JP2017065209A - Rubber extrusion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber extrusion device that, while having a simple structure, suppresses a rubber extrusion product from shrinking in the extrusion direction, shortens a time necessary until becoming a non-shrinking state, and does not generate adverse effect on use of the rubber extrusion product in the post-process.SOLUTION: A straightening body 8 having an apex 8a at a position projected forward from a front end surface of an extrusion port 6 is extended up to the inside of an extrusion channel 7 of at least a die 5 toward a cylinder 2 side, a rubber R1 is passed through a gap between an inner surface of the extrusion channel 7 and the straightening body 8 and a rubber extrusion product R is extruded from the extrusion port 6, a part that contacted with an inner surface of the extrusion channel 7 and a surface of the straightening body 8 shows an extending behavior in the extrusion direction after the extrusion and thereby suppresses a part of the rubber extrusion product R that is going to shrink from shrinking, and peripheral surfaces 10a of a pair of rollers 10 to serve as an extrusion mechanism are brought into contact with opposite surfaces of the rubber extrusion product R to press the rubber extrusion product R.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rubber extrusion device, and more specifically, while suppressing the shrinkage in the extruding direction of the rubber extrudate in a simple configuration, and reducing the time required until the rubber extrudate does not shrink, The present invention relates to a rubber extrusion device that does not adversely affect the use of a rubber extrudate.

  When manufacturing rubber products such as tires, there is an extrusion process in which unvulcanized rubber is extruded by a rubber extrusion device. In the rubber extrusion device, the unvulcanized rubber is plasticized by an internal screw, and is extruded from an extrusion port formed in the die at the tip to form a rubber extrudate molded into a predetermined shape. This rubber extrudate is cut to a predetermined length after cooling. Since rubber has viscoelastic properties, the strain in the extrusion process is stored in the interior as energy, and after cutting due to this, it shrinks (shrinks) mainly in the extrusion direction. If the shrinkage is excessive, a difference from a preset dimension becomes large, and there is a problem that troubles occur in a subsequent process.

  Various methods for solving such problems have been proposed in the past (see, for example, Patent Document 1). In Patent Document 1, the rubber extrudate is vibrated by a vibration device arranged on the downstream side of the extruder to increase the shrinkage speed of the rubber. In this way, the rubber extrudate is sufficiently shrunk to prevent shrinkage in the subsequent process.

  As another countermeasure, a method is known in which a plurality of transport conveyors are arranged in series on the downstream side of the extruder, and the downstream transport conveyor and the transport speed are set slower. In this method, the rubber extrudate is forcibly contracted when the transfer conveyor is transferred to prevent contraction in the subsequent process. However, these conventional measures have a problem that the apparatus becomes large.

JP-A-8-244090

  The object of the present invention is to suppress the shrinkage of the rubber extrudate in the extrusion direction while reducing the time required for the rubber extrudate to become non-shrinkable, and to adversely affect the use of the rubber extrudate in a subsequent process. It is an object of the present invention to provide a rubber extrusion device that does not cause the occurrence of the problem.

  In order to achieve the above object, a rubber extrusion device according to the present invention comprises a cylindrical cylinder, a screw disposed in the cylinder, a head installed at the tip of the cylinder, and a pusher disposed at the tip of the head. In a rubber extrusion apparatus including a die having an outlet, a tip is provided at a position protruding forward from a front end surface of the extrusion port, and extends from the tip toward the cylinder side to at least the inside of an extrusion flow path of the die. A position that sandwiches the rubber extrudate from the extrusion port, the current straightening body, and a pressing mechanism disposed in front of and near the front end of the straightening body. The rubber extrudate is passed through the extrusion port through the rubber extruded by the screw between the inner surface of the extrusion flow path and the rectifier. Extrusion, wherein while the contact portion comes into contact with the opposing surfaces of the rubber extrudate, characterized in that by moving in the extrusion direction of the rubber extrudate to a configuration in which a state of pressing the rubber extrudate.

  According to the present invention, by passing the rubber extruded by the screw between the inner surface of the extrusion channel and the rectifier, the rubber comes into contact with the inner surface of the extrusion channel and the surface of the rectifier. While being pushed out from the extrusion port. The strain in the direction orthogonal to the extrusion direction remains in the portion in contact with the inner surface of the rubber extrusion channel and the surface of the rectifier. When these portions are extruded from the extrusion port, they exhibit a behavior of extending in the extrusion direction due to this strain, and as a result, shrinkage of the rubber extrudate can be suppressed. Moreover, since the rectifying body protrudes from the front end face of the extrusion port, the rubber of the rubber extrudate can be left with the maximum distortion in the direction perpendicular to the extrusion direction. The effect of suppressing the shrinkage of is increased. That is, the shrinkage of the rubber extrudate in the extruding direction can be suppressed immediately after extrusion, while having a simple configuration provided with a rectifier without requiring a large structure. This makes it possible to shorten the time required for the rubber extrudate to be in a state where it does not shrink.

  On the other hand, by projecting the rectifying body from the front end face of the extrusion port, the risk that the rubber extrudate is divided by the rectifying body is increased. Therefore, in the present invention, even if the rubber extrudate is in a divided state, the contact portion constituting the pressing mechanism is in contact with the opposing surface of the rubber extrudate to press the rubber extrudate, It is possible to prevent the rubber extrudate from remaining divided. As a result, it is possible to avoid adverse effects such that the rubber extrudate is in a divided state and cannot be used as it is. And since a contact part moves to the extrusion direction of a rubber extrudate, contacting a rubber extrudate, it does not reduce the shrinkage | contraction suppression effect of the rubber extrudate by a rectifier.

  Here, for example, the extension length from the front end surface of the extrusion port of the rectifier to the cylinder side is set to 10 mm or more. According to this specification, distortion in a direction orthogonal to the extrusion direction can be sufficiently applied to the rubber portion that contacts the surface of the rectifying body. Therefore, it is advantageous for suppressing shrinkage in the extrusion direction of the rubber extrudate.

  For example, the rectifier is plate-shaped. By making it a plate-like rectifier, it is possible to prevent excessive resistance to rubber passing therethrough, so that rubber can be easily extruded smoothly.

  As the pressing mechanism, for example, a pair of rollers that are arranged with their peripheral surfaces facing each other at a position between which the rubber extrudate is sandwiched are used to make the contact portion a peripheral surface of the pair of rollers. Alternatively, a pair of belt conveyors arranged with the conveying surface facing each other as the pressing mechanism sandwiching the rubber extrudate can be used as the conveying surface of the pair of belt conveyors.

  A cooling means for cooling the contact portion may be provided, and the rubber extrudate may be cooled by the contact portion cooled by the cooling means. According to this configuration, since the rubber extrudate can be cooled immediately after extrusion, it is possible to shorten the cooling time of the rubber extrudate in a subsequent process.

It is explanatory drawing which illustrates the rubber extrusion apparatus of this invention by planar view. It is explanatory drawing which illustrates die | dye of FIG. 1 by front view. It is explanatory drawing which illustrates the head periphery of FIG. 1 by side surface sectional view. It is explanatory drawing which illustrates the state of the rubber extrudate immediately after extruded by the rubber extrusion apparatus of this invention by side sectional view. It is explanatory drawing which illustrates the state which presses a rubber extrudate by a press mechanism by side surface sectional view. It is explanatory drawing which illustrates another embodiment of the rubber extrusion apparatus of this invention by planar view. It is explanatory drawing which illustrates the head periphery of FIG. 6 by side surface sectional view. It is explanatory drawing which illustrates the state of the rubber extrudate immediately after extruded with the conventional rubber extrusion apparatus by side sectional view.

  Hereinafter, a rubber extrusion device of the present invention is explained based on an embodiment shown in a figure.

  A rubber extrusion device 1 of the present invention illustrated in FIGS. 1 to 3 includes a cylindrical cylinder 2, a screw 4 disposed inside the cylinder 2, and a head 3 installed at the tip of the cylinder 2. Yes. A die 5 is attached to the tip of the head 3. An extrusion port 6 is formed in the die 5. The rubber extrusion device 1 further includes a rectifying body 8 and two rollers 10 functioning as a pressing mechanism. In FIG. 1 and FIG. 3, the rubber extrudate R is indicated by a virtual line (two-dot chain line).

  The front end 8a of the rectifying body 8 is at a position protruding forward from the front end surface of the extrusion port 6, and the rear end 8b of the rectifying body 8 is at least a position inside the extrusion flow path 7 of the die 5 toward the cylinder 2 side. . That is, the rectifying body 8 extends from the position protruding forward from the front end face of the extrusion port 6 to the inside of the extrusion flow path 7 of the die 5 toward the cylinder 2 side.

  Although the rectifying body 8 of this embodiment has a flat plate shape, various shapes such as a cone shape and a pyramid shape can be adopted as the cylindrical shape in addition to the plate shape. The protrusion length a from the front end face of the extrusion port 6 of the rectifying body 8 to the front is, for example, 10 mm or more, and the upper limit value of the protrusion length a is, for example, about 100 mm. You can also.

  The extending length b from the front end face of the extrusion port 6 of the rectifier 8 toward the cylinder 2 is preferably 10 mm or more. The rectifying body 8 is fixed to the die 5 via a connecting portion 9 extending downward from the rectifying body 8, and extends across the extrusion flow path 7 formed in the die 5 and the head 3. The rectifying body 8 can be extended only to the extrusion flow path 7 formed in the die 5, but may be installed inside the extrusion flow path 7 formed in the die 5 and the head 3. The upper limit of the extension length b is, for example, about 100 mm, but is not limited to this, and can be about 200 mm.

  In this embodiment, a single flat plate-like rectifying body 8 is arranged with the plate thickness direction facing the thickness direction of the extrusion port 6, and is arranged at the center in the width direction of the extrusion port 6. The gaps w and w in the width direction between the extrusion channel 7 and the rectifier 8 are 10 mm or more. The left and right clearances w and w can be different, but they should be the same. The gaps t1 and t2 in the thickness direction between the extrusion channel 7 and the rectifier 8 are each 0.5 mm or more. The upper and lower gaps t1 and t2 can be different, but are preferably the same.

  The two rollers 10 disposed above and below are disposed in front of the tip 8 a of the rectifying body 8 and in the vicinity of the tip of the rectifying body 8. The peripheral surfaces 10 a of the rollers 10 are arranged so as to face the positions sandwiching the rubber extrudate R extruded from the extrusion port 6. The peripheral surface 10a of each roller 10 serves as a contact portion that contacts the opposing surface of the rubber extrudate R. Each roller 10 can be configured to smoothly rotate freely, or can be configured to be rotationally driven at a peripheral surface speed equivalent to the extrusion speed of the rubber extrudate R.

  In this embodiment, the roller 10 disposed on the lower side is fixed at a fixed position. The roller 10 disposed on the upper side is held by a gap adjusting mechanism 12 so as to be movable up and down. By moving the upper roller 10 up and down, the gap g (shortest distance) between the circumferential surfaces 10a of the rollers 10 facing each other can be changed. Other structures may be used as long as the gap g between the peripheral surfaces 10a can be changed. For example, the gap g is set to the same size as the dimension of the extrusion port 6 in the thickness direction.

  The support shaft of the roller 10 is a cooling means 13 through which cooling water flows. The peripheral surface 10a is cooled by the cooling means 13. The temperature of the cooled peripheral surface 10a is lower than the rubber extrudate R immediately after extrusion, and is, for example, about 30 ° C to 50 ° C. Other structures can be used as long as the peripheral surface 10a can be cooled. The gap adjusting mechanism 12 and the cooling means 13 can be optionally provided. The support shaft of the upper roller 10 is supported by a gap adjusting mechanism 12.

  When extruding the rubber extrudate R by the rubber extruding device 1 in the production line, a predetermined amount of unvulcanized rubber and a compounding agent are put into the cylinder 2. These materials are mixed and kneaded by the rotating screw 4. The unvulcanized rubber R1 that has been mixed and kneaded is softened to some extent (plasticized) and molded into a cross-sectional shape from the extrusion port 6 to the extrusion port 6 to form a sheet as an unvulcanized rubber extrudate R. Extruded. For example, a rubber extrudate R such as a tire tread rubber formed in a predetermined shape is manufactured by an extrusion method using the rubber extrusion device 1.

  At this time, the rubber R1 pushed forward by the screw 4 passes through the gap between the extrusion flow path 7 and the rectifying body 8 and is pushed out from the extrusion port 6. That is, the rubber R1 extruded from the cylinder 2 side by the screw 4 is extruded as a plate-like rubber extrudate R from the extrusion port 6 while being in contact with the inner surface of the extrusion flow path 7 and the surface of the rectifier 8. The rubber extrudate R passes between the pair of rollers 10 and is conveyed to a subsequent process.

  Here, in the conventional rubber extrusion apparatus illustrated in FIG. 8 that does not include the rectifying body 8, the rubber extrudate R is extruded from the extrusion port 6 while being in contact with the inner surface of the extrusion flow path 7. At this time, strain in a direction orthogonal to the extrusion direction remains in a portion that contacts the inner surface of the extrusion flow path 7. The inventor of the present invention observes and analyzes the shapes of a large number of rubber extrudates R by a conventional rubber extruding apparatus, and as shown in FIG. As a result, it has been found that it exhibits a behavior of extending in the tip direction (extrusion direction) due to this strain.

  Therefore, the tip of the rubber extrudate R has a shape in which the outer peripheral portion relatively protrudes in the tip direction (extrusion direction) and the central portion of the cross section is relatively recessed backward. That is, if a strain is left in the direction orthogonal to the extrusion direction immediately before the rubber extrudate R is extruded, the portion extends in the extrusion direction after extrusion, and accordingly, shrinkage of the central portion of the cross section to be contracted is suppressed. To do. The present invention utilizes this principle.

  In the rubber extrusion apparatus 1 of the present invention, as illustrated in FIG. 4, strain in a direction orthogonal to the extrusion direction remains in a portion that contacts the inner surface of the extrusion flow path 7 and the surface of the rectifying body 8. When the portion where the strain remains is extruded, the portion that extends in the extrusion direction due to the strain exhibits a behavior, so that the portion that extends in the extrusion direction increases compared to the conventional case. As a result, the contraction of the central portion of the cross section to be contracted is suppressed, and the contraction of the rubber extrudate R is suppressed as a whole.

  Moreover, in the present invention, since the rectifying member 8 protrudes forward from the front end face of the extrusion port 6, the rubber of the rubber extrudate R can be left with the maximum strain in the direction perpendicular to the extrusion direction. . Along with this, the effect of suppressing the shrinkage of the rubber extrudate R can be maximized.

  Therefore, according to the rubber extrusion device 1 of the present invention, the rubber extrudate R is contracted in the extrusion direction immediately after extrusion, while having a simple structure provided with the rectifying body 8 without requiring a large structure. It becomes possible to suppress. As a result, it is possible to shorten the time required until the rubber extrudate R does not contract.

  If the protruding length a forward from the front end face of the extrusion port 6 of the rectifying body 8 is about 10 mm, the rubber R1 temporarily divided by the rectifying body 8 is divided in the extruded flow. Soon after, the divided surfaces will naturally join together. That is, the divided surfaces of the rubber extrudate R are automatically joined together by the swell of unvulcanized rubber divided by the rectifier 8 (property to spread). Therefore, the rubber extrudate R can be used as it is sent to the next process of the production line.

  On the other hand, the greater the protrusion length a, the greater the shrinkage suppression effect of the rubber extrudate R by the rectifier 8. However, when the protruding length a is excessive, the rubber R1 temporarily divided by the rectifier 8 cannot be joined and integrated only with the unvulcanized rubber swell. That is, the risk that the rubber extrudate R remains divided by the rectifier 8 is increased. If the rubber extrudate R remains in a divided state, adverse effects such as inability to use the rubber extrudate R as it is will occur in the subsequent process.

  In the present invention, in order to solve this problem, a roller 10 that functions as a pressing mechanism is provided. In the rubber extruding apparatus 1, even when the rubber extrudate R is in a divided state, the peripheral surface 10a of the roller 10 contacts the opposing surface of the rubber extrudate R as illustrated in FIG. Since the split surfaces are joined by pressing the product R, it is possible to prevent the rubber extrudate R from remaining in a split state.

  Moreover, the peripheral surface 10a moves in the extrusion direction of the rubber extrudate R while being in contact with the rubber extrudate R. Therefore, the peripheral surface 10a in contact with the rubber extrudate R hardly imparts distortion in the extrusion direction to the rubber extrudate R. Therefore, the shrinkage suppressing effect of the rubber extrudate R by the rectifier 8 is not reduced.

  If the gap g between the opposed peripheral surfaces 10a is too small, the rubber extrudate R may be excessively deformed, and the shrinkage suppressing effect of the rubber extrudate R by the rectifier 8 may be reduced. Therefore, it is preferable to press the rubber extrudate R with a pressing force (for example, about 0.5 MPa) that does not deform the rubber extrudate R by appropriately setting the gap g between the opposed peripheral surfaces 10a.

  Since the cooling means 13 is provided in this embodiment, the rubber extrudate R immediately after extrusion can be pressed while being actively cooled by the peripheral surface 10 a cooled by the cooling means 13. Since the rubber extrudate R is usually cooled in the subsequent process, the cooling means 13 is provided, which has the advantage that the cooling time of the rubber extrudate R in the subsequent process can be shortened.

  When the extending length b of the rectifying body 8 is set to 10 mm or more, distortion in a direction orthogonal to the extrusion direction can be sufficiently applied to the rubber portion that contacts the surface of the rectifying body 8. Therefore, it is advantageous for suppressing the shrinkage of the rubber extrudate R in the extrusion direction. A suitable extension length b is, for example, 10 mm to 50 mm.

  By making the rectifying body 8 into a plate shape, it is possible to prevent the resistance to the rubber R1 passing therethrough from becoming excessive, and thus it becomes easy to extrude the rubber R1 smoothly. The flat plate-like rectifying body 8 is extended in the direction along the extending direction of the extrusion channel 7 so that the plane having a relatively large area faces the inner surface of the extrusion channel 7 having a relatively large area. . For example, in the case of the extrusion channel 7 having a quadrangular cross section, a rectifying body 8 having a quadrangular cross section is used, and in the case of the extrusion channel 7 having a circular cross section, the rectifying body 8 having a circular cross section is used. 7 and the rectifier 8 have the same cross-sectional shape (similar shape).

  If the cross-sectional area of the rectifying body 8 is excessive with respect to the cross-sectional area of the extrusion channel 7, the resistance to rubber becomes excessive, the rubber temperature becomes too high, or an excessive external force acts on the rectifying body 8. Such problems arise. Therefore, the ratio of the cross-sectional area of the rectifier 8 to the cross-sectional area of the extrusion channel 7 is preferably 40% or less, more preferably 5% to 30%, and still more preferably 5% to 20%.

  A plurality of rectifying bodies 8 can also be provided. In this case, the cross-sectional view of the extrusion flow path 7 is arranged such that the maximum separation distance between the surface of the rectifying body 8 and the inner surface of the extrusion flow path 7 and the maximum separation distance between adjacent rectification bodies 8 are 100 mm or less. It is preferable. Specifically, when the extrusion port 6 has a rectangular shape with a width dimension of 300 mm and a height dimension of 50 mm, for example, three rectifier bodies 8 with a width dimension of 10 mm and a height dimension of 5 mm are arranged in the width direction in the extrusion flow path 7. It is preferable that the widthwise interval between each other, the rightmost rectifier 8 and the right inner surface of the extrusion port 6, and the leftmost rectifier 8 and the left inner surface of the extrusion port 6 be equally spaced.

  Another embodiment of the rubber extrusion device 1 illustrated in FIGS. 6 and 7 differs from the previous embodiment only in the specifications of the pressing mechanism. In FIG. 6, the rubber extrudate R is indicated by a virtual line (two-dot chain line). In this embodiment, the pair of belt conveyors 11 function as a pressing mechanism.

  The two belt conveyors 11 disposed above and below are disposed in front of the tip 8 a of the rectifying body 8 and in the vicinity of the tip of the rectifying body 8. The conveying surfaces 11a of the belt conveyors 11 are in a state of being disposed so as to face the positions sandwiching the rubber extrudate R extruded from the extrusion port 6. The conveyance surface 11a of each belt conveyor 11 serves as a contact portion that contacts the opposing surface of the rubber extrudate R. Each belt conveyor 11 can be configured to rotate freely, or can be configured to be rotationally driven at a conveyance speed equivalent to the extrusion speed of the rubber extrudate R.

  In this embodiment, the belt conveyor 11 arranged on the lower side is fixed at a fixed position. The belt conveyor 11 disposed on the upper side is held by a gap adjusting mechanism 12 connected to a support pulley 13 so as to be vertically movable. By moving the upper belt conveyor 11 up and down, the gap g (shortest distance) between the conveying surfaces 11a facing each other of the belt conveyors 11 can be changed. Other structures can be used as long as the gap g between the transport surfaces 11a can be changed. For example, the gap g is set to the same size as the dimension of the extrusion port 6 in the thickness direction.

  The support pulley of the belt conveyor 11 is a cooling means 13 through which cooling water flows. The conveying surface 11 a is cooled by the cooling means 13. The temperature of the cooled conveyance surface 11a is lower than the rubber extrudate R immediately after extrusion, and is, for example, about 30 ° C to 50 ° C. Other structures can be used as long as the transport surface 11a can be cooled. The support pulley of the upper belt conveyor 11 is pivotally supported by a gap adjusting mechanism 12.

  The usage method of this embodiment is substantially the same as the previous embodiment, and the same effect can be obtained. That is, even if the rubber extrudate R is in a divided state, the respective conveying surfaces 11a come into contact with the opposing surfaces of the rubber extrudate R to press the rubber extrudate R. As a result, the split surfaces are joined, so that the rubber extrudate R can be prevented from remaining in a split state.

  Moreover, since the conveyance surface 11a moves in the extrusion direction of the rubber extrudate R while being in contact with the rubber extrudate R, the rubber extrudate R is hardly distorted in the extrusion direction. Therefore, the shrinkage suppressing effect of the rubber extrudate R by the rectifier 8 is not reduced.

  When the belt conveyor 11 (conveying surface 11a) is used as the pressing mechanism, the contact area with the surface of the rubber extrudate R can be increased as compared with the case where the roller 10 (circumferential surface 10a) is used. Accordingly, the rubber extrudate R can be more easily cooled by the cooling means 13.

  Further, when the belt conveyor 11 is used, as compared with the case where the roller 10 is used, the rubber extrudate R is sandwiched at a position closer to the extrusion port 6 and the rubber extrudate R is easily pressed for a longer time. Thereby, it is advantageous to prevent the rubber extrudate R from being deformed by its own weight during the period from when the rubber extrudate R is pushed out from the extrusion port 6 and pressed by the pressing mechanism.

DESCRIPTION OF SYMBOLS 1 Rubber extrusion apparatus 2 Cylinder 3 Head 4 Screw 5 Die 6 Extrusion port 7 Extrusion flow path 8 Rectifier 8a Front end 8b Rear end 9 Connection part 10 Roller (pressing mechanism)
10a Peripheral surface (contact part)
11 Belt conveyor (pressing mechanism)
11a Conveying surface (contact part)
12 Gap adjustment part 13 Cooling means R Rubber extrudate R1 Rubber

Claims (6)

In a rubber extrusion device comprising a cylindrical cylinder, a screw arranged in the cylinder, a head installed at the tip of the cylinder, and a die arranged at the tip of the head and having an extrusion port,
There is a tip at a position protruding forward from the front end surface of the extrusion port, a rectifying body extending from the tip toward the cylinder side to at least the inside of the extrusion flow path of the die, and more than the tip of the rectifying body A pressing mechanism disposed in front and in the vicinity of the tip of the rectifying body, the pressing mechanism having a contact portion disposed to face a position sandwiching the rubber extrudate from the extrusion port The rubber extrudate is extruded from the extrusion port by passing the rubber extruded by the screw between the inner surface of the extrusion flow path and the rectifier, and the contact portion is placed on the opposing surface of the rubber extrudate. The rubber extruding apparatus is configured to move in the extruding direction of the rubber extrudate and press the rubber extrudate while being in contact with each other.   The rubber extrusion device according to claim 1, wherein an extension length of the rectifying body from the front end surface of the extrusion port toward the cylinder is 10 mm or more.   The rubber extruding device according to claim 1, wherein the rectifying body is plate-shaped.   The press mechanism is a pair of rollers disposed with their peripheral surfaces facing each other at a position sandwiching the rubber extrudate, and the contact portion is a peripheral surface of the pair of rollers. The rubber extrusion apparatus described in 1.   The press mechanism is a pair of belt conveyors arranged with a conveyance surface facing a position sandwiching the rubber extrudate, and the contact portion is a conveyance surface of the pair of belt conveyors. The rubber extrusion apparatus in any one.   The rubber extrusion apparatus according to claim 1, further comprising a cooling unit that cools the contact portion, wherein the rubber extrudate is cooled by the contact portion cooled by the cooling unit.

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