Marco at NEC-CPI wrote ----- Begin Included Message ----- Hi Guys, I have a problem with dimensional stability of photo tools. The photo tools shrink after processing. I've tried increasing the drying temperature (50-55C) just so it will not shrink but it still does. This is really giving me a headache. Any suggestions? Marco Biagtan NEC-CPI Process Engineer ------End Included Message--------------- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ The problem with silver halide film is it's dimensional stability to humidity changes. Silver film specs quote dimensional stability to be .012% per deg RH change over 24 inches, whereas the thermal coefficient is .0009% per deg F for 7 mil film. The solution is to switch to a dry process system using dry plot film which has a thermal coefficient of .00085% per deg F for 4 mil film and a humidity coefficient of .0009% per deg RH. Dick Desrosiers [log in to unmask] ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################