How does the extrusion coating machine achieve high-strength lamination between substrate and film?

In the field of composite material manufacturing, extrusion coating machines evenly apply molten plastic onto substrate surfaces to achieve high-strength lamination between films and materials such as paper, non-woven fabrics and aluminum foils. Bonding strength is the core criterion for evaluating coated product quality. Supported by its exclusive R&D center for extrusion lamination technology, Nanjing sumino Machinery Co., Ltd. ensures superior bonding performance through comprehensive process control.

Uniform extrusion coating forms the foundation of reliable bonding. After flowing out of the die head, molten plastic forms an even melt curtain and fully covers the substrate. Our extrusion coating machines adopt coat-hanger die heads and high-precision temperature control systems, maintaining uniform melt distribution across the full material width and preventing reduced local peeling strength caused by uneven coating.

Pressure and temperature of laminating rollers act as key factors for stable bonding. The molten material combines with the substrate and shapes during roller pressing and cooling. The machines are fitted with independently temperature-controlled silicone pressing rollers and mirror cooling rollers. Precise adjustment of pressing force and roller temperature enables full infiltration of molten plastic on substrates, creating firm mechanical anchorage and intermolecular bonding. Press rollers with varying hardness and customized surface treatment processes can be selected to match different substrate characteristics and optimize lamination results.

Cooling and shaping guarantee stable bonding performance. The combined materials undergo rapid cooling to fix the interfacial bonding state. Equipped with multi-stage cooling roller groups and auxiliary air cooling systems, the equipment keeps materials flat during shaping and minimizes peeling risks triggered by internal stress.

With coordinated control of extrusion coating, pressing cooling and process parameters, the extrusion coating machine steadily manufactures high-quality composite materials with strong bonding force and smooth surfaces, satisfying customers' requirements for stable production quality and yield.