New Dosing Technology for Injection Molding Ensures Uniform Color Without Pre-Mixing and Ends Over-Coloring
100 % Injection Coloring™ Technology from Riverdale Global Meters Liquid or Pelletized Colorant during Both Injection and Recovery Phases
A patent-pending color metering control system for injection molding ensures color uniformity and saves costs by dosing colorant during the injection phase , when conventional color and additive metering systems are inactive . The technology will be introduced to liquid color users at NPE2018 by Riverdale Global ( Booth S22023 ) and is expected to be adapted for solids-metering systems from affiliate Maguire Products , Inc .
During the injection molding cycle , about 75 % of virgin resin enters the screw during the screw recovery phase and 25 % during injection . Because conventional metering systems add color only during recovery , insufficient mixing can occur , which is particularly problematic when shot size approaches screw capacity or when the end product is translucent . In the new 100 % Injection Coloring™ system , a special controller receives signals from the processing machine for both phases , ensuring that
34 TUBE NEWS EVENTS April 2018