Preparation method of industrial hemp full stalk pulp

A technology of industrial hemp and hemp stalks, which is applied in pulp beating/refining methods, pulping with inorganic alkali, non-woody plant/crop pulp, etc. It can solve problems such as complicated processes, waste of resources, and large differences in organizational structure , to achieve the effect of increasing pulp yield, reducing pulp dust, and expanding the application range

Active Publication Date: 2012-08-22
YUNNAN JUHENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To make hemp pulp from hemp husks, it is necessary to peel the hemp first, but the existing hemp peeling machines have disadvantages such as low peeling efficiency and high impurity content in the hemp peeled, which is not suitable for large-scale production
In addition, since the hemp stalk core is about four times that of the hemp husk in the whole hemp stalk, if the hemp stalk core is not utilized, it will cause a great waste of resources
In order to reduce the waste of hemp raw materials, some manufacturers try to peel off the hemp husk and hemp stalk core first, and then use different processes for pulping. Not only is the hemp peeling cumbersome and the quality of the peeling is not high, but also different processes are required for pulping , the process is complicated, more equipment is invested, and the quality of the prepared slurry is also quite different.
Due to the large difference in the organizational structure of hemp husk and hemp stalk core, no one has solved the technical problem of directly pulping hemp whole stalks, so this has always been a blank spot in this technical field

Method used

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  • Preparation method of industrial hemp full stalk pulp

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Effect test

Embodiment 1

[0020] A method for preparing industrial hemp whole stalk pulp, the method steps are as follows:

[0021] (1) Cut the air-dried hemp stalks into small pieces with a length of 10 mm to 30 mm, put them in the retting pool for retting to remove part of the pectin and non-fibrous impurities, and send them to the cooking pot after dehydration;

[0022] (2) The kraft method is used to cook hemp stalks; specifically, caustic soda with 18% weight of hemp stalks and sulfide alkali with 3% weight of hemp stalks are used to cook hemp stalks with water; the liquid ratio during cooking is 1:3, and the heating curve It is: heating time 90min, holding time 120min, maximum temperature 155°C; after cooking, a slurry is obtained;

[0023] (3) After the pulp is washed, it enters the beating unit. The beating unit is a conical refining unit. The beating concentration is controlled at 2%, and the beating degree is ≤40. o SR, fiber wet weight 5.0g; after beating, screen, purify, dehydrate, wash, s...

Embodiment 2

[0025] A method for preparing industrial hemp whole stalk pulp, the method steps are as follows:

[0026] (1) Cut the air-dried hemp stalks into small pieces with a length of 10 mm to 30 mm, put them in the retting pool for retting to remove part of the pectin and non-fibrous impurities, and send them to the cooking pot after dehydration;

[0027] (2) Use the kraft method to cook cannabis stalks; specifically, use caustic soda with 15% weight of hemp stalks and sulfide alkali with 5% weight of hemp stalks, then add water to cook hemp stalks; the liquid ratio during cooking is 1:2.5, and the heating curve It is: heating time 80min, holding time 150min, maximum temperature 150°C; after cooking, a slurry is obtained;

[0028] (3) After the pulp is washed, it enters the beating unit. The beating unit is a conical refining unit. The beating concentration is controlled at 4%, and the beating degree is ≤40. o SR, the fiber wet weight is 8.0g; after beating, it is screened, purified,...

Embodiment 3

[0030] A method for preparing industrial hemp whole stalk pulp, the method steps are as follows:

[0031] (1) Cut the air-dried hemp stalks into small pieces with a length of 10 mm to 30 mm, put them in the retting pool for retting to remove part of the pectin and non-fibrous impurities, and send them to the cooking pot after dehydration;

[0032] (2) Use the kraft method to cook cannabis stalks; specifically, use caustic soda with 22% weight of hemp stalks and sulfide alkali with 2% weight of hemp stalks and add water to cook hemp stalks; the liquid ratio during cooking is 1:4.5, and the heating curve It is: the heating time is 120min, the holding time is 100min, and the highest temperature is 165°C; after cooking, a slurry is obtained;

[0033] (3) After the pulp is washed, it enters the beating unit. The beating unit is a disc refining unit. The beating concentration is controlled at 3%, and the beating degree is ≤40. o SR, the wet weight of fiber is 4.0g; after beating, i...

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PUM

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Abstract

The invention provides a preparation method of industrial hemp full stalk pulp, comprising the following steps of: cutting air-dried hemp stalk into small sections, and retting to remove a part of pectin and non-fiber impurities; charging into a digester after dehydrating, digesting hemp stalk to obtain finished pulp by a sulfate method or a caustic soda-anthraquinone method; washing the finished pulp and beating, wherein the beating concentration is 1%-6%, the beating degree is less than or equal to 40oSR, and the wet weight of the fiber is within the range of 4.0g-10.0g; and screening, purifying, dehydrating, washing, and spirally extruding and concentrating to obtain the true color pulp of the industrial hemp full stalk. The method can be used for preparing the pulp by directly using the industrial hemp full stalk, so that the pulp is directly prepared from the hemp full stalk, and the ecological environment can be importantly improved; therefore, the preparation method is good in application prospect.

Description

technical field [0001] The invention relates to the technical field of pulp preparation for papermaking, in particular to a method for producing pulp by using the whole stalk of industrial hemp as a raw material. Background technique [0002] Hemp is a plant suitable for extensive cultivation in my country. During the whole growth process of hemp, pesticides and herbicides are rarely used, and its fiber output per unit area per unit time is much higher than that of wood. The bast fiber of hemp is excellent Hemp paper produced from hemp is a green and environmentally friendly high-grade paper, which can be widely used in cigarette paper, tea bag paper, tobacco flakes, filter paper, banknotes, bond paper and various high-end packaging materials. [0003] The existing technology of adopting hemp raw material to produce paper pulp mainly utilizes hemp husk to make hemp husk pulp, as Chinese patent CN 1204317C, discloses a kind of preparation method of industrial hemp husk pulp. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21B1/06D21C3/02D21D1/20
Inventor 孙川关庆芳杨杰
Owner YUNNAN JUHENG TECH
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