News printing paper and preparation method thereof

A technology of newsprint and straw pulp, applied in the field of pulp and paper making, can solve the problems of unresolved newsprint whiteness, adverse effects on eyesight, etc.

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

Although many scientific and technical personnel are committed to the research and development of pulping technology and new fiber raw materials, due to technical limitations, the problem of using non-wood fiber instead of wood fiber to make newsprint cannot be solved, nor does it solve the problem of newsprint whiteness on people. Problems that adversely affect vision

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] Prepare the wheat straw material with a hammer crusher and put it into the steaming ball. Add the cooking liquid to the steaming ball. The amount of ammonium sulfite added is 9% of the absolute dry material, the liquid ratio is 1:2, the first heating Raise the temperature to 110°C, keep it at this temperature for 30 minutes, release steam for another 25 minutes, and heat it up again for 60 minutes to a temperature of 168°C and keep it for 90 minutes. The high-hardness pulp obtained after cooking has a hardness of 13, a beating degree of 24.6°SR, diluted with dilute black liquor to a concentration of 2.5%, and then is screened by the screening method of the prior art such as a skip screening method. Is 0.5%. Then use the prior art vacuum washer for washing. After washing, a high-hardness slurry with a concentration of 10% is obtained, which is transported to the medium-consistency slurry pipe. It is transported to the oxygen delignification reaction tower by the medium ...

Embodiment 2

[0147] The straw raw material is prepared by a hammer crusher and then put into the steaming ball. Add the cooking liquid to the steaming ball. The amount of ammonium sulfite added is 11% of the absolute dry raw material, the liquid ratio is 1:3, the first heating Raise the temperature to 113°C, keep it at this temperature for 30 minutes, release steam for another 27 minutes, reheat for 65 minutes to a temperature of 170°C, and keep it for 85 minutes. The hardness of the high-hardness pulp obtained after cooking is 14 equivalent to Kappa's value of 35.5, and the beating degree is 23.7°SR. It is diluted with dilute black liquor to a concentration of 2.5%, and then subjected to prior art screening methods such as skip screening. After screening, the loss in screening is 0.5%. Then use the prior art vacuum washer for washing. After washing, a high-hardness slurry with a consistency of 11% is obtained, which is transported to the medium-consistency slurry pipe. It is transported ...

Embodiment 3

[0150] After 50% straw and 50% wheat straw are prepared by dry method using a hammer crusher, they are loaded into the batch spherical digester, and the cooking liquid is added to the batch spherical digester. The amount of ammonium sulfite added is absolutely dry 12% of the raw material, liquid ratio 1:4, the first heating is heated to 120℃, the temperature is kept at this temperature for 35 minutes, then the steam is released for 25 minutes, the second heating is heated for 60 minutes to the temperature of 172℃, and the temperature is kept 83. minute. The high-hardness pulp obtained after cooking has a hardness of 15 and a beating degree of 22.3°SR. It is diluted with dilute black liquor to a concentration of 2.5%, and then is screened by the screening method of the prior art such as skipping screening. Is 0.2%. Then use the prior art vacuum washer for washing. After washing, a high-hardness pulp with a concentration of 10% is obtained, and then the pulp is heated to 70°C b...

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Abstract

The invention provides a news printing paper. Pulp materials of the news printing paper comprise 20-100 percent of unbleached straw pulp and 80-0 percent of wood pulp, the definite quantity is 42-51g/m2, the opacity is more than or equal to 88 percent, the fracture length is more than or equal to 3.5km, and the whiteness is 35-75 percent of ISO. The production of the news printing paper not only can save the energy and cost, but also can significantly reduce the emission of pollutants.

Description

Technical field [0001] The present invention relates to the application of unbleached grass pulp in the preparation of newsprint. Specifically, the present invention relates to newsprint using pulp containing unbleached straw pulp as raw material and a preparation method thereof, belonging to pulping Papermaking field. Background technique [0002] The prior art discloses some technical solutions for manufacturing newsprint, which are specifically as follows: [0003] The patent application with application number 93108185.8 discloses a straw newsprint and its manufacturing method. Its pulping methods mainly include sulfite method, ammonium method, sulfate method, and caustic soda method; the process flow of its manufacturing method is: cutting grass -Dust removal-pre-staining-cooking-washing-concentration-bleaching-beating-seasoning-papermaking-finishing. Its technical feature is that it adopts low-temperature fast cooking and bleaching, and adopts a hypochlorite single-stage lo...

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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