Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Conformal Coat Masking

Wayne Smith

#20870

Conformal Coat Masking | 25 July, 2002

I've been tasked with increasing the CCA throughput in our Conformal Coating workcenter.

My first approach will be to look into a more *automated* approach for the masking process. We currently use a manual method of using masking tape prior to conformal coat.

Anyone out there with experience in a "smarter" approach to cc masking. The use of custom fit rubber boots, protective fixtures, etc ?

Process recommendations?

Vendor recommendations?

Thanks! Wayne Smith

reply »

#20880

Conformal Coat Masking | 25 July, 2002

Consider: * Quitting the coating business all together and using a coating service supplier, like: Thermospray Co 800-952-5838 Mike Moninger; Advanced Coating 800-722-1444; Epsco 108 W. 37th St Boise Idaho 83714 (208)389-2000 * Buying a programmable spray machine from a company like: Nordson. * Looking at http://www.hq.nasa.gov/office/codeq/doctree/87391.pdf

* Talking to your coating materials supplier. They usually have technical types that provide a wide range of experience. * Using a water soluble temporary solder mask to cover excluded areas, being careful to select one that doesn�t clog your waste water recycling system. * Using a peelable temporary solder mask to cover excluded areas, being careful to select one that doesn�t leave ionic residue on your board. * Making templates by soldering brass stock tubes and bars into a single piece to cover the excluded areas that you set on the board prior to spraying. * Purchasing �rubber� boots that press over or set on top of the excluded areas.

reply »

#25343

Conformal Coat Masking | 4 August, 2003

Dave,

Where can I get the rubber boots you are talking about?

We are going to have to start doing 100% conformal coating of boards for some of our customers in high volume, we currently only do a selective coat.

We currently use a silicon coating, is this an appropriate coating for 100%?

I will give my vendor a call but I would like to be a little informed beforehand.

Thanks

James

reply »


CAL

#25346

Conformal Coat Masking | 4 August, 2003

Hi Wayne- You may want to contact Brian Toleno at Loctite. Brian Chairs the IPC Conformal Coating Committee for IPC. Brian can be contacted at brian.toleno@loctite.com

Regards, Cal

reply »

Pete B

#25348

Conformal Coat Masking | 4 August, 2003

The masking boots can be obtained from Sinclair and Rush - their web address is http://www.sinclair-rush.com

Regarding the type of conformal coat material you require that is down to the service environment/product life expectancy etc. etc. What does your customer(s) require?

reply »

A

#25350

Conformal Coat Masking | 4 August, 2003

#25353

Conformal Coat Masking | 4 August, 2003

Don't forget to look into Nordson's coating equipment, it's more expensive than the other's but you get what you pay for.

reply »

A

#25354

Conformal Coat Masking | 4 August, 2003

FYI: Nordson lover. Asymtek is a Nordson company. The Nordson SelectCoat is on the Asymtek web site

reply »

Marian Hargis

#29835

Conformal Coat Masking | 4 August, 2004

You an also look at Kinnarney Rubber Company: http://www.kinnarney.com

reply »

Rush Fan

#29836

Conformal Coat Masking | 4 August, 2004

Wayne,

I was in a very similar situation as yours a few years ago. All of the replies here are very good. I'd also consider trying to contact an outfit in Ocala, Florida known as KenPrep Services. The number I have is 904-687-3659. I believe the owner passed away a few years back, but I was talking to what I believe may have been his son, or other company representative. They turned out a nice, custom fit rubber boot. If you consider this, hopefully they are still in the business!

reply »

reflow oven profiler

FPC* - Fluid Pressure Control - Dispensing Pump