What problems can occur when color masterbatch is not dispersed properly?

Poor dispersion of color masterbatch shows up as streaks, specks, color swirls, or uneven shading in molded parts. Causes include low let-down ratio (too little masterbatch), incompatible carrier resin, cold screw zones, or short residence time. Streaks often mean the melt didn't shear enough-raise back pressure or screw speed. Specks point to undispersed pigment clumps-check masterbatch quality or increase dosage slightly. (color masterbatch) with high pigment loading disperses easier but needs good mixing. In extrusion, uneven color along the profile signals inconsistent feed-calibrate the doser and check for bridging. Purge thoroughly between colors to avoid contamination. Test parts under different lighting-some defects show only in daylight. Fix dispersion issues early-bad parts waste material and slow production. Good dispersion gives uniform color, better aesthetics, and fewer rejects.