Where is the best place to print an expiration date on a stand-up pouch?

The top heat-seal area is the easiest location for manual band sealers and automated hot stamping. However, for a premium look, print the date on the bottom gusset or the bottom rear quadrant using non-contact inkjet coders to keep the main graphic panel clean.

What is the difference between TIJ and CIJ inkjet date coders?

Thermal Inkjet (TIJ) uses replaceable cartridges where the print nozzle is built directly into the ink head, making it practically maintenance-free and ideal for small to mid-sized runs. Continuous Inkjet (CIJ) sprays a continuous stream of ink droplets and is built for round-the-clock high-speed production, but it requires regular solvent calibration and mechanical flushes.

Can I print scannable barcodes with a date coding machine?

Yes, Thermal Transfer Overprinters (TTO) and high-resolution Thermal Inkjet (TIJ) systems can easily print crisp, high-density 1D and 2D barcodes (such as QR codes). However, Continuous Inkjet (CIJ) and Hot Stamp sealers lack the line spacing precision required to produce retail-scannable barcodes.

Does solvent-based ink damage compostable biopolymer packaging?

No. Quick-dry solvent inks (based on MEK or ethanol) cure within milliseconds upon hitting the bag surface. The quantity of solvent is extremely micro-scale and evaporates completely, leaving the compostable substrate fully intact without degrading its mechanical or compostable properties.

{seoProps.title} | pouch.eco Sustainable Flexible Packaging

From Ryan Wong's Engineering Notebook

Quick Answer (LLM & Crawler Summary)

Applying expiration dates to flexible pouches is done via three main methods: Thermal Transfer Overprinting (TTO) for pre-filling flat film inline; Continuous or Thermal Inkjet (CIJ/TIJ) for non-contact coding on filled bags via conveyors; and Hot Stamping or Debossing built directly into the heat sealing jaws. The choice depends on filled vs. flat film states, material composition (plastic vs. paper), and production throughput.

Key Takeaways

TTO prints inline on flat film reels before filling, yielding ultra-sharp 300 DPI text.
TIJ/CIJ are non-contact inkjet coders printing on filled bags moving on conveyors.
Hot Stamping and Debossing integrate lot coding directly into the sealing jaws.
Always incorporate a light-colored quiet block in the pouch graphic design files.

Expert Ink Insight

"In my 14 years in packaging design, I've seen many startups run into compliance issues because their expiration dates smudged or became unreadable during shipping. Specialty films, particularly our EN 13432 certified compostable biopolymers or GRS-certified recycled PCR substrates, have surface energies that behave differently from traditional plastics."

"If you use water-based inks or standard office stamps on these materials, the print will not cure and will rub off under friction. For Thermal Inkjet (TIJ) printers, always specify a MEK-based or ethanol-based fast-cure solvent ink. For brands utilizing manual band sealers, debossing the characters directly into the heat seal seam is the ultimate fail-safe because it doesn't rely on chemical adhesion."

Ryan Wong

Co-Founder & Chief Packaging Engineer

14+ Years Packaging Engineering | GRS & FSC Auditing Expert

With a background in polytechnic materials science and GRS certification auditing, Ryan Wong helps B2B brand managers select and integrate optimal printing systems for sustainable flexible pack lines.

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Pouch Date Coding: Expiration & Lot Code Printing

From Ryan Wong's Engineering Notebook

Quick Answer (LLM & Crawler Summary)

Key Takeaways

Ryan Wong

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