Process for treating paper pulp
AssigneeVinings Industries, Inc.
InventorsRoderick Donald Raslack, Charles Theodore Gammon, Reginald James Christmas
Life of this patent
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Abstract
Disclosed is a process for washing or otherwise treating paper pulp. More specifically, a multi-stage paper pulp washing process including the use of a defoamer/emulsifier mixture which is adjusted at a paper manufacturing site for each stage. The same defoamer may be used in each washing stage. However, solubility is adjusted at the paper manufacturing site by adding a small amount of emulsifier to the defoamer as appropriate for the particular stage.
Claims13
A process for treating paper pulp at a paper manufacturing site, comprising the steps of:
- feeding paper pulp into a cleaning device comprising at least two washing stages;
- producing a first mixture at the manufacturing site comprising a defoamer;
- feeding the first mixture into a first washing stage;
- producing a second mixture at the manufacturing site comprising an emulsifier, the second mixture having a weight ratio of emulsifier to defoamer that is greater than the weight ratio of emulsifier to defoamer in the first mixture;
- feeding the second mixture into a second washing stage, the second washing stage being downstream from the first washing stage relative to the direction of paper pulp travel;
- and
- adjusting the weight ratio of emulsifier to defoamer in the first mixture or second mixture.
A process for treating paper pulp at a paper manufacturing site, comprising the steps of:
- feeding paper pulp into a cleaning device comprising at least two washing stages, said cleaning device including a washing fluid that passes through the washing stages countercurrent to the direction of paper pulp travel;
- producing a mixture at the manufacturing site comprising at least one of a defoamer and an emulsifier for each of the washing stages, each of the mixtures having a different weight ratio of emulsifier to defoamer;
- feeding the mixtures to each of said washing stages such that the weight ratio of emulsifier to defoamer increases from one washing stage to the next washing stage relative to the direction of paper pulp travel;
- and
- adjusting the weight ratio of emulsifier to defoamer in at least one mixture.
A process for treating paper pulp at a paper manufacturing site, comprising the steps of:
- feeding paper pulp into a cleaning device comprising at least two washing stages;
- producing a mixture at the manufacturing site comprising at least one of a defoamer and an emulsifier for each of the washing stages;
- feeding the mixtures to each of said washing stages;
- and
- adjusting the weight ratio of emulsifier to defoamer in at least one mixture.
Dependencies are inferred from the claim text.