Contact Angle Goniometry Protocols for Polyolefin Lamination Adhesion Verification
Sessile contact angle goniometry isolates polar and dispersive surface energy to verify polyolefin corona treatment and prevent lamination delamination.
Polyolefin
Synthetic Resin
Class of synthetic resins produced from simple alkenes like ethylene or propylene forms the basis for many modern flexible packaging films and heat seal coatings. Within the packaging industry, polyolefin is valued for its moisture resistance and the ability to create strong thermal bonds at relatively low temperatures. It includes common materials such as polyethylene and polypropylene.
Functional Property
Extrusion coating processes apply a thin layer of the resin onto paper or board to provide a barrier against liquid penetration. Because polyolefin is chemically inert, it does not react with food or pharmaceutical contents and maintains the purity of the packaged goods. The material becomes molten when heated and flows into the fibrous surface of the substrate to create a permanent mechanical anchor.
High clarity versions are used for overwrap films while opaque versions provide a base for metallic decorations. Recycling systems often separate these plastics from the paper fibers during the pulping stage to recover the cellulose for new products.
Processing Limit
Thermal degradation begins if the material is held at excessive temperatures for long periods in the extruder. Most polyolefin grades are designed to withstand the heat of sealing jaws without sticking or scorching.