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The underwater granulator is similar to the air granulator and the water granulator. The equipment mainly covers: plastic granulator, single and double screw plastic extruder, plastic film blowing machine, bag making machine, printing machine, coating Machine, tape machine, tape slitting machine, slitting machine, strapping machine. The modified formula is mainly made of alloy materials, especially PET, PC, ABS, (PP, PA), which are currently growing in the application areas; plastic formulas have developed plastic wrap, degradable film, PET thickening and toughening formula . The difference is that it has a smooth flow of water through the die face, in direct contact with the die face. The dicing chamber is sized to allow the dicing blade to freely rotate across the die face without limiting the water flow temperature. The molten polymer is extruded from the die, and the rotary cutter cuts the pellets, and the pellets are taken out of the pelletizing chamber by the tempered water and enter the centrifugal dryer. In the dryer, the water is drained back to the storage tank, cooled and recycled; the pellets are removed by a centrifugal dryer.
As a Crusher Granulator Manufacturer, we know that the strip production line is not costly, easy to operate, and easy to clean. This has advantages for color compounding because the replacement of two different batches of color must be thoroughly cleaned. However, the disadvantage of the strip forming method is that the cooling section takes up space and its length is determined by the temperature requirements of the polymer.
Most polymers must be compounded before they are made into a final product and then granulated to become a marketable ingredient. The power required by the granulator is proportional to the amount of extrusion and is exponentially related to the size of the screen. There are many different granulator designs, but all granulators can be divided into two broad categories: cold pelletizing systems and die face hot pelletizing systems. The main difference between the two is the arrangement of the pelletizing process time. The cold pelletizing system cuts the pellets from the solidified polymer at the end of the processing; in the die face hot pelletizing system, the pellets are pelletized when the molten state polymer emerges from the die, while the pellets are processed downstream. cool down. Both pelletizing systems have their own advantages and disadvantages.
Cold pelletizing system: The cold pelletizing system consists of a die, a cooling zone (air or water), a drying zone (if water is used) and a pelletizing chamber. There are two main types of cold pelletizing systems, namely pellet granulators 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. This granule system features a specially designed water jetting chamber. The water flows in a spiral around the flow until it flows out of the sugar chamber. After the pellets are cut, they are thrown into the water stream for preliminary quenching. The pellet slurry is discharged into the pellet slurry tank and further cooled, and then sent to a centrifugal dryer to remove moisture.
The history of the strip granulator is almost as long as the pellet granulator. Includes die, cooling section (water bath or blower), drying section (if water cooled) and pelletizing knife. Extrusion of the molten polymer by an extruder or gear pump forms a strip through a horizontally mounted die (a modern die is precision machined and uniformly heated to produce a stable quality strip). After the strips are discharged from the mouth, they are cooled by a blower or air/vacuum or cooled in a water bath. If water cooling is used, the strip is passed through a drying section, forced air is used to blow off the water, and the strip is sent to the pelletizing chamber. The strip is precisely cut to the desired length by the shearing action of a pair of fixed and rotating knives.
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