JPH05220818A - Single-spindle extruder - Google Patents

Abstract

PURPOSE:To improve the biting properties of a material, and to increase encroaching capacity by rotatably constituting the cylinder section of the supply compression section of a single-spindle extruder, dividing the rotary section into one or two or more and separately rotating the rotary sections. CONSTITUTION:A single-spindle extruder has a supply compression section, in which a resin material fed from a material charging port 2 is melted in a cylinder 1 and a molten resin is extruded to the front end side by the revolution of a screw 3, and the front end side of the supply compression section is provided with a compression melting section and a kneading weighing section. The cylinder section 1 of the supply compression section is organized rotatably and used as a rotary section 10 at that time, the rotary section 10 is divided into two split revolution bodies 11, 12, and the revolution of the revolution bodies can be controlled separately through worm wheels 23. Medium paths 31, 32 are formed to each rotary section 11, 12, and a medium such as water, oil, etc., is flowed through medium outlets 35, 36 from medium inlets 33, 34 respectively, thus separately controlling each rotary section 11, 12 at a fixed temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-screw extruder which is capable of obtaining a high extrusion ability even when a synthetic resin material is extruded and having a poor bite, and which is stable with time.

[0002]

BACKGROUND OF THE INVENTION When a synthetic resin material is extrusion-molded, generally, a material having a small apparent specific gravity such as a material having a large porosity, a crushed material, a recycled material, etc. are not well bited and the extrusion amount is lowered. In addition, the extrusion condition became unstable over time, and a good product could not be extruded efficiently.

In order to efficiently extrude good products,
Various attempts have been made to improve extrusion conditions such as resin temperature and screw rotation speed, change the shape of the screw itself, improve the grain shape of the raw material, and granulate to increase the apparent specific gravity. Is.

However, even with various attempts as described above, the extrusion efficiency is 2 even for a material having a large apparent specific gravity.
It is produced at about 0 to 40%, and in some cases, the extrusion amount may be considerably unstable, and further improvement is desired.

On the other hand, as described above, even if the above-mentioned various improvement measures are taken for a material having a poor bite such as a material having a small apparent specific gravity, the bite cannot be made good, The screw efficiency, that is, the extrusion rate was low, and the product quality could not be improved.

[0006] In order to solve the above-mentioned problems, an extrusion molding machine is proposed in which the bite of the material is improved by the twin-screw extruder, but the number of screws increases and the structure becomes complicated. In addition to an expensive extruder, there is a problem that the quality characteristics of the material cannot be maintained, and further improvement is desired.

[0007]

2. Description of the Related Art Conventionally, as a single-screw extruder of this type intended to improve the bite of the molding material, (a) Japanese Patent Publication No. 60-8.
Those described in Japanese Patent No. 935, (b) Japanese Patent Publication No. 51-272
The one described in Japanese Patent No. 72 is known.

In the conventional example (a), a plurality of grooves extending in the axial direction are formed on the inner peripheral surface of the cylinder supply compression section, and the screw extending over the supply compression section and the compression melting section is continuously increased. A flight of threads (thread) is formed, and the depth of the screw groove of this multi-flight flight is 6 to 12% of the outer diameter of the screw. According to such a structure, there is an advantage that the frictional force between the resin material and the inner peripheral surface of the cylinder of the supply compression section increases, and the material feeding ability in the supply compression section increases.

In the conventional example (b), the diameter of the supply compression section of the cylinder is increased and the diameter of the compression-melting section is decreased to form a taper between them, and a screw is provided on the inner surface of the cylinder of the supply compression section. Screw thread (flight)
A multi-threaded groove in the opposite direction to that of the screw, and the screw thread of the screw is a saw-toothed screw type, and the screw thread (flight) of the screw and the inner peripheral surface of the cylinder supply compression section are sufficiently It is formed by forming a gap. With such a structure, materials (scraps) for hollow moldings such as bottles and large containers made of high-foaming thermoplastic resin can be eaten in the above-mentioned sufficient space, and The thread and groove of the screw and the tooth of the screw reach the tapered portion while being melted by sufficiently intruding the material in the extrusion direction, and the material reaches the end of the tapered portion. It is divided and pushed out downstream. Therefore, in the conventional example (b), only a large capacity material can be extruded.

[0010]

However, in both (a) the above-mentioned conventional examples (a) and (b), the feed compression section of the cylinder and the shape of the screw are taken into consideration in consideration of the biteability of the material. As described above, by adopting a special structure and selecting the screw rotation speed and temperature conditions according to the characteristics of the material, the material is properly bited and the material feeding capacity in the supply compression section is increased. .. Therefore,
Even when the same material is used, the biting property of the screw is adjusted as described above, such as when the biting property changes with time and the extrusion amount changes, or when different materials with different biting properties are used. There is no alternative but to change the rotation speed or the temperature. Every time the rotation speed or the temperature is changed, the molding operation is stopped and restarted, so that the extrusion amount of the molded product is small and the production capacity is lowered. In other words, there is a drawback that the operating time is shortened.

(B) In the conventional examples (a) and (b), when it is difficult to cope with the problem by controlling the rotation speed and temperature of the screw as described above, for example, a material having a poor biting property can be obtained with a high extrusion efficiency. In order to produce stably, it is necessary to change the design of the pitch of the screw and the groove depth, which requires a troublesome work. And in this case,
Also in the compression-melting section and the kneading / measuring section, it is necessary to change the structure in accordance with the design change of the screw pitch and the like, and the cost becomes high.

(C) In the conventional example (a), since the multiple threads are formed in the screw extending over the supply compression section and the compression-melting section, less material enters from the material input port. Therefore, if the number of rotations of the screw is increased to increase the supply amount, the balance with the kneading / measuring section is lost, and it is necessary to correct the screw size to match it. Alternatively, the groove of the multiple flight, that is, the flight height may be increased, but the flight height is limited. Therefore, there is a limit in stably improving the extrusion rate.

(D) In the conventional example (b), since a sufficient gap is formed between the screw thread (flight) of the screw and the inner peripheral surface of the cylinder supply compression section, the large-capacity scraps mentioned above are formed. In the case of granular materials that are not equal,
In the gap portion, there is a problem that the biting by the flight of the screw is deteriorated and the extrusion capability is lowered.

The present invention has been made by paying attention to the problems of the above-mentioned conventional examples (a) and (b), and the cylinder portion of the supply compression section of the single-screw extruder is configured to be rotatable. By continuously controlling the frictional force between the resin material and the inner peripheral surface of the cylinder to improve the biteability of the material and improve the extrusion capacity, it is possible to eliminate all the above problems. is there.

[0015]

In order to solve the above-mentioned problems, according to the present invention, a cylinder portion of a feed compression section of a single-screw extruder is rotatably formed, and the rotating portion is
It is characterized in that it is configured so that it can be rotated individually by dividing into one or two or more. One or two
The rotating parts divided into three or more can be controlled by independent rotating speed and surface temperature, which are most suitable for the rotating conditions of the screw, etc., to set the optimum conditions in the feed compression section of the single-screw extruder. ..

The rotating part has one or more elements, and the length of each element can be formed corresponding to every several pitches of the screw, and the length of each element may be the same or different. Good.

The rotating portion is constructed so that it can rotate at an arbitrary number of rotations in the same direction as the screw rotating direction or in the opposite direction. When the rotating portion is divided into two or more parts, each divided rotating body is configured to be rotatable in either the same direction or the opposite direction at an arbitrary number of rotations. That is, not only all of the plurality of divided rotary bodies can rotate in the same direction or the opposite directions, but also normal-reverse-forward-reverse, forward-reverse-reverse-
In addition to being able to rotate in any combination such as ...
An arbitrary number of them can be stopped and rotated, for example, reverse-stop-reverse ..., and can be rotated in an arbitrary direction by many other combinations. Moreover, the rotation speed of each of these divided bodies can be arbitrarily selected.

The rotating portion of the cylinder portion of the supply compression section can be heated or cooled by a temperature adjusting means comprising a heating means such as induction heating, an electric heater, a heat medium, air blow, or a cooling means. By the temperature adjusting means, the temperature of the inner peripheral surface of the rotating portion of the cylinder portion of the supply compression section,
By raising or lowering in consideration of the characteristics of the material, it is possible to increase the frictional force (friction coefficient) of the material, improve the biting of the material, and increase the extrusion amount.

The inner peripheral surface of the cylinder portion in the supply compression section is
A smooth surface may be used, or a plurality of grooves may be formed in the axial direction or the orthogonal direction of the screw as is well known.

A liner made of a material or shape capable of always maintaining a constant coefficient of friction with respect to the material is provided on the inner peripheral surface of the cylinder portion of the supply compression section, and the material is formed between the inner peripheral surface of the liner and the outer peripheral surface of the screw. It is more preferable to transfer. When such a liner is provided, a large number of liners made of materials or shapes having different friction coefficients are prepared, and a liner having an optimum friction coefficient is selected according to the characteristics of the material to be extrusion-molded, It can be a rotating part (divided rotor) in the cylinder part of the supply compression section, and can be replaced with a liner having a different friction coefficient, which is extremely convenient.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 5 is a schematic vertical cross-sectional view of a single-screw extruder according to the present invention. This single-screw extruder has a cylinder 1 having a material input port 2 at its base and a resin material supplied from the material input port 2. A screw 3 that melts in the cylinder 1 and extrudes to the tip side, a heater 4 that heats the cylinder 1, a driving means 5 such as a motor 6 and a reduction gear 7 for rotating the screw 3, and melts and extrudes. The die 8 and the like give a predetermined shape to the material. A hopper (not shown) is attached to the material input port 2 and the material is supplied from the hopper.

The screw 3 is a single flight type screw having flights (threads) 3a with an arbitrary pitch, but any other screw can be used. The screw 3 includes a supply compression section A for compressing and transferring the resin material made of powdery or granular material (solid) supplied from the material input port 2 while preheating it, and a supply compression section A.
It comprises a compression and melting section B for compressing and plasticizing and melting the material transferred from, and a kneading and measuring section C for kneading and measuring and extruding the molten material from the compression and melting section B. In this embodiment, it is divided into three sections, but it is also possible to divide into four sections or more. 3s is the surface of the screw groove.

The cylinder portion 1a corresponding to the supply compression section A of the screw 3 is rotatably formed, and the rotating portion 10 is constructed so that it can be individually rotated by dividing it into one or two or more parts. is there.

As shown in FIG. 2, when the rotating portion 10 is divided into two or more parts, the divided rotating bodies 11, 12 ...
Are capable of rotating in mutually the same direction or in opposite directions at an arbitrary rotation speed. That is, the rotation direction of each of the divided rotary bodies 11, 12, ... Can be reversed with respect to the rotational direction of the screw 3 and both the first divided rotary body 11 and the second divided rotary body 12 ... , Can be rotated in different directions such as forward and reverse directions, and various other combinations. The rotational speed of each of the divided rotary bodies 11, 12, ... Is in the opposite direction to the rotation of the screw 3, and the rotational speed of the first divided rotary body 11 is 10 to 20% of the rotational speed of the screw 3.
It was preferable that the divided rotary body 12 be rotated under the condition that the rotation ratio of the former is higher than that of the latter by about 5 to 15%.
Of course, this rotation speed can be arbitrarily selected.

Although the rotating portion 10 is not shown in the figure, it may be one, and in this case as well, it can rotate in the same direction as the rotating direction of the screw 3 or in the opposite direction, and the number of rotations is the same as that of the first rotating portion.
The rotation ratio can be the same as that of the divided rotary body 11.

The rotation of the rotating portion 10 includes a state in which the rotation is stopped, that is, the number of rotations is 0, regardless of whether the rotating portion 10 is one or two or more.

It is generally preferable that the rotating portions (10, 11, 12, ...) Rotate in the opposite direction to the rotating direction of the screw 3. This is because the coefficient of friction of the material with respect to the inner peripheral surface of the cylinder portion 1a is increased, the bite of the material is improved, the transport pressure in the supply compression section A is also increased, and the material extrusion capacity is improved.
If the coefficient of friction of the material with respect to the inner peripheral surface of the cylinder portion 1a is increased, the rotating portion (10, 11, 12)
The rotation direction of () is preferably the same direction as the rotation direction of the screw 3 or may be rotated in an appropriate direction such as alternating forward and reverse.

As shown in FIGS. 2 and 3, the divided rotating bodies 11 and 12 forming the rotating portion 10 of the cylinder portion 1a are both formed in a tubular shape, and the outer circumferences of the tubular bodies 13 and 14 are formed. An outer case 17 is covered via bearings 15 and 16. Reference numeral 17a is a lid of the outer case 17.

The inner peripheral surface of each of the divided rotary bodies 11 and 12 can be constructed so as to directly face the screw 3. However, in this embodiment, the inner circumferential surface faces indirectly through the liners 20, 20. The liners 20, 20 are rotated together with the divided rotary bodies 11, 12.

The liner 20 is preferably made of a material or a shape which can always maintain a constant friction coefficient with respect to the molding material. As the material, for example, a sintered material containing fluorine resin or the like is preferable. Further, as the shape, a liner 20 having a plurality of grooves 21 as shown in FIGS.

The rotating means for rotating the rotating portion 10 (the two divided rotating bodies 11 and 12 in the embodiment) may have an arbitrary structure, but in this embodiment, the worm as shown in FIGS. 2 and 3 is used. It uses a gear unit. That is,
The rotating means 22 in FIG.
A worm wheel 23 fixed to the worm wheel 23, a worm 24 having a tooth 24a that meshes with a tooth 23a of the worm wheel 23, and an end of a shaft 25 of the worm 24,
The drive source 26 rotates the shaft 25 to rotate the worm wheel 23 (the drive source on the side of the divided rotating body 11 is not shown). By the forward and reverse operation of the drive source 26, each divided rotary body 1 is passed through the worm gear device.
Each of 1 and 12 can independently rotate in the same direction as the rotation direction of the screw 3 or in the opposite direction at a desired rotation speed. In FIG. 3, 27, 28 and 29 are bearings.

Rotating part 10, that is, divided rotating bodies 11 and 12
Is heated or cooled by the temperature control means 30 as shown in FIGS. As the temperature adjusting means 30, in this embodiment, as shown in FIGS. 2 and 3, the heat medium is used to cool or heat the cylinder portion 1a which is the rotating portion 10. That is, the medium passages 31 and 32 are formed inside the cylindrical bodies 13 and 14 that form the divided rotary bodies 11 and 12, and the medium such as water or oil is introduced into the medium passages 31 and 32 from the medium inlets 33 and 34. Then, the cylinder portion 1a which is the rotating portion 10 is cooled or heated by the medium and then returned to the medium tank (not shown) outside the system through the medium outlets 35 and 36. Instead of the temperature control means 30 using the heat medium, it is possible to use heating means such as induction heating or an electric heater, or cooling means such as a blower for cooling.

FIG. 6 shows another modification of the cylinder portion 1a of the supply compression section A of the single screw extruder. The cylinder portion 1a of FIG. 6 is rotatable, and the rotating portion 10 is formed of two divided rotating bodies 11 and 12 so that they can be rotated independently of each other. Common with.

However, the two divided rotary bodies 1 of FIG. 6 are
Nos. 1 and 12 have the former flight 3a having 4 pitches and the latter flight 3a having 3 pitches, and have different axial lengths, and the rotating means 22 of both of the divided rotary bodies 11 and 12 are directly driven by the drive source 26. 1 to FIG. 5 in that the temperature control means 30 is not provided in the cylinder portion 1a of both of the divided rotary bodies 11 and 12. ..

The number of divided rotating bodies 11 and 12 is not limited to two as in the embodiment, but three or more can be provided. In FIGS. 1, 2 and 6, reference numerals 40 to 46 are sealing materials.

In the inner peripheral surface of the rotating portion 10 (divided rotors 11, 12, ...) When the liner 20 is not interposed as in the embodiment, the friction coefficient does not change with time due to the adhesion of the resin material. A surface-treated material is preferable.

[0037]

The operation of the above embodiment will be described below with reference to FIGS. 1 to 5 and 7. A series of flow from the time of feeding the material to be molded to the time of taking it out as a molded product will be briefly described with reference to FIG. Figure 5
In, when the motor 6 is driven to rotate the screw 3 clockwise at a predetermined rotation speed, the material to be molded supplied from the material inlet 2 is supplied to the supply compression section A while being compressed by the action of the screw 3. Compressed and melted section B
Is transferred to the kneading and metering section C, and is kneaded in the kneading and metering section C to measure a predetermined amount per unit time and then extruded into the die 8. After being formed into a predetermined shape in 8, the product is taken out as a molded product by a take-up device through a cooling process.

Split rotary body 1 in the supply compression section A
The functions of 1 and 12 will be described in more detail. In this case, for example, the rotation of the screw 3 is opposite to the rotation of the divided rotary bodies 11 and 12, and the rotation speed is, for example, 20 to 10 in the former case.
0 rpm, the latter 1-10 rpm. Material input port 2
If the friction coefficient with the inner peripheral surface of the divided rotary body 11 is μb ₁ and the friction coefficient of the surface 3s of the screw groove is μs ₁ , the material charged more than that is in a state of μb ₁ ≧ μs _1. For example, when the material passes through the gap between the inner peripheral surface of the cylinder of the divided rotary body 11 and the screw groove surface 3s of the screw 3, an extrusion pressure ΔP corresponding to the magnitude of the shear rate γ ₁ of the material is generated, The material is transferred while being compressed downstream. That is, screw 3 from material input port 2
The material filled in the groove is affected over the axial length of the divided rotary body 11, and the supply amount and the compression amount of the material are determined on the condition of the friction coefficient and the shear rate, and the steady state is achieved.

As described above, when the divided rotary body 11 is rotated in the opposite direction to the screw 3 and the friction coefficient of the divided rotary body 11 is μb ₁ ≧ μs ₁ and the shear rate γ ₁ of the material is a certain value or more, As shown in the experiment of FIG. 7, the pressure Δp of the material in the region of the divided rotary body 11 of the present invention rises at a slightly higher pressure than at the time of rising compared to the conventional example. This slight rising pressure has an extremely important function because it becomes an initial condition for exponentially increasing the pressure of the material on the downstream side.

The material whose pressure is increased by the divided rotary body 11 is also applied to the next divided rotary body 12 in the same manner as described above.
Friction coefficient μb ₂ of the inner peripheral surface of the cylinder of the divided rotary body 11 and friction coefficient μ _s2 of the screw groove surface 3s of the screw 3
_{Has a} relation of μb ₂ ≧ μ _s2 , and the shearing speed γ _{2 of the} transfer received when passing through the gap between the inner peripheral surface of the divided rotary body 12 of the material and the screw groove surface 3s of the screw 3 is When adjusting the rotation speeds of the divided rotary body 11 and the divided rotary body 12 so as to satisfy the condition of being smaller than or equal to the shear rate γ ₁ in the divided rotary body 11 (γ ₂ ≦ γ ₁ ), the material is on the downstream side. Is transferred while being compressed. Material pressure Δp in the region of the divided rotating body 12
As shown by the solid line in FIG. 7, in addition to the action unique to the divided rotary body 12, it is further exponentially increased by being affected by the initial rising pressure in the region of the divided rotary body 11 described above. As shown by the solid line in FIG. 7, this pressure increase is in the initial stage of the compression-melting section B (that is, the maximum pressurizing point P _F (MAX)).
The pressure is the same as that in the conventional example in which the cylinder does not rotate until the end of the kneading / measuring section C.

From the maximum pressurization point P _F (MAX) to the die 8, the coefficient of friction of the outer peripheral surface of the screw, the coefficient of friction of the inner peripheral surface of the cylinder, the shear rate of the material, the screw depending on the compression state of the material Compression, pressurization, and discharge are performed by a general extrusion screw theory determined by flight (twist angle and screw groove height) and the like.

As described above, in the present invention, the screw 3 is rotated, and at the same time, the divided rotors 11 and 12 are rotated.
When rotating (see the solid line in FIG. 7), as compared with the conventional single-screw extruder in which only the screw 3 rotates, as described above, the friction of the inner peripheral surface of the cylinder of the divided rotors 11 and 12 is By increasing the coefficient and the shear rate acting in the screw groove on the material, the transport pressure on the material is sharply increased, so that at least the feed compression section A
It is possible to improve the bite of the material in step (1) and to stably supply the material and to stably transfer the material to the next step.

That is, in FIG. 7, from the time when the material is charged into the material charging port 2 to the maximum pressure rising point P _F (MAX), in the conventional example, in the supply compression section A as shown by the curve of C. It shows a gradual pressure gradient.
On the other hand, in the present invention, in the supply compression section A, as shown by the curve a, the divided rotary bodies 11 and 12 are divided.
Since the pressure is sharply increased by the action of, the pressure not only becomes higher than the pressure in the conventional example, but also the pressure gradient shows a steep curve, so that the bite of the material in the supply compression section A is improved as described above. Therefore, the supply amount is stable, and it is stably transferred to the next process.

When the divided rotors 11 and 12 are rotated at the same number of revolutions as in the case of the solid line a and the number of revolutions of the screw 3 is increased from that in the case of the solid line a, the pressure of the material in this case is as shown in FIG. as indicated by the two-dot chain line b, the maximum boost point P _`F
(MAX) can be raised. With this as a branch point, the upstream side shows a steep rising pressure curve, and the downstream side shows a gentle falling pressure curve.
Even if the pressure in the die is increased by the amount corresponding to the increase in the maximum pressure increase point P _FF (MAX) in the supply compression section A, stable compression supply of the material is promised, so the extrusion capacity is improved and stable extrusion production is achieved. Guaranteed. The number of revolutions of the screw is limited by the heat generation of the material resin and the material flow rate limitation in the die, but there is a limit, but the rotation adjusting means of the divided rotors 11 and 12 can improve the stable production capacity, The effect is recognized to be a capacity improvement of 35 to 85%.

The friction coefficient, the rotation direction, and the rotation speed of the inner peripheral surfaces of the divided rotary bodies 11 and 12 are determined according to the material to be formed. Moreover, the friction coefficient is the divided rotary body 1
It can be adjusted to increase or decrease depending on the shape of the inner peripheral surface of Nos. 1 and 12, material, temperature, or the like. Then, by adjusting the shear rate of this material, it is as if the twist angle of the screw 3 were changed and adjusted, and the movement angle of the material with respect to the screw groove is changed. As a result, there is a remarkable advantage that the screw 3 has the function of freely changing the flight shape and groove depth. The effect is 3 days ~
A practical example in a production site where continuous operation is required for 30 days is shown and viewed. In general, the average amount of extrusion from the start of the extruder changes slowly with time. For example, in 10 consecutive days of operation, the average amount of extrusion is about 8 to 16% of the amount of extrusion at the start of operation. It is accepted to change. In such a case, in the conventional apparatus in which the cylinder in the material supply compression section does not rotate, the extrusion amount is adjusted by the rotation speed and temperature of the screw, but in order to prevent deterioration of product quality I had to stop the operation around 10 days. Therefore, the production operation rate is lowered and the yield is lowered, and improvement is desired. According to the present invention, it is possible to automatically control the rotation speed of the divided rotary bodies 11 and 12 in the supply compression section automatically, and it is possible to improve the productivity.

[0046]

According to the present invention, (1) the cylinder portion of the feed compression section of the single-screw extruder is rotatably formed, and the rotating portion is divided into one or two or more and individually rotated. Since it is configured to rotate, the friction coefficient of the inner peripheral surface of the rotating portion (divided rotor) can be set by rotating the rotating portion (divided rotor) in the same or opposite direction as the screw rotation direction at an arbitrary number of revolutions. As a result, the shearing speed of the material is increased, and the biting ability of the material is improved.As a result, even if the material has poor biting such as a material having a small apparent specific gravity, or if the biting property changes over time and the extrusion rate changes, At least the feed of the material in the feed compression section is improved and the feed amount is supplied stably, and the extrusion performance is enhanced, and the extrusion molding process is continuously performed for a long time without lowering the quality of the molded product. You can work. Conventional example (a),
In (b), the only way to adjust the biting property of the material is to change the screw rotation speed or the cylinder temperature.Stop the molding operation and restart the operation every time the rotation speed or temperature is changed. Therefore, the operating time is short and the production capacity is reduced. Also, in order to adjust the biteability of material, when changing the rotation speed of the screw or the temperature of the cylinder,
There are drawbacks such as deterioration of the quality of the molded product due to the physical properties of the molding material. INDUSTRIAL APPLICABILITY The present invention can control the extrusion amount of a material by a simple operation of adjusting the direction and size of the rotation of the rotating portion (divided rotating body) without changing the rotation of the screw, and all of the above-mentioned drawbacks. It can be resolved.

(2) As described in claim 4, the rotating portion of the cylinder portion of the supply compression section is heated or cooled by the temperature adjusting means so that the friction coefficient of the inner peripheral surface of the rotating portion (divided rotor) is increased. It is possible to enhance the biteability of the material and increase the extrusion amount.

(3) As described in claim 5, the inner peripheral surface of the cylinder portion of the supply compression section is provided with a liner made of a material or a shape capable of always maintaining a constant friction coefficient with respect to the material, and liners having different friction coefficients are provided. By preparing a large number of, it is possible to replace the liner, maintain the optimum biteability, and maintain the optimum extrusion capacity.

[Brief description of drawings]

FIG. 1 is a partially enlarged vertical sectional view of FIG.

FIG. 2 is a longitudinal sectional view of an essential part of an embodiment of the present invention.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is an overall schematic vertical sectional view to which the present invention is applied.

FIG. 6 is a vertical cross-sectional view showing a modified example of a rotating portion (divided rotating body).

FIG. 7 is a diagram showing the pressure of the material in each section of the screw.

FIG. 8 is a partial cross-sectional view of a first modified example of the liner.

FIG. 9 is a partial cross-sectional view of a second modified example of the liner.

FIG. 10 is a partial cross-sectional view of a third modified example of the liner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 1a Cylinder part of a supply compression section 2 Screw 8 Dice 10 Rotating part 11 Dividing rotator 12 Dividing rotator 20 Liner 22 Rotating means 30 Temperature adjusting means 31 Medium passage 32 Medium passage 33 Medium inlet 34 Medium inlet 35 Medium outlet 36 Medium exit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Osamu Matsui 6-526 Tanimachi, Chuo-ku, Osaka City, Osaka Prefecture

Claims (5)

[Claims] 1. A cylinder portion 1a of a feed compression section A of a single-screw extruder is rotatably formed, and this rotating portion 10 is constructed so that it can be individually rotated by dividing it into one or two or more parts. A single-screw extruder characterized by being present. 2. The single-screw extruder according to claim 1, wherein the rotating portion 10 is configured to be rotatable at an arbitrary number of rotations in the same direction as the rotating direction of the screw 3 or in the opposite direction. 3. When the rotating portion 10 is divided into two or more parts, the divided rotating bodies 11, 12 ... Can rotate at the arbitrary number of revolutions either in the same direction or in opposite directions. The single-screw extruder according to claim 1, which is configured as follows. 4. The single screw extruder according to claim 1, wherein the rotating portion 1a of the cylinder portion of the supply compression section A is heated or cooled by the temperature adjusting means 30. 5. The liner 20 made of a material or shape capable of always maintaining a constant coefficient of friction with respect to a material is provided on the inner peripheral surface of the cylinder portion 1a of the supply compression section A. The single-screw extruder described in.