Processing wastepaper containing waxes, hot melts and adhesives
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United States of America Patent
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Jan 13, 1998
Issued Date -
N/A
app pub date -
Jan 24, 1997
filing date -
May 26, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of processing recycled paper which contains such a high amount of wax, hot melts or stickies that they would be expected to cause a stoppage of the paper-manufacturing machine. The paper to be recycled is pulped in a pulper and passed on to respective subsequent stages which include a despecker, grader and hydrocyclone. Pulping takes place at a temperature of at least 60.degree. C., and at the same time subjects the paper to a high shear action. The processing line includes a pulp-thickening stage, preferably after the processing stages mentioned, in order to separate off a very high proportion of the wax, hot melts and stickies finely dispersed in the pulper.
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