Direct from the manufacturer...
Steve
-----Original Message-----
From: Joyce Koo
Sent: Wednesday, February 22, 2012 8:50 PM
To: [log in to unmask]
Subject: Re: [TN] Air Bubbles in Syringes of Solder Paste...
Did you get directly from mfg or ask distributor to re package it for you?
--------------------------
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----- Original Message -----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, February 22, 2012 07:58 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Air Bubbles in Syringes of Solder Paste...
I meant to say 35-gram syringes...
Steve
From: Steve Gregory
Sent: Wednesday, February 22, 2012 7:51 PM
To: [log in to unmask]
Subject: [TN] Air Bubbles in Syringes of Solder Paste...
Hi All,
I have a question about syringes of dispensable solder paste. We purchase
10cc syringes of Type-4 dispensable solder paste for work that we do. It’s
used much of the time to dispense paste for the stacked capacitors that we
do, much of the time it’s for 0402 caps, so the dispensing has to be very
precise.
Recently our operators have complained about the paste, they said they’re
having a hard time being consistent with the dots they’re trying to
dispense. One of the operators showed me the syringe that she was using, and
I was surprised at the air bubbles I saw inside the syringe. The photos
below are pictures I took under a microscope through the side of the
syringe:
http://stevezeva.homestead.com/AirBubbles.jpg
http://stevezeva.homestead.com/AirBubblesClose.jpg
I can see why she was having trouble. As I said, we buy these syringes
pre-filled, they come to us packaged in a cool pack, and we store them
immediately in the refrigerator until they are ready to be used. They are
taken out and allowed to come up to room temperature before they are ever
attached to a dispenser. We use EFD dispensers BTW.
I looked at the syringes that were un-touched and stored in the
refrigerator, and they had the same sort of bubbles. So our dispensers are
not introducing them, and it seemed like the bubbles were only associated
with one lot of of syringes. There was another lot in the refrigerator that
did not have the bubbles.
So my question is (not being a solder paste vendor), how are these syringes
filled ? Do they centrifuge them to eliminate the bubbles ? I know I did
that in the past when I filled syringes with chip bonder for our Fuji
dispenser, in fact, the centrifuge was sold to us by Fuji. But I’m not sure
about solder paste. How do you go about making sure there are no bubbles in
syringes of solder paste ? Is there anything we can do with the paste that
we have to eliminate the bubbles or should we just send the paste back ?
Steve
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