Curing plastisol adhesive, ends of filter assembly

Objective

Curing plastisol adhesive on both ends of a filter assembly to create a bond between the filter and end caps 

End Product

Filter assembly

Equipment

• Ambrell 30 kW induction heating system, equipped with a remote workhead containing eight 1.0µF capacitors for a total of 2.0µF

• An induction heating coil designed and developed specifically for this application. 

Materials

End caps 6” (152mm) in diameter, filter and plastisol

Temperature

450 ºF (232 ºC)

Frequency

74 kHz

Testing

A 5’ (1.5m) zig zag shaped coil is used for this curing process. One end cap is filled with 4.3oz (128mL) of plastisol, the filter is placed in the end cap and the assembly is moved over the coil on a sled for a heat cycle of 6 minutes and 40 seconds. When the assembly reaches the end of the run the plastisol is cured. The assembly is flipped over and the 2nd end  cap is filled with plastisol & the filter assembly is placed in the 2nd end cap. The compete assembly is then processed for another 6 minutes and 40 seconds to cure and bond both ends of the filter assembly. 

Benefits

• Improved distribution of heat

• Much faster cure time than heat plates previously used

• Much faster production rate

• Hands-free heating that involves no operator skill for manufacturing 

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