High-pressure container and method of manufacturing high-pressure container

A method of manufacturing a high-pressure container in which a fiber layer is formed by winding reinforcing fibers around a liner including a cylindrical body portion and hemispherical closing portions that close one end and another end of the body portion respectively, the method comprising forming the fiber layer by repeating steps a plurality of times, the steps including:

• forming the reinforcing fibers by bundling a plurality of filaments;
• forming a hoop layer by winding the reinforcing fiber in a circumferential direction of the body portion of the liner;
• and
• forming a helical layer that reinforces the closing portions, by winding the reinforcing fiber in a direction inclined with respect to an axial direction of the liner while forming the reinforcing fiber by bundling the plurality of filaments,
• wherein the reinforcing fibers used for the hoop layer are formed in the forming of the reinforcing fibers by twisting the plurality of filaments so as to be inclined with respect to a fiber bundle direction of the reinforcing fibers at a predetermined twist angle formed between the fiber bundle direction and the filaments of the reinforcing fibers, and
• among the steps repeated a plurality of times in the forming of the fiber layer, a first step includes a first forming of the reinforcing fibers used for a first hoop layer to be located closest to the liner and a second step includes a second forming of the reinforcing fibers used for a second hoop layer to be located second closest to the liner, and the twist angle of the reinforcing fibers used for the first hoop layer is larger than the twist angle of the reinforcing fibers used for the second hoop layer, and the twist angle of the reinforcing fibers used for the first hoop layer and the twist angle of the reinforcing fibers used for the second hoop layer are acute angles.