TECHNET Archives

October 2012

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Robert Kondner <[log in to unmask]>
Reply To:
Date:
Mon, 15 Oct 2012 14:38:01 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (136 lines)
Steve,

 Interesting. Pressure at 35000 is about 1/3 that of 11000. So I would
suspect a lot of bags to pop. And an IC bag is longer and thinner than a
potato chip bag.  I long thin bag could place tremendous forces on the
seams. 

 I was only thinking about leaks. Now you make me think about tearing bags.

 Aircraft are pressurized to the 8000 ft level. See:
http://en.wikipedia.org/wiki/File:Empty_bottle_crushed_by_cabin_pressurizati
on.jpg

 Assume that bottle was a bag with a PCB inside!

Still might not be a serious problem, just something I never thought of
before.

Bob K. 



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Smith
Sent: Monday, October 15, 2012 2:01 PM
To: [log in to unmask]
Subject: Re: [TN] Air Pressures Changes During Overnight Shipping

Once when I was on vacation traveling in Colorado I was about to go into the
Eisenhower tunnel on I-70 which is about 11,000 feet in altitude when I
heard this sharp bang.  I grabbed the steering wheel tight thinking that I
had just blown a tire.  But after a few seconds I realized that the van was
fine.  Then one of my sons in the back of the van said "Hey dad, was that
bag of Doritos open?". 

My regards,
Steve Smith
Project Engineer
Staco Energy Products Co.
"Your tailored power solutions provider"



DISCLAIMER AND/OR CONFIDENTIALITY NOTICE:
This message, including any attached materials, is intended solely for the
use of the individual or entity to whom it is addressed and may contain
information that is privileged, confidential, and exempt from disclosure
under applicable law. If the reader of this electronic mail transmission is
not the intended recipient, you are hereby notified that any dissemination,
distribution, or copying of this communication is strictly prohibited. If
you have received this communication in error, please e-mail or call Staco
Energy Products Co. at (937) 253-1191. Thank you for your cooperation.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Monday, October 15, 2012 1:42 PM
To: [log in to unmask]
Subject: Re: [TN] Air Pressures Changes During Overnight Shipping

If your package as good as a bag of potato chips, no problem. If your
package can not withstand cabinet pressure change, something is wrong with
your package. We are not talking about rapid decompression as in case of
bullet holes. (In that case, you got other more important stuff to worry
about than potato chips:-)
--------------------------
Sent using BlackBerry


----- Original Message -----
From: Robert Kondner [mailto:[log in to unmask]]
Sent: Monday, October 15, 2012 01:30 PM
To: [log in to unmask] <[log in to unmask]>
Subject: [TN] Air Pressures Changes During Overnight Shipping

Hi,

 

I was wondering if anyone knows about changes in air pressure as experienced
by overnight shipping of components.

 

High altitude air is fairly dry but a leaking package would re-inflate
somewhat on landing sucking in ground level air.

 

This all might amount to a pile of hogwash but I was curious if it had ever
been explored.

 

Bob K.



______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________

---------------------------------------------------------------------
This transmission (including any attachments) may contain confidential
information, privileged material (including material protected by the
solicitor-client or other applicable privileges), or constitute non-public
information. Any use of this information by anyone other than the intended
recipient is prohibited. If you have received this transmission in error,
please immediately reply to the sender and delete this information from your
system. Use, dissemination, distribution, or reproduction of this
transmission by unintended recipients is not authorized and may be unlawful.

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2