Hey, the ant is still breathing and moving around, and I can still smell him, so there must still be oxygen in the chamber. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner Sent: Monday, April 15, 2013 11:41 AM To: [log in to unmask] Subject: Re: [TN] Pakeout and PCB Separators I guess find at least one oxygen atom? Hey - I see one over there, prove me wrong? Bob K. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahne Oosterhof Sent: Monday, April 15, 2013 12:27 PM To: [log in to unmask] Subject: Re: [TN] Pakeout and PCB Separators The next question is: how do you verify that you are successful? Ahne. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner Sent: 15 April, 2013 08:31 To: [log in to unmask] Subject: Re: [TN] Pakeout and PCB Separators Inge, Did you want a serious response or just a Causerie? :-) If you attempt to remove all the oxygen, every single atom, then only your success rate will hit ZERO. Actually, now that I think about it, bare metal in a vacuum chamber might just serve as a "Getter" like the coatings inside old vacuum tubes. So I do wonder how effective a vacuum chamber might be in reducing oxidation at elevated temperatures. It might help but I don't know. Bob -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord Sent: Sunday, April 14, 2013 2:43 PM To: [log in to unmask] Subject: Re: [TN] Pakeout and PCB Separators Oxidation...Oxygeg.question for Bob: Remember our little discussion on 'zero' . What I ask now has no practical application. I have had the thought before when I used ultrahigh vacuum (exp -12)..Now to question: Is it possible to remove all oxygen molecules in a volum made of xxxxx. I mean zero molecules, not one single molecule. Or is there a place in Universe where a Oxygen atom is unthinkable? Inge On 10 April 2013 16:54, Robert Kondner <[log in to unmask]> wrote: > I will agree about oxidation but not faster drying. I mean the vapor > pressure of water is already quite low at room temperature. I think > drying time for a material with absorbed vapor is fixed by diffusion > rates and distance. And temperature is a bit driver of diffusion rate. > Is air pressure even in the equation? > > Bob K. > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Reuven Rokah > Sent: Tuesday, April 09, 2013 2:12 PM > To: [log in to unmask] > Subject: Re: [TN] Pakeout and PCB Separators > > Baking in Vacuum oven = less pads oxidation and faster drying > > > On Tue, Apr 9, 2013 at 9:00 PM, Glidden, Kevin > <[log in to unmask]>wrote: > > > Someone in Technet not long ago posted up an excellent little write > > up from Gordon Davy about water vapor and drying. I've attached it > > to Phil and Bob. > > > > It contends vacuum ovens do nothing to increase drying rate. > > > > Drying is a function of temperature and delta between concentration > > of water in the middle versus at the surface. > > > > I presume, like any drying, the greater the surface area exposed the > > faster the drying. I would place the PCBs (as much as possible) > > directly on racks or in card holders (on edge). > > > > -----Original Message----- > > From: Nutting, Phil [mailto:[log in to unmask]] > > Sent: Tuesday, April 09, 2013 1:01 PM > > To: [log in to unmask] > > Subject: Re: [TN] Pakeout and PCB Separators > > > > Robert, > > > > How about placing them in a vacuum chamber. That would release all > > the moisture and definitely if you could add a little heat. I would > > envision separating the boards with a mesh and spacer to allow the > > moisture to fully escape. Placing a paper towel between layers > > might not let all the moisture escape. > > > > But then this is just my opinion. > > > > Phil Nutting > > > > -----Original Message----- > > From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner > > Sent: Tuesday, April 09, 2013 12:54 PM > > To: [log in to unmask] > > Subject: [TN] Pakeout and PCB Separators > > > > Hi, > > > > > > > > Does anyone know if separators of some type between PCBs can reduce > > bake out time? > > > > > > > > If I have a stack of PCBs, and I place something like paper towels > > between PCBs, can the bake out time be reduced? I would imagine the > > diffusion rates of moisture in the paper towel material would be > > much higher than in solid PCB laminate. But, that is just a guess. > > Could be > perfect hog wash. > > > > > > > > My problem is not with PCBs but with 30 mil sheets of plastic that > > feed a thermoforming process. I am using PETG but I still see small > > bubbles in the material after forming. I tried a short bake out, and > > it helps, but I cannot heat very high as the 30 mil plastic sheets > > will easily deform. I need to lay them flat, heat gently, and still > > try to removed moisture. I was wondering what the best way to > > separate sheets and allow drying might be. > > > > > > > > Any Ideas? > > > > > > > > Thanks, > > > > 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 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] > > ____________________________________________________________________ > > __ > > > > > > -- > > Best Regards, > > *Reuven Rokah* > > Mobile: 972-52-6012018 > Tel: 972-3-9360688 > Fax: 076-5100674 > <http://www.rokah-technologies.com/>[log in to unmask] > [log in to unmask] > www.rokah-technologies.com > > ** > This e-mail message is intended for the recipient only and contains > information which is CONFIDENTIAL and which may be proprietary of > Rokah Technologies. If you have received this transmission in error, > please inform me by e-mail, phone or fax, and then please delete all > of the original files and all other copies exist. > > > ______________________________________________________________________ > 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. 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