Method for producing rubber member

Patent metadata

Field	Value
Publication number	US-11097447-B2
Application number	US-201716073407-A
Country	US
Kind code	B2
Filing date	Jan 12, 2017
Priority date	Feb 5, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Sumitomo Rubber Ind

Inventors

• Tanaka Tomoo
• Sakamoto Masayuki
• Taguchi Takafumi
• Okubo Sakae
• Konishi Takuma

Classifications

• B29C48/687 Primary

  having projections with a short length in the barrel direction, e.g. pins · CPC title

• B29B7/86

  for working at sub- or superatmospheric pressure {(B01F33/70 takes precedence)} · CPC title

• B29B7/845

  Venting, degassing or removing evaporated components in devices with rotary stirrers · CPC title

• B29B7/84 Primary

  Venting or degassing {; Removing liquids, e.g. by evaporating components} · CPC title

• B29B7/422

  with screw sections co-operating, e.g. intermeshing, with elements on the wall of the surrounding casing · CPC title