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Classification introduction of granulator

by:TENGDA     2022-12-24
The underwater granulator is similar to the airflow granulator and the water spray granulator. The equipment part mainly covers: plastic granulator, single and twin-screw plastic extruder, plastic blown film machine, bag making machine, printing machine, coating machine machine, tape machine, tape slitter, slitter, strapping machine. In terms of modified formulas, alloy materials are the main materials, especially PET, PC, ABS, (PP, PA), which are currently growing in application areas; plastic formulas have developed formulas such as cling film, degradable film, and PET thickening and toughening. . The difference is that it has a steady flow of water flowing through the die surface, and in direct contact with the die surface. The size of the cutting chamber is just enough to allow the cutting knife to rotate freely across the die face without restricting the temperature of the water flow. The molten polymer is extruded from the die, the rotary knife cuts the pellets, and the pellets are taken out of the pelletizing chamber by the temperature-adjusted 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 water.

The cost of the strip production line is not high, the operation is simple, and the cleaning is convenient. This has its advantages for colorant compounding, since the changeover of two different batches of colorant necessitates a thorough cleaning of the equipment. However, the disadvantage of the sliver method is that the cooling section takes up space and its length is determined by the temperature requirements of the polymer.

Before most polymers are made into final products, they must be compounded and then granulated to become salable raw materials. The power required by the granulator is directly 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 main categories: cold-cut pelletizing systems and die-face hot-cut pelletizing systems. The main difference between the two lies in the timing of the pelletizing process. Cold pelletizing systems cut pellets from the solidified polymer at the end of the process; while hot die-face pelletizing systems pelletize the polymer as it emerges from the die in a molten state and the pellets are processed downstream cool down. Both pelletizing systems have their advantages and disadvantages.

Cold pelletizing system: The cold pelletizing system includes a die, a cooling zone (air-cooled or water-cooled), a drying zone (if water-cooled) and a pelletizing chamber. There are two types of cold pelletizing systems, namely flake pelletizers and strip pelletizers.

The molten polymer is extruded from the hot die and cut into pellets by a rotary knife rotating on the die surface. The special feature of this sugar granulation system is its specially designed water spray granulation chamber. The water flows around the cause in a spiral until it flows out of the grain 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 the centrifugal dryer to remove moisture.

The use history of the strip granulator is almost as long as that of the tablet granulator. Includes die, cooling section (water bath or blower), drying section (if water cooled) and pelletizing knife. Rods are formed by extruding the molten polymer through a horizontally mounted die using an extruder or gear pump (modern dies are precision machined and heated uniformly to produce a consistent quality rod). After the strip is discharged from the die, it is cooled by blower or air/vacuum equipment, or cooled by water bath. If water cooling is used, the strands need to pass through a drying section, the moisture is blown off with forced ventilation, and then the strands are sent to the cutting chamber. Using the shearing action of a pair of stationary knives and rotating knives, the strips are precisely cut to the desired length.

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It is one of the best products available in the market today. Application is famous product in many oversees market.
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