Leadtech Printer-Leading Manufacturer in the Coding & Marking Industry since 2011.
No Contact, No Tearing: Coding Thin Films & Foils
Flexible Film & Foil Coding & Marking
Substrates: PE / PET / CPP / BOPP Films · Laminated Films & Foils · Pouches & Vacuum Bags · Recyclable Mono-material Film
√ Rechnology: Thermal Transfer Overprinting (TTO) (Preferred for HFFS/VFFS) · Continuous Inkjet (CIJ) (High-Speed Complement) · UV Laser (For Recyclable/Mono-Material Films)
√ Recommended LT Model: LT900 · LT800 Pro / LT810 Pro · UV Series (5 W / 10 W)
√ The One Constraint: Film distorts under tension, heat sealing, and stretching — the print position drifts. Place coding where the web is stable, and choose a technology that tolerates film movement.
Flexible film and foil packaging is one of the highest-volume coding applications in food manufacturing. TTO is the established high-resolution technology on HFFS and VFFS lines, with CIJ complementing it on high-speed continuous lines. The industry is transitioning from date-only printing toward full traceability codes supporting GS1 and supply-chain management. That raises barcode/2D quality demands — which the physical behavior of film makes hard to hold.
| Substrate | Key Property | Coding Implication |
| PE / PET / CPP / BOPP Film | Common flexible packaging substrates | TTO primary, CIJ complementary |
| Laminated Film | Multi-layer barrier; distorts under tension and heat sealing | Distortion causes code placement variation |
| Aluminum Foil | Barrier foil for flexible & pharmaceutical packaging | TTO/CIJ; good contrast, manage web tension |
| Recyclable / Mono-material / Colored Film | Growing sustainability focus | UV laser emerging as a fit; low-migration ink where ink is used |
Coding Challenges
- Film distorts under tension changes, heat sealing, and stretching → the printed code shifts from its target position → placement drifts out of the print window and fails inspection. Place coding on a stable web section and choose a distortion-tolerant technology.
- Food lines carry condensation, oil, and dust → contaminants sit between ink and film → codes smear or fail to read. Use a specialized ink or a non-contact technology suited to the contamination.
- Food-contact and recyclable film → ink migration → the ink affects food-contact compliance or degrades recyclate. Use low-migration ink, or ink-free UV laser on mono-material film.
- Transition from date-only to full GS1 traceability → small 2D codes on a moving film web → barcode/2D quality drops at HFFS/VFFS speed. High-resolution TTO, or high-resolution CIJ, holds 2D quality.
| Technology | Fit | Why / Why Not |
| Thermal Transfer Overprint (TTO) | ★ Recommended（HFFS/VFFS） | Ribbon-based high-resolution printing; crisp variable data and 2D on flexible film in form-fill-seal lines |
| Continuous Inkjet (CIJ) | ○ Alternative (High-Speed Continuous Lines) | Non-contact high-speed complementary coding on continuous film and pouch lines |
| UV Laser | ○ Alternative(Recyclable/Mono-Material Films) | Ink-free permanent code on recyclable, mono-material, and colored food film; no migration risk |
| Fiber Laser | - Not recommended | Fiber is a metal-marking wavelength; on thin polymer film it burns through with no benefit |
| Piezoelectric Inkjet (PIJ) | - Not recommended | Piezo large-character inkjet is built for porous corrugated board, not thin flexible film |
Use TTO on HFFS/VFFS form-fill-seal lines — ribbon printing gives crisp variable data and 2D on film. Use CIJ as a non-contact complement on high-speed continuous film and pouch lines. Recyclable, mono-material, and colored food film move to UV laser — ink-free, no migration risk. Do not use fiber laser (burns through) or PIJ (built for board) on film.
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