Chemically Treated PET Film
- Material:BOPET film with chemical coated surface
- Color:Clear, transparent, or slight haze option
- Treated side:One-side or two-side treated
- Thickness:12 um to 250 um typical range
- Width:Custom slit rolls available
- Use:Printing, coating, adhesive bonding, and lamination
Protective Film Factory is a manufacturer of chemically treated pet film for printing, coating, adhesive bonding, and lamination processes that need reliable adhesion on PET substrates. The film uses a controlled chemical coating or primer treated layer to improve ink adhesion, coating anchorage, adhesive wet-out, and laminate bonding. Before full-scale production, treated side direction, 52-58 dyne/cm surface energy, coating uniformity, and small ink or lamination trials should be checked together.
Product Overview
Chemically treated pet film is used when ordinary PET film is too inert for stable bonding with ink, adhesive, primer, coating, or laminated layers. The chemical coated side improves wet-out, so inks, lacquers, hard coatings, pressure-sensitive adhesives, and functional coatings can spread more evenly across the surface. This chemical coated PET film helps reduce adhesion changes after drying, curing, winding, storage, or later lamination.
The film can be produced as one-side chemically treated PET film, two-side treated PET film, or one chemical coated side with the reverse side corona treated or untreated. Printing needs the treated side facing the ink system, while lamination needs it facing the adhesive or coating layer. If the roll is used in the wrong direction, ink lifting, adhesive beading, coating shrinkage, fish-eyes, pinholes, or low peel strength may appear.
Benefits
- Improves ink anchorage for solvent-based, water-based, UV, and specialty printing systems.
- Supports smoother wet-out for acrylic, PU, solventless, and pressure-sensitive adhesives.
- Helps reduce pinholes, streaks, fish-eyes, untreated bands, coating shrinkage, and uneven laydown.
- Gives more consistent lamination bond strength after curing and 24-72h dwell.
- Supports metallizing, primer coating, hard coating, and functional coating processes.
- Reduces reverse-side processing risk through roll marks, side labels, dyne checks, and small coating trials.
How should the treated side be identified before printing, coating, or lamination?
The treated side should be confirmed before ink, adhesive, or coating is applied. Appearance alone is not enough because both sides may look nearly the same. Dyne pens, dyne solution, roll direction labels, treated-side marks, or a small ink and coating trial can be used. On the correct surface, test liquid should wet out evenly instead of shrinking into droplets. Stored rolls should be checked again after long storage, high humidity exposure, or temperature change.
TDS
Item | Typical Value |
Product type | Chemical coated PET film / primer coated PET film |
Base material | Biaxially oriented PET film |
Appearance | Clear to slight haze, clean surface |
Thickness range | 12 um to 250 um |
Thickness tolerance | +/-5% typical |
Treated side structure | One-side chemical treated, two-side treated, or chemical treated / corona treated |
Surface energy on treated side | 52-58 dyne/cm typical |
Side-to-side dyne variation | <=3 dyne/cm typical |
Ink adhesion test | No obvious lifting after tape test |
Coating adhesion | Cross-hatch 4B-5B typical after curing |
Adhesive wet-out | Even wetting, no heavy beading |
Lamination peel observation | Checked after 24-72h dwell |
Light transmission / Haze | >=88% / <=3.5% for clear grade |
Heat shrinkage | <=1.5% at 150 C / 30 min typical |
Coating uniformity | No visible streaks, coating marks, or untreated bands |
Roll width tolerance | +/-1 mm typical |
Storage condition | Below 35 C, dry, avoid sunlight and high humidity |
Pre-production test | Dyne check, ink tape test, coating wet-out test, lamination peel test |
Applications
- Printed PET labels, overlays, face films, nameplates, and industrial graphic layers that need stable ink anchorage.
- Adhesive coating for double-sided tapes, transfer films, protective layers, and laminated film structures.
- Functional coating, hard coating, and release coating using primer coated PET film as the working substrate.
- Flexible packaging printing and adhesive lamination where surface treated PET film improves wet-out stability.
- Electronic, display, insulation, and decorative film converting where coating bond must remain stable after curing.
- Metallizing or barrier film structures requiring stronger metal anchorage or primer bond.
What is the difference between corona treated PET film and chemically treated PET film?
Corona treatment raises surface energy by electrical discharge, so inks, coatings, and adhesives can wet the film more easily. Chemical treatment adds a controlled primer or coating layer, which is more suitable when stronger ink adhesion, coating anchorage, metallizing bond, or lamination strength is required. For primer coated PET film, unnecessary re-treatment should be tested carefully because it may affect the original coated layer. A higher dyne value does not always mean better final bonding, so approval should be based on printing, coating, curing, cross-hatch adhesion, and peel strength results.
Production Line
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FAQ
Is chemically treated pet film the same as corona treated PET film?
No. Corona improves wetting; chemical treatment adds a coated or primer surface for stronger bonding.
How can the treated side be checked?
Use side labels, dyne testing, or a small ink and coating trial.
Can it be used for adhesive lamination?
Yes. It suits matched acrylic, PU, solventless, and pressure-sensitive adhesive systems.
Should stored rolls be retested?
Yes. Recheck dyne value, ink adhesion, coating response, and lamination peel strength.
