Mr. Varon,
Two suggestions:
1. Look at the developer pH and concentration when devloping the lot.
You said that the problem comes and goes.
2. Also, make sure that you are not printing hot panels from the
laminator. The heat from the panels can cause a false and inconsistent
step wedge.
Hope this helps you.
Regards,
Will Miller
Process Engineer, Glen Cove Mask Operations
Photocircuits Corp.
31 Sea Cliff Ave. Phone: (516) 609-1148
Glen Cove, NY 11542 Fax: (516) 609-1273
E-mail: [log in to unmask]
On Monday, July 12, 1999 5:22 AM, CIPSA
[SMTP:[log in to unmask]] 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
> **********************************************************
>
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