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March 2010

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Subject:
From:
Bob Landman <[log in to unmask]>
Reply To:
Bob Landman <[log in to unmask]>
Date:
Wed, 24 Mar 2010 10:08:39 -0400
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Wayne,

Here's Trek's URL http://www.trekinc.com/ They are in Medina NY (used to be in Buffalo).  I visited the company in January years ago (BRRRRR!!!!).

Very good equipment.  I encouraged them to develop their HV op amps for driving piezos.  The president of the company is a very talented EE (Bruce Williams) who knows more about electrostatics than anyone I've ever met.  I called him and he says so long as the humidity is above 50% there should not be a problem but if the environment is dry then triboelectric generation of static in the air jet can be a problem, esp if the nozzles are plastic and not grounded metal.

A ESD field meter (hand held) can do the job of detecting the charge buildup. Blow air at a typical surface as you usually do then try to measure the accumulated charge by bringing the meter close to the surface (don't need the more expensive voltmeter).

Alternatively you might consider an instrument like this
http://www.trekinc.com/products/157.asp which you blow air onto directly and it measures the charge accumulated.

(I looked in my copy of ESD Program Managerment by Theo Dangelmayer (formerly with AT&T) but it doesn't mention anything about triboelectric generated static from an air nozzle.)

-Bob

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman
Sent: Wednesday, March 24, 2010 7:59 AM
To: [log in to unmask]
Subject: Re: [TN] air or nitrogen for drying

Contact Trek Inc in upstate NY as they make a variety of static voltmeters (3M and others rebrand their products).  Perhaps they will have advice for you on what can be done.

One suggestion, as I had the opposite problem years ago, doing consulting on a manufacturing line using Binks sprayers to spray adhesive on lids for 55 gal food barrels.  Automation then placed o- rings into the adhesive.

No adhesive then the next step placed the lids on the barrels and the o-rings would fall into the food.  Oops!

Problem was the sprayers clogged periodically.  So the company had a person watching the sprayers....

My solution was to charge the sprayer tips with 10v then use a Trek  
electrostatic voltmeter to measure the charge deposited on the lids.   
No charge, stop the line and clean the spray tips.

Watching job eliminated.

You have the reverse problem so I would suggest grounding the air jet tips  then measure with the Trek voltmeter.

Bob Landman

Sent from my iPhone

On Mar 23, 2010, at 5:50 PM, "Thayer, Wayne - IIW"  
<[log in to unmask]> wrote:

> We have a number of "airbrush" low pressure nozzles around here for 
> spraying solvents on reworked boards and for drying them off.  I know 
> that nozzles can create static, but I have had no problems to date and 
> have had no problem with dust sticking to the boards when I dry them 
> off this way.
>
> I haven't been able to find anything on trying to quantify static from 
> nozzles used in this way.  Does anyone have data?  Moving to ionized 
> blow-off for drying the boards would be painful, as that means yet 
> more equipment in our small cleaning stations.
>
> Wayne Thayer
>
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