Tobacco smoke filter
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United States of America Patent
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Aug 15, 2017
Grant Date -
Feb 12, 2015
app pub date -
Feb 7, 2013
filing date -
Feb 8, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
The invention provides a method of producing a tobacco smoke filter or filter element comprising: • heat treating a continuously advancing longitudinally extending strand of material; • cooling the heat treated continuously advancing strand; and • forming a longitudinally extending outer layer of tobacco smoke filtering material around the continuously advancing strand, to form a continuously advancing rod comprising a longitudinally extending strand (1a) of material and a longitudinally extending outer layer (2a) of tobacco smoke filtering material engaged around the longitudinally extending strand (1a). An apparatus for carrying out the method, and products of the method, are also provided.
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