Last time opinions of Vapor Phase came up on this forum, respondents
indicated that cleaning the flux residue out of these systems was
significantly worse than a comparable convection system. Is that still
true? Some systems do note even have filter loops for trying to remove
such contaminants!
In the beginning of this thread there was a suggestion from a supplier
that the same fluid can be used for both Pb and Pb-free assemblies.
That seems like it might need some qualifiers!
When we examined Vapor Phase, another issue was the length of the
cooldown segment unless you got additional chillers installed. Also, if
many are moving toward these, we can expect that EPA will eventually
require vapor recovery systems.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, May 12, 2008 11:48 AM
To: [log in to unmask]
Subject: Re: [TN] Vapor phase
Oh! OOOOH! BIG environmental concerns with Galden. GWP in the tens of
thousands (CO2 = 1), pretty well on a par with SF6. These PFCs are
controlled substances under the Kyoto Protocol.
Brian
Bill Kasprzak wrote:
> Gosh, with all due respect, I'm sure the equipment is using the Galden
> fluid for vapor and that drag out if any is minimal. No environmental
> concerns as far as I can tell.
>
> I think vapor phase will be the comeback kid in the years to come
> because of the even distribution of heat. (We do not have any
> lead-free soldering issues here)
>
> What I'm really talking about out is how inconsequential our impact on
> global warming compared to the enormous volcanic eruption in Chile.
> Some of the photo's are incredible. Maybe Steve can post them. I think
> they are available from the UK's Daily mail website.
>
> What's happening right now in Chile is a huge environmental disaster
> and no one, no laws, no regulations can do anything about it. It just
> shows how inconsequential we really are.
>
>
>
>
> Bev Christian <[log in to unmask]>
> Sent by: TechNet <[log in to unmask]>
> 05/12/2008 09:26 AM
> Please respond to
> TechNet E-Mail Forum <[log in to unmask]>; Please respond to Bev
> Christian <[log in to unmask]>
>
>
> To
> [log in to unmask]
> cc
>
> Subject
> Re: [TN] Vapor phase
>
>
>
>
>
>
> Ioan,
> Ask the supplier what is the global warming potential of the materials
> they are proposing as the thermal transfer material. Then you have to
> decide if you can live with the answer.
>
> Also, RF cans with small holes can be problematic.
>
> Bev
> RIM
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
> Sent: Monday, May 12, 2008 9:24 AM
> To: [log in to unmask]
> Subject: [TN] Vapor phase
>
> Dear Technos,
>
>
>
> I would like to get your expert opinion on the latest developments in
> the vapour phase technology. The last time this topic has been
> discussed here this was still an environmental hazard.
>
>
>
> Here's the latest sales pitch:
>
>
>
> Dear Convection Oven Users:
>
> With Energy Costs Skyrocketing, You have a cheaper, efficient, and a
> better yield Alternative!!
>
> Low Operating Cost, 110 Volt Machine, Run Lead and Lead Free
> Sequentially!!
>
> High Yield, Run your Lead Free Boards at 230 Degrees Uniform
> Temperature Distribution, No Circuit Board Delamination, Uses
> Environmentally Friendly Teflon 2 Liquid No Hazardous Florocarbons!
>
>
>
> The questions are:
>
> * Are the advantages real, should I prefer vapour phase over
> convection in day by day reflow operations, from the technical point
> of view?
>
> * Would the technology finally be environmentally friendly?
>
>
>
> Thanks,
>
>
>
> Ioan
>
>
>
>
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