JP2002248668A - Apparatus and method for manufacturing rubber roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method for manufacturing a rubber roller without stretching an unvulcanized rubber roller in a string-like state when the unvulcanized roller is separated at each one by cutting an unvulcanized rubber composition and without damaging a mandrel at the unvulcanized composition cutting time. SOLUTION: The apparatus for manufacturing the rubber roller executes the steps of extruding the unvulcanized rubber composition by using an extruder, simultaneously continuously passing the mandrel through a cross head die of the extruder, disposing the unvulcanized composition on the outer periphery of the mandrel, and then cutting the unvulcanized composition near the end of the mandrel by a cutting blade. The apparatus further executes the step of heating by the cutter at 70 deg.C. The method for manufacturing the rubber roller in the apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber roller manufacturing apparatus and a rubber roller manufacturing method, and more particularly, to extruding an unvulcanized rubber composition using an extruder and simultaneously extruding a core metal. After passing the unvulcanized rubber composition on the outer periphery of the core metal by passing through the crosshead die of the machine, the rubber roller for cutting the unvulcanized rubber composition near the end of the core metal with a cutting blade is used. The present invention relates to a manufacturing apparatus and a method for manufacturing a rubber roller.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a rubber roller, an unvulcanized rubber composition is extruded into a tube using an extruder, cut into a prescribed size, and then heated to produce a vulcanized rubber tube. There is known a method of manufacturing a rubber roller in which a core metal coated with an adhesive is inserted into an inner diameter portion of a vulcanized rubber tube and further heated to bond the core metal to the vulcanized rubber.

[0003] Further, simultaneously with extruding an unvulcanized rubber composition using an extruder, a core metal continuously coated with an adhesive is passed through a crosshead die of the extruder so that the outer periphery of the core metal is After the unvulcanized rubber material is placed on the core, the unvulcanized rubber composition in the vicinity of the end of the core is cut with a cutting blade for each core, and then heated to vulcanize. Is also known.

[0004] However, the conventional manufacturing method described above has the following disadvantages.

That is, an unvulcanized rubber composition is extruded into a tube using an extruder, cut into a prescribed size,
A method of manufacturing a rubber roller that produces a vulcanized rubber tube by heating, inserts a core metal coated with an adhesive into the inner diameter portion of the vulcanized rubber tube, and then further heats to bond the core metal and the vulcanized rubber is provided. In addition, there is a problem that the number of manufacturing steps is large and the manufacturing cost is high.

On the other hand, simultaneously with extruding an unvulcanized rubber composition using an extruder, a core metal continuously coated with an adhesive is passed through a crosshead die of the extruder, so that the outer periphery of the core metal is After the unvulcanized rubber material is placed on the core, the unvulcanized rubber composition in the vicinity of the end of the core is cut with a cutting blade for each core, and then heated to vulcanize. Has the advantage that the manufacturing process can be shortened because the core metal insertion step and the heat bonding step are omitted, but the cutting of the unvulcanized rubber composition is performed because the cutting of the unvulcanized rubber composition is performed on the core metal. Can not be completed completely, and when unvulcanized rubber rollers are cut off one by one, the unvulcanized rubber is stretched into a thread and adheres to the device, causing device trouble or causing device contamination. There was a problem. In addition, if the cutting blade is strongly pressed against the metal core so that the unvulcanized rubber composition can be cut, the core metal is damaged and the rubber roller becomes defective or the cutting blade is easily damaged. there were.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide an unvulcanized rubber composition that is not stretched into a thread when cutting an unvulcanized rubber composition and separating the unvulcanized rubber rollers one by one. Another object of the present invention is to provide a rubber roller manufacturing apparatus and a rubber roller manufacturing method that do not damage a core metal when cutting an unvulcanized rubber composition.

[0008]

According to the present invention, an unvulcanized rubber composition is extruded using an extruder, and at the same time, a metal core is continuously passed through a crosshead die of the extruder.
After placing the unvulcanized rubber composition on the outer periphery of the core,
A rubber roller manufacturing apparatus for cutting an unvulcanized rubber composition near an end of a core metal with a cutting blade, wherein the cutting blade is heated to 70 ° C. or higher, and a rubber roller manufacturing apparatus. A method is provided.

[0009]

Embodiments of the present invention will be described below in detail.

[0010] The rubber roller manufacturing apparatus and the rubber roller manufacturing method according to the present invention extrude an unvulcanized rubber composition using an extruder, and simultaneously extrude a core metal coated with an adhesive. After passing an unvulcanized rubber composition on the outer periphery of the core metal by passing through a crosshead die, the unvulcanized rubber composition near the end of the core metal is cut by a cutting blade for each core metal. In a manufacturing apparatus for a rubber roller to be cut, the cutting blade is
The unvulcanized rubber composition is cut by heating to 0 ° C. or higher. Preferably, the temperature of the cutting blade to be heated is 100 to 300 ° C. at least when cutting the unvulcanized rubber composition.

According to the rubber roller manufacturing apparatus and the rubber roller manufacturing method of the present invention having the above-described configuration, the unvulcanized rubber composition is cut by using a heated cutting blade for each core metal so that the unvulcanized rubber can be formed. Unvulcanized rubber rollers can be cut off one by one without being stretched into a thread. This is presumably because even if the cutting of the unvulcanized rubber composition by the cutting blade is not complete, the unvulcanized rubber is cut by heat when it starts to be stretched. Cutting blade temperature is 70
If the temperature is lower than ℃, there is no effect of improving cutting performance. Further, even when the temperature of the cutting blade is 70 ° C. or higher and lower than 100 ° C., the effect of improving the cutability is small, although it is at a practical level.
If a small amount of rubber adheres to the cutting blade for a long time
May burn. The heating method is not particularly limited, but heating can be performed by an electric heater, high-frequency induction heating, or the like.

In addition, two or more cutting blades are installed,
There is a mechanism for opening and closing at least two cutting blades, and when the two or more cutting blades are in a closed state, it is preferable to set so that a circular cavity having a diameter substantially equal to the outer diameter of the cored bar is generated. ,
By closing the two or more cutting blades from the open state, the unvulcanized rubber on the outer periphery of the cored bar can be easily cut. Further, the shape of the cutting blade preferably comprises a semicircular portion corresponding to the cored bar and a meshing portion larger than the outer diameter of the rubber roller, whereby the unvulcanized rubber can be easily cut.

The material of the cutting blade is preferably softer than the hardness of the cored bar. If the material of the cutting blade is harder than the hardness of the core metal, the core metal will be easily damaged if the cutting blade comes into strong contact with the core metal when cutting the unvulcanized rubber on the outer periphery of the core metal, and the rubber roller is defective. Becomes higher. The core is generally made of SUM (sulfur composite free-cutting steel) plated with KN, etc. In order to prevent damage to the core, brass or duralumin is used as the material of the cutting blade. Is preferably used. In the present invention, Vickers hardness (Hv) is used as the hardness evaluation. However, universal hardness, Rockwell hardness and the like can be evaluated in the same manner.

Further, when cutting the unvulcanized rubber composition, it is preferable to rotate the angle by 10 ° or more with the two or more cutting blades closed. By rotating the cutting blade, the cutting accuracy of the unvulcanized rubber composition on the outer periphery of the cored bar is further improved.

[0015]

The present invention will be described below in more detail with reference to specific examples and comparative examples.

Example 1 An unvulcanized rubber composition was extruded using an extruder equipped with a crosshead die together with a core metal to which an adhesive was previously applied so that the outer diameter was approximately 10 mm. The vulcanized rubber composition was coated. At this time, the core was made of SUM (sulfur composite free-cutting steel material with an outer diameter of 6 mm, hardness =
180Hv) KN plated material (hardness = 45)
0Hv), the feeding was continued at a constant speed according to the rubber extrusion speed so that no gap was opened between the metal cores. Next, a pair of cutting blades (A) shown in FIG. 1 made of brass (hardness = 150 Hv) is used as the material, and the unvulcanized rubber composition near the end of the core is opened from the state where the cutting blade is opened. Disconnect by closing,
An unvulcanized rubber roller was obtained by separating. At this time, the temperature of the cutting blade at the time of cutting was set using an electric heater so as to be 120 ° C., and the closing pressure of the cutting blade was set at 0.2 Mpa.

(Example 2) The temperature of the cutting blade at the time of cutting was set to 250 ° C with respect to Example 1, except that
An unvulcanized rubber roller was produced in the same manner as in Example 1.

(Example 3) An unvulcanized rubber roller was produced in the same manner as in Example 1 except that the temperature of the cutting blade was set to 80 ° C during cutting.

(Example 4) In comparison with Example 1, the shape of the cutting blade was set such that the temperature of the cutting blade at the time of cutting the two-piece set of cutting blades (B) shown in FIG. Except for the above, an unvulcanized rubber roller was produced in the same manner as in Example 1.

Example 5 An unvulcanized rubber roller was produced in the same manner as in Example 4 except that the material of the cutting blade was changed to duralumin (hardness = 150 Hv).

(Example 6) An unvulcanized rubber roller was produced in the same manner as in Example 5, except that the cutting blade was rotated by 180 ° with the cutting blade closed during cutting.

(Example 7) An unvulcanized rubber roller was prepared in the same manner as in Example 1 except that the shape of the cutting blade was changed to a pair of cutting blades (C) shown in FIG. Was prepared.

Example 8 An unvulcanized rubber roller was prepared in the same manner as in Example 1 except that the shape of the cutting blade was changed to a set of four cutting blades (D) shown in FIG. Was prepared.

Comparative Example 1 Compared to Example 1, the temperature of the heating blade was kept at room temperature (25 ° C.) without heating the cutting blade during cutting.
C), an unvulcanized rubber roller was produced in the same manner as in Example 1.

Comparative Example 2 An unvulcanized rubber roller was manufactured in the same manner as in Example 1 except that the temperature of the cutting blade was set to 60 ° C. in cutting.

Comparative Example 3 An unvulcanized rubber roller was produced in the same manner as in Example 4 except that the temperature of the heating blade was changed to room temperature without heating the cutting blade during cutting. did.

Comparative Example 4 An unvulcanized rubber roller was produced in the same manner as in Comparative Example 1 except that the material of the cutting blade was SUS303 (hardness = 200 Hv).

Comparative Example 5 An unvulcanized rubber roller was produced in the same manner as in Comparative Example 3, except that the material of the cutting blade was SUS303.

Comparative Example 6 An unvulcanized rubber roller was produced in the same manner as in Comparative Example 4, except that the closing pressure of the cutting blade was set to 0.4 MPa.

Comparative Example 7 An unvulcanized rubber roller was produced in the same manner as in Comparative Example 6, except that the cutting blade was rotated by 180 ° with the cutting blade closed during cutting.

The evaluation of the examples and comparative examples was performed as follows by preparing 100 unvulcanized rubber rollers of each example and comparative example.

<Cutting Condition> The unvulcanized rubber composition near the end of the core was cut with a cutting blade, and the condition when the unvulcanized rubber rollers were cut off one by one was observed. Good if the unvulcanized rubber is completely cut and will not be stretched at all when it is cut off, good if it can be stretched a little when it is cut off but will not contaminate the device without being greatly stretched. Those that are greatly stretched in a thread and contaminate the device are not allowed.

<Core metal flaw> The unvulcanized rubber composition near the end of the core metal is cut with a cutting blade, and the unvulcanized rubber rollers are cut off one by one. The presence or absence was observed. One of the 100 unvulcanized rubber rollers was one in which the core metal was not damaged.
20 to 20 cores with scratches were rated as Δ, and 100 or more unvulcanized rubber rollers with 21 or more cores damaged were rated as x.

The results are shown in Tables 1 and 2. From this result, it can be seen that heating the cutting blade to 70 ° C. or higher improves the cutting properties of the unvulcanized rubber. In addition, in order to improve the cutting performance, the cutting blade is hardened more than necessary without heating the cutting blade, and when the cutting blade is pressed more strongly than necessary on the core metal, the core metal is found to be damaged. .

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

As described above, according to the present invention,
It has become possible to provide a rubber roller manufacturing apparatus and a rubber roller manufacturing method which are excellent in the cutability of unvulcanized rubber and do not damage the core metal.

[Brief description of the drawings]

FIG. 1 shows a pair of cutting blades (A) in a rubber roller manufacturing apparatus of the present invention.

FIG. 2 is a pair of cutting blades (B) in the rubber roller manufacturing apparatus of the present invention.

FIG. 3 is a pair of cutting blades (C) in the rubber roller manufacturing apparatus of the present invention.

FIG. 4 is a set of four cutting blades (D) in the rubber roller manufacturing apparatus of the present invention.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Mie Takahashi 1888-2, Kusazaki-cho, Kashizaki-cho, Inashiki-gun, Ibaraki Pref. F-term (reference) in Canon Chemicals Co., Ltd.

Claims (14)

[Claims] 1. Extruding an unvulcanized rubber composition using an extruder, and simultaneously passing a core metal through a crosshead die of the extruder to form an unvulcanized rubber composition on the outer periphery of the core metal. After placing the rubber composition, in a rubber roller manufacturing apparatus that cuts the unvulcanized rubber composition near the end of the core metal with a cutting blade,
An apparatus for manufacturing a rubber roller, wherein the cutting blade is heated to 70 ° C. or higher. 2. The rubber roller manufacturing apparatus according to claim 1, wherein the temperature of the cutting blade is at least 100 to 300 ° C. when cutting the unvulcanized rubber composition. And a mechanism for opening and closing the two or more cutting blades, wherein when the two or more cutting blades are closed, the outer diameter of the cored bar is substantially equal to the outer diameter of the cored bar. The rubber roller according to claim 1 or 2, wherein a circular hollow portion having an equivalent diameter is set to be formed, and the unvulcanized rubber on the outer periphery of the core metal is cut by closing the two or more cutting blades. Manufacturing equipment. 4. The rubber roller manufacturing apparatus according to claim 1, wherein the shape of the cutting blade comprises a semicircular portion corresponding to the cored bar and an engaging portion having a larger diameter than the outer diameter of the rubber roller. 5. The rubber roller manufacturing apparatus according to claim 1, wherein the material of the cutting blade is softer than the hardness of the cored bar. 6. The rubber roller manufacturing apparatus according to claim 5, wherein the material of the cutting blade is brass or duralumin. 7. When cutting the unvulcanized rubber composition, the 2
The apparatus for manufacturing a rubber roller according to any one of claims 1 to 6, wherein the apparatus rotates at an angle of 10 ° or more with at least one cutting blade being closed. 8. An unvulcanized rubber composition is extruded using an extruder, and at the same time, the core metal is continuously passed through a crosshead die of the extruder to form an unvulcanized rubber composition on the outer periphery of the core metal. Disposing the rubber composition of the above, the method of manufacturing a rubber roller having a step of cutting the unvulcanized rubber composition near the end of the core metal with a cutting blade, wherein the cutting blade is heated to 70 ℃ or more. A method for manufacturing a rubber roller. 9. The method for producing a rubber roller according to claim 8, wherein the temperature of the cutting blade is at least 100 to 300 ° C. when cutting the unvulcanized rubber composition. 10. The apparatus according to claim 1, wherein two or more cutting blades are provided.
There is a mechanism to open and close more than one cutting blade, and when the two or more cutting blades are in a closed state, it is set so as to generate a circular cavity having a diameter substantially equal to the outer diameter of the cored bar, The method for producing a rubber roller according to claim 8 or 9, wherein the unvulcanized rubber on the outer periphery of the cored bar is cut by closing the two or more cutting blades. 11. The rubber roller manufacturing apparatus according to claim 8, wherein the shape of the cutting blade comprises a semicircular portion corresponding to the cored bar and a meshing portion having a larger diameter than the outer diameter of the rubber roller. 12. The method according to claim 8, wherein the material of the cutting blade is softer than the hardness of the cored bar. 13. The method according to claim 12, wherein the material of the cutting blade is brass or duralumin. 14. The method for producing a rubber roller according to claim 8, wherein at the time of cutting the unvulcanized rubber composition, the two or more cutting blades are rotated at an angle of 10 ° or more in a closed state.