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Quick Answer
Start with the customer's current liner or target peel behavior, then test candidate liners with the actual adhesive. Do not select a release level only from labels such as light, medium or tight.
Why Adhesive Chemistry Matters
Acrylic, rubber-based and hot-melt pressure-sensitive adhesives can interact differently with the same release coating. Tack, flow, crosslinking, additives and coating weight affect wet-out and therefore peel behavior.
Light, Medium and Tight Release
These terms are useful for communication but are not universal specifications. A 'medium' release from one test method or supplier may not equal another. The numerical range, reference tape, dwell time, roller, peel speed, angle and conditioning should be defined.
Acrylic Adhesives
Acrylic PSAs cover a wide range of polarity and crosslink density. For stable selection, evaluate both initial and aged release and check whether release increases after heat or storage.
Rubber-Based Adhesives
Rubber/resin systems can show strong wet-out and may require a release coating designed for the specific tackifier package. Migration and storage effects should be considered.
Hot-Melt Adhesives
Hot-melt systems introduce both adhesive chemistry and thermal history. Liner selection should consider coating/lamination temperature, cooling, winding pressure and whether the liner must support a smooth adhesive surface.
Recommended Validation Sequence
Define the customer's target peel behavior; agree on a test method; screen two or three release levels; laminate with the actual adhesive; test initial and aged release; then run converting trials for unwinding, die-cutting and end-use peeling.
FAQ
Q: Can I specify only 10–20 g/in as the release force?
A: A numerical target is useful only when the test method and conditions are also defined. Otherwise results from different laboratories may not be directly comparable.
Q: Why does a liner that works with acrylic fail with hot melt?
A: The adhesive chemistry, wet-out and process temperature differ, so the release interface behaves differently.
Q: Should we test aged release?
A: Yes for applications where the liner remains laminated during storage or transport. Aged release helps reveal release-force drift.
Technical Note
Release-liner performance is application-specific. Values and material choices should be confirmed using an agreed test method and, where possible, the customer's actual adhesive and converting conditions.
