https://www.google.com/patents/DE202013 ... CEEQ6AEwAQ
Interesting read on the patent pending vat release the Solidator uses. Really innovative, using FEP and its oxygen permeable characteristics.
And a read on the oxygen permeability of FEP.
http://onlinelibrary.wiley.com/doi/10.1 ... 260832/pdf
Solidator Vat Release Patent
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Solidator Vat Release Patent
@AndersonHTa
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Re: Solidator Vat Release Patent
An interesting link on Permeation of FEP film
http://www.magnatexpumps.com/pdf/permeation_effects.pdf
and here is a nice book on permeation of plastics
http://books.google.be/books?id=O4yFcup ... lm&f=false
duponts info on permeation:
http://www.rjchase.com/fep_handbook.pdf
http://www.magnatexpumps.com/pdf/permeation_effects.pdf
and here is a nice book on permeation of plastics
http://books.google.be/books?id=O4yFcup ... lm&f=false
duponts info on permeation:
http://www.rjchase.com/fep_handbook.pdf
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Re: Solidator Vat Release Patent
Hmm,
i dont get it, how they made a "patent pending" when the complete process is still patented by envision technology?
i dont get it, how they made a "patent pending" when the complete process is still patented by envision technology?
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Re: Solidator Vat Release Patent
Im very interested in exactly how the Solidator releases the part.. I took a look at the patent but it doesnt make much sense to me. Can someone break it down for us?
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Re: Solidator Vat Release Patent
Interesting read. Since I didn't see any reference to moving the vat I assume they are just lifting the z axis and letting the fep membrane pull off. They talk about the membrane being permeable to a gas/liquid which inhibits resin cure so it shouldn't stick. The slight flex to the membrane must be enough to pull away at the edges. By eliminating the tilt they effectively speed up the printing.
Since there is a gap I wonder how they keep the membrane from sagging under the weight of the resin. Unless they fill it with a liquid to support it.
Thinking about that, I came up with this idea for a vat that uses a liquid supported membrane and a piston to draw it down away from the cured resin. The build platform only has to be raised up the layer thickness and the membrane returned to neutral. Backlash in the z axis is eliminated because movement is only in one direction (up).
Since there is a gap I wonder how they keep the membrane from sagging under the weight of the resin. Unless they fill it with a liquid to support it.
Thinking about that, I came up with this idea for a vat that uses a liquid supported membrane and a piston to draw it down away from the cured resin. The build platform only has to be raised up the layer thickness and the membrane returned to neutral. Backlash in the z axis is eliminated because movement is only in one direction (up).
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Re: Solidator Vat Release Patent
they pump air between the cap and keep a pressurized gap (1 atmosphere pressure i think)
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Re: Solidator Vat Release Patent
FEP is an oxygen permeable membrane. Solidator uses a pocket of air between the FEP film and the glass window of the vat bottom, that pocket of air has a constant air flow from a compressor. No pressure build up, just constant air flow. Since FEP is oxygen permeable, air can pass through the membrane and negate any vacuum forces that occur. You can't form a vacuum if the surface is actually porous and having air flow through it.
Does that make sense?
Does that make sense?
@AndersonHTa
Re: Solidator Vat Release Patent
just speculation but I suspect what may be happening is that the fep actually lightly lays on the vat floor because the air pressure under it is only slightly above ambient air pressure and is held down by the weight of the resin, when the vat tilts (if that's their method) or the build plate lifts the fep "membrane" lifts very slightly under light air pressure and allows air under it, some of this air "diffuses" basically atom by atom through the fep with enough oxygen to "refresh the oxygen layer on the top surface of the fep (it probably doesn't take much). The oxygen on the top layer of the fep probably refreshes the "hydrophobic" properties of the fep rather than actually breaking the vacuum. Oxygen would constantly be diffusing through the fep with a "push" every layer cycle.
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Re: Solidator Vat Release Patent
Could this be made to work with a fluid instead of air? would something like water or some other fluid be able to carry and release enough oxygen through the film to allow the oxygen inhibition layer to form?
Maybe when the layer is printing the film is resting against the vat bottom and when the part raises the fluid is pumped in and the film raises off the vat bottom and then the fluid is pulled back out.
What do you guys think?
Maybe when the layer is printing the film is resting against the vat bottom and when the part raises the fluid is pumped in and the film raises off the vat bottom and then the fluid is pulled back out.
What do you guys think?