Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: C. W. Gibson: "Re: [COMPLIANCENET] Chemical Bleed and Feed Systems for Aqueous"
Previous message: Christopher Rhodes: "Re: [COMPLIANCENET] HADCO XL Agreement Signed"
Next in thread: SteveWentz@AOL.COM: "Re: [COMPLIANCENET] Chemical Bleed and Feed Systems for Aqueous"

I would like to get some information on what different companies are using for equipment to accomplish
Automatic Replenishment and Steady State Chemistry Control for Aqueous Dry Film Resists and Liquid
Photoimageable Soldermasks. I've heard that people purchase "systems" and other folks assembly the
individual components themselves. In addition, Is there anyone out there recycling the carbonate
solution? Any infomation, comments or recommendations would be greatly appreciated.

Sincerely,
Bob Daniels, Jr.
ECC Corp. - Jefferson, MA. 01522
1-508-829-5301 or HYPERLINK mailto:RDani20111@AOL.com RDani20111@AOL.com

Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: Christopher Rhodes: "[COMPLIANCENET] Call for Data on Airborne Lead Concentrations"
Previous message: Bob Daniels, Jr. - Ecc Corp.: "[COMPLIANCENET] Chemical Bleed and Feed Systems for Aqueous"

Bob, I no longer work in the industry, but was responsible for process control of devlopers when I did.

The active developing chemistry is the carbonate ion, either sodium or potassium. The action of spraying
carbonate slowly builds a concentration of bicarbonate in solution, slowly lowering pH and developing efficiency.
You may re-generate bicarb back to carbonate by adding the appropriate caustic (NaOH or KOH). You will need to do
some studies to determine if this is an economic advantage, after the effort spent to filter out the resist.

Feed and bleed systems are designed around a pH control, replacing the carbonate/bicarbonate solution with fresh
carbonate. It is also possible to use NaOH or KOH for this as well, until the solution becomes loaded with resist
chips, and starts to re-deposit on the panel.

The "nice" thing about using a vendors "system" is that they supply both the chemistry and the equipment, and you only
have 1 target if things go wrong. By building your own, you end up with greater flexibility on who you buy development
solution from (or build your own), but may not get great tech support from your supplier.

Hercules documented the carbonate/bicarbonate discussion and feed/bleeds in documents given to customers about 10 years ago
(its how I know this). I have found it to be a great reference.

Good Luck

Chris Gibson
Technical Director
Hawkins Chemical, Inc.
Minneapolis, MN

Messages sorted by: [ date ][ thread ][ subject ][ author ]
Next message: Lucille Servidio: "[COMPLIANCE N E T ] A Public Meeting on the Effluent Limitations"
Previous message: Christopher Rhodes: "[COMPLIANCENET] Closed-Loop Water Recycling Seminar: Oct 30 in"
Maybe in reply to: Bob Daniels, Jr.- Ecc Corp.: "[COMPLIANCENET] Chemical Bleed and Feed Systems for Aqueous"

Bob,
I am one of many vendors who would be happy to answer any questions you have regarding feed and bleed systems. To be honest there are very affordable feed and bleed systems out now offered by us vendors. They start at around $2,500.00 and go up from there. Of course vendors will offfer the feed and bleed controllers to you for free if you agree to purchase their developer for an agreed upon length of time. However as an ex-Plating Supervisor/Environmental Manager I would suggest buying the controller yourself keeping the chemistry vendors competitive and not signing any agreements limiting who you buy your developer from. This will give you the absolute best price on developer along with the best service possible. If you let a vendor buy you a controller and you pay it off by adding a few pennies to the cost of your developer over a time period of 1-3 years, what kind of service do you think you will get when you're locked into a fixed price and can't switch developers?

Steve