First, the main function of the open cotton machinery is to open and remove impurities. The process of opening and removing impurities of raw cotton is complementary. When the raw cotton is loosened into small cotton bundles, the fibers are separated from the impurities, and the impurity removal is completed by mechanically removing the impurities. In the process setting of the cotton opening machine, the process parameters should be reasonably arranged according to the properties of the raw cotton and the quality of the yarn to avoid excessive damage and fiber breakage and impurity fragmentation, so as to prevent the waste of the spinnable fiber from being wasted.
Second, the opener is divided into two types: free blow opener and grip blow opener according to the open blow state.
III. Evaluation of opening and removing impurities (I) Evaluation method of opening effect
1. Weighing method Take the sample and pick out the cotton block and weigh the average weight of the cotton block. Calculate the weight ratio of the largest and smallest cotton blocks for comparison.
2. The compression method takes a sample into a container of a certain volume and compares the change in compression height after adding a certain pressure.
3. The specific volume method fills the sample in a 5000ML beaker, and then places a 250G plexiglass cover on the sample. After 20 seconds, the number of ticks is quickly continued, and then weighed, averaged, and the specific volume is calculated. The opening degree (no unit) can be obtained by the specific gravity according to the formula (2-4-1).
Opening degree = specific volume × specific gravity (2-4-1)
4. Instrument measurement method A sample of a certain weight is placed in the airflow meter for comparison, and the pressure value is compared, the pressure value is high, and the opening degree is good.
(2) The evaluation of the impurity removal effect is as follows:
1. The rate of falling cotton reflects the amount of cotton falling from the loosening and removing machinery. It is calculated by the test and calculated according to the formula (2-4-2):
Dropping rate = drop weight feed material weight × 100% (2-4-2)
2. The impurity content of the cotton is reflected by the amount of impurities in the cotton. The impurities in the cotton are separated and weighed by the instrument, and calculated according to the formula (2-4-3):
Nodules in the falling cotton = miscellaneous mass in the cotton, weight of the cotton, × 100% (2 - 4-3)
3. The falling rate is also referred to as the amount of impurities removed from the raw cotton raw material, calculated according to formula (2-4-4):
Falling ratio = impurity weight in the cotton feed material weight × 100% (2-4-4)
4. The efficiency of impurity removal reflects the effectiveness of removing impurities, which is related to the impurity content of raw materials and is calculated according to formula (2-4-5):
Removal efficiency = impurity rate of raw cotton × 100% (2-4-5)
5. The fiber content of the cotton is reflected by the amount of good fibers in the cotton. The fibers in the cotton are separated by instrument and weighed according to the formula (2-4-6):
Filament fiber content = drop fiber weight drop weight × 100% (2-4-6)
Second, the opener is divided into two types: free blow opener and grip blow opener according to the open blow state.
III. Evaluation of opening and removing impurities (I) Evaluation method of opening effect
1. Weighing method Take the sample and pick out the cotton block and weigh the average weight of the cotton block. Calculate the weight ratio of the largest and smallest cotton blocks for comparison.
2. The compression method takes a sample into a container of a certain volume and compares the change in compression height after adding a certain pressure.
3. The specific volume method fills the sample in a 5000ML beaker, and then places a 250G plexiglass cover on the sample. After 20 seconds, the number of ticks is quickly continued, and then weighed, averaged, and the specific volume is calculated. The opening degree (no unit) can be obtained by the specific gravity according to the formula (2-4-1).
Opening degree = specific volume × specific gravity (2-4-1)
4. Instrument measurement method A sample of a certain weight is placed in the airflow meter for comparison, and the pressure value is compared, the pressure value is high, and the opening degree is good.
(2) The evaluation of the impurity removal effect is as follows:
1. The rate of falling cotton reflects the amount of cotton falling from the loosening and removing machinery. It is calculated by the test and calculated according to the formula (2-4-2):
Dropping rate = drop weight feed material weight × 100% (2-4-2)
2. The impurity content of the cotton is reflected by the amount of impurities in the cotton. The impurities in the cotton are separated and weighed by the instrument, and calculated according to the formula (2-4-3):
Nodules in the falling cotton = miscellaneous mass in the cotton, weight of the cotton, × 100% (2 - 4-3)
3. The falling rate is also referred to as the amount of impurities removed from the raw cotton raw material, calculated according to formula (2-4-4):
Falling ratio = impurity weight in the cotton feed material weight × 100% (2-4-4)
4. The efficiency of impurity removal reflects the effectiveness of removing impurities, which is related to the impurity content of raw materials and is calculated according to formula (2-4-5):
Removal efficiency = impurity rate of raw cotton × 100% (2-4-5)
5. The fiber content of the cotton is reflected by the amount of good fibers in the cotton. The fibers in the cotton are separated by instrument and weighed according to the formula (2-4-6):
Filament fiber content = drop fiber weight drop weight × 100% (2-4-6)
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