1/2 mil Mylar for ESLs - Page 2

phishead8 · 3rd November 2001, 07:00 PM

Hedlund,
How is this PET film pretreated for metalization? Does that mean that it is metalized? How wide is your roll of film? Yes, you are close enough in your conversion from metric to imperial measurements. 12um = 48 guage = .48 mils ~= 1/2 mil film.

What rig do you use to stretch your film? I've had difficulty with the stretch and tape method (see above). Are there any drawbacks to the heat-shrinking method other than overall evenness? Durability? Longevity? Because I feel that the heat-shrinking method is even enough, unless I'm proven otherwise.
Thank you very much for your input.
-Dan

Hedlund · 3rd November 2001, 07:55 PM

No it's not metalized, but the surface doesn't seem to be perfectly smooth. Rifa use this film to make their metalized capacitors.
One of the rolls is 480 mm and the other 650 mm.

phishead8 · 17th December 2001, 04:05 AM

Well,
Due to time constraints I am forced to abandon my idea of finding the heat-shrinkable mylar that Barry sold me over the summer. Instead, I have plain ole' PET film, which is the generic version of DuPont's Mylar. I will swallow my pride and build a tensioning rig, but I'm not sure exactly how to do it.
Let me throw out this idea for a tensioning rig to see if anyone can point out any flaws or suggest anything. I plan on laying out the mylar and glueing some steel unistrut (big-boy "erector set" pieces that I have lying around) to two opposite edges. I will then drape the film over a rigid piece of metal. Then, I can add weight to both unistrut pieces (which are now hanging down on the sides) until I am satisfied with the tension of the film. Glueing on the stators will be a cinch. The tension will be the same for each panel, as the weight will not change between the construction.
An obvious problem with this is the tension is only in one direction, not both. But, I cannot see why this would be such a bad thing.
Anybody have other suggestions/comments for me? Please respond.
Thanks
-Dan

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3rd November 2001, 07:00 PM	#11
phishead8 diyAudio Member Join Date: Sep 2001 Location: Pasadena, CA	Hedlund, How is this PET film pretreated for metalization? Does that mean that it is metalized? How wide is your roll of film? Yes, you are close enough in your conversion from metric to imperial measurements. 12um = 48 guage = .48 mils ~= 1/2 mil film. What rig do you use to stretch your film? I've had difficulty with the stretch and tape method (see above). Are there any drawbacks to the heat-shrinking method other than overall evenness? Durability? Longevity? Because I feel that the heat-shrinking method is even enough, unless I'm proven otherwise. Thank you very much for your input. -Dan

3rd November 2001, 07:55 PM	#12
Hedlund diyAudio Member Join Date: Oct 2001 Location: Alvesta, Sweden	No it's not metalized, but the surface doesn't seem to be perfectly smooth. Rifa use this film to make their metalized capacitors. One of the rolls is 480 mm and the other 650 mm.

17th December 2001, 04:05 AM	#13
phishead8 diyAudio Member Join Date: Sep 2001 Location: Pasadena, CA	Well, Due to time constraints I am forced to abandon my idea of finding the heat-shrinkable mylar that Barry sold me over the summer. Instead, I have plain ole' PET film, which is the generic version of DuPont's Mylar. I will swallow my pride and build a tensioning rig, but I'm not sure exactly how to do it. Let me throw out this idea for a tensioning rig to see if anyone can point out any flaws or suggest anything. I plan on laying out the mylar and glueing some steel unistrut (big-boy "erector set" pieces that I have lying around) to two opposite edges. I will then drape the film over a rigid piece of metal. Then, I can add weight to both unistrut pieces (which are now hanging down on the sides) until I am satisfied with the tension of the film. Glueing on the stators will be a cinch. The tension will be the same for each panel, as the weight will not change between the construction. An obvious problem with this is the tension is only in one direction, not both. But, I cannot see why this would be such a bad thing. Anybody have other suggestions/comments for me? Please respond. Thanks -Dan

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