In extrusion lamination production, the lamination strength between the substrate and the film serves as a core indicator for product quality, directly determining the reliability and durability of composite materials during subsequent processing and end‑use. The laminating machine achieves firm bonding between different materials by evenly coating molten plastic onto the substrate surface. Relying on its in‑house R&D center for extrusion lamination technology, Nanjing sumino Precision Machinery Co., Ltd. analyzes how laminating machines deliver high‑strength lamination from three key dimensions: extrusion system, pressing process and cooling setting.

Stable performance of the extrusion system lays the foundation for lamination strength. After molten plastic flows out of the die head, it must form a melt curtain with uniform thickness and consistent temperature to evenly cover the substrate surface. Fluctuations in melt temperature or uneven flow rate will cause thickness deviation of the coating layer or premature local cooling, impairing the wetting effect of melt on the substrate and weakening interfacial bonding strength. Laminating machines from Nanjing sumino Precision Machinery adopt a high‑precision temperature control system and pressure‑stabilized die‑head design to guarantee consistent flow characteristics and temperature distribution of the melt across the full web width, laying a solid foundation for reliable lamination.

Pressure and temperature of the pressing rolls are critical control points for lamination strength. The melt contacts the substrate at the pressing rolls for cooling and setting. Laminating machines manufactured by Nanjing sumino Precision Machinery are equipped with independently temperature‑controlled silicone pressure rolls and mirror‑finished cooling rolls. By precisely adjusting pressing force and roll temperature, the melt can fully wet the substrate surface to form robust mechanical anchoring and intermolecular bonding. To accommodate differences in surface properties and temperature resistance of various substrates, pressure rolls of varying hardness and differentiated surface treatment processes can be selected to further optimize bonding performance at the lamination interface.

Cooling and setting provides the final guarantee for lamination strength. The laminated material requires rapid cooling to lock in the interfacial bonding state. Laminating machines from Nanjing sumino Precision Machinery adopt multi‑segment cooling roll groups assisted by air‑cooling systems. This keeps materials flat during setting and reduces delamination risks induced by internal stress. Through systematic coordination of the extrusion system, pressing process and cooling‑setting unit, the laminating machine can steadily produce high‑quality composite materials featuring superior lamination strength and robust interfacial bonding.