Cooking process for carrying out composite modification on natural color bamboo paper pulp and natural color wood pulp to form dissolving pulp

Abstract

The invention discloses a cooking process for carrying out composite modification on natural color bamboo paper pulp and natural color wood pulp to form dissolving pulp. Composite paper pulp is fed into a continuous digester to be cooked; a continuous steaming pipe of the continuous digester is provided with three sections; the section connected with a pre-reaction bin is provided with a T-shaped pipe for adding alkali liquor and a steam pipe for adding steam; the other two sections are provided with steam pipes for adding the steam; the liquor ratio is 1:(2.0 to 4.0); the alkali liquor is NaOH and Na2SO3 and is added according to 17 percent to 30 percent of the oven dry weight; and the compression ratio is 1:(2 to 3.0). According to the invention, the natural color bamboo paper pulp and the natural color wood pulp are used as the raw materials, so that the cost of preparing the dissolving pulp is reduced to a great extent and the quality requirement of the dissolving pulp for viscose is also met.

Description

technical field [0001] The present invention relates to a method for compound modification of natural bamboo pulp and natural wood pulp into dissolving pulp, in particular to a method for compound modification of natural color bamboo pulp and natural wood pulp into dissolving pulp, wherein the dissolving pulp refers to pulp for viscose fiber Meal, cellulose and cellulose derivatives. Background technique [0002] The application number is 200710050470.9, the authorized announcement number is CN101158125, and the authorized announcement date is April 9, 2008. The Chinese invention patent discloses a paper-making grade coniferous wood pulp board modification process, wherein the cooking process uses paper-making grade wood pulp board Use caustic soda method, sulfate method or sulfite method for cooking, and the cooking agents are NaOH, NaOH+Na 2 S, Na 2 SO 3 + NaOH, the process conditions are: 1. The total alkali concentration of the cooking liquid by the caustic soda meth...

AI Technical Summary

Problems solved by technology

But the bamboo pulp prepared by this invention has the following disadvantages: 1, the yield is low, and the highest yield is only 85%

2. The α-cellulose content fluctuates greatly, from 85% to 95%, which makes the modified bamboo pulp α-cellulose content unstable

3. The average length of fibers is lower than that of paper-making wood fibers, and the content of ash and polypentose in the production process is high, and the bamboo fibers are hard, have more thick-walled fibers, narrow cell lumens, dense fiber tissues, and the presence of air in the cells leads to dissolution Difficult, large amount of chemicals

4. The viscose fiber produced by a single bamboo pulp has monotonous performance and does not show individuality

But this invention is only applicable to the modification of cotton linters and is prepared into viscose fiber. If the composite material is modified by the method provided by the invention to prepare dissolving pulp, the quality index of the modified dissolving pulp cannot reach that of dissolving pulp. Requirements, and high energy consumption, low yield

[0007] To sum up, the above-mentioned invention patents mainly have the following disadvantages: 1. The raw material is single, and the dissolving pulp produced has single performance and does not show individuality

2. A single raw material has its own disadvantages, such as high production cost, low yield, and unstable product quality

3. Outdated production equipment, high energy consumption, and uneven cooking