylinder chamber 7 from hardening. ing.

According to the above-described configuration, when injecting resin into the mold M, the rotary valve 105 first moves to the position shown in FIG.
Alternatively, the pneumatic cylinder device 135 for pressurizing the resin material is driven in the rotational position as shown in FIG.
The piston 133 of each resin material supply tube 99 is pushed to the left in the figure by each of the push rod 141 and push pad 143, whereby the resin material of each resin material supply tube 99 is transferred to the resin passage 103 and the rotary valve 105.
, and is sent into the injection cylinder chamber 7 of the injection cylinder member 5 from the resin supply port 111 through the resin passages 107 and 109. In addition, along with this, the rotation drive shaft 89 is driven by the electric motor 91.
is rotationally driven, and its rotation is transmitted to the plunger shaft 63 and the injection screw 11 by a torque transmission type linear motion bearing 87. As a result, these rotate around their own central axes, and the resin material sent into the injection cylinder chamber 7 moves forward inside the injection cylinder chamber 7 by the screw pump action of the screw pump action part 13 of the injection screw 11. , that is, it is fed under pressure to the mixing screw section 15.

Since the mixing screw section 15 is provided with the axial groove 17 throughout its axial direction, a portion of the resin material from each resin material supply tube 99 that is pressure-fed to the mixing screw section 15 is The resin material flows along the screw groove of the mixing screw portion 15, and the remaining resin material advances through each axis line groove 17, thereby producing a plurality of flows. As these flow through the mixing screw section 15, they repeatedly merge and diverge. Thereby, the resin materials from each resin material supply tube 99 are mixed and kneaded evenly and with high efficiency.

The mixed and kneaded resin materials reach the tip of the injection screw 11, press the seal ring member 23 to the left in the figure, and push it open to form the gaps 29 and 3.
1 and through the groove 35 of the screw head member 19 to the nozzle side of the cylinder chamber 7.

At this time, the seal ring member 23 does not rotate due to the resistance caused by the O-ring 37, and only the injection screw 11 and screw head member 19 rotate.
The seal ring member 23 and the injection screw 11 rotate relative to each other. As a result, the seal ring member 23 is reliably opened, and the gap 29 serving as the resin passage is reliably secured.

As the nozzle side of the injection cylinder chamber 7 is filled with the resin material, the reaction force acts on the injection screw 11 as a force to the right in the figure, thereby causing the injection screw 11 and the flange to The shaft 63 retreats to the right in the figure. This retreat is performed with low resistance under the guidance of the linear motion bearing 71, and due to this retreat, the amount of entry of the rotary drive shaft 89 into the shaft receiving hole 89 increases,
Even under the relative movement of the flange shaft 63 and the rotary drive shaft 89 in the axial direction, the rotary drive shaft 8 by the electric motor 91
The rotation of 9 is driven by a torque-transmitting linear motion bearing 87 that drives the plunger shaft 63 and the injection screw 1.
1 without any delay.

At this time, the injection screw 11 may be lightly driven together with the plunger shaft 63 by the pneumatic cylinder device 81 to provide a backward force to the injection screw 11 in order to help the injection screw 11 move backward. In this case, the plunger shaft 63 is rotating,
Since the drive arm 75 and the plunger shaft 63 can rotate relative to each other by the thrust needle bearing 77, the rotational drive and the axial direction drive of the plunger shaft 63 are compatible with each other without any problem.

When the injection cylinder chamber 7 is filled with a predetermined amount of resin material, the injection screw 1 is activated by the electric motor 91.
1, the pneumatic cylinder device 135 stops discharging the resin material from the resin material supply tube 99, and then the rodless pneumatic cylinder device 155 moves the reciprocating substrate 1 forward. As a result, the cylinder fixed base 3,
The entire injection cylinder member 5 and injection screw 11 move forward, and as shown in FIG.
is in contact with the molding die M, and the nozzle hole 57 is in contact with the molding die M.
It becomes connected to the sprue S of. As the forward/backward movement board 1 is further moved forward, the cylinder head member 9 is moved forward with respect to the nozzle body 43, and thereby the valve seat member 49 is separated from the contact with the spool valve ring 47 and the valve hole is moved. 53 is exposed to the injection cylinder chamber 7, and the injection cylinder chamber 7 comes to communicate with the nozzle hole 57 via the guide hole 55.

Next, the injection screw 11 is driven forward by the pneumatic cylinder device 81. Then, first, the seal ring member 23 moves backward with respect to the screw head member 19 due to the pressure of the resin material in the injection cylinder chamber 7 and seats on the seal seat surface 25, and the nozzle side and the screw side of the injection cylinder chamber 7 are separated. communication is cut off. Furthermore, by driving the injection screw 11 forward, it acts as a piston, and the forward thrust of the injection screw 11 by the pneumatic cylinder device 81 is converted into injection pressure on the resin material in the injection cylinder chamber 7, and the injection The resin material in the cylinder chamber 7 is injected from the nozzle hole 57 to the sprue S of the mold M.

At this time, the resin material in the injection cylinder chamber 7 is spread between the outer periphery of the seal ring member 23 and the injection cylinder member 5.
A backflow that leaks backward from the gap between the injection cylinder and the inner peripheral surface of the injection cylinder tends to occur, but since this gap is sealed by the O-ring 37, the occurrence of backflow is avoided. . This eliminates pressure loss and allows high injection pressure to be obtained. This means that
It is particularly useful in injection molding of liquid resins that have low viscosity, high fluidity, and are prone to backflow.

In injection molding of a double-component reaction-curing resin such as silicone rubber, the resin passages 107, 109,
If the resin material mixed in the resin supply port 111, the injection cylinder chamber 7, etc. stagnates for a certain period of time or more, this will cause a curing reaction. By switching, the cleaning solvent in the cleaning solvent tank 129 is flowed from the cleaning solvent supply port 127 to the resin passages 107, 109, the resin supply port 111, the injection cylinder chamber 7, etc., and these can be easily cleaned with the cleaning solvent. Can be done. In this case, since the injection screw 11 is not provided with a weir or the like and there are no obstacles,
The injection cylinder chamber 7 is well cleaned with the cleaning solvent.

FIG. 12 shows another embodiment of the screw for an in-line screw type injection molding apparatus according to the present invention. In this embodiment, the injection screw 1
1 is not provided with a seal ring mechanism as a gate, and the injection screw 11 has a sharp tip 11a.

In this embodiment as well, the injection screw 11 has a relatively large pitch and a triangular screw pump action portion 1 with a large lead angle, as in the above embodiment.
3, and a square thread-shaped mixing screw part 15 which is provided in front of the screw pump action part 13 and has a small pitch and a small lead angle compared to the screw pump action part 13.

Therefore, in this embodiment as well, the same functions and effects as in the above-mentioned embodiment can be obtained.

Although the present invention has been described above in detail with reference to specific embodiments, the present invention is not limited to these, and various embodiments are possible within the scope of the present invention. This will be obvious to those skilled in the art.

[0053]

Effects of the Invention As understood from the above explanation, according to the screw for an in-line screw type injection molding apparatus according to the present invention, the resin material is sent to the mixing screw section by the rotation of the screw pump action section. A part of the resin material flows along the screw groove of the mixing screw section, and the remaining resin material flows along the axial groove, etc., resulting in multiple flows of resin materials.As they advance through the mixing screw section, they merge and separate into streams. Mixing and kneading of resin materials will become easier as you will have to repeat the process repeatedly.
Regardless of the viscosity of a double-component mixed resin with a large viscosity difference, a long screw shaft length is not required, and the process can be performed evenly with high efficiency.

Moreover, this screw does not compress and knead the resin material, and is not provided with a compounding section or a weir, which increases the required material supply pressure and impairs the cleaning performance in the injection cylinder chamber. This makes it possible to reduce the required material supply pressure compared to the conventional method.

[0055] These features make it possible to downsize the in-line screw type injection molding machine, and also to use pneumatic fluid pressure cylinder devices for pushing the material, so that the in-line screw type injection molding machine can be simplified. become.

[Brief explanation of drawings]

FIG. 1 shows a portion of an embodiment in which an in-line screw injection molding apparatus having a screw for an in-line screw injection molding apparatus according to the present invention is applied as an injection apparatus for a double-component reaction-curing resin such as silicone rubber. A side view shown in cross section.

FIG. 2 is a plan cross-sectional view of the screw portion of the in-line screw injection molding apparatus shown in FIG. 1;

FIG. 3 is a perspective view showing an embodiment of a screw for an in-line screw injection molding apparatus according to the present invention.

FIG. 4 is a half-sectional view showing an embodiment of a screw for an in-line screw injection molding apparatus according to the present invention.

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

FIG. 6 is an enlarged sectional view showing an embodiment of a seal ring part used in an in-line screw injection molding apparatus having a screw for an in-line screw injection molding apparatus according to the present invention in a closed state.

FIG. 7 is an enlarged cross-sectional view of the seal ring shown in FIG. 6 in an open state.

FIG. 8 is a sectional view taken along line VII-VII in FIG. 7;

FIG. 9 is a sectional view showing an embodiment of a valved nozzle device used in an in-line screw injection molding device having a screw for an in-line screw injection molding device according to the present invention.

FIG. 10 is an enlarged sectional view taken along line XX in FIG. 1;

FIG. 11 is a partial cross-sectional view showing an embodiment of a resin material supply portion used in an in-line screw injection molding apparatus having a screw for an in-line screw injection molding apparatus according to the present invention.

FIG. 12 is a half-sectional view showing another embodiment of the screw for an in-line screw injection molding apparatus according to the present invention.

[Explanation of symbols]

7 Cylinder chamber for injection 9 Cylinder head member 11 Injection screw 13 Screw pump action part 15 Mixing screw part 17 Axis groove

Claims (1)

[Claims] 1. The mixing screw has a screw pump action section that performs a screw pump action, and a mixing screw section that is provided in front of the screw pump and has a small pitch and a small lead angle compared to the screw pump action section, A screw for an in-line screw type injection molding device, characterized in that the screw portion is provided with an axial groove in the axial direction.