A longitudinal seal formed when the inside sealant surfaces meet and the joined edges project like a fin.
Why buyers encounter it
Fin-seal compatibility depends on the web orientation and sealant surfaces. Confirm the actual wrapper and package drawing.
Buyer diagramReference diagram for fin seal.
Use the term carefully
This definition helps interpret a packaging conversation. It does not establish a complete film structure, machine setting, regulatory conclusion, shelf-life result, or approval for a particular application.
Research source: PC-078. Application-specific details remain subject to manufacturer and technical review.
