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Method of producing original-color paper pulp through low-alkali cooking

An alkaline cooking and natural color technology, applied in the direction of digester, pulping with inorganic alkali, papermaking, etc., can solve the problems of increased acid addition adjustment cost, difficult treatment of polluted white mud, high cost of sewage treatment, and reduced recovery costs and Processing difficulty, saving pulp cost, and reducing the effect of alkali consumption

Inactive Publication Date: 2018-04-27
宁夏同创秸科生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The problems that said method exists are: 1, the rough paper pulp hardness that makes by alkaline cooking method is low, and after delignification, fiber is short without pulling force, and brightness is low; There are many residual alkalis. If the residual alkali is recovered by the alkali recovery method, the cost of alkali recovery will be high, and it will be difficult to treat the polluted lime mud. At the same time, the cost of sewage treatment will be high. If the amount is high, the cost of acid adjustment will also increase

Method used

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  • Method of producing original-color paper pulp through low-alkali cooking
  • Method of producing original-color paper pulp through low-alkali cooking
  • Method of producing original-color paper pulp through low-alkali cooking

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Embodiment Construction

[0031] The present invention is illustrated with examples below, and it should be understood that the examples are used to illustrate the present invention rather than limit the present invention. The scope and essential content of the present invention are defined by the claims.

[0032] Process flow of the present invention:

[0033] Wheat straw—roller mower—dust collector—drum washer—hydraulic grass washer—oblique spiral grass squeezer—belt conveyor—presoaker—steamer ball—spray bin—single screw squeezer—underground storage Pulp tank - pulp tank before washing - 2m 2 Skip sieve - deflagging machine - 4 sets of series planar valve drum type vacuum pulp washing unit - outflow pressure screen - pulp washing machine - secondary purification system - oxygen delignification - pulp washing machine - pulp storage tank (for use in papermaking workshop ).

[0034] The specific process includes the following:

[0035] 1. Wet preparation

[0036] Stack the purchased wheat straw int...

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Abstract

The invention relates to a method of producing original-color paper pulp through low-alkali cooking. The method includes the steps of: material preparation through wet-process, intermittent cooking, screening and washing of slurry, and oxygen delignification treatment, wherein the intermittent cooking is carried out via the low-alkali cooking. In the invention, by adding a special cooking additive, usage amount of alkali is reduced, thus reducing cost of the paper pulp, reducing recovery cost and treatment difficulty, reducing environment pollution and meanwhile improving the quality of the pulp. In addition, by performing defibering treatment to the screened crude pulp, hardness of the crude pulp is increased, and rigidity and toughness of the pulp is maintained. A finish product can satisfy the demands of original-color daily-use paper. The method also increases the yield of the original-color paper pulp.

Description

technical field [0001] The invention belongs to the technical field of papermaking, in particular to a method for producing uncolored pulp by low-alkali cooking. Background technique [0002] Natural color pulp refers to the pulp obtained by cooking and washing to keep its own color tone. It is usually suitable for some paperboards and industrial technical papers that do not require high whiteness. [0003] The uncolored pulp produced from crop stalks (wheat straw 13-15%, reed 17-19%, corn stalk 11-12%, rice straw 11-12%) is usually prepared by alkaline cooking, and then such coarse pulp is Then delignification after washing. The problems that said method exists are: 1, the rough paper pulp hardness that makes by alkaline cooking method is low, and after delignification, fiber is short without pulling force, and brightness is low; There are many residual alkalis. If the residual alkali is recovered by the alkali recovery method, the cost of alkali recovery will be high, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C7/00
Inventor 李世杰张东红赵峰
Owner 宁夏同创秸科生物科技有限公司
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