Method of optimizing the metering of charge-reversal agent into paper broke
AssigneeNordland Papier AG
InventorJoachim Jörn
Life of this patent
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Abstract
The method of optimizing the metering of charge-reversal agent into broke in the form of a suspension of fibers from paper treated in a coating machine and to be reintroduced into the production line, is distinguished by the fact that a partial stream is branched off from the main broke flow, the volume flow of the main stream and of the partial stream is measured, the turbidity of the partial stream is determined, downstream thereof the charge-reversal agent is added in a quantity that varies with time and, following that, the turbidity is again measured, in that the optimal metering rate is determined from the change in turbidity caused by the charge-reversal agent, and the said metering is carried out in the main stream in proportion to the mass or volume flows.
Claims8
A method of optimizing the metering of a charge-reversal agent into a broke stream comprising:
- branching off a partial broke stream from a main broke flow, wherein the main broke flow comprises an aqueous suspension of fibers from paper treated in a coating machine and to be reintroduced into the production line;
- measuring the volume of flow of the main broke flow;
- measuring the volume of flow of the partial broke stream;
- measuring a first turbidity of the partial broke stream;
- adding a charge-reversal agent to the partial broke stream at an addition rate that varies over time;
- measuring a second turbidity of the partial broke stream;
- determining an optimal charge-reversal agent metering rate for the partial broke stream, wherein the optimal charge reversal agent metering rate is a function of the difference between the first turbidity and the second turbidity;
- determining an optimal charge-reversal agent metering rate for the main broke flow by multiplying the optimal charge-reversal agent metering rate for the partial broke stream by the ratio of the volume of flow of the main broke flow to the volume of flow of the partial broke stream;
- and
- metering, a charge-reversal agent into the main broke flow at the optimal charge-reversal agent metering rate determined for the main broke flow.
Dependencies are inferred from the claim text.