Pulping method of semi-chemical pulp made from reed

A semi-chemical pulp and reed technology, applied in the field of pulp and paper engineering, can solve the problems of shortage of pulp for packaging cardboard, OCC waste paper can not well meet the quality requirements of high-grade packaging cardboard, etc. The effect of high pulping yield

Inactive Publication Date: 2013-04-17
YUEYANG FOREST & PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past 10 years, with the rapid growth of the demand for packaging cardboard in my country, there has been a shortage of pulp for packaging cardboard. At the same time, domestic OCC waste paper cannot meet the quality requirements for the production of high-grade packaging cardb

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] (1) Material preparation: cut the reeds evenly, remove light dust through a cyclone separator, then screen out some fine impurities such as sand and reed marrow through a round sieve, and finally remove the reed leaves and reed film by a louver dust collector. The length of the chip is 20-40mm, and the pass rate is 85%. The recycled hot water of alkali recovery and part of the reed washing water are recycled to wash the reed, and the reed is then steamed;

[0018] (2) The amount of alkali used is 5% based on NaOH, H factor is 550, and the liquid ratio is 1:2.5. The liquid medicine, the water in the pot and the cooking tank are all heated to 50°C in advance, and the cooking is performed according to the following cooking curve:

[0019] 30min 20min

[0020] 50℃------------→120℃--------------→120℃

[0021] Under these conditions, the pulp yield is 72.6% and the Kappa value is 91.2;

[0022] (3) The inlet slurry concentration of the screw extruder is 10%, and the...

Example Embodiment

[0025] Example 2:

[0026] (1) Material preparation: cut the reeds evenly, remove light dust through a cyclone separator, then screen out some fine impurities such as sand and reed marrow through a round sieve, and finally remove the reed leaves and reed film by a louver dust collector. The length of the chip is 20-40mm, and the pass rate is 86%. The reed chip is washed by the recycled hot water of alkali recovery and part of the reed washing water, and the reed chip is steamed;

[0027] (2) The amount of alkali used is 7.5% based on NaOH, H factor is 850, and the liquid ratio is 1:3.2. The liquid medicine, the pot water and the cooking tank are all heated to 50°C in advance, and the cooking is carried out according to the following cooking curve:

[0028] 12min 39min

[0029] 50℃------------→110℃--------------→110℃

[0030] Under these conditions, the pulp yield is 67.9% and the Kappa value is 61.4;

[0031] (3) The inlet slurry concentration of the screw extruder is 11%, and the outl...

Example Embodiment

[0034] Example 3:

[0035] (1) Material preparation: cut the reeds evenly, remove light dust through a cyclone separator, then screen out some fine impurities such as sand and reed marrow through a round sieve, and finally remove the reed leaves and reed film by a louver dust collector. The length of the sheet is 20-40mm, and the pass rate is 80%. The reed sheet is washed by the recycled hot water of alkali recovery and part of the reed washing water, which is then steamed;

[0036] (2) The amount of alkali used is 10% based on NaOH, H factor is 1100, and the liquid ratio is 1:3.5. The liquid medicine, the water in the pot and the cooking tank are all heated to 50°C in advance, and the cooking is carried out according to the following cooking curve:

[0037] 8min 68min

[0038] 50℃------------→120℃--------------→120℃

[0039] Under these conditions, the pulp yield is 61.2% and the Kappa value is 53.1;

[0040] (3) The inlet slurry concentration of the screw extruder is 10%, and the ou...

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Abstract

The invention discloses a pulping method of semi-chemical pulp made from reed. The pulping method comprises the steps of: preparing for the raw material, cooking, shoving by using a screw, pulp-grinding at a normal pressure, washing and screening. The pulping method is characterized by comprising the following steps: 1, the raw material is prepared by adopting a dry and wet process, to be specific, the reed with a length of 20-40mm and the percent of pass being more than 80 percent is provided; 2, cooking is carried out by adopting a caustic soda process, wherein the alkali charge is 5-10 percent by weight in the terms of NaOH, the liquid ratio is 1:(2.5-3.5) and the H factor is 500-1200, the yield of the pulp obtained by cooking is 60-80 percent and the Kappa value of the pulp is 50-100; 3, the pulp feeding concentration of a screw shoving machine is 8-12 percent, the pulp discharging concentration of the screw shoving machine is 20-40 percent; 4, the normal pressure pulp grinding concentration of one section is 10-40 percent, and the pulp beating degree is 20-30 DEG SR; and 5, the ring crush compression resistance of the reed semi-chemical pulp is good, the ring crush index is not less than 8.0N.m/g, and the fracture length of the pulp is not less than 4.5km. The pulping method is high in yield, and realizes effective utilization of the reed resources; and the produced reed semi-chemical pulp has high quality and can be used for producing high-grade fluting mediums and case boards.

Description

technical field [0001] The invention relates to a semi-chemical pulping method using reeds as raw materials, and belongs to the technical field of pulping and papermaking engineering. Background technique [0002] The pulp made from plant fiber and processed by different processing methods can be divided into mechanical pulp, chemical mechanical pulp, chemical pulp and semi-chemical pulp according to the processing method. Semi-chemical pulp refers to the pulp made by combining chemical treatment of pulping raw materials and mechanical dissociation to separate fibers. Chemical treatment usually removes about 50% of lignin and 30%-50% of hemicellulose in raw materials, and the pulp yield is usually 60%-80%. The properties of pulp are between chemical pulp and chemical-mechanical pulp, and it is mainly used to produce packaging paper, cardboard, etc. [0003] In foreign countries, hardwood is mainly used as raw material to produce semi-chemical pulp, and the quality of pulp ...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21C3/02D21C9/18
Inventor 陈金山马乐凡周海东林本平肖友年李望南赵凌泉
Owner YUEYANG FOREST & PAPER CO LTD
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