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Method for preparing bleached chemi-mechanical pulp fore culture paper making by using cotton wood to process remainder

A technology for processing residues and cultural paper, which is applied in the field of bleached mechanical pulp, can solve the problems of serious pollution and low utilization rate of raw materials, and achieve the effects of high utilization rate of raw materials, compact equipment and low investment

Active Publication Date: 2009-12-30
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low raw material utilization rate and serious pollution in the pulping technology of poplar wood processing residues in the existing technology, and provide a kind of bleached mechanical pulp for making cultural paper by using poplar wood processing residues. The method is to fully adopt domestic equipment to realize the method of cleanly and efficiently producing bleached mechanical pulp for cultural paper blending by using poplar wood processing residues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The residues of poplar wood processing are first crushed and evened, then screened, washed, soaked in water for 10-12 hours, and then steamed at 100-105℃ for 15 minutes at atmospheric pressure. The steamed wood chips use a compression ratio of 4-6:1 The (volume ratio) twin-screw extruder performs squeezing and tearing, and the material after squeezing and tearing is chemically impregnated with alkaline hydrogen peroxide solution. The impregnation conditions are: the amount of hydrogen peroxide 2.0% (for absolutely dry materials), the amount of sodium hydroxide 2.0% (for absolutely dry materials), the amount of DTPA 0.3% (for absolutely dry materials), and the amount of sodium silicate 1.0% (for absolutely dry materials) Dry material), the amount of magnesium sulfate 0.05% (for the absolutely dry material), the impregnation slurry is thick (the weight of the absolute dry material accounts for the total weight of the wet material) 40%, the immersion temperature is 50℃, and th...

Embodiment 2

[0023] The residues of poplar wood processing are crushed first, then screened, washed, soaked in water for 10-12 hours, and then steamed at 100-105℃ for 15 minutes at atmospheric pressure. The steamed wood chips are compressed with a compression ratio of 4-6:1 ( Volume ratio) twin-screw extruder for squeezing and tearing, and the material after squeezing and tearing is chemically impregnated with alkaline hydrogen peroxide solution. The impregnation conditions are: the amount of hydrogen peroxide 2.0% (for absolutely dry materials), the amount of sodium hydroxide 2.0% (for absolutely dry materials), the amount of DTPA 0.3% (for absolutely dry materials), and the amount of sodium silicate 1.0% (for absolutely dry materials). Dry material), the amount of magnesium sulfate 0.05% (for absolutely dry materials), the impregnation slurry is thick (the weight of the absolute dry materials accounts for the total weight of the wet materials) 40%, the impregnation temperature is 50℃, and th...

Embodiment 3

[0025] A method of using poplar wood processing residues to prepare bleached chemical pulp for cultural paper blending. The steps are as follows:

[0026] The first step is to prepare raw materials: first crush the poplar wood processing residue, then screen and wash, and soak the washed wood chips for 4-12 hours;

[0027] The second step, pre-steaming: the materials processed in the first step are pre-steamed at 1 atmosphere pressure and 100-105°C for 30 minutes;

[0028] The third step, screw extrusion: a twin-screw extruder is used to squeeze and tear the materials processed in the second step;

[0029] The fourth step, chemical impregnation: chemically treat the materials processed in the third step with alkaline hydrogen peroxide solution, the treatment conditions are: the amount of hydrogen peroxide is 4% of the mass of the absolute dry material, and the amount of sodium hydroxide is the absolute dry 4% of the mass of the material, the amount of metal ion chelating agent is ...

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Abstract

The invention discloses a method for preparing bleached chemi-mechanical pulp fore culture paper making by using cotton wood to process remainder, which belongs to the field of pulp refining for making paper. The method mainly comprises presteaming, double screw extrusion, chemical impregnation, high-consistency pulp refining by a double-screw fiberizer, adding medicament in the pulp refining process, high-consistency stay, middle-consistency pulp refining and other steps. The pulp refining process adopts single-section double-screw extrusion and single-section alkaline hydrogen peroxide impregnation, has simple process flow and compact equipment, completely adopts home equipment and saves the investment. The chemi-mechanical pulp prepared by processing cotton wood remainder through the method has the characteristics of high bulk, strength, whiteness and the like, and is suitable for pulp to be used for paper making of medium-high grade culture paper. The method achieves the cleanness and high-efficiency utilization of the remainder of the cotton wood processing factories, and is suitable for medium-small paper making enterprises for producing culture paper dependent on outsourcing goods.

Description

Technical field [0001] The invention belongs to the technical field of chemical-mechanical pulping, and particularly relates to a process for preparing bleached chemical mechanical pulp for cultural paper blending by using poplar wood processing residues. Background technique [0002] my country is a big producer and consumer of paper and paperboard, and both the production and consumption of paper and paperboard rank second in the world. However, my country is also a country with severe shortage of wood fiber resources. For a long time, due to the lack of wood pulp, the quality of paper, cardboard and paper products in my country is low, structural contradictions are prominent, the supply of low-grade paper is oversupply, and the supply and demand gap of high-grade paper is large. Some high-grade cultural paper, high-grade packaging paper and paper Products have to rely heavily on imports, and a large amount of commercial wood pulp must be imported from abroad every year. Since ...

Claims

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Application Information

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IPC IPC(8): D21H11/02D21B1/04D21C1/02D21C1/10D21C3/02D21C9/16D21H17/66D21D1/34D21H17/14
Inventor 邓拥军房桂干韩善明焦健李红斌李萍
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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