Preparation method of high-breakage-resistance kraft paper

A kraft paper and break-resistant technology, applied in pulp beating method, adding water repellent, adding reinforcing agent, etc., can solve the problems of complicated structure of wire part, increasing the number of production line equipment, complicated production process, etc.

Active Publication Date: 2021-06-01
SHANYING PAPER (GUANGDONG) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the pulping process in the kraft paper manufacturing process generally uses wood pulp and waste paper pulp as raw materials, which are separately beaten, and then passed through three layers (surface layer, core layer, etc.) layer and bottom layer) Fourdrinier combined to form, thus producing kraft paper, the quantitative value of the produced kraft paper is 120-280g / m2, and almost does not involve the quantitative value of 120g / m2 sup> and the following products cannot meet the market demand for low-weight high-strength kraft paper, and the burst index of kraft paper is 3.6-4.3Kpa.m2 / g
The mode of separate beating is adopted, which greatly increases the number of equipment in the production line, and uses a 3-layer net structure, the structure of the net part is complex, and the production process is complicated
For pulping, the core bottom layer pulp adopts the overall technological process of waste paper pulping, and the process is relatively cumbersome

Method used

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  • Preparation method of high-breakage-resistance kraft paper

Examples

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Effect test

Embodiment 1

[0028] A method for preparing high-burst-resistant natural color kraft paper, comprising the steps of:

[0029] (1) Preparation materials:

[0030] Uncolored coniferous wood pulp: dry process waste paper pulp = 60:40, wherein the average fiber length of natural coniferous wood pulp is 2.15 mm, the average fiber length of dry process waste paper pulp is 1.7 mm, and the ash content is 2.6%;

[0031] The dry strength agent is 15 kg / ton air-dried pulp, the sizing agent in the pulp is 10 kg / ton air-dried pulp, the cationic starch is 13 kg / ton air-dried pulp, and the paper basis weight is 70g / m 2 ;

[0032] (2) Mixing and disintegration: the fiber raw material is entered into a hydropulper for mixing and disintegration, and the disintegration concentration is 4.5%;

[0033] (3) Sand removal: under the condition of 5% concentration, carry out high-concentration slag removal to the slurry, and use vortex motion to remove heavier impurities;

[0034] (4) High-consistency beating: th...

Embodiment 2

[0040] A preparation method of high breakage-resistant white kraft paper, comprising the steps of:

[0041] (1) Preparation materials:

[0042] Bleached softwood pulp: bleached hardwood pulp=60:40, wherein the average fiber length of bleached softwood pulp is 2.18mm, and the average fiber length of bleached hardwood pulp is 1.33mm;

[0043] The dry strength agent is 9 kg / ton air-dried pulp, the sizing agent in the pulp is 9 kg / ton air-dried pulp, the cationic starch is 11 kg / ton air-dried pulp, and the paper basis weight is 80g / m 2 ;

[0044] (2) Mixing and disintegration: the fiber raw material is entered into a hydropulper for mixing and disintegration, and the disintegration concentration is 4.5%;

[0045] (3) Sand removal: under the condition of 5% concentration, carry out high-concentration slag removal to the slurry, and use vortex motion to remove heavier impurities;

[0046] (4) High-consistency beating: the pulp enters the high-consistency disc refiner through the ...

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Abstract

The invention discloses a preparation method of high-breakage-resistance kraft paper, which comprises the following steps: fiber raw materials are subjected to mixing and disintegrating, desanding, high-concentration pulping, low-concentration pulping, net forming, squeezing and drying, wherein the concentration of the high-concentration pulping is 30-35%, the concentration of the low-concentration pulping is 4.8-6%, and the concentration of net forming is 0.15-0.25%. The kraft paper with good water absorption, high longitudinal tear index, high burst index and high tensile index can be prepared through the preparation method, indexes of the kraft paper are far away from those of common kraft paper in supermarkets, and the preparation method is suitable for papermaking of the kraft paper with low gram weight of 40g / m < 2 >-140g / m < 2 > and is simple in preparation process.

Description

technical field [0001] The invention relates to the technical field of kraft paper preparation, in particular to a preparation method of high breakage-resistant kraft paper. Background technique [0002] With the improvement of domestic consumption level, the demand for packaging cartons is increasing, and the containerboard industry as a raw material for packaging cartons has developed rapidly. At present, container board includes kraft paper and corrugated base paper, and there are various quantitative paper types in the market. In recent years, with the introduction of the national plastic restriction order, the application range of paper has gradually expanded. As the base paper for making industrial paper, kraft paper must have a certain strength to meet the needs of use. With the lack of forest resources and the implementation of environmental protection policies, the supply of fiber raw materials is tight and the quality is declining. Under the current conditions, th...

Claims

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Application Information

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IPC IPC(8): D21D1/02D21H11/14D21H21/16D21H21/18
CPCD21H11/14D21H21/18D21H21/16D21D1/02Y02W30/64
Inventor 夏雨张祖华叶兆飞温海东王立海董剑飞
Owner SHANYING PAPER (GUANGDONG) CO LTD
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