Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
Kiwo Discharge tests in the M&R booth in Nashville on the LED was 2 seconds on a 250 mesh.
Quote from: dirkdiggler on May 27, 2014, 02:25:33 PMKiwo Discharge tests in the M&R booth in Nashville on the LED was 2 seconds on a 250 mesh.I dunno the brand but watched M&R do as PP at 3-4 seconds on a LED Starlight.For us at 3-4 second burn wouldn't speed us up in our CURRENT configuration. Takes about 30 seconds or so to wash out a screen, so burning faster than that wouldn't be much help. Right now we can burn and wash (2 people) in a constant flow on Diazo.
I was thinking the other day about this thread and the few LED shops that have mentioned moving to a dual cure emulsion because the pure photopolymers are exposing so quickly and I'd like to know why someone would do that. One of the advantages of LED is speed and if you can develop a stencil in 10 seconds then that's awesome and moving to a dual cure will erase a huge portion of time savings and you'd be going back to taking about the same amount of time to expose a PP emulsion on a strong metal halide unit.I also haven't played around with other PP emulsions with regard to exposure latitude but this HVP is unbelievable. I exposed a 150/48 for 2 light units the other day then a 180/48 for 20 LU's for a difference of 18 LU's and they both sprayed out with ease. I also did a 305 for 1 LU and it developed just fine with no slime on the squeegee side and it held up for a 150 piece plastisol run.Does anyone have another PP emulsion they'd mind doing some testing on? It would be easy to let a screen expose for a bit longer than usual and share the results. Hopefully you won't ruin any screens if the latitude is somewhat decent.
HVP and Photocure Pro are the only two emulsions you really need. I have tried all the others. I always end up back with these.