Patent ID: 8906287
Filing Date: 2014-12-09
Classification: F17C,Y02E

Abstract:
1. A method of manufacturing a liner for gas tank that includes the liner and a fiber reinforced plastic layer, comprising: injecting resin from an injection gate into a cavity formed between an inner periphery of a main platen of a mold and an outer periphery of a core of the mold, which core is located inside the main platen; injecting pressurized inert gas through the gate while enlarging the cavity by pulling back a part of the core; and cooling down and hardening the resin while gas pressure is maintained for a specified time period, and then discharging the pressurized gas to collect the liner; wherein a plurality of hollow portions extend in an axial direction of the gas tank, following a shape of the tank, and are enclosed by a wall of the liner; wherein each of the plurality of hollow portions functions as a leak port that discharges leaked gas; and wherein a resin portion separates each of the plurality of hollow portions from the fiber reinforced plastic layer.