Needled glass mat

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 3/10 (2006.01) D04H 13/00 (2006.01)

Patent

CA 2547340

The invention relates to a method of preparing a needled glass mat. The inventive method comprises the following steps consisting in: a) depositing or projecting fibres onto a conveyor in order to form a blanket of said fibres, which is driven by the conveyor; b) and needling using barbed needles which pass through the blanket and move in the direction of said blanket at essentially the same speed of same while passing therethrough, with a punch density varying between 1 and 25/cm?2¿. The invention is quick and effective and the mat produced can be easily deformed by hand in order to be placed in a resin-injected composite production mould (RTM). The inventive mat can also be incorporated in a sheet moulding compound (SMC) and pressure moulded.

L'invention concerne un procédé de préparation d'un mat comprenant a) la dépose ou projection de fils sur un tapis défilant pour former une nappe desdits fils entraînée par ledit tapis, puis b) l'aiguilletage par des aiguilles à barbes traversant ladite nappe et se déplaçant dans la direction de la nappe à sensiblement la même vitesse qu'elle lorsqu'elles la traversent, avec une densité de coups allant de 1 à 25 coups par cm . Ce procédé est rapide et efficace et le mat obtenu se laisse facilement déformer à la main pour être placé dans un moule de fabrication de composite par injection de résine (RTM). Ce mat peut également être incorporé dans une feuille de préimprégné (SMC) et être moulé sous pression.

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