Six Measures For Screw Slip Treatment Of Twin-screw Granulator
for screw slip treatment of twin-screw granulator
Six measures
Incorrect material drying will significantly reduce the viscosity of the material in the barrel and produce water vapor, making it difficult for the twin screw to move the material forward.
Incorrect material drying will significantly reduce the viscosity of the material in the barrel and produce water vapor, making it difficult for the twin screw to move the material forward.
1, What if the back pressure is too high?
If the back pressure is set too high, the screw may not generate enough forward pressure to overcome the back pressure counterpressure, and the screw will rotate in one position without moving backward. This will do more work on the melt and significantly increase the melt temperature, which will have an adverse effect on product quality and cycle time.
2, What if the barrel or screw wear?
The same as the feed section, when the resin melts on the barrel wall while being compressed in the screw compression section, it adheres to the barrel wall. When the screw rotates, the material is subjected to shearing force and detaches from the barrel wall and is conveyed forward.
3, What if the latter half of the barrel is too hot or too cold?
In the rear part of the feed section, a layer of molten polymer film is formed during the heating and compression process of the material.
The molten film layer adheres to the barrel.
Without this thin layer, the granular material would be difficult to advance.
The material in the feed section must be heated to the critical temperature to produce the critical molten film layer.
However, it is often the case that the material in the barrel stays there for too short a time to allow the polymer to reach that temperature.
This may be caused by the small scale of the equipment, which corresponds to a smaller barrel and screw configuration.
A short residence time can lead to insufficient melting or mixing of the polymer, which can cause the twin-screw to slip or stop.
4, What if when processing of hygroscopic data how to do?
Incorrect material drying will significantly reduce the viscosity of the material in the barrel and produce water vapor, making it difficult for the twin screw to move the material forward.
5, What if the hopper planning is not correct?
In the rear part of the feed section, a layer of molten polymer film is formed during the heating and compression process of the material.
The molten film layer adheres to the barrel.
Without this thin layer, the granular material would be difficult to advance.
The material in the feed section must be heated to the critical temperature to produce the critical molten film layer.
However, it is often the case that the material in the barrel stays there for too short a time to allow the polymer to reach that temperature.
This may be caused by the small scale of the equipment, which corresponds to a smaller barrel and screw configuration.
A short residence time can lead to insufficient melting or mixing of the polymer, which can cause the twin-screw to slip or stop.
6, What if the check ring is faulty how to do?
When the screw is rotating and plasticizing the material, the backstop ring should be in the front position, in contact with the fixed ring seat. If the backstop ring is in a rearward position or between a forward and rearward position, there will be resistance when the molten polymer passes through the gap between the backstop ring and the ring seat. If you suspect that the backstop ring is not functioning properly, it should be replaced immediately.
