FABLE ·
Map the layer count across the mouth
A side gusset, bottom fold or overlapping web can change the stack at one point of the seam. Mark the thin middle, thick fold and step between them on a sample. Record the actual layer structure in each zone rather than multiplying a single thickness and assuming the materials behave identically.
Shortlist by the seam and operator access
Try handheld jaws such as FDR on a shorter, flat accessible opening; compare HI for a long straight supported seam in compatible materials. For a large pack, check whether ROS-25 can follow the fold transition without losing contact. None of these geometry choices establishes that a specified layer stack can be sealed.
Look for a process window across all zones
A setting that bonds the thick section may damage a thinner one. Inspect cooled trial pieces at each zone and test seam integrity by the package’s acceptance criteria. If the zones cannot meet the criteria together, consult the packaging supplier about a different bag design or sealing system rather than repeatedly raising the setting.
- • Test a representative filled bag, not a trimmed flat strip only
- • Check seam ends, folds and any crossings
- • Keep the trial results for the worst-performing zone
FABLE models to compare
FDR Series · Handheld Jaw Sealers · Specification sheet (PDF)
HI Series · Long-Length Hand Sealers · Specification sheet (PDF)
Technical references
Machine dimensions and formats refer to FABLE specifications. These references describe testing principles, not certification of any FABLE machine or packaging process.
Related sealing guides
Weak, Wrinkled or Burned Heat Seals: What to Check
Discuss your bag and application
Send the material, seam dimensions, expected quantity and destination power supply so we can review the shortlist with you.