Removing method of white spots on paper surfaces in paper production

Abstract

The invention discloses a method for removing white spots on paper surface in paper production. A dispersant is added to a medium-concentration standpipe for producing paper to form a slurry with white spot dispersant, which is then sent to pulp tower I for standby. When white spots appear on the paper surface, switch the bypass immediately, use the slurry with white spot dispersant in pulp tower I, and then mix the problematic pulp without dispersant in pulp tower II according to a certain amount. Into the slurry that adds dispersant in slurry column I. In the process of paper production, the present invention uses a dispersant to disperse the coating of the coated paper into colloidal particles when white spots appear on the paper surface, thereby achieving the purpose of being invisible to the naked eye, effectively removing the white spots on the paper surface, and treating White spots that cannot be handled by physical equipment are eliminated.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for removing white spots on paper surface during paper production. Background technique [0002] Waste paper is a recyclable resource that is discarded after use in production and life, including various high-grade paper, yellow cardboard, waste cartons, edge-cut paper, packing paper, paper for enterprises and units, engineering paper, books, periodicals, newspapers, etc. Wait. Internationally, waste paper is generally divided into three types: European waste, American waste and Japanese waste. The raw materials of paper are mainly plant fibers such as wood, grass, reed, bamboo, etc. Waste paper is also called "secondary fiber", and the main purpose is to reuse fiber to produce recycled paper products. However, in the production process, due to the inclusion of a large amount of coated paper in the waste paper, although the coating of the coated paper has been proc...

AI Technical Summary

Problems solved by technology

However, in the production process, due to the inclusion of a large amount of coated paper in the waste paper, although the coating of the coated paper has been processed in various steps of pulping, there are still white pulp lumps visible to the naked eye, which are fillers or Starch and white fibers are not fully dispersed, which makes the paper surface of the produced paper appear different degrees of white spots, especially for machines with only one pulp line, the amount of defective products is relatively large