Injection molding of colored components mixes at least two pigments with the granules, with measurement of the colored moldings to correct the pigment dosages

摘要

The mixing system for at least two colors (1,2) with at least one raw polymer material, for injection molding of colored moldings, adds them directly to the polymer before or during or after melting. The composition of the components is computed according to the relative spectral remission distribution to give the plastics a defined color value for injection molding. The color of the molding is measured (23) for the actual value to be compared with a nominal value by an algorithm integrated in the control unit (24) to set the color pigment dosing pumps (3,4).