SETT FOR ORIENTERING AV MATERIALET I ROR AV PLAST

摘要

Method for orientation of the material of tubes (10) of plastic wherein the plastic tube is passed through a heated jacket tube (12). The plastic tube is held under an internal positive pressure inside the jacket tube is to be exposed to tempering in an initial stage and then to be exposed to orientation in a following wider portion of the jacket tube by the plastic tube being expanded against the tube wall under the action of the internal positive pressure in said latter portion of the jacket tube.