china underwater pelletizer system manufacturer — Granuwel

Underwater pelletizers are specialized equipment used for the granulation of polymers and thermoplastics, capable of producing uniformly shaped, high-quality pellets.
These underwater pelletizers utilize a unique underwater environment to cut molten plastic into pellets of the desired size through high-speed rotating blades. This process is completed in water, effectively preventing oxidation or rapid cooling of the molten plastic when it comes into contact with air, ensuring the quality of the final product.
The machine consists of major components such as a melt pump, filter, startup valve, die head, main body of the pelletizer, water circulation system, and dehydration system, enabling highly automated, efficient continuous production.

Underwater Pelletizer

underwater pelletizing system Features

Underwater pelletizers are characterized by their wide application range, high production capacity, precise particle size control, unique cooling method, and strong adaptability. Details are as follows:

Wide application range

Suitable for the compounding and granulation of most plastic polymer materials, especially for materials with lower hardness or higher viscosity, making it the best choice. This feature allows underwater pelletizers to be widely used in multiple industries, such as the manufacturing of high-performance materials like EVA, TPU, TPE, etc.

High production capacity

Thanks to the powerful circulating water cooling system and dehydration system, the output of underwater pelletizers can be maximized. The yield per unit time is much higher than that of other types of pelletizers, thereby meeting large-scale production needs.

Precise particle size control

The range of particle sizes produced is extensive, especially having a unique advantage in producing particles ≤1mm. This means that underwater pelletizers can produce a variety of different specifications of plastic particles, from microparticles to large particles, something other types of pelletizers struggle to achieve.

Unique cooling method

Underwater pelletizers use water as the cooling medium, which not only enables uniform and rapid cooling of the particles but also reduces contact between molten plastic and air, lowering the risk of oxidation and degradation, and ensuring product quality.

Strong adaptability

Particles made by underwater pelletizers have an aesthetically pleasing appearance, being oval or spherical, which improves particle flowability. This enhancement in appearance and flowability further increases the product's market competitiveness and applicability.

Application fields

The four special applications of the underwater pelletizing system
There are four special applications that can only be handled by the underwater pelletizing system.

Circular granules with a diameter of ≤1mm.

Circular granules can only be produced through the underwater pelletizing system.
These microparticles are often used in the preparation of high-concentration masterbatches. The particles are very small, achieving dispersion effects without or with minimal use of dispersing agents. This can save a significant amount of cost. Granular masterbatches are easier to handle, measure, and do not cause dust emissions.

High yield

Other types of pelletizing systems struggle to handle yields exceeding 1000kg/h. The underwater pelletizing system can handle up to 50 tons/hour.

Soft materials with a hardness less than Shore A40

Many types of soft materials, such as TPE/TPV/EVA/hot melt adhesives, can only be made through the underwater pelletizing system.

Polymer synthesis and reaction

The polymerization, reactive extrusion, and conversion of many materials from liquid to granular form can often be achieved through underwater cutting.

General Applications

Filled modification

Such as PE, PP, PS, EVA + calcium carbonate CaCO3, talcum powder Talc, titanium dioxide TiO2, carbon black, etc.

Color masterbatches

Such as PE, PP, PS, ABS, EVA, PET + pigments and additives.

Various thermoplastic elastomers

TPE, TPR, TPU, TPV and other thermoplastic elastomers.

EVA hot melt adhesives, etc.

Product specification

Model	Steering Gear	Hole number	Blade Number	Tool Movement	Output
UWP30	D30 type	8~10	4~6	Pneumatic feed	50~300kg/h
UWP50	D40 type	20~30	6~8	Pneumatic feed	200~700kg/h
UWP100	D50 type	40~80	8~12	Pneumatic feed	2tons/h
UWP200	D60 type	100~160	10~16	Pneumatic feed	2~6tons/h
UWP400	D60 type	100~160	12~18	Pneumatic feed	3~8tons/h

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