The invention refers to a method of manufacturing a pressure tank, comprising an inner container and an outer layer made of a fiber material which is wound around the inner container. In performing the method, a retention device with several retention elements protruding therefrom is attached to an inner container so as to wind a local pole cap reinforcement in a dome-shaped pole cap portion of the inner container. Then the retention device is removed and an outer layer is produced by winding of fiber material, the outer layer surrounding the central portion and the pole cap portions of the inner container.

The invention refers to a method of manufacturing a pressure tank, comprising an inner container and an outer layer made of a fiber material which is wound around the inner container. In performing the method, a retention device with several retention elements protruding therefrom is attached to an inner container so as to wind a local pole cap reinforcement in a dome-shaped pole cap portion of the inner container. Then the retention device is removed and an outer layer is produced by winding of fiber material, the outer layer surrounding the central portion and the pole cap portions of the inner container.

A filament winding device includes: a supporting unit that supports a mandrel on which a plurality of fiber bundles impregnated with a resin are wound, the supporting unit movable in the axial direction of the mandrel; and a helical unit having a plurality of fiber bundle guide units arranged radially in the circumferential direction of the mandrel and guide the corresponding plurality of fiber bundles to the mandrel, the helical unit supplying the plurality of fiber bundles to the mandrel through the fiber bundle guide units. Each of the fiber bundle guide units has a pressing roller for pressing a fiber bundle supplied to the mandrel, against the circumferential surface moving in the axial direction. The pressing roller can come into the contact with the circumferential surface of the mandrel and be rotationally driven about a roller axis extending in a roller axis direction perpendicular to the axial direction.

A method and apparatus to hold pressurized gas is disclosed. Shell halves having opposing apertures with inserted tubes are combined to create an enclosed pressure vessel. Strands of Kevlar fiber and strands of carbon fiber cover the shell by wrapping the shell through the tubes. Resin coats the wrapped strands and fills the tubes. Pressurized gas is injected and retrieved from the pressure vessel.

A method and apparatus to hold pressurized gas is disclosed. Shell halves having opposing apertures with inserted tubes are combined to create an enclosed pressure vessel. Strands of Kevlar fiber and strands of carbon fiber cover the shell by wrapping the shell through the tubes. Resin coats the wrapped strands and fills the tubes. Pressurized gas is injected and retrieved from the pressure vessel.

An assembly for debulking an uncured stack of plies of fiber reinforced composite material positioned on a forming tool, including a force application element and a heat source, associated with the force application element. The heat source is positioned in at least one of the following positions: spaced apart from a top ply to directionally heat the uncured stack of plies from the top ply through a bottom ply of the uncured stack of plies; with the forming tool positioned between the heat source and the uncured stack of plies, the heat source to heat the forming tool, to directionally heat the uncured stack of plies in a direction from the bottom ply through the top ply; or between the uncured stack of plies and the forming tool, to directionally heat the uncured stack of plies in the direction from the bottom ply through the top ply.

An assembly for debulking an uncured stack of plies of fiber reinforced composite material positioned on a forming tool, including a force application element and a heat source, associated with the force application element. The heat source is positioned in at least one of the following positions: spaced apart from a top ply to directionally heat the uncured stack of plies from the top ply through a bottom ply of the uncured stack of plies; with the forming tool positioned between the heat source and the uncured stack of plies, the heat source to heat the forming tool, to directionally heat the uncured stack of plies in a direction from the bottom ply through the top ply; or between the uncured stack of plies and the forming tool, to directionally heat the uncured stack of plies in the direction from the bottom ply through the top ply.

The invention relates to a tape, comprising at least one layer comprising a. endless fiber in an total amount of at least 40 volume % as compared to the total volume of the layer and b. a thermoplastic matrix comprising one or more polyamides containing one or more aliphatic monomeric units, c. and optionally heat stabilizer, flame retardant, colorant, lubricant, mold release agent, UV stabilizer, impact modifier, laser absorbing additive as well as combinations thereof; wherein the one or more polyamides have a CH2-ratio of at least 5.5 and less than 10, calculated by—identifying the number of different aliphatic monomeric units in the one or more polyamides; —determining the number of CH2 groups per aliphatic monomeric unit for each of these different aliphatic monomeric units; —calculating the sum of the so determined numbers of CH2 groups; —dividing said sum by the number of different aliphatic monomeric units in the one or more polyamides; taking into account only the aliphatic monomeric units present in the one or more polyamides in an amount of at least 10 wt % with respect to the total weight of the one or more polyamides. The invention also relates to a vessel prepared by employing these tapes.

The present disclosure relates to a fibre reinforced polymer (FRP) tube, the tube comprising a plurality of concentric layers of an FRP material forming a shell of the tube. At least one blind threaded longitudinal bolt hole is provided from a transverse end surface of the shell. The bolt hole extends in at least three of the plurality of layers, a middle layer encompassing a plane passing through a center of the bolt hole, an inner layer encompassing a plane of an innermost extent of the bolt hole, and an outer layer encompassing a plane of an outermost extent of the bolt hole. The fibre filament of each of the inner and outer layers has been wound at a first angle to the longitudinal axis and the fibre filament of the middle layer has been wound at a second angle to the longitudinal axis.

The present disclosure relates to a fibre reinforced polymer (FRP) tube, the tube comprising a plurality of concentric layers of an FRP material forming a shell of the tube. At least one blind threaded longitudinal bolt hole is provided from a transverse end surface of the shell. The bolt hole extends in at least three of the plurality of layers, a middle layer encompassing a plane passing through a center of the bolt hole, an inner layer encompassing a plane of an innermost extent of the bolt hole, and an outer layer encompassing a plane of an outermost extent of the bolt hole. The fibre filament of each of the inner and outer layers has been wound at a first angle to the longitudinal axis and the fibre filament of the middle layer has been wound at a second angle to the longitudinal axis.