Al Substrate CCL Production Line

Al-CCL is an Aluminum-based copper clad laminates with good heat dissipation function. Generally, Single layered Al-CCL panel is composed of a three-layer structure, which is a circuit layer (copper foil), an insulating layer and a metal of aluminum base layer. For high-end use, it is also designed as a double-sided board, and the structure is circuit layer, insulating layer, aluminum base, insulating layer, and circuit layer. Very few applications are multi-layer boards, which can be formed by bonding ordinary multi-layer PCB with insulating layers and aluminum bases.

China has mature production for Al-CCL sheets; factories practiced in below many kinds ways operation:

1. Screen Printed insulating glue Aluminum sheets + copper foil laminates.

2. Aluminum sheets + prepreg + copper foil laminates.

3. Aluminum sheets + polymer film + copper foil laminates.

4. Aluminum sheets + commercial insulating glued copper foil laminates.

Here are two factors:

5. Thermal conductivity for insulating media.

In Al-CCL sheets, Thermal conductivity ratio is subject to above insulating glue, polymer film, prepreg or insulating glued copper. For high grade Al-CCL, is made by prepreg, printed glue Aluminum or polymer film; for normal and led lighting purpose, commercial glued copper foil is widely adopted.

From view of factory production. In the screen-printed insulating-adhesive route, the adhesive must be printed repeatedly to reach the required insulation thickness. This may increase the defect rate, so few factories in China use this process. Prepreg lamination can leave substantial epoxy resin on the press plates. The production cycle should therefore account for automatic press-plate cleaning and a reversing connection when continuous production is required. Polymer film can achieve high grade thermal conductivity ratio, its finishing is mainly for high grade Al-CCL sheets. In China, the most common process uses commercially available copper foil coated with insulating adhesive, with an overhead lifting system at the raw-material loading stage. Polymer film sheets can also be added during loading for higher-grade Al-CCL sheets.

6. Aluminum plate heating dissipation.

This is dependent of Aluminum thickness, aluminum purity and circuit thermal heating dissipator conducting shape.