JP2013252643A - Kneading extrusion molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading extrusion molding apparatus that can improve usage efficiency of materials, can stably perform stable extrusion molding with finely kneaded kneading materials, and can obtain a simple configuration.SOLUTION: A kneading extrusion molding apparatus 50 includes: a kneading section 1 for forming kneading materials M; and an extrusion molding section 15 for performing extrusion molding of the kneading materials M, and also includes: a moving duct 7 that moves the kneading materials M from the kneading section 1 to the kneading molding section 15; a cylinder accumulator section 8 that is provided in the middle section of the moving duct 7, and accumulates the moving kneading materials M; a piston section 9 that is provided to advance and retreat in an axial direction, and forms an accumulation space S inside the accumulator section 8, that can change the capacity; a pressurizing section 20 that pressurizes the piston section 9 so that the piston section moves following the increase/decrease of the kneading materials M stored in the accumulation space S; and an ejection port 10 that is provided through sides of the accumulator section 8 in an area in which the capacity of the accumulation space S has a constant value or more.

Description

  The present invention relates to a kneading extrusion molding apparatus. For example, the present invention relates to a kneading and extrusion molding apparatus that performs kneading and extrusion using a kneaded material while continuously kneading two or more kinds of solid or liquid raw materials to form a kneaded material.

2. Description of the Related Art Conventionally, a kneading extrusion molding apparatus is known in which two or more raw materials in solid or liquid form are continuously kneaded and extruded.
In such a kneading extrusion molding apparatus, in order to perform stable molding, it is necessary to balance the supply amount of the kneading material and the molding amount of the extrusion molded product.
However, since there are various conditions for obtaining good quality in kneading and extrusion molding, it is necessary to perform complicated condition adjustment and operation control in order to maintain the supply and demand balance of the kneaded material while satisfying each quality. is there. In addition, such condition adjustment and operation control must be adjusted each time the type of kneaded material, the shape of the extruded product, the production amount of the extruded product, and the like, so it cannot respond quickly to changes in the production plan. There is also a problem.
For this reason, Patent Document 1 discloses a kneading and extruding apparatus that discharges a part of the kneaded material between the extrusion port of the barrel that kneads and extrudes the raw material and the die portion so as to keep the pressure of the kneaded material constant. Has been proposed.

JP 2011-245790 A

However, the conventional kneading extrusion molding apparatus as described above has the following problems.
In the kneading and extruding apparatus of Patent Document 1, the pressure of the kneading material supplied to the extrusion port is kept constant by discharging the kneading material. For this reason, only the kneading material necessary for extrusion molding can be supplied to the die part and stable molding can be performed. However, in order to perform such operation, the supply amount of the kneading material always requires extrusion molding. The amount needs to be exceeded.
Therefore, since a part of the kneaded material formed in the kneading part must be discharged and continuously discarded, there is a problem that the kneaded material is wasted.
Also, in order to suppress waste due to discharge, when the supply amount of the kneading material is brought close to the required amount in the extrusion molding unit, the supply amount of the kneading unit reduces the consumption of the extrusion molding unit due to variations in the condition of the kneading unit and the kneading ability. The pressure of the kneaded material may be too low. In this case, there is a problem that the quality of the extruded product is deteriorated.

  The present invention has been made in view of the above problems, and can improve the utilization efficiency of raw materials, and can stably perform stable extrusion with a kneaded material that is well kneaded. An object of the present invention is to provide a kneading extrusion molding apparatus having a simple configuration.

  In order to solve the above-mentioned problems, in the invention according to claim 1, a kneading part for kneading raw materials to form a kneaded material, and an extrusion molding part for pumping the kneaded material to a die part to perform extrusion molding A kneading extrusion molding apparatus comprising: a moving pipe connected between the kneading section and the extrusion molding section and moving the kneaded material from the kneading section to the extrusion forming section; and an intermediate between the moving pipes A cylindrical accumulator unit that stores the kneaded material being moved, and is provided in the accumulator unit so as to be capable of moving back and forth along the axial direction, whereby the volume of the accumulator unit is stored in the accumulator unit. A pressure is applied so that the piston part that forms the space and the piston part move following the increase / decrease of the kneaded material stored in the storage space in close contact with the kneaded material moved to the storage space. Pressurization part , A structure in which and a discharge opening provided through a side of the accumulator unit in the region where the volume of the reservoir space is above a certain value.

  According to a second aspect of the present invention, in the kneading extrusion molding apparatus according to the first aspect, the pressurizing part pressurizes the piston part at a constant pressure.

  According to a third aspect of the present invention, in the kneading extrusion molding apparatus according to the first or second aspect, the discharge port has a configuration having an elongated shape in the axial direction.

  In invention of Claim 4, in the kneading extrusion molding apparatus of any one of Claims 1-3, the opening amount of the circumferential direction orthogonal to the said axial direction is the said discharge port with respect to the said storage space. The piston portion has an opening shape that gradually increases in the backward direction.

  The kneading extrusion molding apparatus of the present invention includes a piston portion pressurized by the pressure portion inside the accumulator portion to form a variable volume storage space and a discharge port that opens and closes according to the movement position of the piston portion. Therefore, it is possible to improve the utilization efficiency of the raw materials inside, and to achieve a simple configuration capable of stably performing stable extrusion with the kneaded material kneaded well.

It is a typical block diagram which shows schematic structure of the kneading | mixing extrusion molding apparatus of embodiment of this invention. It is A view in FIG. It is operation | movement explanatory drawing of the kneading | mixing extrusion molding apparatus of embodiment of this invention. It is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 1st modification of embodiment of this invention, and a 2nd modification. It is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 3rd modification of the embodiment of this invention, and a 4th modification.

Below, the kneading extrusion molding apparatus of embodiment of this invention is demonstrated with reference to an accompanying drawing.
FIG. 1 is a schematic configuration diagram showing a schematic configuration of a kneading extrusion molding apparatus according to an embodiment of the present invention. FIG. 2 is a view on A in FIG.

As shown in FIG. 1, the kneading extrusion molding apparatus 50 of the present embodiment continuously kneads two or more kinds of raw materials m that are solid or liquid to form the kneading material M, It is an apparatus which uses and performs extrusion molding.
The kneading material M is a material for extruding the extruded product 16 and has an appropriate composition corresponding to the material characteristics required for the extruded product 16.
The raw material m is composed of a plurality of materials such as resins and additives necessary for realizing the composition of the kneaded material M.
Further, the shape and type of the extruded molded product 16 is not particularly limited as long as it is a molded product by extrusion molding using the kneaded material M, and examples thereof include tubes, corner guards, tapes, films, yarns, filaments, and the like. Can be mentioned.

  The schematic configuration of the kneading extrusion molding apparatus 50 includes a kneading unit 1, an extrusion molding unit 15, a moving pipeline 7, an accumulator unit 8, a discharge port 10, a piston unit 9, and a pressurizing unit 20.

The kneading unit 1 has a configuration in which a kneading screw 4 that is rotationally driven by a driving unit 2 is inserted into a bottomed cylindrical kneading cylinder 5 with a gap.
A kneading outlet 6 for discharging the kneaded material M is provided at the center of the bottom of the kneading cylinder 5 facing the tip of the kneading screw 4.
At the side of the kneading cylinder 5, a material charging port 5 a for supplying the raw material m to the gap between the inner surface of the kneading cylinder 5 and the kneading screw 4 is provided. Since FIG. 1 is a schematic diagram, the material inlet 5a is simply drawn as a through-hole, but a hopper, a supply pipe, or the like (not shown) may be connected.
A gap between the inner surface of the kneading cylinder 5 and the kneading screw 4 between the material charging port 5a and the kneading outlet 6 is a kneading space for shearing and kneading the raw material m.

The drive unit 2 includes a motor 3 disposed in a cylindrical casing connected to the proximal end side of the kneading cylinder 5, and a controller 25 that controls the rotation speed of the motor 3.
The rotation shaft 3 a of the motor 3 is connected to the base end portion of the kneading screw 4, whereby the rotational driving force of the motor 3 is transmitted to the kneading screw 4.

  The extrusion molding unit 15 is an apparatus part that extrudes the kneaded material M supplied from the kneading unit 1 and molds the extruded product 16. The gear pump 13 increases the pressure of the kneaded material M to a pressure at which extrusion molding is possible. In order to extrude the kneaded material M fed by pressure from the gear pump 13, a die portion 14, which is a die member having a hole shape corresponding to the cross-sectional shape of the extruded product 16, is provided.

  The moving pipeline 7 is a pipeline that is connected between the kneading section 1 and the extrusion molding section 15 and moves the kneaded material M from the kneading section 1 to the extrusion molding section 15. Moreover, the moving pipe line 7 has a heater for preventing the kneading material M being moved from being hardened.

The accumulator unit 8 is a cylindrical member that is provided in an intermediate portion of the moving pipeline 7 and stores the kneaded material M that is moving.
In the present embodiment, a distal end portion 8A and a cylindrical portion 8B are provided from the distal end side (right side in FIG. 1) connected to the moving pipeline 7 toward the proximal end side (left side in FIG. 1), and the central axis is It arrange | positions so that it may become substantially horizontal (a horizontal is included).

8 A of front-end | tip parts have the mortar-shaped inner peripheral surface 8a gradually diameter-reduced from the cylindrical part 8B side to the front end side.
In the tip 8A, an inlet 8b connected to the moving conduit 7 on the kneading part 1 side is provided through the side where the inner peripheral surface 8a has the maximum diameter, and the tip where the inner peripheral surface 8a has the minimum diameter is provided. At the position, a supply port 8c connected to the moving pipeline 7 on the extrusion molding unit 15 side is provided.
In this embodiment, the inflow port 8b is provided in the side part above the front-end | tip part 8A.

The cylindrical portion 8B includes a cylindrical inner peripheral surface 8d having a cylindrical surface equal to the maximum diameter of the inner peripheral surface 8a, and a proximal inner side that closes the cylindrical inner peripheral surface 8d with a proximal end portion opposite to the distal end portion 8A. It is formed in the bottomed cylindrical shape provided with the wall surface 8e.
At the end of the cylindrical portion 8B connected to the tip portion 8A, a stopper 8f that restricts the movement of the piston portion 9 described later in the axial direction protrudes from the inside of the cylindrical inner peripheral surface 8d.
Further, a discharge port 10 penetrating in the thickness direction of the tubular portion 8B is provided at a position below the tubular portion 8B and at an intermediate portion in the axial direction.
In the present embodiment, the shape of the discharge port 10 in a side view (view A in FIG. 1) includes a long side extending in the axial direction of the accumulator portion 8 and a short side extending in the circumferential direction, as shown in FIG. It consists of a rectangle.

The piston portion 9 is a member that is provided inside the accumulator portion 8 so as to be able to advance and retreat along the axial direction of the accumulator portion 8, thereby forming a variable volume storage space S inside the accumulator portion 8.
In the present embodiment, disk-shaped moving walls 9a and 9c that are slidably fitted on the cylindrical inner peripheral surface 8d, and a connecting shaft 9b that connects the moving walls 9a and 9c with a certain distance therebetween in the axial direction. With.
The moving wall 9a is disposed at a position facing the tip portion 8A inside the accumulator portion 8. Further, the moving wall 9c is arranged at a position facing the proximal side inner wall surface 8e inside the accumulator portion 8.

  With such a configuration, the inside of the accumulator portion 8 is surrounded by the moving wall 9a, the cylindrical inner peripheral surface 8d from the moving wall 9a to the tip portion 8A, and the inner peripheral surface 8a of the tip portion 8A. A storage space S, which is a created space, is formed. Further, the inside of the accumulator portion 8 is surrounded by a moving wall 9c, a cylindrical inner peripheral surface 8d from the moving wall 9c to the base end side inner wall surface 8e, and a base end side inner wall surface 8e. A pressure chamber P that is a space is formed.

The volumes of the storage space S and the pressure chamber P vary depending on the position of the piston portion 9 in the axial direction. In the present embodiment, when the piston 9 moves to a position where the moving wall 9a contacts the stopper 8f, the volume of the storage space S is minimized and the volume of the pressure chamber P is maximized.
For this reason, the inflow port 8b and the supply port 8c are not closed by the piston part 9 even if the piston part 9 moves to the most distal end side, and are opened toward the storage space S. Therefore, the kneaded material M moved through the moving pipe 7 can flow into the storage space S through the inflow port 8b.

Further, when the piston portion 9 moves to a position where the moving wall 9c contacts the proximal end inner wall surface 8e, the volume of the storage space S is maximized and the volume of the pressure chamber P is minimized.
In the accumulator unit 8, a heater for preventing the kneaded material M from being cured is provided at least in a range where the storage space S is formed.

In the present embodiment, by appropriately setting the length of the connecting shaft 9b and the installation position of the discharge port 10, the discharge port 10 is located between the moving walls 9a and 9c when the piston portion 9 moves to the most distal side. The moving wall 9a passes over the discharge port 10 when the piston portion 9 moves to the proximal end side.
For this reason, when the moving wall 9 a passes over the discharge port 10, the storage space S communicates with the outside through the discharge port 10.
On the other hand, since the moving wall 9c does not pass over the discharge port 10 in the entire movement range of the piston portion 9, the pressure chamber P is not communicated to the outside through the discharge port 10. For this reason, the pressure chamber P is kept airtight in the entire movement range of the piston portion 9.

With such a configuration, the volume of the storage space S is variable depending on the movement position of the piston portion 9, and the kneading material M flowing in from the inflow port 8b is moved to the moving line 7 through the supply port 8c. The kneaded material M can be temporarily stored.
However, when the moving wall 9a moves on the discharge port 10, even if the discharge port 10 is partially exposed to the storage space S and an opening is formed, the kneaded material M in the storage space S It is discharged to the outside through the discharge port 10 that forms.
In this embodiment, since the discharge port 10 is provided on the lower side of the accumulator unit 8, the kneading material M is moved downward from the discharge port 10 by the internal pressure of the storage space S and the gravity acting on the kneading material M. Discharged.
Therefore, a material recovery unit 11 that recovers the discharged kneaded material M is disposed below the discharge port 10.

The pressurizing unit 20 supplies air at a constant pressure to the pressure chamber P, and includes an air supply unit 23 that is an air supply source, a regulator 22 that maintains the air pressure at a constant pressure, and a controller that operates the regulator 22. 24 and a conduit 21 for introducing the air supplied from the regulator 22 into the pressure chamber P. One end of the pipe line 21 is connected to the regulator 22, and the other end is connected to the accumulator unit 8 so as to open to the base end side inner wall surface 8 e.
The constant pressure of the pressurizing unit 20 moves in accordance with the increase or decrease of the kneading material M stored in the storage space S, with the kneading material M moved to the storage space S closely contacting with the moving wall 9a of the piston unit 9. Set to the size you want.

Next, the operation of the kneading extrusion molding apparatus 50 will be described.
3 (a), 3 (b), and 3 (c) are operation explanatory diagrams of the kneading extrusion molding apparatus according to the embodiment of the present invention.

When the raw material m is introduced into the material inlet 5a of the kneading section 1 and the motor 3 is driven to rotate the kneading screw 4, the raw material m is repeatedly sheared in the gap between the inner surface of the kneading cylinder 5 and the kneading screw 4. Thus, the kneaded material M having fluidity is formed.
The kneading material M moves toward the kneading outlet 6 as the kneading screw 4 rotates. In this process, the kneading further proceeds, reaches the kneading outlet 6 in a state where the composition is uniform, and is pushed out from the kneading outlet 6 toward the moving pipe 7.
In such a kneading step by the kneading part 1, the amount of the raw material m and the kneading conditions such as the time, speed, temperature and pressure of the kneading greatly affect the kneadability and physical properties of the kneaded material M. The kneading part 1 is continuously operated within an allowable range of kneading conditions determined according to the composition of the kneading material M. Therefore, even if the supply amount of the raw material m and the kneading conditions of the kneading unit 1 are changed, the supply amount of the kneading material M cannot be changed greatly.

Since the kneaded material M that has moved to the moving pipe 7 is kept warm by the heater of the moving pipe 7, it flows along the moving pipe 7 and flows into the storage space S from the inflow port 8b. At this time, in the initial state, the piston portion 9 has advanced to the position of the stopper 8f, and the volume of the storage space S is minimum.
When the infused kneading material M fills the storage space S, the kneading material M flows into the moving pipe 7 from the supply port 8 c and is supplied to the gear pump 13. The gear pump 13 increases the amount necessary for extrusion molding to a necessary pressure and pumps it to the die part 14.
Thereby, the kneading material M is continuously extruded from the die part 14. The extruded kneaded material M is cooled and solidified to produce an extruded product 16.

In the extrusion molding unit 15, the pressure applied to the kneaded material M from the gear pump 13, the feeding speed of the kneaded material M, the supply amount, the temperature, and other extrusion conditions greatly influence the moldability and molding quality of the extrusion molding. For this reason, it is preferable that the kneading material M having a substantially constant pressure (including a constant case) is supplied to the storage space S while the extrusion molding unit 15 performs the molding.
In the present embodiment, the operating condition of the kneading unit 1 is set so that the kneading material M having a minimum volume or more is stored in the storage space S in consideration of the consumption of the kneading material M in the extrusion molding unit 15.
For this reason, the amount of the kneaded material M to be stored in the storage space S changes according to the net inflow amount of the kneaded material M after subtracting the amount consumed in the extrusion molding unit 15.

In this embodiment, when the kneading material M increases, the moving wall 9a is pressed by the kneading material M, and the piston portion 9 moves in the axial direction until the pressure of the pressure chamber P received by the moving wall 9c is balanced.
For example, as shown in FIG. 3 (c), the piston unit 9 is moved proximally, storage space S is expanded to a larger storage space S ₁ than the minimum volume, mixing materials M to the storage space S ₁ Is stored. In the present embodiment, since the pressure chamber P is a constant pressure by the regulator 22, the pressure of the kneaded material M in the storage space S ₁ also becomes constant.

If the net inflow amount of the kneaded material M continues to be greater than 0, the kneaded material M in the storage space S increases, so that the piston portion 9 moves further to the base end side according to the increased amount.
In this way, when the movement of the piston portion 9 retreating to the proximal end continues, the moving wall 9a moves to a position overlapping the discharge port 10 as shown in FIG. ₂ is formed. At this time, a portion of the discharge port 10 is exposed in the storage space S _2, openings are formed on the lower side of the storage space S _2.
As a result, the kneaded material M in the storage space S ₂ falls by its own weight through the opening by the discharge port 10 and is discharged below the accumulator unit 8. The discharged kneaded material M falls into the material recovery unit 11 and is recovered.
Thereby, the inflow of net kneaded material M to the storage space S in the ₂ decreases, the moving speed of the moving wall 9a is reduced.

In the present embodiment, since the discharge port 10 has a rectangular shape elongated in the axial direction, the opening area of the opening portion increases in proportion to the moving amount when the moving wall 9a moves to the proximal end side. The discharge amount corresponding to the opening area increases linearly.
However, as shown in FIG. 3C, when the moving wall 9 a moves to the base end side with respect to the discharge port 10, the opening area of the opening becomes maximum, and the kneaded material M is discharged from the entire opening of the discharge port 10. Will be.
Thus, as the discharge amount from the discharge port 10 increases, the net inflow amount of the kneaded material M decreases accordingly.
When the net inflow amount becomes zero, the movement of the piston portion 9 stops.
Here, for example, when the supply amount from the kneading unit 1 decreases or the consumption amount in the extrusion molding unit 15 increases, the net inflow amount of the kneading material M becomes negative, and the internal pressure of the storage space S decreases. To do.
In this case, the piston portion 9 moves to the tip side due to the pressure difference between the pressure chamber P and the storage space S. When the moving wall 9a passes through the discharge port 10 and closes the discharge port 10 or moves to the tip side from the discharge port 10, the discharge from the discharge port 10 stops. For this reason, for example, the state returns to the state shown in FIG.

Thus, according to the kneading extrusion molding apparatus 50, even if there is a difference between the supply amount of the kneading material M by the kneading unit 1 and the consumption amount of the kneading material M in the extrusion molding unit 15, the kneading unit 1 and the extrusion molding unit. The kneaded material M can be stored in a variable-volume storage space S of the accumulator unit 8 provided between the two. The kneaded material M stored in the storage space S can be used for extrusion molding when the consumption of the extrusion molding unit 15 increases.
For this reason, it is not necessary to operate the kneading unit 1 in accordance with the amount of the kneading material M consumed in the extrusion molding unit 15, so that the kneading unit 1 operates under the optimum kneading conditions for the kneading material M. Thus, the kneaded material M with good quality can be manufactured.
Further, since the volume of the storage space S is variable, the pressure change of the kneaded material M in the storage space S hardly occurs, and the kneaded material M having a substantially constant pressure can be supplied to the gear pump 13 of the extrusion molding unit 15. . For this reason, the extrusion molding unit 15 can perform stable extrusion molding.

Further, according to the kneading extrusion molding apparatus 50, since the discharge port 10 is provided in the intermediate portion in the axial direction of the accumulator unit 8, for example, even if the inflow state of the kneading material M is not monitored by a pressure sensor, a flow meter or the like. When a certain amount or more of the kneaded material M flows into the storage space S, the discharge is started immediately from the discharge port 10. Moreover, since the discharge amount from the discharge port 10 changes when the moving wall 9a moves according to the change of the inflow amount of the kneaded material M, the discharge amount control becomes unnecessary.
For this reason, even if the supply and demand balance of the kneaded material M changes and the storage capacity of the storage space S is exceeded, the pressure of the kneaded material M is kept substantially constant, so that kneading and extrusion can be continued smoothly. it can. Further, in the kneading extrusion molding apparatus 50, for example, the apparatus configuration such as a pressure sensor, a flow meter, a discharge valve, and a discharge amount control means is not required, so that the apparatus configuration is simplified as compared with a conventional apparatus including these. It has become.

Variations in the supply amount and consumption amount of the kneading material M by the kneading unit 1 and the extrusion molding unit 15 can be divided into fluctuations during normal operation and fluctuations at the time of abnormality that occur when an abnormality such as a device trouble occurs.
For this reason, it is preferable that the position of the discharge port 10 is set so that the volume in the accumulator portion 8 on the tip side of the discharge port 10 can absorb the fluctuation during normal operation.
In this case, in the range of fluctuation during normal operation, the kneaded material M can be stored without discharging the kneaded material M from the discharge port 10, so that the kneaded material M can be used without waste during normal operation. It can be performed.
Moreover, it is preferable to set the opening area of the discharge port 10 to an opening area where a discharge amount equal to or more than the net inflow amount due to fluctuations at the time of abnormality is obtained. For example, in order to cope with an abnormality in which the operation of the extrusion molding unit 15 suddenly stops due to an apparatus trouble, the net inflow amount is ensured by setting the opening area of the discharge port 10 to an opening area larger than the inflow port 8b. Can be suppressed.
In this case, when the moving wall 9a moves to the base end side from the discharge port 10 and the discharge port 10 is fully opened, the movement of the piston portion 9 is stopped and the pressure of the kneaded material M in the storage space S is increased. Therefore, it is possible to prevent damage to the accumulator unit 8 and damage to the extrusion molding unit 15.

[First Modification]
Fig.4 (a) is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 1st modification of embodiment of this invention.

In the said embodiment, although the example in the case of the planar view shape of the discharge port 10 having a rectangular shape was demonstrated, an appropriate shape can be employ | adopted for the planar view shape of the discharge port 10. FIG.
The kneading extrusion molding apparatus 51 of this modification is provided with the discharge port 30 instead of the discharge port 10 of the said embodiment, as shown in FIG.
Hereinafter, a description will be given focusing on differences from the above embodiment.

As shown in FIG. 4A, the discharge port 30 has an oval shape whose plan view shape extends in the axial direction.
For this reason, the discharge port 30 discharges the kneaded material M to the outside of the accumulator unit 8 in the same manner as in the above embodiment, only when the moving wall 9a passes through the semicircular portions at both ends. can do.
However, since the rate of change of the opening area when the moving wall 9a passes through the semicircular portion is smaller than that of the rectangular shape, the discharge amount is gradually changed and the sudden pressure change in the storage space S is suppressed. Can do.

[Second Modification]
FIG.4 (b) is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 2nd modification of embodiment of this invention.

The kneading extrusion molding apparatus 52 of this modification is provided with the discharge port 31 instead of the discharge port 10 of the said embodiment, as shown in FIG.
Hereinafter, a description will be given focusing on differences from the above embodiment.

  The discharge port 31 has an isosceles triangle shape in plan view, the symmetry axis of the isosceles triangle is parallel to the axial direction of the accumulator unit 8, and the vertex on the symmetry axis is directed to the tip side of the accumulator unit 8. Is formed.

According to the discharge port 31, when the moving wall 9a passes from the distal end side (the right side in FIG. 4B) toward the proximal end side (the left side in FIG. 4B), the opening area increases. The rate is small at first, and the difference is that the opening area increases in proportion to the square of the amount of movement as the movement proceeds, and the kneaded material M is discharged out of the accumulator unit 8 in the same manner as in the above embodiment. Can do.
Therefore, since the change of the opening area when the moving wall 9a passes is initially small compared to the rectangular shape, the discharge amount does not increase suddenly, and the rapid decompression in the storage space S is suppressed. Can do. Further, since the opening area rapidly increases as the moving amount of the moving wall 9a increases, the kneaded material M can be discharged efficiently even if the moving amount of the moving wall 9a is slight.

  In addition, although the example of the isosceles triangle was demonstrated as an example of the shape of the discharge port 31 in the modification, it is not limited to this. For example, an appropriate triangular shape in which one vertex is arranged on the distal end side and the other two vertices are located on the proximal end side can be adopted.

[Third Modification]
Fig.5 (a) is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 3rd modification of embodiment of this invention.

In the above embodiment, an example in which one discharge port 10 elongated in the axial direction is described, but the discharge port may not be elongated in the axial direction, and the number is not limited to one.
As shown in FIG. 1, the kneading extrusion molding apparatus 53 of this modification includes a discharge port 32 shown in FIG. 5A in place of the discharge port 10 of the above embodiment.
Hereinafter, a description will be given focusing on differences from the above embodiment.

The discharge port 32 is different from the discharge port 10 in that the shape in plan view is circular, and the discharge port 32 is configured by a plurality of circular holes 32a provided apart from each other.
The arrangement of the circular holes 32a may be a square lattice or a staggered lattice. Further, the arrangement pitch may be constant, may be changed regularly, or may be an irregular pitch.
Further, the inner diameter of the circular hole 32a may be larger or smaller than the width of the moving wall 9a, but in this modification, the inner diameter is smaller than the width of the moving wall 9a.

  The discharge port 32 is different from the above embodiment only in that the discharge amount of the kneaded material M is changed by changing the number of the circular holes 32a located in the storage space S according to the movement amount of the moving wall 9a. Similarly, the kneaded material M can be discharged to the outside of the accumulator unit 8.

[Fourth Modification]
FIG.5 (b) is sectional drawing which shows the discharge port used for the kneading | mixing extrusion molding apparatus of the 4th modification of embodiment of this invention.

As shown in FIG. 1, the kneading extrusion molding apparatus 54 of the present modification includes a discharge port 33 shown in FIG. 5A in place of the discharge port 10 of the above embodiment.
Hereinafter, a description will be given focusing on differences from the above embodiment.

In the discharge port 33, elongated holes 33 a, 33 b, 33 c, 33 d, and 33 e having an elliptical shape whose plan view shape extends in the axial direction are arranged in parallel to each other.
In the long holes 33a, 33b, 33c, 33d, and 33e, the positions of the respective one end portions on the base end side of the accumulator portion 8 are aligned, and the axial opening length to the other end portion is changed.
In this modification, as an example, the opening length of the long hole 33c provided at the center is the longest, the opening lengths of the long holes 33b and 33d adjacent to the long hole 33c are the second longest, and the long hole 33a adjacent to these. 33e is the shortest opening length. Thereby, the slit group distributed inside the isosceles triangular area | region similar to the said 2nd modification as a whole is comprised.

According to the discharge port 33, as the moving wall 9a moves from the distal end side to the proximal end side, the long holes 33c, the long holes 33b and 33d, and the long holes 33a and 33e appear in the storage space S sequentially, thereby opening the opening area. The kneaded material M can be discharged to the outside of the accumulator unit 8 in the same manner as in the above embodiment only by changing.
For this reason, since the opening area accompanying the movement of the moving wall 9a shows substantially the same change as the second modified example, it has the same operational effects as the second modified example.

  In the above description of the embodiment and each modification, an example in which the pressure chamber P is set to a constant pressure by the regulator 22 has been described. However, in the extrusion molding unit 15, the pressure applied to the kneaded material M in the storage space S Even if there is a fluctuation, stable and good extrusion can be performed as long as there is no problem in the pressure increasing operation by the gear pump 13. Therefore, the pressure in the storage space S does not need to be controlled to a strictly constant value, and may have a fluctuation range that does not hinder extrusion molding.

  In the description of the embodiment and each modification, the pressure chamber P is set to a constant pressure by the regulator 22, but the means for keeping the pressure constant is not limited. For example, a constant pressure pressing mechanism that applies a constant pressure load using gravity acting on the weight may be employed.

Moreover, in the description of the above embodiment and each modification, in order to press the piston portion 9, an example in which the internal pressure of the pressure chamber P provided in the accumulator portion 8 is changed by the air pressure as the pressurizing portion. As described above, the pressurizing unit may be configured to change a gas pressure other than the air pressure, or may be configured to pressurize with a liquid.
Furthermore, the pressurizing unit is not limited to the configuration in which the piston portion 9 is pressurized via the pressure chamber P, and may be configured to mechanically pressurize via a pressing rod or the like.
In this case, the accumulator portion 8 may be a cylindrical member that can move the piston portion 9 back and forth, and the pressure chamber P is unnecessary. Therefore, the accumulator part 8 may be comprised with the cylindrical member by which the base end side was open | released.

  In addition, all the constituent elements described in the above embodiment and each modification can be implemented by being appropriately combined or deleted within the scope of the technical idea of the present invention.

DESCRIPTION OF SYMBOLS 1 Kneading part 7 Movement pipe line 8 Accumulator part 8a Inner peripheral surface 8b Inlet 8c Supply port 8d Cylindrical inner peripheral surface 8e Base end side inner wall surface 8A Tip part 8B Cylindrical part 9 Piston part 9a, 9c Moving walls 10, 30 , 31, 32, 33 Discharge port 13 Gear pump 14 Die part 15 Extrusion part 16 Extrusion product 20 Pressurization part 22 Regulator 23 Air supply part 50, 51, 52, 53, 54 Kneading extrusion molding apparatus m Raw material P Pressure chamber S , S ₁ , S ₂ , S ₃ storage space

Claims (4)

A kneading extrusion molding apparatus comprising a kneading part for kneading raw materials to form a kneaded material and an extrusion molding part for pumping the kneaded material to a die part for extrusion molding,
A moving line connected between the kneading part and the extrusion molding part and moving the kneaded material from the kneading part to the extrusion forming part;
A cylindrical accumulator portion that is provided in an intermediate portion of the moving pipe and stores the kneaded material being moved;
A piston portion provided inside the accumulator portion so as to be capable of moving back and forth in the axial direction, thereby forming a variable volume storage space inside the accumulator portion;
A pressurizing part that pressurizes the piston part so as to move following the increase / decrease of the kneaded material stored in the storage space, in close contact with the kneaded material moved to the storage space;
A discharge port provided through the side of the accumulator unit in a region where the volume of the storage space is equal to or greater than a certain value;
A kneading extrusion molding apparatus comprising: The pressurizing part is
The kneading extrusion molding apparatus according to claim 1, wherein the piston portion is pressurized at a constant pressure. The outlet is
The kneading extrusion molding apparatus according to claim 1, wherein the kneading extrusion molding apparatus has an elongated opening shape in the axial direction. The outlet is
The kneading extrusion according to any one of claims 1 to 3, wherein an opening amount in a circumferential direction orthogonal to the axial direction has an opening shape that gradually increases in a retracting direction of the piston portion with respect to the storage space. Molding equipment.

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