Method and system for producing a multi-layer, pre-fixed...

D - Textiles – Paper – 04 – B

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D04B 21/14 (2006.01) D04B 23/10 (2006.01)

Patent

CA 2467483

The invention relates to a method and a system for producing a multi-layer thread or fibre arrangement (GF) which is pre-fixed by means of a loop structure and is used as a strip-type semi-finished product for reinforcing elements consisting of plastic or resin. Said fibre arrangement (GF) comprises layers consisting of stationary weft yarns (K) and layers consisting of thread or fibre warps (S, D, D') which are stretched between conveyor chains in such a way that they are oriented in different directions. The aim of the invention is to reduce the costs and the required surface mass, simultaneously maintaining defined, required flexural strength. To this end, the method is designed in such a way that the stationary weft layer (KR) consisting of fibre or thread warps and oriented parallel to the working direction is located directly adjacent to the needle loops (WN) of the loop structure, and needle loops (WNv) of the loop structure cross the threads or fibres of the stationary weft layer, in the knock-over phase, before the knitting needles (1) penetrate the thread arrangement (G) in order to create a successive row of loops.

L'invention concerne un procédé et une unité de production d'une structure de fils ou de fibres (GF) multicouche, préfixée à l'aide d'une combinaison de mailles et utilisée comme demi-produit en bande pour armer des parties en matière plastique ou en résines. Selon cette invention, cette structure de fils (GF) comprend des couches de fils de trame fixes (K) et des couches de nappes de fils ou de fibres (S, D, D'), étirées entre des chaînes de transport avec des orientations différentes. L'objectif de cette invention est de réduire les coûts et diminuer la masse superficielle nécessaire pour garantir une rigidité flexionnelle requise déterminée. A cet effet, ledit procédé est mis en oeuvre, de sorte que la couche de trame fixe (KR), constituée de nappes de fibres ou de fils et orientée parallèlement au sens de travail, est agencée de façon directement adjacente aux mailles d'aiguille (WN) de ladite combinaison de mailles et de sorte que des mailles d'aiguille (WNv) de cette combinaison croisent les fils ou fibres de la couche de trame fixe dans la phase d'abattage, avant que les aiguilles à tricoter (1) ne pénètrent à nouveau dans la structure de fils (G) afin de former une rangée de mailles suivante.

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