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Method for preparing high bulk eucalyptus alkaline hydrogen peroxide mechanical pulp

A hydrogen peroxide and bulk technology, applied in the field of preparing high bulk eucalyptus wood alkaline hydrogen peroxide mechanical pulp, can solve the problems of inability to meet a large number of demands, reduce paper stiffness, long growth cycle, etc., to reduce chemical consumption , Increase the fine fiber content, the effect of loose paper structure

Active Publication Date: 2016-07-06
GUANGXI JINGUI PULP PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet the poplar wood that adopts in the raw material of this inventive method, grows mostly in northern region, and growth period is long, and resource amount is insufficient, can't satisfy the large demand of wood raw material of papermaking industry; If it is too large, the flexibility of the fiber is improved, the stiffness of the paper is reduced, and the bulk is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing high-bulk eucalyptus alkaline hydrogen peroxide mechanical pulp, carried out in the following steps:

[0032] (1) Heat treatment and washing of raw materials: take the peeled eucalyptus wood that has been stored for 3 months, cut it into eucalyptus chips with a length of 7-45mm, a thickness of 3-7mm, and a width of 5-20mm, heat it to 60°C with secondary steam, and heat it to 88°C Wash with water to remove knots and gravel;

[0033] (2) Pre-steaming: pre-steaming the washed eucalyptus chips at 88°C for 18 minutes;

[0034] (3) Extrusion and impregnation: Extrude the pre-steamed eucalyptus chips with a wood chip press with a compression ratio of 1:2.8~4, with a torque of 180kNm. The extruded eucalyptus chips can absorb the liquid better due to the sponge effect; Impregnated in the liquid medicine after pressing, the composition of the liquid medicine is: H 2 o 2 , the dosage is 1.7% of the absolute dry wood chip weight; NaOH, the dosage is 1.6% o...

Embodiment 2

[0045] A method for preparing high-bulk eucalyptus alkaline hydrogen peroxide mechanical pulp, carried out in the following steps:

[0046] (1) Heat treatment and washing of raw materials: Take the peeled eucalyptus wood that has been stored for 6 months, cut it into eucalyptus chips with a length of 7-45mm, a thickness of 3-7mm, and a width of 5-20mm, heat to 50°C, wash with 85°C water, remove Knots and gravel;

[0047] (2) Pre-steaming: the washed eucalyptus chips are pre-steamed at 85°C for 15 minutes;

[0048] (3) Extrusion and impregnation: Extrude the pre-steamed eucalyptus chips with a wood chip press with a compression ratio of 1:2.8~4, with a torque of 180kNm. The extruded eucalyptus chips can absorb the liquid better due to the sponge effect. After being squeezed, it is immersed in the liquid medicine, and the composition of the liquid medicine is: H 2 o 2 , the dosage is 2% of the weight of the absolute dry wood chips; NaOH, the dosage is 1.6% of the weight of th...

Embodiment 3

[0059] A method for preparing high-bulk eucalyptus alkaline hydrogen peroxide mechanical pulp, carried out in the following steps:

[0060] (1) Heat treatment and washing of raw materials: take 50% of the peeled eucalyptus wood stored for 3 months and 6 months each, cut into eucalyptus chips with a length of 7~45mm, a thickness of 3~7mm, and a width of 5~20mm, and heat them with secondary steam To 55°C, wash with 90°C water to remove wood knots and gravel;

[0061] (2) Pre-steaming: the washed eucalyptus chips are pre-steamed at 90°C for 20 minutes;

[0062] (3) Extrusion and impregnation: Extrude the pre-steamed eucalyptus chips with a wood chip press with a compression ratio of 1:2.8~4, with a torque of 180kNm. The extruded eucalyptus chips can absorb the liquid better due to the sponge effect; Impregnated in the liquid medicine after pressing, the composition of the liquid medicine is: H 2 o 2 , the dosage is 1.9% of the absolute dry wood chip weight; NaOH, the dosage is...

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Abstract

The invention discloses a method for preparing high-bulk eucalyptus alkaline peroxide mechanical pulp. The method includes the steps of raw material heating, washing, pre-steaming, extrusion, steeping, reacting, high consistency refining, bleaching, latency removal, low consistency refining, screening, concentrating, and pulp washing for formation of finished pulp. The method uses eucalyptus as raw material, lowers consumption of NaOH and changes refining ways, and accordingly consumption is lowered, and cost is reduced. In addition, bulk of the eucalyptus alkaline peroxide mechanical pulp is increased from lower than 2.8cm<3> / g to more than 3.5cm<3> / g, and paperboard bulkiness is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of alkaline hydrogen peroxide mechanical pulp, in particular to a method for preparing high bulk eucalyptus alkaline hydrogen peroxide mechanical pulp. Background technique [0002] Alkaline Peroxide Mechanical Pulp (Alkaline Peroxide Mechanical Pulp), referred to as APMP, is an energy-saving and environmentally friendly pulping technology introduced in the 1980s. At the same time, the bleaching process is completed; because no sulfite is used in the pulping process, the waste water does not contain sulfur compounds, and the environmental protection treatment is relatively easy; the number of impregnation stages, NaOH, H can be selected according to the strength and whiteness required by the material type and pulp 2 o 2 It has the outstanding advantages of high yield, high whiteness, high strength and low pollution, and wide adaptability of raw materials. It is a fast-growing and promising chemical-mechanic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
Inventor 钟义昌郑锦国饶建山
Owner GUANGXI JINGUI PULP PAPER
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