The underwater granulator is similar to the air granulator and the water jet granulator. The equipment mainly covers: Plastic Granulator, single and twin screw Plastic Extruder, plastic film blowing machine, bag making machine, printing machine, coating machine machine, tape machine, tape slitting machine, slitting machine, packing tape machine. In terms of modified formula, alloy materials are mainly used, especially PET, PC, ABS, (PP, PA) materials that are currently expanding in application areas; plastic formulations have developed formulas such as cling film, degradable film, PET thickening and toughening, etc. . The difference is that it has a smooth flow of water flowing over the die surface, which is 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 face without restricting the water flow temperature. The molten polymer is extruded from the die, and the pellets are cut by the rotary knife, and the pellets are carried out of the pelletizing chamber by the temperature-regulated water and enter the centrifugal dryer. In the dryer, the water is drained back to the storage tank, cooled and recycled; the pellets are passed through a centrifugal dryer to remove moisture.
The strip production line is inexpensive, easy to operate, and easy to clean. This has advantages for color compounding, since the change of two different color batches requires a thorough cleaning of the equipment. However, the disadvantage of the strand making method is that the cooling section takes up space, the length of which is determined by the temperature requirements of the polymer.
Most polymers must be compounded, compounded and then pelletized into a marketable feedstock before being made into the final product. The power required by the granulator is proportional to the extrusion volume and exponentially related to the size of the filter screen. There are many different pelletizer designs, but all pelletizers can be divided into two broad categories: cold pelletizing systems and die face hot pelletizing systems. The main difference between the two is the timing of the dicing process. Cold pelletizing systems are pelletized from the solidified polymer at the end of the process, while hot die-face pelletizing systems are pelletized as the molten polymer emerges from the die, and the pellets are pelletized downstream. cool down. Both pelletizing systems have their own advantages and disadvantages.
Cold Pelletizing System: A cold pelletizing system consists of a die, cooling zone (air or water cooling), drying zone (if water cooling is used) and a pelletizing chamber. There are two main categories of cold pelletizing systems, namely flake pelletizers and strip pelletizers.
The molten polymer is extruded from a hot die and cut into pellets by a rotary knife that rotates on the die face. The special feature of this sweet granulation system is its specially designed water jet granulation chamber. The water flows in a spiral line until it flows out of the almond chamber. After the pellets are cut, they are thrown into the water flow for preliminary quenching. The pellet water slurry is discharged into the pellet slurry tank to be further cooled, and then sent to a centrifugal dryer to remove moisture.
Strand granulators have been around for almost as long as tablet granulators. Includes die, cooling section (water bath or blower), drying section (if water-cooled) and pelletizer. The molten polymer is extruded with an extruder or gear pump through a horizontally mounted die to form strands (modern dies are precision machined and uniformly heated to produce strands of consistent quality). Once the strands are discharged from the die, they are cooled with a blower or air/vacuum facility, or with a water bath. If water cooling is used, the strands pass through a drying section where forced air is used to remove the moisture, and then the strands are sent to the pelletizing chamber. Using the shearing action of a pair of stationary and rotating knives, the strip is cut to the desired length precisely.
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