Chuck,

Interesting...............who makes the Differential Pressure Laminator?

Martin

===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
28/09/00 16:28
>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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