Hi,

Back in the days when we used an HRL for single sided resist lamination we ran the
lower roll at 100F to keep the resist from sticking to the lower roll between panels.
Still had good resist adhesion as long as the exit temperature of the panel was at
least 145F.  The upper roll was set at 235F.

We used to do it very unsafely.  All the guards off and the operators with their
fingers very close to the pinch keeping light tension on the edges of the flex, half
mil Kapton with half ounce copper.

Now we use the Differential Pressure Laminator, (vacuum laminator).

Good Luck

Chuck Brummer

Martin Christie wrote:

> Hans,
>
> Do you still get good adhesion of the resist using the FR4? My only concern
> would be that the FR4 would tend to insulate the flex from the bottom heated
> roller. It may look okay but may manifest itself as poor line definition
> when you come to develop / etch.
>
> I've used a material called "Duofoil" in the past as a rigidiser for very
> thin flex (can't remember who makes it). Basically it's just a thin Al sheet
> (normally used in stack make-ups for laminating flex circuits).
>
> Martin
>
> ===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
> 27/09/00 16:18
> >Martin and Bareboard,
> >
> >Thanks for the replies.
> >
> >We taped the flex to some 31 mil FR-4, ran it through the laminator and it
> >worked!
> >
> >Now, I'll order some pressure sensitive film for the next time.
> >
> >Hans
> >
> >
> >-----Original Message-----
> >From: [log in to unmask] [mailto:[log in to unmask]]
> >Sent: Tuesday, September 26, 2000 2:33 PM
> >To: [log in to unmask]; [log in to unmask]
> >Subject: Re: [TN] Flex Wrinkling during Hot Roll Photo Resist Lamination
> >
> >
> >A pressure variation from one end of the roller to the other would be my
> >guess.
> >Just had the same problem. Found one of the idler gears in the machine had
> >spit out a key and was slightly out of alignment, which was causing the
> >roller to apply uneven pressure across the panel.
> >
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