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Chemithermomechanical pulp, method for enhancing strength thereof, and paper manufactured thereby

A technology of chemical-mechanical pulp and mechanical pulp, applied in the direction of chemical/chemical-mechanical pulp, addition of inorganic compounds, addition of paper forming aids, etc., can solve problems such as poor flexibility, weakened fiber bonding force, and high fiber stiffness, and achieve folding resistance The degree of improvement is obvious, the proportion of addition is increased, and the effect of reducing production costs

Active Publication Date: 2014-04-23
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the pulping process of chemical-mechanical pulp, wood chip raw materials are only slightly chemically treated, and the temperature in the impregnation section does not reach the melting point of lignin, and the bleaching method in the bleaching section is lignin-retaining bleaching, so the wood in chemical-mechanical pulp The lignin is basically not removed, and the surface of the fiber is covered with a layer of lignin. The presence of lignin molecules hinders the water absorption and swelling of the pulp fiber and the fibrillation, thereby weakening the bonding force between the fibers, resulting in the pulp High fiber stiffness and poor flexibility limit the improvement of pulp strength to a large extent, and ultimately limit the wide use of chemical-mechanical pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material for APMP pulping is 80% poplar + 20% pine; the pulp to be treated is semi-dry pulp produced by pulping line, with a concentration of 40%; the bridging agent is borax, and the addition amount is 50kg / t pulp; the addition amount of starch is 60kg / t slurry. Take the semi-dry slurry with a concentration of 40%, first add the bridging agent solution, fully mix the slurry and the bridging agent, then add the starch solution and mix the slurry and the starch evenly. This example is a laboratory example.

Embodiment 2

[0038] The raw material for APMP pulping is 80% poplar + 20% pine; the pulp to be treated is the multi-disc thickener pulp obtained from the pulping line (initial concentration is 10%, diluted with water to 1% for later use); the bridging agent is Borax, added in an amount of 1kg / t pulp; starch added in an amount of 10kg / t pulp. This example is a laboratory example.

Embodiment 3

[0046] The raw material for APMP pulping is 100% poplar; the slurry to be treated is the output slurry of the pulp line multi-disk thickener (the initial slurry concentration is 10%, and it is concentrated to 15% for later use); the bridging agent is a mixed solution of borax and alum , the amount of borax added is 15kg / t pulp, the amount of alum added is 15kg / t pulp; the amount of starch added is 100kg / t pulp. This example is a laboratory example.

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PUM

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Abstract

The invention relates to a method of enhancing strength of chemithermomechanical pulp. The method comprises steps of providing chemithermomechanical pulp; in a stage after the chemithermomechanical pulp is sieved by a pressurized screen and before the chemithermomechanical pulp is conveyed to the pulp discharging line to be sent to be used by a paper machine or to be produced into half-dry pulp, adding a bridging agent into the chemithermomechanical pulp and mixing uniformly, with the bridging agent being one or two of borax and alum, and the adding amount of the bridging agent being 1-50 kg per ton of absolute-dry pulp; and adding starch into the chemithermomechanical pulp containing the bridging agent and mixing uniformly, with the starch being cation starch, and the adding amount of the starch being 10-100 kg per ton of absolute-dry pulp. The invention further provides the chemithermomechanical pulp manufactured by utilization of the method, and paper manufactured with pulp containing the chemithermomechanical pulp. The strength of the chemithermomechanical pulp and especially folding endurance of the paper manufactured with pulp containing the chemithermomechanical pulp are largely enhanced. The strength of the chemithermomechanical pulp is enhanced, thus effectively increasing the adding ratio of the chemithermomechanical pulp in mixed pulp and reducing the production cost.

Description

technical field [0001] The invention relates to a method for increasing the strength of chemical-mechanical pulp, the chemical-mechanical pulp prepared by the method and the paper made by using the slurry containing the above-mentioned chemical-mechanical pulp. Background technique [0002] Compared with chemical pulping, chemical-mechanical pulping (referred to as chemical-mechanical pulping) has many advantages, such as high yield, low energy consumption per ton of pulp, less pollution, and less investment in equipment. The current chemical pulp mainly includes Preconditioning Refiner Chemical Alkaline Preoxide Mechanical Pulping (PRC-APMP) and Bleaching Thermomechanical Chemical Pulp (BCTMP). Because chemical-mechanical pulp is cheaper than chemical pulp, and the use of chemical-mechanical pulp can increase the bulk and opacity of paper. Therefore, many paper mills now use partial mechanical pulp instead of chemical pulp to improve paper quality and reduce production cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/02D21H21/06D21H17/66
Inventor 周仁娟王仁荣秦昀昌韦丹王炜
Owner GOLD EAST PAPER JIANGSU