Method for preparing a biodegradable filter material

A - Human Necessities – 24 – D

Patent

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A24D 3/08 (2006.01)

Patent

CA 2233368

The invention concerns a biodegradable filter tow or filter material (1) of renewable raw materials for use as tobacco filter elements for cigarettes, cigars or pipes, as well as a process for its manufacture. Fibres, foils or foams produced in an extrusion process and consisting of biopolymers based on thermoplastic starch and their polymer mixture are processed to form the filter tow or filter material according to the invention. The advantages of the invention reside in the use of biodegradability of the natural biopolymer filter material, a pollutant-reducing aroma-enhancing filter effect and an economical manufacturing method.

L'invention concerne une étoupe ou un matériau de filtre (1) réalisés à partir de matières premières renouvelables, destinés à être utilisés comme éléments de filtres de tabac dans les cigarettes, les cigares ou les pipes. L'invention concerne également un procédé de fabrication correspondant, selon lequel des fibres, des feuilles ou des mousses en biopolymères fabriqués selon un procédé d'extrusion à base d'amidon thermoplastique et leurs mélanges de polymères, sont transformés pour constituer les étoupes et matériaux destinés aux filtres de l'invention. Les avantages de l'invention résident dans l'utilisation essentielle de matières premières renouvelables, dans la biodégradabilité rapide et complète du matériau en biopolymère naturel utilisé pour le filtre, dans l'effet filtrant qui réduit les polluants et accentue l'arôme et dans un procédé de fabrication économique.

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