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Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Steve McConner wrote ...
Very nice! But what exactly is "green house foil"?
Very good question, unfortunately garden related stores do not mix with chemistry (not into details anyway), so I really don't know what this polymer is. what I know is that it's some kind of plastic foil, used to make Green houses (for growing plants). If someone knows the chemical used for it, or the scientific name of this polymer I'd be happy to include that info in my article.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Ash Small wrote ...
Any plastic sheet that doesn't stick to epoxy will do. I think polythene (polyethylene) is one example. (ie poly-tunnel)
EDIT: You can also use wax or a 'mold release agent' (usually a spray) to prevent the epoxy from bonding to the plastic.
Some very good observations, I do believe other plastics would do, but careful about shopping bags: they have colorants that might be slightly conductive and could get into the epoxy layer, the same thing for the other chemicals (mold release agent).
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
OK, so it's polyethylene plastic sheet. That makes sense, PE is almost impossible to glue so it would make a good "mould release". It's also a good dielectric, so who cares if it won't come off.
Some other members here have spent about a year and 100 posts trying to make the best grooved coil former, before finally running out of money, you did it in a day with some cardboard and glue. Good stuff.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Nice bit of winding. just a small point, the wires have a mechanical weak-spot where they enter/exit the winding, fix the core and winding terminations quickly before they break, it's annoying! A small polythene kitchen chopping board is versatile. (self-tapping screws, nuts'n'bolts or cable-ties through drilled holes etc.) Very good insulation but can't be glued to and it sags a little.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
Thanks Vasil,
@Sulaiman, the terminals are actually ticker wire, you can see them in the photos - getting inside the coil where some extra epoxy fixes them in place :
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Steve McConner wrote ...
OK, so it's polyethylene plastic sheet. That makes sense, PE is almost impossible to glue so it would make a good "mould release". It's also a good dielectric, so who cares if it won't come off.
Some other members here have spent about a year and 100 posts trying to make the best grooved coil former, before finally running out of money, you did it in a day with some cardboard and glue. Good stuff.
Yeah you can get that stuff from the paint department of just about any hardware store, it's sold as drop cloth. It really is just about impossible to glue, I tried! Silicone, epoxy, other various glues, they just peel right off.
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Almost perfect homemade flyback secondary
