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Ultra-low-alkali removal method for hemp fiber skin and adhesive residue degummed by vapor phase cooking

An ultra-low alkali, hemp fiber technology, applied in the chemical post-processing of fibers, fiber treatment, chemical production of bast fibers, etc. problems, to achieve the effect of easy industrialization, reduce pollution, reduce energy and water consumption

Inactive Publication Date: 2012-10-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] [Purpose of the present invention] The purpose of the present invention is to address the increasing demand for hemp fiber, and the degumming pollution of hemp fiber seriously restricts the development of the hemp spinning industry. glue method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Gas-phase cooking: Soak the ramie fiber raw material in water for 2 hours, put it in a cage, put it into a gas-phase cooking tank, fill it with steam, and steam it for 3 minutes under a pressure of 0.88MPa. Take out from the cooking tank;

[0018] (2) Ultra-low alkali treatment: Soak the ramie fiber after vapor phase cooking treatment in 10-20 times (W / W) 0.05g / L sodium hydroxide solution and treat it at 80°C for 40min, and shake it up and down during the treatment process Hemp fiber, assisting the shedding of hemp skin;

[0019] (3) Post-treatment of ramie fiber: the ramie material after ultra-low alkali treatment is knocked on the knocking machine, the knocking strength is 4-6 turns, after the knocking is completed, soak in 2% fiber emulsified oil at 30°C Finish oiling in 20 minutes, spin dry and air-dry to get ramie fine dry hemp.

Embodiment 2

[0021] (1) Gas-phase cooking: Soak the hemp raw hemp in water for 3 hours, put it in a cage, put it into a gas-phase cooking tank, fill it with steam, and steam it for 6 minutes under a pressure of 0.7MPa. Take out from the cooking tank;

[0022] (2) Ultra-low alkali treatment: soak the hemp fiber after vapor phase cooking in 10-20 times (W / W) 0.1g / L sodium hydroxide solution and treat it at 90°C for 50min. Shake the hemp fiber to assist the shedding of the hemp skin;

[0023] (3) Post-treatment of hemp fiber: the hemp material after the ultra-low alkali treatment is knocked on the knocking machine, the knocking intensity is 4-6 turns, and after the knocking is completed, 30 Soak at ℃ for 30 minutes to complete the oiling, and after drying, dry with airflow to obtain hemp refined and dried hemp.

Embodiment 3

[0025] (1) Gas-phase cooking: Soak flax raw hemp in water for 3 hours, put it in a cage, put it into a gas-phase cooking tank, fill it with steam, and cook it in a gas-phase under a pressure of 1.1MPa for 2 minutes. Take out from the cooking tank;

[0026] (2) Ultra-low alkali treatment: Soak the flax fiber treated by vapor phase cooking in 10-20 times (W / W) 0.2g / L sodium hydroxide solution and treat it at 100°C for 50min, and shake it up and down during the treatment process Hemp fiber, assisting the shedding of hemp skin;

[0027] (3) Post-treatment of flax fiber: the flax material after ultra-low alkali treatment is knocked on the knocking machine, the knocking strength is 4-6 turns, after the knocking is completed, soak in 2% fiber emulsified oil at 30°C Finish oiling in 40 minutes, and dry flax with airflow after drying to obtain flax.

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PUM

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Abstract

Though the bottleneck problems that the traditional hemp fiber chemical degumming causes serious pollution, the energy consumption is high and the development of the hemp spinning industry is restricted can be solved by cleaning and degumming the hemp fiber by vapor phase cooking, the hemp skin remaining on a raw hemp is difficult to remove and subsequent processing of the hemp fiber is influenced as no repeated scouring and rinsing is carried out in the vapor phase cooking degumming process. Aiming at solving the problems, the invention provides an ultra-low-alkali removal method for hemp fiber skin and adhesive residue degummed by vapor phase cooking. The method comprises the following steps: treating the hemp fiber degummed by vapor phase cooking with ultra-low-alkali solution, enabling the hemp skin to fall off by regulating the pH value and rinsing at a certain temperature, simultaneously removing the residual colloid in the vapor phase cooking degumming process, then knocking the hemp, feeding oil, and drying to obtain the high-quality refined dry hemp. The method provided by the invention is efficient, energy-saving and environmentally friendly, and the industrialization iseasy to implement.

Description

technical field [0001] The invention belongs to the field of natural plant fiber utilization, and particularly relates to a method for removing skin and residual glue of hemp fiber degummed by gas-phase cooking with ultra-low alkali. Background technique [0002] There are many kinds of hemp fibers, including ramie, hemp, kenaf, flax, jute, etc., which have been an indispensable means of life for the people since ancient times. In ancient my country, although the sericulture industry originated early, the clothing widely used by the working people was not silk but hemp fiber. There is an item of "hemp" in the "five grains" mentioned by the ancient working people. Hemp fiber has unique advantages, such as good air permeability, fast moisture absorption and dehumidification, antibacterial, anti-static, anti-ultraviolet, etc. With the improvement of people's quality of life, the demand for Gastrodia elata fiber is increasing. [0003] The raw material of natural hemp fiber ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01C1/00D01C1/02
Inventor 陈洪章彭小伟
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI