Which is a good practice anyway. You should never mix paste that has
been sheared on the printer or exposed back in with good paste, as their
rheologies are now completely different. Dispense only enough to print a
few assemblies at a time and properly discard the remainder when
finished.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bev Christian
Sent: Thursday, November 10, 2005 2:48 PM
To: [log in to unmask]
Subject: Re: [TN] Solder paste control
Yannick,
Jeff is right. AND if you have a rule that anything left at the end of
the shift/day (depending on what the supplier provides) on the stencil
is tossed, then you should be able to convince your ISO guy.
Bev
RIM
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeffrey Bush
Sent: November 10, 2005 3:35 PM
To: [log in to unmask]
Subject: Re: [TN] Solder paste control
You supplier should be able to give you both the shelf and pot life of
the paste.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Yannick Brisson
Sent: Thursday, November 10, 2005 2:57 PM
To: [log in to unmask]
Subject: [TN] Solder paste control
Hi,
I had a question from our ISO guy asking me how I know that the
paste we use is in good condition? The problem is that he saw our
operator put some old paste back in a empty jar to reuse it the next
day. So his question is how do you know the paste has been on the
stencil below the maximal hour wrote in the datasheet? Do you know any
measure than I can take to certify that the paste in good? like
viscosity or something else? And how I do that? Because I'm pretty sure
that is next question will be how I know the new paste we just receive
is good too.
Thank You
Yannick
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