Vacuum forming

• A mould of the shape required is placed in a vacuum forming machine then a thin sheet of plastic is clamped above it.
• The sheet is then heated and the mould is forced into the heated sheet.
• The air is vacuumed out of the space between the plastic and the mould, allowing the plastic to take the shape of the mould.
• Once cooled, a small burst of air is pumped into the space to help release the mould from the plastic.