A papermaking wet end slurry system

Abstract

The invention discloses a pulp system for a papermaking wet end. The system comprises at least one pulp line, a fiber recovery machine and a pulp mixing tank, wherein the at least one pulp line at least comprises one first pulp line, the first pulp line is used for providing first fiber pulp of broadleaf wood bleached chemical pulp, the fiber recovery machine is connected with the first tail end of the first pulp line and used for recovering second fiber pulp separated from the first fiber pulp in the first pulp line, the pulp mixing tank is connected with the second tail end of the first pulp line and the tail end of the fiber recovery machine and used for mixing third fiber pulp separated from the first fiber pulp in the first pulp line with fourth fiber pulp recovered by the fiber recovery machine, and cation polymers are added to the second fiber pulp after the second fiber pulp is separated from the first fiber pulp in the first pulp line and before the second fiber pulp enters the fiber recovery machine. Accordingly, the interweaving performance of paper and peeling smoothness of cushion pulp can be improved, and paper strength is guaranteed.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a slurry system at the wet end of papermaking. Background technique [0002] When making paper with inter-wire paper machine, there are high requirements for wet paper web and paper strength. Because the pulp strength of softwood bleached chemical pulp (abbreviated as NBKP) is significantly higher than that of hardwood bleached chemical pulp (abbreviated as LBKP), in order to meet For the strength requirement of high-speed sandwich paper machine, it is generally used to add 10-30% NBKP to LBKP for copying. At the same time, due to the requirements of the ecological environment, the water cycle of the paper machine must be closed and operated. A large number of fiber components in the white water under the paper machine need to rely on NBKP with long fibers as the padding pulp of the multi-disc fiber recovery machine for fiber recovery. It is possible to reduce the loss of fi...

AI Technical Summary

Problems solved by technology

[0003] The fiber length of NBKP (2.0-2.2mm) is significantly higher than that of LBKP (0.7-0.8mm). The introduction of a large amount of NBKP will make the interweaving of paper worse. However, in the prior art, the use of NBKP or less often leads to the strength of paper. Insufficient, negative effects such as increased number of paper breaks

In addition, if LBKP is used to simply replace NBKP as the padding pulp, because the pulp strength and fiber length of LBKP are lower than NBKP, the wet strength of the padding pulp formed by the interlacing of fibers will be significantly weaker than when NBKP is used, resulting in its The discs of the disc fiber recovery machine cannot be peeled off smoothly one by one, which makes the water circulation operation of the wet end system difficult and cannot meet the overall needs of the operation

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