Continuous-strand pellets and method and device for...

B - Operations – Transporting – 29 – B

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B29B 9/06 (2006.01) B29B 9/14 (2006.01)

Patent

CA 2333126

The invention relates to continuous-strand pellets consisting of particles in which reinforcing staple fibres are arranged in a thermoplastic matrix in a helical manner. Said pellets are characterized in that the reinforcing staple fibres together with molten matrix material are situated in a peripheral area of the particles and together with unmolten thermoplastic staple fibres are present in a core area. The invention also relates to a method for producing continuous-strand pellets from a staple-fibre mixture consisting of thermoplastic fibres and reinforcing fibres. According to said method a ribbon consisting of the staple fibre mixture is fed through a preheating zone and drawn through a heating nozzle to form a strand which after twisting and consolidation by cooling is cut into continuous-strand pellets. The invention is characterized in that the strand is first cooled and then rotated and taken off and finally freely rotated without interference by the cutting process.

Granulat à longues fibres constitué de granulés possédant des fibres discontinues de renforcement placées de manière hélicoïdale dans une matrice thermoplastique. Ledit granulat est caractérisé en ce que les fibres discontinues de renforcement se trouvent avec de la matière de matrice fondue dans une zone de superficielle des granulés et sont présentes avec des fibres discontinues thermoplastiques non fondues dans une zone de coeur. La présente invention concerne également un procédé de fabrication de granulat à longues fibres à partir d'un mélange de fibres discontinues, thermoplastiques et de renforcement, qui consiste à faire passer une bande de fibres provenant du mélange de fibres discontinues dans une zone de préchauffage, à étirer ladite bande à travers une buse chauffante pour obtenir un cordon et à couper le cordon en tronçons après tordage et consolidation par refroidissement pour obtenir un granulat à longues fibres. Ledit procédé est caractérisé en ce que le cordon est d'abord refroidi, puis tordu et étiré et enfin laissé en rotation libre, sans entrave due au processus de coupe.

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