Film Blowing Machine Troubleshooting
The growing demand for global processors to keep their blown film machine(also called film blowing machine) operations operating as efficiently as they can. Making multi-layer and single layer blown films that have excellent uniformity of the film, strong tensile strength and robust barrier properties, leaves no space for errors. To ensure product consistency as well as a low amount of waste and decreased downtime, we’ve compiled some of the most frequent blow-film issues and ways to resolve these issues.
Problem:Gels, un-melts, Charred polymer
Reason: Overheated/degraded polymer, poor melting, foreign substances in the resin stream
- Reduce the melting temperature or, if it does not melt then increase the extruder barrel temperature
- Make sure you have a thermocouple installed and that you are able to make sure that the heater is controlled correctly.
- Extruder screw damaged or worn out Inspect and take measurements of the screw’s dimensions
- Damaged or worn out extruder barrel Check and measure the barrel ID
- Examine the material handling and resins for foreign contamination such as angel hair, fluff and more.
Problem:Melt fracture “Sharkskin”
Cause: Melt temperature too low or die gap too narrow
- Raise melt temperature (if