Cooling vacuum formed parts
May 2006
Pneumatics & Hydraulics
A manufacturer of major appliances vacuum forms the plastic interior shell of refrigerators. The deep draw of the plastic and complex geometry left the corners very thin. The corners would often tear during assembly or bulge when the insulation was inserted between the shell and exterior housing, resulting in a high rejection rate.
Exair vortex tubes were positioned to cool the critical corner areas just prior to forming the plastic sheet. By cooling these areas, less stretching of the plastic occurred which resulted in thicker corners.
Rejected parts become very costly, especially when expensive materials and slow process times are involved. The cold air from the Exair vortex tube is just the solution for big problems like this one. Exair vortex tubes can supply 'instant' cold air down to -46°C from an ordinary compressed air supply. Along with cooling other vacuum formed parts such as spas, bathtubs, crates, and rubbish bins, the device is suitable for cooling hot melts, ultrasonic welders, environmental chambers etc.
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