Introduction: Screen Print a Poster With Multiple Colors

I have become completely enamored of screen printing ever since I took the basic class at TechShop San Jose.

I've gotten pretty good at printing single color projects, but I thought I would challenge myself and learn to not only print on paper (which is slightly different than fabric) but also learn to use registration marks to print in multiple colors.

Since the silk screen stations at TechShop are set up for 4 colors, I decided to print a 4 color poster.

You will need:
4 Screens
4 Vinyl cut outs (1 of each color you want to print)
A squeegee
An ink spatula
4 colors of ink
Registration tabs
Paper
Blue painter's tape
A wooden or cardboard spacer (will explain further in a future step)

Step 1:

First step may or may not already be done for you.

TechShops come with a standard 4 screen printing station, which are usually set up for printing shirts rather than posters, so you may need to make a new printing platform.

I ordered a bracket that fits on our screening station and simply attached it to a scrap piece of plywood that is bigger than my paper.

Step 2:

To design my screens, I started with a photograph and blocked out the 4 different colors I wanted in photoshop.  Next, I turned it into a vector file (a process you can see HERE).  TechShop has many different software programs to choose from that can turn any image into a vector file, and if you need a hand just grab a DC.

The most important thing to remember when making a print with multiple colors is to leave one part of your print image in every screen (I left the word "Bork") to use to line up your screens.




A side note on my design specifically:
This was my first attempt at screening multiple colors.

Had I known then what I know now I would have made my screens (specifically the red and yellow screens) much larger blocks of color and simply layered the red on top of the yellow, and then layer the black on top of that instead of trying to line up all these complicated edges the way I did.

Live and learn :)

Step 3:

At TechShop, we use the vinyl cutter to make our screens.  To learn more about setting up a screen and printing with vinyl, please see This Excellent Instructable.

Once I had the 4 different files set up, I went to the vinyl cutter and cut them out (make sure your mirror the image before you cut!), weeded them, and put them on the screens.

Step 4:

Lining up multiple screens for a print can be extremely complicated, and many printers have each come up with their own way of doing this.

I came up with this cheater way of lining up the different screens.

Since my file was made digitally, it was very easy to print it out to size using the large format printer.

Once I had my image printed, I cut it out and taped it to an extra piece of paper I was planning on printing on later to make sure everything would be centered.

Step 5:

Next, I took my screens and set them in the different arms of the screen print station.

Step 6:

Now, it was time to line up my print out with the first screen.

To do this, I put the printed out poser on the platform and lowered the first screen over it, moving the printed screen around until the word "Bork" lined up with the vinyl cut out words.

(The second picture is a bit hard to see, but I had the "Bork" lined up)

Once you have the first screen lined up, tape down your printed poster to the board and line up each of your other screens.

Once all your screens are properly lined up, tape off the part of your screen you were using as a registration mark on each screen except the screen of the actual color you want for that part.

Step 7:

Once I had the printed poster and screens where I wanted it, I lined up my registration tabs.

Registration tabs are these neat little metal pieces that help you to line up paper when you are printing multiples of anything.

To use them, simply line up 2 in each of the bottom corners of your paper and tape down the outside tabs to the table.
I also added one on each of the long sides of my paper so I know they will line up properly.

Once you have the outside tabs taped down, simply remove the paper and tape down the bottom part of the metal tabs to the table as well.

Step 8:

Once you have your tabs in place, slide a nice clean piece of paper in.

The last step before you start printing is a step that is specifically for printing on paper, wood, metal, or any other material that will not immediately soak in the ink like fabric, and this is to put a spacer (approximately 1/8"-1/4")between the top of the paper and the bottom of the screen.

Since the ink does not soak into the paper the way it soaks into the fabric, the space helps prevent smudges and bleeding.

Most people use cardboard or thin pieces of scrap wood to make their spacers.  I happened to have a wooden ruler that was the perfect height for my set up.

Step 9:

Now that your set up is ready, simply mix your ink (make sure to add Stay-Open if you are doing a lot of prints to stop your ink from drying too fast) and INK IT!

A good rule of thumb to use when deciding on what color order you want to ink your posters is to start with the lightest colors and work your way to the dark, especially when you are creating layers like on my poster.

If you wanted to experiment with opaque colors, then start printing from the background colors and move forward through the layers.

I inked approximately 30 posters, and I found it to be much easier to do all of one color, then go and wash the screen and squeegee before starting the next color.

Although you could use a flash dryer (most TechShops have one) and ink all 4 colors on one poser at a time, I was worried the ink would set into the screen too fast.  Also, I would be stuck cleaning all 4 screens at the end rather than getting to clean one at a time. 

Step 10:

There you have it!  Tons of posters; hand inked!

Comments

author
rich_j_l (author)2014-11-21

I really love the print...it's just so cool

author
circuitfish (author)2014-09-03

An easy way to line things up rather than using your image alone to register the screens is to hit "print trim marks" and set the thickness to the heaviest line it can print the trim mark in your vector program's print settings and then go through each screen, lining them up with a print onto a sheet of paper larger than your poster. Once that's printed, you can either tape it in place, hit it with crystal clear and let it dry on the platen, then use the printed trim marks on the sheet to register the edge of each poster ( since the trim marks should match your poster's edges. ) or, if you don't have crystal clear, you can use a straight edge to draw a line through each set of trim marks onto the platen and then put some blue tape along those lines to line up each poster on. Once you're satisfied with the registration, you can tape off the marks in the screen and just go nuts. Since it's on a 4-head and you've got your platen marked, you can just go through every colour on each poster at once and not worry about having to move things around.

author
Preft1986 (author)2013-02-06

I loved the italian portrait, thanks for sharing

author
lafnbear (author)2012-07-27

Excellent work! A tip to make it a little easier next time: create registration marks in the blank margins of your digital art (just draw or type a simple cross or plus sign) that you allow to output on each color separation (the separate outputs you show for each color in Step 2). How you then use those: get your first screen lined up, and print a few extra of that first screen with the reg marks showing, then tape off the reg marks and print your intended quantity. Then use some of those extras (retaining a few for each color you're printing) to set up the next color screen. As you test print the second color onto the extras of the first color, you'll be overprinting the reg marks in the second color onto the reg marks from the first color. Once they lineup "perfectly", tape off the second color's reg marks & do your full run. Repeat for each color. For a video tutorial on how to add reg marks in Photoshop, see http://www.youtube.com/watch?v=tAvaeMDjnjU

author
MikeCicc (author)2012-07-26

This is sweet! I just took the vinyl cutting class at Tech Shop SF and wanted to make my own posters! Thanks for the inspiration.

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