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September 1999

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Subject:
From:
Chuck Brummer <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 1 Sep 1999 07:52:57 -0700
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Let us count the ways, sorry just a little joke.  In my last bit of advice I suggested
that the problem could be fixed by increasing the resin to glass ratio.  But too much
resin not enough glass can make your package slip.  When was the last time you checked
your press for parallelism?  You might be pushing the package to one side or corner.
If your gel time is off the prepreg can get very slippery.  How many layers?  Are your
making a multilayer that has little "C" stage core and very much prepreg.  Do you need
to block the load.  When we last used vacuum assisted lamination I made some aluminum
frames to assure the load was centered and resisted slippage because we use some
conformals that can cause slippage when the stack was higher.  When we do not use the
vacuum assist we reduce the stack height.

Dan Brandler, where are you?  You should probably have some insight for this guy.

Chuck Brummer
[log in to unmask]

Wang, William (Suzhou Laminate) wrote:

>     I'm a greenhand of copper clad laminate, can anyone tell me why
> copper clad laminate could slip during press and how to prevent from
> slippage? (We use vacuum assisted hydraulic press)
>
> Thanks and best regards
> William Wang
>
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