Abstract: A fiber structure that includes a liner, and a fiber reinforcement base material formed of a fabric. The fiber reinforcement base material externally covers a body portion and a dome-shaped portion of the liner, and includes first yarns and second yarns. The first yarns are arranged such that a direction in which a yarn main axis of each of the first yarns in the body portion and the dome-shaped portion proceeds is a circumferential direction of the liner. The second yarns are arranged such that a direction in which a yarn main axis of each of the second yarns in the body portion proceeds is an axial direction of the body portion and that a direction in which a yarn main axis of a portion of each of the second yarns arranged in the dome-shaped portion proceeds is an axial direction of the dome-shaped portion.

Abstract: A high-pressure tank fabrication method includes a pre-form fabrication step and a molding step. In the pre-form fabrication step a pre-form is fabricated by winding dry fiber bundles with different thicknesses (first fiber bundles and second fiber bundles) onto a liner in a state in which the dry fiber bundles with different thicknesses are made to be adjacent to one another. In the molding step, molding includes disposing the pre-form fabricated in the pre-form fabrication step in a mold and injecting resin.

Abstract: A method of winding a flexible core includes forming a flexible core member having a first end portion, a second end portion and a plurality of teeth each having a central axis with the plurality of teeth being arranged in a substantially linear array. The method also includes manipulating the flexible core member into an inverted core form having an outer portion and an inner portion with the plurality of teeth extending out from the outer portion away from the inner portion, positioning a winding member including an amount of wire adjacent one of the plurality of teeth, and rotating the flexible core member about the central axis of the one of the plurality of teeth. The method further includes applying wraps of the wire to the one of the plurality of teeth.

Abstract: A wound electrochemical device has a wound body formed by winding a multilayer member including a multilayer structure composed of a positive electrode, a separator, and a negative electrode; wherein each of the positive and negative electrodes, includes a structure having an active material layer formed on both sides of a current collector; wherein the wound body has a space at a center portion thereof; and wherein the smallest radius of curvature R of a curved part in an innermost circumferential portion of the wound body satisfies the following expression (1): R=?×(T1+2T2)??(1) where R is the smallest radius of curvature of the curved part in the innermost circumferential portion of the wound body (unit: ?m), ? is a value within the range of 3.33 to 7.

Abstract: A filament winding apparatus that efficiently and orderly winds a fiber bundle with respect to a mandrel in a short period of time. A supporting board supports the mandrel, and a helical winding head supplies and guides the fiber bundle towards the mandrel. The helical winding head includes a group of guide tubes radially arranged on a circumferential surface of a guide ring, and a tube operation mechanism that reciprocates the guide tube along a tube axis center direction. The guide tube is moved closer to a circumferential surface of the dome part when the guide tube is facing a dome part of the mandrel such that the distance between the winding position of the fiber bundle and the guide tube at the dome part can be reduced, and the fiber bundle is orderly wound according to an appropriate winding trajectory.

Abstract: The present invention relates to apparatus and methods for winding filament to create a structure. In one embodiment, the invention includes the application of filament to a rotating mandrel to create a desired shape. The invention includes the filament winding of both simple and complex shapes.

Abstract: A process and apparatus for controlling the deposition of roving by winding or by contact on large structures, in which deposition is carried out on a mandrel (1) driven in rotation about its axis (.theta.). A deposition head (6) is adjustable in position along at least a first rectilinear axis (X) of movement parallel to the axis of rotation (.theta.) of the mandrel. The head (6) is also movable along a second axis of rectangular displacement (Y) orthogonal to the axis of the mandrel. The axis of rotation (.theta.) of the mandrel is taken as a master axis and the other axes (X, Y, .beta., .gamma., 8, 9) are made subservient to the master axis. The master axis (.theta.) is controlled by speed orders according to a pre-established program and from a pre-established trajectory table (21). The slave axes are made subservient as a function of the angular position of the master axis, from the instantaneous angular position of the master axis (.theta.

Abstract: The present invention is directed towards a multi-layer golf ball cover formed by a sandwich injection molding process, wherein said golf ball cover comprises an inner layer and an outer layer of a first material and an intermediate layer therebetween of a second material. The present invention is directed towards a sandwich injection molding process for forming a multi-layer golf ball cover involving the steps of pushing a measured amount of a plasticized first material into one end of an accumulation cylinder, pushing a measured amount of a plasticized second material into the opposite end of the accumulation cylinder, and injecting both materials in a single plunging step, so that the first material substantially coats the surface of the mold while the second material substantially fills the interior of the first material.