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July 1999

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Subject:
From:
Andrew McGlasson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 12 Jul 1999 12:42:19 +0100
Content-Type:
text/plain
Parts/Attachments:
text/plain (71 lines)
Have a look at the temperature / strength and times on the cleaner you are
using prior to electrolytic copper.
Cleaners can attack the resist. By increasing the time or temperature you
should be able to make it happen.

Hope this helps.

Andrew McGlasson
Comelim Circuits Ltd




-----Original Message-----
From: Albert Mok [mailto:[log in to unmask]]
Sent: 12 July 1999 11:45
To: [log in to unmask]
Subject: Re: [TN] RV: Dry film adherence problems


Dear Mr. Varon,

My first impression seems to me you already concluded the problem to be the
dry film adhersion problem.  I have to add that there are many other
possibilties that may make the line width "thicker".

1.  Poor lamination due to temperature/time/pressure(you have to check the
board surface temp.)
2.  Exposure time too short( What is the stouffer?)
3.  Developing chemical/spray pressure/time in excess

If it is really "underplated", it is high possible to be problem from point
1 and 3.  If it is not underplated, please check point 2.

Hope this help.

____________________________________________________________________________
____________



At 11:22 AM 1999/7/12 +0200, CIPSA wrote:
>
>  Dear Sirs,   The reason why we send this e-mail is because we are having
> problems of adherence of our dry film Dupont  4615. The problem always
>appears beside the track/pads, and in the  final pcb you always can see a
>bigger track, because the adherence of  the film has not good and some
>Sn/Pb has get on the base copper (the film  has not  protect correctly the
>base copper, beside the  track).   We have done the following corrective
>actions and there has  not been any success at all: 1. We have increased
>the lamination temperature from 105 to  115&ordm;C. The presion is about 4
>bars. The lamination rolls speed is  about 1,6-2 m/min. 2. We have checked
>the pH of the revelator solution and goes  from pH 11 at the beginnig to
>10,4 at the end of the solution  live. 3. We are quite sure that is not a
>electrolitic line problem,  because in the same bath position, we have
>panels with and without  problems. 4. We have checked all the insolation
>parameters  and everything is OK.   What we are doing now, is changing from
>Dupont  film 4615, to 215. Maybe, it will solve the  problem, but we don't
>know the cause of our problem.   Does anybody knows the cause of our
>problem  ???   Thank you in advance for your colaboration.   Albert Varon
>Quality  Manager.
>**********************************************************
>CIRCUITOS  IMPRESOS PROFESIONALES,S.A..
>Pol.Ind.Els Bellots C/de l'Aigua, 28
>08227  TERRASSA (Barcelona) SPAIN
>Apdo. de correos 597-598
>Telf. 34.937856793 Fax  34.937861905
>**********************************************************
>
Albert Mok

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