working principle of Thermoforming

1. THERMOFORMING
BY,
ARAVINDKUMAR B

2. THERMOFORMING
 Shaping of hot sheets or strips of thermoplastic material
by mechanical or pneumatic methods.
 The sheets of plastic used in the thermoforming process
are produced by either extrusion, calendaring or
pressing.
 A plastics sheet is clamped into a frame & heated until it
sags.
 Vacuum air or mechanical pressure is applied through
small holes in mould & plastic is pulled against the
 mould.
 The frame is raised & part is removed & trimmed in
punch press.
 It is also called as vacuum forming