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Hemp pulp and preparation method

A technology of hemp pulp and hemp pulp, applied in the field of hemp pulp and its preparation, using ramie spinning waste or ramie dry hemp waste to prepare hemp pulp and the preparation field, which can solve the problem of poor fiber cohesion and difficulty in spinning alone , short fiber length, etc.

Inactive Publication Date: 2014-04-30
湖南瑞亚高科集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short fiber length of ramie spinning waste and ramie dry hemp waste (the main length of the fiber is less than 4cm), the fiber cohesion is poor, and it is difficult to spin alone.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of hemp pulp, which uses hemp material as raw material, and is prepared through the steps of cutting, grasping cotton, alkali cooking, beating, bleaching, and papermaking. The quality index of the hemp pulp is: cellulose ≥ 93%, lignin ≤ 0.5% , pectin ≤ 0.5%, iron ≤ 20mg / ㎏, small dust ≤ 150㎜ 2 / ㎏, large dust ≤ 1.5 pieces / kg, polymerization degree 400-600.

[0029] The hemp material described in the present invention is ramie spinning waste or ramie dry hemp waste.

[0030] A preparation method of hemp pulp, which comprises the following steps:

[0031] (1) Cutting: Cut the hemp material into 2.0㎜~20㎜, the better choice is to cut the hemp material into 5㎜~15㎜, and the best choice is to cut the hemp material into 8㎜~10㎜;

[0032] For making full use of raw materials, in step (1) of the present invention, described ramie fiber is ramie spinning waste or ramie dry hemp waste.

[0033] The present embodiment is ramie spinning leftovers, the length of its main fiber ...

Embodiment 2

[0050] In step (1), the ramie fiber is ramie spinning waste, the length of the fiber body is less than 4 cm, and it is cut into 5 mm long segments.

[0051] In step (3), the absolute dry mass ratio of alkaline pectin enzyme solution to raw materials is 1:10, the enzyme activity is 100 u / ml, the temperature is 55°C, the pH value is 9, and the soaking time is 40 minutes; the process conditions of alkaline cooking are: cooking liquid hydrogen The concentration of sodium oxide is 25g / L, the mass ratio of solid to liquid is 1:5, the internal pressure of the cooking ball is 0.6±0.05Mpa, the temperature is 140°C, and the holding time is 80min.

[0052] In step (5), the dosage of hypochlorous acid is 0.7g / L, the temperature is 55°C, the time is 30min, and the pH value is 6.

[0053] The quality indicators of the prepared hemp pulp are: methylcellulose 94.3%, lignin 0.31%, pectin 0.11%, iron 18mg / ㎏, small dust 120㎜ 2 / ㎏, large dust 1.4 pieces / kg, polymerization degree 550.

[0054] T...

Embodiment 3

[0056] In step (1), the ramie fiber is ramie dry hemp waste, the length of the main body of the fiber is below 4 cm, and it is cut into 15 mm long segments by a fiber cutter.

[0057] In step ⑵, the length of the ribs of the bale bale machine is 5mm, the beater speed is 1000r / min, and the negative pressure of the air duct is 4kpa.

[0058] In step (3), the absolute dry mass ratio of alkaline pectin enzyme solution to raw materials is 1:10, the enzyme activity is 100 u / ml, the temperature is 55°C, the pH value is 9, and the soaking time is 40 minutes; the process conditions of alkaline cooking are: cooking liquid hydrogen The concentration of sodium oxide is 25g / L, the mass ratio of solid to liquid is 1:5, the internal pressure of the cooking ball is 0.6±0.05Mpa, the temperature is 140°C, and the holding time is 70min.

[0059] In step (5), the dosage of hypochlorous acid is 0.7g / L, the temperature is 55°C, the time is 30min, and the pH value is 6.

[0060] The quality indicat...

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Abstract

The invention discloses hemp pulp produced by simplified production process steps. The hemp pulp is characterized in that quality indexes of the hemp pulp comprise methyl cellulose of more than or equal to 93 percent, lignin of less than or equal to 0.5 percent, pectin of less than or equal to 0.5 percent, irony of less than or equal to 20 mg / kg, tiny dust of less than or equal to 150 mm<2> / kg, large dust of 1.5 / kg and polymerization degree of 400 to 600. A preparation method comprises the following steps of taking hemp as a raw material, cutting, plucking, alkali cooking, pulping, bleaching and manufacturing paper with pulp. According to the hemp pulp, a plucker is used for the edulcoration and loosening of cut short fibers, so that the process steps are simplified; in addition, enzymes are used for treatment before the alkali cooking, so that the cooking efficiency is improved, and the using amount of alkali is reduced by 20 to 30 percent; the hemp pulp is prepared by completely utilizing ramie spinning leftovers and ramie refined dried-jute leftovers, the fiber number of fibers prepared by the pulp can reach 1.56 to 3 dtex, the number of prepared yarns is greatly increased, the spinnability of the ramie spinning leftovers and the ramie refined dried-jute leftovers is also greatly improved, and benefits of an enterprise are increased.

Description

technical field [0001] The invention relates to the field of chemical fiber production, in particular to a hemp pulp and a preparation method thereof, in particular to a hemp pulp prepared by using ramie spinning waste or ramie refined hemp waste and a preparation method thereof. Background technique [0002] Viscose fiber is a regenerated cellulose fiber. It is made of natural cellulose as raw material, which is made into soluble cellulose sulfonate through alkalization, aging, sulfonation and other processes, and then dissolved in dilute lye to make viscose, which is made by wet spinning. Different viscose fibers can be obtained by using different raw materials and spinning processes. [0003] At present, viscose fiber is produced using cotton linters, coniferous wood, hardwood, bamboo, etc. as raw materials. And because the hemp fiber fabric has better moisture absorption and air permeability than ordinary viscose fiber, its antibacterial and antibacterial properties ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21C5/00
Inventor 蔡亚平陈长青梁丽红
Owner 湖南瑞亚高科集团有限公司