Specification errors are the single largest cause of rollstock rejection at the FFS line. Rather than selecting by GSM alone, experienced procurement teams evaluate paper film against four decision variables, in the following order of priority:
Step 1 — Define the Barrier Need
Start with the product itself. Dry, non-aromatic goods (sugar sticks, tea tags) tolerate uncoated paper. Aroma-sensitive goods (loose tea, coffee, herbs) require a coated structure with defined oxygen and moisture transmission rates. Request an OTR/WVTR data sheet before sampling.
Step 2 — Match the Machine Envelope
Confirm with your FFS equipment supplier the acceptable thickness range, sealing temperature window, and minimum web tension. A paper that runs perfectly on a Bosch SVE may tear on a higher-tension IMA C24. This step cannot be skipped — ask the rollstock supplier for a documented machine compatibility list.
Step 3 — Decide the Finish Direction
Matte, uncoated finishes communicate a natural, minimalist identity and suit organic or wellness brands. Gloss or spot-varnish finishes deliver stronger retail-shelf impact. This is a brand decision, not a technical one — align it with your marketing team early.
Step 4 — Verify End-of-Life Compliance
If the product will be sold in the EU, request recyclability evidence (Aticelca, PTS, or CEPI 4evergreen) or compostability certification (TÜV OK Compost). A coating that appears paper-like but exceeds 5% polymer content may disqualify the package from paper recycling streams.
Following these four steps in sequence — rather than in parallel — reduces sampling cycles and eliminates the most common reason for production delays.
The table below summarizes XLD’s recommended specifications from years of production.
| Selection Factor | Recommended Specification | Best Suited For |
|---|
| Barrier Requirement | Coated kraft paper with heat-seal layer | Tea, coffee, herbal, aroma-sensitive products |
| Machine Compatibility | 40–60 GSM, tension-stable rollstock | Vertical and horizontal FFS lines |
| Print Finish | Matte coating for natural look; glossy for vibrant graphics | Premium retail and private-label brands |
| Sustainability Focus | Recyclable or TÜV-certified compostable paper | Eco-conscious and EU-market brands |
| Sealing Method | Heat-seal coating (standard); cold-seal (high-speed) | Continuous high-output production |
| Width and GSM Tolerance | ±0.5 mm width, ±3% GSM | Precision FFS equipment |