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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1

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

[0018] 2. After measuring the cut pieces, use a belt conveyor to select the steaming bin. After pre-steaming for 10-15 minutes at a temperature of 90-95℃, send it to the continuous steamer for continuous cooking. During the continuous cooking process, press Per ton of absolutely dry material, add 2-2.5% potassium hydroxide, 1.5-1.8% ammonium sulfite and 1.2-1.5% sodium tripolyphosphate, the temperature is 135-140℃, and the cooking time is 95-100min , The ratio of material to liquid is 1:4.5.

[0019] 3. The steamed raw materials are sent to the spiral dehydrator by way of unloading, and the dehydrated materials enter the twin-screw refiner for grinding, grinding, and spinning to obtain coarse slurry.

[0020] 4. The coarse pulp is reversely washed by 4 squeezers to obtain natural flax stalk pulp.

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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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