Method for producing rubber member
A method for producing a rubber member according to the present invention includes the steps of: supplying a rubber composition to a cylinder provided in an extruder; extruding the rubber composition to a downstream side of the cylinder while kneading the rubber composition in an internal space of the cylinder that includes a plurality of protruding members protruding from an inner wall surface of the cylinder; compressing the rubber composition at least once in the step of extruding the rubber composition to the downstream side; discharging a gas generated from the compressed rubber composition to outside of the cylinder; discharging, through a discharge outlet of the cylinder, the rubber composition after the gas has been generated; and molding the rubber composition that has been discharged through the discharge outlet into a predetermined rubber member shape.
1. A method for producing a rubber member, the method comprising the steps of:
supplying a rubber composition to a cylinder provided in an extruder;
extruding the rubber composition to a downstream side of the cylinder by a screw at a rotation speed of 30 rpm or higher while kneading the rubber composition in an internal space of the cylinder that includes a plurality of protruding members protruding from an inner wall surface of the cylinder;
compressing the rubber composition at least once in the step of extruding the rubber composition to the downstream side;
discharging a gas generated from the compressed rubber composition to outside of the cylinder;
discharging, through a discharge outlet of the cylinder, the rubber composition at 135° C. or less after the gas has been generated; and
molding the rubber composition that has been discharged through the discharge outlet into a tire tread shape.
2. The method for producing a rubber member according to claim 1 ,
wherein the rubber composition is caused to pass through a plurality of slits in the step of compressing the rubber composition.
3. The method for producing a rubber member according to claim 1 ,
wherein the rubber composition contains silica in an amount of 40 PHR or more relative to 100 PHR of polymer.
4. The method for producing a rubber member according to claim 1 ,
wherein the gas generated from the rubber composition is drawn to the outside of the cylinder by a vacuum pump.
5. The method for producing a rubber member according to claim 2 ,
wherein the rubber composition contains silica in an amount of 40 PHR or more relative to 100 PHR of polymer.
6. The method for producing a rubber member according to claim 2 ,
wherein the gas generated from the rubber composition is drawn to the outside of the cylinder by a vacuum pump.
7. The method for producing a rubber member according to claim 3 ,
wherein the gas generated from the rubber composition is drawn to the outside of the cylinder by a vacuum pump.