Filtration materials

A - Human Necessities – 24 – D

Patent

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A24D 3/14 (2006.01) A24D 3/06 (2006.01) A24D 3/08 (2006.01) A24D 3/16 (2006.01) B01D 39/04 (2006.01)

Patent

CA 2117153

An extruded filtration material which is degradable and comprises either a plastics material or an inorganic material having a melting point above the operating temperature, a polysaccharide expansion medium, a binder and water. These ingredients are fed to an extruder and subjected to an extrusion process which involves a pressure reduction, upon extrusion from the exit die, of up to about 70 bars so that swelling of the extrudate occurs to give a cellular structure. When exposed to the natural weather conditions, tobacco smoke filter elements comprising such material degrade without leaving a fused amalgamation of plastics or inorganic material.

Matériau filtrant extrudé dégradable comprenant soit une matière plastique soit une matière inorganique dont le point de fusion est au-dessus de la température d'utilisation, un agent d'expansion du polysaccharide, un liant et de l'eau. Ces ingrédients sont envoyés à une extrudeuse et soumis à un procédé d'extrusion qui comporte une diminution de la pression, lors de l'extrusion par la matrice, allant jusqu'à 70 bars pour qu'il y ait gonflement de l'extrudat pour obtenir une structure cellulaire. Lorsqu'ils sont exposés aux conditions atmosphériques, les éléments du filtre de la fumée de tabac comprenant un tel matériau se dégradent sans laisser d'accumulation fusionnée constituée de plastique ou de matière inorganique.

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