How do extrusion coating machines achieve high-strength lamination between substrates and films?

In the field of composite material manufacturing, extrusion coating machines apply molten plastic evenly onto substrate surfaces to create high-strength lamination between films and materials such as paper, non-woven fabrics and aluminum foils. Lamination adhesion is a core indicator for evaluating the quality of coated products. Relying on its dedicated R&D center for extrusion coating technology, Nanjing sumino Precision Machinery Co., Ltd. guarantees superior lamination strength through optimized processes across all production stages.

Uniform extrusion coating lays the foundation for strong adhesion. After flowing out from the die head, the molten plastic forms an evenly thick melt curtain that fully covers the substrate surface. Our extrusion coating machines adopt a coat-hanger die and a precision temperature control system, ensuring consistent melt distribution across the full width. This prevents reduced peel strength caused by uneven coating.

Pressure and temperature of the laminating rolls are critical to reliable adhesion. The molten material bonds with the substrate at the laminating rolls and cools down for shaping. Our machines are equipped with independently temperature-controlled silicone laminating rolls and mirror-finish cooling rolls. By precisely adjusting laminating pressure and roll temperature, the molten plastic fully wets the substrate surface, forming robust mechanical anchorage and intermolecular bonds. To match the surface properties of different substrates, laminating rolls of varying hardness and specialized surface treatment processes are available for further improved lamination performance.

Cooling and shaping safeguard long-term adhesion. The laminated material undergoes rapid cooling to stabilize the bonding interface. Fitted with a multi-section cooling roll group and auxiliary air cooling system, our machines keep the material flat during shaping and lower the risk of peeling caused by internal stress.

With systematic coordination of extrusion coating, lamination, cooling and process parameters, our extrusion coating machines steadily produce high-quality composite materials featuring excellent lamination strength and smooth surfaces, fully meeting customers’ requirements for stable quality and high-volume production.