JP2014162042A - Rubber material manufacturing method in which rubber material and composition agent are kneaded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber material manufacturing method for kneading rubber material and a composition agent in which scrap generation can be suppressed, cooling efficiency is excellent, and kneading can be implemented by a cheap apparatus.SOLUTION: In the initial period of kneading, a first stock guide 30 is positioned at the edge of a supply part 20, a second stock guide 32 is positioned at a place near the first stock guide 30, and kneading is implemented between the stock guides 30, 32. As the quantity of input rubber material increases, the second stock guide 32 is moved gradually to an exhaust part 22 side, is stopped at the place of the exhaust part 22 and the rubber material which is kneaded sufficiently between the first stock guide 30 and the second stock guide 32 is taken out from the exhaust part 22. An the finishing time of kneading, the rubber material which is kneaded between the first stock guide 30 and the second stock guide 32 is taken out from the exhaust part 22, while the first stock guide 30 is being moved to the second stock guide 32.

Description

  The present invention relates to a rubber material manufacturing method in which a rubber material and a compounding agent are continuously kneaded using an open roll machine, and more specifically, a rubber material and a compounding agent are continuously supplied to an open roll machine. In addition, the present invention relates to a method for producing a rubber material, in which a rubber material and a compounding agent are kneaded so as to eliminate waste generated at the beginning of kneading and waste generated at the end of kneading when continuously taking out the kneaded rubber material.

Rubber products are generally formed by processing rubber materials containing various compounding agents.
In blending various compounding agents into the rubber material, first, mastication is performed, and properties that enable mixing of the compounding agent and properties necessary for vulcanization processing are imparted to the rubber material.
In the kneading, the kneaded rubber material is blended with a compounding agent such as a reinforcing material, an anti-aging material, a cross-linking material, or a cross-linking accelerator. It is preferable to be blended in
As an apparatus for continuously kneading a large amount of rubber, for example, a closed continuous kneader (Patent Document 1) in which a pair of kneading rotors rotating in opposite directions is arranged in a hollow barrel is known.

  In this closed continuous kneader, the material to be kneaded is continuously supplied into the barrel from the supply port at one end in the longitudinal direction of the barrel, and the material kneaded by the pair of kneading rotors is moved in the longitudinal direction of the barrel. It is made to take out continuously from the taking-out opening of the other end.

JP2011-152705A

However, in a closed continuous kneader, heat is difficult to escape, which is disadvantageous in improving cooling efficiency, and a large power source is required to rotate the pair of kneading rotors, and the apparatus is expensive and large. It becomes.
Further, in the closed continuous kneader, since the inside of the barrel is not stable at the initial stage when the material to be kneaded is first charged and at the end stage when the material to be kneaded is stopped, sufficient material is taken out from the take-out port. Since it is not kneaded and becomes waste and waste is produced, there is a disadvantage in reducing the cost.
Therefore, it is conceivable that kneading is continuously performed using a small and inexpensive open roll machine, in which heat easily escapes and has excellent cooling efficiency, does not require a large power source.
When using an open roll machine, the material to be kneaded is continuously added to one end in the longitudinal direction of the front roll and the rear roll, and the material kneaded from the other end in the longitudinal direction of the front roll and the rear roll It is possible to take out continuously.
However, even in the case of using an open roll machine, as in the case of the closed continuous kneader, the front roll and the rear roll are divided into an initial stage in which the material to be kneaded is initially charged and an end stage in which the material to be kneaded is stopped. Since the bank that rises in between is not stable, the material to be taken out is not sufficiently kneaded and becomes waste, which is disadvantageous in reducing the cost because waste is generated.
The present invention has been devised in view of the above circumstances, and an object of the present invention is to continuously knead a rubber material and a compounding agent using an open roll machine while suppressing generation of waste. The object is to provide a method for producing a rubber material.

  In order to achieve the above object, the present invention continuously feeds a rubber material together with a compounding agent into a supply portion located at one end in the longitudinal direction of the front roll and the rear roll of an open roll machine, and the two rolls. Are rotated in opposite directions, and the rubber material and the compounding agent are kneaded between the two rolls and moved toward the discharge portion located at the other end in the longitudinal direction of the two rolls. When the rubber material mixed with the compounding agent is continuously taken out from the discharge part, it extends in a direction orthogonal to the longitudinal direction and continuously extends over the upper part of the front roll and the upper part of the rear roll. The first stock guide and the second stock guide that can come into contact with the outer peripheral surface and the outer peripheral surface of the rear roll are arranged so as to be movable in the longitudinal direction. Stockga And the second stock guide closer to the first stock guide on the discharge portion side than the first stock guide. The rubber material that is placed and increased when the first stock guide and the second stock guide are kneaded and the amount of the rubber material to be charged reaches a predetermined amount. The second stock guide is gradually moved to the discharge portion side in accordance with the amount of kneading, kneading is performed between the first stock guide and the second stock guide, and the second stock guide is discharged from the discharge portion. When reaching the other end side in the longitudinal direction at the portion, the second stock guide is positioned at the portion, and kneading is performed between the first stock guide and the second stock guide. line At the same time, the kneaded rubber material is taken out from the discharge portion, and at the end of kneading to stop the introduction of the rubber material, the first stock guide is moved toward the second stock guide while the first stock guide is moved. The rubber material kneaded between the stock guide and the second stock guide is taken out from the discharge portion.

According to the present invention, the rubber material and the compounding agent are kneaded between the first stock guide and the second stock guide at the initial stage of kneading to start supplying the rubber material and the compounding agent to the supply unit. The rubber material is not taken out from the discharge part.
The second stock guide is gradually moved to the discharge portion side in accordance with the amount of the rubber material that is continuously charged and increased, and when the second stock guide reaches the location of the discharge portion, the second stock guide is moved to the discharge portion side. The kneaded rubber material is kneaded between the first stock guide and the second stock guide, and the kneaded rubber material is continuously taken out from the discharge portion.
At the end of kneading, the first stock guide is moved to the discharge section side, and all the kneaded rubber material and compounding agent remaining between the first stock guide and the second stock guide are discharged. Remove from the part.
Therefore, at the initial stage of kneading and at the end of kneading, the rubber material and the compounding agent are kneaded continuously using an open roll machine without generating scraps that are rubber materials in which the compounding agent is not uniformly compounded. be able to.
Further, since an open roll machine is used, kneading can be continuously performed with a small and inexpensive apparatus having excellent cooling efficiency.

The first stock guide is located at one end side in the longitudinal direction of the front roll and the rear roll at the supply section, and the initial opening of the kneading state in which the second stock guide is close to the first stock guide. It is explanatory drawing of a roll machine, (A) is a top view, (B) is a front view. It is explanatory drawing of the open roll machine of the state which left the 1st stock guide to the supply part side, and moved the 2nd stock guide to the discharge part side, (A) is a top view, (B) is a front view FIG. It is explanatory drawing of the open roll machine of the state which the 2nd stock guide reached the discharge part side, (A) is a top view, (B) is a front view. It is explanatory drawing of an open roll machine in the state where the 2nd stock guide was made still at the discharge part side, and the 1st stock guide was moved to the discharge part side, (A) is a top view, (B) is a front view It is. It is explanatory drawing of an open roll machine in the state where the 2nd stock guide was made still at the discharge part side, and the 1st stock guide was moved to the discharge part side, (A) is a top view, (B) is a front view It is. It is CC sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. (A) is a plan view, (B) is a front view, (C) is a sectional view taken along the line CC of (B), and (D) is an explanatory view of the first and second stock guides. It is DD sectional view taken on the line.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1-7, the open roll machine 10 is equipped with the front roll 12 and the rear roll 14 which are arrange | positioned in parallel mutually and which can adjust temperature and a rotational speed.
The temperature of the outer peripheral surface of the front roll 12 is set to be higher than the temperature of the outer peripheral surface of the rear roll 14 so that the rubber material easily adheres to the outer peripheral surface of the front roll 12. The speed is set larger than the peripheral speed of the outer peripheral surface of the rear roll 14.
The outer peripheral surface of the front roll 12 and the outer peripheral surface of the rear roll 14 are formed with a concavo-convex structure for moving the rubber material from one end portion in the longitudinal direction of the two rolls to the other end portion. Yes. As shown in FIG. 1, the present embodiment uses a concave groove 16 formed in a spiral shape on the outer peripheral surface of the front roll 12 and the outer peripheral surface of the rear roll 14 as an uneven structure.
The front roll 12 and the rear roll 14 are rotated in directions opposite to each other, and one end portion in the longitudinal direction of the front roll 12 and the rear roll 14 is supplied with a kneaded rubber material together with a compounding agent 20. The other end portion in the longitudinal direction is a discharge portion 22 for taking out the rubber material kneaded with the compounding agent.
As shown in FIGS. 3 and 7, a rubber scraping blade 24 that contacts the outer peripheral surface of the front roll 12 is disposed in the discharge unit 22.
In the figure, reference numeral 28A indicates a rubber material adhering to the outer peripheral surface of the front roll 12, and reference numeral 28B indicates a bank which is a kneaded rubber material that rises between the front roll 12 and the rear roll 14. Yes.

Further, a first stock guide 30 and a second stock guide 32 are disposed above the front roll 12 and the rear roll 14. The first stock guide 30 and the second stock guide 32 are movable in the longitudinal direction of the front roll 12 and the rear roll 14 via the guide means. The guide means in this case is, for example, configured by a plurality of guide rods slidably coupled to the first stock guide 30 and the second stock guide 32 and arranged in parallel with the front roll 12 and the rear roll 14. Various known structures can be employed.
The first stock guide 30 and the second stock guide 32 have the same shape as each other. As shown in FIG. 8, the main body plate portion 3002 and two arc portions 3004 provided at the lower portion of the main body plate portion 3002. have.
The first stock guide 30 and the second stock guide 32 extend in a direction perpendicular to the longitudinal direction of the front roll 12 and the rear roll 14 when viewed in plan.
The two arc portions 3004 are provided so as to be able to contact the outer peripheral surface of the front roll 12 and the outer peripheral surface of the rear roll 14 continuously over the upper portion of the front roll 12 and the upper portion of the rear roll 14. The inclined surface 3006 is formed so that the rubber material adhering to the outer peripheral surface of the front roll 12 and the outer peripheral surface of the rear roll 14 can be easily scraped.
The first stock guide 30 and the second stock guide 32 are moved along the longitudinal direction of the front roll 12 and the rear roll 14 by driving means (not shown). As the driving means in this case, various conventionally known configurations such as a hydraulic cylinder can be employed.

Further, the first stock guide 30 detects the height of the kneaded rubber material bank 28 </ b> B that rises between the front roll 12 and the rear roll 14 at a location where the first stock guide 30 faces the second stock guide 32. A sensor 34 is provided.
Further, the second stock guide 32 detects the height of the kneaded rubber material bank 28 </ b> B that rises between the front roll 12 and the rear roll 14 at a location facing the first stock guide 30. A sensor 36 is provided.
The sensors 34 and 36 are connected to the control means, and the speed of movement of the first stock guide 30 and the speed of movement of the second stock guide 32 are adjusted based on the detected height of the bank 28B. The

Next, the kneading operation will be described.
In the initial stage of kneading to start supplying the rubber material and the compounding agent to the supply unit 20, as shown in FIG. 1, the first stock guide 30 is moved in the longitudinal direction of the front roll 12 and the rear roll 14 at the supply unit 20. It is located on one end side.
Further, the second stock guide 32 is positioned at a location closer to the first stock guide 30 on the discharge portion 22 side than the first stock guide 30.
Then, the two rolls are rotated in opposite directions to start supplying the rubber material and the compounding agent between the first stock guide 30 and the second stock guide 32 between the two rolls. .

The supplied rubber material and compounding agent are kneaded between the two rolls 12 and 14 rotating in opposite directions, and the kneaded rubber material and compounding agent are banked between the two rolls 12 and 14. It rises as 28B.
Further, the kneaded rubber material and the compounding agent leaking from the gap between the two rolls 12 and 14 are wound around the outer peripheral surface of the front roll 12 as indicated by reference numeral 28A.
The bank 28 </ b> B and the rubber material 28 </ b> A wound around the front roll 12 are kneaded between the two rolls 12 and 14 and are moved to the discharge portion 22 side by the concave groove 16, but adhere to the front roll 12. The rubber material 28A is prevented from moving by the arc portion 3004 of the second stock guide 32, and the bank 28B is prevented from moving by the arc portion 3004 and the main body plate portion 3002 of the second stock guide 32. Needless to say, the first stock guide 30 prevents movement of the supplied rubber material and compounding agent toward the one end side in the longitudinal direction of the front roll 12 and the rear roll 14 from the supply unit 20.
That is, since the first stock guide 30 and the second stock guide 32 are kept stationary until the supplied rubber material reaches a certain amount, even if the amount of the supplied rubber material and the compounding agent is small, The kneading is sufficiently performed between the first stock guide 30 and the second stock guide 32, and the rubber material in which the compounding agent is not evenly blended is not taken out from the discharge portion 22.
Whether or not the supplied rubber material has reached a certain amount is determined from the height of the bank 28B detected by the sensors 34 and 36.

Eventually, when the amount of rubber material to be supplied reaches a certain amount, the first stock guide 30 is kept stationary as shown in FIG. 2, and as the amount of rubber material to be fed increases, The two stock guides 32 are gradually moved to the discharge unit 22 side, and kneading is sufficiently performed between the first stock guide 30 and the second stock guide 32. Also in this case, the rubber material in which the compounding agent is not evenly blended is not taken out from the discharge portion 22.
The moving speed of the second stock guide 32 is adjusted based on the height of the bank 28 </ b> B detected by the sensors 34 and 36. For example, when the height of the bank 28B detected by the first sensor 34 provided in the first stock guide 30 is lower than a predetermined height, the height of the bank 28B is set to the predetermined height. 2) The moving speed of the stock guide 32 is lowered and kneading is sufficiently performed. Further, when the height of the bank 28B detected by the second sensor 36 provided in the second stock guide 32 is higher than a predetermined height, the height of the bank 28B is set to the predetermined height. The moving speed of the second stock guide 32 is increased so that necessary and sufficient kneading is performed.

The second stock guide 32 is moved as the amount of the rubber material charged in this way increases, and the second stock guide 32 is moved to the front roll 12 at the discharge portion 22 as shown in FIG. When the other end in the longitudinal direction of the rear roll 14 is reached, the second stock guide 32 is stopped at that position.
When the second stock guide 32 is located at the end of the discharge portion 22, the rubber material sufficiently kneaded between the first stock guide 30 and the second stock guide 32 is as shown in FIG. Then, it is scraped off by the blades 24 and becomes a belt-like rubber material 28C and is sent to the next step.
Thereafter, the rubber material and the compounding agent are supplied to the supply unit 20, kneaded by two rolls, and discharged from the discharge unit 22.

When the kneading is finished, the charging of the rubber material and the compounding agent into the supply unit 20 is stopped.
When the charging of the rubber material and the compounding agent is stopped, the rubber material moves from the supply unit 20 toward the discharge unit 22, so that the height of the bank 28B decreases.
Next, as shown in FIGS. 4 and 5, the second stock guide 32 is kept stationary, and the first stock guide 30 is moved to the discharge portion 22 side.
Also in this case, the height of the bank 28B is detected by the sensors 34 and 36 provided in the first stock guide 30 and the second stock guide 32 so that the kneading is sufficiently performed, and the moving speed is adjusted. While kneading.

By the movement of the first stock guide 30, the rubber material 28A and the bank 28B attached to the front roll 12 are moved to the discharge unit 22 side. That is, at the end of kneading, the rubber material and the compounding agent supplied to the open roll machine 10 are moved to the discharge unit 22 side while being kneaded.
When the first stock guide 30 reaches the location of the discharge portion 22 in the vicinity of the second stock guide 32, the movement of the first stock guide 30 is stopped.
As a result, the kneaded rubber material and the compounding agent remaining between the first stock guide 30 and the second stock guide 32 are all scraped off by the blades 24 and sent to the next step.
Therefore, at the end of kneading, there is no generation of scraps in which the compounding agent is not blended uniformly.
When the kneading is finished, the first stock guide 30 and the second stock guide 32 are returned to the original positions on the supply unit 20 to prepare for the next kneading.

According to the present embodiment, rubber can be kneaded continuously without producing waste at the initial stage of kneading and at the end of kneading, which is advantageous in reducing costs.
In addition, since the open roll machine 10 is used, heat is easily released compared with the case of kneading with a conventional closed continuous kneader, which is advantageous in improving the cooling efficiency, and driving the open roll machine 10. Therefore, it is possible to continuously knead with a small and inexpensive apparatus without requiring a large power source.

  DESCRIPTION OF SYMBOLS 10 ... Open roll machine, 12 ... Front roll, 14 ... Rear roll, 16 ... Concave groove, 20 ... Supply part, 22 ... Discharge part, 28A ... Rubber material adhering to the outer peripheral surface of a front roll , 28B ... bank, 30 ... first stock guide, 32 ... second stock guide, 34 ... first sensor, 36 ... second sensor.

Claims (2)

A rubber material is continuously added together with a compounding agent to a supply portion located at one end in the longitudinal direction of the front roll and the rear roll of an open roll machine,
The two rolls are rotated in opposite directions, and the rubber material and the compounding agent are kneaded between the two rolls, and the discharge part located at the other end in the longitudinal direction of the two rolls. Move towards
When continuously taking out the rubber material containing the compounding agent from the discharge part,
A first stock guide and a second stock guide which extend in a direction perpendicular to the longitudinal direction and can continuously contact the outer peripheral surface of the front roll and the outer peripheral surface of the rear roll continuously over the upper portion of the front roll and the upper portion of the rear roll. The stock guide is arranged to be movable in the longitudinal direction,
At the initial stage of kneading to start charging the rubber material, the first stock guide is positioned at one end side in the longitudinal direction at the supply portion, and the second stock guide is moved to the first stock guide. Positioned at a location closer to the first stock guide on the discharge part side than the stock guide, kneading between the first stock guide and the second stock guide,
When the amount of the rubber material to be charged reaches a predetermined amount, the second stock guide is gradually moved toward the discharge portion in accordance with the amount of the rubber material to be charged and increased, and the first stock guide and Kneading with the second stock guide,
When the second stock guide reaches the other end in the longitudinal direction at the location of the discharge portion, the second stock guide is positioned at the location, and the first stock guide and the second stock guide Kneading with the stock guide and taking out the kneaded rubber material from the discharge part,
At the end of kneading to stop the charging of the rubber material, the first stock guide is moved toward the second stock guide while being kneaded between the first stock guide and the second stock guide. The rubber material was taken out from the discharge part,
A rubber material production method comprising kneading a rubber material and a compounding agent. Detecting the height of the bank of kneaded rubber material that rises between the front roll and the rear roll;
Adjusting the speed of movement of the first stock guide and the speed of movement of the second stock guide based on the detected height of the bank;
A method for producing a rubber material, wherein the rubber material and the compounding agent according to claim 1 are kneaded.

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