Patent ID: 7390119

Claim:
A method for supplying liquid color material as a portion of plastic resin material to be further fabricated by molding or extrusion, comprising the steps of: a. serially dispensing liquid color material and resin material into the weigh bin of a gravimetric blender by pumping said liquid color material from a container of the same with a diaphragm pump located in said container according to relative position of a rotatable cam; b. weighing contents of said weigh bin to determine whether there has been a dispense of liquid color thereinto; c. continuing to pump from said container as needed for so long as weighing the contents of said weigh bin indicates there has been a dispense of liquid color material thereinto but stopping said pumping from said container and commencing pumping liquid color material from a second container by using a diaphragm pump located thereon when weighing the contents of said weigh bin indicates lack of dispense of liquid color material thereinto.