de-oxygenated plastic
de-oxygenated plastic
(OP)
Is there an of-the-shelf solution to drying plastic in an oxygen free environment? This would be used prior to N2 blanketing.
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RE: de-oxygenated plastic
Why would you want to dry plastic in an entirely oxygen-free atmosphere?
Vacuum dryers give a 'reduced' oxygen atmosphere (e.g Maguire for a fast one, countless others for conventional).
Rgds
Harry
RE: de-oxygenated plastic
My initial thought was to vacuum dry but it becomes complicated because the drying and conveying need to be done in an inert gas. The vacuum bleed-off would need to be done with N2 and the intake of the blower would need to be fed N2... not a practical solution.
My thought was to use a desiccant system that used N2 as the make-up air source. Another possibility would be a compressed air type drier using N2 but I am trying to minimize N2 consumption.
RE: de-oxygenated plastic
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RE: de-oxygenated plastic
How closed is a "closed-loop" drier? If a standard plastic-pellet desiccant-drier was fed N2, could this system dry and remove surface O2?
RE: de-oxygenated plastic
The exact amounts will depend on relative affinities for the plastic and the nitrogen atmosphere.
I strongly suspect the work to determine the affinity of plastics for O2 will not be available.
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RE: de-oxygenated plastic
I might be missing something, but assuming you have your material dried in a batch oven, how do you mould it without exposing it to O2? How do you keep the moulded parts in an inert atmosphere?
Harry
RE: de-oxygenated plastic
RE: de-oxygenated plastic
They work with companies that have come up with proprietary methods of removal.
RE: de-oxygenated plastic
RE: de-oxygenated plastic
I presume others have patent protection or the supplier cannot disclose the process as used by others.
Do you know anything about their "proprietary" methods.
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RE: de-oxygenated plastic
What I mean is, will the oxygen expelled from the surface be enough to prevent all oxygen from coming off. If so, how many flushes at what volume to surface area will you need.
How far does the oxygen permeate into the plastic, and what is the diffusion rate and how is this effected by temperature and concentration gradient.
This sounds like you are working on something quite new or very specialised. I guess it is very confidential.
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RE: de-oxygenated plastic
I can't be real specific using this forum.
Again, if there is someone that knows of an of-the-shelf plastic drier that can provide a nitrogen or argon environment I would be interested in this info.