also see: Materials >> Conductive Threads
You can’t solder to most conductive threads, but there are conductive threads that are actually made by spinning very thin flattened wire around a soft, flexible core, and these are great for soldering to.
In particular I did tests on a range of these threads from a company in Germany called Karl Grimm and these gave the best results. Their threads have Kevlar, and Vectran cores with very thin flattened wires wrapped around them. So the solder makes the connection to wire and not to thread, and that is why the results are so good. The threads are very soft and flexible, but the wires are visible and I imagine make them less fit for the sewing machine. Aesthetically they are very decorative.
>> http://karl-grimm.com/navi.swf
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Hey guys, I have a great method for this. Get a metal crimp bead from a jewelry store and crimp it around the conductive thread, then you can solder that to anything. Or you can crimp the bead to both the thread and the wire if you need too. Way easy to do. I use this method all the time and it works great.
sounds good, but i wonder, if normal solder clips from the hardware-store aren’t cheaper and euqally useful.
Hi,
How can I purchase theses threads in USA?
Thanks
You’ll sometimes find these same spiral threads in super-flex wire, like that used in telephone cords.
It’s handy that you can solder to it, but I think Alison’s idea is better – the electronics industry only solders flexible wire directly when cheapness is the overriding consideration. Soldering a flexy wire makes it stiff, and the solder wicks up the wire so it’s stiff for a little way outside the joint. Then the point where the wire changes from flexy to solder-hardened is where it always breaks. That’s why crimps have become so popular in the industry (and they’re faster, too .. the downside is that the proper tools to fit them are expensive).
Heya-
After a year of pestering them Karl Grimm finally sold me some of their thread and it works great. I sell it at http://www.etsy.com/shop/ladycartoonist?ref=si_shop
It has way lower resistance than the other threads, too- 2.5 ohms a yard.
wonderful, this is great to hear that we can now buy small amounts of karl grimm thread through etsy!
[...] thread), stainless steel thread (3 diameters, tarnish resistant, also works as a heating element), solderable thread. Disadvantages of conductive thread: silver-based thread oxidizes, frays easily, knots come [...]
Very interesting.
There are other methods of interconnecting fabric to wire but the tubular crimp mentioned above works great in most cases. There are silver based conductive adhesives from Elsworthy(resinlab) which work great but take time to cure. They are a lot less brittle and difficult to work with than solder. They are $$ though. Its also worth looking at conductive tapes from Adhesives Research and 3M. Some adhesives conduct in 1 direction only which is very handy. 3M 7303 and 3M 9707? come to mind.