Process of producing biodegradable sheet formed of cellulose and chitosan
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United States of America Patent
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Oct 13, 1992
Grant Date -
N/A
app pub date -
Aug 13, 1991
filing date -
Aug 22, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A biodegradable sheet is produced from an aqueous dispersion containing finely cut cellulose fibers and chitosan. The dispersion is maintained at a temperature T.sub.1 .degree.C. which is within the following range: t.ltoreq.T.sub.1 .ltoreq.t+30 wherein t is the boiling point (.degree.C.) of water at a given reduced pressure and is continuously introduced into a defoaming zone maintained at the given reduced pressure and at a temperature within the same range as that of T.sub.1. In the defoaming zone, the dispersion is formed into a downwardly flowing laminar flow so that air entrapped therein is effectively removed therefrom. The defoamed dispersion is then passed through a die and is molded into a sheet which is subsequently dried.
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