Dear Paul,
Nice to hear from you again. Before, we try to do something with
syringe having air bubblesor gaps. If gap is near the tip, we squeeze
out paste to remove. If it's in the middle , we tap the syringe
against the table. This procedure is not fool proof. But today and
due to the criticality of 0402, we are returning syringe with air
gaps.
Rgds.,
Edwin
______________________________ Reply Separator _________________________________
Subject: RE: [TN] Getting rid of Air Bubbles in Solder Paste Syringes
Author: Paul Klasek <[log in to unmask]> at #SMTP
Date: 20/05/1998 01:56 PM
Hi Matthias
I am surprised you put up with the bubbles .
We return them as non conforming to specs., and that is the end of it .
With copy of A black mark in black book on top of it .
As you guessed correctly, without vacuum you can do very little ;
even than the bubbles can push the paste out of syringe ;
you really do not want to get into desperate modes like this .
Your syringes are capped on point with a pin pushing into exit ?
If they have just a screw on cap as most do ( standard EFD tip caps ) ,
that is one way to get the air in .
No fun to bubble on o805's , agree .
Sorry ; no tricks .
I'll forward you contact on Ed Salido ; Philips ; Manila ;
he may know better , doing o402's .
See you paul ; ResMed
>----------
>From: Matthias Mansfeld[SMTP:[log in to unmask]]
>Sent: Wednesday, 20 May 1998 8:19
>To: [log in to unmask]
>Subject: [TN] Getting rid of Air Bubbles in Solder Paste Syringes
>
>Hello Technetters,
>
>I have some solder paste syringes which contain air bubble, probably
>from transport. That means, I have to fight with a bit of overflow
>during dispensing, rather boring with 0805 or SOICs. Pull back flow
>is not so easy to set up with my equipment, thus, the best would be
>to get rid of these bubbles.
>Does anybody know an easy, proven trick? ( I have no vacuum chamber
>available).
>
>Many thanx in advance, regards
>Matthias Mansfeld
>-----------------------------------------------
>Matthias Mansfeld Elektronik
>* Printed Circuit Board Design and Assembly
>Am Langhoelzl 11, D-85540 Haar, GERMANY
>Phone: +49-89-4620 0937, Fax: +49-89-4620 0938
>E-Mail: [log in to unmask]
>Internet: http://home.t-online.de/home/matthias.mansfeld
>
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