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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 12 Jul 1999 12:42:19 +0100 |
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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 115ºC. 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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