Internal pressure container and its manufacturing method

Abstract

To provide a fiber reinforced resin sleeve that is superior in mechanical strength in low cost and easily without enlarging the sleeve and increasing the weight of the sleeve, a method for manufacturing an internal pressure container in which both end portions of a fiber reinforced resin sleeveformed by continuously winding a fiber in a filament winding method with both ends having larger diameters are closed by closure lids, and the closure lidsare supported by retainer ringscoupled to the sleeve, comprising the following steps of: continuously winding the fiber, impregnated with the resin, on a mandrel substantially in a perpendicular direction to an axial direction of the mandrel to form a first layer F; setting the first layer F so that a distal end is located in a position at a predetermined position L from an end of the sleeveand a proximal end is located in a position inside of the closure lidand the retainer ring; subsequently continuously winding the fiber on the first layer F at an acute angle to the axial direction of the mandrel to form a second layer S over an entire range of the sleeve; subsequently continuously winding the fiber on the second layer S substantially in the perpendicular direction to the axial direction of the mandrel to form a third layer T wound only on the end portion of the sleeve; and after curing the resin, providing the closure lidand the retainer ringto the sleeveformed by removing the mandrel away.