A method for manufacturing a thick polyimide film includes providing a first and second laminated structures. The first and second laminated structures are heated, and the heated first and second laminated structures are wound together to form a third laminated structure. The first polyamic acid gel film of the heated first laminated structure and the second polyamic acid gel film of the heated second laminated structure are overlapped and bonded together to form a third polyamic acid gel film. Two third laminated structures are wound together to form a fourth polyamic acid gel film. A dehydration ring-closure imidization reaction is applied to the fourth polyamic acid gel film by heating to obtain the thick polyimide film. A thick polyimide film manufactured by the method is also disclosed.

A method for manufacturing a thick polyimide film includes providing a first and second laminated structures. The first and second laminated structures are heated, and the heated first and second laminated structures are wound together to form a third laminated structure. The first polyamic acid gel film of the heated first laminated structure and the second polyamic acid gel film of the heated second laminated structure are overlapped and bonded together to form a third polyamic acid gel film. Two third laminated structures are wound together to form a fourth polyamic acid gel film. A dehydration ring-closure imidization reaction is applied to the fourth polyamic acid gel film by heating to obtain the thick polyimide film. A thick polyimide film manufactured by the method is also disclosed.

A multilayer structure selected from a reservoir, a pipe or a tube, for transporting, distributing or storing hydrogen, including, from the inside to the outside, at least one sealing layer and at least one composite reinforcing layer, the innermost composite reinforcing layer being welded to the outermost adjacent sealing layer, the sealing layers including at least one semi-crystalline thermoplastic polymer, the Tm of which is less than 280° C., wherein the at least one thermoplastic polymer of each sealing layer may be the same or different, and at least one of the composite reinforcing layers being of a fibrous material in the form of continuous fibers impregnated with a composition of at least one thermoplastic polymer P2j, the thermoplastic polymer P2j having a Tg greater than the maximum temperature of use of said structure (Tu), with Tg≥Tu+20° C., Tu being greater than 50° C.

Embodiments are directed to systems and methods for creating a tubular composite structure. In one embodiment, a device comprises multiple layers of cured composite fabric bonded together to form a tubular composite structure, wherein alternating groups of the multiple layers comprise on-axis fabric and off-axis fabric. The tubular composite structure may form a spar for an aerodynamic component. The composite fabric may comprise one or more of carbon, fiberglass, or other composite materials, or a combination of materials. One or more stacks of the fabric wrap completely around the tubular composite structure, and other stacks of fabric may not wrap completely around the tubular composite structure.

A fiber composite component has two inner elements arranged at a distance from one another, around which inner elements a fiber-reinforced plastics band is wrapped. In order to simplify the production of the fiber composite component, a first fiber-reinforced plastics band is wrapped around a first inner element, and a second fiber-reinforced plastics band is wrapped around a second inner element. The first and the second fiber-reinforced plastics band are wrapped alternately around the first and the second inner element in such a manner that the distance between the inner elements is bridged by the first and the second fiber-reinforced plastics band.

A fiber composite component has two inner elements arranged at a distance from one another, around which inner elements a fiber-reinforced plastics band is wrapped. In order to simplify the production of the fiber composite component, a first fiber-reinforced plastics band is wrapped around a first inner element, and a second fiber-reinforced plastics band is wrapped around a second inner element. The first and the second fiber-reinforced plastics band are wrapped alternately around the first and the second inner element in such a manner that the distance between the inner elements is bridged by the first and the second fiber-reinforced plastics band.

A method of manufacturing a composite material includes forming a conductive layer comprising one or more conductive filaments embedded in a polymeric matrix, forming a composite substrate comprising a polymeric matrix with fibre reinforcement and curing the polymeric matrix of the conductive layer and the polymeric matrix of the composite substrate.

An elongate tubular shaft body having a stack of wrapped layers of fibrous reinforcement in a resin matrix, a portion of the stack of wrapped layers circumferentially surrounding a first surface part of a fibrous layer has a non-constant width which varies non-linearly with a change in radius of an inner elongate circumferential surface in the portion, and wherein the fibrous reinforcement has fibres that are, along the length of the elongate tubular body, constantly oriented with respect to a cylindrical coordinate system about the longitudinal axis of the elongate tubular body, the fibre orientation in any said portion being independent of the geometry of the inner and outer elongate circumferential surfaces of that portion.

A compacter that includes a compacting roller assembly, borne by a support element. The roller assembly includes a straight central shaft, having a longitudinal axis, and a plurality of compacting rollers, mounted parallel to one another about the central shaft, each compacting roller having a peripheral surface rotating around the central shaft about a roller axis. The longitudinal axis of the central shaft is parallel to the central axis of the support element. Each roller axis is inclined by a nonzero incline angle relative to the longitudinal axis of the central shaft.

A method of sealing a wiring-harness includes the steps of: a) dispensing a length of a sealing-tape onto a platform, the sealing-tape having a first-surface and a second-surface opposite the first-surface. b) separating a plurality of wire-cables from a portion of the wiring-harness. c) applying the plurality of wire-cables to a first-half of the first-surface of the sealing-tape. d) folding a second-half of the sealing-tape over the separated plurality of wire-cables such that the second-half overlays the first-half. e) pressing the second-half of the sealing-tape such that the second-half contacts the first-half between the separated plurality of wire-cables, thereby forming a cable-band. f) coiling the cable-band into a generally cylindrical-shaped seal. g) compressing the cylindrical-shaped seal isostatically such that interstitial-voids within the cylindrical-shaped seal are reduced in size. An apparatus for sealing a wiring-harness is also provided.