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Preparation method of sulfate acacia wood pulp with high bulk and low extract

A bulk and extractable technology, applied in pulp bleaching, cellulose raw material pulping, cellulose pulp post-processing, etc., can solve the problems of low bulk, reduced machine speed and running performance, insufficient degradation, etc. The effect of extractables, optimized bulk, high tensile index

Inactive Publication Date: 2020-01-03
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the content of extractives in pulp prepared from acacia wood is generally high and the fibers are fine, so most of the conventional acacia kraft pulp has low bulk, and the amount of bleached chemical pulp is high, with high extractives and lipophilic substances. The degradation in the cooking or bleaching stage is not complete enough, it is difficult to handle in the papermaking operation, and ultimately reduces the speed and running performance of the machine. In today's market where wood resources are scarce, there is an urgent need to use acacia wood to produce wood pulp with high bulk and low extractables

Method used

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  • Preparation method of sulfate acacia wood pulp with high bulk and low extract
  • Preparation method of sulfate acacia wood pulp with high bulk and low extract

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A kind of kraft acacia wood pulp with high bulkiness and low extractives, its raw wood is composed of the following raw materials in mass percentage: black wattle acacia wood 50% and thick pod acacia wood 50%, the preparation method of the kraft acacia wood pulp, Include the following steps:

[0027] S1. Material preparation: Spray the wood chips with 2ppm of white rot fungus, store them for 10 days, and separate them through the belt conveyor to the air screen or shaker system. Select good chips with a size of 8-65mm and send them to pulping;

[0028] S2. Soaking: Put the wood chips into the pre-preg tower for immersion, the immersion temperature is 85°C, and the time is 40min;

[0029] S3. Cooking: The wood chips and cooking liquid pre-soaked in the pre-soaking tower enter the digesting kettle through the high-pressure feeder for cooking. The cooking white liquor is NaOH and Na 2 The mixed liquor composed of S, the degree of sulfidation of white liquor is 30%, the am...

Embodiment 2

[0039] A kind of kraft acacia wood pulp with high bulkiness and low extractives, its raw wood is composed of the following raw materials in mass percentage: black wattle acacia wood 70% and thick viburnum acacia wood 30%, the preparation method of the kraft acacia wood pulp, Include the following steps:

[0040] S1. Material preparation: Spray wood chips with 5ppm of white rot fungus, store them for 20 days, and separate them through the belt conveyor to the wind screen or shaker system, select good chips with a size of 8-65mm, and send them to pulping;

[0041] S2. Soaking: Put the wood chips into the pre-preg tower for immersion, the immersion temperature is 120°C, and the time is 80min;

[0042]S3. Cooking: The wood chips and cooking liquid pre-soaked in the pre-soaking tower enter the digesting kettle through the high-pressure feeder for cooking. The cooking white liquor is NaOH and Na 2 The mixed liquor composed of S, the degree of sulfidation of white liquor is 35%, the...

Embodiment 3

[0052] A kind of kraft acacia wood pulp with high bulk and low extractives, its raw wood is composed of the following raw materials in mass percentage: black wattle acacia wood 55% and thick viburnum acacia wood 45%, the preparation method of the kraft acacia wood pulp, Include the following steps:

[0053] S1. Material preparation: Spray wood chips with 3ppm of white rot fungus, store them for 15 days, and separate them through the belt conveyor to the air screen or shaker system, select good chips with a size of 8-65mm, and send them to pulping;

[0054] S2. Soaking: Put the wood chips into the pre-preg tower for immersion, the immersion temperature is 102°C, and the time is 60min;

[0055] S3. Cooking: The wood chips and cooking liquid pre-soaked in the pre-soaking tower enter the digesting kettle through the high-pressure feeder for cooking. The cooking white liquor is NaOH and Na 2 For the mixed liquor composed of S, the sulfidation degree of white liquor is 33%, the amo...

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Abstract

The invention provides a sulfate acacia wood pulp with high bulk and low extract, and a preparation method thereof. Cacia mearnsii De Wild. and Acacia crassicarpa Benth. are combined according to a reasonable ratio. The preparation method comprises the following steps: material preparation, soaking, cooking, oxygen bleaching, four-stage bleaching, screening and pulp board making. The method reduces the consumption of DCM extract and chemicals by spraying white rot fungi, and optimizes the four-stage bleaching process, and the prepared paper pulp has the advantages of high bursting strength, high tearing strength, high tensile index, high bulk and extract reduction.

Description

technical field [0001] The invention relates to the field of wood pulp, in particular to a method for preparing acacia wood pulp with high bulk and low extractives. Background technique [0002] Black wattle acacia (scientific name: Acacia amearnsii DeWilld) belongs to the leguminous Acacia genus. It has the characteristics of fast growth and wide application. It is currently the main tanning tree species and one of the precious tanning tree species. Its root system has nodules, which can fix nitrogen and improve the soil. The wood is hard and dense, and it is a good material for wood, ore pillars, and papermaking. It is a fast-growing, high-yielding, high-quality tanning tree species. The bark contains 30-45% tannin, which is used for tanning and dyeing; the wood is tough, and can be used as pit logs, sleepers, poles, ship boards, farm tools, furniture, construction, etc.; it is also a source of honey and greening trees. [0003] Acacia crassicarpa Benth. (scientific nam...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21C5/00D21C7/00D21C9/10D21D5/02D21F13/00
CPCD21C3/00D21C5/005D21C7/00D21C9/1057D21D5/02D21F13/00
Inventor 李树木
Owner HAINAN JINHAI PULP & PAPER
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