Introduction: Conductive Fabric: Make Flexible Circuits Using an Inkjet Printer.

Picture of Conductive Fabric: Make Flexible Circuits Using an Inkjet Printer.

Extremely flexible and nearly transparent circuits can be made using conductive fabrics. Here are some of the experiments I've done with conductive fabrics. They can be painted or drawn on with resist and then etched like a standard circuit board. Conductive glue or conductive thread is then used to attach the components to the fabric circuit board.

To make this clear, the inkjet printer is not used to directly print resist onto the fabric. Instead, it is only used to print the circuit design onto the conductive fabric. You will then have to hand paint a clear resist over the inkjet image before the circuit can be etched.
See step 1 for details on a printer that may work to directly print the resist onto conductive fabric.

Alternately--an inkjet printer is not necessary--you can just freehand paint or draw on the resist where you want the conductive traces to be.

Pic 1 shows a simple circuit that that lights 3 LEDs. I made some of the traces circular to find out if they would conduct well at angles to the warp and weft of the fabric.

Materials

Performix (tm) liquid tape, black-Available at Wal-Mart or http://www.thetapeworks.com/liquid-tape.htm

Carbon Graphite, fine powder- Available in larger quantities at http://www.elementalscientific.net/
Available in smaller quantities at your local hardware store. It's called lubricating graphite and comes in small tubes or bottles.

Conductive thread-Available in small spools at: http://members.shaw.ca/ubik/thread/order.html
or at: http://www.sparkfun.com/commerce/categories.php?cPath=2_135

Conductive fabrics available from: http://www.lessemf.com/fabric.html

Clear Nail Polish

Crayons

Ferric Chloride etchant available at: http://www.allelectronics.com/cgi-bin/item/ER-3/445/DRY_CONCENTRATED_ETCHANT_.html
or at: http://www.circuitspecialists.com/search.itml?icQuery=ferric+chloride

Inkjet printer

toluol solvent-available at hardware stores

wax paper

Pic 2 shows the three conductive fabrics that were used in this instructable.

1-VeilShield-A mesh polyester plated with a blackened copper. Very light and 70% transparent.

2-FlecTron-copper plated nylon ripstop.

3-Nickel Mesh-Semi-transparent copper and nickel coated polyester.

pic 3 shows the back of the circuit and the glued components.

Step 1: Print the Circuit Pattern With an Inkjet Printer

Picture of Print the Circuit Pattern With an Inkjet Printer

Create a black and white image in a drawing or image program that will be the pattern for your circuit. Print it out onto the center of a piece of copy paper and adjust the image size until you get the exact printed circuit size you are looking for. The final traces should be 1'/8" to 1/4" wide. Make them wider if you plan on carrying more than 100ma of current through them.

Next is to glue a square of conductive fabric onto the center of a standard piece of copy paper (pic 4). Clear nail polish works well as it dries thin and fast (about 5 minutes). Glue all the way across the top of the fabric (the side that feeds into the printer) and then put a blob of glue on the bottom of the fabric to keep it stretched tight.

Then, print the pattern of your circuit board (pic 5) onto the conductive fabric. Sometimes it takes a couple of passes to easily see the pattern on the fabric.

An Experiment That Failed
I originally tried to directly print on the resist with an inkjet printer. I printed the pattern seven times on the front and then seven times on the back to make sure the fabric was well saturated with ink. Unfortunately the ink in my printer (a Canon Pixma MP500) was too porous or not waterproof enough to work as a resist. Perhaps there is some brand of inkjet printer that has an ink that would work.

Wax is very hydrophobic. As you can see in the next step, even wax crayons can be used as resist on conductive fabrics. So, one good possibility for printing resist directly onto the fabric, is a Xerox Phaser or Tektronix Phaser printer that uses a melted wax ink. This very good instructable https://www.instructables.com/id/DIY-Flexible-Printed-Circuits/ by ckharnett shows how he used such a printer to print wax ink resist on special copper-clad polyimide plastic sheet to create flexible circuits. These are expensive, hard to find business printers, but if you can get access to one, it may just work to directly print resist onto conductive fabrics.

Step 2: Paint or Draw on the Resist

Picture of Paint or Draw on the Resist


Nail Polish Resist
For putting resist on the FlecTron (pic 6) or VeilSheild, I painted on clear nail polish. If you put it on thick enough, it will saturate the fabric and resist the etchant on both sides. To keep it from sticking, I painted it on a flat surface with wax paper underneath the fabric. After about 5 minutes it should be dry enough to flip over and touch up any dry spots on the back side.

Draw A Circuit With Crayons As The Resist
See pic 7. It turns out that you can simply draw your circuit pattern on either the FlecTron or Nickel Mesh fabric with crayons. The wax in the crayons is water resistant enough, that even though coverage is not 100 per cent, it works extremely well. The nickel fabric works best with crayons as it is stiffer and fairly transparent. You can place it like tracing paper, over a pencil drawing or printout of your circuit pattern and then draw on it. The traces should be 3/16" or wider. After you have solidly drawn on one side, flip it over and draw in the back side. It must be coated with crayon on both sides to resist the etchant well.

Step 3: Etch the Conductive Fabric

Picture of Etch the Conductive Fabric

For those who have never etched a circuit board, here is how it works.
Ink, paint, tape, or some other material (called a resist) is used to cover parts of the copper clad circuit board and seal it from the etchant. The etchant (usually Ferric Chloride) reacts with any copper that is uncoated and chemically removes it. So, wherever there is resist, the copper will remain. The resist is put on in the pattern of conductive traces that you want your circuit board to end up with.

The process is the same with conductive fabrics, with the exception that we are dealing with a porous woven material that is plated with copper and/or nickel. Conductive fabrics have an extremely thin plating of metal, usually over nylon or polyester. It is so thin that they can be etched in from 5 to 60 seconds. This is with a strong Ferric Chloride solution at room temperature.

Soak the fabric in the Ferric Chloride solution for the following times:

VeilShield-5-10 seconds
FlecTron 30-60 seconds
Nickel Mesh-60 seconds

Remove the etched fabric and rinse VERY WELL with lots of water and then blot on paper towels and hang to dry.

pic 9 shows VeilSheild fabric that has been etched with 3 conductive traces to form an almost transparent, flexible cable. Pic 9b shows the cable with conductive glue and conductive thread.

Pic 8 shows the nickel fabric with crayon resist after etching. The Ferric Chloride etches nickel nicely. Even though there are tiny gaps in the conductive traces, they conduct extremely well. The fabric was soaked in toluol solvent to remove the crayon. Soak in a glass container for about an hour and agitate it occasionally.

Step 4: Completing the Circuit

Picture of Completing the Circuit

It turns out that nail polish resist puts on a very thin insulating layer over the conductive traces. You can make a simple conductive paint that will melt through this insulating layer to create a conductive glue joint. This means you can glue components such as LEDs, Integrated Circuits, resistors, conductive thread or wire anywhere on the conductive traces.

Make Conductive Paint
It is easy to make a conductive paint that is simply conductive glue that has been thinned down. It is thinned down with a solvent in order to stick well to the fabric and melt through the nail polish resist. For more details on mixing conductive glues and paints see:

https://www.instructables.com/id/Conductive-Glue-And-Conductive-Thread-Make-an-LED/

Mix the paint 1-1/2 powdered Graphite to 1 Liquid Tape to 1 Toluol by volume. Mix it fast and mix it well. Have everything you need to glue set up and ready to go as this paint dries fairly fast. Because it is so thinned out, you may have to apply two or three coats to get a thick enough connection to your components. This mix has strong solvent fumes. Do this in a VERY WELL VENTILATED ROOM or do it outdoors.

The conductive traces themselves will usually only add an ohm or less to the resistance. Each conductive glue joint to a component will add about 3 to 5 ohms.

Pic 10 shows the crayon resist circuit with one led lit. the Nickel Mesh fabric is transparent enough that the LEDs can be mounted on the back and the LED glow will come through.

Pic 11 shows the back of the crayon resist circuit.

Comments

wrinex (author)2017-02-07

I used a method so you can etch a real circuit, in this case it was a stator for a electrostatic speaker. ill make a how to soon on my Youtube channel. i used a Xerox Solid ink printer. then use heat to let the wax wrap around each wire so the whole wire is covered before etching , so it stays conductive on both sides. the smallest line in this drawing is around 0.8mm

wrinex (author)wrinex2017-02-07

oh and the smallest line around the circle is like 0.3-0.4 mm but intermited. so that might be to small or to long in the etching tank :)

stephenfitton (author)2014-08-10

Excellent! A few thoughts for an active mind,. Example for thought. Using a tri -colour cartridge and finding a conductive liquid-or combination (2) that would prove conductive and use the third section for a fixative, You would have a UNIVERSAL answer and be able to pocket the profit. Just a thought!

Revanchist (author)2011-12-17

Truly magnificent! All it needs now is a way to avoid getting the components wet, but the shirt washed and we're in business! ... Well I mean washed because regardless of the coolness of the shirt, it'll eventually stink after a week no?

Truly marvelous! I'll add this to the list of DIY projects I want to try, Thanks

Ward_Nox (author)2008-02-14

combined w todays news of fabric that generates electricity this has potential

bdaugherty (author)Ward_Nox2011-07-26

http://en.wikipedia.org/wiki/Thermoelectric_effect shows a device that if you were to keep one side warm (against your wrist for example) and the other exposed to a cooler temperature (surrounding air) that it will generate an electrical charge. :)

adamvan2000 (author)Ward_Nox2008-02-21

You read about that too, eh? That's so cool. Now all they have to do is make enough to make a full article of clothing. ~adamvan2000

zetacool (author)2008-02-21

I wanna stamp my iPod onto my t-shirt. Cos I always forget my iPod and I always use the same T-shirt (yes, thats why I don´t have a girlfriend)

Klappstuhl (author)zetacool2008-02-21

Why didn't anyone think of a fabric mp3 player anyway? It seems rather logical that it would sell quite good.

I'm still waiting for a fabric cell phone that I can velcro to my shoulder.

beehard44 (author)TheDodgyLodger2010-11-20

there is a fabric phone that can be bent and still works. i forgot where i saw it

robbtoberfest (author)2008-02-19

So, so sweet! I want to make a motherboard on my t-shirt and the rest of the components on my jeans.

Watch your resistance carefully.

threefer (author)hypermechanic2010-09-22

Resistance is futile!

rivetgeek (author)hypermechanic2008-11-13

resistance is useless.

Yes, combustibility needs to be address for safety reasons. To much current on this cloth and it may burst in to flames. Though there is an Idea for a electric fuse for say fireworks. This should be used with very small amounts of current. If you need to see an example I think a piece of stripped speaker wire on a car battery would do it. Be careful. The red light followed by the puff of smoke or if you have ever seen an extension cable burst in to flames. If I remember correctly this is nylon fiber for the instructable, that will melt and burn. If you do toast your project please use proper ventilation burning plastic is toxic.

lol, is that a capacitor or are you just happy to see me?

waterppk (author)darkmuskrat2008-02-21

Boy, the inductor sure keeps the current flowing!

adamvan2000 (author)waterppk2008-02-21

I have to say it. I've got a 3 and a half floppy and a 5 and a quarter hard drive. :0P ~adamvan2000

GitarGr8 (author)robbtoberfest2008-02-21

Sounds like a good way to fry your floppy...

misanthrope13 (author)GitarGr82008-02-21

I use solid state.

zawmintu (author)robbtoberfest2008-02-21

rofl planning to integrate a oled screen too? (what about cooling? or is it just going to be hot hot hot? )

gamewinners42 (author)2009-04-01

wait a second...... Did you make a lighted piece of cloth with the Marathon symbol on it? epically awesome.

Carlos Marmo (author)2008-10-30

Wonderful Work! Congratulations!

Gjdj3 (author)2008-07-09

Wow, this is a cool instructable also! I didn't know that this could be done at home. Really nice job.

Edgar (author)2008-02-22

Fantastic!

xenobiologista (author)2008-02-21

My biomedical engineer boyfriend got all excited when I showed him this, then he was like "Oh...it's not medical grade material." (need to use for brain implants =D

Polymorph (author)2008-02-21

Very cool!

Your direct inkjet print didn't work because the ink is wrong. Volkan and Stefan on the Homebrew_PCBsHomebrew_PCBs list figured out that Epson Durabrite or 3rd party pigmented ink will work as etch resist, but only if it is baked before etching.

Full disclosure: I'm owner of that group.

bowmaster (author)2008-02-19

This will come in handy when I am constructing my prototype Ninja suit.

fashiongeek (author)2008-02-15

What an amazing instruction - the BEST EVER I have seen for textile electronic which I am a BIG fanBIG fan off.
I do have one question: does the etching damage or weaken the fabric, make it brittle or easy to tear?

mikey77 (author)fashiongeek2008-02-15

The Ferric Chloride etchant does not seem to adversely effect the nylon (FlecTron) or the polyester (VeilShield and Nickel Mesh) fabrics. They are fairly inert plastics and do not appear to react with it. If anything, the fabrics become more flexible and supple wherever the copper or nickel plating is removed.

wompastompa (author)mikey772008-02-19

how difficult would it be to incorporate this into a standard shirt? perhaps there could be a method of attaching it to where it could easily be removed (as laundering a circuit board seems like a negative action to take : D )

zoundsPadang (author)wompastompa2008-02-19

I;m sure you could spray a protective layer onto it. As long as you remove power sources and treat it as a delicate piece of clothing I'd be willing to bet you could safely wash it.

thinguy (author)2008-02-19

I want to make a T shirt that says Hi

bob31415 (author)2008-02-19

Hi I'm from Ecuador. Your instructable is very funny! LOL!!!!

westfw (author)2008-02-14

So you can etch the conductive coating off of the conductive fabrics? That's very cool... When you're rinsing your etched fabric, don't forget to use LOTS of extra water to avoid having your drain pipes become the next thing to be etched.

GorillazMiko (author)2008-02-14

This is SO cool! All your Instructables are awesome! And that robot thing, is that a helping hands robot? Really cool Instructable as always.

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