Tire Vulcanization Bladder and Pneumatic Tire Manufacturing Method
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United States of America Patent
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Issued Date -
Jul 28, 2016
app pub date -
Nov 11, 2013
filing date -
Nov 12, 2012
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Abstract
A tire vulcanization bladder where a thickness of a bladder main body portion is set to a constant thickness. At least one of multiple circular ribs, helical ribs in which multiple circumferential ribs are connected in a helix, multiple circular grooves, or helical grooves in which multiple circumferential grooves are connected in a helix is formed on the inner surface of the bladder at the portions corresponding to the tread portion, the shoulder portions, and the bead portions of the tire. When the bladder is inserted into a green tire that is set in the horizontal state within a mold and expanded, the expansion state of the bladder is regulated to press against the green tire in accordance with the inner surface shape of the tread portion the shoulder portions, and the bead portions.
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