Rob, Most of the SMT adhesive is a moisture cure material. Typically these are cured in an oven as the moisture is driven out of the adhesive. At ambient temperature the adhesive will cure very slowly. If you clean the nozzles daily, you should be in good shape. Soaking in proponol will basically dry out the adhesive and could harden it up. Some of the more radical chemicals, and ultrasonics can help clean. I prefer using a small ream, an air gun, and some proponol for rinsing. If the adhesive is less than 24 hours old, it should be uncured, and easy to remove. We buy some boxes of EFD dispensing tips (they have some very small sizes) and use them as reams to clean out the nozzles- if there are jams. Typically, fresh adhesive is easily blown out with an air hose, and with a rinse of proponol, and some more air, the nozzle should come perfectly clean. I know that both Fuji and Camelot charge an arm and leg for their nozzles, so it pays to clean them every 12 hours, or at least every 24 hours. If you let them get dirty, the orifice will start to close on you, and upset the delicate balance of adhesive surface tension between the nozzle to the board, and stringing, or inconsistent dot sizes will follow. Steve > -----Original Message----- > From: Rob Day [SMTP:[log in to unmask]] > Sent: Monday,June 18,2001 6:09 AM > To: [log in to unmask] > Subject: [TN] Glue Nozzle Cleaning > > Hello Folks, > > We have some glue nozzles that are very dirty. We were wondering if there > was a different way of cleaning them besides sending them out (called a > couple of vendors but they would not quote site unseen) or spending money > for a kit that may not work. Any input would be greatly appreciated. > > > Thanks, > > Rob Day > > -------------------------------------------------------------------------- > ------- > 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 ---------------------------------------------------------------------------------