The HTHP fabric dyeing machine has certain dangers in the dyeing process. In order to ensure its safety, after any high temperature and high pressure dyeing, the steam valve must be closed to interrupt the heat source; then the pressure reducing valve is opened, and the pressure is reduced to 0 MPa. At the same time, the temperature inside the dyeing machine can be lowered to below 85 °C to open the lid.
If the cover cannot be opened under these conditions, the instrument should be checked first to prevent the instrument from malfunctioning and the residual pressure cannot be accurately displayed. Especially for the 68 type high temperature and high pressure dyeing machine, special attention should be paid to it. Dangerous. In addition, although the fabric is in normal operation, if the temperature inside the machine has not risen to 95 °C, please do not close the pressure relief valve, and try to let the air inside the machine discharge out.
Especially the semi-filled HTHP fabric dyeing machine, because the saturated steam pressure inside the machine generally starts to rise when the temperature rises above 99 °C. After the grey cloth enters the machine, it should be heated to 60 ° C for about 10 minutes to remove dust, impurities and part of the slurry on the polyester, which is conducive to further scouring.
In the high-temperature refining, the composition and amount of the scouring agent depend on the staining condition of the grey cloth, generally caustic soda, soda ash and detergent, and if necessary, a high-efficiency detergent. They should be added beforehand and added by the feeding tank; after high-temperature refining, it is not suitable to directly clean and scouring and then fully clean, so that the cloth surface ph value is about 7.