FILM EXTRUSION
Corona Treatment for Blown Film, Cast Film, and Extrusion Coating
Film that leaves your line without adequate surface energy creates adhesion problems downstream for your customers and for your own converting operations. QC Electronics corona treaters deliver consistent, measurable dyne levels at the extrusion line so every roll ships ready to print, coat, or laminate.
Get a Quote → Talk to an EngineerTHE CHALLENGE
Why Extrusion Lines Need Corona Treatment
Freshly extruded polyethylene has a surface energy of just 31 dynes/cm. Polypropylene sits at 29. At these levels, inks bead, adhesives won’t anchor, and coatings pull back instead of wetting out.
Film extruders face two scenarios, and many run both. If you’re selling pretreated film to downstream converters, your product is only as valuable as what your customer can do with it. Film that won’t hold ink on a flexo press or bond in a laminating nip can trace back to inadequate treatment at the extrusion line, especially in materials like PP, that should always be pre-treated for converters.
If you’re extruding and converting in-house (printing, coating, or laminating your own film) corona treatment at the extrusion line is even more critical. Treating freshly extruded polymer produces higher, more consistent dyne levels than aged film. And for operations that go directly from extrusion into a print or laminating station, in-line treatment eliminates the dyne level decay that happens during storage and handling between processes.
THE SOLUTION
Treatment Matched to Your Extrusion Process
QC corona treaters are engineered specifically for the demands of extrusion environments—high temperatures, continuous 24/7 operation, and wide treat widths up to 5 meters. We size the system to your polymer type, line speed, and your own or your customers’ downstream requirements.
→Blown film extrusion: corona treatment is applied after the bubble is collapsed and before winding. Freshly extruded film accepts treatment more readily, producing higher and more durable dyne levels than re-treating aged film downstream
→Cast film extrusion: treatment is applied inline after the chill roll. Cast film lines run at higher speeds than blown film, demanding precise watt density control to maintain consistent treatment levels across varying line speeds
→Extrusion coating: corona treatment is applied to the substrate immediately before the molten polymer contacts the web. Treatment ensures the extrudate bonds permanently to the carrier substrate
Why Treatment at Point of Extrusion Matters
Freshly extruded polymer is at its most receptive to corona treatment: the chains are still mobile and accept surface modification more readily. Treatment at this stage requires less power to achieve higher dyne levels than re-treating aged film. In fact, certain films like polypropylene and polyester may never be receptive to corona treatment if they aren’t treated at the point of extrusion.
However, treatment is not permanent. Slip additives migrate to the surface, humidity accelerates decay, and dyne levels will diminish over time regardless of when treatment was applied. Industry experts note that freshly treated film consistently provides better adhesion than aged film at equivalent dyne levels, even when the numbers match on a dyne pen test.
For operations that convert in-house, in-line treatment immediately before the print or laminating station eliminates the decay variable entirely. For extruders selling pretreated film, treating at the extrusion line gives your customers the highest possible starting dyne level and the widest downstream processing window.
RECOMMENDED EQUIPMENT
Corona Treaters for Film Extrusion
Built for the demands of 24/7 extrusion environments: high temperatures, continuous duty, and treat widths up to 5 meters. Every system is configured to your specific polymer, line speed, and downstream application requirements.
BLOWN AND CAST FILM
TNT Covered Roll
Patented design purpose-built for blown and cast film lines. High-efficiency treatment on nonconductive substrates with minimal heat transfer to temperature-sensitive films. Treat widths up to 5 meters.
Blown FilmCast FilmPatented
EXTRUSION COATING W/ CONDUCTIVE CARRIER
Advantage Bare Roll
For extrusion coating lines running conductive substrates up to 132″ treat width. Designed for uniform treatment of aluminum and other metallized substrates at extrusion speeds.
Extrusion CoatingConductive
POWER SUPPLY
NEXTGEN-i Generator
Automatic watt density control with proportional ramp to line speed maintains consistent treatment regardless of speed changes. Touchscreen interface with recipe storage for quick job changeovers.
Auto Watt DensityTouchscreenRecipe Storage
RESULTS
What Corona Treatment Delivers for Film Extruders
Consistent Dyne Levels
Deliver film with predictable, measurable surface energy roll after roll. Eliminate customer complaints about treatment variation that leads to adhesion failures downstream.
Heat Management
QC’s patented TNT design minimizes heat transfer to temperature-sensitive films. Airflow and station geometry keep dielectric consumables cool for extended service life in continuous 24/7 operation.
Downstream Adhesion
Film treated at the extrusion line gives your customers the surface energy they need for printing, coating, and laminating, reducing rejects and returns caused by inadequate treatment.
Extended Treatment Life
Treating freshly extruded polymer produces higher initial dyne levels and slower treatment decay compared to re-treating aged film. Your customers get a wider processing window.
OUR PROCESS
From Your Application to a Working Solution
01
Application Review
We gather details about your substrate, ink type, line speed, treat width, and production environment.
02
Lab Testing
Ship us your substrate. We run it through our treaters and measure dyne levels to determine optimal treatment parameters.
03
System Design
Our engineers configure a corona treater matched to your exact specs: application, substrate, treat width, power density, and mechanical integration.
04
Install & Support
Every system ships after a week-long QA test under load. We support installation and provide ongoing technical assistance.
EXPLORE OTHER APPLICATIONS
GET STARTED
Ready to Deliver Better Film?
Tell us about your extrusion process, polymer type, and your customers’ downstream requirements. Our engineers will recommend the right corona treatment system and provide a detailed quote.
Request a Custom Quote →Or reach us directly