Dead soft annealing greatly minimizes this issue.
Annealing is generally done before slitting, and winding will work it some more. At some point, I would think ultra thin copper foil (by say .250" or .375" wide) would have issues under winding tension if it were relieved too much.
Is it work harden edges or micro abrasion caused by slitting?
I speculated both in my reply to you yesterday.
Having access to an SEM would prove this theory....which I do
I do not see how. Viewing the profile won't tell you what it will cut through during/after winding, or the hardness. I do have access to one, but my pants are probably not as fancy as yours.
Have you ever been in a converting plant?
I assumed I'd go all my life without someone asking me that... I HAVE!
A friend of my uncle took me on a tour through a PPT plant. The plant was about 10 miles from my uncles home in Niles, IL. My uncle was an engineer at Grumman. His encouragement influenced my major 35 years ago.
BTW, what does that have to do with copper foil shorting thru 50ga FEP? While we are nitpicking (well half of us anyway...), what did you mean by, "Are the V-cap copper/Teflon caps actually Teflon? or perhaps PTFE or FEP
" PTFE and FEP are Teflon. What fluorinated copolymer are you referring to?
What about a slitter or metalizer? Ever design one or work on one? why yes, yes I have....
I have adjusted a slitter at RelCap. Never designed one. I'm not sure how that worked out for you though. It seems these days you are hanging out trolling audio forums behind the guise of a moniker. As proud as you are, I would think you would want everyone to know exactly who you are. Assuming you are a manufacturer, or have been with one, you still do not have much experience with copper foil and FEP parts. If you find vcaps so interesting, why don't you buy one, and cut it open? You could take it back to your laboratory, and tell us all about it
I had the TFTF open 14 years ago when RTI was making them.
At first I thought...Chris...is that you? Then after a little tude and considering 57', I thought...Dan...? But now, I'm thinking Daryl...? In any case this started out with you basically claiming that Eppstein foils was the only game in town... Which it is not. Then, you challenged my "assumption" on a product I said up front I knew nothing about. But, in that, you revealed that you were not aware of a (real) issue with winding copper foil with delicate films that easily cold form. You can drone on, but I'm out