Application

Special Material Applications

Rongpai underwater pelletizing systems play a vital role in specialty materials and industrial applications, including high-performance polymers, medical plastics, military-grade materials, cable sheathing compounds, and thermoplastic elastomers (TPE/TPU).
For materials requiring strict heat resistance, chemical resistance, or mechanical performance, underwater pelletizing ensures efficient, stable pellet production and consistent product quality, supporting the development of high-end manufacturing industries.

Underwater pelletizers are used in high-end industries to produce specialized plastic pellets, serving demanding sectors such as medical, military, aerospace, and electronics.

Medical Plastics

Medical-grade PE/PP: Infusion tubes, medicine bottles, medical packaging

Biocompatible plastics (PEEK, PPSU): Implantable medical devices, surgical tools

Antibacterial plastics (Ag⁺-filled plastics): Medical device housings, hygiene products

Special Elastomers & Rubber-Plastic Materials

Thermoplastic Elastomers (TPE, TPU, TPV): Automotive seals, sports shoe soles

Oil- and Wear-resistant Rubber (HNBR, FKM): Industrial seals, aerospace tubing

High-transparency Elastomers (SBS, SEBS): Food-contact materials, medical tubing

Recommendation

Underwater Pelletizer

Rongpai underwater pelletizers are specially designed for producing a wide range of polymer-based thermoplastics, primarily producing spherical pellets, with output up to 12,000 kg/h.

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Pellet Drying & Water Processing Systems

Depending on production requirements, pellet dryers can be installed next to the water tank or independently around the silo, both being practical solutions in actual production.

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Melt Diverter Valve

The melt diverter valve serves as the interface between the underwater pelletizing system and upstream equipment, enabling connection or disconnection of the pelletizing process from upstream processes.

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By-pass

Premature or delayed entry of process water into the cutting chamber can lead to unsuccessful startup or even significant production losses in underwater pelletizing operations.

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