Underwater pelletizing system

China’s leading underwater pelletizing machine manufacturer

As a professional underwater pelletizer manufacturer, we can help you get the equipment that meets your needs. Our underwater pelletizing system can be customized to fully automated underwater pelletizers according to your production needs. Contact us now! Get the best price.

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Underwater pelletizer solutions

We have launched more than 100 compound production lines equipped with underwater pelletizing systems, with complete solutions.

Adaptable to various types of raw materials, no need for frequent debugging

From low-viscosity PE, PP to high-viscosity PA, PC, and even modified materials with glass fiber and fillers, stable pelletizing can be achieved by adjusting the water temperature and cutter speed, eliminating the tedious parameter debugging of traditional equipment when changing materials.

Parameter visualization, simple operation

Equipped with an automated operating system, it only requires simple configuration to use when changing materials, and novices can quickly get started within a week.

Stable pelletizing accuracy and flawless appearance

The entire underwater pelletizing process is completed in water circulation. The knife pellets fit tightly with the template. The particle size deviation can be controlled within ±0.1mm. The surface is smooth and burr-free, solving the "sticking and irregular-shaped pellets" problem of traditional air-cooled pelletizing, and directly meeting the raw material requirements of high-end injection molding and extrusion.

Simple maintenance

Key components (cutter, template, filter) adopt quick-disassembly design, daily cleaning and replacement only require 1-2 people to operate, maintenance time is reduced by 60% compared with traditional equipment, reducing downtime losses.

Intelligent protection in place, safer operation

Equipped with multiple alarm devices such as abnormal water temperature, overload, and water outage, it automatically shuts down for protection in case of abnormality, avoiding equipment damage and personnel safety risks, and complies with ISO safety standards.

Underwater pelletizing system for sale

UET TECH underwater pelletizing system has high quality and performance, it is your best choice

Co rotating screw extruder underwater grain cutting production line / pelletizer

The co-rotating screw underwater pelletizing line launched by UET TECH is a practical solution in the field of recycled material processing. This system is designed to turn recycled plastics into high-quality thermoplastic pellets. It can stably process common recycled materials such as PE, PP and ABS, as well as modified materials with fillers.

Screw diameter (mm) : 45-80

Aspect ratio: 30-56 / 38-68

Speed (r/min): 450 – 650

Power (kW): 37 – 160

Output (kg/hour): 150 – 250 / 220 – 400 / 320 – 550

UET TECH Underwater Pelletizer Specifications

Model	Diverter Model	Hole No.	Knife No.	Knife Movement System	Water System	Output Capacity
HWP200	D28	15–20	4–5	Manual	W200	100–220 kg/h
HWP400	D38	30–40	6–7	Pneumatic	W400	300–450 kg/h
HWP800	D48	50–60	8–10	Pneumatic	W800	600–850 kg/h
HWP1500	D58	80–100	12–14	Hydraulic	W1500	1200–1600 kg/h
HWP2500	D68	120–150	16–18	Hydraulic	W2500	2000–2800 kg/h
HWP4000	D85	180–220	20–24	Servo Hydraulic	W4000	3500–4200 kg/h
HWP6000	D100	250–300	26–32	Servo Hydraulic	W6000	5000–6500 kg/h
HWP10000	D140	400–500	36–45	Servo Hydraulic	W10000	8000–10000 kg/h

Underwater pelletizer and other applications

Masterbatch

Thermoplastics

Hot melt adhesive

Biodegradable materials

UET TECH Underwater Pelletizer Expert Guide

As a manufacturer of underwater pelletizing systems, we often receive various questions from customers when purchasing underwater pelletizing machines. We have sorted out the most frequently asked questions and hope to answer your questions.

What materials are suitable for the equipment?

Our underwater pelletizer can process thermoplastic resins such as PP, PE, EVA, nylon, polycarbonate, and filler materials such as glass fiber and calcium carbonate.

How to choose the underwater pelletizer model that suits you?

Match the model according to the target output:

Small and medium scale (100-850 kg/h): HWP200-800 series, manual/pneumatic control is suitable for multi-variety switching;
Large scale (1.2-10 tons/h): HWP1500 and above models, hydraulic/servo system ensures high-speed and stable cutting (speed ≤650 rpm).

How long is the tool life?

Tool life depends on material properties and production load:

General resin: Each set of tools can run 2000-3000 hours
Abrasive materials: Life is shortened to 500-800 hours, it is recommended to choose titanium carbide composite tools.

Does the equipment have an advantage in energy consumption over traditional pelletizing methods?

Compared with strand pelletizing, the energy consumption is reduced by 15-30%, mainly due to:

Integrated cooling system: cutting and cooling are completed simultaneously, without additional air cooling;
Efficient transmission: the servo hydraulic system (HWP4000 and above) optimizes the motor power output, and the power consumption per ton of product is about 25-40 kWh.

What does after-sales service include?

Warranty period: 1 year warranty for core components (screw, template), 3 months warranty for wearing parts (knife, seal);
Response time: Arrive at the site within 48 hours, provide lifelong technical support;
Preventive maintenance: 1 free comprehensive inspection per year, including template wear analysis and control system calibration.

Can the equipment be exported to Europe and America? Does it meet local standards?

Yes. All our equipment has passed CE certification, the electrical system complies with UL standards, and the voltage (220V-480V) and plug type can be customized according to the exporting country. The export packaging uses rust-proof wooden boxes with a full set of English technical documents to meet customs clearance requirements.

What is the maintenance cost after the warranty period?

The annual maintenance cost is about 3%-5% of the total equipment price, including wearing parts (knives, seals) and routine maintenance. We provide spare parts at lifetime cost price, and can also sign an annual maintenance contract (cost is about 2% of the equipment price), including regular inspections and emergency repairs.

UET TECH provides advanced underwater pelletizing machine solutions

UET TECH underwater pelletizing system is widely used in the plastic pelletizing industry, supporting 90% of plastic compounding and pelletizing. Our advanced automation system has functions such as automatic pelletizing, parameter adjustment, automatic alarm, etc., and can process various polymers. Contact us! Get the perfect solution.

70 +

Sales countries

1990 +

Serve customers

5 +

Years of experience

14900 +

Factory building area

What Our Client Says

Our underwater pelletizing system has been recognized by many customers

We often have to change colors and materials in our workshop. In the past, we had to stop for at least 1 hour for each change. Now we use your HWP800, and the pneumatic tool holder is very fast to adjust. We can produce qualified materials in 40 minutes after changing colors, and we can run two more batches of work a day. The cleanliness of the particles is also reassuring. Last month, a third-party testing agency came to check and found that the heavy metal and impurity content was far lower than the EU food contact material standards. Now customers in France and Spain directly ask for our materials, and the orders are scheduled until next year.

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Elena Rossi

Technical Supervisor

The air-cooled pelletizer we used before always had problems - the pellets were of different sizes and always stuck together, and we had to pick out 10% of the waste every time we did quality inspection. After switching to your HWP4000 underwater pelletizer, all these problems are gone. The pellets cut out are now round and smooth, the thickness deviation when blowing the film from the customer is reduced by half, and the return rate has almost dropped to zero. The most surprising thing is that the water system is particularly worry-free, the automatic filtration does not require daily cleaning, and the servo motor saves electricity, which means that we can earn nearly 20,000 euros more per month.

Thomas Berger

Production Director

Twin screw extruderFrequently Asked Questions

Q: What is an underwater pelletizer?

A: The underwater pelletizer is a machine used to produce plastic pellets. The uniform plastic pellets produced are convenient for storage and transportation and can be used to make other products.

Q:working principle of an underwater pelletizer?

A: The molten plastic is extruded through a die into a chamber filled with circulating water for cooling and then cut into uniform plastic particles.

Q: Common faults and solutions of underwater pelletizers

Particle adhesion: Check whether the water temperature exceeds 60℃ (40-50℃ is recommended) or the water hardness is too high;
Die head blockage: rinse with a special cleaning agent before stopping the machine, and install a double-stage filter when processing recycled materials;
Abnormal tool noise: Check the tool shaft bearing clearance (should be ≤0.05mm) or replace the titanium carbide coated tool.

UET TECH: China's top underwater pelletizing machine supplier

We are a factory of extruders and underwater pelletizers from China. We can provide you with high-quality equipment. Please leave your contact information! Our experts will contact you within 12 hours to answer your questions one by one.