Many thanks for this detail Wayne
Rich Kraszewski
Senior Staff Process Engineer
Plexus
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Showers
Sent: Thursday, May 10, 2018 8:36 PM
To: [log in to unmask]
Subject: Re: [TN] Liquid Latex Masking for Wave Soldering
I use 2 different materials and processes and used UV cure in a prior timeline:
Present:
If I have high volume, with SMT or through-hole, at least pre-wave on only a single side, I use Lackwerke Peters SD2950 series. It costs a few pennies a PCB and the PCB Supplier puts it on. Saves time and labor and has an excellent seal. You will have to design a masking layer to go with the PCB files, but not a bad way to go.
If it is just general run of the mill, I use Wondermask 2211 (Pink, non-staining). It is air dry and will also final cure over the pre-heaters. Otherwise it is an hour (or 2) to air dry.
Prior:
For UV Masks, I used a benchtop dispenser and a UV-A curing station (10 seconds) although I could have probably dialed it back to 5 seconds as it set up pretty quick. I tried a short UV tunnel (12 inches) right on the line, but did not remind the operator after the tunnel to flip the PCB over BEFORE they started putting parts in, so I cured offline after that mistake. I used the Dymax 9-20515 (RED).
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