In the process of compounding , in order to reduce costs, many film, sheet, profile and pipe manufacturers are adding more and more mineral fillers to their material formulations. For compounding processors, increasing filler content is a new challenge. If the screw and the machine are damaged and corroded by the filling products, it will directly affect the normal operation of the equipment, production efficiency and product quality. For such problems, if you only try to increase the grade of the filler in the single-screw extruder, it is not better to disperse the filler. The twin-screw extruder provided by Nanjing HiSi can make the percentage of calcium carbonate Up to 85%, therefore, a large proportion of fillers are added to the product, which can save a big amount of resin per year and fully recover the cost of the extruder equipment.

Related extruders for various polymer compound

This TSE-75B twin screw extruder is Haisi's 2018 lateset design. From the gearbox, screw elements to the assembling of the extruder is all done by ourselves.

A line for the production of polymer compounds is a specialized system designed to blend, melt, and process various polymer materials with additives to create custom compounds. The line typically includes extruders, mixers, and pelletizers, ensuring precise control over the material's composition, properties, and consistency. This system is commonly used in industries such as plastics, automotive, and electronics, where specific material formulations are needed for various applications, including coatings, cables, and seals.

Twin screw extruder is widely used for plastic modification, plastic compounding, masterbatch making, as well as hard plastic recycling, such as PET bottles, TPU wastes, ABS shield, etc.

Here is a site photo of machine test running for PET bottle recycling. The pelletizing method is water strand pelletizing.

This four pelletizing methods are the most popular way in plastic granulation.

Also, we supply two stage extruder, single screw extruder, plastic mixer, plastic crusher and other auxiliary machines in plastic extrusion line.

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How to Choose the Right Plastic Pelletizing Machine: An Expert FAQ Guide

Q1: What exactly does a plastic pelletizing machine do?

A: A plastic pelletizing machine is industrial equipment designed to convert raw or recycled plastic materials into small, uniform pellets. By using precise heat and mechanical shear, the machine melts and shapes the plastic into granules that are easy to store, transport, and use in downstream manufacturing applications like injection molding or profile extrusion.

Q2: What is the first step in choosing the right pelletizing machine?

A: The most critical step is understanding your material. Different plastics have widely varying melt viscosities, thermal sensitivities, and flow characteristics. The extruder, screw design, and cutting method must be fully compatible with your specific polymer's properties to ensure stable production.

Q3: What is "Strand Pelletizing," and when should I choose it?

A: Strand pelletizing is a highly common technique where continuous strings (strands) of molten plastic are extruded, cooled in a water bath, and then chopped into uniform pellets by a rotating cutter.

• Best for: Companies with budget constraints processing a wide range of standard thermoplastics (like compounding or injection molding setups).

• Key Advantages: It has lower initial equipment costs, handles many standard materials easily, and uses very little water, making it environmentally friendly.

Q4: What is "Underwater Pelletizing," and what are its main benefits?

A: In an underwater pelletizing system, the molten plastic is cut directly at the die face while completely submerged in a continuous flow of water. This rapidly cools the plastic into highly uniform, spherical pellets.

Best for: Industries requiring premium pellet quality, such as high-end packaging.

Key Advantages: It produces excellent, consistent pellet shapes, dramatically reduces dust and workplace emissions, and is versatile enough to handle heat-sensitive materials.

Q5: What is "Water Ring Pelletizing," and who is it best for?

A: Water ring pelletizing is similar to the underwater method, but the plastic is cut at the die face in the air just before being thrown outwards into a circulating ring of cooling water.

• Best for: Plastic recycling plants and film factories (such as packaging film) that require precision but process highly sensitive formulations.

• Key Advantages: It is exceptionally ideal for heat-sensitive plastics, offers versatile processing for various formulations, and maintains high pellet quality and consistency.

Q6: Between the three methods, which is the most environmentally friendly?

A: While all modern machines are designed for efficiency, strand pelletizing is generally considered the most eco-friendly due to its minimal water usage compared to closed-loop liquid cooling systems.

Q7: Can I customize the size and shape of the pellets?

A: Yes. Most advanced pelletizing systems offer customization. By adjusting the die plate hole size, the rotational speed of the cutting blades, and the extruder throughput, you can tailor the final pellet dimensions to meet your exact downstream manufacturing requirements.

Q8: Are there special safety precautions required when operating these systems?

A: Because pelletizing involves high temperatures, immense pressure, and fast-moving cutting blades, strict adherence to safety guidelines is mandatory. Operators must be thoroughly trained on the specific machine's safety protocols, emergency stops, and proper maintenance procedures to ensure safe and continuous operation.

NANJING HAISI is professional manufacturer of plastic granulation unit, we supply Twin Screw Extruder, Single Screw Extruder, Plastic Recycling Extruder, Two Stage Extruder, Lab Scale Extruder, Mixing and Feeding Machine, Cooling and Pelletizing Machine, Crushing Machine and so on.