Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Flex Circuit

#6717

Flex Circuit | 29 May, 2001

OK, I have a new product being tossed over "the wall" that has a flex circuit layered into a standard FR board and protrudes out of it. The flex circuit is 0.022" thick and is the 3rd layer of 6 layers. The total board thickness of the FR board is 0.082" thick. I have to populate both the FR board and flex circuit all at the same time. Not too bad, but there is a 0.030" drop in height between the FR board and flex circuit. I'm pretty sure I can over come the Z height and populate this thing, but how do I keep it held down? Sure big ol' clamps in a pallet are fine for placement, but what about that little screen printing process before the placement? Do I need to even clamp a flex circuit down for screen printing? Anyone doing this? Any help is greatly appreciated.

The standard "read the archives, slap nutz" is not the answer sought.

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Travis Slaughter

#6724

Flex Circuit | 30 May, 2001

Do you have vacuum on your printer? I guess not or you wouldn�t be asking. Can you get vacuum? If not you could use double sided tape, I am always amazed how many times it can stick before it needs replaced.

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#6725

Flex Circuit | 30 May, 2001

Why yes, I do have vacuum on my printer (God bless MPM!). I see what you're saying - use a pallet and have vacuum holes to hold the flex circuiut! Wow, it just got a little brighter in my cube! Oh, the light bulb above my head just went on. Thanks for the idea Traviss!

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Jesse Katzman

#6727

Flex Circuit | 30 May, 2001

Thanks for being my guinea pig, hussman. I'm the director of publications for the SMTA, and we're testing the distributed forums content technology developed by SMTnet. I'm sorry I have no answer for your technical question, but I'm curious, what do you mean by "slap nutz".

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#6729

Flex Circuit | 30 May, 2001

Slappy,

Most of our discussions about flex came before the last great SMTnet.com server transition that destroyed the archives.

Consider custom building carriers with tooling holes, vacuum line holes, alignment pins, multiple layers, etc. from unclad laminate purchased from your local PCB fab. The double-side that Travis mentions works great.

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#6730

Flex Circuit | 30 May, 2001

Why, it's how one dummy calls another dummy stupid.

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