The key to heating the EPS pre-expander
1. Low pressure must be used for penetration, and high pressure is used for ordinary heat treatment (different high pressure can be set according to the characteristics of raw materials and molds);
2. Be sure to exhaust before penetration, that is, open both steam valves and drain valves, and drain the air and water in the raw materials and the mold cavity through steam. This step can be adjusted appropriately according to the mold temperature, generally as follows: 1～2S;
3. The requirements for steam must be dry, without water or pot water
Otherwise:
1) The penetration time will be very long (equivalent to boiling the mold with high temperature water);
2) The mold is extremely corroded (equivalent to punching the mold with hot water under pressure)
Reasons for the steam with water: the water level of the heat storage tank may be too high or the steam with pot water;