"He who marches out of step hears another drum." ~ Ken Kesey
Quote from: mimosatexas on August 05, 2016, 06:16:20 PMIs anyone out there using a non-diazo emulsion for high eom with thin thread mesh and not having delamination issues? Just trying to troubleshoot.I have been working with Saati on this... we still have random delamination issues on thin-thread... thick thread is nearly bullet proof, but throw thin thread into the mix, and EOM from 12% up to 50% fail (they all will fail at the higher end, above 30%)...We've tried: starlight, saati multi-300, even sun exposures, everything post exposed for a LONG time in the sun or on the multi 300....Different emulsions, (even sp1400 sometimes had delam issues -- although less than ANY of the photopolymers we've tried)... Murakami, Kiwo, Chromaline, Ulano, Saati ... we thought we had the problem solved with mesh abrasion, but it wasn'tand before you ask, the Saati screens have been imaged and checked out by their pros, so it's not an under-exposure issue.. if anything, we're OVER exposed.The issue seems to be made worse by more pressure, and higher off-contact, along with sharp/hard squeegees.
Is anyone out there using a non-diazo emulsion for high eom with thin thread mesh and not having delamination issues? Just trying to troubleshoot.
Last off, eom is kind of an "empty" metric in that it only talks about how thick the dried emulsion layer is relative to the mesh thicnkess. It doesn't provide information on where that emulsion resides relative to the mesh. For the purposes of this discussion, we might be just as concerned with the emulsion on the ink side as the substrate side. My point is that a face coat may work wonders if you are having delam issues.
It could be a bad batch, but it is absolutely like peanut butter. Had to card it toward the mesh while in the trough. It just wasn't moving with gravity...Good to know about the exposure vs post exposure. I know with sp1400 a hard 7 is fine, but the screen only gets more durable the longer I leave it under the light.