Technical control points for airflow dyeing
(1) Liquor ratio
Strictly follow the cloth weight and process requirements of each tank. This is the basic condition to improve the success rate, and the bath ratio must be reasonably controlled. Different from conventional dyeing, more water is not beneficial to the quality. If the liquor ratio is too high and the water level at the bottom of the dye vat exceeds the Teflon strip, the dye liquor will be in partial contact with the fabric and the cloth will be stained unevenly, which will easily cause color blooming. Therefore, the most economical and reasonable amount of dye liquor is that after the fabric can completely absorb the liquid, there will be a certain amount of excess dye liquor at the bottom of the dye vat for the dye pump to pump and circulate. The amount of water should not be too small during airflow dyeing. If the amount of water is too small, the dye liquor circulation will sometimes be evacuated, the pressure of the differential pressure gauge will be unstable, and it will be easy to stain.
(2) Dyeing formula
Dye formula and conventional dyeing phase The ratio difference is not big. The formula for dyeing polyester fabrics is basically the same. When using reactive dyes to dye cellulose fiber fabrics, the amount of individual dyes can be reduced by 3-5%. The auxiliaries are added according to the concentration (g/l). Since the water volume of the dye liquor is reduced by about 50%, the dosage of auxiliaries is greatly reduced. The heat preservation temperature of airflow dyeing is the same as that of conventional dyeing process, but the heat preservation time is not shortened. Hongqi Chemical believes that the heat preservation time should be appropriately extended based on the actual dyeing effect.
(3) Dyeing process
According to the fabric variety and color Develop reasonable process steps for pre-treatment, washing, dyeing and post-treatment, feeding, heating and cooling curves, etc. for the dyeing materials used.
(4) Feeding
Feeding design of air flow cylinder It works very well. There are two buckets, one for dye and one larger one for adding salt and dissolving. Large amounts of salt and soda ash should be dissolved in the bucket and then added. This is convenient for the operator. The whole package helps The dye can be directly lifted to the grille on the barrel mouth to open the package. After adding, remove the packaging bag. If some debris is accidentally mixed in, it will be blocked by the dye solution filter and will not enter the dye pump, which is beneficial to protecting the dye. pump, reduce its wear, in addition, it can increase the speed of adding additives and promote the uniform mixing of additives and dye liquor, thereby improving level dyeing, reducing dyeing time and increasing output. The dye liquid must be added from the dye barrel, and the water consumption for cleaning the dye liquid barrel must be taken into account in the liquor ratio.
(5) Speed control of fan and cloth lifting wheel
Required According to the fabric material properties, gray fabric specifications and varieties, gray fabric quality, processing requirements, etc., select the appropriate air volume and cloth lifting wheel speed to ensure a reasonable cloth speed. Generally, the cloth speed is 250~380m/min. It is necessary to prevent breakage and ensure Prevent color blooms.
(6)Dye liquor filter and air filter
The dye liquor filter should be removed and cleaned in each tank, and the air filter should be removed and cleaned once a month.
(7) Water quality requirements
Because the nozzle is small, the air flow Dyeing has high requirements on water quality. There should be no sand and impurities in the water to prevent nozzle clogging, resulting in pipe defects and color blooms.
(8) The seam head
should be sewn with a hemming machine Head, don’t tie the connection with a knot.
(9) Identity of fabric material
In the same track Cloths of the same type should be placed inside. If varieties with large differences in weight, width, and material properties are processed together, a tank of cloth will easily produce some defective products.
(10) Equipment maintenance
Refuel the control box regularly. Keep the electrical box and electrical box clean, properly ventilated and cooled, and absolutely prevent water and moisture from entering. The machine must not have any vibration or abnormal noise.
(11) Pay attention to centralized control management
Although each The air flow cylinders are all equipped with program-controlled computers, but to improve product quality and protect the computers of the dyeing machines, it is recommended to use centralized computer management, which can also make it easier to find the causes of quality problems.
(12) Dyestuff and chemical material weighing management
In order to achieve In order to achieve a high first-time success rate in airflow dyeing, it is not enough to have an airflow dyeing machine. The dyeing materials must also be weighed accurately. Computer-aided dye weighing systems and computer-aided additive weighing systems are applied. Only in this way can the accuracy of the process be ensured. Execution, the product has a high success rate and reproducibility. </p
