Process for preparing slurry of novel core layer of coated duplex board with grey back

Abstract

A process for preparing slurry of a novel core layer of a coated duplex board with a grey back is disclosed. Raw materials for the core layer are produced by setting a sludge slurry production line, awood powder slurry production line, a wood fiber slurry production line and a core layer waste paper recovery device. Sludge accepts, wood powder accepts, wood fiber accepts, and core layer waste paper slurry are fully mixed according to a ratio of 5-7%:10-15%:10-15%:63-75% in a core layer slurry preparing pool of a paper machine to prepare the core layer, thus improving quality performance of the coated duplex board with a grey back and reducing the production cost of a paper mill.

Description

technical field [0001] The invention relates to a papermaking process, in particular to a novel coating process for preparing core layer slurry of gray bottom white board paper. Background technique [0002] Coated gray bottom whiteboard papermaking system includes surface layer flow system, lining layer flow system, bottom layer flow system and core layer flow system. The surface layer slurry is sent from MOW pulp or commercial bleached wood pulp pulp to the surface layer flow system for processing to form a surface layer, and the slurry in the DIP pulp tower is sent to the liner layer flow system to form a liner. ONP The slurry in the slurry tower is sent to the bottom flow system for processing to form the bottom layer, and the slurry in the MWP slurry tower and OCC slurry tower is sent to the core layer flow system for processing to form the core layer. The surface layer, lining layer, core layer and bottom layer are formed and then composited into cardboard. Among the...

AI Technical Summary

Problems solved by technology

[0003] However, there are still many defects in the process of making paper with waste paper in the traditional process, which leads to the fact that some quality and performance indicators of the gray-bottomed white board produced by the traditional process cannot meet the relevant requirements, especially in the current high price of waste paper. Due to the high production cost in the market environment, finding fiber raw materials that can replace waste paper is an important means for enterprises to reduce costs

The high cost of pulp for the core layer has affected the development of the enterprise, so there is an urgent need for a low-cost method for making the pulp for the core layer of coated white board paper

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