Today, the use of PFA waste plastics is very important, and environmental advocates require PFA manufacturers to reuse all products. Therefore, the manufacturer has no choice but to reprocess the waste PFA plastic and scrap through the granulator. This process can reduce product costs and improve PFA utilization. Many municipalities also use pelletizers and shredders to sell PFA scrapsPFA Granulesmanufacturers to cover the cost of landfill disposal.

PFA Granules Airflow Granulator

It is recommended for polymers sensitive to heat and long residence times, such as polyvinyl chloride, TPR and cross-linked polyethylene. Cutting rates up to 4989.52 kg/h The flow path of the polymer from the extruder to the cutting chamber is kept as short as possible and the minimum amount of heat is used. As the polymer is extruded through the die, the force of rotation of the die face cuts it into PFA particles. After being cut, the PFA particles are immediately thrown off the rotating knife and captured by the forced circulation of air in a specially designed pelletizing chamber. The air stream initially quenches the surface of the PFA particles and carries them out of the pelletizing chamber to the cooling zone. Fluidized bed dryers are often employed to cool the PFA granules. The PFA particles slide down an adjustable slope, and the circulation fan blows air through the PFA particles. The residence time of the PFA granules in the dryer can be lengthened or shortened by adjusting the inclination angle of the bevel. Another common cooling method is to discharge the PFA granules from the pelletizing chamber into a water bath and then remove the water with a fluid bed dryer or centrifugal dryer.

PFA granule water spray granulator

Suitable for most polymers except polymers with low melt viscosity or with tackiness. This type of equipment is also called water ring pelletizer, and the pelletizing rate reaches 13607.77 kg/h.

The molten polymer was extruded from a hot die and cut into PFA pellets by a rotating knife rotating against the die surface. The special feature of this granulation system is its specially designed water jet pelletizing chamber. The water flows in a spiral until it flows out of the grain chamber. After the PFA particles are cut, they are thrown into the water flow for preliminary quenching. The PFA particle slurry is discharged into a PFA particle slurry tank to be further cooled, and then sent to a centrifugal dryer to remove moisture.

PFA Granule Underwater Granulator

Similar to the air flow granulator and water jet granulator, the difference is that it has a smooth water flow through the mold surface, and direct contact with the mold surface. The size of the pelletizing chamber is just enough to allow the pelletizing knife to rotate freely across the die surface without restricting the flow of water. The molten polymer was extruded from the die, the rotary knife cut the PFA granules, and the PFA granules were carried out of the pelletizing chamber by tempered water into a centrifugal dryer. In the dryer, the water is drained back into the holding tank, cooled and recycled; the PFA granules are passed through a centrifugal dryer to remove the water.

Underwater pelletizers need to use a die with uniform heat distribution and special insulation facilities. Small pelletizing knives are electrically heated; large pelletizing knives require an oil-heated or steam-heated die. The process water is normally heated to the maximum temperature, but not hot enough to adversely affect the free flow of the PFA granules. Underwater pelletizers are used for most polymers, and some models can reach a pelletizing capacity of 22679.62kglh. The manner in which water flows through the die face is a major advantage when used for pelletizing low viscosity or adherent polymers, but this feature may cause the die to freeze for some polymers such as nylon and certain brands of polyester. Other advantages are: because in the molten state of cutting pellets, and water plays a sound barrier role, noise emission is low; Compared with the cold cutting system, the number of times to replace the cutting knife is less.

PFA Granules Centrifugal Force Granulator

Centrifugal force granulator because the die only use or only need a minimum degree of heat, rather than hot die face pelletizer, and because of the molten polymer pelleting, also not cold cutting system, but a class. This type of granulator is characterized by the use of cylindrical die, extrusion holes distributed along its circumference. The molten polymer was fed at atmospheric pressure. The extrusion pressure is formed by the depth of the melt on the rotor, the rotor speed, and the relative density of the polymer. As the cylindrical die rotates with its mandrel at high speed, the action of centrifugal force causes the molten polymer to flow uniformly to the various orifices on the die. When the polymer flows out of the extrusion hole, the rotating die will flow out of the strip of material to the cutting knife. The pelletizing knife can be used in a fixed, often "band saw" form so that it rotates very slowly on the two turntables. Such a slow rotation helps to make the wear of the pelletizing knife even and keep the temperature low. After the PFA particles are cut, the PFA particles are thrown into a bin along a straight trajectory due to their own momentum, sprayed with water for cooling, and then dried using a method similar to that used in other hot die face pelletizers.

PFA granule crushing granulator can reprocess thermoplastic PFA scrap and granulate the material into a suitable size. Many thermoset PFA and synthetic material manufacturers also use pelletizers for scrap handling and reprocessing.

This article comes from:www.tflpfa.com

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