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How to measure hot tack of an EVA hot-melt coating using a modified spring test
Two spring methods: A picks a heat-seal window on low-to-medium hot tack; B profiles extrusion-grade lid stock in grams vs temperature. Call 800-249-0337.
Hot tack is the resistance of a heat seal to a force applied right after the jaws open, before the seal cools. Form-fill needs it. A calibrated spring can apply that force. Two procedures: A for low-to-medium hot tack (pick a seal window); B for high-performance extrusion-grade lid stock (max grams, then plot hot tack vs seal temperature).
What's in this guide
- Equipment
- Procedure A (low-to-medium)
- Procedure B (extrusion-grade lid stock)
- Results
General plant guidance only — not a substitute for your process, SDS/TDS, or line trials. Call 800-249-0337 to match a grade.