Low-temperature replacement cooking method for bamboo kraft pulp

Abstract

The invention relates to a low-temperature replacement cooking method of bamboo kraft pulp. The method comprises the steps of bamboo chip cutting, screening, re-crushing, washing, water filtering, weighing and calculating, presoaking and charging, warm liquid filling, hot liquid filling, heating and cooking, cold blowing, material taking and the like. A bamboo chip screening device used in the screening step comprises a pair of overturning units, a pair of screening tray conveying units and a receiving unit. The sieve tray conveying units are arranged between the two overturning units, and the receiving unit is arranged between the two sieve tray conveying units. The method is easy to operate and high in product yield, the prepared kraft pulp is low in content of unsteamed products, low in kappa number, good in uniformity, high in strength, high in intrinsic viscosity, high in burst index, high in tensile index, high in tear index, high in mitt folding strength, low in steam unit consumption and low in alkali unit consumption, and the bamboo kraft pulp produced through the method is high in quality and can replace needlebush kraft pulp. The bamboo chip screening device can fully screen out bamboo powder smaller than the preset aperture of the screening tray, and the working efficiency is improved.

Description

Technical field [0001] The present invention relates to a bamboo pulp and paper, particularly to a low temperature displacement bamboo kraft pulp cooking process. Background technique [0002] Kraft pulp is a chemical process for removing lignin from the plant material, the cellulose solution obtained from a plant fiber material, the main component of cellulose and hemicellulose, is a biodegradable environmentally friendly materials. [0003] With the national plastic limit escalating kraft pulp used to replace the production of plastic wrapping paper, paper bags, cartons and other production, supplies more widely used, demand is also growing, while the quality of the kraft pulp increasingly high requirements, in particular high mechanical strength kraft pulp will become a popular material. At present, the domestic high mechanical strength kraft pulp mainly imported softwood European countries, while my country has the world's most abundant bamboo resources, the use of bamboo as ...

AI Technical Summary

Problems solved by technology

[0004] The displacement cooking technology originates from the production of wood pulp. Since the phytochemical structure uniformity of bamboo is much lower than that of coniferous wood, the lignin content of bamboo is lower than that of coniferous wood, and the hemicellulose content of bamboo is much higher than that of coniferous wood. It is directly replaced by wood pulp The bamboo kraft pulp produced by cooking technology has problems such as low yield, high energy consumption, poor uniformity, high chemical consumption, and low mechanical strength. The yield of bamboo kraft pulp produced by the existing technology is about 52%, and the characteristics The viscosity is about 900~1000mL / g, the unit consumption of steam is about 0.7t / adt, and the unit consumption of alkali based on Na2O is about 320kg / adt, which cannot reach the quality of softwood kraft pulp, and the downstream use has limitations

[0005] In the prior art, when bamboo chips are screened, because the conveying volume of bamboo chips is usually large, in the screening equipment, the bamboo powder located in the upper part smaller than the predetermined aperture of the sieve tray is sometimes blocked by the bamboo material located in the lower part and is not screened. It is divided into subsequent processing steps, and sent to the re-shredding machine together with the bamboo chips exceeding the predetermined aperture for re-shredding, and the work efficiency is low

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