Electronics Forum | Wed Apr 26 01:48:07 EDT 2000 | Eric Chua
Hi Steve, What type of chemical used for washing stencil. Must be take note. Thanks.
Electronics Forum | Fri Apr 28 21:33:01 EDT 2000 | JP
I had a similar problem. We wold begin to notice the debonding within hours after recieving the stencils. As it turned out, our stencil vendor, located in CA, was shipping the stencil to our facility, located in ND, before the epoxy was fully cured
Electronics Forum | Tue Apr 25 18:51:06 EDT 2000 | Steve Thomas
We have quite a few stencils that either are debonding, have debonded, or we suspect will debond when we can least afford for it to happen. The epoxy is coming loose from the foil, but remains attached to the webbing. All the stencils that are comi
Electronics Forum | Wed Apr 26 11:52:17 EDT 2000 | Steve Thomas
I knew I was forgetting something. We use Smart Sonic 440-R, a mildly alkaline (ph 12.4 in the concentrate, we dilute to about 10%) detergent that they obviously recommend for use.
Electronics Forum | Tue May 02 14:19:26 EDT 2000 | Bill Schreiber
There are two primary causes of epoxy adhesive bond failure, heat and over exposure to moisture. Ultrasonic cavitation is a only a mechanical "scrubbing" action on a microscopic level. However, if the adhesive bond is week or has small areas of det
Electronics Forum | Mon May 01 17:12:42 EDT 2000 | Joe
I have the same equipment and the same chemicals and have had the same problem. The part of the stencil which is glued to the mesh is being destroyed by the ultra sonics in the equipment. The only solution I found is to seal the glued part of the ste
Electronics Forum | Tue May 02 17:26:33 EDT 2000 | Steve Thomas
As I understand it, though, a 90 sec. 75F wash and a 15 second rinse (plus the lift cycle, another 10 secs., perhaps) at a MAX. of 110F isn't supposed to be nearly enough of a swing to swell that epoxy or expand the foil. According to my contacts at
Electronics Forum | Fri May 12 13:42:38 EDT 2000 | Steve Thomas
I also recommend that you take a peek at the archives, as stencil cleaners have been discussed a number of times. I also recommend that you check with your stencil manufacturers to determine exactly what cleaning process parameters are acceptable to
Electronics Forum | Tue Nov 16 14:10:30 EST 1999 | Bill Schreiber
According to a paper by Richard Clouthier, published in 1996, there are two major factors about normal cleaning chemistries that may affect stencil adhesives. 1) Elevated temperature above 110 degrees F. (45 degrees C). Stencil adhesives are heat c
Electronics Forum | Sun Mar 07 13:10:15 EST 1999 | Sam Sangani
| Has anyone used the mechanical stencil foil tensioning system from certain company that eliminates using stencil frames and epoxy & mesh? Any comments on whether it's worth looking into? We go through product revisions like we go through clean so
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