Blown Film Extrusion Die and Head Cleaning
Blown film dies and heads run for extended periods at high temperature, and over time that produces resin degradation, gel formation, and carbon buildup on the internal flow surfaces.
Left in place, these deposits show up as gels, streaks, and thickness variation in the finished film, and eventually restrict flow enough to affect bubble stability and output.
Cleaning the die and head correctly, without damaging the precision surfaces that control flow, is essential to getting the equipment back into production at full quality.
Why Blown Film Dies and Heads Need Specialized Cleaning
The internal geometry of a blown film die, spiral mandrels, flow channels, and die lips, is machined to extremely tight tolerances to achieve uniform film thickness and bubble stability.
Abrasive or overly aggressive cleaning methods can alter these surfaces permanently, degrading film quality even after the visible contamination is gone.
Effective cleaning has to remove degraded resin, carbon, and gel deposits while preserving the exact geometry the die was built to hold.
Our Cleaning Process
Thermal pyrolysis cleaning For heavy carbon buildup and degraded resin, we use a pyrolytic oven to remove plastic and polymer residue from dies, heads, and mandrels without altering the base metal’s structure or dimensional characteristics. This process is customized by material, coating, and contamination type to protect sensitive surfaces.
Chemical and mechanical cleaning For flow surfaces, die lips, and other precision areas, we use non-abrasive chemical agents and dedicated equipment to remove resin, gel, and contamination while preserving surface finish and critical tolerances.
Disassembly and reassembly Complex dies and heads are disassembled as needed for full access to internal channels and mandrels, cleaned, and reassembled to specification.
What We Clean
- Blown film heads and dies
- Spiral mandrels and flow channels
- Die lips and land surfaces
- Extrusion screws and cylinders
- Screen plates and filter components
Signs Your Die or Head Needs Cleaning
- Gels or black specks appearing in the finished film
- Thickness variation or bubble instability
- Increased pressure or reduced output at the same settings
- Visible carbon or resin buildup at the die exit
- Longer than usual purge times between runs or color changes
Why Choose PCT Europe
Since 2008, we have cleaned mechanical parts and equipment across the plastics industry, including dies, heads, screws, and cylinders from the extrusion sector.
Our thermal cleaning service meets strict quality and environmental standards, and every treatment is tailored to the specific metal, coating, finish, and contamination involved, so parts are returned to production without compromising the precision they were built for.
Contact us for an inspection and quote on cleaning your blown film extrusion die or head.
Frequently Asked Questions
Will cleaning affect the precision of my die or head?
No. Our cleaning methods are non-abrasive and tailored to the specific geometry, material, and coating of each part, so critical flow surfaces and tolerances are preserved rather than altered.
Can you clean dies with complex internal geometry, like spiral mandrels?
Yes. We disassemble complex dies and heads as needed to reach internal channels and mandrels, clean them thoroughly, and reassemble to specification.
Do you clean the whole extrusion line, or just the die and head?
We clean the full range of blown film extrusion components, including dies, heads, screws, cylinders, screen plates, and filter components, so a single visit can address the whole line if needed.
How often should a blown film die or head be cleaned?
This depends on the resin, additives, and run length, but signs like gels in the film, thickness variation, or rising pressure at the same settings are reliable indicators that cleaning is due.