How It Works
The vacuum forming process involves heating a plastic sheet while it is held in a frame. When the sheet becomes soft and pliable, the mold is placed directly underneath and slight pressure is applied to seal the plastic to the upper mold edge. A vacuum is then applied through small holes in the mold cavity. The atmospheric pressure forces the softened sheet against the contour of the mold walls. The product solidifies as it cools so it retains the shape of the mold once removed.