Method of making adhesive-free bonded porous thermoplastic nibs for markers and highlighter applications
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United States of America Patent
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Apr 4, 2006
Grant Date -
Mar 18, 2004
app pub date -
Jan 8, 2003
filing date -
Jan 8, 2002
priority date (Note) -
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Abstract
A method and an apparatus are described for making porous thermoplastic nibs which are adhesive-free and plasticizer-free. The method comprises the steps of feeding a coherent fibrous structure into a compacting, shaping and bonding die, heating the surface of the fibers uniformly by surrounding them with a hot fluid and causing their surfaces to become tacky and to develop a cohesive bond between the fibers.
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