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April 2008

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Subject:
From:
Charlie Pitarys <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Charlie Pitarys <[log in to unmask]>
Date:
Fri, 18 Apr 2008 09:49:17 -0500
Content-Type:
text/plain
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text/plain (113 lines)
Kenny, (assuming you have an in-line washer) it is important to set the
spray manifold pressure with at least 10psi higher on the top even when
washing in a basket. You want the pressure to pin it to the belt.
If you have long edge connectors on the board run them with the connector
parallel to the conveyor. This will eleiminate flipping and will help dry
them better.

Also many times the damage will happen only in the dryer section. Insure the
first air knife pins the board down. I have always had best results when the
top dryer manifolds impinge directly vertical.

If all else fails, simple office binder clips work well too!


Best regards,
Charlie

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Wednesday, April 16, 2008 12:01 AM
To: [log in to unmask]
Subject: Re: [TN] Defects related to water wash

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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