Buying the press for scaled flow is a wise idea.  There are many parameters involved in
making and controling prepreg.  Just checking two, one of which is subjective, is not
adequate.  Scaled flow testing will not always tell you what is wrong with the prepreg but
will let you know that the product itself has some factor that is out of spec.

Chuck Brummer
Acuson

Young Hwan Ju wrote:

> Dear all technetters
> I work for PWB manufacturing company which mainly produces multilayer
> board.
> When we inspect prepreg at the incoming material inspection, we just check
> resin content & gel time.
> Now, we have the plan to buy mini-press for the purpose of checking the
> scaled flow value of prepreg at the incoming inspection
> Our hot pressing process engineer insists that just checking resin content
> & gel time is not sufficient and ineffective to control the board
> thickness.
> I'd would like to know checking the scaled flow value at the incoming
> inspection is usual and effective way to control the board thickness.
> As long as I know, there are few of PWB manufacturing companies to check
> the scaled flow value at the incoming inspection.
> I have two questions.
>
> 1. To buy a mini-press is wise judgement for checking scaled flow value at
> the incoming inspection?
> 2. At the incoming inspection, checking resin content & gel time is
> actually not sufficient and ineffective? If so why?
>
> Any remarks will be helpful for me
>
> regards
> Jay Ju
>
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