Requirements and process flow for stripping cotton linters Requirements for cotton linters production Composite fabric information

(1) Stripping velvet in separate lanes
According to national regulations, cotton linters are divided into three categories, and each category is divided into 3 grades. The first type of down is generally the first down, the second type is usually the second down, and the third type is generally the third down. Linter of different lengths has different uses. Therefore, the velvet must be stripped in separate lanes, classified, and graded for packaging, so that the various types of linters produced have specified lengths and good quality.
In order to ensure that the length of each layer of lint meets the requirements of the user department, the principle of “light peeling in the first layer, more peeling in the second layer, and strive to peel it off in the third layer” must be implemented.
“Light stripping in the first pass” means that during the stripping process, the short velvet below 13mm is not peeled off in the first pass as much as possible to ensure the length of the first-class velvet and improve its use value. The velvet yield of the first down should not exceed 3 times the lint yield of the cotton seed.
“Two layers of velvet peeling” means two layers of velvet peeling. Erdao velvet is an important raw material for the production of nitrocellulose in the military industry and an important raw material for chemical production companies. The production process of nitrocellulose requires a certain degree of uniformity of short staples. Neither long fibers (above 13mm) nor short fibers (below 3mm) are allowed to account for an excessively large proportion. Generally, the down yield of second-line down is 50% to 60% of the total down yield.
“Strive to strip the cotton in three passes” means to scrape off the short lint on the cotton as much as possible. It is required that the residual lint rate of the cotton after stripping the cotton after three passes should not exceed 4%.
(2) Removal of impurities
If linters contain too many impurities, the use value will be reduced. Especially when linters are used as raw materials in the chemical industry, impurities will have a negative impact on production operations, product quality and production costs. It has a great impact. Some high-end products cannot use short velvet with too many impurities as raw materials.
Therefore, during the stripping process, it is necessary to strengthen the cleaning and lint cleaning, rationally distribute the vehicles, and try to remove impurities in the cotton and linters to improve the quality of the cotton linters. The focus of control should be on removing impurities in the cotton before stripping, and attention should be paid to preventing new impurities from being generated during the stripping production process.
(3) Factor matching
The yield and quality of cotton linters are closely related to the quality status of cotton seeds, and the grade, variety, growth conditions, particle size, maturity, processing method and processing technology of cotton seeds And the difference in machine performance in the previous process will cause great differences in the lint content, impurity content and moisture content of cotton. This requires that during the stripping production process, the equipment should be appropriately adjusted according to the grade, maturity, velvet content, moisture content and other characteristics of the cotton seeds, and the vehicles should be reasonably allocated to improve the quality of cotton linters and thereby ensure Rational use of lint resources.
The key points of sawtooth stripping vehicles are as follows:
1. The distance between the plectrum roller blade and the sawtooth tooth tip
When the cotton seed grade is high, the distance between the plectrum roller blade and the sawtooth tooth tip should be larger (comparable to The standard stipulates that the distance is 2~3mm higher). When the grade is low, the distance should be smaller (can be 2~3mm lower than the standard). When stripping the first down, the distance between the plectrum roller blade and the sawtooth tip should be larger. Peeling the second and third layers When velveting, the distance from the cotton should be smaller.
2. The opening degree of the density board
When peeling off the first down, peeling off low-grade cotton, if you want to reduce the lint yield, or if the cotton is processed for a long time, the opening degree of the density board should be larger; otherwise, it should be smaller; When the sub-roll is tight, the cracking degree of the density board should be larger; when the cotton roll is loose, the opening degree should be smaller.
3. The distance between the cotton seed comb and the rib row surface
When the cotton seed processing amount is large, the distance between the cotton seed comb and the rib row should be larger. When the cotton seed processing amount is small, the distance should be smaller.
4. Weight quality
When the cotton roll density is too loose, the weight weight should be larger; when the cotton roll density is too tight, the weight weight should be smaller.
5. The distance between the center of the weight and the center of the density board axis
When the density of the cotton roll is loose, the distance between the center of the weight and the center of the density board axis should be larger; when the density is tight, the distance should be smaller.
6. Cotton seed roll density
When stripping high-grade cotton seed, the cotton seed roll density can be larger; when stripping low-grade cotton seed, the cotton seed roll density should be smaller; when it is required to increase the cashmere yield, the cotton seed roll density should be smaller. The density can be higher. When reducing the down yield, the cotton roll density should be smaller.
7. The sharpness of the saw teeth
When peeling high-grade cotton, the saw teeth should be sharper. When peeling low-grade cotton, the saw teeth should not be too sharp.
8. Saw shaft speed
When peeling off high-grade cotton, when peeling off the second or third down, the saw shaft speed can be faster; when peeling off low-grade cotton, when peeling off the first down, the saw shaft speed should be appropriate. Slower.
(4) No damage to cotton seeds
Under normal operating conditions of machinery, it is necessary to maintain a certain output and quality, and also to maintain the good condition of cotton seeds, that is, no or less damage to cotton seeds, which is important for seed preservation. Cotton seeds should be given special attention. Excessive damage to cotton seeds will not only damage the cotton seeds themselves, but also reduce the quality of linters due to increased impurities, thereby reducing the use value of cotton linters.
(5) Classification and grading into bales
During the stripping process, due to different grades of cotton seeds, different maturity levels, and different lint yields, the grades of lint stripped out will be different. Therefore, the lint must be peeled according to the different grades. Packaging, storage, and transportation by category and level.
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