Method for preparing bamboo willow unbleached pulp

A technology of natural color pulp and bamboo willow, which is applied in the fields of pulping with inorganic alkali, textile and papermaking, fiber raw material processing, etc., can solve the problems of large investment and inability to form commodities, and achieves good fiber quality, cost saving, and easy biochemistry. Effect

Inactive Publication Date: 2015-12-23
XINJIANG GUOLIYUAN INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been 8 years since the introduction of bamboo and willow. With the increase of the planting area, the problem of the future of bamboo and willow is placed in front of the growers. It cannot be just planted and cannot be turned into a commodity! The comprehensive cellulose content of bamboo and willow is as high as 89.8%, and the pulping efficiency of papermaking is extremely high, but the investment in traditional pulping methods is too large, which is not affordable for ordinary enterprises; and the water treatment of existing pulping methods is not good. solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Cut the two-to-three-year-old whole bamboo willow (including branch buds and bark) into 40-50mm long and 3-4mm diameter material sections with a rotary cutter, and use a cylindrical sieve to remove impurities and fines for later use.

[0019] 2. After being measured, the cut material section is sent to the continuous steamer by a belt conveyor for continuous cooking. During the cooking process, 1.5-2% potassium hydroxide, 1.2-1.5% potassium hydroxide, 1.2-1.5% ammonium sulfite and 1-1.5% sodium tripolyphosphate, the cooking material-to-liquid ratio is 1:3.5, the cooking temperature is 135-140°C, and the cooking time is 115-120min.

[0020] 3. The cooked raw materials are sent to the screw dehydrator in the way of unloading, and the dehydrated materials enter the twin-screw refiner for rubbing and separating to obtain coarse pulp.

[0021] 4. The coarse pulp is reverse washed by 4 presses to obtain the natural color pulp of bamboo and willow.

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Abstract

The invention discloses a method for preparing bamboo willow unbleached pulp. The method comprises the following steps: (1) cutting bamboo willows which are two or three years old into material segments which are 40-50mm in length and 3-4mm in diameter with a rotary cutter; (2) feeding the material segments into a digester, adding 1.5%-2% of potassium hydroxide, 1.2%-1.5% of ammonium sulfite and 1%-1.5% of sodium tripolyphosphate on the basis of the oven dry weight of the material segments, and cooking the materials at 135-140 DEG C for 115-120 minutes; and (3) feeding the cooked materials into a twin-screw kneader, carrying out kneading and separating to obtain coarse pulp, and washing the coarse pulp to obtain the bamboo willow unbleached pulp. Compared with a traditional pulping method, according to the method disclosed by the invention, the pulping yield can reach 91%-93%; the length-width ratio of the fiber reaches 49.2; the BOD / COD ratio of sewage reaches about 0.5; biochemical treatment is very easy; and the pulping cost can be reduced by about 1 / 3.

Description

technical field [0001] The invention relates to a method for preparing bamboo and willow natural color paste. Background technique [0002] Bamboo willow is a new willow hybrid variety. Because of its fast growth, high density planting, strong adaptability and excellent material, it has been introduced in a large area from the south to the north of the country. It has been 8 years since the introduction of bamboo and willow. With the increase of the planting area, the problem of the future of bamboo and willow is placed in front of the growers. It cannot be just planted and cannot be turned into a commodity! The comprehensive cellulose content of bamboo and willow is as high as 89.8%, and the pulping efficiency of papermaking is extremely high, but the investment in traditional pulping methods is too large, which is not affordable for ordinary enterprises; and the water treatment of existing pulping methods is not good. solve. Contents of the invention [0003] The techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21B1/16
Inventor 腾铁生张跃平
Owner XINJIANG GUOLIYUAN INVESTMENT
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