A method for producing a high-pressure tank that can, when forming a reinforcement layer following a previous reinforcement layer using fiber bundles, ensure the strength of the tank by reducing disturbance of the orientation of the fiber bundles. The method is adapted to form each reinforcement layer by winding fiber bundles while holding a preset tension for each layer, and includes a winding start step of stopping rotation of the tank liner upon completion of formation of at least one of the reinforcement layers, and, at the start of forming a following reinforcement layer, winding the fiber bundles at a tension smaller than a preset tension for the following reinforcement layer while alternately repeating rotation of the tank liner in the forward direction and the reverse direction, thereby forming a winding start portion of the following reinforcement layer; and a main winding step of winding the fiber bundles at the preset tension after the winding start step, so as to complete the formation of the following reinforcement layer.

An apparatus for forming an inflatable closing plug has a winding head rotatable around a path defining a winding plane. The winding head is arranged to dispense one or more continuous lines from a supply of line via a guide arrangement. A preform is rotationally supported on an axis at a shallow angle with respect to the winding plane such than the winding plane intersects the preform. By providing a spreading arrangement to locate the windings on the preform over a band having a width perpendicular to the winding plane, a smoother distribution of windings can be achieved.

An apparatus for forming an inflatable closing plug has a winding head rotatable around a path defining a winding plane. The winding head is arranged to dispense one or more continuous lines from a supply of line via a guide arrangement. A preform is rotationally supported on an axis at a shallow angle with respect to the winding plane such than the winding plane intersects the preform. By providing a spreading arrangement to locate the windings on the preform over a band having a width perpendicular to the winding plane, a smoother distribution of windings can be achieved.

A manufacturing method of a tank comprises winding a fiber on a liner by hoop winding. The winding comprises: forming an (N+1)-th layer such that a position closer to a center of the liner by a first predetermined distance along an axis line direction of the liner from an end in the axis line direction of an N-th layer is set to position of an end in the axis line direction of the (N+1)-th layer with respect to a direction perpendicular to the axis line direction; and winding the fiber on the N-th layer to provide one winding turn of the fiber, such that a pressing force of pressing the N-th layer in the axis line direction by the fiber is equal to or smaller than a total frictional force in an area in the N-th layer on an edge side in the axis line direction of a fiber winding position.

A manufacturing method of a tank comprises winding a fiber on a liner by hoop winding. The winding comprises: forming an (N+1)-th layer such that a position closer to a center of the liner by a first predetermined distance along an axis line direction of the liner from an end in the axis line direction of an N-th layer is set to position of an end in the axis line direction of the (N+1)-th layer with respect to a direction perpendicular to the axis line direction; and winding the fiber on the N-th layer to provide one winding turn of the fiber, such that a pressing force of pressing the N-th layer in the axis line direction by the fiber is equal to or smaller than a total frictional force in an area in the N-th layer on an edge side in the axis line direction of a fiber winding position.

An electromagnetic coil with improved insulation properties at high temperatures. A bobbin is insulated by a thin ceramic composite layer that is produced by winding a glass or ceramic fiber over the support structure and impregnating it with a pre-ceramic polymer. The pre-ceramic polymer is then modified to form a ceramic SiO.sub.2 matrix around the fibrous layer. The ceramic matrix secures the glass or ceramic fibers in place and produces a dense layer. A ceramic coated magnet wire is then wound around the insulated support structure. The magnet wire is a conductor that is spiral-wrapped with a glass fiber impregnated with a pre-ceramic polymer.

An electromagnetic coil with improved insulation properties at high temperatures. A bobbin is insulated by a thin ceramic composite layer that is produced by winding a glass or ceramic fiber over the support structure and impregnating it with a pre-ceramic polymer. The pre-ceramic polymer is then modified to form a ceramic SiO.sub.2 matrix around the fibrous layer. The ceramic matrix secures the glass or ceramic fibers in place and produces a dense layer. A ceramic coated magnet wire is then wound around the insulated support structure. The magnet wire is a conductor that is spiral-wrapped with a glass fiber impregnated with a pre-ceramic polymer.

A process for manufacturing a non-degumming, seamless and surface-laminated basketball, comprising the steps of: step 1: wrapping the inner bladder by threads, thereby shaping the carcass; step 2: preparing the uncured foamed middle bladder; step 3: preparing the half-finished PU surface-laminated ball; step 4: placing the half-finished leather ball obtained from step 3 into a curing mold; subsequently, curing under low temperature and low pressure via the thermal cross-linking method, thereby forming the cured PU foamed basketball; Step 5: testing the air-holding performance of the PU foamed basketball being cured under a low temperature and mounting the air nozzle, thereby obtaining the finished basketball; by means of the present invention, the prior curing process of the middle bladder and related downstream process can be saved.

A process for manufacturing a non-degumming, seamless and surface-laminated basketball, comprising the steps of: step 1: wrapping the inner bladder by threads, thereby shaping the carcass; step 2: preparing the uncured foamed middle bladder; step 3: preparing the half-finished PU surface-laminated ball; step 4: placing the half-finished leather ball obtained from step 3 into a curing mold; subsequently, curing under low temperature and low pressure via the thermal cross-linking method, thereby forming the cured PU foamed basketball; Step 5: testing the air-holding performance of the PU foamed basketball being cured under a low temperature and mounting the air nozzle, thereby obtaining the finished basketball; by means of the present invention, the prior curing process of the middle bladder and related downstream process can be saved.

A percutaneous catheter for an extracorporeal blood circulator has a tubular reinforcement body comprised of a plurality of wires braided in a reticulated manner. The braided wires include first wires wound in a first helical direction and second wires wound in a second helical direction crossing the first wires to define regular gap portions. A portion of the first and second wires are deviated from the helical directions to enlarge a selected gap portion into a first opening portion. A resin layer coats the reinforcement body and includes a second opening portion coincident with the first opening portion to form a side hole for fluid communication between an interior lumen and an exterior of the catheter. A continuous reinforcement is provided between longitudinal ends of the tubular reinforcement body including a longitudinal region of the side hole.