Underwater Strand Pelletizer

The underwater strand pelletizer is a new granulation solution designed specifically for high-temperature, high viscosity polymer melts. This system utilizes the principle of fluid dynamics cutting and is widely used in the field of plastic granulation, especially in mixed extrusion production lines. Its unique circulating water support process ensures uniform particle size and high sphericity, making it an ideal choice for handling heat sensitive materials and demanding product purity scenarios.

·Fluid dynamics cutting chamber: using high-speed water flow to lift and assist in cutting the molten strip, greatly reducing the mechanical friction between the cutting blade and the mold surface, and extending the blade life.
·Closed loop water circulation system: The fully enclosed water circuit achieves precise temperature control, effectively preventing oxidation of heat sensitive materials during plastic granulation process and improving particle quality.
·Automatic compression mechanism: maintains constant pressure between the blade and the template, without the need for frequent manual adjustment, ensuring consistent particle size.
·Quick startup and switching: significantly reduces discharge loss during material switching, especially suitable for multi variety and small batch plastic granulation production.

Noted: Details depend on your requirements and need.

Compared with traditional rod granulation or ordinary underwater granulation, the underwater strand pelletizer of Nanjing Kelongwell Chemical Machinery Co., Ltd. has the following significant advantages:
·Better particle quality: By using a water cushion layer to cushion cutting, "tailing" and dust generation are eliminated. The particles have high sphericity and smooth surface, meeting the requirements of high-end injection molding and precision mixing.
·More precise thermal management: The melt immediately enters the circulating water environment after leaving the mold hole, achieving instant quenching, especially suitable for plastic granulation of heat sensitive materials such as TPE, TPU, engineering plastics, etc., effectively avoiding degradation.
·Low operation and maintenance costs: The fluid support structure reduces blade wear by about 40%, making it more durable than traditional underwater pelletizing equipment and significantly extending the lifespan of critical components.
·Strong adaptability of the production line: seamlessly integrated with twin screw extruders, it can form a fully automatic and dust-free plastic granulation production line, and support frequent color changes and high pollution prevention requirements in application scenarios.

·Applicable industries: polymer material blending, color masterbatch production, engineering plastic modification, and biodegradable plastic processing.
·Typical materials: TPE/TPV/TPU (thermoplastic elastomers), PET, PA (nylon) PLA, Hot melt adhesive (HMA), etc.
·Application scenario: Production environments that require quick formula switching, high requirements for particle morphology, and strict prohibition of cross contamination.

Nanjing Kelongwell Chemical Machinery Co., Ltd. can provide comprehensive customized services based on customer production line layout and process requirements
·Customization of mold surface: Design the shape, aperture, and arrangement of mold holes based on the rheological properties of the material.
·Production matching: Provide corresponding specifications of underwater strand pelletizers for extruders with screw diameters ranging from 35mm to 135mm.
·Material upgrade: High corrosion resistant materials such as 316L stainless steel and Hastelloy can be selected to meet the requirements of food contact grade or strongly corrosive material applications.

Q1: What is the difference between a underwater strand pelletizer and a regular underwater pelletizer?
A: Both use water as the medium, but the underwater strand pelletizer adopts the dynamic cutting principle of "water circulation" and is not completely submerged. This design makes the cutting process visible, the startup faster, and the mold surface wear less; Especially for elastic materials that are prone to adhesion, the problem of particles clumping together underwater is avoided.

Q2: Is this system suitable for small-scale plastic granulation production?
A: Very suitable. One of the advantages of the underwater strand pelletizer is the extremely low material loss during start-up, shutdown, and color change. For the production of small batches and multiple varieties of color masterbatch or modified materials, compared to traditional strip granulation, it can reduce about 70% of discharge waste and greatly improve economic benefits.

Q3: What is the particle shape obtained using a underwater strand pelletizer?
A: The particles are in a regular spherical shape with a smooth surface. Due to the cutting action being completed in the water flow, the process of cutting after the molten material is stretched and deformed during the stretching and granulation process is avoided. The particles have high sphericity and uniform packing density, which is conducive to downstream pneumatic conveying and automatic metering.

Q4: What is the cutting effect for high viscosity materials such as TPE and TPU?
A: High viscosity melts are prone to trailing or sticking blades in traditional pelletizing equipment. We effectively reduce the back pressure of the melt by optimizing the temperature field and water flow rate in the heating zone of the mold head, ensuring that the elastic material is cut cleanly and cleanly without entangling the rotor, and the particle cross-section is neat.

Q5: What after-sales services does Nanjing Kelongwell Chemical Machinery Co., Ltd. provide?
A: We provide full technical support from installation guidance, operation training to process optimization, with a 12-month warranty for the entire machine (excluding the cutter rotor and template, but we can provide long-term spare parts supply). We have domestic and overseas reserve warehouses for commonly used vulnerable parts in plastic granulation, ensuring the continuous operation of customer production lines to the maximum extent possible.