Patent ID: 6240844
Filing Date: 2001-06-05
Classification: B05C,B41C

Abstract:
A method of engraving a gravure cylinder having a circumference C for coating a liquid composition on a substrate, said liquid composition containing a concentration of particles having a predetermined particle diameter, said method comprising the steps of:(a) determining a coverage VA, of the liquid composition on the substrate;(b) selecting a stylus angle .theta.;(c) selecting a compression angle .alpha.;(d) specifying a first ratio (D.sub.B /D.sub.o) of said predetermined particle diameter D.sub.B to an engraving channel depth D.sub.o ;(e) calculating said engraving channel depth D.sub.o based on said first ratio (D.sub.B /D.sub.o) and said predetermined particle diameter D.sub.B ;(f) specifying a second ratio (W.sub.w /W.sub.o) of a wall width W.sub.w to cell width W.sub.o ;(g) calculating a channel width W.sub.c according to equationW.sub.c =[2 tan .theta./2]D.sub.o(h) calculating the cell width W.sub.o according to the equationVA=[1122.5/(tan .theta./2)]*[3 W.sub.o.sup.2 +2 W.sub.o W.sub.c +3 W.sub.c.sup.2 ]*[(2)/X]wherein X=W.sub.o +W.sub.c +2W.sub.w ;(i) calculating the wall width W.sub.w based on the second ratio; and,(j) engraving the gravure cylinder according to .theta., .alpha., W.sub.c, W.sub.w, and W.sub.o.