1. Color varies from dark to light, large color difference
Symptom: Products from the same mold have different colors, and batches are unstable.
Cause: The metering screw is worn and the speed is unstable; the proportion setting is incorrect; the masterbatch feeding is sometimes fast and sometimes slow.
Solution: Calibrate the proportion parameters; check and replace the worn screw; clean the feed port to ensure uniform feeding.
2. No feeding or intermittent feeding
Symptom: The masterbatch does not feed, or feeds intermittently.
Cause: The masterbatch absorbs moisture and cakes; bridging occurs in the hopper; the screw is jammed or has residual material.
Solution: Pre-dry the masterbatch; clear the hopper to break arches and prevent bridging; disassemble and clean the screw, and remove accumulated material.
3. Color streaks or uneven color mixing
Symptom: Streaks or mottling appear on the product surface.
Cause: The masterbatch proportion is too low and dispersion is poor; feeding is discontinuous; the screw speed is unstable.
Solution: Slightly adjust the proportion; ensure stable masterbatch feeding; check whether the motor and controller are operating normally.
4. Slow color change and severe color carryover
Symptom: After changing color, the first few shots continue to show color contamination.
Cause: Old material remains in the hopper and screw; material is trapped in dead corners of the machine.
Solution: Thoroughly purge the machine before color change; use purging compound for transition; choose a masterbatch feeder that is easy to disassemble and clean.
5. Inaccurate metering and proportion deviation
Symptom: When set to 1%, the actual color is too dark or too light.
Cause: The screw is worn and the clearance has increased; the controller malfunctions; feeding fluctuates greatly.
Solution: Replace the metering screw; inspect and repair the control panel; ensure smooth masterbatch feeding.
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