PCB007 Magazine


Issue link: https://iconnect007.uberflip.com/i/1484263

Contents of this Issue


Page 46 of 115

NOVEMBER 2022 I PCB007 MAGAZINE 47 References 1. "Process Guidelines for Cupric Chloride Etch- ing," Chemcut.net Christopher Bonsell is a chemical process engineer at Chemcut. To read past columns, click here. regulations and safety precautions add up to making it more expensive than the counter- part options. If you do get the opportunity to use Cl 2 for regeneration, you should note that feeding it into your etching system will be a different process than the previous options. To bring the Cl 2 into your etching solution you will need to pull it into your etcher by vacuum. is vac- uum will pull the Cl 2 from the storage tank and introduce it to the spent etchant via sparging or feeding into a recirculating loop (see Fig- ure 3). is feeding method is a safety measure to prevent major releases of Cl 2 in case there is a leak in one of the connections between the tank and the etcher. Summary Regenerating CuCl 2 can be relatively sim- ple, and it is mostly a matter of picking which option you want. Which option you choose will likely depend on your location. e best option to go for is chlorine gas regeneration because it is cost-effective, but depending on your location, there may be too many regula- tions and barriers to entry for that to be a fea- sible option. If Cl 2 is not a valid choice for you, then the other two options can come down to many different factors that can be unique to your process. With the information I have pro- vided, you should be able to make an informed decision about which one would suit your cupric etch process best. PCB007 Figure 3: A free-standing regeneration unit designed to pull chlorine gas in by vacuum and introduce the gas into the etchant.

Articles in this issue

Links on this page

Archives of this issue

view archives of PCB007 Magazine - PCB007-Nov2022