Method and system for producing pure cotton pulp in dry cutting method

Abstract

The invention discloses a method and system for producing pure cotton pulp in a dry cutting method. The method comprises the following steps: picking cotton, dry cutting, preparing alkali, impregnating, cooking and bleaching, concentrating, pulping, removing impurities, drying the pulp, and molding. The system comprises a cutting device, an impregnating device, a cooking-bleaching device, a concentrating device, a pulping device, an impurity removal device, a pulp drying device and a molding device, which are successively connected with one another. According to the method and system for producing the pure cotton pulp in the dry cutting method, a cooking, bleaching and molding process is completed in one step by cutting the material in a dry cutting method, and the material is first cut off and then is cooked and bleached by virtue of a steam pressure pipe, so that the continuous cooking production is realized, the blocking and intertwining problem of long fibers in screws of a subsequent step is solved, and the production energy consumption is reduced; and the technical difficulty in equipment investment and complexity of operation is alleviated, the quality worsening caused by unreasonable application of medicinal liquid in a production process of fibers is solved, the energy consumption can be reduced by 90 percent compared with the prior art, and high-quality pure cotton pulp can be produced.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a method and a system for producing pure cotton pulp by a dry cutting method. Background technique [0002] The papermaking process is divided into two parts: pulping and papermaking. According to the different process equipment, it can be divided into two methods: steaming first and then cutting and cutting first and then steaming. Intermittent production brings huge cost and labor burden to enterprises. With the requirements of the 12th Five-Year Plan for energy saving and consumption reduction of enterprises themselves and the trend of state subsidies for high-tech and energy-saving enterprises, energy-saving technology reform has become an inevitable direction. [0003] At present, the pure cotton pulp manufacturers in all countries in the world still mainly use the wet cutting process, which requires a lot of labor and electricity, serious environmental poll...

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Problems solved by technology

[0009] Fourth, the production of horizontal tube continuous steaming and bleaching process has a significant increase in output, but the energy consumption is greatly increased. The continuous production of horizontal tube also uses cyclone beater or Dutch beater to cut raw materials

[0010] The above four processes, the first and the second are old-fashioned intermittent production, so I won’t introduce them here, because these two processes are in the catalog of eliminating backward production capacity formulated by the country, and the third one is too low in output and cumbersome to operate. , the quality is not up to standard (the pulp is twisted into a ball when the double helix rotates, which directly affects the production of the subsequent process). The fourth method is the horizontal tube continuous production of cotton pulp, which can ensure continuous production, but in the production process , first cut the raw material (raw material that has not been cooked), it must be pre-infiltrated, and a large amount of caustic soda (NAOH and wetting agent) can be added before it can be cut in the cyclone cutter. However, the study found that the raw cotton that has not been cooked, The pre-invasion is slow, the water absorption is slow, and there is a serious floating state when entering the cyclone type cutting machine, so that it does not sink in the water. The cyclone type cutting machine completes the material cutting through water circulation, and the light water circulation material does not move. The material cutting time is greatly increased, and the first 20 minutes are empty and waiting for the material to sink, and the continuous production investment of the horizontal tube is too large. A set of equipment with an annual production of 10,000 tons needs to invest 8 million US dollars, which is not economical for ordinary enterprises. Strength, that is to say, the development of equipment with relatively small economic investment and production energy consumption to produce higher quality pure cotton pulp will have higher practical value

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