Abstract: In a filament winding method, while a rotating tank relatively reciprocates in a tank axial direction to a helical winding head, fibers are fed from yarn-feeding sections to the tank. After the tank turns back in the tank axial direction, a large number of fibers are wound around one domed portion and a trunk portion of the tank, and trailing ends of the large number of fibers are located at one end portion of the trunk portion. Then a piece or a small number of fibers are fed from a rotating hoop winding head to the trunk portion, and hoop winding is performed on helical winding layers formed around the trunk portion. Then, at the one end portion of the trunk portion, the large number of fibers pulled from the yarn-feeding sections of the helical winding head are cut off.

Abstract: The present invention provides a technique for suppressing an occurrence of weld in a pressure vessel liner. A film gate for molding a pressure vessel liner is located on a radially outer side of an outer peripheral end portion of an meshing portion in the pressure vessel liner. By disposing the film gate on the radially outer side of the meshing portion with a sufficient space between, it is possible to control the flow rate of the molten resin during molding, thereby suppressing an occurrence of weld.

Abstract: There are disclosed a tank having a structure which achieves both a burst strength and a fatigue strength, and a manufacturing method of the tank. In order to realize this, in a tank comprising a liner, and an FRP layer including a hoop layer and a helical layer formed by winding fibers around the outer periphery of the liner, at least an innermost helical layer is formed as a smooth helical layer. When the smooth helical layer, i.e., a helical layer which does not have any unevenness or which has only little unevenness is formed, the unevenness can be prevented from being transferred to the hoop layer adjacent to the helical layer. When structural bends (undulations) of the fibers of the hoop layer are suppressed, a fatigue strength of the fibers themselves can be enhanced.

Abstract: In a filament winding method, while a rotating tank relatively reciprocates in a tank axial direction to a helical winding head, fibers are fed from yarn-feeding sections to the tank. After the tank turns back in the tank axial direction, a large number of fibers are wound around one domed portion and a trunk portion of the tank, and trailing ends of the large number of fibers are located at one end portion of the trunk portion. Then a piece or a small number of fibers are fed from a rotating hoop winding head to the trunk portion, and hoop winding is performed on helical winding layers formed around the trunk portion. Then, at the one end portion of the trunk portion, the large number of fibers pulled from the yarn-feeding sections of the helical winding head are cut off.

Abstract: An object of the present invention is to provide a technique for suppressing an occurrence of weld in a pressure vessel liner. A film gate 42 for molding a pressure vessel liner 1 is located on a radially outer side of an outer peripheral end portion of an meshing portion 3 in the pressure vessel liner 1. By disposing the film gate 42 on the radially outer side of the meshing portion 3 with a sufficient space between, it is possible to control the flow rate of the molten resin during molding, thereby suppressing an occurrence of weld.

Abstract: Disclosed is a filament winding device wherein an FRP layer is prevented from becoming thick by avoiding piled fibers in the case of the feeding of multiple filaments when a plurality of fibers are fed simultaneously. For realizing this theme, a filament winding device moves a fiber guide member equipped with a plurality of fiber feeding ports relatively in an axial direction of a wound member rotating relatively about the axis, and feeds fibers through the fiber feeding ports to wind the fibers around the wound member, wherein the fiber feeding ports are provided only in part of the fiber guide member. When the fiber guide member is moved relatively in the axial direction of the wound member, a plurality of fibers are fed only from one side when viewed from the wound member and the fibers are wound around the wound member while being gathered on the periphery of the wound member.

Abstract: In a filament winding method, while a rotating tank relatively reciprocates in a tank axial direction to a helical winding head, fibers are fed from yarn-feeding sections to the tank. After the tank turns back in the tank axial direction, a large number of fibers are wound around one domed portion and a trunk portion of the tank, and trailing ends of the large number of fibers are located at one end portion of the trunk portion. Then a piece or a small number of fibers are fed from a rotating hoop winding head to the trunk portion, and hoop winding is performed on helical winding layers formed around the trunk portion. Then, at the one end portion of the trunk portion, the large number of fibers pulled from the yarn-feeding sections of the helical winding head are cut off.

Abstract: Disclosed is a filament winding device wherein an FRP layer is prevented from becoming thick by avoiding piled fibers in the case of the feeding of multiple filaments when a plurality of fibers are fed simultaneously. For realizing this theme, a filament winding device moves a fiber guide member equipped with a plurality of fiber feeding ports relatively in an axial direction of a wound member rotating relatively about the axis, and feeds fibers through the fiber feeding ports to wind the fibers around the wound member, wherein the fiber feeding ports are provided only in part of the fiber guide member. When the fiber guide member is moved relatively in the axial direction of the wound member, a plurality of fibers are fed only from one side when viewed from the wound member and the fibers are wound around the wound member while being gathered on the periphery of the wound member.

Abstract: There are disclosed a tank having a structure which achieves both a burst strength and a fatigue strength, and a manufacturing method of the tank. In order to realize this, in a tank comprising a liner, and an FRP layer including a hoop layer and a helical layer formed by winding fibers around the outer periphery of the liner, at least an innermost helical layer is formed as a smooth helical layer. When the smooth helical layer, i.e., a helical layer which does not have any unevenness or which has only little unevenness is formed, the unevenness can be prevented from being transferred to the hoop layer adjacent to the helical layer. When structural bends (undulations) of the fibers of the hoop layer are suppressed, a fatigue strength of the fibers themselves can be enhanced.