Solder paste ProFlow issueHave you thought about an ecu for your DEK? That
way you can control the temperature inside the printer to keep it with in
the optimal operating temperatures you have defined.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Henry Rekers
Sent: Friday, September 27, 2002 8:59 AM
To: [log in to unmask]
Subject: Re: [TN] Solder paste ProFlow issue
That helps to a point. (about 25 deg C) After that, I can't reduce the
pressure enough. On the flip side, when it is cool - 20 deg C, I can't
increase the pressure enough - the paste it too hard.
-----Original Message-----
From: Higgins Leo [mailto:[log in to unmask]]
Sent: Thursday, September 26, 2002 11:34 PM
To: [log in to unmask]; [log in to unmask]
Subject: Solder paste ProFlow issue
Does the problem reduce if you print with less shear stress (reduced
pressure, lower head speed) on the DEK? Shear-thinning in the paste could
add to the lower viscosity problems caused by elevated temperature.
Leo
-----Original Message-----
From: Henry Rekers [mailto:[log in to unmask]]
Sent: Wednesday, September 25, 2002 9:14 PM
Subject: Re: Viscosity vs Temperature.
Yes you can, our machine came with a proflow and sqeegee head. You
just have to power cycle the machine to go from one to the other. (Plus
change heads - a couple of bolts and a few connectors.)
-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, September 25, 2002 5:02 PM
To: [log in to unmask]
Subject: Re: [TN] Viscosity vs Temperature.
Hi Henry!
I don't have any answers to your dilema, but your post does bring up
some questions...
Once you have ProFlow installed on the printer, can you go to
regular squeegees if you need to? I know I could call DEK and find that out,
but I like to hear from us guys...
I have a DEK-288, and I can get it retro-fitted with ProFlow, but I
wonder if things go haywire, can I go back to analog=squeegees.
This is something that I've thought about with my new wave
solder...I've got an Electrovert Electra...everything is computer
controlled...so if my computer crashes on the machine (It's Windows NT,
makes me feel a little better...) I'm basically DIW...sorry, Navy term (Dead
In the Water).
-Steve Gregory-
We are having some issues with a new solder paste. The evaluations
came out
extremely well at first. However, upon using it for some trial
runs, we run
into some problems.
In our DEK profolw the prints look very good at about 20 deg C.
Throughout
the day, the temp in our facility climbs to 28 or even 30 deg C.
The prints
then start to bridge and flux bleeds out onto the board. We can
compensate
for it to about 25 deg by reducing the proflow pressure and wiping
on every
print, but beyond 25 deg, nothing helps.
By the time the 3rd shift rolls in, the temperature starts to drop
again and
the prints become more managable again.
Here's the kicker, we use this same paste on our MPM with
squeegee's and the
print works every time. There is never a print problem vs
temperature.
Has anybody ever run into this situation? How did you solve it?
Thanks in advance.
Henry J. Rekers
Manufacturing Engineer
Power Measurement.
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