Meet Global Demands, Present Innovative Solutions
Concentrate on Underwater Pelletizing, Empower Global Plastics
Solving Underwater Pelletizing
Challenges With Innovation
Your Trusted Partner in High-Performance Pelletizing
Pioneering Excellence in Underwater Pelletizing Equipment

Pioneering Excellence in Underwater Pelletizing Equipment
Committed to Best Chinese Underwater Pelletizing Brand

Jiangsu Rongpai focuses on the R&D and manufacturing of underwater pelletizing system with consistent technical innovation and process optimization, combining German advanced technology with years of industry expertise.
With years of study, we have mastered core underwater pelletizing technology with solid engineering experience as well as system integration ability, achieving leading performance in key performance like die plate durability, pelletizing stability, and pellet drying efficiency, being widely used in multiple polymer material processing.
  • 20+

    Years of Industry Experience

  • 100+

    Annual Equipment Sales (Units)

  • 50+

    Professional Technical Staff

  • 11000

    Production Base Area

  • 20+

    Export Countries and Regions

  • Materials can be processed by Underwater Pelletizing Systems:

    Hot melt adhesives, Polyurethane (TPU), Polyoxymethylene (POM), Polyester (PET), Resins (synthetic & natural), Elastomers (TPE, TPV), Polyolefins (PE, PP, POE), Polyamides (PA6, PA11, PA12), Polystyrene (ABS, SAN, PS), Micro pellet materials (PE, PP, PS, EPS), Biodegradable plastics (PLA, PBS), Color masterbatch, and more.
    Plastics & Engineering Plastics
    Commodity Plastics: Polyolefin (PP, PE) pellets, suitable for injection molding, blow molding, and extrusion processes.
    Engineering Plastics: Polyamides (PA), Polyesters (PET), Polyoxymethylene (POM), etc., widely used in automotive, electronics, and home appliances.
    Chemical & Composite Materials
    Reinforced Plastics: Carbon fiber (CFRP), glass fiber (GFRP), and mineral-filled plastics.
    Functional Plastics: Modified materials with flame retardancy, UV resistance, conductivity, and other specialized properties.
    Special Material Applications
    High-Performance Materials: Medical or special plastics suitable for high-viscosity and heat-sensitive processes.
    Functional Masterbatch: Color masterbatch, antibacterial masterbatch, and other additives that impart specific properties to plastics.
    Food & Medical Plastics: High-purity PP, PET for food packaging; PVC and silicone rubber for medical devices.
    Recycled & Eco-Friendly Plastics
    Recycled Plastics: Processing of post-consumer or post-industrial plastics (e.g., PET bottles, HDPE containers) into regenerated pellets.
    Biodegradable Plastics: Materials such as PLA, used for eco-friendly packaging and disposable products.
    01 / 05
    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.
    02 / 05
    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.
    03 / 05
    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.
    04 / 05
    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.
    05 / 05
    Screen Changer
    Removing melt impurities is a critical step before the pelletizing process. The screen changer filters out contaminants in the melt, ensuring material purity, stabilizing production, and improving product quality.
    Underwater Pelletizer
    Pellet Drying & Water Processing Systems
    Melt Diverter Valve
    By-pass
    Screen Changer

    Keep exploring Pelletizing Technology

    With the development of polymer processing, pelletizing process is becoming more efficient, more intelligent, more stable.Underwater pelletizing offers continuous operation, rapid cooling, and uniform spherical pellets, making it a key process for high-quality production with excellent downstream efficiency and adaptability.
    High-Integration, Compact Design

    Rongpai features a highly integrated, compact structure, saving space while enabling efficient operation. This design reduces heat loss, minimizes retention time, simplifies the system, and enhances long-term stability and ease of maintenance.

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    Stable Systems, Lower Maintenance Costs

    Rongpai uses high-quality materials and advanced manufacturing, ensuring long-term stability and fatigue resistance. Rigorous testing and optimized design reduce failures, minimize maintenance, and lower overall lifecycle costs.

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    Excellent Pellet Shape & High Consistency

    Rongpai implements full-process quality control to produce pellets with uniform shape,smooth surfaces, and consistent internal structure. High-consistency pellets enhance downstream processing stability, overall efficiency, and final product quality.

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    Fully Automatic Operation

    Rongpai features a fully automated system with precise sensors and intelligent controls, minimizing manual intervention while ensuring continuous, consistent, and reliable production.

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    High Operational Flexibility

    Rongpai is designed for easy adjustment of production parameters and processes, featuring multiple safety protections and an intuitive interface for quick, easy,safe, and efficient operation.

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    Low Noise & Low Energy Consumption

    Rongpai equipment combines advanced noise reduction and efficient energy management, ensuring a quieter, eco-friendly operation while reducing energy consumption and production costs without compromising performance.

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    Environmentally Friendly

    Rongpai equipment follows strict environmental standards, using clean processes and materials. Emissions, wastewater, and waste are carefully managed to meet regulations, enhancing corporate responsibility while minimizing environmental impact.

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    100+ Strong Partners, Delivering Excellent Service

    Rongpai has established deep collaborations with leading global companies, continuously integrating advanced technologies and management practices. This robust international network enhances our R&D and service capabilities, providing customers with innovative, high-quality solutions that drive success in the global market.
    Partnership with Rongpai
    Starts with a Choice, Goes Beyond Products

    At Rongpai, our relationship with every customer goes far beyond product transactions. Choosing Rongpai is just the beginning of a collaborative journey. With years of R&D experience and deep collaboration with polymer manufacturers, we offer comprehensive capabilities across development, production, and service, providing reliable support to build trust, mutual benefits, and sustainable partnerships.

  • +86 136 5176 6986
  • lironghuai@rongpaiuwp.com