In the waste plastic recycling industry, the key to determining the value of end products lies in how to transform molten plastic into granules with uniform appearance and stable performance. The water ring pelletizing line is the mainstream equipment for processing materials such as PE (polyethylene) and PP (polypropylene), favored by recyclers worldwide for their high degree of automation and excellent molding effect.

Working Principle of Water Ring Pelletizer:

• Die-Face Cutting: After the plastic is melted and filtered in the extruder, it is extruded through the die face. A rotating cutter closely adheres to the die face, rapidly cutting the plastic into granules while it is still molten.
• Water Ring Cooling: A high-speed rotating centrifugal water ring surrounds the die face. The cut hot granules are instantly thrown into the rotating water ring under centrifugal force.
• Circulation Conveying: Cooling water rapidly cools and solidifies the granules, then carries them into the dehydration system. During this process, the water does not directly contact the die face, thus ensuring the stability of the die face temperature.

Why Choose Water Ring Pelletizer?

Compared to traditional strand pelletizing, water ring pelletizing offers significant advantages:

• Uniform and Aesthetically Pleasing Particles: Because cutting occurs while the pellets are molten on the die surface, the produced pellets are disc-shaped or spherical, with uniform size and height. These pellets have better flowability, which is beneficial for downstream injection molding or blown film processing.
• High Degree of Automation: Traditional strand pelletizing is prone to “strip breakage” when processing waste materials with uneven quality, requiring frequent manual rewinding. Water ring pelletizing operates automatically after startup, reducing manual intervention.
• Small Footprint: Eliminating the need for a water tank that can stretch for several meters, the overall structure is more compact, making it ideal for production workshops with limited space.
• Uninterrupted Screen Changing: Combined with PURE Machinery’s high-efficiency filtration system, water ring pelletizing enables more stable continuous production.

Highlights of Purui’s Water Ring Pelletizing Technology:

At Purui Machinery, we have optimized our water ring pelletizing machine in several ways:

• Precision Blade Holder Design: Our cutters feature an automatic adjustment mechanism between the cutter and the die surface, ensuring uniform pressure, protecting the die head, and extending blade life.
• Self-Balancing Circulation System: An optimized water ring cover design prevents material blockage caused by localized water flow fluctuations.
• High-Efficiency Dewatering: Equipped with high-speed centrifugal dewatering machine, ensuring extremely low moisture content in the produced granules, suitable for direct bagging and sale or secondary processing.

Water Ring Pelletizer Applications:

• HDPE/LDPE/LLDPE regrind or film recycling.
• PP woven bags, non-woven fabrics, and raffia pelletizing.
• Modified plastics with high filler ratios.

FAQ:

Q1: Is hydrocyclone granulation suitable for PET?

A: Generally not recommended. PET has a high melt flow rate and is usually more suitable for strip cutting or underwater pelletizing. Hydrocyclone granulation is best suited for processing PE and PP.

Q2: How long do the die face and blades last?

A: On clean PE film, our high-hardness alloy die plates can last 12–18 months. We recommend checking blade sharpness every shift.

Q3: Can this system handle high-moisture materials?

A: For high-quality pellets, moisture should be low. If your raw material exceeds 5% moisture, we recommend adding a Purui Squeezer or Horizontal Centrifugal Dryer before the pelletizing stage to ensure solid, high-density granules.

Why Choose Purui Machinery:

With over 25+ years of expertise and a footprint in over 100 countries, Purui Machinery continues to lead the way in plastic regeneration.

Purui Machinery is a high-tech enterprise specializing in the R&D and manufacturing of plastic recycling machinery. Its product portfolio includes plastic pelletizing lines, washing lines, and crushing equipment. Purui is dedicated to providing global customers with the most efficient, reliable, and intelligent plastic regeneration systems.

Contact Us to Get Your Customized Recycling Solution:

E-mail: [email protected]

Tel / Whatsapp: +8617701563079

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