The hottest raw material of corrugated board

2022-08-14
  • Detail

Raw materials of corrugated board (Part 1)

tree paper and paper paddles can be made of a variety of plant fibers, but trees and non wood are the most used raw materials of paper

chemical composition of wood

the following table shows the typical chemical composition of coniferous and hardwood. However, it is difficult to accurately write the chemical molecular formula of wood, because wood is a complex and uneven natural product composed of a variety of molecular formula compounds. The main components of wood are cellulose (%), hemicellulose (%), wood (%) and substances dissolved in solvents (.5%). However, it is impossible to sort out these chemical components without structural changes and decomposition. If we study the main components of wood such as 000, then most of it is composed of polysaccharides, accounting for about%; If the polysaccharide of wood is decomposed with dilute acid and water, it can be known that it is a high molecular carbohydrate composed of glucose, mannose, xylose and other monosaccharides

the main polysaccharide components of wood can be divided into cellulose, total cellulose and hemicellulose. If the total cellulose is treated with dilute alkali (such as 17.5% NaOH or% KOH) at room temperature, then% dissolved in wood is hemicellulose and% insoluble is cellulose

pulp

the raw material of paper is pulp, which is mainly made of wood. Its manufacturing methods are generally as follows: chemical pulp, pulp, semi chemical pulp, mechanical (physical) pulp

1, chemical pulp

242 tempered and semi tempered glass chemical pulp are pulp made mainly of chemicals in the process of manufacturing pulp. Of course, according to the drugs used and manufacturing methods, There are also certain differences in the indicators of material control. In addition to the advantages of the torsion testing machine with piezoelectric load sensor, the intermediate lignin in the raw material has the disadvantages of low raw material utilization and high production cost compared with the process pulp with cellular lignin

(1) kraft pulp

kraft pulp is a kind of pulp made by chemical methods, also known as sulfate pulp. Kraft means strong in Sweden. Because the paper made from the pulp made from mirabilite, a by-product of Swedish chemical factory, is very strong, it is called kraft paper

(2) semi chemical pulp

semi chemical pulp is a kind of pulp made by using chemical treatment method, first removing part of the lignin contained in the wood, and then mechanically crushing the remaining softened wood chips. In other words, chemical treatment and mechanical treatment account for half of the manufacturing methods. The purity and strength of semi chemical pulp are higher than that of wood pulp, i.e. mechanically treated pulp, and the yield is higher than that of chemical pulp made by chemical method

2. Waste paper pulp

the so-called waste paper pulp is the used waste paper, which is put into the dredging machine device like the juice blender and twisted back and forth to decompose the mutually condensed fibers into porridge

the waste pulp used for the surface and bottom pulp of corrugated board is mainly made of kraft paper and corrugated paper scraps, so its strength is very high

Copyright © 2011 JIN SHI