Morphology And Paper-making Properties Of Chinese Cabbage Fiber

This thesis mainly studied the morphology and paper-making properties of the Chinese cabbage fiber, which was parts of the project"Investigation of Intelligent Structure of Protein-Based Edible Biopolymers (number: 20060717)"that subsidized by Development plan Fund of Jilin Science and Technology office.The Chinese cabbage is the important vegetable in China. Along with the standard of living improving, the consumption of the Chinese cabbage was descending direction in winter. At present, the means of taking the Chinese cabbage had crudity, cooked, pickle, dried food, etc, the more using of it need to open up. Vegetable paper is the ideal packaging material, the Chinese cabbage by way of packaging material, its characteristic was studied which was base on the molding theory of making-paper crafts. It can use the Chinese cabbage to reduce rotten losing and increase economic value.In this experiment, the process of the paper-making mechanism of the Chinese cabbage fiber and its properties was basically studied, the different biology structure of the Chinese cabbage fiber and the plant fiber was analyzed; by the microscope observing, it found the Chinese cabbage was easy to happening fibrillation in the action of wetness and engine force, which showed the Chinese cabbage fiber had the making-paper properties; sodium hydroxide consistency, the proportion of stuff and liquid, temperature and time were analyzed with the influence of hemicellulose extracting rate in extracting fiber crafts, the best crafts term was confirm with the optimized experiments; the Chinese cabbage fiber pulp was studied in the different beating conditions, the beating degree, WRV, average length were determined, and it confirmed the beating mode fit to the Chinese cabbage fiber.1) By the modality anatomy of the Chinese cabbage knowing, its mechanism tissue is little, but the vein fibrovascular system is much. Through contrasting to the plant fiber, there was much mixed cell in the Chinese cabbage fiber.2) By the morphology of the fiber knowing, length, width of the Chinese cabbage fiber were short, but the rate of length and width, wall thickness and cavity thickness, and pliability were good, which show the Chinese cabbage fiber was bad than plant fiber and it made paper little strong, but it was easy to demolish and could save beating time.3) The Chinese cabbage had especially high tendency to fibrillation happened in the action of wetness and engine force. There were little and short fibrillation that stood out the surface of fiber. With the action of force, the Chinese cabbage fiber was expanded and the fibrillation was easy to happen during dipping in sodium hydroxide liquor, which was advantage to fiber and fiber to combine.4) By the composing and chemistry ingredient of the Chinese cabbage fiber knowing, its footstalk comprised the content of the cellulose and the hemicellulose as much as its lamina, which was proportion propriety account for infusibility fiber, but the content of xylogen was few much. It needed to deal with it to suiting the pure fiber of paper-making.5) The influence of the Chinese cabbage hemicellulose extracting rate was studied by the different craft parameters after it dealing with alkali. Through single factor test, when the rate of stuff and liquid were 1:11, sodium hydroxide consistency was 1.0mol/L, the time was 3.5h, the temperature was 45℃, it found the extracting rate of the hemicellulose was better good.6) By the optimized experiments, the best craft conditions of extracting dietary fiber was ascertained, which were 0.5mol/L sodium hydroxide, 2.5h, 45℃, 1:11.7) Through the physics characteristic of the Chinese cabbage fiber was tested, the WHC and SW were good, which showed fiber quality and expanding well and which was little influent by alkali consistency.8) The beating degree was enhanced in different extent by homogenize machine, colloid milling or ultrasonic dealing with the Chinese cabbage pulping, which was the best influent by ultrasonic and got to 350SR; the average length of fiber shear the shortest by colloid milling and was 0.401mm. No matter what was the beating mode, the WRV was high very much. Though the expanding was better, the content of the small fiber was much, which made the combine ability descending between fiber and fiber and was disadvantage to molding.9) In alkali condition, owing to the expanding of fiber being good, the high tendency to fibrillation was enhanced. In short time, the beating degree could got to some extent; at the same time, the average length of fiber was reserved long.10) In high temperature condition, it was disadvantage to the expanding and fibrillation of the Chinese cabbage fiber during the beating process, so it was disadvantage to the enhancing of the beating degree.11) By homogenize machine, colloid milling or ultrasonic dealing with the Chinese cabbage pulping, the WHC of which was respectively 1.05, 1.16, 1.26 times than unsettled ones, the SW of which was respectively 1.07, 1.17, 1.51 times than unsettled ones.12) When the beating degree was lower than 300SR, the length distributing and pulping characteristic of fiber were almost the same, 15% of which was best. With the beating degree being enhanced, the pulping characteristic changed unclearly in 20%. Therefore author thought 10%~15% was fitting. The new ideas of this paper are as following:1) Analyze morphology of the Chinese cabbage fiber;2) Analyze the Chinese cabbage fiber fitting to paper-making properties;3) Analyze the beating properties of the Chinese cabbage fiber in the different conditions.The result of this paper can provide referenced and conclusion for the vegetable paper making the packaging material and producing practically.