Method for the production of hot-formed and essentially single-material recyclable plastic parts made of polyolefins and / or polystyrene

Abstract

A process for the production of hot-formed and essentially single-material recyclable plastic parts from polyolefins and / or polystyrene is described.According to the invention, in a feeding step, a semi-finished product is fed to a processing section of a production plant and heated in at least one preheating step to a stretching temperature of 80–150°C, and actively stretched in at least one stretching step with a degree of stretching of 1.2–12.0 exclusively in the machine direction, wherein a relaxation step takes place after the at least one stretching step, wherein the semi-finished product undergoes a relaxation of at most 20% in the machine direction, wherein at least one post-heating step takes place simultaneously with or following the relaxation step, in which the semi-finished product is heated to a temperature in the range of 100–200°C, wherein the temperature of successive post-heating steps increases stepwise, and wherein a forming step takes place after the at least one post-heating step, wherein the semi-finished product is formed and thereby quenched to a temperature of at most 40°C.