A pressure vessel having a hollow body wound with a continuous filament, whereby the filament is embedded in a thermoplastic matrix, is provided, as well as a method for producing such a vessel. The method involves: (i) wrapping a hollow body with at least one continuous filament; (ii) impregnating the filament winding with a polymerizable mixture, whereby the wound body is inside a mold that surrounds the wound body; and (iii) polymerizing the polymerizable mixture in order to form a plastic matrix that embeds the filament winding.

Additive manufacturing fiber tows comprise a bundle of elongate fibers. Bindments, which may include particles, elongated bindment segments, coating segments, and/or encircling bindments are interposed among the plural elongate fibers to provide interstitial regions among the plural elongate fibers and the bindments. Methods of additively manufacturing an article with a configuration comprise dispensing the additive manufacturing fiber tow with bindments in multiple successive courses in the configuration to additively manufacture the article. The methods may include fixing the bindments together to hold the article in the configuration with the interstitial regions among the plural elongate fibers and the bindments. A solidifiable matrix material may be applied to the article, including to the interstitial regions, and the solidifiable matrix material may be solidified to form a finished article.

The present disclosure provides a method of manufacturing a composite laminate structure of a wind turbine blade part by means of resin transfer moulding, preferably vacuum-assisted resin transfer moulding. In a resin transfer moulding, fibre-reinforcement material is impregnated with liquid resin in a mould cavity. The mould cavity comprises rigid mould part having a mould surface defining a surface of the wind turbine blade part.

The method comprises alternately stacking on the rigid mould part: i. a number of unidirectional fibre-reinforcement layers comprising electrically conductive fibres, such as carbon fibres, and ii. a flow-enhancing fabric layer for enhancing a flow of the resin during infusion of the fibre-reinforcement layers, the flow-enhancing fabric layer comprising an open-structured layer made of a first material, wherein the flow-enhancing fabric layer comprises a longitudinal direction and a transverse direction,

The flow-enhancing fabric layer further comprises filaments or bundles of fibres made of a second material, which is an electrically conductive material and which are arranged and configured to provide a conductive path from first electrically conductive fibres of a first fibre-reinforcement layer on a first side of the flow-enhancing layer to second electrically conductive fibres of a second fibre-reinforcement layer on a second side of the flow-enhancing layer.

A wind turbine composite laminate component and method for producing it is disclosed as initially assembling a laminated structure having at least two reinforced layers and a plurality of interleaf layers positioned adjacent to one of the at least two reinforced layers. Then placing the laminated structure into a mold where resin is sequentially and independently transferred into each of the plurality of interleaf layers. Then curing the transferred resin in the laminated structure to form a composite laminate component having the at least two reinforced layers, the plurality of interleaf layers, and cured resin.

A method of manufacturing a composite laminate structure of a wind turbine blade part is performed by resin transfer moulding. The fibre-reinforcement material is impregnated with liquid resin in a mould cavity which includes a rigid mould part having a mould surface defining a surface of the wind turbine blade part. The method includes alternately stacking on the rigid mould part: i) a number of fibre-reinforcement layers including electrically conductive fibres and ii) a flow strip layer in form of a layer of flow strips having a strip width and which are arranged so as to form voids having a void width between two juxtaposed strips. The method includes sealing a second mould part against the rigid mould part in order to form the mould cavity, optionally evacuating the mould cavity, supplying a resin to the mould cavity, and curing the resin to form the composite laminate structure.

In a method for producing a fiber composite component by vacuum injection, a fiber composite semifinished product is arranged in a component chamber of a tool. A vacuum chamber is arranged adjacent to the component chamber. The vacuum chamber is separated from the component chamber by a separation material. Component chamber and vacuum chamber are sealed relative to the tool environment by a gas-tight and matrix-material tight cover material. Vacuum is applied to the vacuum chamber and a matrix material is introduced into the component chamber. The matrix material is cured and the finished fiber composite component is removed from the component chamber. The separation material separating the vacuum chamber from the component chamber has a pore size between 0.4 m and 30 m and provides a matrix material-slowing action but is not matrix material-tight.

The present invention concerns preforms made with a new intermediate material composed of a unidirectional layer of carbon fibers with a weight of 100 to 280 g/m.sup.2, associated on each of its faces, with a web of thermoplastic fibers having a thickness of 0.5 to 50 microns, preferably 3 to 35 microns, the intermediate material having a total thickness of 80 to 380 microns, preferably from 90 to 320 microns, and a process for manufacturing composite parts from such preforms and the resulting composite parts.

A flexible, self-supporting hybrid veil that is permeable to liquid and gas. The hybrid veil includes: (a) intermingled, randomly arranged fibres in the form of a nonwoven structure; (b) particles dispersed throughout the nonwoven structure, wherein a majority of the particles are penetrating through the thickness of the nonwoven structure; and (c) a polymeric or resinous binder present throughout the veil. Such hybrid veil can be incorporated into composite laminates, prepregs, fabrics and fibrous preforms.

In a method for producing a hull wall of a fiber composite sandwich component, shaped bodies of extruded polystyrene hard foam are enveloped with an envelope of fiber composite material with fibers oriented at least bidirectionally. The enveloped shaped bodies have a shape for forming a hull wall and are placed next to each other in a vacuum injection structure on a lower cover layer of fiber composite material. An upper cover layer of fiber composite material is placed on top of the enveloped shaped bodies and the vacuum injection structure is sealed. Matrix material is introduced and distributed in the vacuum injection structure until the fiber composite material of the envelopes and of the upper and lower cover layers is impregnated completely with the matrix material. The matrix material is cured and the fiber composite sandwich component of the hull wall is removed from the vacuum injection structure.

Method of making a spar cap includes: providing a plurality of composite strips, each strip being of constant cross section defined by first and second sides and edges, the first and second sides comprising first and second abutment surfaces, the strip being of uniform thickness between the abutment surfaces, a first edge region of the strip comprising a first edge being of relatively reduced thickness, the first side of the strip comprising an edge surface, and the strip having a peel ply layer at least partially covering the first abutment surface and the edge surface; removing the peel ply layers; stacking the strips such that the first abutment surface abuts an abutment surface of an adjacent strip to define an interface region, such that a clearance region is defined; supplying resin to the respective clearance regions and causing the resin to infiltrate into the interface regions; and curing the resin.