On October 18, 2018, Customers Son and Nguyen from Vietnam visited Best Technology. At first, they visited our office and would like to know more about the Flex PCB design. So they came to our Flex PCB for visiting.
Picture1: Watching the sample album of FPC
During visiting the FPC factory, they learned more details about our workshop and the FPC manufacturing process.
Picture2：Visiting the workshop of the factory
Picture3: Visiting Flex PCB equipment
After they know the product and the manufacturing process in further, customers and we both believe that Best Technology is able to provide the most suitable products and the most satisfying service for our client!
Picture4: Taking a photo
BEST always be your best choice of Flex PCB. And we hope the partnership can enhance our capability to supply our customers with good quality Flex PCBs.
Differences between Roll Anneal Copper Foil and Electrolysis Deposition Copper Foil
Roll Anneal Copper Foil (RA copper):
Formation: Roll copper block many times, and then do the annealing treatment with high temperature. The shape of its crystal is lamellar structure.
Advantage: Soft, smooth surface, suitable for flexible PCB and small lines.
Shortage: high cost
Electrolysis Deposition Copper Foil (ED copper):
Formation: Melt copper into dilute sulfuric acid, it becomes bluestone solution.
Through a high electric field, copper attach on the metal drum. With the rolling of metal drum, thin copper foil finally formed.
Advantage: Low cost
Shortage: Unsuitable for small lines; bad bending resistance.
Here is the cross section observation of RA Copper and ED Copper:
As you can see, there’re adhesive in base for each four basic thickness of 2L (double sided) flex circuits, if you need more thin, then you can use adhesiveless material, and final thickness will be thinner even you use the same copper and Polyimide thickness. Please see next article (to be continued…)