Science, Maths & Technology
Vacuum Forming (Thermoforming)
...systems. In plug-assisted forming, the sheet is clamped in place across the female cavity and heated in the normal way. Air is introduced into the cavity and blows the sheet into a bubble. A photocell controls the height and signals the plug to plunge into the plastic sheet. When the plug reaches its lowest position, a vacuum draws the sheet against the mould, or in some...