In March 2026, the underwater pelletizing line has been increasingly applied in high-end material fields such as modified plastics, engineering plastics and biodegradable materials, emerging as the mainstream solution for high-end pelletizing thanks to its multiple technical advantages. The core of this technology is that molten plastic is cut in a closed water chamber right after being extruded from the die without contacting air, and then formed into finished pellets through rapid cooling and dehydration, with the whole process completed by multiple coordinated systems. Compared with the traditional strand pelletizing, pellets produced by underwater pelletizing feature smooth surface and uniform particle size, improving the stability of downstream processing. It is suitable for hard-to-process materials like TPU and PLA, reducing thermal degradation and raw material waste. The fully enclosed continuous production mode boasts high automation and stable capacity, and the closed water circulation system makes production more environmentally friendly, meeting the needs of pelletizing scenarios with high environmental requirements. At present, twin-screw underwater pelletizing has become the market mainstream due to its advantages in plasticization and pressure stabilization.
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