Flash-spinning apparatus and process

D - Textiles – Paper – 01 – D

Patent

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D01D 5/11 (2006.01) D01D 1/06 (2006.01)

Patent

CA 2252743

An improved apparatus and process for flash-spinning plexifilamentary film- fibrils are provided in which a static mixing device (42) is provided in the conduit through which the polymer and spin agent are provided to the spin orifice (14) of the flash spinning apparatus. Preferably, the flash-spinning apparatus includes a chamber (16) immediately upstream of the spinning orifice (14) and the static mixing device (42) is disposed within the chamber (16). Plexifilamentary webs produced according to the invention have been found to have more densely spaced film-fibrils, more tie points and fewer holes. Bonded plexifilamentary sheets made from such webs have a more uniform thickness and a slightly higher tensile strength than sheets produced without the use of static mixers.

Cette invention concerne un appareil perfectionné, ainsi que le procédé correspondant, destiné au "flash-spinning" de fibrilles plexifilamenteuses obtenues par fibrillation d'un film, ledit appareil comportant un dispositif de malaxage statique (42) disposé dans le conduit à travers lequel le polymère et l'agent de filage sont amenés à l'orifice de filage (14) dudit appareil de "flash-spinning". De préférence, cet appareil de "flash-spinning" comporte une chambre (16) située immédiatement en amont de l'orifice de filage (14) et le dispositif de malaxage statique (42) est disposé à l'intérieur de la chambre (16). On a trouvé que les nappes plexifilamenteuses produites conformément à l'invention présentent une densité plus importante de fibrilles de film espacées, plus de points de liaison et moins de trous. Les feuilles plexifilamenteuses liées, fabriquées à partir de telles nappes, possèdent une épaisseur plus uniforme et une résistance à la traction légèrement supérieure que les feuilles fabriquées sans recours à des malaxeurs statiques.

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