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A kind of method for preparing high-yield natural bamboo pulp by low-temperature displacement dipping

A technology of natural color bamboo pulp and low temperature impregnation, which is applied in the field of pulp and paper making, to achieve the effects of low energy consumption, low production cost and high processing maturity

Active Publication Date: 2020-03-06
SICHUAN YONGFENG PAPER MAKING JOINT STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Therefore, in many methods, do not have a kind of good quality, environmental protection, economy, the method that is suitable for large-scale production to produce high yield natural color bamboo pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation: Cut the bamboo into rectangular bamboo slices with a length of 20-50 mm and a width of 10-20 mm, wash with water, and set aside;

[0030] (2) Low-temperature impregnation: After the bamboo slices are placed in a natural pot, add warm water at about 60°C to control the liquid ratio of 2.5:1, and add sodium hydroxide at the same time. The amount of sodium hydroxide is 4% of the absolute dry bamboo slices. The steam keeps the temperature in the pot at 90°C and keeps it at this temperature for 6 hours;

[0031] (3) Replacement: After impregnation, pump the softened bamboo slices into the dehydration screw, and add an appropriate amount of spray water to replace the residual alkali in the bamboo slices.

[0032] (4) Extrusion: The dehydrated bamboo chips in step (3) are screwed into the extrusion equipment for extrusion and tearing to obtain natural color coarse pulp, and the pulp concentration after extrusion is 40%.

[0033] (5) Secondary replacement: the...

Embodiment 2

[0036] (1) Preparation: Cut the bamboo into rectangular bamboo slices with a length of 20-50 mm and a width of 10-20 mm, wash with water, and set aside;

[0037] (2) Low-temperature impregnation: After the bamboo chips are placed in a natural pot, add warm water at about 60°C to control the liquid ratio of 3:1, and add sodium hydroxide at the same time. The steam keeps the temperature in the pot at 70°C and keeps it at this temperature for 12 hours;

[0038] (3) Replacement: After impregnation, pump the softened bamboo slices into the dehydration screw, and add an appropriate amount of spray water to replace the residual alkali in the bamboo slices.

[0039] (4) Extrusion: After the dehydration in step (3), the bamboo chips are screwed into the extrusion equipment for extrusion and tearing to obtain natural color coarse pulp, and the concentration of the pulp after extrusion is 35%.

[0040] (5) Secondary replacement: the extruded coarse pulp is adjusted to a concentration of...

Embodiment 3

[0043] (1) Preparation: Cut the bamboo into rectangular bamboo slices with a length of 20-50 mm and a width of 10-20 mm, wash with water, and set aside;

[0044] (2) Low-temperature impregnation: After the bamboo slices are placed in a pot naturally, add warm water at about 60°C to control the liquid ratio of 4:1, and add sodium hydroxide at the same time. The amount of sodium hydroxide is 10% of the absolute dry bamboo slices. The steam keeps the temperature in the pot at 55°C and keeps it at this temperature for 14 hours;

[0045] (3) Replacement: After impregnation, pump the softened bamboo slices into the dehydration screw, and add an appropriate amount of spray water to replace the residual alkali in the bamboo slices.

[0046] (4) Extrusion: The dehydrated bamboo chips in step (3) are screwed into the extrusion equipment for extrusion and tearing to obtain natural color coarse pulp, and the pulp concentration after extrusion is 40%.

[0047] (5) Secondary replacement: t...

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Abstract

The invention discloses a method for preparing high-yield natural color bamboo pulp through low-temperature replacement and dipping. The method comprises the following steps of material preparation, low-temperature dipping, replacement, shoving, secondary replacement and high-concentration defibrination. According to the method for preparing the high-yield natural color bamboo pulp, the yield of the obtained pulp ranges from 80% to 95%, the kappa number is above 80, the whiteness ranges from 10% ISO to 30% ISO, and the b value ranges from 25 to 40. According to the method, the low-temperaturereplacement and dipping technology is adopted, and by means of extruding and high-concentration defibrination, the preparation process has the advantages of saving energy, and being environmentally friendly, low in water consumption and high in production efficiency.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a method for preparing high-yield natural-color bamboo pulp by low-temperature displacement dipping. Background technique [0002] High-yield bamboo pulp mainly refers to the unbleached bamboo pulp obtained by chemical mechanical method, and the yield is generally above 60%. At present, the research on high-yield bamboo pulp at home and abroad is mainly used in the preparation of newsprint, writing paper, liner paper or coated paper as the core layer. It has certain requirements on whiteness to meet the needs of end products. Therefore, the bamboo pulp with high yield is mainly bleached mechanical bamboo pulp. [0003] In recent years, with the deepening of people's understanding of bamboo, the development of bamboo pulp has been continuously intensified, and the concept of bamboo's true color has begun to come into people's sight. The research on na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21B1/30D21C3/02D21C3/22
CPCD21B1/30D21C3/02D21C3/22
Inventor 吴和均曾自银吴和岭陈丙才唐华君杨先兴伍涛李晓琴丁良屏
Owner SICHUAN YONGFENG PAPER MAKING JOINT STOCK
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