In the dyeing industry, fabrics often appear in the same vat. When the cutting patterns are not in the same tube, the colors will have some differences. Many times, colleagues who are new to the dyeing industry do not have a comprehensive understanding, so what is stripe difference? ? The stripe difference refers to the dyeing color difference between the fabrics in the same vat when dyeing the fabrics in the same vat.
1. The difference in the distribution volume of each tube.
In air-flow dyeing, the exchange of dye liquor and fabric is completed in the nozzle system. The frequency of exchange is related to the cycle of the fabric, and the cycle of the fabric is determined by the cloth speed and cloth length. The cloth speed is determined by Air volume and cloth lifting roller speed control. Generally speaking, the cloth speed of each tube of the same machine is basically the same. Therefore, if the cloth length of each tube is too different, there will be a large difference in the cycle period of each tube’s fabric operation. , that is to say, during the dyeing time, the number of exchanges of fabric and dye liquor in each tube will be greatly different, thus causing dyeing tube differences.
2. The difference in cloth speed.
In air flow dyeing, the number of exchanges of dye liquor and fabric is determined by the circulation frequency of the dye liquor and the fabric speed. In dyeing in the same vat, the circulation frequency of the dye liquor in each tube is the same. Therefore, in each When the tube cloth length is basically the same, if the difference in cloth speed is too large, it will cause a large difference in the number of exchanges between the fabric and the dye liquor, resulting in tube differences.
3. The dye liquor nozzle is clogged.
Severe blockage of the dye solution nozzle will cause the dyeing to be unable to continue, which is completely unacceptable: while slight blockage, although it does not affect the continued dyeing, may cause poor dyeing tubes.
Because, under normal circumstances, the caliber and spray volume of each nozzle are basically the same, but if there is a blockage, the spray volume may be different, and the spray volume of each nozzle will vary greatly. Dyeing tube differences will occur.
The cause of clogging is that lint or too much long lint and other debris enter the nozzle and cannot be washed away by the dye solution.
4. Leakage of air flow nozzle.
In the nozzle system, the airflow nozzle is installed on the nozzle seat. After installation, there should be a good seal between the inlet side of the airflow nozzle fabric and the gas-liquid two-phase mixing chamber.
If the sealing is not tight, firstly, it will affect the atomization effect of the dye liquor;
Secondly, the dye liquor will leak to the inlet side of the airflow nozzle. If the leakage is serious, it will This means that the amount of dye liquor exchanged with the fabric in the nozzle system is reduced. When the leakage of the air flow nozzles in each tube causes a large difference in the amount of dye liquor exchanged with the fabric, pipe differences will occur.
Measures to prevent dyeing tube errors
1. In terms of production, attention should be paid to standardized management and scientific Arrange so that the distribution volume of each tube cannot be too different.
2. During operation, pay attention to adjusting the consistency of the cloth speed of each tube. The cloth speed is controlled by the air volume and the speed of the cloth lifting roller, and the distribution of the air volume of each tube has taken into account its balance from the structural design principle. Therefore, attention should be paid to adjusting the consistency of the speed of each tube’s cloth lifting roller.
Pay attention to the clogging of nozzles:
1. During the initial equipment commissioning and test run, pay attention to checking the nozzles and cleaning the pipes and pipes several times. Clean the cylinder body from debris remaining due to manufacturing or transportation and installation.
2. The gray fabric should be sewn to the end, and at the same time, the plastic or paper labels on the cloth should be torn off to avoid clogging of the filter, pump or dye liquor nozzle due to thread ends or labels falling off during the dyeing process.
3. Clean the filter in the filter regularly.
4. During the production process, you should always pay attention to changes in nozzle pressure. If the nozzle pressure increases, it means that the nozzle is clogged, and it should be cleaned in time. The leakage of the airflow nozzle is related to the connection method, sealing structure and installation. If the installation is in place and there is still a large leakage, it means that the sealing and connection structure of the airflow nozzle are insufficient and should be improved and replaced.
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