Scott, This all sounds good enough to write a conference paper on! Bev RIM -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Post, Scott E Sent: Wednesday, July 21, 2010 11:17 AM To: [log in to unmask] Subject: Re: [TN] Baking in tape & reel Good point on the hole in the bottom of the pocket, Bev. What I may do is bake at 30C in vacuum and pull a sample every few days and run thermoire. I'll quit baking when the parts remain flat during reflow. I called the place that I had do the tape & reel and they weren't sure how the cover tape glue would react to the heat. They were also concerned about the plastic reel warping, but that doesn't concern me since it would be easy to restring them on a new hub by hand. Scott Post P.O.U. 0000-001E-0CTC 2151 E. Lincoln Road Kokomo, Indiana 46904-9005 765-451-2983 (Phone) 765-451-0287 (FAX) -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian Sent: Wednesday, July 21, 2010 10:26 AM To: [log in to unmask] Subject: Re: [TN] Baking in tape & reel Scott, Some reels manufacturers are OK with 40C bake, others are not. Same for the component manufacturers that use reels. Many reel pockets have a hole in the bottom, so vacuum not an issue. I would not expect the others to be hermetic either. However, vacuum MIGHT remove adhesive solvent and change peel. There are other potential problems with vacuum that have been discussed on TechNet. 30C? Hmm. Would have to plot it, but you might be looking at an exponential increase in required drying time. Bev RIM ----- Original Message ----- From: Post, Scott E [mailto:[log in to unmask]] Sent: Wednesday, July 21, 2010 10:12 AM To: [log in to unmask] <[log in to unmask]> Subject: [TN] Baking in tape & reel I have some BGAs (not active - just daisy chained with dummy die) in tape & reel that I need to bake. I know I could remove them and put them in trays for baking, but for various reasons I'd like to avoid this. Based on the component thickness, JEDEC recommends 13 days at 40C. My main concern is that heat will effect the glue on the cover tape and make the reel a pain to use on an SMT feeder. I have an oven that has a nitrogen feed and a vacuum pump, so either inerting or vacuum is an option. Has anyone played with using lower temps (30C?) but either inerting or pulling a vacuum? I'm concerned that a vacuum may collapse the cover tape into the pockets and pull the glue loose. I don't necessarily need to reset the moisture clock to 0 either - I just need to reduce the warpage. These are 0.4 mm pitch and I'm getting shorting in the corners. I ran Thermoire on samples before and after a 125C overnight bake and the unbaked samples turned into potato chips above 200C. The corners are warping 200 microns towards the board. The baked samples stay flat during reflow. I'm re-introducing moisture to the baked samples and I'll run Thermoire again to make sure moisture caused the warpage rather than some uncured material that I cured during the 125C bake. Scott Post P.O.U. 0000-001E-0CTC 2151 E. Lincoln Road Kokomo, Indiana 46904-9005 765-451-2983 (Phone) 765-451-0287 (FAX) ************************************************************************ **************** Note: If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. 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