Color variation control process for molding plastic and composite multi-color articles

A system for molding multi-colored articles comprising:

• a) molding equipment;
• b) a feeding system capable of individually feeding two or more colored materials to the molding equipment through a single screw feeder;
• c) a process control module programmed to control the feeding system for repetitive delivery of the colored materials to line molding equipment wherein the process control module is programmed to:
• i) specify:
• i) a number of colors to be used in the molded article,
• ii) approximate ratios of the colors in the molded article, and
• iii) the sequence of the colors in the molded article;
• ii) determine a modified total mold volume that is a non-integer multiple of an actual total mold volume associated with the article;
• iii) operate the feeding system to feed the individual colors to the molding equipment in said sequence at said ratios in relation to the modified total mold volume until the volume of individual colors fed to the molding equipment reaches either the modified total mold volume if the modified total mold volume is less than the actual total mold volume, or the actual total mold volume if the modified total mold volume is greater than the actual total mold volume;
• and then
• iv) one of:
• i) repeat said feeding of the individual colors to the molding equipment to fill the actual mold volume if the modified total mold volume is less than the actual total mold volume or to fill a successive actual total mold volume if the modified total mold volume is greater than the actual total mold volume, or
• ii) either (a) re-specify one of said number of colors, said approximate ratios or said sequence, or (b) redetermine said modified total mold volume with respect to the actual mold volume, and then repeat said feeding of the individual colors to the molding equipment.