Wastepaper deinking process
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United States of America Patent
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Jul 13, 1993
Grant Date -
N/A
app pub date -
Jul 31, 1991
filing date -
Jul 31, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention therefore relates to a process for the deinking of wastepaper stocks which comprises: a) converting the wastepaper to a pulp and contacting said pulp with an aqueous medium of alkaline pH containing a surface active deinking agent, and b) subjecting the resulting pulp-containing medium to one or more flotation steps wherein said final flotation step is carried out at a pH of less than about 7 to remove suspended ink therefrom and to condition said pulp-containing medium for subsequent addition to a paper machine.
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Cited Art Landscape
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