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Drape Forming

The plastic sheet is clamped and heated (A), then drawn over the mold either by pulling it over the mold or by forcing the mold into the sheet and a seal created (8). Vacuum applied beneath the mold forces the sheet over the male mold. By draping the sheet over the mold, that part of the sheet touching the mold remains close to the original thickness of the sheet. Guide walls are formed from the material draped between the top edges of the mold and the bottom seal area at the base. Final wall thickness distribution is shown in the drawing IC).