Manufacture of multilayer polymer films

Details Manufacture of multilayer polymer films Manufacture of multilayer polymer films

B - Operations, Transporting

29

C

B29C 65/02 (2006.01) B29C 59/04 (2006.01) B29C 65/00 (2006.01)

Patent

CA 2263606

A method for making multilayer polymer films (9) which involves the use of preferably embossed rollers (5, 6) which oscillate oppositely with respect to each along their respective rotational axis. Multilayer film is made by passing two or more molten thermoplastic films (3, 36) through the nip of these rollers, thereby laminating the individual films together. The method is particularly useful for improving the adhesion between film layers, and/or when at least one of the layer is a liquid crystalline polymer. Such films are useful in packaging, multilayer containers and for circuit boards.

La présente invention concerne un procédé de fabrication de films polymères multicouches qui consiste en l'utilisation de rouleaux à bossage tournant en sens opposé l'un par rapport à l'autre autour de leur axe de rotation respectif. On fabrique un tel film multicouche en faisant passer deux films thermoplastiques ou plus en fusion à travers l'espacement compris entre lesdits rouleaux, formant ainsi un ensemble stratifié à partir des deux films individuels. Ce procédé se révèle particulièrement utile pour l'amélioration de l'adhésion entre les couches de film, surtout si au moins l'une des couches est un polymère cristallin liquide. De tels films sont d'un usage courant pour les emballages, les récipients à plusieurs couches et les cartes de circuits imprimés.

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