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Preparation method of industrial hemp bark pulp

A technology of industrial hemp and hemp husk, applied in the direction of non-woody plants/crop pulp, etc., can solve the problems that restrict the development pace of the emerging hemp industry, and achieve the effect of high yield, low input and high output

Inactive Publication Date: 2004-02-18
云南工业大麻股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the average production scale of pulping and papermaking in the world relying on hemp husks is only about 5,000 tons per year, which seriously restricts the development pace of the emerging hemp industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Harvested and dried hemp stalks from the field are peeled with a mechanical peeling machine, and the hemp husks are sent quantitatively to the cyclone pulping machine through a transport machine, using a sodium hydroxide aqueous solution with a concentration of 0.1% to 0.4%, and intermittently at ≤75°C. Pulping is carried out in the same way; after pressure sieving, the pulp is stored and refined, and after dehydration, washing, and screw extrusion concentration, the natural color pulp of hemp skin can be obtained.

Embodiment 2

[0019] Harvested and dried hemp stalks from the field are peeled with a mechanical peeling machine, and the hemp husks are sent quantitatively to the cyclone pulping machine through a transport machine, and the sodium hydroxide aqueous solution with a concentration of 0.1% to 0.4% is used at ≤75°C. Pulping is carried out in the same way; the pulp from the pulping machine is directly refined after passing through the pressure sieve, that is, the natural color pulp of hemp skin is obtained. Pulping results: yield greater than 90%, whiteness 30-40%, beating degree 25-40°SR, tear index 13-21mN m 2 / g, tensile index 35-58N·m / g, elongation 1.5-2.8%, opacity greater than 98%.

[0020] Table 1 shows the specific process conditions and pulp quality standards for making the original color paste in Examples 1-2.

[0021] project

Embodiment 3

[0023] project

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Abstract

A process for industrially preparing the hemp skin pulp includes separating hemp skin from hemp stem, loading in cyclone-type separatino-cutting pulping machine for separating fibres for each other and cutting short to become pulp, and bleaching with non-chlorine bleaching agent. Its advantages are high physical strength and no drainage of sewage.

Description

technical field [0001] The invention relates to a pulping method of industrial hemp, more specifically, a production method for preparing hemp color paste and bleached pulp by using industrial hemp plants as raw materials. Background technique [0002] As we all know, hemp husk is the oldest and most excellent papermaking raw material in my country. The inherent advantages of hemp husk fiber determine its important position in the high-grade pulp market. Although hemp husk is a very good raw material for papermaking, it has been restricted for a long time due to the control of hemp cultivation, making it difficult to play its due role in the papermaking industry. [0003] The emergence of industrial giants has made large-scale cultivation of hemp a reality, and the industrial scale of hemp husk pulping and papermaking must also keep up. However, the chemical pulping process and equipment of traditional hemp husks are no longer suitable for this develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12
Inventor 陈克利袁华
Owner 云南工业大麻股份有限公司