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Pellets making machines are common production equipment in the plastics industry and play a very important role in the production activities of a factory. In this article, we will talk about what types of pellets making machines are available and what are the characteristics of these different types of pellets making machines.
Here is the list of contents
What is an underwater pellets making machine?
What is a strip pellets making machine?
The underwater pellets making machine equipment section mainly covers plastic pellets making machine, single and twin screw plastic extruder, plastic film blowing machine, bag making machine, printing machine, coating machine, tape machine, tape slitting machine, slitting machine, packing tape machine. Modified formulations are based on alloy materials, especially PET, PC, ABS, PP, PA, which are currently growing in application areas; plastic formulations are developed for cling film, degradable film, PET viscosity increase, and toughening, etc. Unlike air flow pellets making machine and water jet pellets making machine, it has a smooth stream of water flowing over the die surface, while in direct contact with the die surface. The pelletizing chamber is sized just enough to allow the pelletizing knife to rotate freely across the die surface without limiting the water flow temperature. The molten polymer is extruded from the die, the rotating knife cuts the pellets, and the pellets are carried out of the pelletizing chamber into the centrifugal dryer by the tempered water. In the dryer, the water is discharged back into the storage tank, cooled, and recycled; the pellets pass through the centrifugal dryer to remove the water.
Strip granulation lines are inexpensive, easy to operate, and easy to clean. This has its advantages for color mixing since the equipment must be thoroughly cleaned for the change of two different color batches. However, the disadvantage of the strip method is the space required for the cooling section, the length of which is determined by the temperature requirements of the polymer.
Most polymers must be combined with blending and then pelletizing before being made into a marketable raw material for the final product. The power required by the pellets making machine is proportional to the extrusion volume and exponential to the screen size. There are many different pellets making machine designs, but all pellets making machines can be divided into two main categories: cold cut pelletizing systems and die face hot cut pelletizing systems. The main difference between the two is the timing of the pelletizing process. In cold pelletizing systems, the pellets are cut from the cured polymer at the end of the process, while in die-surface thermal pelletizing systems, the pellets are cut as soon as the molten polymer emerges from the mouth die, and the pellets are cooled downstream.
Cold pelletizing systems include the die, the cooling zone (air or water-cooled), the drying zone (if water-cooled), and the pelletizing chamber. There are two main types of cold cut pelletizing systems, namely, flake pellets making machines and strip pellets making machines. The molten polymer is extruded from a hot die and cut into pellets by a rotating knife that rotates against the die surface. This type of pelletizing system is characterized by a specially designed water jet pelletizing chamber. The water flows in a spiral around the chamber until it flows out of the pellet chamber. After the pellets are cut, they are thrown into the water stream for initial quenching and cooling. The pellet water slurry is discharged into the pellet slurry tank to be further cooled and then sent to the centrifugal dryer to remove the water.
The strip pellets making machine has been in use for almost as long as the flake pellets making machine. It includes a mouth die, a cooling section (water bath or blower), a drying section (if water cooling is used), and a pelletizing knife. The molten polymer is extruded with an extruder or gear pump through a horizontally mounted mouthpiece to form the bars (modern mouthpieces are precision machined and uniformly heated to produce consistent quality bars). Once the strips are discharged from the mouthpiece, they are cooled by a blower or air/vacuum facility, or by a water bath. If water cooling is used, the strips are passed through a drying section with forced ventilation to remove moisture, and then the strips are fed to the pelletizing chamber. The strips are cut to the exact length required using a pair of fixed and rotary knives for shearing.
Zhangjiagang Chenxing Machinery Co., Ltd., its predecessor is Sanxing Plastic Machinery Factory. It evolved into a joint-equity enterprise in 1996 from the former collective enterprise. Founded in 2002, Chenxing Company is specialized in producing plastic machinery equipment. If you are interested in our products, please contact us for more information, we are looking forward to your visit.
