Many friends complain that their twin-screw granulator has poor blending performance during operation, because they have not figured out the factors that affect its blending performance. These factors include feeding height, mixing type, grounding and anti-static of hopper chute, and compressed air rupture device, etc. And in the process of use, it is also necessary to pay attention to the correct operation methods of starting and stopping. In the article, the editor will introduce the factors that affect the blending performance of twin-screw granulators, as well as the correct methods of starting and stopping.
Factors affecting the blending performance of twin-screw granulators:
During the operation of the twin-screw granulator, there are many factors that affect its later blending effect. Let's take a look at the factors that affect the blending performance:
1. Drop height of twin-screw granulator
Ideally, the feeding screw should be installed as close as possible to the top of the side feeding port to reduce the height of the material dropping. If a fluffy material flows through the air, it may become filled with air, greatly reducing its false density after falling.
2. Mixing type of twin-screw granulator
Ensure that the agitator in the packing twin-screw granulator does not cause the packing to become fluidized. Many mixer manufacturers have designed special mixers for feeding fillers. The storage container will introduce air into the twin-screw granulator along with the packing material. A sloping hopper with an open top helps with exhaust. If your inclined feeding hopper has a solid lid and a round tube, and is flexibly connected to the feeder, then an exhaust port needs to be designed.
3. The chute of the hopper should be grounded to prevent static electricity
Some materials generate static electricity due to friction, causing the powder to hang on the hopper wall, resulting in the powder becoming flaky. A simple solution is to ground the hopper chute of the twin-screw granulator.
4. Compressed air blaster
If the cake persists, special methods are often required. A hopper vibrator can be used, but it takes up space and still needs to be installed. An alternative solution is to install a blaster with an air nozzle at the appropriate position on the chute and blow it through before the cake grows.
The correct way to start and stop the twin-screw granulator:
Many friends feel that they are already very familiar with the operation method of twin-screw granulators, but in fact, there are many friends who make mistakes in starting and stopping. Let's take a look at the correct operation:
1. Common operating methods
Operators are accustomed to turning on the twin-screw granulator when they arrive at the factory in the morning, but they are busy with other things. Heat the twin-screw granulator to full range idle for several hours. This will cause the polymer to adhere to the screw and barrel, and subsequently these polymer materials will continue to degrade and carbonize.
2. Correct startup method
Plan when you will actually operate the twin-screw granulator and start heating, just reach the predetermined temperature, and then proceed with barrel filling.
3. Correct shutdown method
Before shutting down, fill the twin-screw granulator with inert polymer to seal the gaps of the machine to the maximum extent possible. HDPE drives away oxygen and coats the metal surface, effectively reducing the formation of carbon oxides. After the twin-screw granulator is "sealed", it can be rapidly cooled by setting all temperatures to zero, opening all cooling water valves, and allowing cooling water to pass through all cylinder parts to quickly cool down. Rapid cooling can prevent polymer degradation and carbonization.
The above is what the editor has introduced to you about the factors that affect the blending performance of twin-screw granulators, as well as the correct methods for starting and stopping them