How does Aluminum Polymer Laminated Board Extruded Sheet Work?

Aluminum polymer laminated board extruded sheet is a functional sheet that achieves metal-polymer layer fusion through co-extrusion process. Its core process is to simultaneously complete plastic matrix casting and metal surface compounding. The process includes three key technical stages:

Interface pretreatment mechanism

The aluminum strip surface is chemically converted to form a porous oxide layer, and the microscopic anchoring structure provides a physical bonding point for polymer penetration. The electrostatic dust removal device ensures that the metal layer is isolated from pollutants in the high-temperature compounding area. The traditional step-by-step compounding process has the risk of interface failure caused by aging of the adhesive layer.

Co-extrusion compounding process

How to achieve heterogeneous material fusion?

The thermoplastic medium forms a molten curtain through the diverter die, which wraps the preheated traveling aluminum strip under controllable pressure. The temperature gradient field causes the polymer molecular chain to embed into the micropores on the surface of the aluminum material, and the cooling process forms a mechanical interlocking interface. The overlying aluminum strip is precisely aligned and then subjected to secondary compounding, and the double-sided stress balance design avoids sheet warping.

Online quenching and tempering control

The calendering roller group of aluminum polymer laminated board extruded sheet corrects thickness fluctuations in real time, and the water mist cooling system accurately controls the crystallization rate through phase change heat exchange. The aging treatment chamber releases composite stress and eliminates the tendency of interlayer separation in later processing.

Structural and functional characteristics

The polymer core layer absorbs vibration energy and blocks the conduction path of sound waves between metal layers. The sealing barrier formed by the aluminum-plastic interface blocks the longitudinal penetration of water vapor and eliminates the accumulation of condensed water on pure aluminum sheets. The continuous extrusion process ensures the uniformity of longitudinal performance and overcomes the anisotropic defects of metal roll-pressed products.