Cooking process for compound modification of cotton paper pulp, natural color bamboo paper pulp and natural color wood paper pulp into dissolving pulp

Abstract

The present invention discloses a cooking process for compound modification of a cotton paper pulp, a natural color bamboo paper pulp and a natural color wood paper pulp into a dissolving pulp. The cooking process comprises two cooking, wherein the first cooking is used for separately cooking the cotton paper pulp after material preparing, the second cooking is used for cooking the compound paper pulp of the cotton paper pulp being subjected to the first cooking, the natural color bamboo paper pulp after material preparing, and the natural color wood paper pulp after material preparing, the second cooking adopts a continuous cooking device to cook, the continuous steaming pipe of the continuous cooking device is arranged into three sections, the one section connected with a pre-reacting material bin is provided with a T-shaped pipe for adding an alkali liquid and a steam pipe for adding steam, and other two sections are respectively provided with a steam pipe for adding steam. According to the present invention, the raw materials adopt the cotton paper pulp, the natural color bamboo paper pulp and the natural color wood paper pulp, such that the dissolving pulp preparing cost is substantially reduced, the quality requirements of the dissolving pulp for viscose fibers are met, and the performance is diverse.

Description

technical field [0001] The present invention relates to a method for compound modification of cotton and uncolored wood pulp into dissolving pulp, in particular to a method for compound modification of cotton, uncolored bamboo pulp and uncolored wood pulp into dissolving pulp, wherein 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 method and th...

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