Electronics Forum | Sat Jul 03 10:03:22 EDT 2004 | Bryan Sherh
Things to consider are: * Thermal expansion > characteristics of you flex and your pallet > should be better matched. We use G-10. * > Placement of your two sided tape should be > better, more uniformly distributed. We run strips > the length o
Electronics Forum | Wed May 24 16:47:22 EDT 2000 | Chris McDonald
I have found that if you have a custom carrier with support between pcbs on both SMT reflows (If you palletize) it will eliminate warping. Also Prebaking PCBS with wieght on the top of them helps too. Also look at the cooldown of your oven profile, y
Electronics Forum | Sun Jun 10 12:30:10 EDT 2001 | procon
Is this a Convection Oven or IR? If convection, you can increase the air velocity in the zones if the oven has this ability. You should do as Dave has explained. If you must use pallets when reflowing your components, you need to profile in the same
Electronics Forum | Wed May 16 15:40:56 EDT 2012 | davef
Here's some notes from a Bob Willis presentation Assembly of Flexible Circuits with Lead-Free Solder Alloy [Bob Willis leadfreesoldering.com] * Flexible Circuit Construction ** Base Material - 0.05mm Copper 18/18 um ESPANEX from Holders Technologies
Electronics Forum | Sat Dec 05 09:17:24 EST 2009 | nagesh
Solder paste & reflow the Bottom side.Use wave solder pallet to isolate the soldered components.
Electronics Forum | Mon Jun 18 21:21:25 EDT 2001 | davef
Two things: 1 A flat surface will probably help the "balls on the socket sliding off the ridge of HASL" problem, but possibly consider less risky choices for your flat surfaces that immersion silver, like: OSP, ENIG, and immersion tin. 2 Don�t throw-
Electronics Forum | Tue Jan 30 21:13:26 EST 2001 | davef
Two options: 1 Glue 2 Use a dedicated work holder with 'pockets' milled out to accommodate the components on the first side of the board after reflow. Some prefer a pallet that runs all the way through their process. So, these pallets: * Feature
Electronics Forum | Fri Dec 01 01:42:09 EST 2000 | PeteC
I recommend paste print-reflow the bottom side then use a selective wave solder pallet to mask the SMT components on the bottom side. PeteC
Electronics Forum | Tue Feb 09 12:30:37 EST 2021 | jzeivel
I am quoting a new job and am wondering if I should use carrier pallets for it. There are 2 PCBAs both are 31mil thick. One is about 16 inches long, and the other about 13 inches long. Both are 1.4 inches wide. I was thinking to put them in a 2 u
Electronics Forum | Fri Jun 21 16:41:10 EDT 2002 | pjc
If your wave machine has the new style Rotary Chip Wave and the Hot Air De-Bridging Knife options you can expect good yields. However, depending on the PCB design, double-sided solderpaste reflow and selective solder pallets for wave solder is a bett
