Migration Testing Conditions That Do Not Match Your Filling Line
Matching migration simulant and thermal parameters to exact filling line mechanics prevents compliance invalidation during customs and market audit checks.
Extrusion Barrier Board
Composite Substrate
Packaging manufacturing relies on multi-layer materials that combine the mechanical strength of paper with the protective properties of polymers. An extrusion barrier board is created by applying a molten resin directly onto a paperboard web during high-speed run operations. This structure prevents moisture or grease from migrating through the paperboard.
The material is used in frozen food cartons and liquid packaging where moisture resistance is required. By bonding the polymeric film directly to the fibrous matrix, the resulting material retains its stiffness while blocking external liquids.
Coating Technology
Coating application involves a heated die that extrudes a thin film of polyethylene or bio-synthetic polymer. To ensure adhesion, the paperboard substrate must undergo corona treatment to activate the surface molecules. Incorrect melt temperatures cause pinholes or delamination during downstream converting.
This control determines the overall integrity of the finished carton.
Barrier Performance
Preventing the transmission of water vapour is the primary function of the polymer layer. An extrusion barrier board blocks moisture to preserve the freshness of dry food products. It also prevents the oil from greasy foods from staining the exterior of the package.
This protection is evaluated by measuring the water vapour transmission rate under humid conditions.