Patent ID: 7958915

Claim:
Apparatus for gravimetrically supplying liquid color concentrate from a container thereof directly into the barrel of a plastic resin material molding press or into the barrel of plastic resin material extruder for molding or extrusion of a product exhibiting such color, comprising: a) a scale for continuously measuring weight of a container of liquid color concentrate in the course of pumping liquid color therefrom directly into the barrel of either a plastic resin material molding press or a plastic resin material extruder; b) a variable speed pump for pumping liquid color concentrate from the container directly into the barrel of either a plastic resin material molding press or a plastic resin material extruder in response to changes in sensed weight of the liquid color concentrate container as determined by the scale; and c) a controller for continuously comparing the measured weight of the container of liquid color concentrate to an expected weight of the container of liquid color concentrate based on a desired usage rate of liquid color concentrate by the molding machine or the extruder for the product being molded or extruded and adjusting speed of the pump continuously, in response to the comparison of the measured weight of the container of liquid color to the expected weight of the container of liquid color concentrate, to supply continuously the desired amount of liquid color concentrate to the barrel of the plastic resin material molding press or the plastic resin material extruder to mold or extrude a product exhibiting such color.