VFFS Demonstration: Test the Buyer's Actual Packaging Film
For a vertical form fill seal machine, require a demonstration using the buyer's own packaging film and confirm bag dimensions within the reference ranges before acceptance.
Before signing off on a vertical form fill seal machine, require the demonstration to run the buyer's actual packaging film, not a supplier sample. Film behavior drives sealing, tracking, and bag formation, so a trial on unfamiliar stock tells you little about your line.
In the request for quotation, ask the supplier to state which film structures and thicknesses were run in the demonstration and whether the buyer's film will be used. Compare the reference bag length of 80–400 mm, bag width of 200–295 mm, and film width of 420–620 mm against your intended pack sizes, and ask how the machine is set for each. During the demonstration, check seal quality, film tracking, and bag consistency across the full range you plan to run. For acceptance testing, define sample quantities and pass criteria in advance, and confirm who supplies the film for the test.
Before requesting a quote, confirm with the supplier whether a demonstration on your own packaging film is available, what film samples and quantities are needed, and how results will be documented.