Production of continuous filament mats

D - Textiles – Paper – 04 – H

Patent

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Details

D04H 3/05 (2006.01) B65H 59/38 (2006.01) C03B 37/03 (2006.01)

Patent

CA 2550427

The invention relates to an installation and method for the preparation of a mat of continuous filaments from at least one roving by projecting same onto a conveyor belt. The invention comprises the following steps consisting in: unwinding from the exterior at least one roving bobbin which is supported on a shaft, the unwinding speed being imposed by a motor that actuates the bobbin directly such that the linear speed of the unwound roving is constant; passing the roving through a nozzle, whereby the roving is passed through an inlet and, subsequently, an outlet of the nozzle, said nozzle also being equipped with a transverse inlet for at least one fluid which is directed mainly towards the outlet of the nozzle, thereby producing a tension towards the bottom of the roving and causing said roving to divide; and projecting the roving-forming filaments onto the conveyor belt using an oscillatory movement. The invention can be used to produce continuous filament mats at great speed with little or no roving breakage, owing to the fact that the roving is only subjected to a low tension which is produced at the nozzle by the divider fluid.

L'invention concerne une installation et un procédé de préparation d'un mat à fils continus issus d'au moins une mèche par projection sur un tapis-convoyeur comprenant : - le déroulement par l'extérieur d'au moins une bobine de mèche supportée sur un axe, la vitesse dudit déroulement étant imposée par un moteur actionnant directement la bobine de façon à ce que la vitesse linéaire de la mèche déroulée soit constante, puis - le passage de la mèche à travers une buse en passant par une entrée puis une sortie de la buse, ladite buse étant par ailleurs munie d~une arrivée transversale d~au moins un fluide, ledit fluide étant dirigé principalement vers la sortie de la buse provoquant une tension vers le bas de la mèche, ledit fluide provoquant également la division de la mèche, puis - la projection selon un mouvement d~oscillation des fils formant la mèche sur ledit tapis-convoyeur. L~invention permet la fabrication de mats à fils continu à grande vitesse, avec très peu voire pas de casse de mèche, du fait que la mèche ne subit qu~une faible tension qui lui est conférée au niveau de la buse par le fluide de division.

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