Method for preparing mixed papermaking pulp from cotton velvet and waste boxboard paper

Abstract

The invention discloses a method for preparing mixed papermaking pulp from cotton velvet and waste boxboard paper. The method comprises a waste boxboard paper pulping step, a cotton velvet pulping step, a primary pulp blending step, a graded screening step, a first primary pulp treatment step, a second primary pulp treatment step and a secondary pulp blending step; the cotton velvet pulping step comprises a crushing substep, a disc mill defibering substep and an impurity removing substep. According to the method disclosed by the invention, after the cotton velvet is treated, the cotton velvetand the waste boxboard paper are mixed and used for papermaking, the content of organic substances including lignin, starch and the like in pulping white water can be reduced, anionic garbage in a white water system is reduced and the COD (Chemical Oxygen Demand) for workshop drainage is reduced, so that the sewage load is alleviated and the environment is protected; compared with paper sheets produced by a traditional technology, paper sheets produced by the method disclosed by the invention have the advantages that the cleanliness of paper surfaces is improved, the paper surface is smooth and the tactility of the paper surface is good; the cotton velvet is added so that the tightness of the produced paper is increased and the strength of the paper sheets is also improved, and furthermore, the quality of the paper sheets is improved.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a method for making mixed papermaking slurry by using earth wool and waste cardboard paper. Background technique [0002] As a kind of leftovers from cotton spinning mills, earth velvet is mostly yellowish in color. Due to more impurities and shorter fibers, it is generally used for molding egg trays and seedling drags, etc., but the market for these products is small; in addition, many cotton Plants and cotton seed processing units discard the velvet, causing environmental pollution and waste of resources. In modern production, the technology of using waste containerboard paper for papermaking is relatively common, but the resources of waste containerboard paper are in short supply, and the quantity of earth velvet is large and the price is low, and the cellulose content in earth velvet is relatively high, which is a suitable raw material for papermaking. [000...

AI Technical Summary

Problems solved by technology

[0003] At present, soil wool is mainly used in the pulp molding industry, and has not been widely used in the paper industry. The application of soil wool in the paper industry can alleviate the shortage of waste paper resources. However, soil wool has the problems of poor dispersion and many impurities. , so use papermaking technology to make rational use of soil wool

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