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一种充气轮胎、硫化轮胎的技术，应用在特殊轮胎、轮胎零部件、胎等方向
Inactive Publication Date: 2011-04-20
SUMITOMO RUBBER IND LTD
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Therefore, there arises a problem that when the vulcanized tire is released from the mold, the inner liner bonded to the bladder is carried away from the bladder side, causing an air-intake phenomenon between the inner liner and the insulation layer or the carcass
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Embodiment 1 to 6
[0090]
[0091] (manufacture of pneumatic tires)
[0092] According to each formula shown in Table 2, various compounding agents are loaded into a twin-screw extruder (screw diameter: φ50mm, L / D: 30, barrel temperature: 220° C.) and formed into granules, which are then used for implementation The unvulcanized polymer compositions of Examples 1 to 6 and Comparative Examples 1 to 10 were passed through a T-die extruder (screw diameter: φ80mm, L / D: 50, die width: 500mm, barrel temperature: 220°C, film Thickness: 0.3mm) production.
[0093] The resulting unvulcanized polymer composition is applied to the inner liner portion of the tire to manufacture a green tire. The green tire was pressure-molded in a mold at 170° C. for 20 minutes to obtain a vulcanized tire (195 / 65R15). Then, the vulcanized tire was cooled by introducing water for controlling the cooling temperature shown in Table 2 into the bladder. After the lapse of the cooling time shown in Table 2, the vulcanized tir...
Embodiment 7 to 12
[0128]
[0129] (production of vulcanized polymer sheets)
[0130] According to each formula shown in Table 4, various compounding agents are loaded into a twin-screw extruder (screw diameter: φ50mm, length: 1m, barrel temperature: 220°C) to form granules, and then extruded through a T die Machine (spiral diameter: φ80mm, control temperature: 220°C, film thickness: 0.6mm) to produce unvulcanized polymer sheets.
[0131] The resulting unvulcanized polymer sheet was heated at 170° C. for 2 minutes to produce a vulcanized polymer sheet. For vulcanized polymer sheets, an air permeability test was performed.
[0132] (air permeability test)
[0133] According to the American Society for Testing and Materials ASTM D 1434 75M, measure the air permeability of the vulcanized polymer sheet (×10 11 cm 3 cm / cm 2 ·s·cm·Hg). The less air infiltration, the better the airtightness.
[0134] (manufacture of pneumatic tires)
[0135] The resulting unvulcanized polymer sheet is applied...
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Abstract
An object of the present invention is to provide a method for producing a pneumatic tire, that does not cause an air-in phenomenon between an inner liner and an insulation or carcass by preventing adhesion of an inner liner to a bladder. The method for producing a pneumatic tire according to the present invention includes the following steps. A green tire using, as an inner liner, a polymer composition in which a polymer component contains 100 to 60% by mass of a styrene-isobutylene-styrene triblock copolymer and 0 to 40% by mass of a polyamide-based polymer that contains polyamide in the molecular chain and has a Shore D hardness of 70 or less is prepared. The green tire is mounted in a mold and vulcanized while being pressurized by a bladder. The resultant vulcanized tire is cooled at 10 to 120 DEG C. for 10 to 300 seconds.
Description
[0001] This application is based on Japanese Patent Application No. 2009-217034 filed with the Japan Patent Office on September 18, 2009, the entire contents of which are hereby incorporated by reference. technical field [0002] The present invention relates to a method of producing pneumatic tires. Background technique [0003] Recently, due to strong social demand for fuel-efficient automobiles, tire weight reduction has been attempted. In tire members, weight reduction of an inner liner, which is located inside a tire and has a function of improving air permeation resistance by reducing the amount of air leakage (air permeation amount) from the inside of the pneumatic tire to the outside, has also been attempted. [0004] In the rubber composition for an inner liner, the improvement of tire air penetration resistance is performed by using a butyl-based rubber comprising 70 to 100% by mass of butyl rubber and 30 to 0% by mass of natural rubber. In addition to butene, but...
Claims
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