Method for producing low basis weight newsprint by 100 percent deinking waste pulp added with retention and drainage agent

Abstract

The invention discloses a preparation method for low basis weight newsprint by using 100% de-inking waste paper pulp added with retention and filter aid, which comprises a plurality of steps: add 100% de-inking waste paper pulp into a proportioning tank of a high-speed paper machine; then add calcium carbonate and fixing cation modified polyamines; add starch at the entrance of a machine chest; use tray water to flush the pulp at the outlet of the machine chest; control the wite pulp concentration at 1.0%; after desanding and deaerating, add the retention aid cation water soluble macromolecule polyacrylamide derivative at the outlet of a sizing pump and the inlet of a vertical screen; add filter aid polyethylenimine at the outlet of the vertical screen; the pulp is sent into a head box ofthe high-speed paper machine; thus, the low basis weight newsprint can be produced. The preparation method for low basis weight newsprint by using 100% de-inking waste paper pulp added with retentionand filter aid has the advantages that by adopting 100% de-inking waste paper pulp, the preparation method saves fiber material for making paper on the basis of changing the material structure of thenewsprint, greatly reducing the consumption of timber, water and electricity and the emission of pollutant, relieving the environmental pollution and lowering the production cost.

Description

technical field [0001] The invention belongs to the field of environmental protection and resource utilization, in particular to a method for producing low-quantity newsprint by adding retention and drainage aids to 100% deinked waste paper pulp (DIP). Background technique [0002] Low-weight newsprint is an international high-end product, especially when 100% deinked waste newsprint pulp (DIP) is used to produce low-weight newsprint on a high-speed paper machine, it is necessary to add retention and drainage aids to prevent the loss of fine fibers and fillers in the pulp; Reduce the concentration of white water under the wire, increase the dryness entering the press section, reduce the steam consumption in the drying section, increase the drainage rate of pulp, and adapt to the operation of high-speed paper machines. [0003] At present, the usual weight of newsprint produced on a high-speed paper machine using 100% deinked waste newsprint is 47-49g / m 2 , the existing tec...

AI Technical Summary

Problems solved by technology

[0003]At present, the newsprint produced on the high-speed paper machine using 100% deinked waste newsprint is usually 47~49g / m2 sup>, the existing technology can only use 85% deinked waste paper pulp (DIP), 15% wood chip groundwood pulp (TMP) to produce 47 ~ 49g / m2 newsprint; or use 100% deinked waste paper pulp (DIP) produces 47-49g / m2 newsprint; if low-quantity newsprint is produced, the indicators such as opacity, tensile index and tear index often cannot be reached Quality Standard Requirements

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