Hello,
     Our company largest DS PCB manufacturer in Malaysia.We are 
     encountering
     the soldermask skip problem.I give below the parameters used.
     
     M/C Burkle Curtain coater
     Ink Peters GL2469sm
     
     Viscosity 60to65
     Beltspeed 78m/mim
     web weight 6.4to 6.8gms/600sqcm
     
     We use pattern plating process and plating thickness 40to 60 microns.
     
     The Sm skip is random and happens near closely spaced tracks(most of 
     the times).
     
     I Shall be highly grateful if anyone can give info to minimise the
     sm skip problem.
     
     Thanks
     R.Srinivasan
     
     Likom PCB SDN BHD
     Malacca Malaysia
     
     E-mail :[log in to unmask]