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Waterproof kraft paper manufacturing process

A manufacturing process and technology of kraft paper, applied in papermaking, paper machine, adding water repellent, etc., can solve the problems of unfavorable use, difficult to treat waste water, high cost of kraft paper, improve water resistance, reduce porosity, and improve water resistance. Effect

Active Publication Date: 2015-04-08
NANTONG NEW CENTURY MECHANICAL & ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] After searching, the inventor found that the patent number is 2008100933910, and the patent name is: high-quality kraft paper and its production method. It discloses a method for making kraft paper by using masson pine, Chinese fir, and broad-leaved wood. Although it has achieved good kraft paper performance, the production of kraft paper The cost of raw materials is very high, resulting in a high cost of kraft paper, which is not conducive to the use in many places with low requirements
[0010] After searching, the inventor also found that the application number is 201310246673.0, and the patent name is: water-absorbing kraft paper and its manufacturing process. Water-absorbing kraft paper made of wet strength agent, whitening agent and dispersant, but there are many additives in the kraft paper, resulting in the production of kraft paper in the actual production, which will produce difficult-to-treat wastewater, which is not conducive to clean production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The manufacturing process of the water-resistant kraft paper includes the following steps:

[0027] (1) Selection of raw materials: select kraft bleached softwood pulp, hardwood pulp and bamboo pulp, the weight ratio of kraft bleached softwood pulp, hardwood pulp and bamboo pulp is 1:1:0.3;

[0028] (2) Raw material mixing and beating: Put the kraft bleached softwood pulp, hardwood pulp and bamboo pulp into the pulping tank according to the ratio described in step (1), and add industrial water to the pulping tank and stir Mix evenly to obtain a mixed slurry, the concentration of the mixed slurry is 1.5%;

[0029] (21) The mixed slurry obtained in step (2) is first transported to the slurry storage tank, and the cationic emulsion rosin gum is poured into the slurry storage tank, and the mixture is stirred and mixed evenly, and the concentration of the cationic emulsion rosin gum reaches 0.25%;

[0030] (22) Transport the slurry obtained in step (21) to the fiber separator for co...

Embodiment 2

[0034] The manufacturing process of the water-resistant kraft paper includes the following steps:

[0035] (1) Selection of raw materials: select kraft bleached softwood pulp, hardwood pulp and bamboo pulp. The weight ratio of kraft bleached softwood pulp, hardwood pulp and bamboo pulp is 1:1:0.5;

[0036] (2) Raw material mixing and beating: Put the kraft bleached softwood pulp, hardwood pulp and bamboo pulp into the pulping tank according to the ratio described in step (1), and add industrial water to the pulping tank and stir Mix evenly to obtain a mixed slurry, the concentration of the mixed slurry is 2.2%;

[0037] (21) The mixed slurry obtained in step (2) is first transported to the slurry storage tank, and the cationic emulsion rosin gum is poured into the slurry storage tank, and the mixture is stirred and mixed evenly, and the concentration of the cationic emulsion rosin gum reaches 0.3%;

[0038] (22) Transport the slurry obtained in step (21) to the fiber separator for coa...

Embodiment 3

[0042] The manufacturing process of the water-resistant kraft paper includes the following steps:

[0043] (1) Selection of raw materials: select kraft bleached softwood pulp, hardwood pulp and bamboo pulp. The weight ratio of kraft bleached softwood pulp, hardwood pulp and bamboo pulp is 1:1:0.7;

[0044] (2) Raw material mixing and beating: Put the kraft bleached softwood pulp, hardwood pulp and bamboo pulp into the pulping tank according to the ratio described in step (1), and add industrial water to the pulping tank and stir Mix evenly to obtain a mixed slurry, the concentration of the mixed slurry is 3.0%;

[0045] (21) The mixed slurry obtained in step (2) is first transported to a slurry storage tank, and the cationic emulsion rosin gum is poured into the slurry storage tank, and the mixture is stirred and mixed evenly, and the concentration of the cationic emulsion rosin gum reaches 0.35%;

[0046] (22) Transport the slurry obtained in step (21) to the fiber separator for coar...

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Abstract

A waterproof kraft paper manufacturing process includes steps of (1) selecting raw materials, to be specifically, selecting softwood pulp, hardwood pulp and bamboo pulp; (2) mixing and pulping the raw materials, specifically, feeding the softwood pulp, the hardwood pulp and the bamboo pulp into a repulping tank to obtain mixed pulp; (3) grinding into thick liquid; (4) processing, sequentially performing a sizing process, a dewatering process, a drying process, a pressing process and a polishing process, wherein the pressure of the pressing process ranges from 0.17 MPa to 0.21 MPa, and a linear pressure range of the polishing process ranges from 185 kN / m to 220 kN / m. Length and diameter of the fibers are compensated, fibers have gaps, the surface of the kraft paper is smoothed by polishing and is dense, the surface fibers are denser, porosity is decreased and water resistance is improved.

Description

Technical field [0001] The invention relates to a manufacturing process of water-resistant kraft paper, and belongs to the technical field of papermaking technology. Background technique [0002] Kraft paper, used as a packaging material, has high strength, usually yellowish brown, semi-bleached or fully bleached kraft pulp is light brown, cream or white, with a basis weight of 80~120g / m 2 , The tear strength, breaking power and dynamic strength are very high. Most of them are web paper, but also flat paper. It uses kraft softwood pulp as the raw material. After beating, it is made on a Fourdrinier paper machine. It can be used as a cement bag. Paper, envelope paper, glue seal paper, asphalt paper, cable protection paper, insulation paper, etc. [0003] At present, the more mature kraft paper production process usually uses kraft wood pulp as raw material, and uses kraft larch wood pulp as raw material. After bleaching, screening, beating, sizing, slag removal and pre-net system tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F11/02D21H15/10D21H21/16
CPCD21F11/02D21H15/10D21H21/16
Inventor 邵剑
Owner NANTONG NEW CENTURY MECHANICAL & ELECTRICAL