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Pulp modifying material and its producing method

A technology for modifying materials and manufacturing methods, used in papermaking, textiles and papermaking, fiber raw material processing, etc., and can solve the problems of reporting, strength, opacity and stiffness reduction, recycled newsprint that have not been technically and economically successful. Performance has not seen any description and other issues

Inactive Publication Date: 2002-11-06
SICHUAN HONGDA (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the whiteness of deinked pulp can only reach 85-90% of the whiteness of base paper, and the strength and opacity are limited, it can only produce whiteness ≤ 45% (ISO), weight ≥ 51g / m 2 low grade recycled newsprint
Chinese patent document CN 1167854 discloses a "method for producing recycled newsprint from waste paper", which uses cooking, deinking, bleaching, beating, purification, papermaking and other processes, and the performance of the recycled newsprint produced has no description
This method uses up to 50% virgin wood pulp, which directly or indirectly consumes forest resources and produces cooking black liquor; in addition, special coating equipment is required
[0005] One of the technical problems that people have encountered in the low weight of newsprint is that the low weight will cause the strength, opacity and stiffness of the paper to decrease
In order to solve the above problems, the usual method is to seek a slurry ratio with greater strength and higher opacity, or to add a small amount of calcium carbonate and talc fillers, but this causes a decrease in strength and is difficult to obtain industrial applications
As for ultra-low quantitative (44-43g / m 2 ) newsprint, so far no technically and economically successful reports

Method used

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  • Pulp modifying material and its producing method
  • Pulp modifying material and its producing method
  • Pulp modifying material and its producing method

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Embodiment Construction

[0025]Studies have shown that general recycled newsprint is mainly composed of mechanical wood pulp fibers after deinking, and its mechanical strength, such as breaking length and tearing degree, depends on the physical properties of the fibers that make up the paper (the tensile strength of a single fiber) , chemical properties, especially surface chemical properties (binding force between fibers) and geometric packing characteristics (such as fiber length, diameter, fiber aspect ratio, fiber surface morphology, whether bifurcation and brooming, long and short fiber collocation way, etc.). The whiteness and opacity of paper depend on the whiteness and refractive index of the fibers that make up the paper. Since the refractive index of paper fibers is generally around 1.53, the refractive index decreases with the increase of the degree of fiber bleaching, so the requirements for making high whiteness, low transparency and low weight paper are contradictory. Add high refractiv...

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PUM

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Abstract

The paper pulp modifying material contains superfine mineral fiber and superfine mineral powder and has the chemical composition of: SiO2 40.15-52.23 wt%, CaO 38.27-48.48 wt%, Al2O3 1.69-2.48 wt%, SO3 1.88-2.51 wt% and C1 0.07-0.345 w. It has the physical bleaching function, and when the paper pulp modifying material in 5-20 % is added into paper pulp, high whiteness news paper meeting the environment protection requirement may be produced.

Description

[0001] The present invention is a divisional application of the invention patent application with the application number 00100435.2, the application date being January 31, 2000, and the invention title being "a kind of high whiteness and low quantitative regenerated newsprint and its manufacturing method". Technical field: [0002] The invention relates to a pulp modified material and a manufacturing method thereof. The pulp modification material contains mineral ultrafine fiber and mineral ultrafine powder, and is especially suitable for producing high brightness and low weight recycled newsprint with improved microstructure. Background technique: [0003] The biggest problem facing mankind in the 21st century is the increasing scarcity of resources and environmental protection. The wood pulp required for the traditional production of newsprint comes from wood. After peeling, chipping, cooking, washing, bleaching, beating and other processes, on the one hand, a large amount...

Claims

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Application Information

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IPC IPC(8): D21H21/14
Inventor 孙传敏刘沧龙李一永
Owner SICHUAN HONGDA (GRP) CO LTD