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Dear Chuck
Thank you for your sincere advice.
Regarding prepreg I also know there are several properties such as R/F,
S/F, G/T, R/C, V/C.
Actually most of our prepreg suppliers provide above data through the
inspection report whenever they send materials to us.
The thing that I really would like to know is what property is the most
influential in controlling board thickness when we make multilayer board
among R/C, S/F, R/F or other thing?
And I think after buying mini-press, checking scaled flow value at the
incoming inspection is the labor loss.
If you work for PWB manufacturing company, Does your company also check the
scaled flow value at the incoming inspection?
If so or not , please tell me the reason.
Regards
Jay Ju
Chuck Brummer <v=E@N : [log in to unmask]
<cbrummer@ACUS B|A6@N :
ON.COM> A&8q : Re: [TN] Checking scaled flow value of prepreg at the
9_=E@N : incominginspection.
TechNet
<[log in to unmask]
RG>
2001-07-11
11:48 PM
"TechNet
E-Mail Forum."
?!0T H8=EGO?)
AV=J=C?@ .;
Chuck Brummer
?!0T H8=EGO?)
AV=J=C?@ .
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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