Molecular orientation for enhanced properties in plastic profile - in which molecular structure is oriented by pressure application on surface during solidification of extruded profile

摘要

The properties of solid or tubular thermoplastic profiles are enhanced using pressure orientation of the molecular structure. Part-crystalline polymer is extruded and undergoes orientation of the polymer chains through stretching flow. During extrudate solidification further molecular orientation is produced by applying a pressure three dimensionally onto the surface of the extrudate at a uniform temp.. Appts. comprises a one piece tool connected to the extruder die and having integral drive units running either towards and/or with the extrudate movement. The drive units make radial contact with the extrudate surface. USE/ADVANTAGE - The process and appts. produce solid or tubular thermoplastic profiles with improved properties in the non-axial direction