Ahne, 1. We run the stencil cleaner at room temperature - maybe colder when water is changed 2. we use smartsonic 440-R smt detergent made for the cleaner 3. We use a standard smartsonic ultrasonic stencil cleaner 4. Production told me they change the detergent when the boards are not clean after the cleaning cycle is done. I am not comfortable with this method. What does everyone recommend for changing the cleaning solution? Tenison Stone "Ahne Oosterhof" <[log in to unmask]> on 02/20/2001 10:06:48 AM Please respond to <[log in to unmask]> To: "'TechNet E-Mail Forum.'" <[log in to unmask]>, <[log in to unmask]> cc: Subject: RE: [TN] Stencils with glue releasing Good morning Tenison, We are in the business of making stencils and have learned a few things about glue and how well it holds up. The major reasons why glue may let go: 1) The cleaning temperature is too high. Most glues and epoxies used to attach stencil plates to the mesh and mesh to the frame is chosen to release at temperatures over 140F. I suggest you try to keep your cleaner temperature below 120F. 2) Using a cleaning solution that attacks glues and epoxies. Several brands of these materials will dissolve glues, especially when used at high concentrations. Never use these materials at concentrations higher than recommended by the manufacturer and try to stay well below them if possible. 3) Ultrasonic cleaning ( and sometimes high pressure cleaning) may have an impact on glue attachment and may cause a slow, progressive release of some glues. 4) Over time and use the solution in your tanks may change drastically due to the addition of the residues you are removing from the stencils. Keep track of the contents of the tanks. Please give me a call to discuss your specific problem and how you can resolve it. Regards, Ahne Oosterhof A-Laser, Inc. (503)641-9428 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask] Sent: Tuesday, February 20, 2001 05:35 To: [log in to unmask] Subject: [TN] Stencils with glue releasing Hi everyone! My problem today has to do with stencils for solder paste printing. We are having a lot of problems with the glue releasing when we go to use the stencil. Packing tape will hold through the end of the job. The temperature is OK and the time in cleaner is acceptable according to the stencil vendor. We have checkout our stencil cleaner and the parameters on the various printers. We have had our stencil cleaner for many years and only had the problem in the last year.' We have had no luck with the problem and the stencil vendor is also confused. Has anyone had this problem before and found a solution? Tenison Stone Telex Communications ---------------------------------------------------------------------------- ----- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------- ----- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------