Cast Iron Heater / Cast Iron Electric Heater Applications and Features: Mainly used in the heating device of plastic injection molding machine barrels. It features reasonable structure, attractive appearance, stable performance, fast heating, uniform heat dissipation, good insulation performance, and high voltage resistance.
Cast Iron Heater / Cast Iron Electric Heater Technical Parameters:
1. Leakage current and electrical strength at operating temperature. a) Leakage current (0.5mA b) Electrical strength: 1800V for 1min without flashover or breakdown.
2. Moisture resistance. Placed in a humidity chamber at 20-30°C and relative humidity of 91%-95% for 48 hours without any damage.
3. Tensile strength of lead-out rod. Withstands 70% of the tensile force of the part for 3 minutes without displacement or fracture.
4. Power deviation rate (±5%). 5. Withstands high voltage (1500V).
Cast Iron Heater / Cast Iron Electric Heater Temperature Control
Generally, a thermocouple is used as the temperature measuring element, and a millivoltmeter is used as the temperature control device to control the on/off of the current to the barrel and mold heating rings, selectively fixing the temperature of each section of the barrel and the mold temperature. Table 5 lists the processing temperature ranges for some plastics for reference.
The barrel heating rings are generally divided into two, three, or four sections for control. The ammeters on the electrical cabinet respectively display the current of each section of heating ring. The ammeter readings are relatively fixed. If the ammeter reading is found to be low for a long time during operation, it may indicate a fault in the heating ring, poor contact of the wire, oxidation and thinning of the heating wire, or a burned-out heating ring. These will increase the resistance of the parallel circuit and cause the current to drop.
When the ammeter has a certain reading, you can also simply use a plastic strip to scratch on the outer wall of each heating ring to see if the plastic strip melts, thereby judging whether a certain heating ring is energized or burned out.
