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This article explores common causes of die hole blockage in underwater pelletizing systems—especially when processing engineering polymers like PET, nylon, and polycarbonate—and outlines three key strategies to reduce cleaning frequency: automating the startup sequence to avoid premature cooling or smearing, optimizing die heating and insulation to prevent uneven temperature distribution, and maintaining stable extrusion conditions using melt pumps and continuous screen changers. These solutions help ensure consistent pellet quality, reduce downtime, and improve overall production efficiency.
