The analysis of PVC screw normal fracture and abnormal fracture

PVC screw normal?fracture

The screw is a consumable in the extrusion process, and the screw life varies with different product calcium powder addition. Generally, the screw life of 100 parts calcium and below is 1-2 years, the screw life of 100-200 parts calcium is about 1 year, the screw life of 200-300 parts calcium is 6-8 months, and the screw life of more than 300 parts calcium is 3 months. Of course, the choice of calcium powder is also very important, light calcium can obviously extend the screw life more than heavy calcium. Screw wear serious fracture is a normal phenomenon!

PVC screw abnormal fracture

1.?Distribution box bearing damage causes screw fracture.

Cause analysis: bearing aging or inherent quality hidden danger.

Solution: replace the bearing.

Elimination method: check the distribution box regularly, especially listen to the sound for any abnormality.

2.?The heating temperature is not enough to cause screw fracture.

Cause analysis: line problem or heating ring damage

Solution: check the line or replace the heating ring.

Elimination method: carefully check the temperature of each zone before starting up, and check the temperature of each zone regularly during production.

3.?Material interruption during production causes screw fracture.

Cause analysis: material bridging in hopper or feeding personnel did not add material in time

Solution: add stirring device to hopper.

Elimination method: check the material in the hopper of spring feeding or screw feeding regularly, and add an alarm device to the lower hopper.

4.?Formula problem causes screw fracture.

Cause analysis: mixing personnel mistake caused formula error.

Solution: Carefully mix according to the formula sheet.

Elimination method: check the main engine current irregularly, and carefully observe the machine running state when changing the formula.

5.?Foreign matter in raw material causes screw fracture.

Cause analysis: foreign matter in raw material causes screw jamming

Solution: put a strong magnet at the discharge port.

Elimination method: clean up the impurities on the surface of the strong magnet irregularly.

Summary: In summary, most of screw fractures are caused by these reasons. As long as these problems can be eliminated, I believe that your screw fracture probability will be reduced a lot.

If you have any further questions about the production of PVC products, please feel free to contact me at any time.