Patent ID: 6273999
Filing Date: 2001-08-14
Classification: D21C,D21H,Y02W

Abstract:
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; andmetering, a charge-reversal agent into the main broke flow at the optimal charge-reversal agent metering rate determined for the main broke flow.