How does a plastic pelletizer work?

Plastic pelletizing is the process of converting plastic back scrap into a usable clean raw material. In operation, the polymer melt is divided into a ring of strands that flow through an annular die into a cutting chamber flooded with process water. A rotating cutting head in the water stream cuts the polymer strands into pellets, which are immediately conveyed out of the cutting chamber.

 

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Plastic pelletizer machine are available in single (only one extrusion machine) and double stage arrangement (one main extrusion machine and one smaller secondary extrusion machine). It is recommended that to use double stage arraignment for recycling process due to the contamination in the plastic materials. There are also various options of plastic granule pelletizing technologies available to such as hydraulic assisted screen changer and double-piston screen changer to make sure there is no interruption during screen change. Our reliable gear box drives screw quietly to mix and move the molten plastic in the barrel. The screw that made of specially treated steel ensures against corrosion and abrasion. PID temperature control system with air or water cooling system maintains steady working temperature. "Hot Cut" water-ring die face pelletizing and "Cold Cut" strand pelletizing methods are available depending on your preference.

• Melt pelletizing (hot cut): Melt coming from a die that is almost immediately cut into pellets that are conveyed and cooled by liquid or gas;

• Strand pelletizing (cold cut): Melt coming from a die head is converted into strands that are cut into pellets after cooling and solidification.

Variations of these basic processes may be tailored to the specific input material and product properties in sophisticated compound production. In both cases, intermediate process steps and different degrees of automation can be incorporated at any stage of the process.

In strand pelletizing, polymer strands exit the die head and are transported through a water bath and cooled. After the strands leave the water bath, the residual water is wiped from the surface by means of a suction air knife. The dried and solidified strands are transported to the pelletizer, being pulled into the cutting chamber by the feed section at a constant line speed. In the pelletizer, strands are cut between a rotor and a bed knife into roughly cylindrical pellets. These can be subjected to post-treatment like classifying, additional cooling, and drying, plus conveying.

Our company has rich experience in the plastic machinery making industry. Our main products include plastic extrusion machine,plastic recycling machine, plastic pelletizing machine and so on. Our products are with CE and SGS certification. Welcome your inquiry!


Post time: Jul-01-2022