an apparatus and method for continuously stretching a web of thermoplastic sheet into an arcuate form of desired curvature for the manufacture of laminated windshields . the apparatus includes conventional heating rolls , but employs at least two adjustable multispoke pyramids , one hot setting pyramid and one cooling pyramid which are separated by a wall incorporating a folding bar . the method relates to the manufacture of cut shaped blanks wherein hot setting and cooling steps are physically separated . residual snap back after hot setting is released prior to the cooling step .