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 is being introduced to the European liquid color market at K 2019 by Riverdale Global (Hall 7, Level 1, Stand B35).
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 color is added throughout the cycle. Metering takes place at a faster rate during injection because of the rapid screw movement during that phase.
100% Injection Coloring technology renders unnecessary two conventional solutions to inadequate mixing that pose added cost or complications: the use of an upstream pre-mixer, or overcoloring to compensate for insufficient mixing. Over-coloring adds raw material cost for opaque parts and is generally not possible with translucent parts.
A controller outfitted with 100% Injection Coloring technology is available to liquid color users at no cost from Riverdale Global, which supplies color metering equipment as part of its service to customers.
“100% Injection Coloring technology saves color costs and ensures product uniformity in many molding applications and is particularly valuable when shot size is close to barrel Metering Liquid Color into Molding Machine capacity,” said Paul Maguire, president of Riverdale Global. “With conventional color metering systems, there simply is not enough mixing time in the barrel to color the 25% of barrel content to which colorant has not been added. Over-coloring can usually fix the problem, but not always, and especially not with translucent parts. For these you need to use either a larger machine or an upstream pre-mixer.”
Also exhibiting at K 2019 is Riverdale Globals affiliate Maguire Products, Inc., which is introducing 100% Injection Coloring technology for use with the companys MGF™ gravimetric feeders for dosing pellet masterbatch (Hall 10, Stand A26).