High Frequency Acoustic Profiling for Multilayer Board Barrier Integrity
Inline high-frequency acoustic profiling measures micro-scale barrier delamination and polymer layer thickness across dynamic paperboard converting webs.
Extrusion Barrier Lamination
Process Specification
Industrial coating procedures involve the continuous application of a molten polymer curtain between two or more moving substrate webs to create a bonded functional structure. Through extrusion barrier lamination, converters introduce specific resins like polyethylene or ethylene vinyl alcohol into a paper or foil sandwich. The molten plastic acts both as an adhesive and as a functional shield against external contaminants.
Cooling rollers immediately solidify the polymer to set the bond.
Composite Architecture
Multi-layer packaging for food and liquids depends on these combined materials to prevent the migration of moisture and oxygen. During extrusion barrier lamination, the thickness of the resin layer is measured in microns to ensure it meets the shelf-life requirements of the product inside. Thin layers provide cost-effective moisture protection.
Specialized resin blends are necessary when a high gas barrier is needed to prevent spoilage or flavour loss.
Performance Barrier
Adhesion strength depends on the surface energy of the primary substrates and the temperature of the extrudate. Surface treatments such as corona discharge or primers are often applied to the paperboard before it reaches the lamination nip. If the melt temperature is too low, the bond fails and the layers delaminate during subsequent folding or filling steps.
High temperatures can cause unwanted odours or degrade the polymer properties.