Method for manufacturing tank and manufacturing device thereof

A manufacturing device of a tank, the tank including:

• a hollow liner including a cylindrical straight body portion and a dome portion that narrows gradually in a direction opposite to the straight body portion from an end portion of the straight body portion in an axial direction;
• and a reinforcing layer formed on an outer surface of the liner by impregnating with resin a fiber layer including fibers wrapped in an overlapping manner in a radial direction,
• the manufacturing device comprising:
• a mold configured to house a preform including the fibers wrapped in an overlapping manner in a radial direction around the outer surface of the liner such that a first fiber layer on an outer surface of the dome portion is less dense than a second fiber layer on an outer surface of the straight body portion and such that a portion of a lamina of the first fiber layer, which is less dense, is interposed continuously from the first fiber layer partially between laminae of the second fiber layer, and to allow impregnation of the fiber layer including the first fiber layer and the second fiber layer with the resin,
• wherein the mold is provided with a plurality of runners defining gates through which the resin flows and that are open in the mold such that impregnation of the fiber layer with the resin is performed separately in an axial direction and a radial direction of the liner, and at least one of the plurality of runners is provided with an opening/closing mechanism.