Jay,
        Do you trust your supplier?  They should be providing data to
include the two tests you are doing and either resin flow or scaled flow.
Is your check just confirmation of incoming quality?
        I've heard many times that there is not good correlation from scaled
flow to pressed thickness, but rather just a good indicator of the
performance.  Now, if you had it in storage for some three months or so, it
may be good to verify its condition before use.

Glenn

-----Original Message-----
From: Young Hwan Ju [mailto:[log in to unmask]]
Sent: Wednesday, July 11, 2001 1:45 AM
To: [log in to unmask]
Subject: [TN] Checking scaled flow value of prepreg at the incoming
inspection.


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

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------