Preparation method of hemp husk fibers

A hemp skin and fiber technology, which is applied in the field of hemp skin fiber preparation, can solve problems such as waste and damage to long hemp skin fibers, and achieve the effects of reducing the amount of cooking agent, simplifying process links and equipment, and thorough delignification.

Inactive Publication Date: 2014-04-30
KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current mainstream steaming and bleaching process of hemp stalks, it is necessary to cut them into small pieces of about 20-50 mm when preparing materials, which undoubtedly damages and wastes the long fiber resources of hemp husks.

Method used

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  • Preparation method of hemp husk fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Put the hemp stalks cut into about 1 m into the steaming ball, add the pre-prepared cooking liquid, the solid-liquid ratio is 1:3, and use the chemical method to cook the hemp skin until it is close to or reaches the fiber separation point , wherein the cooking solution contains NaOH with 21% dry weight of hemp stalks, anthraquinone with 0.2% dry weight of hemp stalks, and a closed cooker; when the fiber separation point is reached, 80% of the lignin in the hemp bark is basically removed;

[0037] (2) Rotate the steaming ball idly for 40 minutes, pass in steam to raise the temperature to 160°C, and then keep it warm for 120 minutes, then put the steam in the ball into the dilute black liquor tank and lye tank in the form of small deflation, and start to When the temperature rises, the heating steam ball can also be introduced until the steam in the ball is released to the atmospheric pressure, open the steam ball cover, and rotate the steam ball so that the hemp stal...

Embodiment 2

[0047] (1) Weave the hemp skin peeled off from the hemp stalk into small bundles and put it into steaming balls, add the pre-prepared cooking liquid, the solid-liquid ratio is 1:3.5, and use the chemical method to cook the hemp skin until it is close to or reaches Fiber separation point, where the degree of vulcanization of the cooking liquid is 10%, and the cooking liquid contains an alkali (NaOH-sodium sulfide mixture) of 18% dry weight of hemp skin, and the insufficient water is made up by the warm dilute black liquor after pulp washing , airtight digester, basically remove 90% of hemp bark lignin when reaching the fiber separation point;

[0048] (2) Rotate the steaming ball idly for 20 minutes, pass in steam to raise the temperature to 155°C, and then keep it warm for 210 minutes, then slowly empty the steam in the steaming ball in the form of small deflation, and the exhausted steam is passed into the cooking medicine according to the situation Heating the medicinal solu...

Embodiment 3

[0056] (1) The flax husks separated from the mechanical husks and wrapped into small bundles are put into steaming balls, and the pre-prepared cooking liquid is added with a solid-liquid ratio of 1:4. Or reach the fiber separation point, wherein the cooking liquid contains NaOH with 17% dry weight of hemp skin and 0.2% hydroanthraquinone with dry weight of hemp skin, and the insufficient water is supplemented by warm dilute black liquor after pulp washing, and the airtight cooking device;

[0057] (2) Idling the steamed ball for 15 minutes, passing in steam to raise the temperature to 150°C, and then keeping it warm for 180 minutes, and the subsequent discharging, black liquor separation and washing operations are the same as steps (2) and (3) of Example 2;

[0058] (3) The subsequent process of netting, putting on the shelves, closing the bleaching device, dehumidification, adjusting the dryness of the linen husk, balancing moisture, ozone gas phase bleaching and subsequent b...

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Abstract

The invention discloses a preparation method of hemp husk fibers. Bleached hemp husk fibers which have whiteness exceeding 78% and complete degumming, degreasing, delignification and decoloring are obtained by directly digesting the whole hemp husks or the whole hemp stalks chemically, extruding and washing the whole hemp stalks and directly gas-bleaching the washed strip-shaped hemp husk fibers with ozone. The hemp husk fibers can serve as hemp husk pulp for papermaking after being pulped and cut off, and can serve as hemp husk fibers for spinning after being air-dried. By adopting the preparation method, the hemp stalks and the hemp husks are unnecessary to be sliced, so that the forms of the hemp husk long fibers can be furthest maintained; the aim of bleaching can be achieved by carrying out one-stage bleaching on the hemp husk fibers obtained after digesting with zone; high-concentration shoving and powerful dispersion equipment before conventional ozone bleaching of pulp is not needed; for either the hemp husk pulp for papermaking or the hemp husk fibers for spinning, the preparation method with the characteristics of efficiency, cleanliness, economy, simplicity and directness has important values for processing and utilization of hemp fibers.

Description

technical field [0001] The invention relates to a preparation method of hemp husk fiber, in particular to a method for obtaining high-whiteness hemp husk fiber through chemical cooking of whole hemp husk or hemp stalks and gas-phase bleaching, and belongs to the technical field of papermaking and fiber. Background technique [0002] Since ancient times, many hemp-like fibers, such as hemp, flax and ramie, have played an important role in the processing and utilization of fibers such as textiles and papermaking due to their ultra-long and strong fiber characteristics. However, the hemp stalks used in textile and pulping can only be used due to the cumbersome follow-up delicate treatment (such as degumming, degreasing, decolorization, bleaching, etc.) and the high additional cost brought by a large amount of labor input. It is limited to the consumer fields of some high-end textile and paper products and it is difficult to go to the mass market. [0003] High-end hemp fiber c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/153
Inventor 陈克利董璐佳黄晶晶陈海燕高欣
Owner KUNMING UNIV OF SCI & TECH TECH IND SALES MANAGEMENT
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