ZhangJiaGang Antron Machinery,Co.,Ltd

Energy-saving renovation and purchase guide for granulator

Energy-saving renovation and purchase guide for granulator

Screw granulator is a molding machine that can make materials into specific shapes.
The underwater granulator is similar to the air granulator and the water jet 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 and packing belt 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, degradation 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.
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.
Energy Saving
The energy saving of the granulator can be divided into two parts: one is the power part and the other is the heating part.
Power saving: Most of the inverters are used. The energy saving method is to save the residual energy of the motor. For example, the actual power of the motor is 50Hz, and you only need 30Hz in production to produce enough. The excess energy consumption is vain. Wasted, the inverter is to change the power output of the motor to achieve energy saving.
Energy saving in heating part: Most of the energy saving in heating is energy saving by electromagnetic heater, and the energy saving rate is about 30%-70% of the old resistor ring.
1. Compared with resistance heating, the electromagnetic heater has an additional layer of insulation, and the heat utilization rate is increased. 

2. Compared with resistance heating, the electromagnetic heater directly acts on the material tube to reduce the heat transfer heat loss. 

3. Compared to resistance heating, the heating rate of the electromagnetic heater is faster than one quarter, which reduces the heating time. 

4. Compared with resistance heating, the heating speed of the electromagnetic heater is fast, the production efficiency is improved, the motor is in a saturated state, which reduces the power loss caused by high power and low demand. The above four points are the reasons why the energy can be as high as 30%-70% on the granulator.
Purchase guide
1. Use the mother machine and double screw feed.
2, the gearbox is better, the gear inside must be heat treated, the bearing can be adjusted.
3. The gearbox, screw, barrel, head and wear parts should be treated with strength, and the service life is guaranteed for more than 1 year.
4, the main components should use standard materials.
5, reducer and motor purchase professional manufacturers to produce suits, do not buy granulator manufacturers themselves assembled.
6, there must be a distribution work cabinet.
7, the most critical of the equipment is the quality of the screw and barrel is better.
8. The washing machine must be continuously produced. It is not necessary to stop the water change, and the washing pool is used, otherwise the efficiency is extremely low.
9, heating should be segmented, segment heating should be even and controllable.
10. There must be a matching waste plastic washing machine, using circulating water, without discharging sewage.
11, efficient energy saving.
12, the machine's aspect ratio can not exceed 20 (in the range of 16:1-20:1, that is to say the screw length is 16-20 times the diameter of the screw).
13, the model must not be less than 100, the greater the output.
14, there must be double exhaust.
15. The heating power of the granulator flange (die) is very important. It should be designed according to 2.5W per square centimeter (cross-sectional area).

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