without knowing the details, Joseph Fjelstad's book "flexible circuit  
technology" might be a good guide.
best of luck.
jk
On Jan 22, 2020, at 2:36 PM, Decker, Scott Collins wrote:

> Victor,
>    OK, I'll take a stab at it since all you go so far is  
> ZZZZZZZZZZ's :-/  Since I didn't find anything in the documentation  
> I had access to that would cover this, my guess is what the master  
> drawing states and if that isn't covered on the drawing, the vendor  
> should have data for this issue. It sounds like the amount depends  
> on the squeeze out of the resin in the rigid flex interface area.  
> The fact that it's not even may be due to the copper in the area  
> which may make it unpredictable to some degree. It's interesting  
> that there was no simi-rigid strain relief at the interface since  
> that squeeze out creates that knife edge issue and can cut the  
> cover layer, etc. I know this isn't the best answer and may not in  
> fact BE an answer, but it is a slightly educated guess at best and  
> not ZZZZ's. :-)
>    On a similar note, a few years ago I had a rigid-flex design  
> that the manufacture had routinely put the strain relief on the  
> edge even though I didn't have it called out on the drawing. I  
> figured it was standard practice. WRONG! We had sent the design to  
> another vendor and when we got them back they didn't have the  
> interface area covered. When I questioned them on it they just  
> said, "it wasn't on the drawing so we didn't do it". Note to self,  
> put it on the drawing if you want it there no matter how nice one  
> vendor is, there is always another that doesn't see it that way...  
> Oh and speaking of seeing it, there was another process to get  
> pictures posted to here but I don't recall who was doing it,  
> perhaps they will chime in on that now also?
>
> Scott Decker | Senior Engineer, PCB Design Services CID+ |  
> Electronic Systems Center
> COLLINS AEROSPACE
> 3445 S. 5th Street, Suite 170, Phoenix, AZ 85040 U.S.A.
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of  
> [log in to unmask]
> Sent: Wednesday, January 22, 2020 11:14 AM
> To: [log in to unmask]
> Subject: [External] [TN] FW: IPC-2223D, Sectional Design Standard  
> for Flexible/Rigid-Flexible Printed Board
>
> Fellow Tech Netters,
>
>     Perhaps it was too early in the morning for Rigid Flex PWBs  
> questions.
> Therefore, I post the second time in hope that everyone is awake.
>
> I send some pics to Steve Gregory mail box.
>
> Victor,
>
> From: Hernandez, Victor G <[log in to unmask]>
> Sent: Wednesday, January 22, 2020 6:01 AM
> To: TechNet E-Mail Forum
> Cc: Hernandez, Victor G
> Subject: IPC-2223D, Sectional Design Standard for Flexible/Rigid- 
> Flexible Printed Board
>
> Fellow Tech Netters,
>
>    I would like a clarification on the above stated standard.
> Post Router Process:
>
>   *   How much PWB laminate material flashing is allowable exiting  
> the rigid flex construction.
>   *   One side measures 5 mils and the other 25 mils.
>   *   No Strain Relief Fillet material utilized.
>
> Where can I upload pics?
>
> Victor,