Patent ID: 9233489
Filing Date: 2016-01-12
CPC Classification: B29C,B29K,F17C

Claim Text:
1. A manufacturing method of a high-pressure gas tank, comprising steps of: (a) providing a tank configured to have a fiber layer formed on outer surface of the tank vessel by winding reinforcement fibers impregnated with a thermosetting resin; and (b) performing a thermal curing process that heats the tank vessel to thermally cure the thermosetting resin and thereby form a fiber-reinforced resin layer, and performing a bubble removal process for preventing formation of air bubble in the fiber-reinforced resin layer, in each of multiple periods during which the thermal curing process is performed; wherein the bubble removal process includes at least one of three type processes that are a first type of process that changes the rotational speed of the tank vessel while the tank vessel is rotating, a second type of process that sprays a fluid toward the tank vessel, and a third type of process that applies an antifoam onto a surface of the fiber layer, and the bubble removal process includes performing the same type process, which is selected from the three type processes, in each of multiple discontinuous periods.