Preheating unit 18/24 kW
Certain types of sheet require additional heating on top of the usual heating performed in the thermoforming machine (for example PP). A solution for this matter is the utilization of a preheating unit that is installed between the unwind unit (a special unwind unit with splicing table is required!) and the thermoforming machine. The 18kW preheating unit is advisable for material with < 1,0 mm sheet thickness. The 24kW preheating unit is advisable for material with > 1,0 mm sheet thickness.
Preheating unit highlights
- Compact design with a rigid and sturdy chamber
- Synchronization between preheater and thermoforming machine
- Motor for transporting the sheet is integrated in the preheater
- Smooth running of the sheet by means of frequency inverter
- Alarm indication when plastic reel is empty
The isolated hot-chamber preheating unit consists of a chamber with many rolls, transporting the plastic sheet through the heating chamber. During the long stay in the hot area the tension in the PP sheet relaxes and the temperature of the PP sheet increases. This extra heating of the sheet results in a higher production speed, and reduces the electricity consumption of the thermoforming machine. In this hot-chamber are transport rolls, which transport the sheet continuously through the preheater, synchronically with the speed of the thermoforming machine. This synchronization between the two machines is special developed by MEAF
The air is heated by strong alloy-steel CALROD heaters and air fans distribute this hot air equal through the complete chamber to get everywhere an equal level of temperature. The pre heater is provided with an accurate PHILIPS temperature control and safety device in case of overheating. The speed control of the rollers is by a LENZE frequency inverter for smooth running. The LENZE motor and gearbox are on the outside of the pre-heater. The alarm flash lamp lights when the plastic reel is empty. The unwind part is combined in the preheating unit; so when using a preheating unit, no extra motor driven unwind unit is needed.
Gallery
Quick specs
Heating power PP sheet < 1.0mm
18kW
Heating power PP sheet > 1.0mm
24kW
Sheet transport
Motor with frequency inverter
Max. temperature
up to 140°C
Dimensions 18kW preheater
width: 1167
depth: 1700
height: 2300
Dimensions 24kW preheater
width: 1665
depth: 1700
height: 2300