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Billow-Snap Back-Vacuum Forming

Once the heated plastic is clamped and sealed across the pressure box (A), controlled air pressure applied under the sheet causes a large bubble to form. The sheet prestretches about 35 to 40%. When it is performed to the desired height (B), a mould is forced into it (C) while air pressure beneath the sheet remains constant. When the male mould closes on the pressure box, vacuum behind the mould creates a uniform draw