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Date: Tue, 30 Jul 1996 22:27:53 -0700
From: JOHN GIBSON <[log in to unmask]>
Organization: J.A.G. IMAGING SYSTEMS
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To: John Gully <[log in to unmask]>
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Subject: Re: FAB: Resist Lamination
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John Gully wrote:
> 
> Address,
> 
> Has anyone identified the true benefits for using WET resist
> lamination over DRY (specific to the Dupont HRL-24 Hot Roll Laminator)?
> I am already familiar with most of the pros and cons of both.
> In working with our operators daily, we run WET lamination for
> inner layers and DRY lamination for external layers.  Seldom
> does the wall mounted pressure and/or water valves work for
> WET lamination for inner layers.  On several occasions I have
> found the WET method (hardware) to not work.
> 
> I pose this same question with our vendors on what they see
> at other shops they frequent.  WET is always the loser.
> 
> Since the exit temperature is critical to resist adhesion, I
> figure the wetting process would hinder the surface temperature
> from peaking.  Is this true?
> 
> If the nominal roller temperature is 120 degrees C what is the
> recommended surface exit temperature?
> 
> Please advise...
> 
> John Gulley
> 
> 
> 
>
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John 
 In response to your question on exit temps.
 I find the best results exit are achieved when the exit temp is warm
 to the touch.I know it does not sound very technical but I find it is 
the best way to laminate different types of thicknesses and materials.
Keep your roller temp consistent and adjust your roller speed to ensure 
that the exit temp of your material is warm.
material temp warm to cool ? slow down rollers
material hot?                 speed up rollers
-when I run for example .005 1/2 1/2 core material I use 2 people at a 
fairly fast roll speed 
-When I run a .093 backplane my roller speed is very slow easy for one 
operator 
Hope it helps 
John Gibson J.A.G. Imaging Systems

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======== Fwd by: Tony King / N ========
I strongly disagree with the response to change roller speed to acccommdate
exit temperature. Exit temperature is a very critical attribute on dry film
lamination regarless wet or dry application.  I believe equally if not more
important is the roll temperature / contact time relationship.  Film does
react to heat, by slowing down the roll temperature to impart more heat into
the thicker panels, the heat must transfer through the film, the film
therefore is subjected to more heat. Film subjected to more heat reacts
differently in subsequent processing and processes.  The better solution to
the problem is to maintain constant roll temperature and conveyor speed
(contact time), and control exit temperature of the product using a
preheater. This will insure uniform film performance regardless of product
thickness.

John, in response to your question of wet or dry lamination, I agree that
wet is the loser.  It was a great idea, however too much variation in the
process / product / equipment application causes inconsistent quality
results.  Conformance of the film to the product is excellent, however the
problems greatly out weigh the benefits. (lock-in, copper spots, product
hold times, etch variations etc)

Tony King
Elexsys International Inc.
Nashua N.H.
603-886-0066

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