Method and apparatus to produce paper webs coated on both sides
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United States of America Patent
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-
Jul 29, 2003
Grant Date -
May 23, 2002
app pub date -
Aug 28, 2001
filing date -
Feb 10, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of producing paper webs coated on both sides includes the following steps: a) indirectly applying a liquid onto the paper web by passing the web through at least one nip formed by a roll and a counterelement, whereafter the web is dried; b) next, directly applying coating mixture at surplus only on one side of the web, whereafter the surplus coating mixture is removed again by use of a doctor element, the web being dried again thereafter; and c) lastly, directly applying coating mixture at surplus only on the other web side, whereafter the surplus coating mixture is removed by use of a doctor, whereafter the web is dried again. In the indirect application of liquid in the nip, or in the nips, either coating mixture to produce so-called MWC papers or a sizing suspension to produce so-called LWC papers is selectively applied.
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