JP6115181B2 - Rubber material manufacturing method for kneading rubber material and compounding agent and open roll machine - Google Patents

Description

  The present invention relates to a rubber material manufacturing method for continuously supplying a rubber material and a compounding agent to an open roll machine and continuously taking out the kneaded rubber material, and an open roll machine for carrying out this manufacturing method. More specifically, even in the case of a rubber material having low tack characteristics, a rubber material manufacturing method capable of continuously taking out a rubber material in which a compounding agent is uniformly mixed by an open roll machine, and this manufacturing method Relates to an open roll machine.

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, and in the kneading, the compounding agent is uniform with respect to the rubber material. 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.
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, when the tack property of the rubber material to be introduced is low, the rubber material leaking from the gap between the front roll and the rear roll is difficult to be wound around the front roll even if the temperature and rotation speed of the front roll are adjusted. Bulges away from the outer peripheral surface of the rubber, the amount returning to the bank that rises between the front roll and the rear roll is non-uniform, the rubber bend state is also non-uniform, and the rubber material in which the compounding agent is uniformly mixed is continuous. It is disadvantageous to take out.

  The present invention has been devised in view of the above circumstances, and the object of the present invention is to provide a rubber material in which a compounding agent is uniformly mixed by an open roll machine even in the case of a rubber material having low tack characteristics. An object of the present invention is to provide a method for producing a rubber material that can be continuously taken out, and an open roll machine that implements this production method.

In order to achieve the above object, a method for producing a rubber material in which a rubber material and a compounding agent of the present invention are kneaded is provided in a supply section located at one end in the longitudinal direction of a front roll and a rear roll of an open roll machine. The kneaded rubber material is continuously added together with the compounding agent, the front roll and the rear roll are rotated in opposite directions and kneaded between the rolls, and the kneaded rubber material and the compounding agent are rolled into the roll. The rubber material leaked from the gap between the rolls is wound around the outer peripheral surface of the front roll, and the wound rubber material is returned to the bank, and thus between the front roll and the rear roll. While kneading the rubber material and the compounding agent, the rubber material mixed with the compounding agent is continuously transferred from the supply unit toward the discharge unit located at the other end in the longitudinal direction. Upon taking out, distribution and location to face the switching Re eye forming member on the front roll, the cut forming member includes a body portion extending in parallel so as to face the front roll in the axial direction of the front roll, A plurality of blade portions extending in the axial direction of the main body portion and spaced apart in the circumferential direction of the main body portion, each having a V shape, and the main body portion is rotated in the rotation direction of the front roll The rubber material positioned on the outer peripheral surface of the front roll is pressed against the outer peripheral surface of the front roll by the plurality of blade portions, and the cut extending in the axial direction of the front roll is performed. A plurality of the rolls are formed at intervals in the circumferential direction of the front roll, and the rubber material is folded and mixed into the bank for each cut as the front roll rotates .
In addition, the present invention continuously introduces a rubber material masticated into a supply part located at one end in the longitudinal direction of a front roll and a rear roll that rotate in opposite directions together with a compounding agent, and a rubber material between the rolls. And kneading the rubber material and the compounding agent as a bank between the rolls, and winding the rubber material leaking from the gap between the rolls around the outer peripheral surface of the front roll, An open roll machine that moves a rubber material and a compounding agent while kneading them from the supply unit toward a discharge unit at the other end in the longitudinal direction of the two rolls, and is disposed to face the front roll. A main body portion extending in parallel to the axial direction of the front roll, and a plurality of cross sections extending in the axial direction of the main body portion and spaced apart in the circumferential direction of the main body portion are V-shaped. cut created having a blade portion And wood, the main body portion and the rotary drive means for cut created member to rotate is provided, said plurality of blade section, rotational direction opposite to the direction of the roll before the main body portion is said by the cut forming member for the rotary drive means by being rotated in, the mixed rubber material located on the outer peripheral surface of the front roll Rutotomoni pressed against the outer peripheral surface of the front roll, in and extending in the axial direction of the front roll to the rubber material the bank a cut that the rubber material is folded in that, characterized in that you multiply formed at intervals in the circumferential direction of the front roll.

According to the present invention, the rubber material located on the outer peripheral surface of the front roll is pressed against the outer peripheral surface of the front roll by the plurality of blade portions of the cut forming member, and extends to the rubber material in the axial direction of the front roll. A plurality of cuts are formed at intervals in the circumferential direction of the front roll.
With the rotation of the front roll, the rubber material is folded at the boundary at every break and mixed into the bank, which is advantageous for kneading in the bank more effectively.
Therefore, even if the rubber material has low tack characteristics, the rubber material leaking from the gap between the front roll and the rear roll is difficult to wrap around the outer peripheral surface of the front roll, and the bulge is separated from the outer peripheral surface of the front roll. The portion of the swelled rubber material is pressed against the outer peripheral surface of the front roll by the portion, and a cut is made. As a result, the air inside the swollen rubber material portion is released by the cut, and the swollen rubber material portion is wound around the outer peripheral surface of the front roll.
Then, with the rotation of the front roll, it is folded at the boundary at every gap and mixed into the bank, which is advantageous for kneading in the bank more effectively.

It is a side view at the time of kneading | mixing of an open roll machine provided with the cut formation member and the rotation drive means for cut formation members. It is a top view of the open roll machine by which the cut formation member is arrange | positioned. It is a top view at the time of kneading | mixing of an open roll machine provided with a cut formation member. It is a perspective view of a cut formation member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, an open roll machine 10 includes a front roll 12 and a rear roll 14 that are arranged in parallel to each other and adjustable in temperature and rotational speed, and roll rotation that drives the rolls 12 and 14 to rotate. Drive means (not shown) are provided.
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. In this embodiment, a concave and convex portion 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 is used as the concave-convex structure.
The front roll 12 and the rear roll 14 are rotated in directions opposite to each other by the roll rotation driving means, and one end portion in the longitudinal direction of the front roll 12 and the rear roll 14 is made of masticated rubber material together with a compounding agent. The supply portion 20 is supplied, and the other end portion in the longitudinal direction is a discharge portion 22 for taking out the rubber material kneaded with the compounding agent.

The rubber material and the compounding agent supplied to the supply unit 20 are kneaded between the two rolls 12 and 14 that rotate in opposite directions, and the kneaded rubber material and the compounding agent are two rolls 12 and 14. It rises as a bank 24 between 14.
Also, the kneaded rubber material and the compounding agent leaking from the gap between the two rolls 12 and 14 forming the bottom of the bank 24 are wound around the outer peripheral surface of the front roll 12 and returned to the bank 24 again. After being kneaded, the bank 24 moves from the supply unit 20 to the discharge unit 22 side. A rubber material wound around the outer peripheral surface of the front roll 12 is denoted by reference numeral 24A.

On the other hand, when the tack property of the rubber material is low, the rubber material containing the compounding agent is less likely to wrap around the outer peripheral surface of the front roll 12 and tends to bulge away from the outer peripheral surface of the front roll 12. The amount returned to the bank 24 that rises between the two becomes uneven, which is disadvantageous in effectively mixing the rubber material and the compounding agent in the bank 24.
Therefore, in the present invention, the rubber material 24A located on the outer peripheral surface of the front roll 12 is pressed against the outer peripheral surface of the front roll 12 to form a plurality of cuts 30 so that the mixing in the bank 24 is effectively performed. ing.

If it demonstrates in detail, the open roll machine 10 of this Embodiment is further provided with the cut | disconnection formation member 32 and the rotation drive means 34 for cut | interruption formation members.
The cut forming member 32 is disposed to face the front roll 12, and the axial direction of the cut forming member 32 is parallel to the axial direction of the front roll 12.
The cut forming member 32 may have a length over the entire length of the front roll 12, may have a length over a part of the front roll 12, and forms a cut along the axial direction of the front roll 12. The arrangement location of the member 32 is not limited and is arbitrary.
As shown in FIG. 4, the cut forming member 32 includes a cylindrical main body 3202 and a plurality of blade parts 3204 formed on the outer periphery of the main body 3202.
A rotation shaft 3206 (see FIG. 1) is coupled to the center hole of the main body 3202 so as to rotate integrally with the main body 3202 by a key.

The tip of the blade 3204 is formed with a size that is close to (including abutting against) the outer peripheral surface of the front roll 12.
A plurality of blade portions 3204 extend in the axial direction of the main body portion 3202 and are provided at intervals in the circumferential direction of the main body portion 3202.
Therefore, when the cut forming member 32 is rotated in the direction opposite to the rotation direction of the front roll 12, the plurality of blade portions 3204 press the rubber material 24 </ b> A located on the outer peripheral surface of the front roll 12 against the outer peripheral surface of the front roll 12. A plurality of cuts 30 extending in the axial direction of the front roll 12 are formed at intervals in the circumferential direction of the front roll 12.
In the present embodiment, the extending direction of the blade portion 3204 is inclined with respect to the axial direction of the main body portion 3202, and the cut 30 formed in the rubber material 24A located on the outer peripheral surface of the front roll 12 is: It extends in a direction inclined with respect to the axial direction of the front roll 12.
The cut forming member 32 may be configured by using, for example, a single helical gear or by arranging a plurality of helical gears having the same shape in the axial direction.
If the axial direction of the cut forming member 32 is parallel to the axial direction of the front roll 12 and the extending direction of the blade portion 3204 is inclined with respect to the axial direction of the main body 3202 as in the present embodiment, the front This is advantageous for smoothly and surely forming the cut 30 extending in a direction inclined with respect to the axial direction of the roll 12 with a simple configuration.

The cut forming member rotation driving means 34 rotates the cut forming member 32 in the direction opposite to the rotation direction of the front roll 12 so that the peripheral speed of the tip of the blade portion 3204 substantially matches the peripheral speed of the front roll 12. Is.
The cut forming member rotation drive means 34 includes a motor 3402 and a power transmission mechanism 3404 that transmits the power of the motor 3402 to the rotation shaft 3206.
The motor 3402 includes, for example, a reduction gear, and the number of rotations can be adjusted via a motor driver.
For the power transmission mechanism 3404, various conventionally known configurations such as a belt pulley mechanism that connects the rotating shaft 3206 and the output shaft of the motor 3402, or a sprocket chain mechanism can be employed.

Next, the operation and effect of the present embodiment will be described.
The rubber material and the compounding agent are charged into the supply unit 20, the two rolls 12 and 14 are rotated in the reverse direction, and the cut forming member 32 is rotated in the reverse direction to the front roll 12 in synchronization with the rotation of the front roll 12. .
The charged 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 24.
Further, the rubber material 24A containing the kneaded compounding agent leaking from the gap between the two rolls 12 and 14 forming the bottom of the bank 24 is wound around the outer peripheral surface of the front roll 12 and returned to the bank 24 again. Then, the bank 24 moves from the supply unit 20 to the discharge unit 22 side.

Then, by the rotation of the cut forming member 32, a plurality of cuts 30 are formed from the blade portion 3204 at intervals in the circumferential direction of the front roll 12 on the rubber material 24 </ b> A wound around the outer peripheral surface of the front roll 12.
Therefore, the rubber material 24A wound around the outer circumferential surface of the front roll 12 is folded into the bank 24 for each cut 30 and mixed into the bank 24, which is advantageous for more effective mixing in the bank 24. This is advantageous in continuously obtaining a rubber material in which the compounding agent is uniformly kneaded in the discharge portion 22.
In the present embodiment, the cuts 30 extending in the direction inclined with respect to the axial direction of the front roll 12 are spaced apart in the circumferential direction of the front roll 12 on the rubber material 24A wound around the outer peripheral surface of the front roll 12. A plurality of them are formed.
Therefore, the rubber material 24A wound around the outer peripheral surface of the front roll 12 is sequentially folded along the extending direction of the cut 30 for each cut 30 and mixed into the bank 24, and the mixing in the bank 24 is further performed. This is even more advantageous for effective execution.

Accordingly, when the rubber material 24A leaks from the gap between the two rolls 12 and 14 and the rubber material 24A hardly wraps around the front roll 12 and has a bulge away from the outer peripheral surface of the front roll 12, the tack property of the rubber material is low. In addition, the bulging portion of the rubber material 24A is pressed against the outer peripheral surface of the front roll 12 by the blade portion 3204 of the cut forming member 32, and the cut 30 is made.
That is, the expanded rubber material 24 </ b> A has its internal air released by the cut and is wound around the outer peripheral surface of the front roll 12.
As the front roll 12 rotates, the cuts 30 are sequentially folded along the extending direction of the cuts 30 and mixed into the banks 24, so that the mixing in the banks 24 can be performed more effectively. Even more advantageous.

  In the present embodiment, since the extending direction of the blade portion 3204 is inclined with respect to the axial direction of the cut forming member 32, the blade portion 3204 is separated from the rubber material 24A after the cut 30 is formed. The blade portion 3204 is easily peeled off from the rubber material 24A. That is, adhesion of the rubber material 24 </ b> A to the blade portion 3204 can be suppressed, which is advantageous in continuously forming the cuts 30 in the rubber material 24 </ b> A located on the outer peripheral surface of the front roll 12.

  10: Open roll machine, 12: Front roll, 14: Rear roll, 16 ... Recess, 20 ... Supply section, 22 ... Discharge section, 24 ... Bank, 24A ... On the outer peripheral surface of the front roll Wound rubber material, 30 ... cut, 32 ... cut forming member, 3204 ... blade portion, 34 ... rotation drive means for cut forming member, 3402 ... motor, 3404 ... power transmission mechanism.

Claims (4)

The rubber material kneaded into the supply part located between one end in the longitudinal direction of the front roll and the rear roll of the open roll machine is continuously added together with the compounding agent,
The front roll and the rear roll are rotated in opposite directions and kneaded between the rolls, and the kneaded rubber material and the compounding agent are raised as a bank between the rolls,
The rubber material leaking from the gap between the rolls is wound around the outer peripheral surface of the front roll, and the wound rubber material is returned to the bank,
In this way, while kneading the rubber material and the compounding agent between the front roll and the rear roll, it is moved from the supply section toward the discharge section located between the other ends in the longitudinal direction,
When continuously taking out the rubber material containing the compounding agent from the discharge part,
A switching Re eye member is opposed to the front roll was placed in,
The cut forming member includes a main body portion facing the front roll and extending in parallel with the axial direction of the front roll, and an axial direction of the main body portion and spaced in the circumferential direction of the main body portion. And a plurality of blade portions having a V-shaped cross section provided,
The main body portion is rotated in the direction opposite to the rotation direction of the front roll, and the plurality of blade portions press the rubber material located on the outer peripheral surface of the front roll against the outer peripheral surface of the front roll, and the front roll A plurality of cuts extending in the axial direction of the front roll are formed at intervals in the circumferential direction ,
With the rotation of the front roll, the rubber material is folded for each cut and mixed into the bank.
A rubber material production method comprising kneading a rubber material and a compounding agent. The cut formed in the rubber material wound around the front roll is inclined with respect to the axial direction of the main body part ,
A method for producing a rubber material, wherein the rubber material and the compounding agent according to claim 1 are kneaded. A rubber material masticated into a supply part located at one end in the longitudinal direction of the front roll and the rear roll rotating in opposite directions is continuously added together with a compounding agent,
The rubber material and the compounding agent are kneaded between the rolls, and the kneaded rubber material and the compounding agent are raised as a bank between the rolls, and the rubber material leaking from the gap between the rolls is added to the front roll. Wrap around the outer peripheral surface of
An open roll machine that moves while kneading the rubber material and the compounding agent from the supply unit toward the discharge unit at the other end in the longitudinal direction of the two rolls,
A main body portion disposed opposite to the front roll and extending parallel to the axial direction of the front roll, and an axial direction of the main body portion extending in the circumferential direction of the main body portion. A cut forming member having a plurality of blade portions having a V-shaped cross section ;
Rotation driving means for a cut forming member for rotating the main body , and
The plurality of blade portions are formed by rotating the main body portion in a direction opposite to the rotation direction of the front roll by the cut forming member rotation driving means, so that the rubber material positioned on the outer peripheral surface of the front roll is Rutotomoni pressed against the outer peripheral surface of the front roll, the cut which the rubber material is folded when it is mixed in and extending in the axial direction of the front roll to the rubber material the bank, intervals in the circumferential direction of the front roll Oite multiple formation,
An open roll machine characterized by that. The blade portion extends inclined with respect to the axial direction of the main body portion ,
The open roll machine according to claim 3.

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