Sheet material and method and apparatus for drying therefor
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United States of America Patent
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Feb 24, 2004
Grant Date -
Jan 30, 2003
app pub date -
Jun 6, 2002
filing date -
Jul 27, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sheet material, a production method therefor and a drying apparatus is provided wherein a heating gas comprising mainly superheated steam is blown directly to reach the sheet internal water content via a permeable belt for restricting free shrinkage of the sheet, to give instantaneous evaporation (pressure flow) and form a porous sheet. A wet sheet 35 is clamped between an externally heated rotor 1 having heated gas blowing ports 19 for blowing heated gas from an outer peripheral direction, and a permeable endless fabric belt 36 which moves in synchronous with the rotor under a tension capable of restraining dry shrinkage of the sheet material, to thereby give rapid direct moisture evaporation and form a porous sheet.
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