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6 Operating Specifications of HTHP Dyeing Machine

Author:QINSUN Released in:2023-07 Click:66

The dyeing equipment used under high temperature and high pressure is called “HTHP dyeing machine”. There are some risks associated with using the HTHP dyeing machine. The security concerns that need to be taken into account when using it are briefly described below.


1 Open and Closing the cover2 Eliminate blocking cloth3 Refrain from any unauthorized action on any machine part when the temperature is high4 Safety and accuracy in sampling5 Strength of daily maintenance6 Standardized practice and guidance

Opening and closing the cover

The steam valve must be closed first be used to stop the heat source once a high temperature, high temperature, - the pressure die-off is complete. The depressurization valve must then be opened and the lid cannot be released until the Druck fall below 0MPa and the temperature inside the drying machine falls below 85℃.

Under these circumstances, if the lid remains stiff and the device cannot be opened, it is best to check the device first to make sure that it does not break and does not accurately indicate the residual pressure. To avoid danger, do not force the cover open.

Also, even if the cloth feeding machine works normally and the temperature inside the machine has not yet reached 95°C, do not close the relief valve and try not to vent the air inside the machine to the outside. Especially the Semi-Filled Dyeing Machine, because the saturated steam pressure of the machine usually starts to depress when the temperature is 99℃. If the exhaust gas value is too high, a virtual press will be generated in the machine, and the color may also shift slightly, causing an “air wave” in the circulation pump, leading to Sfabric knots and blockages in the machine.

Exclude blocking fabrics

If a HTHP dyeing machine is used incorrectly, there will be variations in the degree of blocking phenomenon, mainly due to the following four reasons:

After the fabric in Once inside the machine, it must move smoothly and slowly for three to five minutes before the door closes and material is fed. Mechanical blockages may occur when Mechanical equipment such as liquid return valves and nozzles have not been modified due to a change in processing styles, and the equipment can be put into service immediately. After entering the machine, some light, thin and high-density textiles such as chun yafang and polyester taffeta will float on the liquid surface and will not sink. By using the full overflow filling method and the influence of the liquid return valve, heat exchanger and filter screen, it can preventss the fabric gets stuck and the cloth clogs. To reduce the knotting that can occur in the fabric, degassing agents can be added to the dyebath to remove air from the fibers. In this case, according to the type of fabric, the right method should be developed and the right tools can be used to avoid mistakes. The operator should still take care to monitor the fabric operation in the dyeing machine after putting the fabric in the machine. If the operation is found to be abnormal, the recoil blocking device should be properly turned off to correct the problem before it gets worse. It is important to check if the foam in the dye bath increases after the fabric is fed into the machine. Inadequate foam suppression can easily result, leading to “air hammer” blocking of the wiper if defoamer is not used or the amount is insufficientnot In order for the foam suppressing effect to be better, the defoamer should be added before the foam is formed during dyeing. Do not tamper with machine parts when the temperature is high

When the temperature inside the dyeing machine exceeds 100℃ during the fabric dyeing process, pressure will be generated inside the machine, which should not be scrubbed with a damp cloth . The glass undergoes significant thermal expansion and contraction due to the temperature difference, which may cause cracks and serious accidents. The shut-off valves at the top and bottom of the water level glass tube should also be closed promptly when the liquor ratio is changed.

Sampling Safety and Accuracy

To match the color of the standard sample, it is best to avoid fabrics containing dyed a double tube, to take a color sample on each tube Multi-tube overflow jet machine. Although eachWhile the tube generally produces a constant color, occasionally there will be color variation between tubes for the reasons listed below.

The length of the cloth in each tube is different. An abnormal heat exchanger cycle exists. Partial clogging is caused by a long period between filter cleanings. The delivery is concentrated and fast.

It is therefore important to monitor whether these components are working regularly during the dayIly production and to correct any problems as soon as they arise. When sampling, the fabric should be pulled out of the dyeing machine, and you should not put your hands into the machine to cut the sample fabric. When you start the machine after sampling, set the machine\'s fabric speed to the slowest setting, and then gradually increase it to avoid unnecessary trouble.

Strengthen daily maintenance.

deThe sealing ring is essential for the daily maintenance of the HTHP dyeing machine, whether it is a small prototype or a large production. Practice has shown that there can occasionally be differences between the cylinders with the same sequence of fabrics and pretreatment. This is mainly due to the different tightness of the individual dryers themselves. The color difference is affected by air leaks at a joint. This also results in a significant waste of thermal energy and may even be dangerous. Therefore, it is vital to improve the drying machine\'s sealing capabilities and make any necessary changes promptly

Check the \"Contrast Table of Temperature and Saturated Steam Pressure Constant\" (see table below) to see if the safety valve, the thermometer and pressure gauge are also normal. If there is onediscrepancy, you must check them immediately to identify the problem and fix it in time.

Avoid dangerous assumptions about the pressure of 0.2 MPa/m^2 based solely on the The thermometer shows a value of 130°C.

Finally, the worn parts should be checked and serviced every month. In addition, the dyeing machine should be overhauled and maintained once a year and refilled with oil once a day. The main device components should also be repaired and maintained once.

Pressure/MPaTemperature/℃0.0099.10.02104.30.04108.90.06113.00.08116.60.10119.90.12123.00.14125.90.16128.60.18131.10.20133 .40. 22135.60.24137.70.26139.70.28141.60.30143.4
Pressure vs. Temperature
Withe level /Ωtemperature/℃100.000103.9010107.7920111.6730115.5440119.4050123.2460127.0770130.8980134.7090138.50100142.29110146.0612 0149.8 2130153.58140157.31150
Thermal resistance of platinum versus temperature

Standardized practice and training

Before starting work, operators of HTHP dyeing machines must undergo training.