MANUFACTURE OF CYLINDRICAL PART WITH SURFACE TISSUE FROM THERMOPLASTIC RESIN

摘要

In a process for making a rod-like part of thermoplastics material having a profiled surface, for example a gripper rod with a toothed profile as used in a shuttleless loom, heated synthetic resin (3) is introduced into a master mould comprising a matrix (1) and a plug (2) by an injection operation. Formation of the profile and subsequent cooling of the moulded material (3) are carried out in the same matrix (1), using a profiled hobbing plug (2b) under pressure. The molecular chains which have already been oriented in the main direction of stress of the part during the injection operation are made to conform to the surface profile at the embossing stage of the process. This process results in a part having great rigidity and strength due to the increase in its intrinsic strength.