Dear Sirs ,
 I am a Process Eng. of one polyimide tape circuit substrate for TAB.
Now I have met a serious problem that is How to prevent the short
circuit after wet etching ( with ferric chloride) 6 um copper on the
polyimide tape circuit !
If every one has any good suggestion ,please E-mail to me !! Thanks!!
My E-mail address  : www.jayy@kimo.com.tw