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April 2008

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TechNet E-Mail Forum <[log in to unmask]>, Inge <[log in to unmask]>
Date:
Tue, 15 Apr 2008 22:01:27 -0700
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Use a flat rubber band. Just to stretch the band, put the board under it and 
let the band go back, pressing the board against basket. You have to
replace the rubber band frequently, depending on what cleaning agent you
use. We also have baskets with a simple cover, that locks the board.
Inge


----- Original Message -----
From: "Ken Bloomquist" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 16, 2008 8:05 AM
Subject: Re: [TN] Defects related to water wash


> Hi Everybody,
>
> I've been away from the TechNet for a while but it's good to be back. I'm
> now working for a wonderful EMS on beautiful Whidbey Island, Washington.
>
> Carl, you hit on a subject that we are addressing right now. We use metal
> wire mesh baskets to transport assemblies through our wash. We experience
> damaged SMT parts from time to time such as chipped caps or missing parts.
> We believe that it is from the water pressure and air pressure bouncing
> the
> boards around and banging them into the wire mesh.
>
> We are evaluating several different ideas but haven't found the best fix
> yet. I'll be interested to hear if other TechNetters have this problem and
> if so how they've solved it.
>
> Best regards,
>
> KennyB
>
> -----Original Message-----
> From: Ray, Carl (GE EntSol, Intelligent Platforms)
> [mailto:[log in to unmask]]
> Sent: Wednesday, April 16, 2008 7:48 AM
> To: [log in to unmask]
> Subject: [TN] Defects related to water wash
>
> Does anyone out there have any information or data related to defect
> rates for components after water wash processes? Some obvious components
> such as switches, speakers and similar devices that are exposed to the
> wash is a given to expect failures. The concern we have is with other
> types of components.
>
>
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