Cable sleeving extruder polymerises extrudate before leaving mould - and adds accelerator after relatively high temperature processing

摘要

The cable sleeving extruder, for polymerised or vulcanised thermoplastics or elastomers, has the extrudate polymerised or vulcanised whilst still in the mould and subjected to punching and/or rotating processes before leaving the mould. As in the main patent. The plastic mass is heated to temperatures above those permissible for the polymerising agent or accelerator but below the extrusion temperature of the material. The polymerising agent is added after the mass has been shaped and is added by injecting under pressure. The advantage lies in polymerising before leaving the mould: the process is suitable even for high melting point materials.