Coated white cardboard made of various fiber raw materials and production process of coated white cardboard

Abstract

The invention relates to a coating white cardboard made of various fiber raw materials and a production process thereof, the fiber raw materials of a core layer comprise bleached sulfate softwood pulp, bleached hardwood chemical thermo-mechanical pulp, white cardboard waste pulp and bagasse pulp, and the fiber raw materials of a bottom layer comprise bleached sulfate softwood pulp, bleached sulfate hardwood pulp and high-grade deinked pulp. An interlayer reinforcing agent is sprayed between the layers; the bagasse pulp can be chemically bleached mechanical pulp, and the interlayer enhancer comprises 40-75 parts of spraying starch, 10-20 parts of water-based novolac epoxy resin emulsion and 8-15 parts of styrene-acrylic emulsion; the retention and drainage aid in the slurry of the core layer and the bottom layer comprises PEI, CPAM and bentonite. According to the method, the problem of shortage of wood raw materials can be relieved, the cost is reduced, the defects of the strength, water resistance and the like of fiber pulp are overcome by spraying the interlayer reinforcing agent between layers, the finished pulp can have better water filtering performance and papermaking performance by chemically bleaching the mechanical bagasse pulp, and meanwhile, the strength performance of the finished paper is improved.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a coated white cardboard made of various fiber raw materials and a production process thereof. Background technique [0002] Coated white cardboard has a smooth surface, high whiteness and good strength, and is widely used in high-end packaging, advertising and other fields. The main raw materials of white cardboard are coniferous wood pulp, hardwood and chemical-mechanical pulp. The supply and demand of these raw materials directly affect the price trend of white cardboard. When these wood pulp raw materials are in a state of tight supply and demand, seek other types of fiber raw materials It is particularly urgent to replace some wood pulp raw materials. Office waste paper / magazine paper deinked pulp is waste paper pulp, and bagasse pulp is a non-wood fiber raw material, both of which are excellent raw materials for papermaking. For a long time, bagasse pulp ha...

AI Technical Summary

Problems solved by technology

Office waste paper / magazine paper deinked pulp is waste paper pulp, and bagasse pulp is a non-wood fiber raw material, both of which are excellent raw materials for papermaking. For a long time, bagasse pulp has been used to make various cultural papers and household papers, while chemical bagasse pulp The paper made from pulp has low opacity and bulk, poor paper strength, and poor water filtration performance during the papermaking process, so it is difficult to be used for other paper types.

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