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Method for preparing high-yield ecru bamboo pulp through displacement cooking

A technology for replacing cooking and natural bamboo pulp, which is applied in pulp beating/refining method, washing/replacing pulp treatment liquid, non-woody plant/crop pulp, etc., to achieve low production cost, obvious energy saving effect and high yield. Effect

Inactive Publication Date: 2017-12-01
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

[0030] (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;

[0031] (2) Steam pretreatment: After the bamboo chips are steamed into a pot, low-pressure steam is introduced to make the temperature of the top and bottom of the pot reach 120°C, and the temperature is kept at this temperature for 90 minutes.

[0032] (3) Cooking: After completing the steam pretreatment, add the cooking liquid into the vertical cooking pot and use the displacement cooking technology to cook the bamboo slices, using sodium hydroxide and sodium sulfide as the cooking liquid; calculated by sodium oxide, the cooking liquid The amount added is 5% to the weight of the absolute dry bamboo chips, sodium sulfide accounts for 20% in the proportion of alkali, the maximum holding temperature is 105°C, and the holding time is 60 minutes.

[0033] (4) Extrusion: After the cooking is completed, the bamboo chips are sent ...

Embodiment 2

[0039] (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;

[0040] (2) Steam pretreatment: After the bamboo slices are steamed into a pot, low-pressure steam is introduced to make the temperature of the upper and lower parts of the pot reach 140°C, and the temperature is kept at this temperature for 30 minutes.

[0041] (3) Cooking: After completing the steam pretreatment, add the cooking liquid in the vertical cooking pot and use the displacement cooking technology to cook the bamboo chips, using sodium carbonate as the cooking liquid; the amount of sodium carbonate added is 6 to the weight of the absolute dry bamboo chips. %, the maximum holding temperature is 160°C, and the holding time is 10 minutes.

[0042] (4) Extrusion: After the cooking is completed, the bamboo chips are sent to the screw extruder for extrusion and tearing, and the crude color paste with high yield is obtain...

Embodiment 3

[0048] (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;

[0049] (2) Steam pretreatment: After the bamboo slices are steamed into a pot, low-pressure steam is introduced to make the temperature of the upper and lower parts of the pot reach 130°C, and the temperature is kept at this temperature for 60 minutes.

[0050] (3) Cooking: After completing the steam pretreatment, add the cooking liquid in the vertical cooking pot and use the displacement cooking technology to cook the bamboo chips, using sodium carbonate as the cooking liquid; the amount of sodium carbonate added is 4 to the weight of the absolute dry bamboo chips. %, the maximum holding temperature is 155°C, and the holding time is 20 minutes.

[0051] (4) Extrusion: After the cooking is completed, the bamboo chips are sent to the screw extruder for extrusion and tearing, and the crude color paste with high yield is obtain...

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PUM

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Abstract

The invention discloses a method for preparing high-yield ecru bamboo pulp through displacement cooking. By means of improvement, the method comprises the following steps of material preparing, steam pretreating, cooking, shoving, high-concentration pulp grinding, low-concentration pulp grinding, washing and pulp beating. By means of the preparation method, the yield of the obtained pulp ranges from 70% to 90%, the kappa number is 80 or above, the whiteness ranges from 14% ISO to 24% ISO, and the b value ranges from 25% to 40%. According to the method, the displacement cooking technology is adopted, and by means of high-compression-ratio extruding and high-concentration pulp grinding, the preparation process has the beneficial effects that energy saving and environmentally friendliness are achieved, no emission is caused, and the production efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a method for producing high-yield natural-color bamboo pulp by displacement cooking. 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 natural bamboo pul...

Claims

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Application Information

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IPC IPC(8): B27J1/00B27K3/32B27K5/00D21B1/30D21C9/02D21D1/20D21H11/12
CPCB27J1/00B27K3/32B27K5/001D21B1/30D21C9/02D21D1/20D21H11/12
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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