Electronics Forum | Fri May 02 12:41:16 EDT 2003 | Chris Lampron
Hi Chris, I had worked for a flex circuit house for 10 years. You should be able to follow your solder paste guidelines for times and temps. You may want to consider pre-baking the flex if it is made with Kapton. Kapton is Hygroscopic and will delam
Electronics Forum | Fri May 02 16:58:39 EDT 2003 | swagner
We have been building with flex circuits for nearly three years now, its an automotive product utilizing lead free paste, I will give you a few pointers. 1. Evaluate your supplier carefully, make sure you have some kind of stretch tolerance on the p
Electronics Forum | Fri Sep 10 18:17:21 EDT 2004 | jsloot
This is all very interesting. One obsticle I have to live with is I have an adhesive backing applied to the flex circuit before being placed on the pallet. Once gone through the reflow process the flex board goes through a couple of assembly stages a
Electronics Forum | Thu Apr 13 13:02:03 EDT 2000 | Paul Peterson
Hi fellow problem solvers,... We suspect a planarity problem with our 6 mil wide flex circuit pads having height variance of up to 2 mils after print and reflow. This is contributing to a placement skew with our TAB bonder... Has anyone had any succe
Electronics Forum | Thu Feb 15 08:34:50 EST 2007 | rgduval
Jim, In a previous life, we built some flex circuits for a customer. The configuration was a flex cable, with a circuit at one end of it. We had fixtures made out of the same material that we had selective wave solder fixtures made from. Cut an i
Electronics Forum | Fri Oct 01 13:09:18 EDT 2010 | clampron
Good Afternoon, How is the stiffener adheared? If it is laminated to the flex, it may help you with the surface planarity through reflow. If it put on with PSA, it may cause more problems then it would solve. PSA gets soft through the reflow. It may
Electronics Forum | Tue Jan 21 13:43:12 EST 2014 | rgduval
Jorge, Your description of the process sounds about right. A fixture to hold the flex cable taut (and in a repeatable location) that allows you to paste/place/reflow is essential. As for notes: Be hyper aware of moisture/humidity in regards to
Electronics Forum | Tue Oct 10 07:30:19 EDT 2017 | spoiltforchoice
TBH I think perhaps the OP deserved it, there is perfectly good explanation of Reflow and Process Window Index on Wikipedia for starters and if you want more all sorts of FREE specialist papers on things like reflowing flex circuit, lead/lead free et
Electronics Forum | Thu Nov 19 17:36:03 EST 1998 | Christopher Lampron
| Can someone please tell me where I might find detailed information on the processing of a double-sided flex circuitry design. I am looking for specifics such as methods of fixturing,printing,placing and reflowing.Things to keep in mind when process
Electronics Forum | Fri Oct 01 08:15:02 EDT 2010 | rgduval
Is the stiffener a piece of FR4, or a component that needs to be installed? We've done a number of flex assemblies taht have a rigid stiffener, generally a piece of rigid flex, or FR4 that has the components mounted on it. This type of stiffener
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