Film Tube Deviation in a Blown Film Machine

1.Body and Die Temperature Too High

Cause:

Excessively high temperature can lead to overly fluid plastic melt, resulting in unstable film and causing tube deviation.

Solution: Appropriately lower the temperature of the body and the die.

2.Die Connector Temperature Too High

Cause:

High temperature of the die connector affects the flow and stability of the melt, leading to tube deviation.

Solution: Appropriately lower the temperature of the die connector.

3.Uneven Extrusion from the Die, Leading to Uneven Film Thickness

Cause:

Uneven extrusion results in film with varying thickness, which can cause tube deviation.

Solution: Adjust the die gap to ensure uniform extrusion and adjust the die connector temperature to stabilize the melt flow.

4.Uneven Cooling by the Air Ring

Cause:

If the cooling effect of the air ring is uneven, the film cools at different rates, causing tube deviation.

Solution: Check the air ring to ensure even distribution of cooling air, and appropriately adjust the position and airflow of the air ring.

5.Unstable Traction Speed

Cause:

Unstable traction speed or an imbalanced traction device can cause tube deviation.

Solution: Check and adjust the traction device to ensure stable and balanced operation.

6.Raw Material Issues

Cause:

Quality issues with raw materials, such as excessive impurities or inconsistent melting points, can also cause tube deviation.

Solution: Select higher quality raw materials and avoid using plastic with excessive impurities.

7.Improper Die Position

Cause:

An improperly positioned or loosely installed die can cause uneven extrusion, leading to tube deviation.

Solution: Check and adjust the die position to ensure it is securely installed and correctly positioned.