Abstract: A method of manufacturing thin-walled articles by thermoforming from crystalline thermoplastic sheet or web material wherein the sheet or web is rapidly precooled from extrusion temperature, and the outer surface layers reheated prior to thermoforming.

Abstract: A method for manufacturing thin-walled articles from crystalline thermoplastic material comprising the steps of extruding a continuous web of hot crystalline thermoplastic material at an extrusion temperature above the crystalline melting temperature range of the material, substantially immediately rapidly precooling the opposite surfaces of the web to form therealong thin supportive layers having a temperature in the range wherein the said material is not further plastically deformable and wherein further growth of crystals is essentially avoided, while the hotter core material between said layers is cooled to a temperature adjacent to but above the crystalline melting temperature range and is held in a substantially crystal free condition, transporting the so precooled web into a thermoforming station within a sufficiently short time period to essentially maintain over the web thickness the above mentioned temperature profile produced by precooling, and then thermally forming at a rapid cooling rate said we

Abstract: Laminated material for thermoplstic articles of different shapes is produced by extrusion of thermoplastic synthetic material layers, one of which layer contains a predetermined amount of an adhesive material dispersed within it prior to being extruded, whereby an adhesive bond of predetermined strength is provided between the layers to suit various requirements in use.