METHOD FOR MANUFACTURING PNEUMATIC TIRE

• US 20100032078A1
• Filed: 05/05/2009
• Published: 02/11/2010
• Est. Priority Date: 08/11/2008
• Status: Abandoned Application

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: MIYAZAKI, Tatsuya
• Application Number:
  US12/435,759
• Publication Number:
  US 20100032078A1
• Time in Patent Office: Days
• US Class Current: 156/110.100
• CPC Class Codes: B29C 35/0288 Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process controlling or regulating chemical, physical or physico- chemical processes in general B01J19/0006
• CPC Class Codes: B29D 2030/0675 Controlling the vulcanization processes
• CPC Class Codes: B29L 2030/00 Pneumatic or solid tyres or parts thereof conveyor belts B29L2031/7092; drive belts B29L2031/7094; fourdrinier belts B29L2031/733
• CPC Class Codes: Y02T 10/86 Optimisation of rolling resistance, e.g. weight reduction

Abstract

A method for manufacturing a pneumatic tire capable of improving the rolling resistance is disclosed. The green tire put in a mold is vulcanized together with the belt cord topping rubber by heating the green tire from the inside of the tire with a high-temperature heating medium and from the outside of the tire with the mold heated. The topping rubber comprises 25 to 55 parts by mass of carbon black and/or silica, and sulfur. The base rubber comprises 10 to 45 mass % of modified butadiene rubber and/or modified styrene butadiene rubber with respect to 100 mass % of the base rubber. The maximum temperature of the topping rubber in a cord near region within 3 mm distance from the surfaces of the belt cords is limited within a range of from 140 to 165 deg.C. The temperature of the mold is set within a range of from 140 to 165 deg.C.

Claims

1. A method for manufacturing a pneumatic tire comprising the steps of:

preparing a green tire provided in a tread portion with a belt composed of steel cords embedded in a unvulcanized topping rubber;

putting the green tire in a mold; and

vulcanizing the green tire together with the unvulcanized topping rubber by heating the green tire from the inside of the tire with a high-temperature heating medium and from the outside of the tire with the mold heated, wherein

the unvulcanized topping rubber comprises 100 parts by mass of base rubber, 25 to 55 parts by mass of carbon black and/or silica, and sulfur;

the base rubber comprises 10 to 45 mass % of modified butadiene rubber and/or modified styrene butadiene rubber with respect to 100 mass % of the base rubber; and

in the step of vulcanizing the green tire, the maximum temperature of the topping rubber in a cord near region within 3 mm distance from the surfaces of the belt cords is in a range of from 140 to 165 deg.C.

2. The method for manufacturing a tire according to claim 1, wherein,

in the step of vulcanizing the green tire, the temperature of the mold is set within a range of from 140 to 165 deg.C, and

the step of vulcanizing the green tire comprises controlling the supplying time of the heating medium to the inside of the tire so that the maximum temperature in the cord near region is limited within the above-mentioned range of from 140 to 165 deg.C.

3. The method for manufacturing a tire according to claim 1, wherein

the topping rubber comprises 5 to 55 parts by mass of silica with respect to 100 parts by mass of the base rubber.

4. The method for manufacturing a tire according to claim 1, wherein

the topping rubber comprises 0.5 to 3.0 parts by mass of at least one compound selected from resorcin, resorcinol condensate, modified resorcinol condensate, cresol resin, and modified cresol resin with respect to 100 parts by mass of the base rubber.

5. The method for manufacturing a tire according to claim 1, wherein

the topping rubber comprises 5 to 55 parts by mass of silica, and

0.5 to 3.0 parts by mass of at least one compound selected from resorcin, resorcinol condensate, modified resorcinol condensate, cresol resin, and modified cresol resin

with respect to 100 parts by mass of the base rubber.

6. The method for manufacturing a tire according to claim 2, wherein

the topping rubber comprises 5 to 55 parts by mass of silica with respect to 100 parts by mass of the base rubber.

7. The method for manufacturing a tire according to claim 2, wherein

the topping rubber comprises 0.5 to 3.0 parts by mass of at least one compound selected from resorcin, resorcinol condensate, modified resorcinol condensate, cresol resin, and modified cresol resin with respect to 100 parts by mass of the base rubber.

8. The method for manufacturing a tire according to claim 2, wherein

the topping rubber comprises 5 to 55 parts by mass of silica, and

to 3.0 parts by mass of at least one compound selected from resorcin, resorcinol condensate, modified resorcinol condensate, cresol resin, and modified cresol resin

with respect to 100 parts by mass of the base rubber.