Pelletizing System

Underwater Pelletizing System

COWIN EXTRUSION has the pioneer domestic research and development team for underwater pelletizing systems. With the advanced solutions from home and abroad. and long-term research and development, COWIN EXTRUSION has realized technological innovation and become the leading company that provides high-quality products.

COWIN EXTRUSION has a variety of pelletizing systems: water-cooling strand pelletizing production line, air-cooling strand pelletizing production line, underwater strand pelletizing production line, air-cooling hot face pelletizing production line, water-ring hot face pelletizing production line and underwater pelletizing production line.

The underwater pelletizer system is the latest form of pelletizing in the production of polymers and is the best solution when pelletizing is not possible with drawbars, water rings, etc. COWIN EXTRUSION’s underwater pelletizer system is not only suitable for thermoplastics, but also suitable for all polymers with thermoplastic properties.

Pelletizing System

Processing System

1.Twin screw extruder water-cooling strand pelletizing production line

1.High speed mixer
2.Screw loader
3.Main Feeder
4.Side feeder
5.Glass Fiber
6.Twin screw extruder
7.Water trough
10.Product container


Reinforced modification: PP, PA, PBT, ABS, AS, PC, POM,PPS, PET, PPO, PSF, LCP add. Glass Fiber;
Filling Modification: PE, PP, EVA etc.+ talcum powder, titanium dioxide, carbon black;
Cable material: LDPE, HDPE, LLDPE, MDPE, sheath material, insulating material;
Color masterbatch: PE, ABS, PS, EVA, PET, PP+pigment, additive etc;
Flame retardant masterbatch:PP, PA, ABS, EVA, PBT+ flame retardant, additive etc;
Biodegradable masterbatch: PP, PE, PS+starch, additive etc.

Processing System

2.Twin screw extruder air-cooling hot face pelletizing production line

1.Metering Feeder
2.Twin screw extruder
3.Air-cooling hot-face pelletizer
4.Cyclone system
5.Vibrating Sieve


Enforcing modification: PE, EVA etc.+ CaCO3, Talc, TiO2, Carbon black;
Bidegradable masterbatch: PE, PS etc. +starch, additive etc;
Anti-flame masterbatch: PE, EVA etc. + Sb2O3,Mg(OH)2, Al2(OH)3 etc.

Processing System 3

3.Twin screw extruder water-ring hot face pelletizing production line

1.High speed mixer
2.Main Feeder
3.Side feeder
4.Twin screw extruder
5.Water-ring pelletizer
6.Centrifugal dewatering
7.Vibrating Sieve
8.Product container


PE, EVA etc. Filled with CaCO3, talc, TiO2, carbon black etc.
Cable sheath, cable insulation compounds of LDPE, HDPE, LLDPE, or MDPE;
Radiation-crosslinkable, heat-shrinkable cable compounds;
PPR pipe compounds, PE compounds for crosslinked pipes;
TPR, TPU, TPV thermoplastic elastomers; EVA and hot-melt adhesives;
Color concentrates of PE, ABS, PS, EVA, etc;
Flame retardant masterbatches of ABS, EVA etc;
Masterbatches with PE, PP, PS etc as carriers for degradation applications.


Processing System 4

4.Twin screw extruder under water pelletizing production line

1.Loss-in-weight feeder
2.Material silo
3.Forced feeding
4.Twin screw extruder
5.Diverter valve
6.Screen changer
7.Underwater pelletizer
8.Centrifugal dewatering
9.Vibrating Sieve
10.Product container


PP, PE and its compounds, various of thermoplastic elastomers, PA, TPU, EVA and other hot melt adhesive.
Extensive heat and mass transfer, narrow residence time distribution, large surface to volume ratio, continuous operation. Ideal for high viscosity, high temperature reaction systems.
Continuous polymerization or reactive extrusion like dynamic vulcanization, crosslinking, grafting, and chain extension of PUR, PA, POM, PEI, PC, PMMA, PBT, PPS, etc.

5.Air-cooling strand pelletizing production line

1.High speed mixer

2.Screw loader

3.Main feeder

4.Twin screw extruder

5.Air cooling steel conveyor


7.Vibrating Sieve 

8.Product container


PLA,PBAT,corn starch,cassava and other bio-degradable materials.

High filling masterbatch. For example 90% CaCo3 filler masterbatch.

Other materials not in contact with water.

6.Underwater strand pelletizing production line


2.Twin screw extruder

3.Water flushing trough

4.Special pelletizer

5.Centrifugal dehydrator

6.Vibrating Sieve

7.Product container


Recycling PET.

Recycling materials.

Breakable materials.

What Our Customers Have to Say


TPE Pellets

We received the machine on time. With the help of The After-sales team of COWIN, it has been installed and debugged and put into production, The performance and output of the machine are up to our requirements. Cross-border trade is not easy, but this cooperation has strengthened our interest to cooperate with Chinese manufacturers in the future. Despite the difficulties of the project, Cowin has a good attitude.



Food Pellets

The machine is the same as I excepted. The quality of your product is very competitive on the market. We have cooperated with other Chinese manufacturers before, Your goods are superior in quailty compared with those of other manufacturers. One thing we are not satisfied with that The delivery of cabinet is a bit slow, But the buyers have been helping us track the flow of goods in real time, thank you for your guys efforts.



Single Screw Extruder

In the field of degradable materials, we are still new, but we are very interested in degradable materials, which is a global trend. COWIN friends provided us with the best services and solutions. Even if we had many questions and doubts, COWIN friends answered them one by one. Finally, we cooperated. Thank you very much for this cooperation. This is our first production of degradable materials. I believe we will have more cooperation with you for degradable materials in the future.




Your machine is great and the service is nice. Every time we cooperate with you, we are happy. Even under the influence of COVID, when we urgently need parts, our production is not affected, because you have provided us with sufficient spare parts inventory and delivered goods quickly. We are very grateful. For us, time is money.


Extensive Experience in Applications

Biodegradable Plastic

Biodegradable Plastic

The main target markets for biodegradable plastic are plastic packaging film, agricultural film, disposable plastic bags and disposable plastic tableware.

Colour masterbatch

Colour Masterbatch

The color masterbatch is composed of three basic elements: pigment or dye, carrier and additive. It is an aggregate made by super-constant pigment uniformly attached to the resin, which can be called pigment concentration.

Engineering Plastic

Engineering Plastic

Compared with general plastics, engineering plastics can meet higher requirements in mechanical properties, durability, corrosion resistance, heat resistance and other aspects, and it is more convenient to process and can replace metal materials.


Filler Masterbatch

Filling masterbatch can be used to process plastic films, garbage bags, shopping bags, vest bags, packaging bags, etc. It has good dispersibility, blown film has no white spots and black spots, high fineness to guarantees product gloss and toughness.

LFT-G Impregnation & Extrusion

LFT-G Impregnation & Extrusion

Long-fiber Reinforced Thermoplastic(LFRT),the length of the glass fiber is bigger than 3mm.while the commercialized LFRT is normally 6-25mm.

Non-crystallization dry PET sheet

Non-crystallization dry PET sheet

Non-crystallization dry pet sheet extrusion has following advantage: Use in producing PET / PLA sheets , no need pre-drying crystallization of the energy consumption and adapt to the material for the production of the second , high yield , low energy consumption, high quality plastics characteristics.

Pelletizing System FAQs

A: We are a factory. 20 years experience on extrusion. Leading supplier in Nanjing city.

A: 1 year, Main parts is made of high tool steel by special quenching treatment, with high corrosion resistance and wear resistance.

A: We are a factory. 20 years experience on extrusion. Leading supplier in Nanjing city.

A: 1 year, Main parts is made of high tool steel by special quenching treatment, with high corrosion resistance and wear resistance.

A:Yes, Our technical department can help to analysis, design and test the new products you offered.

A:Experience engineer oversea installation service provided.

A:L/C,T/T,Western union , Paypal.

A:Yes.Before making your decision buying the equipment or not,you can bringsome material here to test-run the equipment.