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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 cardboard. Therefore, in Shandong, Henan, Hebei, Inner Mongolia, etc. Some semi-chemical pulp production lines have been put into production one after another, using mixed hardwood, pine, cotton stalk, wheat straw, etc. as raw materials to produce container board and corrugated base paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Material preparation: cut the reed evenly, remove light dust through the cyclone separator, and then remove some small impurities such as silt and reed pith through the round sieve, and finally remove the reed leaves and reed film through the louver dust remover, and the reed The length of the slices is 20-40mm, and the qualified rate is 85%. The reed slices are washed by using the sewage hot water recovered by alkali and part of the reed washing water to be recycled, and the reed slices are then steamed;

[0018] (2) Under the conditions of 5% NaOH, H factor 550, and liquid ratio 1:2.5, the liquid medicine, water in the pot and cooking tank are all heated to 50°C in advance, and cooking is carried out according to the following cooking curve:

[0019] 30min 20min

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

[0021] Cooked under these conditions, the resulting pulp yield was 72.6%, and the Kappa value was 91.2;

[0022] (3) The pulp concentration of the screw...

Embodiment 2

[0026] (1) Material preparation: cut the reed evenly, remove light dust through the cyclone separator, and then remove some small impurities such as silt and reed pith through the round sieve, and finally remove the reed leaves and reed film through the louver dust remover, and the reed The length of the slices is 20-40mm, and the qualified rate is 86%. The reed slices are washed by using the sewage hot water recovered by alkali and part of the reed washing water recycling, and the reed slices are then steamed;

[0027] (2) The amount of alkali to be used is 7.5% as NaOH, the H factor is 850, and the liquid ratio is 1:3.2. The liquid medicine, 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:

[0028] 12min 39min

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

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

[0031] (3) The ...

Embodiment 3

[0035] (1) Material preparation: Cut the reeds evenly, remove light dust through the cyclone separator, and then remove some small impurities such as silt and reed pith through the round sieve, and finally remove the reed leaves and reed film through the louver dust remover, and the reed The length of the slices is 20-40mm, and the pass rate is 80%. The reed slices are washed with the sewage hot water recovered from alkali and part of the reed washing water, and the reed slices are then steamed;

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

[0037] 8min 68min

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

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

[0040] (3) The pulp concentration of the scr...

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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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