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 bein