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Method for preparing flax stem unbleached pulp

A technology of natural color pulp and flax, which is applied in the direction of non-woody plant/crop pulp, textile and papermaking, water/steam pretreatment, etc., can solve the problems of waste of resources, environment, pollution, etc., and achieve high pulping yield and fiber quality Good, highly biochemical 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

Due to the limitation of the papermaking process, most of the flax stalks were burned in vain in the past, which not only wastes resources but also causes environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Cut the flax stalks of the whole plant into 30-40mm sections with a grass cutter, and remove impurities and fines with a cylindrical sieve for later use.

[0018] 2. After the cut material is measured, it is sent to the steaming chamber with a belt conveyor. At a temperature of 90-95°C, after pre-cooking for 10-15 minutes, it is sent to the continuous steamer for continuous cooking. During the continuous cooking process, press Add 2-2.5% of potassium hydroxide, 1.5-1.8% of ammonium sulfite and 1.2-1.5% of sodium tripolyphosphate per ton of absolute dry material, the temperature is 135-140°C, and the cooking time is 95-100min , The ratio of solid to liquid is 1:4.5.

[0019] 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.

[0020] 4. The coarse pulp is reverse washed by 4 presses to obtain the natural color pulp of flax sta...

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PUM

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Abstract

The invention discloses a method for preparing flax stem unbleached pulp. The method comprises the following steps: (1) cutting a flax stem into material segments which are 30-40mm in length with a straw cutter, feeding the material segments into a steaming chamber and precooking the material segments at 90-95 DEG C for 10-15 minutes; (2) feeding the material segments into a digester, adding 2%-2.5% of potassium hydroxide, 1.5%-1.8% of ammonium sulfite and 1.2%-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 95-100 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 flax stem unbleached pulp. Due to the adoption of the method disclosed by the invention, the pulping yield can reach 80%-83%; the mean fiber length reaches 3.26 microns; the BOD / COD ratio of sewage reaches about 0.5; and biochemical treatment is very easy.

Description

technical field [0001] The invention relates to a method for preparing flax stalk natural color paste. Background technique [0002] Flax is an annual herb, which can be divided into three types: flax for fiber, flax for oil and flax for both oil and fiber. The oil type of flax is also called flax, and it is planted in large areas in Inner Mongolia, Shanxi, Shaanxi and Southwest China. Flax seeds contain 32-48% oil, which can be widely used in the production of paints, inks, and edible oils. Although the plants of flax are only 30-60 cm short, the stalks are thick and the bases and parts of the stalks are more branched. Flax stalk is not flax for fiber, but it is an excellent raw material for papermaking (its fibers are strong and soft). Due to the limitation of the papermaking process, most of the flax stalks were burned in vain in the past, which not only wastes resources but also causes environmental pollution. Contents of the invention [0003] The technical proble...

Claims

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Application Information

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IPC IPC(8): D21C1/02D21C1/06D21B1/16D21H11/12
Inventor 腾铁生张跃平
Owner XINJIANG GUOLIYUAN INVESTMENT
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