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Plant-floor overview. Unlock below for the full converter checklist.
Form-fill machinery needs hot tack: the coating must hold while it is still hot so the air blast that keeps the tube open, or the weight of the drop, does not open the bond before it cools. This is a common spring test for blends of EVA vinyl resins and wax. It is a lab screen. Final choice still belongs on the packaging machine.
You get (1) maximum bond while the seal is hot and (2) the jaw-temperature and dwell window. A wider window is easier to run. Figure 3-4 in the original PDF shows medium, high, and ultra-high hot-tack profiles.
A 0.4 oz/in spring best matched case packagers and check-weigher / fill-weigh machines. A 0.6 oz/in spring was closer to other packaging machines.
What's in this guide
- Equipment
- Procedure
- Calibrate the spring
General plant guidance only — not a substitute for your process, SDS/TDS, or line trials. Call 800-249-0337 to match a grade.