Screen Printing Techniques:
Screen printing is a great process for larger order of printed t-shirts and larger designs. Screen-printed t-shirts wash well and can maintain the print quality for some time. Most printing you see in the High Street shops will have been printed this way. although digital printing has become popular for photographs on shirts recently.
When screen printing, one color at a time is applied and therefore the cost will increase with each additional color applied. For each separate color an additional screen is required, so a design with 4 colors in it will need 4 screens, this can make screen printing in many colors uneconomical if only a small run of clothing is required and digital printing might be a cheaper option.
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SIMPLE STEPS TO GET YOUR T-SHIRTS
Step 1: Create Your Image
Create your favorite quotes or some pictures in photoshop and keep it ready.
Step 2: Coat the Screen in Emulsion
The emulsion comes in two parts: the sensitizer and the emulsion. Mix them together according to the directions on the bottle. Lay down your screen. Pour a little of the emulsion mixture on the screen and spread it out on the screen with the squeegee. The emulsion should cover a slightly larger area than the image you want to print. If you need to, repeat the process until the screen is coated and you can’t see through it. You want a thin, even layer across the whole screen.
Leave the screen in a pitch black room for two hours until it’s completely dry.
Step 3: Expose the Image on the Screen
It’s time to expose the screen to the light. In that same pitch black room, lay down a black cloth or board. Lay down the screen and frame with the screen side down on top of the black surface. Then lay the transparency with your image on it on the screen where the photo emulsion is. Tape the transparency down with a piece of glass over it.
Move your lamp so it’s about one to two feet above from the screen. Angle a lamp with the 250 watt bulb at the transparency with your image on it. A desk lamp works best for this, or create a reflector out of tin foil and place it above the lamp to reflect the light down. Do not turn on any other lights. Wait for about 10–15 minutes. Return to the room and carefully pull up the transparency. You should see faint blue lines where the image is burned into the screen. If it looks good, it’s time to clean it off. If not, leave it a few more minutes and check back. Overexposure will make the image bleed, so be careful.
Step 4: Clean the Screen
Spray your screen down with cold water from a sink. Continue spraying it until you can see through your image clearly. Hold the screen up to the light to make sure it looks exactly like your transparency. Let the screen dry. Once it’s dry, cover any exposed parts of the screen with tape.
Step 5: Print
Lay your shirt out on a flat surface. Lay the screen over the shirt with the design where you want to print it.
Pour a small amount of ink horizontally across the top of the screen. Take your squeegee and make one smooth movement down the screen, exerting strong pressure. Run the squeegee up, down, left, and right a couple times to push all the ink through onto the shirt.
Lift the screen up, and you’re done. If you want to make sure the image sticks on the shirt for a long time, throw the shirt in the oven on 400 degree for about 30 seconds.
Step 6: Clean-up
Screen printing ink dries really quick, so as soon as you’re done printing shirts, wash the ink off the screen so you can use it again in the future. If you want to print a completely different image, you can use an emulsion remover to wipe the screen clean so you can reuse the fabric and frame.
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