A drying process for paper and cardboard

Abstract

The invention belongs to a drying technology for paper and a paperboard. Processed soft water is conveyed into a pressure-bearing hot water boiler through a boiler water pump, the water inside the boiler is heated to be superheated water at the temperature ranging from 155 to 165, the superheated water is conveyed to a high temperature tower through a pipeline, the superheated water inside the high temperature tower is conveyed into hot press boards of a hot press through a circulating pump, a warm paperboard slab with the water content ranging from 60% to 80% is sandwiched between the hot press boards, the heat of the superheated water is absorbed, the moisture of the warm paperboard slab is evaporated, and the warm paperboard slab is changed into a dried paperboard with the water content ranging from 4% to 6%; low-temperature water with the temperature ranging from 120 to 140 discharged from the hot press boards of the hot press is conveyed back to the lower portion of the high temperature tower, the water at the lower portion of the high temperature tower is conveyed to the pressure-bearing hot water boiler again through the boiler water pump, therefore, the boiler water is heated to be the superheated water with the temperature ranging from 155 to 165 again, the superheated water is conveyed into the high temperature tower again through the pipeline, and the water is circulated. According to the drying technology, the quality of products is good, the energy resources are saved, and the pollution is reduced.

Description

[0001] Technical field: [0002] The invention is applicable to the drying process for producing industrial cardboard, civil cardboard and other papers, and is a drying process for paper and cardboard. [0003] Background technique: [0004] At present, the drying of cardboard and other products at home and abroad is mainly carried out by steam, heat transfer oil or electricity. Using these methods will not only affect the internal quality of the product, such as uneven drying of the product, but also affect the appearance quality of the product, such as surface carbonization. And deformation, etc.; and high energy consumption, heat transfer oil drying method will also be polluted by oil leakage, affecting the surrounding environment. [0005] The object of the present invention is to: make the water in the boiler directly turn into superheated water through the circulating pipe, and indirectly dry the wet paper base to obtain cardboard or paper products. [0006] This process...

AI Technical Summary

Problems solved by technology

[0004] At present, the drying of cardboard and other products at home and abroad is mainly carried out by steam, heat transfer oil or electricity. Using these methods will not only affect the internal quality of the product, such as uneven drying of the product, but also affect the appearance quality of the product, such as surface carbonization. And deformation, etc.; and high energy consumption, heat transfer oil drying method will also be polluted by oil leakage, affecting the surrounding environment

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