Filtration materials
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United States of America Patent
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-
Sep 21, 1999
Grant Date -
N/A
app pub date -
Mar 8, 1994
filing date -
Mar 12, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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