JP6062252B2 - Unvulcanized rubber extrusion equipment - Google Patents

Description

The present invention, 4 after the type of unvulcanized rubber into close contact with each other, about the extruded City equipment unvulcanized rubber to extrude.

The extrusion City equipment of a conventional unvulcanized rubber, there is known, as described for example in Patent Document 1 below.

JP 2001-047494 A

  This has a block shape, and four types of unvulcanized rubbers of different types pass through it, and four rubber passages that merge in one region are formed. A head having an extrusion port through which the unvulcanized rubber that is in close contact is extruded is connected to the four rubber passages by being connected to the rear surface of the head in a vertically separated state. In addition, it is provided with four transfer means composed of, for example, a screw-type extruder, which transfers the uncured rubber at normal temperature toward the joining area while heating.

However, in such extrusion City equipment of a conventional unvulcanized rubber, since you have to put the heat in the middle transfer by the transfer means the unvulcanized rubber supplied at room temperature, any unreacted The vulcanized rubber is likely to be insufficiently heated, and when such insufficient heating occurs, the quality of the extruded belt-like member is deteriorated, for example, there is a problem that unevenness is generated. Therefore, in order to eliminate the shortage of heat input as described above, it may be possible to use a transfer means having a large value obtained by dividing the length L of the cylinder barrel by the cylinder diameter D. Since the temperature of the unvulcanized rubber is likely to rise, the transfer speed of the unvulcanized rubber (screw rotation speed) must be limited to a speed at which no rubber is burnt, resulting in a reduction in work efficiency. There was a problem that it would end up. And such a subject becomes more remarkable when extruding the top tread for trucks and buses containing natural rubber.

This invention aims to provide an extrusion City equipment of the unvulcanized rubber can be easily improve the quality of unvulcanized rubber which is extruded while improving work efficiency.

These objects exhibit block-shaped, with different four unvulcanized rubber passes inside, four rubber passage merging in one region is formed, joins in the merging region Connected to each of the four rubber passages by being connected to a head having an extrusion port on the lower surface through which the unvulcanized rubber that is in close contact with each other is extruded and a side surface approximately 90 degrees apart of the head. And an unvulcanized rubber extruding device comprising four transfer means for transferring the unvulcanized rubber whose temperature has been raised by heating to the merging zone as it is, Extrusion head formed with a storage groove extending in the direction, and a die that is detachably stored in the storage groove of the extrusion head, the junction area is disposed inside, and the extrusion port is formed on the lower surface And one of the transfer means is connected to the front surface of the die holder, and the unvulcanized rubber from the transfer means is transferred to the joining area through a rubber passage extending in the longitudinal direction in the die holder. On the other hand, one of the remaining transfer means is connected to the rear surface of the die holder, and unvulcanized rubber from the transfer means is transferred to the merge area through a rubber passage extending in the longitudinal direction in the die holder. This can be achieved by a vulcanized rubber extrusion device.

  In this invention, after the unvulcanized rubber whose temperature has been raised by heating is supplied to the transfer means, the unvulcanized rubber is transferred as it is to the merging zone by the transfer means and is brought into close contact with each other and extruded as a belt-like member. Since extrusion is performed from the mouth, there is no case where any unvulcanized rubber is insufficiently heated, and as a result, the quality of the extruded belt-shaped member can be easily improved. Moreover, even if the transfer rate of the unvulcanized rubber is increased, the rubber is not burned, and the work efficiency can be improved. Further, the heating means for heating the unvulcanized rubber supplied to the transfer means is connected to the four places on the side surface of the head that is approximately 90 degrees apart. A large mutual interval can be taken, and the situation where they interfere with each other can be easily prevented.

Further, the distribution of the unvulcanized rubber constituting the strip-like member, if there is a change in the amount, only by replacing the one corresponding die holder with ease can be addressed, the work efficiency is easily improved . Moreover, since the unvulcanized rubber passing through the rubber passage formed in the die holder has a short passage distance, it is possible to prevent a situation in which it stays in the middle, thereby easily suppressing the tearing or scorching of the rubber. be able to. Furthermore, if it comprises as described in Claim 2 , the work efficiency at the time of replacing | exchanging die holders can be improved easily. And this invention is suitable for shaping | molding of the strip | belt-shaped member (top tread) as described in Claim 3 .

It is a schematic plan view which shows Embodiment 1 of this invention. It is the II arrow directional view of FIG. 1 where one part was fractured | ruptured. It is a perspective view of a die holder. It is II-II arrow sectional drawing of FIG. It is sectional drawing of the strip | belt-shaped member extruded. It is a schematic top view similar to FIG. 1 explaining the state at the time of replacement | exchange of a die holder.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1-5, 11 is an extrusion apparatus which extrudes as a strip | belt-shaped member B, after making 4 types of unvulcanized rubbers M contact | adhere, This extrusion apparatus 11 exhibits block shape, and a central axis is a perpendicular direction here And a head 12 having a columnar shape extending in the direction. The head 12 may have a rectangular parallelepiped shape or a cubic shape and may have four orthogonal side surfaces. Reference numerals 13 and 14 denote first and second extruders which are arranged around the head 12 at a distance of approximately 180 degrees and extend in the left-right direction. The first and second extruders 13 and 14 The tip is connected and fixed to the side surface (left surface and right surface) of the head 12 at a distance of approximately 180 degrees. Each of the first and second extruders 13 and 14 includes a rotatable screw 15, and these screws 15 rotate by receiving a rotational driving force from the drive unit 16. Unvulcanized rubber M introduced into the first and second extruders 13 and 14 is transferred toward the head 12 from hoppers 17 and 18 formed at the rear ends of the extruders 13 and 14.

  Here, the unvulcanized rubber M introduced into the first and second extruders 13 and 14 through the hoppers 17 and 18 is two types of unvulcanized rubbers having different types (compounding compositions). When the belt-like member B is a top tread of a truck / bus tire, the unvulcanized rubber M1 charged into the first extruder 13 becomes, for example, a cap rubber CG as shown in FIG. The unvulcanized rubber M2 charged into the machine 14 becomes the base rubber BG. Further, the unvulcanized rubber M put into the first and second extruders 13 and 14 is heated by a heating roll (not shown), a heating screw or the like, which is installed immediately above the hoppers 17 and 18. (Kneading) means that the material is sufficiently heated (kneaded) and the temperature rises to a high temperature below the vulcanization start temperature. As a result, the inside of the first and second extruders 13 and 14 is unvulcanized. When the rubber M1 and M2 are transferred toward the head 12, almost no heating is performed. In the present invention, unvulcanized rubber M2 (base rubber BG) may be transferred by the first extruder 13, and unvulcanized rubber M1 (cap rubber CG) may be transferred by the second extruder 14.

  The head 12 has an extrusion head 23 in which a storage groove 22 extending in the front-rear direction is formed on the lower surface, and a die holder 24 that is stored in the storage groove 22 and extends in the front-rear direction and has an octagonal cross section. When the die holder 24 is housed in the housing groove 22 of the extrusion head 23, the clamps 25 are pressed against the lower surfaces of both ends of the width direction of the die holder 24, so that the die holder 24 is positioned and fixed to the extrusion head 23. Is done. As a result, the die holder 24 is detachably stored in the storage groove 22 of the extrusion head 23. Here, the inside of the extrusion head 23 communicates with the front end openings of the first and second extruders 13 and 14, and unvulcanized rubber M1 extruded from the first and second extruders 13 and 14, First and second main rubber passages 26 and 27 for guiding M2 to the bottom surface of the storage groove 22, that is, the top surface of the die holder 24 are formed. The die holder 24 includes a holder main body 29 having a fitting recess 28 formed on the upper surface in the longitudinal center, and an insert block 30 fitted and fixed to the first extruder 13 side of the fitting recess 28, that is, the left side. And the insert block 31 fitted to the second extruder 14 side of the fitting recess 28, that is, the right side.

  The insert block 30 communicates with the first main rubber passage 26 between the second extruder 14 side (right side) of the insert block 30 and the extrusion head 23, and approaches the second extruder 14 side downward. A first secondary rubber passage 32 is formed, and unvulcanized rubber M1 is guided to the first secondary rubber passage 32 from the first main rubber passage 26. On the other hand, between the first extruder 13 side (left side) of the insert block 31 and the extrusion head 23, it communicates with the second main rubber passage 27 and approaches the first extruder 13 side as it goes downward. The second secondary rubber passage 33 is formed, and the unvulcanized rubber M2 is guided to the second secondary rubber passage 33 from the second main rubber passage 27. The first and second sub-rubber passages 32 and 33 merge at the central portion in the thickness direction of the die holder 24 to form one space area, that is, a merge area 34. As a result, the unvulcanized rubbers M1 and M2 guided from the first and second main rubber passages 26 and 27 to the first and second sub rubber passages 32 and 33 gradually approach each other as they flow downward. In the basin 34, they merge and adhere to each other. A die 35 is detachably attached to the lower part of the die holder 24, and an extrusion port 36 having the same shape as the cross-sectional shape of the belt-like member B is formed between the die 35 and the die holder 24. Yes.

  Thus, the head 12 (die holder 24) has an extrusion port 36 through which the unvulcanized rubber M is extruded. As described above, the unvulcanized rubbers M1 and M2 are brought into close contact with each other by joining in the joining region 34 disposed inside the die holder 24, and then pass through the extrusion port 36. The unvulcanized rubbers M1 and M2 thus formed are formed into a strip shape that is formed in substantially the same shape as the cross-sectional shape of the extrusion port 36. The strip-shaped unvulcanized rubber M1, M2 continuously molded by the extrusion device 11 in this way is supplied downward while hanging from the die holder 24, and then placed on a transport conveyor (not shown), It is carried out to the next process.

  Reference numeral 40 denotes a third extruder as a transfer means extending in the front-rear direction and disposed in front of the head 12, and the third extruder 40 has substantially the same configuration as the first extruder 13, In the third extruder 40, an unvulcanized rubber M of a different type from the unvulcanized rubber M introduced into the first and second extruders 13 and 14 through a hopper 41, here a mini side rubber shown in FIG. Unvulcanized rubber M3, which will be MS, is introduced. Note that this unvulcanized rubber M3 is also one that has been sufficiently heated to raise the temperature in the same manner as the unvulcanized rubber M1, M2, and as a result, the inside of the third extruder 40 is unvulcanized rubber. When M3 is transferred toward the head 12, little heating is performed.

  On the other hand, a fourth extruder 42 serving as a transfer means extending in the front-rear direction and also having the same configuration as that of the first extruder 13 is disposed behind the head 12, and a hopper 43 is disposed in the fourth extruder 42. Through the first, second, and third extruders 13, 14, and 40, the unvulcanized rubber M that is different in type from the unvulcanized rubber M, that is, the undercushion rubber UC shown in FIG. Vulcanized rubber M4 is introduced. The unvulcanized rubber M4 is also a material that has been sufficiently heated to raise the temperature in the same manner as the unvulcanized rubbers M1, M2, and M3. As a result, the inside of the fourth extruder 42 is unvulcanized. When the vulcanized rubber M4 is transferred toward the head 12, almost no heating is performed. In the present invention, unvulcanized rubber M4 (undercushion rubber UC) may be transferred by the third extruder 40, and unvulcanized rubber M3 (mini side rubber MS) may be transferred by the fourth extruder 42. . The first, second, third, and fourth extruders 13, 14, 40, and 42 described above constitute four transfer means that are disposed around the head 12 at a distance of approximately 90 degrees in the circumferential direction. In the present invention, a plunger may be used as the transfer means. In this embodiment, since it is only necessary to add the third and fourth extruders 40 and 42 to the head 12, the first and second extruders 13 and 14 which are existing facilities, the equipment cost can be reduced. can do.

  46 is a third main rubber passage formed in the left side portion close to the first extruder 13 inside the die holder 24 (holder main body 29) and extending in the substantially front-rear direction. The front end of the third main rubber passage 46 Opens at the front of the die holder 24 (holder body 29), while its rear end ends at the rear end of the die holder 24. Then, at the front surface of the die holder 24, specifically, at the front end opening of the third main rubber passage 46, any one transfer means, here, the tip of the third extruder 40 is attached / detached via a quick joint or the like. Connected as possible. As a result, when the third extruder 40 is connected to the die holder 24, the unvulcanized rubber M3 can be supplied from the third extruder 40 to the third main rubber passage 46. Reference numeral 47 denotes a third secondary rubber passage formed between the insert block 30 and the holder body 29 and extending in the front-rear direction. The third secondary rubber passage 47 is not shown from the third main rubber passage 46. Unvulcanized rubber M3 is supplied through the passage.

  Reference numeral 50 denotes a fourth main rubber passage formed in the right side portion close to the second extruder 14 inside the die holder 24 (holder main body 29) and extending substantially in the front-rear direction. The end opens to the rear surface of the die holder 24 (holder body 29), while the front end ends at the front end of the die holder 24. Then, at the rear surface of the die holder 24, more specifically, at the rear end opening of the fourth main rubber passage 50, any one of the remaining transfer means, here, the front end portion of the fourth extruder 42 passes through a quick joint or the like. And are detachably connected. As a result, when the fourth extruder 42 is connected to the die holder 24, the unvulcanized rubber M4 can be supplied from the fourth extruder 42 to the fourth main rubber passage 50. Reference numeral 51 denotes a fourth secondary rubber passage formed between the insert block 31 and the holder body 29 and extending in the front-rear direction. The fourth secondary rubber passage 51 is not shown in the figure from the fourth main rubber passage 50. Unvulcanized rubber M4 is supplied through the passage.

  Reference numeral 54 denotes two notches formed at the lower ends of the insert block 30 in the front-rear direction, and the unvulcanized rubber M3 is fed from the third auxiliary rubber passage 47 through the notches 54 to the joining region 34. Are supplied respectively. The unvulcanized rubber M3 supplied to the merge area 34 through the notches 54 is in close contact with the outer surfaces of both end portions of the unvulcanized rubber M1 and M2 in close contact with each other, as shown in FIG. B mini side rubber MS is configured. 55 is a notch formed at the lower end of the insert block 31 at the center in the front-rear direction. Through this notch 55, the unvulcanized rubber M4 is passed from the fourth sub-rubber passage 51 to the merge region 34. Supplied. The unvulcanized rubber M4 supplied to the merge area 34 through the notch 55 is in close contact with the back surfaces of the unvulcanized rubbers M1 and M2 that are in close contact with each other (the outer surface of the base rubber BG). Construct cushion rubber UC.

  The first main and sub rubber passages 26 and 32 are passed through the first rubber passage 58 through which the unvulcanized rubber M1 passes, and the second main and sub rubber passages 27 and 33 are formed as a whole by the unvulcanized rubber M2. The third main and sub rubber passages 46 and 47 and the cutout 54 extend in the longitudinal direction in the die holder 24 as a whole and pass through the second rubber passage 59 through which the unvulcanized rubber M3 passes. In addition, the fourth main and auxiliary rubber passages 50 and 51 and the notch 55 constitute a fourth rubber passage 61 which extends in the longitudinal direction in the die holder 24 and through which the unvulcanized rubber M4 passes. As described above, the four transfer means (first, second, third, and fourth extruders 13, 14, 40, and 42) respectively connected to the four positions on the side surface of the head 12 that are approximately 90 degrees apart are the four. The four rubber passages (first, second, third, and fourth rubber passages 58, 59, 60, and 61) are connected to the four transfer means (first, second, third, and fourth, respectively). When the unvulcanized rubber M (unvulcanized rubber M1, M2, M3, M4), which has been heated by the extruder 13, 14, 40, 42), is heated, By operating in synchronism, the unvulcanized rubber M is transferred toward the merge zone 34 as it is, that is, with almost no temperature change.

  In this way, the four different types of unvulcanized rubber M1 as the cap rubber CB, unvulcanized rubber M2 as the base rubber BG, unvulcanized rubber M3 as the mini-side rubber MS, and uncured rubber UC The vulcanized rubber M4 has four transfer means, that is, the first, second, third, and fourth extruders 13, 14, 40, 42 to the four rubber passages, that is, the first, second, and second. 3. After being supplied to the fourth rubber passages 58, 59, 60, 61, respectively, through these first, second, third, and fourth rubber passages 58, 59, 60, 61, one region, that is, the merge region 34 Are joined together in the joining zone 34 and brought into close contact with each other. Thereafter, the four types of unvulcanized rubber M that are in close contact with each other are extruded through the extrusion port 36 of the head 12, and a belt-like member B having a predetermined cross-sectional shape, here, a top tread for trucks and buses is formed. As described above, the extrusion device 11 of this embodiment is suitable for molding a top tread in which natural rubber for trucks and buses, which are large tires, is blended. The four types of unvulcanized rubber M described above can be appropriately changed depending on the type of the band-shaped member B to be molded.

  In this embodiment, the unvulcanized rubber M whose temperature has been increased by being heated as described above is supplied to the first, second, third, and fourth extruders 13, 14, 40, and 42. After that, the unvulcanized rubber M is directly transferred to the joining area 34 by these first, second, third, and fourth extruders 13, 14, 40, and 42, and is brought into close contact with each other to form an extrusion port 36 as a band member B. Therefore, any unvulcanized rubber M will not be insufficiently heated, and as a result, the quality of the extruded belt-like member B can be easily improved. Moreover, even if the transfer rate of the unvulcanized rubber M is increased, rubber burn does not occur, and the work efficiency can be improved. Furthermore, the heating means for heating the unvulcanized rubber M supplied to the first, second, third, and fourth extruders 13, 14, 40, and 42 are the first, second, third, Since the fourth extruders 13, 14, 40, and 42 are respectively connected to four locations on the side surface of the head 12 that are approximately 90 degrees apart, the mutual spacing between these heating means can be made large, Interferences can be easily prevented.

  Further, as described above, the head 12 includes an extrusion head 23 in which a storage groove 22 is formed, and a die holder 24 in which a merging area 34 is disposed in the storage groove 22 of the extrusion head 23 detachably. And one of the transfer means, here, the third extruder 40 is connected to the front surface of the die holder 24, and the unvulcanized rubber M3 from the third extruder 40 is connected to the first inside the die holder 24. 3. While transferring to the merge zone 34 through the rubber passage 60, one of the remaining transfer means, here, the fourth extruder 42 is connected to the rear surface of the die holder 24 and unvulcanized from the fourth extruder 42. Since the rubber M4 is transferred to the merge zone 34 through the fourth rubber passage 61 in the die holder 24, when the distribution and amount of each unvulcanized rubber M constituting the belt-like member B are changed, the die holder Simply replace 24 with a compatible one. To be able to cope, work efficiency can be easily improved. Furthermore, when a part of the third and fourth rubber passages 60 and 61 is provided in the extrusion head 23, it is necessary to replace the extrusion head 23 itself in accordance with the change of the belt-like member B. It can be easily handled by simply replacing the holder 24. Moreover, the unvulcanized rubber M3, M4 passing through the third and fourth rubber passages 60, 61 formed in the die holder 24 has a short passage distance, so that it is possible to prevent a situation where the unvulcanized rubber M3, M4 stays in the middle. Further, it is possible to easily suppress the tearing or scorching of rubber.

  In FIGS. 1 and 6, reference numeral 65 denotes a guide rail extending in the front-rear direction and laid directly under both the third and fourth extruders 40 and 42 when connected to the die 12. Third and fourth extruders 40 and 42 are movably supported. When the connection between the third and fourth extruders 40 and 42 and the head 12 (die holder 24) is released and the third and fourth extruders 40 and 42 are removed from the head 12, the third The extruder 40 can move forward while being guided by the guide rail 65, while the fourth extruder 42 can move backward while being guided by the guide rail 65 and can be separated from the head 12. 66 is a pair of guide rails installed in front of the head 12 and extending in the left-right direction while being orthogonal to the guide rails 65. The third extruder 40 intersects the guide rails 65 on these guide rails 66. When it has moved to the position, the third extruder 40 is supported from the guide rail 65 so as to be movable in the left-right direction.

  Reference numeral 69 denotes a mounting table on which a new die holder 24 of a different type from the current die holder 24 mounted on the head 12 (forming a different type of belt-like member B) is mounted. Then, as described above, the third and fourth extruders 40 and 42 are detached from the die holder 24 and detached from the head 12, and then the mounting table 69 and the new die holder 24 are moved along the guide rail 66. After moving to the guide rail 65 at the crossing position of the guide rail 66 and the guide rail 65, when moving backward along the guide rail 65 to just below the head 12, the current die holder 24 is renewed. It is exchanged for a new die holder 24. When changing to a different type of die holder 24 in this way, if both the third and fourth extruders 40 and 42 described above are removed from the die holder 24 and removed, the die holder 24 can be replaced. The work efficiency can be easily improved.

Next, the operation of the first embodiment will be described.
Now, the leading end of the third extruder 40 is connected to the front surface of the die holder 24 of the head 12, and the leading end of the fourth extruder 42 is connected to the rear surface of the head 12. As a result, a block shape is formed. Assume that four transfer means, that is, first, second, third, and fourth extruders 13, 14, 40, and 42, are connected to four locations on the side surface of the head 12 that is approximately 90 degrees apart. In this state, when the first, second, third and fourth extruders 13, 14, 40 and 42 are operated synchronously and the screw 15 is rotated, the first, second, Four types of unvulcanized rubber M1, M2, M3, and M4, which have been heated and fed into the third and fourth extruders 13, 14, 40, and 42, respectively, It is transported toward.

  Here, the unvulcanized rubbers M1 and M2 supplied from the first and second extruders 13 and 14 to the first and second rubber passages 58 and 59 of the head 12 are converted into the first and second rubber passages 58, respectively. , 59, are transferred as they are toward the merging zone 34 without changing the temperature, and merged in the merging zone 34 and closely contact each other. On the other hand, unvulcanized rubber M3 and M4 supplied from the third and fourth extruders 40 and 42 to the third and fourth rubber passages 60 and 61 of the head 12 (die holder 24) While passing through the third and fourth rubber passages 60 and 61, the temperature is not changed and is transferred as it is toward the same merging zone 34 as described above. The rubber M1 and M2 are in close contact with the outer surface and the back surface at both ends in the width direction. The unvulcanized rubbers M (unvulcanized rubbers M1, M2, M3, M4) that are in close contact with each other in the merging area 34 are then extruded downward from the extrusion port 36 to form the band-shaped member B. At this time, if the extruded belt-like member B is a top tread for trucks and buses, the unvulcanized rubber M1 is the cap rubber CB, the unvulcanized rubber M2 is the base rubber BG, and the unvulcanized rubber M3. Is the mini side rubber MS and the unvulcanized rubber M4 is the under cushion rubber UC. The belt-like member B formed by the extrusion device 11 in this way is supplied downward while hanging from the die holder 24, and then is carried out to the next process by the conveyor.

  Here, when the type of the belt-like member B to be molded is changed, the current die holder 24 is replaced with a new die holder 24 corresponding to the belt-like member B to be changed. After the fourth extruder 40, 42 and the head 12 (die holder 24) are disconnected and the third and fourth extruders 40, 42 are removed from the head 12, the third extruder 40 is guided. On the other hand, the fourth extruder 42 is moved rearward along the guide rail 65 and separated from the head 12 along the rail 65. Thereafter, the third extruder 40 is moved rightward along the guide rail 66. At this time, after the mounting table 69 and the new die holder 24 are moved to the right along the guide rail 66, they are moved to the position immediately below the head 12 along the guide rail 65, and the current die holder 24 is moved at the position. Replace with a new die holder 24.

  The present invention can be applied to the industrial field in which four types of unvulcanized rubber are brought into close contact with each other and then extruded.

11… Extruder 12… Head
13, 14, 40, 42 ... transport means 22 ... storage groove
23 ... Extrusion head 24 ... Die holder
34 ... Merging area 36 ... Extrusion port
58, 59, 60, 61 ... Rubber passage M ... Unvulcanized rubber B ... Strip member CG ... Cap rubber
BG ... Base rubber MS ... Mini side rubber
UC ... Under cushion rubber

Claims (3)

It has a block shape, and four types of unvulcanized rubber of different types pass through it, and four rubber passages that merge in one region are formed. It is connected to the four rubber passages by being respectively connected to the head having an extrusion port through which the vulcanized rubber is extruded on the lower surface and four sides of the head that are approximately 90 degrees apart, and heated. In the unvulcanized rubber extruding device comprising four transfer means for transferring the unvulcanized rubber whose temperature has risen as it is toward the merging zone, a storage groove extending in the front-rear direction is formed on the lower surface of the head. And a die holder that is detachably accommodated in a storage groove of the extrusion head, the merging area is disposed inside, and the extrusion port is formed on the lower surface. And one of the transfer means is connected to the front surface of the die holder, and unvulcanized rubber from the transfer means is transferred to the merge area through a rubber passage extending in the longitudinal direction in the die holder, The one transfer means is connected to the rear surface of the die holder, and unvulcanized rubber from the transfer means is transferred to the joining area through a rubber passage extending in the longitudinal direction in the die holder. Vulcanized rubber extrusion equipment. Prior to said die holder, and detachable transfer means respectively connected to the rear surface, different when changing the type of die holder, according to claim 1, wherein that the two transfer means so as to disengage removed from the die holder Unvulcanized rubber extrusion equipment. The top tread base rubber or cap rubber is supplied from the transfer means connected to the left and right surfaces of the head, respectively, while the under cushion rubber or mini side rubber is supplied from the transfer means connected to the front and rear surfaces of the die holder, respectively. supplied, extrusion port unvulcanized rubber extruding apparatus according to claim 1, wherein the top tread has as extruded for trucks and buses as strips.

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