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Hemp paper-pulp and preparing method thereof

A technology of pulp and hemp, which is applied in the field of papermaking, can solve problems such as increasing difficulty, increasing production costs, and affecting the treatment process of hemp pulp, and achieves the effect of simple process and excellent performance

Inactive Publication Date: 2008-02-27
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hemp paper produced from hemp is a green, environmentally friendly high-grade paper. It is not only an excellent material for the production of cigarette paper, filter paper, banknote and bond paper, high-quality document paper, and handmade paper, but also for the production of tea. , food, medicine, cosmetics and other packaging materials, but the current use of hemp as raw material to prepare hemp pulp is mostly to use sodium sulfide and sodium hydroxide-based sulfate pulp or sodium hydroxide and sodium sulfite during cooking. When using the above two methods to cook hemp pulp, the various materials in the cooking liquid are unstable and cannot play a good role, and the cooked hemp pulp has a low whiteness, and There are many residual impurities such as pectin, lignin, and wax on the hemp fiber in the pulp, which not only reduces the quality of the hemp pulp product, but also affects the subsequent processing of the hemp pulp, increasing the difficulty of the subsequent process. Thereby increasing the material consumption in the preparation process of large bed pulp, increasing the production cost and reducing the production efficiency of hemp pulp

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, prepare the raw materials, screen the hemp, select the hemp that meets the production needs, and prepare the hemp bast that meets the production conditions through cutting, cleaning, and impurity removal, and then cook it in a digester. The amount of dry cannabis is 25%, the liquid ratio is 1:4, and the cooking aids are 2.5% of sodium carbonate relative to absolute dry cannabis, 2.5% of sodium bisulfite relative to absolute dry cannabis, 1.5% of sodium sulfide relative to absolute dry cannabis, and sodium sulfite The relative absolute dry cannabis content is 6%, the temperature is raised to 175°C in 90 minutes, and the temperature is kept at 210 minutes. After the cooking is completed, the residual liquid is released, and the cooked cannabis is rinsed, and then the steamed cannabis is beaten in a beater. The beating concentration is required to be 5%, and beating for 150 minutes until there are no small pulp lumps in the pulp; then the residual liquid is drained, ...

Embodiment 2

[0018] The processing steps adopted in this embodiment are consistent with Example 1, except that the relative absolute dry cannabis content in NaOH is 30% when cooking in the process, the liquid ratio is 1:5, and the cooking aid adopts the relative absolute dry cannabis content of sodium carbonate 4%, 4.5% of sodium bisulfite relative absolute dry cannabis content, 5.5% of sodium sulfide relative absolute dry cannabis content, 6.5% of sodium sulfite relative absolute dry cannabis content, heating time of 60 minutes, holding time of 120 minutes, and the highest cooking temperature of 170°C; The beating concentration is 8%, beating for 120 minutes;

[0019] The performance of the hemp fiber that adopts above-mentioned embodiment to obtain for producing paper pulp is:

[0020] Pulp potassium permanganate value 7;

[0021] Cellulose content 73%;

[0022] Whiteness 55%;

[0023] Beating degree 36°SR;

[0024] Tensile index 49N.m / g.

Embodiment 3

[0026] The processing steps adopted in this embodiment are consistent with Example 1, except that the relative absolute dry cannabis amount in NaOH is 20% when cooking in the process, the liquid ratio is 1: 2.5, and the cooking aid adopts the relative absolute dry cannabis amount of sodium carbonate 5.5%, sodium bisulfite 1.5% relative absolute dry cannabis content, sodium sulfide relative absolute dry cannabis content 4.5%, sodium sulfite relative absolute dry cannabis content 6%, heating time 90 minutes, holding time 280 minutes, cooking maximum temperature 178°C; The beating concentration is 10%, beating for 60 minutes;

[0027] The performance of the hemp fiber that adopts above-mentioned embodiment to obtain for producing paper pulp is:

[0028] Pulp potassium permanganate value 6;

[0029] Cellulose content 76%;

[0030] Whiteness 58%;

[0031] Beating degree 38°SR;

[0032] The tensile index is 48N.m / g.

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Abstract

The present invention discloses a hemp pulp and its preparation method. It is characterized by that it uses hemp plant as raw material, and its preparation method includes the following steps: preparing material, digesting, washing material, beating, removing sand, pulp-making, drying and packing.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a hemp pulp produced by using hemp as a raw material and a preparation method of the hemp pulp. Background technique [0002] Hemp paper produced from hemp is a green, environmentally friendly high-grade paper. It is not only an excellent material for the production of cigarette paper, filter paper, banknote and bond paper, high-quality document paper, and handmade paper, but also for the production of tea. , food, medicine, cosmetics and other packaging materials, but the current use of hemp as raw material to prepare hemp pulp is mostly to use sodium sulfide and sodium hydroxide-based sulfate pulp or sodium hydroxide and sodium sulfite during cooking. When using the above two methods to cook hemp pulp, the various materials in the cooking liquid are unstable and cannot play a good role, and the cooked hemp pulp has a low whiteness, and There are many residual impurities su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/12D21C3/00D21C3/02D21C3/12D21C7/00D21C1/02
Inventor 王乐军李琳张秀梅
Owner CHTC HELON
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