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Preparation method of mixed material bleached chemimechanical pulp

A technology of mixed materials and mechanical pulp, which is applied in chemical/chemical mechanical pulp, pulp bleaching, pulp dehydration, etc., can solve the problem of single material type, achieve small paper weight, low cost of pulping raw materials, and good light scattering coefficient Effect

Inactive Publication Date: 2018-05-25
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of APMP pulping raw materials mainly poplar wood chips, the use of species is relatively single, to provide a kind of APMP pulping method of acacia and poplar mixed wood

Method used

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Embodiment Construction

[0011] Below by embodiment the present invention is described in detail:

[0012] In the present invention, acacia and poplar are uniformly mixed and refined in proportion, and in order to improve the pulp quality and the difference in the performance of acacia refining and bleaching, a bleach accelerator is added to 1# prepreg and 2# prepreg respectively, using Magnesium alkali replaces part of sodium alkali, and adopts H2O2+OBA relay bleaching method. (1) Characteristics of pulping fiber raw materials: Italian poplar 60%, acacia 40%, wood chip length 19~25mm, thickness 4.0±2 mm, wood chip qualification rate ≧ 80% (mass percentage), bark rate ≦ 0.6%, wood chip Moisture ≧40%. (2) Brief description of the production process: wood chip preparation → 1# pre-steaming bin → wood chip washing → 2# pre-steaming bin → 1st stage extrusion → 1# prepreg (adding 1# prepreg solution) → 2nd stage Extrusion → 2# presoaker (adding 2# presoaking solution) → 1st stage mill (adding point of bl...

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Abstract

The invention discloses a technique for preparing acacia and poplar mixed material bleached chemitmechanical pulp. The technique is mainly characterized in that a pulping mode in which magnesium basereplaces part of soda is that an additive bleaching accelerator is added into presoaking and bleaching liquid, and a disulfonic acid liquid brightening agent is added into a cooling helical inlet to improve the pulping and bleaching effect of an acacia and poplar mixed material, so that the slurry quality is improved. The high-yield pulp produced by the technique is higher in loose thickness, higher in light-scattering coefficient, higher in pulping yield, lower in pulping cost and lower in COD content in discharged wastewater. Adaptive materials produced from the high-yield pulp are wider inapplication range.

Description

technical field [0001] The invention relates to a process method for preparing bleached mechanical pulp, in particular to a process method for preparing bleached mechanical pulp of acacia and poplar mixed wood. Background technique [0002] At present, the raw materials for APMP pulping are mainly poplar wood chips, and the types of materials used are relatively single. Due to the good processing performance of poplar wood, it has become the most consumed log material in my country's panel industry. The procurement of poplar wood fiber raw materials is a comprehensive competition within and between industries. At present, poplar wood raw materials are difficult to meet the supply demand. The poplar sapwood is white, the heartwood is light reddish brown, the sapwood is wider than the heartwood, the material is light and soft, and the specific gravity is 0.37-0.40. Acacia is the tree species with the largest planting area next to poplar in my country, and it is also the mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/02D21C9/10D21C9/16D21C1/02D21C1/06D21C1/04D21D1/30D21D5/24D21D5/02D21C9/18
CPCD21C1/02D21C1/04D21C1/06D21C9/1036D21C9/163D21C9/18D21D1/303D21D5/02D21D5/24D21H11/02
Inventor 朱宏伟刘成良冀振华肖友年林本平李甘霖赵靖刘永丰洪嘉远
Owner YUEYANG FOREST & PAPER CO LTD
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