Filter plug
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United States of America Patent
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-
Dec 18, 1984
Grant Date -
N/A
app pub date -
Apr 29, 1982
filing date -
Apr 29, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filter plug having a dual structure comprising filter element A made from a crimped long filter tow in a form of a plug, filter element B, joined to said A, prepared by wrapping a core material consisting of a long fiber tow in a sheet-formed product having grooves which is formed from a material having an air permeability of 8 liters/minute or less and an air permeable wrapping paper and/or a wrapping paper with perforated openings on its periphery which is wrapping therein said filter elements A and B so that the outer grooves parts of the sheet-formed product pass through in the longer direction of the filter plug.
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