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FP5

TEXFLAX Résumé de rapport

Project ID: G5ST-CT-2001-50111
Financé au titre de: FP5-GROWTH
Pays: United Kingdom

Fully optimised yarns for use in composite applications

A major outcome of the project so far is the development of optimised pre-yarns for textiles for composite applications. Textile technology for natural fibres like flax has clearly a long history but all flax fabrics that are currently on the market are for pure textile applications like linen. Engineering fabrics for composite applications need very different requirements than plain textile applications and it is exactly this innovation, which has been delivered in the first part of the TEXFLAX project.

The development of tailor made pre-yarns mean a major breakthrough in natural fibre processing and opens up market possibilities for the development of textile reinforcements for composites. The development of these pre-yarns for composites was one - if not the main challenge - in the first part of the project.

One of the main problems that needed to be solved here was to find the optimal yarn construction for use in composites. Traditional flax yarns have been used in textiles like linen but these yarns are very fine and have a very high level of twist and are as such difficult to impregnate with polymer resin and therefore not useful for use in composites.

The key to the success was to develop a yarn with a minimum amount of twist that is still processable on the machinery of the various textile producing SME’s Optimised yarns were developed for composites which exhibit a good balance in textile processing (e.g. exhibit a good dry strength which is needed to prevent the yarn from breaking during textile processes such as weaving or knitting) and composite processing (e.g. exhibit a good permeability for easy impregnation with polymer resin).

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