Pelletizing System
There is no perfect pelletizing machine, only the one that is most suited for you. Every compounding process is specific and distinct; our years of experience help to design the right solution for yours.
Six methods compared
Where the pellet is cut, whether it meets water, its shape, and the materials each method suits.
| Method | After the die | Pellet meets water | Pellet shape | Typical materials |
|---|---|---|---|---|
| Water cooling strand | Strand dieWater bathWater wiperCutClassifier | Yes | Cylindrical | Most compounds: engineering plastics, glass fibre reinforced, colour masterbatch |
| Air cooling strand | Strand dieAir cooling conveyorCutClassifier | No | Cylindrical | Materials that must stay dry: PLA / PBAT, starch blends, natural fibre, high filler |
| Under water strand | Strand dieWater slideCutCentrifugal dryerClassifier | Yes | Cylindrical | Recycling with frequent screen changes; PET; glass fibre reinforced PBT / PA |
| Water ring | Die plateCut at die faceWater ringCentrifugal dryerClassifier | Yes | Lens-shaped | PE / PP filler masterbatch, TPV / TPE, EVA, soft PVC |
| Underwater | DiverterDie plateCut under waterWater loopCentrifugal dryer | Yes | Near-spherical | Soft and sticky elastomers, micro-pellets, XLPE, high throughput |
| Air cooling die face | Die plateCut at die faceAir conveying, cycloneVibration cooling conveyor | No | — | PVC, HFFR, WPC, high filler and degradable masterbatch |
The six systems
Die face · under water
Underwater pelletizing
Suitable for most polymers, and especially for TPU, TPV and similar elastomers. More compact than other pelletizers, which shows when the output is large, and the size of the final pellets is controlled in a finer manner.
Underwater Pelletizing System
Strand · water bath
Water cooling strand pelletizing
Suitable for most polymer compounding production. Simple structure, easy operation and convenient maintenance.
Water Cooling Strand Pelletizing System
Strand · water flow
Under water strand pelletizing
For plastic recycling which needs to change the filter frequently. The strands go into the pelletizer automatically by the water flow, with almost no waste.
Under Water Strand Pelletizing System
Strand · dry
Air cooling strand pelletizing
Behind a single stage extruder, for recipes such as PP-based filler, degradable compounds and WPC that are too tenacious to be cut by the air cooling die face pelletizer. The material does not encounter water.
Air Cooling Strand Pelletizing System
Die face · dry
Air cooling die face pelletizing
Behind a tandem compounder, for PVC, LLDPE, high filling masterbatch, degradable masterbatch, HFFR and WPC. The material does not encounter water.
Air Cooling Die Face Pelletizing System
Die face · water ring
Water ring pelletizing
For recipes such as PE, PS, EVA and TPU. The final pellet looks nicer and has good flowability, and the line is shorter than that of strand pelletizing.
Water Ring Pelletizing SystemWhere pelletizing sits in the line
- 01FeedingVolumetric or loss-in-weight
- 02ExtruderTwin, triple, tandem or single screw
- 03Melt filtrationScreen changer, melt pump
- 04PelletizingSix methods
- 05Dewatering and classifyingDryer, vibrating classifier
- 06Conveying and storageBlower, silo
- 07PackingBags or jumbo bags
Control system: one recipe and one start and stop sequence for all stationsControl system
Extruders in front of it
PageTwin screw extruders MachineTandem Extrusion System MachineSAT-T Triple Screw MachineSingle Screw Extruder
Get a quote
Tell us the material, the output and the pellet you need. We recommend the pelletizing method and configure the system.
- 01Material, formulation and target output
- 02Pellet shape and size; whether the material may meet water
- 03Pelletizing method, configuration and quotation
Souder Chen
Head of Compounding Division
With USEON since 2008. Twin screw compounding, devolatilization and recycling lines.