Our thoughts on 'swell' rollers Dave Sullivan Rockwell Collins, Inc. ______________________________ Forward Header __________________________________ Subject: Re: FAB:Roller swelling Author: pmcarter at po5 Date: 1/8/97 5:31 PM Yeah, my first hunch would be either the antifoam (some of the early ones were notoriously loaded with butyl or other glycol ethers as an "extender") or the proprietary developer solution. Some proprietary developer solutions have a glycol ether or a similar organic "extender/stabilizer" to make it look like it can stand a higher loading factor (more square feet of resist per gallon). You don't mention whose ThermoPlastic Elastomer was used to mold the roller sleeves (DuPont's Alcryn is one possible candidate), but if you can find that out, they, or Chemcut, might be able to help you sort out the chemical incompatibility. Of course when the developer still appears to develop, but has a viscosity approaching that of blue maple syrup, it is entirely possible to have a rinsing issue or two, especially as the city water temperature drops. There are/were organic constituents in some of the resists, that in concert with one of the materials above, might be expected to swell some synthetic elastomers Marc Carter,ex-resist person ______________________________ Reply Separator _________________________________ Subject: FAB:Roller swelling Author: ddsulliv at po6 Date: 1/8/97 4:31 PM What do you think about this. I've seen it on stripping solutions and antifoam 86 from Dynachem. ______________________________ Forward Header __________________________________ Subject: FAB:Roller swelling Author: [log in to unmask] at ccmgw1 Date: 1/8/97 3:10 PM I recently encountered a problem with a Chemcut developer's (series 2000) rollers. The rollers were coated with TPE rubber. The rollers swelled up allowing the aluminum core to spin freely, obviously not allowing boards to pass through the machine. It is unclear as to what caused this problem. Several factors have been changed within the last 3 months. A new developer solution has been in use on a feed and bleed system. Two new anti-foam chemistries were tried. A new film was evaluated for about 2-3 weeks. Of these changes, does anyone have experience with a similar problem, and could you identify any potential incompatibility issues. I would rather not list the specific vendors, but would like to know if a specific chemical reaction might cause this. Thanks in advance. *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************