JPH10244531A - Continuous kneading machine, material-discharging method therefor and rotor for continuous kneading machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the quality of a product by minimizing a difference in temperature in an axial direction of a rotor for a kneaded material that is discharged from a discharge port without narrowing the operating conditions of a continuous kneading machine. SOLUTION: A continuous kneading machine comprises a chamber 2 having a material supply port 13 at one end thereof, a rotor 4 having feed ports 18, 20 for a material to be kneaded and a kneading section 19 on the circumferential portion thereof and rotatably inserted into the chamber 2 while being supported at axial ends thereof, a discharge section 27 formed at the other end of the rotor 4 for scraping out a kneaded material kneaded by the rotor 4 in a radially outward direction of the rotor, and a discharge port 15 formed at the other end portion of the chamber 2 so as to be open radially outwardly of the rotor for discharging the kneaded material scraped out at the discharge section 27. The discharge section 27 of the rotor 4 is formed into a shape such that the shearing work done by virtue of the rotation thereof relative to a kneaded material reduces towards the other end of the axial direction of the rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous kneader for kneading a polymer resin material such as plastic or rubber, a method for discharging the material, and a rotor of the continuous kneader.

[0002]

2. Description of the Related Art The above-mentioned continuous kneading machine is usually a rotor which rotates at high speed in different directions and applies a strong shearing action to a material to be kneaded such as a plastic or rubber material to plasticize and melt in a short time. Various kinds of resin products can be manufactured by mixing and dispersing various fillers and additives efficiently into the molten resin.

In particular, a continuous kneader having a double-supported structure in which both ends in the axial direction of a rotor are supported by bearings can rotate the rotor at a high speed because the rotor does not come in contact with the tip and the tip does not contact the chamber. In addition, there is a feature that a kneading and granulating equipment having a high production capacity can be easily configured. And among the continuous kneaders of the both-ends support type, the twin-rotor twin-screw continuous kneader has a feed portion and a kneading portion on the outer peripheral surface of a material to be kneaded in a chamber having a material supply port at one end. A pair of left and right rotors are rotatably inserted while supporting both ends in the axial direction, and the other end of each rotor is provided with a discharge portion (for discharging the kneaded material kneaded by the rotors in a radially outward direction). A discharge port for discharging the kneaded material scraped at the discharge portion to the outside of the chamber is formed at the other end of the chamber so as to open in a radially outward direction of the rotor ( For example, Japanese Patent Publication No. 58-5053
No. 3, JP-B-6-41135).

[0004]

As described above, in the twin-screw continuous kneader of the double-end support type, the front end of the chamber cannot be opened and the discharge port must be opened in the radial direction of the rotor. The kneaded material flowing toward the downstream side in the axial direction of the rotor in the chamber reaches a portion corresponding to a discharge port (hereinafter referred to as a discharge region) in the chamber and is discharged by a discharge portion (discharge blade) of the rotor. In the radial direction, and the flow direction thereof is changed substantially at right angles from the axial direction of the rotor.

In this case, in the conventional twin-screw continuous kneader, the amount of protrusion of the discharge portion of the rotor is set to be the same in the axial direction of the rotor, so that the clogging occurs between the inner surface of the chamber and the discharge portion of the rotor. In some cases, the temperature of the kneaded material increases due to the shearing force associated with the rotation of the rotor, and the temperature of the kneaded material at the outlet becomes non-uniform in the axial direction of the rotor.

That is, when the kneaded material flowing in the axial direction of the rotor is discharged radially outward of the rotor at the downstream end of the chamber, the flow immediately exits from the upstream of the discharge port to the outermost downstream of the chamber. Since there is a flow that stays in the discharge area and then flows to the outside, for example, as shown in FIG. 14, the flow rate distribution of the kneaded material at the discharge port becomes smaller toward the downstream side (the right side in FIG. 14).

[0007] On the other hand, since the kneaded material is usually filled in the resin pipe connected to the discharge area and the discharge port in the chamber, when the amount of protrusion of the discharge portion of the rotor is the same in the axial direction of the rotor, In this case, the amount of shearing work that the kneaded material present in the discharge region receives from the discharge blades as the rotor rotates is hardly changed in the axial direction of the rotor. As described above, the shear work applied to the kneaded material per unit weight is substantially constant although the flow rate distribution of the kneaded material in the discharge area is smaller toward the downstream side, so that the amount of shear work applied to the kneaded material per unit weight is reduced. It becomes larger toward the downstream side of the exit. Therefore, as shown in the upper graph of FIG. 14, a relatively large temperature difference ΔT occurs between the upstream and downstream resins of the kneaded material passing through the discharge port.

When a large temperature difference ΔT is generated in the molten resin at the outlet as described above, even if a kneaded material having a desired temperature is obtained on the upstream side of the outlet, the temperature of the kneaded material is obtained on the downstream side of the outlet. Is too high, a part of the kneaded material is decomposed and the quality may be degraded, and the length of pellets extruded from a subsequent die (granulator) becomes uneven due to a difference in viscosity due to a temperature difference. In some cases.

On the other hand, in the invention described in Japanese Patent Application Laid-Open No. Hei 9-1630, as means for preventing the resin temperature from being uneven at the discharge port as described above, the downstream end of the rotor is connected to the discharge section (discharge blade). It is recommended to be formed in a non-cylindrical shape (see claim 1 of the publication). However, if all of the discharge section is removed from the downstream end of the rotor to make it round, the function of scraping out the resin in the discharge area will be completely lost, so the rotor must be raised to secure the pumping force of the molten resin. The operation must be performed by rotation, and the operating conditions of the continuous kneader become narrow. In this case, a part of the kneaded material may remain in the discharge area and deteriorate.

In view of such circumstances, the present invention minimizes the temperature difference in the rotor axial direction of the kneaded material discharged from the discharge port without narrowing the operating conditions of the continuous kneader. The purpose is to improve product quality.

[0011]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is,
According to the present invention, the discharge section of the rotor is formed in a shape in which the amount of shearing work given to the kneaded material by the rotation thereof decreases toward the other end in the rotor axial direction (claim 1).

In this case, the amount of shearing work given to the kneaded material in the discharge region by the rotation of the rotor gradually decreases toward the other end (downstream side) in the rotor axial direction. The shear work added to the kneaded material flowing downstream of the outlet with a smaller discharge flow rate is smaller than the shear work applied to the kneaded material flowing upstream of the more outlet, thereby, The shearing work per unit weight applied to the kneaded material flowing in the discharge port is substantially equalized in the rotor axial direction.

Further, in the present invention, unlike the case of Japanese Patent Application Laid-Open No. 9-1630, the discharge portion of the rotor is not completely removed, so that the resin scraping function in the discharge region is prevented from being reduced as much as possible. Can be. The discharge portion is generally constituted by one or a plurality of discharge blades protruding in the radial direction of the rotor and extending in the rotor axial direction,
In order to cause the discharge section to perform the above-described operation, for example, FIG.
As shown in FIG. 8, the number of blades of the discharge blade may be decreased stepwise toward the other end in the rotor axial direction (Claim 2), or as shown in FIG. What is necessary is just to form in the shape which asymptotically increases as it goes (claim 3).

In the case of a discharge section having a plurality of discharge blades protruded at intervals in the circumferential direction of the rotor, a part of the plurality of discharge blades is formed in the shape described above. ,
It is preferable that the remaining discharge blades extend in the same direction as in the related art so that the cross-sectional shape does not change in the rotor axial direction (claim 4). In this case, since the number of blades is not reduced or the tip clearance is increased for all of the plurality of discharge blades, at least one of the discharge blades has a conventional shape whose cross-sectional shape does not change. The discharge blades can ensure the function of scraping out the resin in the entire rotor axial direction of the discharge region, prevent the resin discharge capability from being reduced due to forming the other discharge blades as described above, and keep the resin in the discharge region. Deterioration due to stagnation can be prevented.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention. In this embodiment, the present invention is applied to a two-rotor twin-screw continuous kneader among various continuous kneaders. As shown in FIG. 4, the twin-screw continuous kneader 1 employed in this embodiment includes a chamber 2 as an apparatus main body,
In the chamber 2, two continuous kneading chambers 3 each having a substantially cylindrical shape in the longitudinal direction are formed so as to communicate with each other so as to have a substantially eyeglass shape in cross section.

In each kneading chamber 3 of the chamber 2, the material to be kneaded is fed from one end side (upstream side, right side in FIG. 4) of the chamber 2 to the other end side (downstream side, left side in FIG. 4). A pair of left and right rotors 4, 4 for kneading and melting the same material in the middle thereof are inserted parallel to each other and rotatably.
Both ends in the axial direction of each of the rotors 4 and 4 are rotatably supported via bearings (bearings) 5, 6 and 7 provided on both the upstream and downstream sides of the chamber 2.

A driving device 8 for the rotor 4 is connected to a downstream end of the chamber 2. The driving device 8 includes a casing 9 tandemly connected to a downstream end of the chamber 2.
And a pair of front and rear bearings 5 and 6 for rotatably supporting the drive shafts 10 of the rotors 4 and 4 inserted into the casing 9, and a drive fixed to a halfway portion of the drive shaft 10 in the axial direction. And a gear 11.

The drive shaft 10 of one of the pair of rotors 4, 4 protrudes further upstream of the casing 9, and its protruding end is connected to a motor 12 with a speed reducer. The drive gears 11 of the rotors 4 and 4 are directly meshed with each other. Therefore, when one of the rotors 4 is driven to rotate by the motor 12, the other rotor 4 rotates in a different direction.

A supply port 1 for supplying powdery material to be kneaded to the kneading chamber 3 is provided on the upper surface side of the upstream end of the chamber 2.
A hopper (not shown) is connected to the supply port 13. A vent hole 14 is formed in an intermediate portion of the chamber 2 for degassing gas generated during kneading from the kneading chamber 3 or for performing post-addition of an additive such as an inorganic filler.

A discharge port 15 for discharging the molten and kneaded material to the outside of the chamber 2 is provided on the lower surface side of the downstream end of the chamber 2. In this embodiment, this discharge port is provided. 15 adopts a downward discharge type that opens downward in the radial direction of the rotor 4. Further, a gate device 17 that adjusts the flow rate of the material to be kneaded by moving the pair of upper and lower gate plates 16 closer to or away from the outer peripheral portion of the rotor 4 from the radial outside is provided at an intermediate portion in the material transport direction of the chamber 2. The kneading chamber 3 in the chamber 2
The upstream and downstream sides of the gate device 17 are divided into two kneading stages 3A and 3B arranged in tandem.

Among these, on the outer peripheral surface of the rotor 4 inserted into the first stage 3A on the upstream side of the gate device 17, the powdery material to be kneaded from the supply port 13 is sequentially fed from the upstream side. A first feed portion 18 composed of a screw blade for feeding and a kneading portion 19 for kneading and melting the powdery material to be kneaded by applying a strong shearing force to the material are formed.

The kneading section 19 has a feed wing section 19A twisted in a direction for pushing the material to be kneaded downstream by the rotation of the rotor 4, and a return blade twisted in a direction to push the material to be kneaded upstream by the rotation. And wings 19B. On the other hand, the outer peripheral surface of the rotor 4 inserted into the second stage 3B on the downstream side of the gate device 17 includes screw blades for forcibly transporting the material melted in the kneading unit 19 to the discharge port 15 side. Although the second feed unit 20 is provided,
No kneading section is provided on the downstream side. In addition, when forming a 2nd kneading part downstream of the 2nd feed part 20,
In some cases, only the second kneading section is formed without forming the second feed section 20.

A gear pump 22 (see FIGS. 5 to 7 described later) is connected to the lower side of the discharge port 15 through a connecting pipe 21. The discharge side of the gear pump 22 has a pelletizer (granulating device) and the like. Is connected. Thus, the twin-screw continuous kneader 1, the gear pump 22 and the granulating device constitute a continuous kneading and granulating system of a polymer resin material.

As shown in FIG. 1, the downstream end of the rotor 4 projects through the chamber 2 through a visco seal 23, and the projecting portion constitutes the downstream end surface of the chamber 2. The downstream bearing 7 fixed to the vertical wall portion 24 rotatably supports the chamber 2.
The visco-seal 23 is provided with a seal tube portion 25 provided so as to penetrate the downstream end surface of the chamber 2, and is slidably inserted into the seal tube portion 25 and provided on the outer peripheral surface of the downstream end portion of the rotor 4. And the formed reverse screw portion 26 is formed in a direction in which the screw thread moves to the upstream side when the rotor 4 rotates.

For this reason, the kneaded material that has entered the sealing cylinder portion 25 from the kneading chamber 3 is returned to the upstream side by the reverse feeding action of the reverse screw portion 26, and thereby, the rotary sliding portion of the rotor 4 is rotated. Sealing of the kneaded material is ensured. As shown in FIGS. 1 and 4, on the outer peripheral surface of the downstream end of each rotor 4, there is provided a discharge unit 27 that scrapes out the kneaded material that has been kneaded and melted in the kneading unit 19 of the rotor 4 in a radially outward direction. Is formed. The discharge unit 27 is provided in the kneading chamber 3
Are formed to have the same length as the rotor axial direction range (discharge area 28) in which the discharge port 15 is formed or slightly longer than that.

As shown in FIG. 3 (a), the discharge portion 27 is composed of a short cylindrical discharge segment 29 which is spline-fitted to the outer peripheral portion of the shaft body 4A constituting the core of the rotor 4. 29, three discharge blades 3 projecting radially outward at intervals of 120 degrees in the circumferential direction.
0, 31, 32 are formed. These three discharge wings 3
0, 31, and 32 have the same amount of protrusion in the radially outward direction, but are formed so as to have different extension lengths in the rotor axis direction. The discharge blades 30, 31, and 32 are formed in such a shape that the number of blades gradually decreases toward the downstream side (the right side in FIG. 2) in the rotor axial direction.

That is, as shown in FIG. 2, all three discharge blades 30, 31, and 32 extend in parallel with the rotor axis direction from the connection point with the second feed portion 20 (the upstream end 28A of the discharge region 28). Among them, the first discharge blade 30 whose extension length is the shortest is formed to have a length approximately one-third of the length of the discharge region 28 in the rotor axial direction. The second discharge blade 31 having a shorter length is formed to have a length substantially equal to two thirds of the length of the discharge region 28 in the axial direction of the rotor. It is formed in length.

However, the number of blades of the discharge portion 27 is 3 at the upstream portion in the rotor axial direction of the discharge portion 27, 2 at the middle portion in the same direction, and 1 at the downstream portion in the same direction (FIG. ) ~
(C)), the number of blades gradually decreases toward the downstream side in the rotor axial direction. Note that, as shown in FIG. 3C, the circumferential phase angle θ of the discharge unit 27 is shifted by 60 degrees on the left and right.

At the time of kneading the material to be kneaded by the twin-screw continuous kneader 1 having the above structure, first, a powdery material to be kneaded (which may contain an inorganic filler) is supplied from the supply port 13. Then, in the first stage 3A, the material is fed to the downstream side by the first feed unit 18 and receives a large shearing force when passing through the tip portion of the kneading unit 19 to be melted by self-heating.

Thereafter, the melted kneaded material reaches the second feed section 20 of the second stage 3B while the kneading degree (temperature) is adjusted by the gate device 17, and the feed section 20
Is pushed out to the discharge area 28 by the screw action of
The gas is discharged to the outside of the chamber 2 from the discharge port 15 opened below the region 28. At this time, in the present embodiment, since the number of blades of the discharge portion 27 decreases stepwise toward the downstream side in the rotor axial direction, each of the discharge blades 30, 31, and 32 mixes the kneaded material with the rotation of the rotor 4. Is gradually decreased toward the downstream side in the rotor axial direction.

Therefore, the shearing work applied to the kneaded material flowing downstream of the outlet 15 having a smaller discharge flow rate is smaller than the shearing work applied to the kneaded material flowing upstream of the outlet 15 having a larger discharge flow rate. Is smaller, the shearing work per unit weight applied to the kneaded material flowing in the outlet 15 is substantially equalized in the rotor axial direction, and a large temperature difference between the upstream side and the downstream side of the outlet 15 Would be prevented from occurring.

As described above, in the present embodiment, the outlet 15
Since the resin temperature in the inside can be made almost uniform, it is possible to prevent the deterioration of the kneaded material due to an unexpected rise in temperature, thereby improving the quality of the final product and preventing the pellet length from becoming uneven. Become. Also, outlet 1
5, the resin temperature in the gate device 5 can be made substantially uniform.
7, the kneading degree can be easily adjusted by controlling the suction pressure of the gear pump 22.

Further, in this embodiment, three discharge blades 3
0, 31, and 32, the third discharge blade 32 does not change its cross-sectional shape in the axial direction of the rotor, and the discharge region 28 does not change.
The third discharge blade 32 secures the resin scraping function over the entire discharge area 28 in the rotor axial direction. For this reason, a reduction in the resin discharge capacity due to the shortening of the other first and second discharge blades 30 and 31 is prevented as much as possible, and a part of the resin stays in the discharge region 28. It is possible to prevent continuous deterioration.

Further, as described above, the problem of non-uniform temperature at the discharge port of the twin-screw continuous kneader 1 of the double-sided support type can be solved by the present invention. Therefore, various connection structures with the gear pump 22 can be adopted. FIGS. 5 to 7 show variations of the connection structure between the chamber 2 and the gear pump 22 which can be applied to the twin-screw continuous kneader 1 employing the present invention.

In FIG. 5A, a horizontally arranged gear pump 22 is directly connected to the lower surface of the chamber 2 having the downward discharge port 15, and in FIG.
An L-shaped pipe 35 is connected to the lower surface of the chamber 2 having the 5, and the gear pump 22 arranged vertically is directly connected to the pipe 35. In FIG. 6A, the discharge port 15 is also inclined in relation to the rotor 4 being inclined, and a gear pump 22 arranged vertically is connected to the inclined discharge port 15.
In FIG. 6B, the discharge port 15 is opened in the horizontal direction in relation to the vertical orientation of the rotor 4, and a gear pump 22 arranged vertically is connected to the discharge port 15. FIG.
In (c), a horizontal outlet 15 is formed in the chamber 2 having the rotor 4 arranged horizontally, and a gear pump 22 arranged vertically is connected to the outlet 15.

FIG. 7 shows a connection structure in the case where the left and right kneading chambers 3 in the second stage 3B are made independent of each other. In FIG. 7A, the outlet 15 communicating with each kneading chamber 3 is also inclined because the rotor 4 is inclined, and the elbow pipe 36 connected to the inclined outlet 15 is vertically oriented. The gear pump 22 of the arrangement is directly connected.
Further, in FIG. 7B, the discharge ports 1 communicating with the respective kneading chambers 3 are shown.
5 are respectively opened on the left and right side surfaces of the chamber 2, and a vertically arranged gear pump 22 is provided in each of the kneading chambers 3.
7 respectively.

FIGS. 8 and 9 show a second embodiment of the present invention. This embodiment is the same as the first embodiment in that the discharge section 27 includes three discharge blades 30, 31, and 32, but the shearing work applied to the kneaded material toward the downstream side in the rotor axial direction. Is different from that of the first embodiment.

That is, in the present embodiment, the first and second discharge blades 30 and 31 are formed so as to taper so that the protruding height gradually decreases toward the downstream side (the right side in FIG. 8). The tip clearances of the discharge blades 30 and 31 are asymptotically increased toward the downstream side in the rotor axial direction. Therefore, also in the present embodiment, in discharging the kneaded material from the discharge port 15, the shearing work given to the kneaded material by the rotation of the rotor 4 gradually decreases toward the downstream side in the rotor axial direction. The operation of this point is the same as that of the first embodiment.

Also in this embodiment, the projecting height of the third kneading blade 32 is constant over the entire length, thereby ensuring the scraping function over the entire discharge area 28 in the rotor axial direction. FIG. 10 shows a third embodiment of the present invention. This embodiment shows a case where the present invention is applied to a single kneading type twin-screw continuous extruder having no gate device 17 (for example, KCM and NCM series of Kobe Steel Ltd.).

For this reason, in the first embodiment (FIG. 4) and the present embodiment (FIG. 10), the kneading chamber 3 is divided into two stages by the gate device 17 in the former, but is one stage in the latter. Is different. In this embodiment, as a means for adjusting the degree of kneading, not the gear pump 22 but a flapper orifice 40 comprising a lid member 38 pivotally attached to the discharge port 15 and a cylinder 39 for swinging the lid member 38.
Is adopted.

However, the above-mentioned flapper orifice 40 can be employed in the two-stage type twin-screw continuous kneader 1 (FIG. 4) of the first embodiment. The gear pump 22 can be connected to 10). Since other basic structures are almost the same as those of the first embodiment, the same reference numerals are given to the drawings and detailed description of the structures is omitted.

While the embodiments of the present invention have been described above, these embodiments are illustrative and not restrictive. The technical scope of the present invention is determined by the appended claims, and all embodiments falling within the meaning are included in the scope of the present invention. For example, in the example shown in FIG.
Although all the members 7 have a length equal to or larger than the length of the outlet 15 in the rotor axis direction, the length may be slightly smaller than the length of the outlet 15 in the rotor axis direction.

The number of blades of the discharge section 27 is not limited to three but may be one.
The present invention is applicable not only to the parallel flight parallel to the axial direction of the rotor 4 but also to the inclined flight slightly twisted in the resin feeding or returning direction. can do. In each of the above-described embodiments, the twin-screw continuous kneader 1 in which the pair of rotors 4 rotate in different directions is exemplified. Can be adopted irrespective of the rotation direction and the number of the rotors 4.

That is, the present invention can be applied to a twin-screw continuous kneader in which a pair of rotors rotate in the same direction, a single-screw kneading extruder having one rotor, and a multi-screw kneading extruder having three or more rotors. .

[0045]

Next, examples (experimental examples) for verifying the effects of the present invention will be described. This experiment was carried out by actually kneading the material to be kneaded using the twin-screw continuous kneader 1 according to the first embodiment, and measuring the resin temperature at the discharge port 15 at that time. The common conditions for the test kneading are as follows.

Kneading machine used: LCM manufactured by Kobe Steel, Ltd.
100 (FIG. 4) Axial length of outlet: 90 mm Width of outlet: 180 mm Inner diameter of chamber: 108 mm Connection structure of gear pump: Structure of FIG. 11 Measurement point of temperature: Upstream point A of outlet of FIG.
Central point B, downstream point C Material to be kneaded: HDPE (MI = 0.08) (Experimental example 1) Under the above common conditions, the production amount was 300 kg.
/ H, rotor speed 400 rpm, gate opening 3 m
m, the inlet pressure of the gear pump is set to 3.5 kg / cm 2 and the discharge section 27 of the present invention shown in FIG.
Test kneading was performed for the three blades in the case where a conventional discharge unit extending to the downstream end face of the chamber was adopted, and the discharge port 15 was used.
The resin temperature at each of the points A to C was measured. FIG. 12 shows the result.

As can be seen from FIG. 12, when the resin temperature at the outlet is compared between the case of the present invention (▲) and the case of the conventional example (●), there is not much difference between the resin temperatures at the upstream point A. However, in the case of the present invention, the resin temperature is lower by about 20 ° C. at the intermediate point B and by about 30 ° C. at the downstream point C as compared with the conventional example, and the resin temperature in the discharge port is largely equalized. . (Experimental Example 2) The same test kneading was performed by changing the production amount to 400 kg / h, the rotor speed to 500 rpm, the gate opening to 3 mm, and the gear pump inlet pressure to 4.0 kg / cm2. The result is shown in FIG.

As is apparent from a comparison between FIG. 13 and FIG. 12, when the production amount and the rotation speed of the rotor are increased, the temperature at the downstream point C of the discharge port in the conventional example increases sharply. The rapid temperature increase at the downstream point C is well mitigated.

[0049]

As described above, according to the present invention,
The temperature difference in the rotor axis direction of the kneaded material at the discharge port can be reduced as much as possible while ensuring the resin scraping function in the discharge area. The deterioration of the kneaded material due to the unexpected temperature rise can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a downstream portion of a twin-screw continuous kneader according to a first embodiment.

FIG. 2 is a plan sectional view of the downstream portion.

3A is a cross-sectional view taken along the line AA of FIG. 2, and FIG.
3 is a sectional view taken along line BB of FIG. 2, and FIG. 3C is a sectional view taken along line CC of FIG.

FIG. 4 is a side sectional view showing the entire structure of the twin-screw continuous kneader according to the first embodiment.

FIG. 5 is a cross-sectional view showing a variation of the connection structure between the chamber and the gear pump.

FIG. 6 is a cross-sectional view showing a variation of a connection structure between a chamber and a gear pump.

FIG. 7 is a cross-sectional view showing a variation of the connection structure between the chamber and the gear pump.

FIG. 8 is a plan sectional view of a downstream portion of a twin-screw continuous kneader according to a second embodiment.

9A is a sectional view taken along line AA of FIG. 8, and FIG. 9B is a sectional view of FIG.
FIG. 9C is a sectional view taken along line BB of FIG. 8, and FIG.

FIG. 10 is a side sectional view showing the overall structure of a twin-screw continuous kneader according to a third embodiment.

FIG. 11 is a cross-sectional view showing a connection structure between a twin-screw continuous kneader and a gear pump employed in test kneading (an experimental example).

FIG. 12 is a graph showing a resin temperature distribution in an outlet.

FIG. 13 is a graph showing a resin temperature distribution in an outlet.

FIG. 14 shows the cause of temperature non-uniformity in the outlet.
It is a side sectional view of the downstream part of the conventional twin-screw continuous kneader.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 twin-screw continuous kneader 2 chamber 4 rotor 13 material supply port 15 discharge port 18 first feed section 19 kneading section 20 second feed section 27 discharge section 30 first discharge blade 31 second discharge blade 32 third discharge blade

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsunori Takahashi 2-3-1, Shinhama, Araimachi, Takasago-shi, Hyogo Inside Kobe Steel, Ltd. Takasago Works (72) Inventor Shigehiro Kasai 2-chome, Araimachi, Takasago-shi, Hyogo Prefecture No. 3-1 Kobe Steel, Ltd. Takasago Works (72) Inventor Tatsuya Tanaka 2-3-1, Shinhama, Araimachi, Takasago City, Hyogo Prefecture Kobe Steel Works, Takasago Works

Claims (7)

[Claims] 1. A feed section (18, 2) for a material to be kneaded is placed in a chamber (2) having a material supply port (13) at one end.
0) and a rotor (4) having a kneading portion (19) on its outer peripheral surface are rotatably inserted with both ends in the axial direction supported.
A discharge portion (27) for scraping the kneaded material kneaded by the rotor (4) in a radially outward direction is formed at the other end of the rotor (4), and is scraped by the discharge portion (27). A continuous kneading process is provided in which a discharge port (15) for discharging the mixed and kneaded material to the outside of the chamber (2) is formed at the other end of the chamber (2) so as to open radially outward of the rotor (4). The discharge portion (27) of the rotor (4) is formed in a shape such that the amount of shearing work given to the kneaded material by the rotation thereof decreases as it moves toward the other end in the rotor axial direction. And a continuous kneader. 2. The discharge section (27) includes one or a plurality of discharge blades (30 to 32) projecting radially outward of the rotor (4) and extending in the rotor axial direction.
2. The continuous kneader according to claim 1, wherein the number of blades in 2) is formed such that the number of blades decreases stepwise toward the other end side in the rotor axial direction. 3. The discharge section (27) includes one or a plurality of discharge blades (30 to 32) projecting radially outward of the rotor (4) and extending in the rotor axial direction.
2. The continuous kneader according to claim 1, wherein the tip clearance of 2) is formed in a shape that asymptotically increases toward the other end in the rotor axial direction. 3. 4. A discharge section (27) includes a plurality of discharge blades (30 to 32) protruding at intervals in a circumferential direction of a rotor (4).
A part (30, 31) of the plurality of discharge blades is formed in the shape according to claim 2 or 3, and the other discharge blades (32) have a cross-sectional shape in the rotor axial direction. A continuous kneader that extends in the same direction so that it does not change. 5. A feed section (18, 20) for a material to be kneaded.
And a kneading section (19) and a discharge section (27) for kneaded material on the outer peripheral surface, and the discharge section (27) is opened in a direction intersecting with the material conveying direction to form a discharge formed in the chamber (2). In the rotor of the continuous kneader (1) inserted into the chamber (2) in a state where both ends in the axial direction are rotatably supported so as to correspond to the outlet (15), the discharge part (27) Item 5. A rotor for a continuous kneader, wherein the rotor is formed in the shape described in any one of Items 1 to 4. 6. A rotor in which a material to be kneaded supplied from a material supply port (13) provided at one end of a chamber (2) is rotatably provided in the chamber (2) while supporting both ends in the axial direction. Kneading in (4) and the chamber (2)
To the other end side of the rotor (4), and the kneaded material is scraped out in a radial direction of the rotor (4) by a discharge portion (15) formed at the other end of the rotor (4), thereby forming the rotor (4). In a material discharging method for a continuous kneader, which is opened in a radially outward direction and is discharged from a discharge port (15) provided at the other end of the chamber (2), a discharge section (27) of the rotor (4) Discharges the kneaded material from the discharge port (15) while reducing the amount of shearing work given to the kneaded material by the rotation toward the other end side in the rotor axial direction. Discharge method. 7. The shearing work exerted on the kneaded material by the discharge part (27) by forming the discharge part of the rotor (4) into the shape according to any one of claims 2 to 4 in the axial direction of the rotor. The method for discharging a material in a continuous kneader according to claim 6, wherein the material is decreased toward the other end.