JP2007185857A - Mold for rubber roller and method for manufacturing rubber roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold for a rubber roller constituted so as to suppress the remaining of rubber flash in the overflow part of the mold to facilitate the removal of the rubber flash, and a method for manufacturing a rubber roller. <P>SOLUTION: The mold for the rubber roller includes first and second piece molds fitted to each other at the openings provided to both end parts of a cylindrical mold and the shaft body head in the cylindrical mold by the first and second piece molds and is constituted so that a rubber material is injected in the cylindrical mold from either one of the piece molds and the rubber roller is molded on the outer periphery of the shaft body. The piece mold on a non-injection side of the rubber material has a taper-shaped fitting part, which is fitted to the opening of the cylindrical mold and has an angle θ1 of inclination with respect to the center axis in the longitudinal direction of the cylindrical mold, and a circumferential groove 1b becoming a liquid sump for liberating the irregularity of the injection amount of the material and the groove 1c in the longitudinal direction of the cylindrical mold for guiding the overflow material to the circumferential groove are provided to the taper-shaped fitting part are provided to the tape-shaped fitting part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a molding die for a rubber roller and a method for manufacturing the rubber roller.
In particular, in various rubber rollers used in OA equipment such as printers and copying machines, a rubber roller molding die used when a thermosetting liquid rubber material is injected into a molding die and cured to form a rubber roller. The present invention relates to a method for manufacturing a rubber roller.

Conventionally, a thermosetting liquid rubber material is injected into a molding die, and as a molding die for a rubber roller used when molding a rubber roller, for example, at least of a cylindrical pipe die and two pieces attached to both ends thereof A mold composed of three members is known.
The molding die in the conventional example of such a rubber roller has a structure as shown in FIGS. 4 and 5, for example, and one of the two pieces attached to both ends has a thermosetting property. At least one injection port for injecting the liquid rubber material is opened.
The other non-injection side piece 11 is provided with an overflow hole or groove 11a in order to escape the injection variation of the rubber material.
In such a configuration, if the injected material stops and cures in the middle of the overflow hole or groove 11a, it becomes difficult to remove the rubber in this portion.
Therefore, as shown in FIG. 5, a liquid reservoir 11b is further provided at the outlet of the small hole or groove 11a for overflow.
By constituting in this way, after the rubber material is hardened by overflowing the material to the liquid reservoir portion 11b, the overflow hole or groove 11a integrated with the rubber of the liquid reservoir portion 11b is formed. The rubber can be removed.

At this time, in order to make it difficult to cut the rubber material inside the overflow hole or groove 11a, there is one in which the hole diameter or groove size is increased continuously or stepwise toward the outside of the mold cavities (for example, patents). Reference 1).
Furthermore, there is a method in which a groove with a small air vent is provided in the piece 11 on the non-injection side so as to eliminate material overflow (for example, see Patent Document 2).
JP 2003-39452 A JP 2003-200440 A

However, the following inconveniences may occur in the conventional example of Patent Document 1 or Patent Document 2 described above.
For example, as in Patent Document 1, in the case where the overflow hole diameter and the groove size are increased continuously or stepwise toward the outside of the mold cavity, unnecessary rubber burrs increase.
In some cases, the rubber in the liquid reservoir 11b and the overflow hole or groove 11a is cut, and only the rubber burrs in the liquid reservoir 11b are removed, leaving rubber burrs in the overflow hole or groove 11a. Occurs.

In Patent Document 2 of the above-described conventional example, it is possible to suppress the increase in unnecessary rubber burrs as described above by eliminating overflow, but on the other hand, by the rubber material that slightly enters the small groove of the air vent, Small rubber burrs are generated.
This small rubber burr is extremely difficult to remove, and it will stick to the surface of the rubber roller or remain on the inner surface of the pipe mold body 2 or the non-injection piece 11 itself.
Furthermore, in the case of a conductive rubber roller such as a charging roller or a developing roller, if the overflow is eliminated, a large pressure is applied when the rubber material in the mold cavity is thermally cured, which may cause uneven electrical resistance. There is sex.

  In view of the above problems, an object of the present invention is to provide a molding die for a rubber roller that suppresses the remaining of rubber burrs in an overflow portion of the die and facilitates removal of the rubber burrs, and a method for manufacturing the rubber roller. .

In order to solve the above-mentioned problems, the present invention provides a molding die for a rubber roller and a method for producing the rubber roller configured as follows.
The present invention is characterized in that a molding die for a rubber roller is configured as follows.
That is, the molding die of the rubber roller of the present invention is
A cylindrical mold with both ends open;
A first piece type mated with one of the openings at both ends and a second piece type mated with the other;
A shaft that is arranged in the cylindrical mold and can be held by a holding portion formed in the first piece type and the second piece type;
A rubber roller for injecting a rubber material into the cylindrical mold from the side of either the first piece type or the second piece type, and molding a rubber roller on the outer periphery of the shaft body Mold,
The piece of the first piece type or the second piece type on the side where the rubber material is not injected is in relation to the central axis in the longitudinal direction of the cylindrical die that fits into the opening of the cylindrical die. Having a tapered fitting portion with an inclination angle θ1;
A circumferential groove serving as a liquid reservoir for releasing variation in the amount of material injected into the tapered fitting portion, and a longitudinal direction of a cylindrical mold for guiding the overflowed material to the circumferential groove One or more grooves are provided.
Further, the molding die of the rubber roller of the present invention is a mating portion where the tapered fitting portion in the piece die mates with the cylindrical die,
An air vent groove communicating with the outside from the circumferential groove is formed in either the tapered fitting portion in the piece shape or the mating portion on the cylindrical mold side. It is a feature.
In the rubber roller molding die of the present invention, the circumferential groove has an angle θ2 formed by the bottom of the circumferential groove and the longitudinal center axis of the cylindrical die of 0 ° or more. ,
In addition, the angle θ2 formed is smaller than the inclination angle θ1 of the tapered fitting portion in the piece shape.
Further, in the molding die for the rubber roller of the present invention, one or more grooves in the longitudinal direction of the cylindrical mold are such that the angle θ3 formed by the bottom of the groove and the central axis in the longitudinal direction of the cylindrical mold is 0. It is characterized by being over °.
Moreover, the molding die of the rubber roller of the present invention is
A cylindrical mold having both ends opened, a first piece mold mating with one of the openings at both ends, a second piece mold mating with the other, and the first mold disposed in the cylindrical mold Using a molding die of a rubber roller having a shaft body that can be held by a holding portion formed in a piece shape and a second piece shape,
A rubber roller manufacturing method in which a rubber material is injected into the cylindrical mold from the side of either the first piece mold or the second piece mold, and a rubber roller is molded on the outer periphery of the shaft body. And
As the rubber roller molding die, the rubber roller is manufactured using any of the above-described rubber roller molding dies.
Further, in the rubber roller manufacturing method of the present invention, when the rubber material is injected, an injection syringe is used for injection of the rubber material, and the injection syringe is driven by a motor,
The method has a step of controlling injection of the rubber material based on a control torque set in the motor.
In the rubber roller manufacturing method of the present invention, the control torque set in the motor is smaller than the torque required to reach one or more grooves in the longitudinal direction of the cylindrical mold. It is characterized by being set.
Further, in the rubber roller manufacturing method of the present invention, when injecting the rubber material, an injection syringe is used for injecting the rubber material, and the injection syringe is driven by a hydraulic cylinder,
The method has a step of controlling injection of the rubber material based on an oil pressure set in the hydraulic cylinder.
Further, the rubber roller manufacturing method of the present invention is based on the oil pressure required when the hydraulic pressure set in the hydraulic cylinder reaches a groove that leads to one or more grooves in the longitudinal direction of the cylindrical mold. It is characterized by being set to a low oil pressure.

  According to the present invention, it is possible to realize a molding die for a rubber roller and a method for manufacturing the rubber roller, which can prevent the rubber burr from remaining in the overflow portion of the die and facilitate the removal of the rubber burr.

Next, an embodiment of the present invention will be described.
FIG. 1 shows a schematic configuration of the entire molding die of the rubber roller used for manufacturing the rubber roller of the present embodiment.
FIG. 2 is a diagram for explaining the configuration of the non-injection piece of the mold in the present embodiment.
2A is a front view of the non-injection side piece, FIG. 2B is a side view of the non-injection side piece, and FIG. 2C is an XX cross section.
In FIG. 1, 1 is a non-injection side piece, 2 is a pipe mold body, 3 is an injection side piece, and 4 is a rubber roller shaft.
In FIG. 2, reference numeral 1a denotes a tapered fitting portion on the non-injection side piece, and 1b denotes a circumferential groove serving as a liquid pool for releasing variation in the injection amount.
Further, 1c is a groove in the longitudinal direction of the shaft body (hereinafter referred to as the axial direction) for guiding the overflowed material to a circumferential groove, and 1d is a groove for an air vent.

In the present embodiment, at least one circumferential groove 1b and at least one tapered fitting portion 1a having a taper shape with an inclination angle θ1 with respect to the longitudinal central axis of the pipe mold body in the non-injection side piece. The structure which provided the groove | channel 1c of the axial direction more than this can be taken.
According to the above configuration, when the rubber roller is taken out from the molding die, the rubber burr due to the rubber material overflowing in the circumferential groove 1b and the axial groove 1c is discharged to the outside of the molding die integrally with the rubber roller. It becomes possible to do.
At that time, the bottom of the circumferential groove 1b is non-extruded so as not to pull the rubber burr formed in the circumferential groove 1b when the non-injection piece 1 is removed from the pipe mold body 2. It is preferable that an angle θ2 formed by the longitudinal axis of the pipe mold body of the injection piece 1 is 0 ° or more.
If the angle θ2 formed is equal to or greater than the inclination angle θ1 of the tapered fitting portion 1a in the non-injection piece 1, the circumferential groove 1b is not formed, and the formed angle θ2 is less than θ1. There is a need to.
Further, the volume of the circumferential groove 1b formed when the non-injection piece 1 is closed in the pipe mold main body 2 varies depending on the inner diameter of the pipe mold main body 2, the dimensional tolerance of the rubber roller shaft 4, and the like. It is preferable to make it larger than the amount of material injection.

Further, the angle θ3 formed by the bottom of the axial groove 1c for guiding the overflow material to the circumferential groove 1b and the longitudinal center axis of the pipe mold body of the non-injection piece 1 is the following angle: It is preferable to do this.
That is, when the non-injection piece 1 is removed from the pipe mold body 2, the angle is preferably set to 0 ° or more so as not to pull the rubber burr formed in the axial groove 1c.
At that time, the number of the axial grooves 1c may be one, but considering the flow of the material in the circumferential direction, it is preferable to provide four or more in the circumferential distribution.

Further, the air vent groove 1d communicating with the outside from the circumferential groove 1b can be formed in at least one tapered fitting portion of the pipe mold body 2 or the non-injection piece 1.
There are no particular restrictions on the shape, number, etc., but considering the flow of material in the circumferential direction, it is preferable to provide four or more in a circumferential distribution.
In order to prevent the overflowed rubber material from flowing into the air vent, the total cross-sectional area is preferably smaller than the total cross-sectional area of the axial groove 1c that guides the overflow material to the circumferential groove 1b.

Next, an embodiment of molding the rubber roller in the present embodiment will be described.
FIG. 6 shows a schematic configuration of a rubber roller manufacturing apparatus used for molding the rubber roller of the present embodiment.
In FIG. 6, 21 is a heating platen, 21b is a lower heating platen, 22 is a die holder, 22b is a die holding cylinder, 23 is an injection nozzle, 25 is an injection syringe, 25b is a servo motor, 26 is a nozzle raising cylinder, 27 is a material pump.

In the present embodiment, when injecting the thermosetting liquid rubber material, the injection syringe 25 is used for injection of the material, and the injection syringe 25 is driven by the servo motor 25b, and the torque becomes higher than the set torque by the torque control method. At this time, the injection of the liquid rubber material can be stopped.
Further, when the rubber material is injected using the injection syringe 25, the injection syringe may be driven by a hydraulic cylinder to inject the material at a constant oil pressure. At that time, the set torque in the torque control method or the set torque in the hydraulic cylinder is set to a torque smaller than the torque required for the rubber material to reach the axial groove 1c, thereby generating a rubber burr. Can be suppressed.
That is, by setting the torque as small as described above, the rubber material can be controlled to reach the axial groove 1c, and thereby the circumferential groove 1b and the axial groove 1c. It is possible to suppress the occurrence of rubber burrs.

  According to the above-described embodiment, when the rubber roller is taken out from the molding die, the rubber burrs made of the rubber material overflowing in the circumferential groove 1b and the axial groove 1c are integrated with the rubber roller to form the molding die. It can be discharged to the outside. This makes it possible to easily remove the rubber burr.

Examples in which the rubber roller manufacturing method of the present invention is applied to an electrophotographic developing rubber roller manufacturing method will be described below.
In this embodiment, the same structure as that of the present embodiment is used as the basic structure of the molding die for the rubber roller, except that the non-injection piece 1 having the structure shown in FIG. 3 is used. It was.
Also, the rubber roller manufacturing apparatus having the same configuration as that used in the present embodiment shown in FIG. 6 was used.
In the present embodiment, a pipe mold body 2 having a cylindrical shape with an outer diameter of φ25 mm, an inner shape of φ12 mm, and a length of 250 mm was used.
Further, as the non-injection side piece 1 and the injection side piece 3 fitted to both ends of the pipe mold body 2, those having an outer diameter of φ25 mm were used.
At that time, when the liquid rubber material was injected, a molding die having a lid-shaped nozzle touch piece for pressing the injection nozzle 23 shown in FIG. 6 was used.
In addition, the molding die is made of pre-hardened steel, and the injection piece 3 has eight holes with a pitch circle diameter of 11 mm and a diameter of φ1.8 mm as a gate hole for material injection. The ones that were used were used.

In the present embodiment, the tapered fitting portion of the non-injection piece has a tip diameter of 12 mm, and the inclination angle θ1 of the tapered fitting portion 1a is 12 °.
Further, the tapered fitting portion 1a is provided with a circumferential groove 1b for escaping the variation in the injection amount and an axial groove 1c for guiding the overflow material into the circumferential groove.
At that time, the circumferential groove 1b in the present embodiment has an outer diameter of φ13, and an angle θ2 formed between the bottom of the circumferential groove 1b and the central axis in the longitudinal direction of the pipe mold body is 0 °.
Moreover, the groove | channel was formed to the position of 5 mm from the front-end | tip of a taper-shaped fitting part.
The axial groove for guiding the overflow material to the circumferential groove has a width of 2 mm and a depth of 0.25 at the tip of the tapered fitting portion, and the base of the axial groove and the center of the non-injection piece 1 The angle formed with the shaft was 0 °, and four were provided with a uniform distribution around the circumference.
Further, as an air vent communicating with the outside of the mold from the circumferential groove, the outer periphery of the tapered fitting portion of the piece 1 on the non-injection side was cut at 0.05 mm in four locations in the axial direction.

For forming the developing roller, a rubber roller shaft 4 (made of free-cutting steel SUM23L) having an outer diameter of 6 mm and a length of 270 mm is arranged inside the mold, and a thermosetting liquid silicone rubber material is formed in a 22.5 cc mold. The injection was injected.
The injection speed at this time was 5 cc / sec.
As the liquid silicone rubber material for molding, a two-component mixed thermosetting silicone rubber having a viscosity of 150 Pa · s was used.
Moreover, in order to give electroconductivity, what mix | blended carbon black was used. After injection of the liquid silicone rubber material, the molding die was put into a heating hot plate 21 at 110 ° C. for 5 minutes to cure the rubber material, and after cooling to 30 ° C., the rubber roller was taken out from the molding die.
Also, when injecting and curing the liquid silicone rubber material, molding is performed by pressing the mold from above with the mold pressing cylinder 22b so that the pipe mold and both end pieces do not float due to the material injection pressure or thermal expansion. did. The load at this time was about 750N.
Further, both end surfaces of the molded rubber roller were cut off at predetermined positions, and thereafter, a urethane paint in which a carbon black conductive material was dispersed was dip coated on the surface of the rubber roller to obtain a developing roller.

Comparative example

Next, a method for producing the electrophotographic developing rubber roller of Comparative Example 1 and Comparative Example 2 will be described.
In FIG. 4, the schematic structure of the whole metal mold | die used for the manufacturing method of the rubber roller of the comparative example 1 and the comparative example 2 is shown.
FIG. 5 is a view for explaining the structure of the non-injection piece of the mold used in Comparative Example 1 and Comparative Example 2.
FIG. 5A is a perspective view of the non-injection side piece, and FIG. 5B is a YY sectional view of the non-injection side piece.
In FIG. 4, 11 is a non-injection side piece, 11a is an overflow hole formed in the non-injection side piece, and 11b is a recess liquid reservoir formed in the end surface of the non-injection side piece.
In the configuration of the comparative example shown in FIG. 4, the configuration other than the non-injection side piece 11 is the same as that of the molding die for the rubber roller of the first embodiment.
That is, the pipe mold body 2, the injection piece 3 and the rubber roller shaft 4 have the same configuration as that of the first embodiment.

[Comparative Example 1]
In Comparative Example 1, the same mold as the rubber roller molding mold of Example 1 was used except for the non-injection side piece 11 shown in FIGS. 4 and 5 described above.
At this time, as the non-injection side piece, the following was used: an overflow hole 11a formed on the non-injection side and a concave liquid reservoir 11b formed on the end surface of the non-injection side.
That is, the non-injection side piece 11 has a cavity side tip portion of φ1.5 length 1 mm for air bleeding and material overflow, and thereafter, a φ2 mm stepped hole 1 a is opened at four locations with equal circumferential distribution. Was used.
At that time, a non-injection-side piece 11 provided with a recess-shaped liquid reservoir 1c having an inner diameter φ18 and a depth of 2 mm was used.
The pipe mold 2 other than the non-injection side piece 11, the injection side piece 3, and the rubber roller shaft 4 were the same molds as in Example 1.
The material injection conditions were the same as in Example 1, and the material was injected into a 22.5 cc molding die at an injection rate of 5 cc / second.
In addition, the silicone rubber material and the curing conditions were all the same as in Example 1.

[Comparative Example 2]
As Comparative Example 2, the same mold as Comparative Example 1 was used, and the material injection conditions were injected into a 23.5 cc molding mold at an injection rate of 5 cc / sec.
In addition, the silicone rubber material and the curing conditions were all the same as in Example 1.

When the developing roller was molded in the above Examples, Comparative Example 1 and Comparative Example 2, rubber burrs in the overflow portion of the non-injection piece were observed.
In the example, the rubber material overflowing from the mold cavity was cured in the circumferential groove 1b and the axial groove 1c provided in the piece 1 on the non-injection side, and remained connected to the end face of the rubber roller.
That is, when the non-injection piece 1 and the injection piece 3 are removed from the pipe mold body 2, the rubber burrs in the circumferential groove 1b and the axial groove 1c are the end faces of the rubber roller which is a molded product. Remained connected.
Further, when the rubber roller was protruded from the injection side and taken out of the mold, the rubber burr was discharged out of the mold while being connected to the end surface of the rubber roller of the molded product.
Further, the rubber burrs in the overflow portion were cut from the end surface of the rubber roller, and the weight was measured, and it was about 0.5 g.

On the other hand, in Comparative Example 1, the overflow rubber stopped in the middle of the overflow hole 11a of the non-injection piece 11 and remained in the overflow hole and clogged.
That is, when the non-injection side piece 11 was removed, the rubber burrs in the overflow portion were cut off at the cavity side end face of the non-injection side piece, and remained in the overflow hole and clogged.
When this clogged rubber burr was removed and the weight was measured, it was about 0.5 g as in the example.

Further, in Comparative Example 2, the overflow rubber passed through the overflow hole 11a and reached the recess-shaped liquid reservoir portion 11b provided on the outer end surface of the non-injection piece 11.
When the non-injection side piece 11 was removed after hardening and cooling, the rubber burr in the overflow part was cut off at the cavity side end face of the non-injection side piece 11 but could be discharged from the non-injection side piece 11. .
That is, the rubber burrs could be discharged from the non-injection side piece 11 together with the rubber burrs of the recess-shaped liquid reservoir portion 11b formed on the outer end surface of the non-injection side piece 11.
However, depending on conditions such as the mold being inferior in dirt releasability, rubber burrs may be cut off between the overflow hole 11a and the recess liquid reservoir 11b, and rubber burrs may remain in the overflow hole 11a.
This frequency was about 2 to 5%. Further, when the weight of the rubber burr was measured, it was about 1.5 g, which was considerably larger than those of Examples and Comparative Example 1.
Table 1 summarizes the results of the above examples and Comparative Examples 1 and 2.

The figure which shows schematic structure of the whole shaping die used for manufacture of the rubber roller of embodiment of this invention and an Example. The figure explaining the structure of the piece on the non-injection side of the metal mold | die used in embodiment of this invention. (A) is a front view of the piece on the non-injection side, (b) is a side view of the piece on the non-injection side, and (c) is a cross-sectional view along XX. The figure explaining the structure of the piece on the non-injection side of the metal mold | die used in the Example of this invention. (A) is a front view of the piece on the non-injection side, (b) is a side view of the piece on the non-injection side, and (c) is a cross-sectional view along XX. The figure which shows schematic structure of the whole shaping die used for manufacture of the rubber roller of the comparative example 1 and the comparative example 2. FIG. The figure explaining the structure of the piece on the non-injection side of the metal mold | die used by the comparative example 1 and the comparative example 2. FIG. (A) is a perspective view of the non-injection side piece, (b) is a YY sectional view of the non-injection side piece. The figure which shows schematic structure of the manufacturing apparatus of the rubber roller used for shaping | molding of the rubber roller of embodiment and each Example of this invention.

Explanation of symbols

1: Non-injection side piece 1a: Tapered fitting portion 1b in non-injection side piece: Circumferential groove 1c: Axial groove 1d: Air vent groove 2: Pipe mold body 3: Injection side No. 4: Rubber roller shaft 11: Non-injection side piece 11a used in Comparative Examples 1 and 2: Overflow hole 11b formed in the non-injection side piece: Concave portion formed in the end surface of the non-injection side piece Liquid pool 21: Heating plate 21b: Lower heating plate 22: Mold presser 22b: Mold presser cylinder 23: Injection nozzle 25: Injection syringe 25b: Injection motor 26: Nozzle raising cylinder 27: Material pump

Claims (9)

A cylindrical mold with both ends open;
A first piece type mated with one of the openings at both ends and a second piece type mated with the other;
A shaft that is arranged in the cylindrical mold and can be held by a holding portion formed in the first piece type and the second piece type;
A rubber roller for injecting a rubber material into the cylindrical mold from the side of either the first piece type or the second piece type, and molding a rubber roller on the outer periphery of the shaft body Mold,
The piece of the first piece type or the second piece type on the side where the rubber material is not injected is in relation to the central axis in the longitudinal direction of the cylindrical die that fits into the opening of the cylindrical die. Having a tapered fitting portion with an inclination angle θ1;
A circumferential groove serving as a liquid reservoir for releasing variation in the amount of material injected into the tapered fitting portion, and a longitudinal direction of a cylindrical mold for guiding the overflowed material to the circumferential groove A molding die for a rubber roller, wherein one or more grooves are provided. In the mating portion where the tapered fitting portion in the piece shape mates with the cylindrical mold,
An air vent groove communicating with the outside from the circumferential groove is formed in either the tapered fitting portion in the piece shape or the mating portion on the cylindrical mold side. The molding die for a rubber roller according to claim 1, wherein   The circumferential groove has an angle θ2 formed by the bottom of the circumferential groove and a central axis in the longitudinal direction of the cylindrical mold of 0 ° or more, and the formed angle θ2 is a taper in the piece shape. 3. The molding die for a rubber roller according to claim 1, wherein the angle is smaller than an inclination angle [theta] 1 of the fitting portion having a shape.   The one or more grooves in the longitudinal direction of the cylindrical mold have an angle θ3 formed by the bottom of the groove and the central axis in the longitudinal direction of the cylindrical mold being 0 ° or more. The molding die of the rubber roller of any one of -3. A cylindrical mold having both ends opened, a first piece mold mating with one of the openings at both ends, a second piece mold mating with the other, and the first mold disposed in the cylindrical mold Using a molding die of a rubber roller having a shaft body that can be held by a holding portion formed in a piece shape and a second piece shape,
A rubber roller manufacturing method in which a rubber material is injected into the cylindrical mold from the side of either the first piece mold or the second piece mold, and a rubber roller is molded on the outer periphery of the shaft body. And
A rubber roller manufacturing method using the rubber roller molding die according to any one of claims 1 to 4 as the rubber roller molding die. When injecting the rubber material, an injection syringe is used to inject the rubber material, the injection syringe is driven by a motor,
6. The method of manufacturing a rubber roller according to claim 5, further comprising a step of controlling injection of the rubber material based on a control torque set in the motor.   The control torque set for the motor is set to a torque smaller than the torque required to reach one or more grooves in the longitudinal direction of the cylindrical mold. The manufacturing method of the rubber roller as described in any one of. When injecting the rubber material, an injection syringe is used to inject the rubber material, and the injection syringe is driven by a hydraulic cylinder,
6. The method of manufacturing a rubber roller according to claim 5, further comprising a step of controlling injection of the rubber material based on an oil pressure set in the hydraulic cylinder.   The oil pressure set in the hydraulic cylinder is set to be smaller than the oil pressure required when reaching one or more grooves in the longitudinal direction of the cylindrical mold. 9. A method for producing a rubber roller according to 8.

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