What is a bar difference? In the dyeing industry, the color master often asks the operator to make a few more patterns and cut a few more tubes when they are about to come out of the vat. Then the same vat of cloth will often appear. When the cut patterns are not in the same tube, the color will be different. There are some differences. Many times, colleagues who are new to the dyeing industry do not have a comprehensive understanding. So what are strip differences?
The stripe difference refers to the dyeing color difference between the fabrics in the same vat when dyeing the fabrics in the same vat. (also called pipe difference)
Causes for pipe difference
1. Distribution of each pipe Difference in quantity
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 fabric circulation, and the cycle of fabric is determined by cloth speed and cloth length. Cloth speed is determined by air volume and lift. Cloth roller speed control, generally speaking, the same The cloth speed of each tube of the 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 of fabric operation. That is to say, during the dyeing time, the fabric of each tube will There will be a large difference in the number of exchanges with the dye solution, resulting in poor dyeing tubes.
2. Difference in cloth speed
In air flow dyeing, the number of exchanges between dye liquor and fabric is determined by the circulation frequency of the dye liquor and the cloth speed. In dyeing in the same vat, the circulation frequency of the dye liquor in each tube is the same. Therefore, the cloth length of each tube Under basically the same situation, 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. Clogging of the dye liquor nozzle
Severe clogging of the dye liquor nozzle will cause dyeing Unable to continue, this is completely not allowed: 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. When the difference in the amount of liquid sprayed by each nozzle is large, dyeing pipe differences will occur. The reasons for clogging are lint or too much long lint and other debris entering the nozzle and cannot be washed away by the dye liquid.
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:
First, it will affect the atomization effect of the dye solution ;
Second, the dye liquor will leak to the inlet side of the airflow nozzle. If the leakage is serious, it means that the amount of dye liquor participating in the exchange with the fabric in the nozzle system is reduced. This leakage of the airflow nozzles in each tube will cause When the difference in the amount of dye liquor exchanged with the fabric is large, pipe differences will occur.
Measures to prevent dyeing tube defects
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 been changed from The structural design principle takes its balance into consideration, so attention should be paid to adjusting the consistency of the speed of each tube’s cloth lifting roller.
Pay attention to the clogging of the nozzle:
1. During the initial equipment debugging and test run , pay attention to check the nozzle, pay attention to cleaning the pipeline and cylinder several times, and clean the remaining debris due to manufacturing or transportation and installation.
2. The gray cloth should be sewn at the end. At the same time, the plastic or paper label on the cloth should be torn off to avoid the thread or label falling off during the dyeing process, causing the filter, Blockage of pump or dye liquor nozzle.
3. Clean the filter in the filter regularly.
4. During the production process, you should always pay attention to the 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.
5. Be more responsible and observe more.
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