JP3530334B2 - Continuous kneader and rotor of continuous kneader - Google Patents

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 and a rotor of the continuous kneader.

[0002]

2. Description of the Related Art The above continuous kneading machine is a rotor which normally rotates in different directions at a high speed, and is capable of plasticizing and melting a material to be kneaded such as plastic or rubber material in a short time by applying a strong shearing action. By efficiently kneading various fillers and additives into the molten resin and mixing and dispersing them, it is possible to manufacture resin products of various qualities.

Particularly, in a continuous kneading machine having a double-supported structure in which both axial ends of the rotor are supported by bearings, the rotor does not come into contact with the chamber at the tip of the rotor, so that the rotor can rotate at a high speed. The feature is that kneading and granulating equipment with high production capacity can be easily configured. Among such continuous kneaders of both-end support type, a twin rotor type twin-screw continuous kneader has a feed part and a kneading part of the material to be kneaded on the outer peripheral surface in a chamber having a material supply port at one end. A pair of left and right rotors are rotatably inserted in a state of supporting both axial ends thereof, and at the other end of each rotor, a discharge portion for scraping out the kneaded material kneaded by the rotors in the radial outward direction ( A discharge vane) is formed, and a discharge port for discharging the kneaded material scraped out by the discharge part to the outside of the chamber is formed at the other end of the chamber so as to open radially outward of the rotor ( For example, Japanese Patent Publication No. 58-5053
3 gazette, Japanese Patent Publication No. 6-41135 gazette).

[0004]

As described above, in the double-end continuous kneader of the both-ends supporting type, the front end of the chamber cannot be opened, and the discharge port has to be opened radially outward of the rotor. The kneaded material flowing in the chamber toward the downstream side in the axial direction of the rotor reaches the portion corresponding to the discharge port in the chamber (hereinafter referred to as a discharge region) by the rotor discharge portion (discharge blade). Is squeezed out in the radial direction, and its flow direction is changed substantially at right angles from the rotor axial direction.

In this case, in the conventional twin-screw continuous kneading machine, the protrusion amount of the discharge portion of the rotor is set to be the same in the axial direction of the rotor, so that the inner surface of the chamber is clogged with the discharge portion of the rotor. The kneaded material that is being heated may be heated by the shearing force accompanying the rotation of the rotor, and the temperature of the kneaded material at the discharge port may become 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 outward in the radial direction of the rotor at the downstream end portion of the chamber, the flow immediately exits from the upstream portion of the discharge port to the most downstream portion of the chamber. Since there is a flow that stays in the discharge area and then exits 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 (right side in FIG. 14).

On the other hand, since the kneaded material is usually filled in the discharge region in the chamber and the resin pipe connected to the discharge port, when the protrusion amount of the discharge portion of the rotor is all the same in the axial direction of the rotor. In addition, the shearing work that the kneaded material existing in the discharge region receives from the discharge blades as the rotor rotates hardly changes in the axial direction of the rotor. In this way, in the discharge area, the flow rate distribution of the kneaded material is smaller toward the downstream side, but since the shear work applied to the same material is almost constant, the shear work added to the kneaded material per unit weight is eliminated. It will be larger toward the downstream side of the outlet. Therefore, as shown in the graph in the upper part of FIG. 14, a relatively large temperature difference ΔT occurs between the upstream and downstream resins of the kneaded material that passes through the discharge port.

When a large temperature difference ΔT occurs in the molten resin at the discharge port in this way, even if a kneaded product having a desired temperature is obtained on the upstream side of the discharge port, the temperature of the kneaded product on the downstream side of the discharge port. May become too high, and some of the kneaded material may decompose and the quality may deteriorate, and the pellets extruded from the subsequent die (granulator) may be uneven in length due to the difference in viscosity due to the temperature difference. In some cases.

On the other hand, in the invention described in Japanese Patent Application Laid-Open No. 9-1630, the downstream end of the rotor serves as a discharge part (discharge blade) as a means for preventing the uneven resin temperature at the discharge port as described above. It is recommended to form a non-cylindrical shape (see claim 1 of the same publication). However, if all the discharge part is removed from the downstream end of the rotor and it becomes a round boss, the function of scraping out the resin in the discharge area will be completely lost. Since it has to be operated by rotation, the operating conditions of the continuous kneader are narrowed. Further, 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 reduces the temperature difference in the axial direction of the rotor 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]

In order to achieve the above object, the present invention takes the following technical means. That is,
According to the present invention, the discharge portion of the rotor is formed in a shape in which the shearing work applied to the kneaded material due to its rotation decreases toward the other end side in the axial direction of the rotor.
It

In this case, since the shearing work given to the kneaded material in the discharge area by the rotation of the rotor gradually decreases toward the other end side (downstream side) in the axial direction of the rotor, the discharge flow rate is increased. The shear work added to the kneaded material flowing in the downstream part of the discharge flow with a smaller discharge flow amount is smaller than the shear work added to the kneaded material flowing in the upstream part of the discharge port with more The shearing work per unit weight applied to the kneaded material flowing through 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 deterioration of the resin scraping function in the discharge area should be avoided as much as possible. You can The discharge portion is usually constituted by one or a plurality of discharge blades that project radially outward of the rotor and extend in the rotor axial direction.
In order to make the discharge section have the above-mentioned effect, for example, as shown in FIG.
As shown in Fig. 8, the number of exhaust blades gradually decreases toward the other end side in the rotor axial direction, or as shown in Fig. 8, the tip clearance of the exhaust blade gradually asymptotically approaches the other end side in the rotor axial direction. It not good is formed to increase shape.

Further, in the case of a discharge portion provided with a plurality of discharge blades protruding at intervals in the circumferential direction of the rotor, a part of the plurality of discharge blades is formed in the shape as described above. ,
The other remaining discharge flights, not preferable that the cross-sectional shape as in the prior art to extend in the same direction so as not to change in the rotor axial direction. In this case, of all the plurality of discharge blades, at least one discharge blade is made to have the conventional shape in which the cross-sectional shape does not change, instead of reducing the number of blades or increasing the tip clearance for all of them. The discharge vanes can secure the resin scraping function in the entire discharge region in the axial direction of the rotor, and can prevent the deterioration of the resin discharge capacity due to the formation of the other discharge vanes as described above. Deterioration due to retention can be prevented.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION 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 used in this embodiment includes a chamber 2 as an apparatus main body,
In this 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 form an eyeglass hole shape in cross section.

Into each kneading chamber 3 of this 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). On the other hand, a pair of left and right rotors 4 and 4 for kneading and melting the same material are rotatably inserted in parallel with each other.
Both axial ends of the rotors 4, 4 are rotatably supported by bearings (bearings) 5, 6, 7 provided on both upstream and downstream sides of the chamber 2.

A drive device 8 for the rotor 4 is connected to the downstream end of the chamber 2. The drive device 8 includes a casing 9 connected in tandem at the downstream end of the chamber 2.
And a pair of front and rear bearings 5 and 6 that rotatably support the drive shaft portions 10 of the rotors 4 and 4 inserted in the casing 9, and a drive fixed to an intermediate portion in the axial direction of the drive shaft portions 10. The gear 11 is provided.

The drive shaft portion 10 of one rotor 4 of the pair of rotors 4 and 4 projects further upstream of the casing 9, and the projecting end portion is connected to a motor 12 with a reduction gear. The drive gears 11 of the rotors 4 and 4 are directly meshed with each other. Therefore, when one rotor 4 is rotationally driven by the motor 12, the other rotor 4 is rotated in a direction different from that.

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

A discharge port 15 for discharging the melted 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. The lower discharge type 15 is open downward in the radial direction of the rotor 4. Further, a gate device 17 for adjusting the flow rate of the material to be kneaded is provided at an intermediate portion in the material transport direction of the chamber 2 so that a pair of upper and lower gate plates 16 approaches or separates from the outer periphery of the rotor 4 from the radially outer side. The kneading chamber 3 in the chamber 2 is
The upstream side and the downstream side 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 which is inserted into the first stage 3A on the upstream side of the gate device 17, powdery materials to be kneaded from the supply port 13 are forwardly transferred in order from the upstream side. A first feed section 18 including a screw blade for feeding and a kneading section 19 for kneading and melting the powdery material to be kneaded by applying a strong shearing force are formed.

The kneading section 19 has a feed blade section 19A which is twisted in a direction to push the material to be kneaded to the downstream side by the rotation of the rotor 4 and a return blade which is twisted in a direction to push the material to be kneaded in the upstream side by the same rotation. It consists of wings 19B. On the other hand, the outer peripheral surface of the rotor 4 inserted in the second stage 3B on the downstream side of the gate device 17 is composed of screw blades for forcibly conveying the material melted in the kneading section 19 to the discharge port 15 side. The second feed section 20 is provided,
No kneading section is provided on the downstream side. In addition, when forming the second kneading section on the downstream side of the second feed section 20,
In some cases, only the second kneading section may be formed without forming the second feed section 20.

A gear pump 22 (see FIGS. 5 to 7 to be described later) is connected to the lower side of the discharge port 15 via a connecting pipe 21, and the discharge side of the gear pump 22 includes a pelletizer (granulator) and others. The final processing device is connected. Thus, the biaxial continuous kneading machine 1, the gear pump 22 and the granulating device constitute a continuous kneading and granulating system of the polymer resin material.

As shown in FIG. 1, the downstream end of the rotor 4 is projected through the chamber 2 via a Viscoseal 23, and the protruding portion constitutes the downstream end surface of the chamber 2. The downstream side bearing 7 fixed to the vertical wall portion 24 is rotatably supported on the chamber 2 side.
The viscoseal 23 is provided with a seal tube portion 25 provided so as to penetrate the downstream end surface of the chamber 2, and a slidable insertion into the seal tube portion 25 and an outer peripheral surface of the downstream end portion of the rotor 4. The reverse threaded portion 26 is formed in such a direction that the thread thereof moves to the upstream side when the rotor 4 rotates.

Therefore, the kneaded material that has entered the seal tube portion 25 from the kneading chamber 3 is returned to the upstream side by the reverse feed action of the reverse screw portion 26, whereby the rotary sliding portion of the rotor 4 is rotated. A seal for the kneaded material is ensured. As shown in FIGS. 1 and 4, on the outer peripheral surface of the downstream end portion of each rotor 4, there is provided a discharge portion 27 for scraping the kneaded material kneaded and melted in the kneading portion 19 of the rotor 4 outward in the radial direction thereof. Has been formed. The discharge unit 27 is provided in the kneading chamber 3
Is formed to have the same length as or slightly longer than the axial range (exhaust region 28) of the rotor in which the exhaust port 15 is formed.

As shown in FIG. 3A, the discharge portion 27 is composed of a short cylindrical discharge segment 29 spline-fitted to the outer peripheral portion of the shaft body 4A which constitutes the core of the rotor 4, and this discharge segment On the outer peripheral surface of 29, three discharge blades 3 which are radially outwardly protruded at intervals of 120 degrees in the circumferential direction.
0, 31, 32 are formed. These three exhaust wings 3
The protrusions 0, 31, and 32 are set to have the same amount of projection in the radial direction, but are formed to have different extension lengths in the rotor axial direction. The number of the exhaust blades 30, 31, 32 is formed in a shape that 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, 32 extend from the connection point with the second feed section 20 (upstream end 28A of the discharge region 28) in parallel with the rotor axial direction. Of these, the first exhaust blade 30 having the shortest extension length is formed to have a length of approximately one-third of the axial length of the exhaust region 28 in the rotor axial direction, and the extension length is next. The second exhaust vane 31 having a short length is formed to have a length of approximately two-thirds of the axial length of the exhaust region 28 in the rotor axial direction, and the third exhaust vane 32 having the longest length is approximately equal to the axial length of the exhaust region 28 in the rotor axial direction. Formed in length.

Therefore, the number of blades of the discharge portion 27 is 3 in the upstream portion of the discharge portion 27 in the rotor axial direction, 2 in the intermediate portion in the same direction, and 1 in the downstream portion in the same direction ((a in FIG. 3). ) ~
(See (c)), the number of blades gradually decreases toward the downstream side in the rotor axial direction. Note that, as shown in FIG. 3C, the phase angle θ in the circumferential direction of the discharging portion 27 is shifted by 60 degrees from side to side.

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

Thereafter, the melted kneaded material reaches the second feed section 20 of the second stage 3B while adjusting the degree of kneading (temperature) by the gate device 17, and the same feed section 20 is supplied.
Is pushed into 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 opening below the area 28. At this time, in the present embodiment, the number of blades of the discharge portion 27 is gradually reduced toward the downstream side in the axial direction of the rotor, so that the discharge blades 30, 31, 32 are mixed with the kneaded material as the rotor 4 rotates. The shearing work to be applied to is gradually decreased toward the downstream side in the axial direction of the rotor.

Therefore, the shear work amount added to the kneaded material flowing in the downstream portion of the discharge port 15 having a smaller discharge flow rate than the shear work amount added to the kneaded material flowing in the upstream portion of the discharge port 15 having a larger discharge flow rate. Becomes smaller, the shearing work per unit weight applied to the kneaded material flowing in the discharge port 15 becomes substantially equal in the axial direction of the rotor, and a large temperature difference between the upstream side and the downstream side of the discharge port 15 occurs. It will be prevented from occurring.

Thus, in this embodiment, the discharge port 15
Since the resin temperature inside the container can be made almost uniform, deterioration of the kneaded material due to unexpected temperature rise can be prevented, which in turn can improve the quality of the final product and prevent uneven pellet lengths. Become. In addition, outlet 1
Since the resin temperature in 5 can be made almost uniform, the gate device 1
There is also an effect that the kneading degree adjustment by 7 and the kneading degree adjustment by the suction pressure control of the gear pump 22 can be easily performed.

Further, in this embodiment, the three discharge blades 3 are provided.
Of the 0, 31, and 32, the third discharge blade 32 does not change its cross-sectional shape in the rotor axial direction and the discharge area 28
Since it is extended to a length substantially equal to the above, the third discharging blade 32 ensures a resin scraping function in the entire discharging region 28 in the axial direction of the rotor. Therefore, it is possible to prevent the discharge capacity of the resin from being lowered due to the shortening of the other first and second discharge blades 30 and 31, and a part of the resin is retained in the discharge area 28. It is possible to prevent continuous deterioration.

Further, as described above, according to the present invention, the problem of temperature nonuniformity at the discharge port of the both-end supporting type twin-screw continuous kneader 1 can be solved. Therefore, various connection structures with the gear pump 22 can be adopted. Therefore, FIGS. 5 to 7 show variations of the connection structure of the chamber 2 and the gear pump 22 that can be applied to the twin-screw continuous kneading machine 1 adopting the present invention.

Of these, in FIG. 5 (a), the horizontally arranged gear pump 22 is directly connected to the lower surface of the chamber 2 having the downward discharge port 15. In FIG. 5 (b), the downward discharge port 1 is shown.
An L-shaped pipe line 35 is connected to the lower surface of the chamber 2 having 5 and the vertically arranged gear pump 22 is directly connected to the pipe line 35. Further, in FIG. 6A, the discharge port 15 is also tilted due to the tilted relationship of the rotor 4, and a vertically arranged gear pump 22 is connected to the tilted discharge port 15.
In FIG. 6B, the discharge port 15 is opened in the horizontal direction in a relationship where the rotor 4 is oriented vertically, and the gear pump 22 arranged vertically is connected to the discharge port 15. In addition, FIG.
In (c), a horizontal discharge port 15 is formed in the chamber 2 having the horizontally arranged rotor 4, and a vertically arranged gear pump 22 is connected to the discharge port 15.

FIG. 7 shows a connection structure in which the left and right kneading chambers 3 in the second stage 3B are independent of each other. Of these, in FIG. 7A, the discharge port 15 communicating with each kneading chamber 3 is also inclined due to the inclined rotor 4, and the elbow pipe line 36 connected to this inclined discharge port 15 is oriented vertically. The arranged gear pump 22 is directly connected.
In addition, in FIG. 7B, the discharge port 1 communicating with each kneading chamber 3 is provided.
5 are opened on the left and right side surfaces of the chamber 2, and in each kneading chamber 3, a vertically arranged gear pump 22 is provided.
7 are connected to each other.

8 and 9 show a second embodiment of the present invention. This embodiment is similar to the first embodiment in that the discharge part 27 is provided with three discharge blades 30, 31, 32, but the shearing work given to the kneaded material toward the downstream side in the axial direction of the rotor. The blade shape for reducing the difference is different from that in the first embodiment.

That is, in the present embodiment, the protruding heights of the first and second discharge vanes 30 and 31 are tapered so that the protruding height becomes gradually smaller toward the downstream side (the right side in FIG. 8). The tip clearances of the discharge vanes 30 and 31 are gradually increased toward the downstream side in the axial direction of the rotor. Therefore, also in the present embodiment, when the kneaded material is discharged 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 axial direction of the rotor. The operation in this respect is similar to that of the first embodiment.

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

Therefore, 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. Further, in this embodiment, as the kneading degree adjusting means, not the gear pump 22, but a flapper orifice 40 including a lid member 38 pivotally attached to the discharge port 15 and a cylinder 39 for swinging the lid member 38.
Has been adopted.

However, the flapper orifice 40 may be adopted in the two-stage type twin-screw continuous kneader 1 of the first embodiment (FIG. 4), and the two-screw continuous kneader of the present embodiment (FIG. It is also possible to connect the gear pump 22 to 10). Since the other basic structure is almost the same as that of the first embodiment, the same reference numerals are given to the drawings and the detailed structure description will be omitted.

Although the respective embodiments of the present invention have been described above, these embodiments are merely illustrative and not restrictive. The technical scope of the present invention is determined by the appended claims, and all embodiments that come within the meaning thereof are included in the scope of the present invention. For example, in the example shown in FIG.
Although all 7 have a length equal to or longer than the axial length of the exhaust port 15 in the rotor axial direction, it may be slightly shorter than the axial length of the exhaust port 15 in the rotor axial direction.

Further, the number of blades of the discharge part 27 is not limited to 3 but is 1
It suffices to have one or more, and the present invention is applicable not only to parallel flights parallel to the axial direction of the rotor 4 but also to inclined flights slightly twisted in the resin feed direction or the resin return direction. can do. Further, in each of the above-described embodiments, the biaxial continuous kneading machine 1 in which the pair of rotors 4 all rotate in different directions is illustrated, but the present invention shows that the resin at the discharge port 15 opening radially outward of the rotor 4 is used. Since the temperature distribution is uniform, it can be adopted regardless of the rotation direction or the number of 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-rotor single-screw kneading extruder and a multi-screw kneading extruder having three or more rotors. .

[0045]

EXAMPLES Next, examples (experimental examples) for demonstrating the effects of the present invention will be described. This experiment was performed by actually test-kneading the material to be kneaded using the twin-screw continuous kneading machine 1 according to the first embodiment described above, and measuring the resin temperature at the discharge port 15 at that time. The common conditions for this 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: Measuring point of structural temperature in Fig. 11: Upstream point A of outlet in Fig. 11,
Central point B, downstream point C Material of material to be kneaded: HDPE (MI = 0.08) (Experimental example 1) Under the above common conditions, the production amount is 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 part 27 of the present invention shown in FIG.
All three blades were tested and kneaded with a conventional discharge part extending to the downstream end face of the chamber, and the discharge port 15
The resin temperature at each of the above points A to C was measured. The result is shown in FIG.

As can be seen from FIG. 12, when comparing the resin temperatures at the discharge ports in the case of the present invention (▲) and in the case of the conventional example (●), there is little difference between the resin temperatures at the upstream point A. However, in the case of the present invention, the resin temperature is lowered 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) Further, the same test kneading was carried out 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 clear from a comparison of FIGS. 13 and 12, when the production amount and the rotor rotational speed are increased, the temperature rise at the downstream point C of the discharge port becomes severe in the conventional example, but in the present invention, that is the case. The rapid temperature rise 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 made as small as possible while ensuring the resin scraping function in the discharge region, so that the discharge condition can be maintained at the discharge port without narrowing the operating conditions of the continuous kneader. It is possible to prevent deterioration of the kneaded material due to the unexpected temperature rise.

[Brief description of drawings]

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

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

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

FIG. 4 is a side sectional view showing the overall structure of the twin-screw continuous kneading machine 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 the connection structure between the chamber and the 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 the twin-screw continuous kneading machine according to the second embodiment.

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

FIG. 10 is a side sectional view showing the overall structure of a biaxial continuous kneading machine according to a third embodiment.

FIG. 11 is a cross-sectional view showing a connection structure of a biaxial continuous kneading machine and a gear pump adopted in a test kneading (experimental example).

FIG. 12 is a graph showing a resin temperature distribution in a discharge port.

FIG. 13 is a graph showing a resin temperature distribution in the discharge port.

FIG. 14 is a graph showing the cause of the temperature non-uniformity in the outlet,
It is a side surface sectional view of the downstream part of the conventional biaxial continuous kneading machine.

[Explanation of symbols]

1 Biaxial continuous kneader 2 chamber 4 rotor 13 Material supply port 15 outlet 18 First feed section 19 Kneading department 20 Second feed section 27 Discharge part 30 First discharge wing 31 Second discharge wing 32 Third discharge wing

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsunori Takahashi 2-3-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Kobe Steel Works, Takasago Works (72) Inventor Shigehiro Kasai 2-chome, Niihama, Arai-cho, Takasago, Hyogo Prefecture No. 3-1 Kobe Steel Co., Ltd. Takasago Works (72) Inventor Tatsuya Tanaka 2-3-1 Niihama, Arai-cho, Takasago-shi, Hyogo Kobe Steel Works Takasago Works (56) Reference: JP-A-63-28609 (JP, A) JP 59-158135 (JP, A) JP 56-101811 (JP, A) JP 56-21634 (JP, A) JP 51-22162 (JP, A) Kaihei 10-244531 (JP, A) JP 10-138235 (JP, A) JP 10-6330 (JP, A) JP 9-1630 (JP, A) JP 8-108429 ( JP, A) JP-A-8-20019 (J , A) JP-A-7-164433 (JP, A) JP-A-4-40224 (JP, A) JP-A-2-263609 (JP, A) Actually open Sho-57-81113 (JP, U) Actually open-flat 4-83712 (JP, U) Actual Kaihei 3-106010 (JP, U) Actual public Sho 63-23126 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) B29B 7/00 -17/02

Claims (4)

(57) [Claims] 1. A feed section (18, 2) for a material to be kneaded in a chamber (2) having a material supply port (13) at one end.
0) and a kneading part (19) on the outer peripheral surface are rotatably inserted while supporting both ends in the axial direction,
A discharge part (27) for scraping the kneaded material kneaded by the rotor (4) outward in the radial direction is formed at the other end of the rotor (4) and scraped by the discharge part (27). Continuous kneading in which a discharge port (15) for discharging the kneaded material that has been kneaded 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). In the machine, the discharge part (27) of the rotor (4) protrudes radially outward so that the shearing work given to the kneaded material by the rotation thereof decreases toward the other end side in the axial direction of the rotor. A plurality of discharge blades extending in the rotor axial direction are provided along the circumferential direction, and the lengths of the discharge blades (30, 31, 32) extending to the other end side in the rotor axial direction are made different, and the discharge blades ( 30-32), the number of blades increases toward the other end of the rotor axial direction. A continuous kneader characterized by being formed so as to gradually decrease. 2. A feed section (18, 2) for the material to be kneaded in a chamber (2) having a material supply port (13) at one end.
0) and a kneading part (19) on the outer peripheral surface are rotatably inserted while supporting both ends in the axial direction,
A discharge part (27) for scraping the kneaded material kneaded by the rotor (4) outward in the radial direction is formed at the other end of the rotor (4) and scraped by the discharge part (27). Continuous kneading in which a discharge port (15) for discharging the kneaded material that has been kneaded 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). In the machine, the discharge part (27) of the rotor (4) protrudes radially outward so that the shearing work given to the kneaded material by the rotation thereof decreases toward the other end side in the axial direction of the rotor. A discharge blade extending in the rotor axial direction is provided, and the projection amount of the discharge blade is reduced toward the other end side in the rotor axial direction, so that the tip clearance of this discharge blade is asymptotic toward the other end side in the rotor axial direction. Increase A continuous kneader characterized by being formed as follows. 3. A feed section (18, 2) for the material to be kneaded in a chamber (2) having a material supply port (13) at one end.
0) and a kneading part (19) on the outer peripheral surface are rotatably inserted while supporting both ends in the axial direction,
A discharge part (27) for scraping the kneaded material kneaded by the rotor (4) outward in the radial direction is formed at the other end of the rotor (4) and scraped by the discharge part (27). Continuous kneading in which a discharge port (15) for discharging the kneaded material that has been kneaded 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). In the machine, the discharge part (27) of the rotor (4) protrudes radially outward so that the shearing work given to the kneaded material by the rotation thereof decreases toward the other end side in the axial direction of the rotor. A plurality of discharge blades extending in the axial direction of the rotor are provided along the circumferential direction, and some of the plurality of discharge blades (3
0, 31) decreases the protrusion amount of the discharge vane toward the other end side in the rotor axial direction, so that the tip clearance of the discharge vane gradually increases toward the other end side in the rotor axial direction. 2. The continuous kneading machine characterized in that the remaining discharge blades (32) are formed so as to extend in the same direction so that their cross-sectional shape does not change in the rotor axial direction. 4. The feed section (18, 20) for the material to be kneaded
And a kneading part (19) and a kneaded material discharge part (27) on the outer peripheral surface, and the discharge part (27) is formed in the chamber (2) by opening in a direction intersecting the material conveying direction. In a rotor of a continuous kneading machine (1) which is inserted into the chamber (2) in a state where both axial ends thereof are rotatably supported so as to correspond to an outlet (15), the discharge part (27) is a Item 2. A rotor for a continuous kneading machine, which is formed into the shape according to any one of Items 1 to 3.