MOLDING EQUIPMENT FOR PLASTIC MATERIAL

摘要

PURPOSE:To reduce the mechanical wear and chemical corrosion of the member of the titled equipment by a structure wherein at least one member among members in contact with plastic material is made of ceramics. CONSTITUTION:Fillers violently contact with a nozzle 9 and a nozzle needle 11 due to the high speed turbulent flow of resin of the fillers mixed with the resin at the throttled bore part of the nozzle 9 during injection molding. As a result, wear proceeds on the nozzle 9 and the nozzle needle 11. When the injection molding is stopped, local wear due to sliding contact occurs through the fillers by the intermittent pressing pressure developed with the opening and closing movement of the nozzle needle 11. By employing a ceramic nozzle needle 11 and a ceramic nozzle 9 or by utilizing the wear resistance and high corrosion resistance of the ceramic, the service life of the members of the molding equipment can be prolonged.