1. DiSSOLVING
The process begins by using high grade copper and dissolving it in acid to produce a copper electrolyte solution.
The introduction of chemical additives to the solution allows the modification of the mechanical properties of the base copper foils.
The electrolytes are monitored by a computerized process automation system and supervised by the process control department in order to ensure the consistency of the solutions.
2. PLATING
When the electrolyte solution meets all chemical and quality standards, it is pumped through filtering systems into large plating tanks containing partially immersed titanium drums. Each of them slowly rotates and is polarized against a conforming anode.
As the drum rotates, a thin film of very pure copper is electrodeposited onto its surface.
At this stage, the drum side of the foil is smooth and shiny, the other has a precisely controlled-crystalline structure with a matte appearance.
3. TREATING
The rolls of base foil are now processed through a sequence of chemical and electro-chemical processing steps.
Bonding treatments are applied to the foil and provide an enhanced surface for wetting by resin systems during laminations, thus ensuring the integrity of adhesion to the dielectric substrate.
The final processes apply protective chemical conversion coatings that prevent corrosion to both the shiny and matte surfaces during storage or lamination. These treatments produce a base foil with all specific final product attributes required by the customer.
4. SLITTING & SHEETING
After a series of stringent manufacturing quality control tests, the foil is taken to the slitting department for final inspection and slit to the precise widths required by the customer.
Pre-cut copper sheets are available in various sizes for customers who required their orders delivered in sheets.
All our foils pass through surface cleaning equipment that removes any loose microscopic particles immediately prior to the final protective packaging.