======== Original Message ======== Sender: [log in to unmask] Received: from simon.ipc.org (IPC.ORG [168.113.24.64]) by dub-img-5.compuserve.com (8.6.10/5.950515) id WAA27585; Tue, 30 Jul 1996 22:45:36 -0400 Received: from ipc.org by simon.ipc.org via SMTP (940816.SGI.8.6.9/940406.SGI) id VAA04408; Tue, 30 Jul 1996 21:42:18 -0700 Resent-Date: Tue, 30 Jul 1996 21:42:18 -0700 Received: by ipc.org (Smail3.1.28.1 #2) id m0ulQtZ-0000KoC; Tue, 30 Jul 96 21:20 CDT Resent-Sender: [log in to unmask] Old-Return-Path: <[log in to unmask]> Message-ID: <[log in to unmask]> Date: Tue, 30 Jul 1996 22:27:53 -0700 From: JOHN GIBSON <[log in to unmask]> Organization: J.A.G. IMAGING SYSTEMS X-Mailer: Mozilla 2.01 (Win95; U) MIME-Version: 1.0 To: John Gully <[log in to unmask]> CC: Technet <[log in to unmask]> Subject: Re: FAB: Resist Lamination References: <[log in to unmask]> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Resent-Message-ID: <"U3LSG1.0.qXC.ZBi_n"@ipc> Resent-From: [log in to unmask] X-Mailing-List: <[log in to unmask]> archive/latest/5453 X-Loop: [log in to unmask] Precedence: list Resent-Sender: [log in to unmask] 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 > > > > *************************************************************************** > * TechNet mail list is provided as a service by IPC using SmartList v3.05 * > *************************************************************************** > * To unsubscribe from this list at any time, send a message to: * > * [log in to unmask] with <subject: unsubscribe> and no text. * > *************************************************************************** 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 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** ======== 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 *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************