Method of producing high-strength polyolefin ribbons,...

B - Operations – Transporting – 29 – C

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B29C 55/06 (2006.01) D01D 5/42 (2006.01) F41H 5/04 (2006.01)

Patent

CA 2683908

The invention relates to a method for the production of high-strength ribbons having a high modulus of elasticity made of a highly molecular polyolefin, wherein the polyolefins, particularly polypropylene and polyethylene, are extruded through a slotted nozzle, are then subjected to a temperature of 85° to 135 °C for a duration of at least one second, the films are then cut into individual ribbons, if necessary, and stretched at temperatures between 90° to 165 °C in one or more steps, are rolled up or further processed directly into textiles or technical flexible sheet materials. The ribbons can be laminated into multi-layer flexible sheet materials by using adhesives or adhesion promoters, the flexible sheet materials being particularly suitable as protection from ballistic projectiles. In this case particularly in the form of plate-shaped or flexible compound bodies.

L'invention concerne un procédé de fabrication de bandes à haute résistance et haut module d'élasticité en polyoléfine à haut poids moléculaire. Les polyoléfines sont en particulier le polypropylène et le polyéthylène et sont extrudées par une filière à fente, sont ensuite exposées pendant une durée d'au moins une seconde à une température de 85° à 135°C, les films sont ensuite éventuellement découpés en bandes individuelles, étirés à une température comprise entre 90° et 165°C en une ou plusieurs étapes et enroulés ou directement transformés en produits plats textiles ou techniques. En recourant à des adhésives ou des agents promoteurs de l'adhérence, les bandes peuvent être converties par laminage en produits plats multicouches qui conviennent en particulier comme protection contre les projectiles ballistiques et en particulier sous la forme de corps composites en forme de plaque ou flexibles.

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