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Writing paper and preparation method thereof

A technology of writing paper and straw pulp, which is applied in the field of pulp and paper making, can solve the problems of increasing the cost and difficulty of sewage treatment, increasing the direct production cost of paper making, and being unsuitable for the production of high-grade paper products, etc., shortening the cooking and heat preservation time, Avoid harm to the human body, the effect of large dosage

Inactive Publication Date: 2010-07-28
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] To sum up, the strength of grass pulp produced by the existing grass fiber pulping and papermaking technology is greatly reduced after bleaching, and the water filtration performance is poor, so it is not suitable for producing high-grade paper products; dyes or dyes are added to the bleached pulp before papermaking. Pigments not only increase the direct production cost of papermaking, but also increase the cost and difficulty of sewage treatment due to the addition of dyes or pigments
How to improve the production process, reduce energy consumption and pollution, produce high-quality grass pulp, and then use high-quality grass pulp as the main pulp to make high-grade writing paper that can protect people's eyesight and greatly save costs , the prior art does not provide a better way, in view of this, the present invention is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] The wheat straw raw material is prepared by a hammer crusher and put into the steaming ball, and the cooking liquid is added to the steaming ball. Raise the temperature to 110°C, keep it warm at this temperature for 30 minutes, let off steam for 25 minutes, heat up the temperature again for 60 minutes to 168°C, and keep it warm for 90 minutes. The hardness of the obtained high-hardness pulp after cooking is 13, and the degree of beating is 24.6 ° SR. It is diluted to a concentration of 2.5% with dilute black liquor, and then screened by screening methods of the prior art such as the jumping screen screening method. Loss in screening 0.5%. Then adopt the vacuum washing machine in the prior art to wash. After washing, a high-hardness pulp with a concentration of 10% is obtained, which is sent to the medium-consistency pulp pipe. It is transported to the oxygen delignification reaction tower through the medium-consistency pump. Before entering the reaction tower, the sl...

Embodiment 2

[0136] Put the rice straw raw material into the steaming ball after preparing the material with a hammer crusher, add the cooking liquid into the steaming ball, the amount of ammonium sulfite added is 11% of the dry raw material, the liquid ratio is 1:3, and the first heating Raise the temperature to 113°C, keep the temperature at this temperature for 30 minutes, let off steam for 27 minutes, heat up the temperature again for 65 minutes to 170°C, and keep the heat for 85 minutes. The hardness of the high-hardness pulp obtained after cooking is 14, which is equivalent to a kappa value of 35.5, and the degree of beating is 23.7 ° SR. It is diluted with dilute black liquor to a concentration of 2.5%, and then passed through existing screening methods such as skipping screening. Screening was performed with a loss of 0.5% in screening. Then adopt the vacuum washing machine in the prior art to wash. After washing, a high-hardness pulp with a concentration of 11% is obtained, which...

Embodiment 3

[0139] After 50% rice straw and 50% wheat straw raw materials are dry-prepared with a hammer crusher, they are loaded into a batch spherical digester, and cooking liquid is added to the batch spherical digester, and the amount of ammonium sulfite is absolutely dry. The amount of raw materials is 12%, the liquid ratio is 1:4, the first heating is raised to 120°C, the temperature is kept at this temperature for 35 minutes, and the steam is released for 25 minutes, the second heating is raised to 172°C for 60 minutes, and the temperature is kept at 83 minute. The hardness of the high-hardness pulp obtained after cooking is 15, and the degree of beating is 22.3 ° SR. It is diluted to a concentration of 2.5% with dilute black liquor, and then screened by screening methods of the prior art such as the jumping screen screening method. Loss in screening 0.2%. Then adopt the vacuum washing machine in the prior art to wash. After washing, a high-hardness pulp with a concentration of 1...

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Abstract

The invention provides writing paper made of slurry comprising the following components by percentage: 20% to 100% of unbleached straw pulp and 0% to 80% of wood pulp. According to the ISO (International Standardization Organization), the whiteness of the writing paper is 35% to 75%; the opacity thereof is higher than or equal to 75%; and the basis weight thereof is 45.0g / m<2> to 80.0g / m<2>. The production process of the writing paper is energy-saving and cost-saving; and the pollutant emission can be greatly reduced.

Description

technical field [0001] The invention relates to the application of grass unbleached pulp in the preparation of writing paper. Specifically, the invention relates to writing paper and a preparation method thereof, belonging to the field of pulp and paper making. Background technique [0002] The prior art discloses some technical solutions for writing paper, as follows: [0003] CN200610077972 discloses a method for producing paper pulp by using herbal plants and crop straws and ore powder, which is characterized in that the steps included are: (1) herbal plants and crop straws are crushed, with a particle size of 450-40 mesh; (2) Straw powder processing; (3) put the processed straw powder and ore powder with a particle size of 40 to 14 into a mixer and stir; (4) inject water into the stirred mixture to form a suspension, pour out the suspension and separate the ore powder , and then filter the suspension through a 100-60 mesh sieve to obtain the original pulp, and the ore p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21F11/00D21C3/00D21C3/02D21C1/00D21C9/18D21D5/02D21H17/68D21H17/28D21H21/18D21H17/66D21H17/67
Inventor 李洪法宋明信王建民何忠成
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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