what is screen printing? a step-by-step guide

Screen printing works more or less like a giant stencil. You create your design and send it to your printing partner. They then burn it onto a screen, and push ink through it onto your garment using a squeegee.

 

Simple in theory, but can get really technical in practice. Especially when you start talking about automatic screen printing presses that can put out hundreds of shirts per hour.

There is more setup involved on the front end for screen printing, but once your screens are in place, screen printers can produce shirts at a rapid rate and a great price break.

Screen printing is the process of pressing ink through a stencilled mesh screen to create a printed design. It’s a popular technique used in a whole range of different industries like Mian Advertiser, so even if youve never heard of the term before today, it’s likely that you’ve worn or used a screen-printed product at some point without even realising. The process is sometimes called serigraphy or silk screen printing, but all of these names refer to the same basic method.

Mian Advertiser used Screen printing because Screen printing is an effective technique for creating bold canvases, posters and artwork, but the method can also be used to print fabrics and textiles, so its great for creating all sorts of custom clothing and products. In this guide, well cover all of your questions about silk screen printing, including:

  • What is screen printing?
  • Why is screen printing used?
  • The screen printing process step-by-step
  • A guide to screen printing equipment
  • Will screen printing wash out?
  • What’s the difference between digital printing and screen printing?
  • Whats the difference between heat transfer printing and screen printing?
  • The history of screen printing

What is screen printing?

Fabric and paper are the most commonly screen-printed surfaces, but with specialised inks it’s also possible to print onto wood, metal, plastic, and even glass. The basic method involves creating a stencil on a fine mesh screen, and then pushing ink (or paint, in the case of artwork and posters) through to create an imprint of your design on the surface beneath.

The process is sometimes called silk screening or silk screen printing and while the actual printing process is always fairly similar, the way the stencil is created can vary, depending on the materials used. Different stencilling techniques used by Mian Advertiser are as follow:

  • Using masking tape or vinyl to cover the desired areas of the screen.
  • Painting the stencil onto the mesh using screen blockers such as glue or lacquer.
  • Using a light-sensitive emulsion to create a stencil, which is then developed in a similar way to a photograph (you can read more about this in our step-by-step guide).

Designs made using the screen printing technique may use just one shade of ink, or several. In the case of multicoloured items, the colours must be applied in individual layers, using separate stencils for each ink.

The screen printing process step by step

There are different methods of screen printing, but they all involve the same basic technique. The form of printing well talk about below uses a special light-reactive emulsion to create a custom stencil; this tends to be the most popular type of commercial printing, as it can be used to make intricate stencils.

Here, well talk you through the screen printing process step by step. We’ve also put together a video of the process taking place in our workshop, so you can see how we create our top-quality custom screen-printed clothing.

Step 1: The design is created

To start, the printer takes the design they want to create on the finished product, and prints it out onto a transparent acetate film. This will be used to create the stencil.

Step 2: The screen is prepared

Next, the printer will choose a mesh screen to suit the complexity of the design, and the texture of the fabric being printed. The mesh screen is then coated with a layer of light-reactive emulsion, which will harden when developed under bright light.

Step 3: The emulsion is exposed

The acetate sheet featuring the design is then laid onto the emulsion-coated screen, and the whole thing is exposed to a very bright light. The light hardens the emulsion, so the parts of the screen which are covered by the design remain in liquid form.

If the final design is going to include more than one colour, then a separate screen must be used to apply each layer of ink. To create multi-coloured products, the printer must use his skill to design each stencil, and line them up perfectly to ensure the final design is seamless.

Step 4: The emulsion is washed off, creating the stencil

After the screen has been exposed for a set time, the areas of the screen not covered by the design will have turned hard. Any unhardened emulsion is then carefully rinsed away. This leaves a clear imprint of the design on the screen for the ink to pass through.

The screen is then dried, and the printer will make any necessary touch-ups or corrections to make the imprint as accurate as possible to the original design. The stencil is now ready to be used.

Step 5: The Item Is Prepared For Print

The screen is then placed on the printing press. The item or garment being printed is laid down flat onto the printing board, underneath the screen.

There are a number of different presses, including manual and automatic styles, but most modern commercial printers will use an automatic rotary carousel printer, as this allows several different screens to work at once. For multicoloured prints, this sort of printer can also be used to apply the separate colour layers in quick succession.

Step 6: The ink is pressed through the screen onto the item

The screen is lowered down onto the printing board. Ink is added to the top end of the screen, and a squeegee is used to pull the ink along the full length of the screen. This presses the ink through the open areas of the stencil, imprinting the design on the product underneath.

If the printer is creating multiple items, then the screen is raised and a new garment is placed onto the printing board. The process is then repeated.

Once all the items have been printed and the stencil has served its purpose, the emulsion is removed using a special washing fluid so the mesh can be reused to create new stencils.

Step 7: The product is dried, checked and finished

The printed product then passes through a dryer, which cures the ink and creates a smooth, colourfast finish. The final product will be checked and washed thoroughly to remove any residue, before being passed on to its new owner