Mayer bars
Posted: Thu Sep 16, 2010 8:49 pm
There is an interesting chart showing the wire size of Mayer bars vs. the wet thickness of the resulting layer at:
http://www.rdspecialties.com/Page.asp?Script=14
Years ago when I first tried Jeff Blyth's red-sensitive DCG, I thought there was a reference by Jeff or someone else stating that a Number 24 Mayer bar would produce a dry film thickness of around 10 microns. This is the thickness that Jeff specified for his MBDCG layers, but I can't find his specific reference to a number 24 bar. Does anyone remember that? (I think the gelatin percentage in his formula is around 12%.)
Until now, I didn't have a good method to measure layer thickness, so I don't know what my prior coatings were like. I'm guessing that a number 48 bar might give around a 20 micron dry thickness. Probably the best thing to do is make some TMG/MB (and R6G) DCG coatings with my 24 bar, do a series of measurements to get a handle on thickness, then order a larger size (maybe a variety of sizes) from RD Specialties based on those measurements.
http://www.rdspecialties.com/Page.asp?Script=14
Years ago when I first tried Jeff Blyth's red-sensitive DCG, I thought there was a reference by Jeff or someone else stating that a Number 24 Mayer bar would produce a dry film thickness of around 10 microns. This is the thickness that Jeff specified for his MBDCG layers, but I can't find his specific reference to a number 24 bar. Does anyone remember that? (I think the gelatin percentage in his formula is around 12%.)
Until now, I didn't have a good method to measure layer thickness, so I don't know what my prior coatings were like. I'm guessing that a number 48 bar might give around a 20 micron dry thickness. Probably the best thing to do is make some TMG/MB (and R6G) DCG coatings with my 24 bar, do a series of measurements to get a handle on thickness, then order a larger size (maybe a variety of sizes) from RD Specialties based on those measurements.