High Frequency Induction Cap Sealing With IGBT heating units
Objective To heat an aluminum foil inside a plastic shampoo cap forĀ sealing
Material 2.0ā diameter, plastic flip top cap, with a 0.9ā diameterĀ aluminum foil seal
Temperature 250 – 300 ĀŗF (120 ā 150 Ā°C)
Frequency 225 kHz
Equipment DW-UHF-7.5 kW, induction heating system, equipped with aĀ remote heat station containing two 1.5 Ī¼F capacitors (totalĀ capacitance 0.75 Ī¼F).
An induction heating coil designed and developed specificallyĀ for this application.
Process A three-turn two-position helical coil is used to heat theĀ aluminum foil in a tunnel style assembly. Product (containers)
passes easily under the induction coil. The assembly is locatedĀ such that the entire perimeter of the aluminum foil is heated
uniformly. The container and cap is placed under the coil andĀ RF power delivered for 0.12 seconds. The aluminum foil heats
and seals to the plastic of the cap.
Results/Benefits This induction heating configuration fulfills the process
requirements and:
ā¢ uses a simple, economical coil design
ā¢ increases throughput with a dual-position coil
ā¢ delivers quality, consistent seals
ā¢ offers a repeatable process, well-suited for automation
