AfterDark: 2010

Bonus: The Mod Podge Method

In spirit of frugal screen printing, this post is dedicated to the most frugal of frugal screen printing methods, the mod podge way.

*Note: This method is best for simple designs, anything super complex will just give you a headache.

Materials

-Fabric Ink
-Organza or any kind of sheer curtain fabric
-Embroidery hoop
-Mod Podge glue (~$5 available at Walmart-arts and craft section, Hobby Lobby, and Michael's)
-Small paint brush or sponge brush
-Contact/Wax paper
-Piece of cardboard or a few sheets of newspaper
-Pencil/Marker

Step 1: Draw or print out a design on a piece of paper, doesn't matter what kind.

Step 2: Turn your embroidery hoop into a screen: Take the curtain fabric and fasten it into the hoop. Make sure you use enough fabric to place it securely in the hoop and make it nice and tight.

Step3: With your pencil or marker, trace your design onto the inside of the screen. (See why I told you simple designs only?)

Step 4: With a small brush or sponge brush, apply Mod Podge to areas you don't want ink to go through. The glue will keep the fabric ink from going through. Let it dry throughly-it should be clear once it's done.

Step 5: Prepare your shirt: Slide a piece of cardboard or a few sheets of newspaper underneath the inside of your shirt to prevent the ink from bleeding through to the other side.

Step 6: Place your embroidery hoop screen on the area you want to print on your shirt. With your brush or sponge, start applying the fabric ink onto the screen. Once finished, carefully lift the embroidery hoop and voila, a freshly printed shirt.

Step 7: Let the shirt dry, preferably overnight. After it dries completely, place a sheet of contact or wax paper over the image and iron it. The heat of the iron will set the ink so that it doesn't wash out...or you can forget about waiting a really long time and use your heat gun.

Final Step: Enjoy your new shirt!

Steps to Screen Printing Pt. II

Continued from Steps to Screen Printing...

6. Take your newly exposed screen and lay it, frame side up on the t-shirt. You will need to keep the screen steady as you pass the squeegee over it, so use clamps or a willing friend to hold it down.

7. Choose the color ink you want. Using a spoon or Popsicle stick, begin laying some ink across the top of the screen-try to use an even amount of ink throughout this process.

8. Take your squeegee and place it above the ink on the screen. Holding it at a 45 to 60 degree angle, push down on it and begin passing the ink through the screen in a downward motion. When you reach the bottom, repeat the process-this time going up. Never move the shirt while doing this, since it will mess up your print.

9. Lift the screen off your shirt. You should have a brand new freshly painted t-shirt! You are free to print out another shirt, just repeat step #8. If you're done printing, leave your shirt where it is and begin the process of cleaning the ink from your screen before it dries-it's a pain to clean up if it does, so avoid it at all cost.

10. Using the squeegee, take any leftover ink from the screen and return it to its container. Take your screen to the nearest bathtub or sink and using soap and hot water, wash your screen. Use mineral spirits to scrub off stubborn ink from the screen. Once dried, you can keep the screen as it is in case you want to print out the same design in the future or you can reclaim the screen.

To reclaim the screen, you will need stencil remover to help remove the dried on emulsion. Apply the chemical on the screen and blast it with hot water, using a nylon bristled brush to break away the emulsion. Afterwards, degrease the screen using Simple Green or the unscented dish washing soap and let dry. Your screen is now be ready for another design.

An outline of the image you've just printed will most likely appear on the screen after you've cleaned it. This is called a ghost image and is perfectly normal, though slightly annoying. It shouldn't interfere with any future printing as long as the screen is clear or translucent when you hold it up to the light. If you find there is still some ink in between the screen’s mesh, use a degreaser and scrub some more.

Picture of ghost image. You can still use the screen as long as there's no ink blockage in the mesh.

11. Back to the shirt. Using the heat gun, hold the gun four to five inches away from the shirt and begin drying your printed design in a circular motion, spending no more than a few seconds on a particular spot to prevent scorching. Remember, the heat needs to reach at least 320 degrees Fahrenheit to fully set the ink in. Use the temperature gun to gauge how hot the heat coming from the heat gun is. Once finished, you should have a fully dried shirt.

Congratulations! Pat yourself on the back, 'cause you've just printed your very first shirt!

Steps to Screen Printing

We've covered the materials needed, how to make the screen, and the exposure lamp. We've also covered the images to print. Now it's time for the fun stuff. The actual screen printing.

1. Degrease the screen: Using regular unscented dish washing liquid (absolutely no orange, lemon, or whatever fruit scented soap) or Simple Green, wash any dust or oils from the screen and let it dry. The dish washing liquid needs to be unscented because the oils that make the soap scented are similar to the oils you're trying to get rid of in the first place.

2. Tape off the edges of the screen. This will make cleaning much easier and save not only your ink but emulsion as well, which we'll be using to coat the screen. Following the directions on the emulsion container, spread your prepared emulsion in an even coat on both sides of the screen using the scoop coater/emulsion trough. If you don't have one, simply use the squeegee, holding it at a 45 degree angle-clean it afterwards.

Depending on your emulsion's instructions, coat the screen in a dark place where no natural light can go through. You can use a simple bug light to help you see what you're doing. Take some push pins and tack them onto the wooden corners of the screen, this will allow the emulsion to dry without coming into contact with the floor. Finally, let the screen dry in the dark in a horizontal position. You can take off the pins when done.

3. Draw or print your design onto a sheet of transparency paper. The design has to be opaque-absolutely no light can shine through the black ink. If you have to, print out two transparencies and place them on top of each other.

4. Now, you are ready to expose. Turn on your handy dandy exposure lamp. Place black foam (or cardboard painted black) underneath your screen.

Position your transparency wherever you want it on the screen and place a piece of glass (taken from a picture frame or found in Home Depot) over it, this will weigh down the transparency so it doesn't move anywhere. Because the heat could crack the glass, keep a small fan turned on nearby.

Burn the screen for at least 18 to 20 minutes. It could be more or less depending on how far the bulb is from the screen-usually, the closer it is, the less time it should take to expose.

When finished, run your screen under the shower with lukewarm water. The emulsion will wash away, leaving your design fully visible. Like step #2, tack four push pins onto the screen to allow it to dry throughly.

5. Lay your t-shirt flat on a table. If needed, you can use spray adhesive to keep it from moving. Remember to place a few sheets of newspaper or a piece of cardboard on the inside of the shirt to keep ink from going through to the other side.

To Be Continued...

Let's Talk Images

A t-shirt is all about images. A message you want the world to know or a picture you want your friends to see. What you print is just as important as how you do it.

You've found the perfect image that would look great on a shirt, how are you going to print it?

Simple. Sort of. You need to take that beautiful, colorful picture and turn it into black and white. Why? You'll find out in just a minute.

Remember the transparency paper I listed in the materials section? Since we're screen printing via the emulsion method, our image needs to be printed onto one or two transparencies in black ink. You can choose whatever color paint you want to print the shirt, but your transparencies need to come out in black only.

Say you've chosen this picture:

Yay, Asian Kung-Fu Generation!

Ahem. Using your favorite imaging software (I'm using Photoshop, but you can certainly use Gimp, Paint, or even Word) and turn the image into black and white. Think of the image as a stencil-if you were making a stencil, the black part of the image would be the part you cut out so that when you ran the paint roller over it, the image would print.

Similarly, the black ink on your transparency will serve to block out the ultraviolet rays from your exposure lamp. When you wash out the emulsion, the parts previously covered by the black should wash out easily and thus make your image t-shirt printable.

Here's how the picture turned out. Now just turn that printer on and hit 'print.'

While you wait for your printer to finish printing, enjoy this music video by

Asian Kung-Fu Generation...

Exposure Lamps

I take my newly constructed screen with the emulsion I've prepared. After I let it dry, I pick up the screen and locate the image I'll be using. I plan to go outside and expose the screen the natural way, with the sun. To my surprise, however, as I open the door I realize that it is just beginning to rain. 'No screen printing today, then...'

Not if I have an exposure lamp. Exposure lamps or units are useful for preparing a screen for screen printing. Though we can use the sun, it is difficult to control the amount of UV ray exposure that the screen is getting. Sometimes it may be too little and the emulsion will wash out in unintended areas, other times it may be too much and you'll end up baking the emulsion directly onto the screen-which is not good. Other times the weather just won't allow it.

To build an exposure lamp is actually pretty simple. All you need is some PVC pipe, a 500 watt halogen work light, a saw, and a power drill, all conveniently found at your local hardware store. Below is a video that gives more in-depth information on how to build one...

Following the instructions in the video, I created this:

Not bad. For someone who is mechanically challenged. It even stays upright.

Making the Screen...

I find a day when I've nothing to do. No ten page essays, no chores to finish, nothing. I decide to print a shirt. I have the table set and ready to go, the ink mixed, and the shirt fit snugly into place. All I need now is the screen. I gasp in horror as I realize my trusty screen is not where it's supposed to be and quickly set out to look for it. Ten minutes later, I finally manage to pull it out of the dark recesses of my closet.

"What the-?" I ask myself as I stare at the hole in my screen. It looks like the screen got caught in something and has been punctured.

Muttering profanities, I analyze the extent of the damage, hoping for the faintest sign of good news. There are none. There's no way to fix this-the mesh has got to be replaced. Time for a new screen.

I could run out and buy one, but the closest place to get one is about twenty minutes away. Twenty minutes I don't want to spend driving in Perimeter traffic. So, I'll pass on that and opt to make my own. I have the will, I have the technology.

Okay, how do I make one?

Making a screen is a simple process that involves any old wooden picture frame, a staple gun, and some nylon or silk fabric, which doesn't have to be the fancy hundred dollar screen printing mesh-just as long as it's polyester. I hear organza works very well too.

You will need to staple the mesh onto the frame, making sure that the mesh is stretched tightly over the frame. Any slack in the screen and you'll have to start over because, trust me, your prints will not come out good.

Or, if you’re an avid do-it-yourselfer and don’t want to ruin any picture frames, you can check out this YouTube video to learn how create your own wooden frame.

Materials: What You Need To Start

In order to start screen printing, we'll need a couple of things. The easiest way to get these much needed supplies would be to buy an introductory screen printing kit. They are available in different price ranges and though it's not usually top notch quality stuff, the kits are intended to give you an idea of all the things you'll need to start your adventures in screen printing.

Or, you could buy things one by one. If that's the case, I’ll outline a basic list of materials and equipment that will help you get started.

Note: This list is a work in process and will most likely get longer as time goes by.

What you’ll need is:

The Screen

Of course. The screen will be the medium through which the ink will go through and transfer onto your shirt. You can buy one already meshed and ready to go or make one yourself using polyester mesh.

A Squeegee

What you’ll be using to actually pass the ink through the screen and onto the shirt.

Some Textile Paint

Since we will be specifically dealing with t-shirts, textile paint is the way to go. If you plan on screen printing posters, other paints are perfectly fine to use too.

A Few Sheets of Transparency Paper

You’ll need to print out the image that will go on shirt onto transparency paper using black ink. Depending on your printer, you may need either laser or inkjet transparencies.

A Heat and Temperature Gun

For the textile paint to fully dry and stay on your shirt without washing off, you’ll need to cure it. Because a flash unit, conveyor dryer, or heat press cost a lot of money, the next best thing is to use a heat gun (available at a local hardware store for about $20) to cure a t-shirt because it can reach high temperatures.

The temperature gun is optional really, but useful because you’ll use it monitor the heat, making sure the temperature reaches at least 320 degrees Fahrenheit—that’s the temperature you’ll need to reach in order for the paint to fully adhere to the fabric. Any temperature lower than 320 will only cause the ink to come off in the wash and a temperature higher than that will mess up the ink and ruin the shirt.

If you really want to be cheap when it comes to screen printing, I suppose you could stick your freshly printed shirt in your kitchen oven and cure it that way…but that may be a bad idea for the following reasons:

1. The textile paint may release toxic fumes, rendering your oven unusable for food making.

(hmm…toxic flavored cookies…)

2. There's a possibility you might set your home on fire.

(that’s never good)

And finally,

3. Too much heat will burn and ruin the very same shirt you worked so hard to print.

A Coating Trough and Some Photo Emulsion

The nice thing about screen printing is that there are many ways to do it. Taping a stencil to your screen and passing a squeegee over it is one way. But, while stenciling is good for simple designs, it becomes time consuming and tedious when doing designs that have a lot of detail, so the next best thing to use is photo emulsion.

Photo emulsion is a photosensitive liquid substance that you apply to the screen using a coating trough (a squeegee will work just as well). When exposed to UV light, it hardens. There are different types of emulsion out there and are usually available at art supply stores or online, the price varies.

An Exposure Lamp/Unit

In order to print an image onto a shirt, you need to expose a screen that has been layered with photo emulsion and exposed to UV light. The sun is a perfect source, but it’s not constant. You don’t want to over expose your screen because it will damage it, but you don’t want to under expose it either because all of the emulsion will wash out.

Though you could run out and buy the latest in exposure unit technology, it is pretty pricey and since we’re just starting out, it may not be a good idea to invest such a large amount of money yet. So, a regular 500 watt halogen lamp will do (Like the one in the picture). You can get these at your local Lowes or Home Depot for around ten to fifteen dollars.

If you don’t mind waiting 30 to 60 minutes to expose your screen, you can use a regular light bulb as well.

...

Other supplies will probably be added to the list in the future, but for now these should be enough.

Intro to Screen Printing

So, you want to learn how to screen print but you don’t know how.

Well I’m here to say that…I don’t either. Yes, that’s right. I am by no means an expert on the subject and therefore not technically qualified to attempt a screen printing tutorial but I’m gonna give it a shot anyway.

This is only one of the reasons I started this blog. Many in depth tutorials are aimed at people who want to screen print as a living, tending use pricey materials and equipment. While these tutorials are a great resource to use and offer a lot of advice from the pros, they are not very practical to the hobbyist or occasional printer. This blog will aim to make screen printing as painless on the wallet as possible. Another reason for creating this tutorial is that I may possibly fail a certain class if I don’t do this blog thing, but that’s another story…

That's great and all, but what is screen printing?

Screen printing is an art technique where an image is transferred to paper or an article of clothing via a woven mesh that supports an ink-blocking stencil. As a roller or squeegee is moved across the screen, it forces ink past the woven mesh onto whatever surface is printed on, thus creating a nice t-shirt or poster. Oh, and just so you know, other names for screen printing include silkscreen printing and serigraphy.

http://enjeru.deviantart.com/art/The-Screen-print-shop-93430442

Coming from a new screen printer to other new screen printers, this blog will contain tips and how-to’s that I've come across and tried out myself as I start exploring the art of screen printing. And so with that, I look forward to posting more in the near future. See you then.

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