How to make screen printing on T-shirts?

The printing method known as silk screen or serigraphy has been in use for over a century and is prevalent across various industries globally. 

In fact, more than half of all silkscreen activities are dedicated to commercial clothing applications. The silk screen process involves layering several stencil designs onto screens before transferring the prints one layer at a time. Ink is applied using rollers or squeegees, and then exposed to heat or light to ensure that each color is securely set into the fabric. The choice of printing press depends on budget considerations and other factors.
The influence of screen printing on the fashion and textile sectors has been profound, allowing for the creation of vibrant and intricate patterns on fabrics, including silk.

This method comes with several benefits: it ensures precision in capturing fine details, allows printing on a diverse range of fabric types, and offers flexibility due to the variety of inks and multiple colors that can be utilized.

However, a significant drawback of screen printing in the fashion and textile industries is the requirement to meet minimum order quantities—typically around 200 meters per color—which can be challenging for designs that require multiple colors.

Every screen printer has a distinct journey that led them to this craft. Some aspired to launch their own apparel brand, while others discovered it as a viable means of earning a living. Regardless of your motivation, mastering screen printing is a comprehensive process. Here’s a straightforward guide to help you navigate the essential steps for screen printing t-shirts.

Imagine a design that says "your brand starts here" in vibrant blue, pink, yellow, and white, displayed on both black and white shirts side by side, created in Adobe Illustrator.

ARTWORK PREPARATION Before you can print a t-shirt, you need a design to print on it. Whether you create the artwork yourself or receive it from a client, every screen printing project begins with some form of visual design. When considering the artwork for your t-shirts, keep in mind the principle that poor quality input results in poor quality output. Essentially, the higher the quality of the artwork you start with, the superior the final screen print will be. In the screen printing process, each color is printed separately. If your design includes multiple colors, you’ll need to separate them to create individual screens for each color. Remember, each color requires its own screen.
Many screen printers rely on software like Illustrator, Photoshop, or Procreate to fulfill their artistic requirements. These applications assist in organizing and refining artwork to ensure it’s ready for the printing process.

At times, you might need some assistance in crafting your design. You can find brushes, texture packs, fonts, and themed collections like skull packs to help enhance your next creative project.

PRINTING FILM POSITIVES After finalizing the artwork and separating the colors, the subsequent step is to produce a film positive. A film positive transparency functions similarly to an overhead transparency sheet. This film positive will be utilized to transfer the image onto a silk screen. For the design you intend to print on the t-shirt, you will print it in solid black ink on the film positive.

There are numerous methods to create film positives. You might choose to hire a local printing service, manually draw your design onto the film, or invest in a compatible printer for home or workshop use.

PREPARING THE SCREEN FOR EXPOSURE
After you have produced the film positives, the next step is to prepare the screen. A screen printing frame typically consists of either a wooden or aluminum frame that is fitted with polyester mesh. This mesh is crucial as it holds the image in place and allows ink to flow through when you apply pressure with a squeegee. To transfer your design onto the screen, you must first apply emulsion to the mesh. Prior to applying the emulsion, it’s essential to clean the mesh using a specialized screen printing degreaser. This step ensures that any dust, lint, or other particles are removed, preventing any imperfections such as bumps or pinholes in your emulsion layer.

Emulsion is sensitive to light, so the process of coating the screen is usually performed in a dark environment equipped with special yellow light bulbs that are safe for this purpose. Once the screen has been coated and allowed to dry, the next step is to position the film positive carefully onto the screen. It is then exposed using a screen printing exposure unit or a specialized exposure light bulb for a specific duration. The emulsion on the screen hardens when exposed to light, while the black areas of the film positive block the light from reaching the emulsion underneath. This results in the emulsion remaining unexposed or soft in those areas. After the exposure process is complete, the screen is rinsed with water. The unexposed, softer emulsion washes away, leaving the mesh open in the shapes of your design.

Print with a Kit: 250 Edition provides screen printers with comprehensive guidance on the techniques for coating screens and ensuring they dry correctly to maximize printing quality.

A hand is positioned on a vibrant red shirt placed on a screen printing press.

SETTING UP THE SCREEN PRINTING PRESS

Before diving into the process of printing t-shirts, it's essential to properly configure the screens on your screen printing press. A screen printing press is made up of a base that supports printing platens and multiple color arms. A manual press can range from a compact 1 color 1 station setup to an expansive 8 color 6 station configuration. Naturally, having additional color arms allows for printing multiple colors simultaneously. Similarly, a greater number of printing stations enables you to produce more shirts in a shorter amount of time.

When working on a multi-color project, it’s essential to align the colors accurately so they match up correctly when printed on the shirt. Utilizing a press equipped with a laser guiding system or micro-registration features can be extremely beneficial for achieving precise detail and multi-color prints. After you believe your screens are aligned, it’s crucial to perform a test print to verify that everything is properly lined up.

PRINTING YOUR SHIRTS
Before you begin loading the shirt onto the platen, it’s important to apply pallet adhesive to the platen surface. This adhesive ensures that the shirt adheres securely to the platen, preventing any movement during the printing process. Once the adhesive is applied, position your shirt onto the press and align the print head accordingly.

Before securing the print head in place above the shirt, be sure to flood the screen with ink first. This step is crucial for ensuring an even distribution of ink. After locking the print head down, you can then push or pull the screen printing ink across the mesh to transfer the ink onto the shirt. Depending on the desired opacity, you might need to make multiple passes to achieve the right amount of ink coverage. If your design involves multiple colors, repeat these steps for each of your screens. For a comprehensive introduction to t-shirt printing, consider enrolling in this free course.

You also need to cure the print after you finish printing the shirt. Curing refers to the process of drying and setting the ink into the fabric. You can cure a shirt using either a conveyor dryer or a flash dryer. The specific temperature required for curing the ink can vary, so it’s important to check the instructions on the ink container to find the correct curing temperature. If a shirt isn’t cured properly, the ink won’t hold up over time, and the print may begin to deteriorate. To verify that a print has been adequately cured, you can conduct a stretch test and a wash test. Additionally, using a laser temperature gun or a donut probe will help you check the temperature of the ink.

Advantages of Screen Printing

Screen printing is a preferred option for numerous projects because of its superior color quality, often exceeding that of digital printing. It is particularly efficient for large-scale production runs, as the printing board and stencil allow for easy replication of designs without incurring additional costs or efforts. Furthermore, its adaptability to a wide variety of materials makes screen printing highly versatile and appealing overall.

Drawbacks of Screen Printing

Despite its many benefits, screen printing does come with certain limitations. One significant drawback is the challenge of producing intricate and detailed designs due to the restrictions on the number of colors that can be used in a single print. Additionally, the process can be quite labor-intensive, involving multiple stages that may take several hours or even days to complete, depending on the complexity of the design. This makes screen printing less suitable for projects requiring quick turnaround times or smaller production quantities.

This is just the beginning. We could explore in detail the purposes of different mesh counts, the right emulsion to use, how to troubleshoot emulsion application problems, the variations in squeegee durometer, which manual press suits your needs best, the applications of plastisol versus water-based inks, curing techniques and tips, shop organization, and much more. Screen printing is a multifaceted art form that can be both challenging and rewarding. The beauty of screen printing lies in the continuous learning process as you evolve in your craft.

FAQ：

How is screen printing performed?

Screen printing involves creating a stencil for the desired image, where specific areas are treated to harden while others remain soft. Once the film is removed, the soft sections can be washed away with water, allowing ink to be applied using a squeegee onto the screen, which is then transferred onto the chosen material for printing.

Which method is superior: screen printing or sublimation?

For large-scale production, screen printing is generally more effective on cotton fabrics. Although sublimation may take longer, it yields more vibrant and vivid colors, especially on polyester blends with high synthetic fiber content or on light-colored fabrics with a polymer coating.

What distinguishes screen printing from digital printing?

Screen printing utilizes a stencil to transfer ink onto the printing surface, while digital printing bypasses the need for a separate stencil, directly applying ink onto the material being printed.

What are some non-textile uses for screen printing?

Screen printing is an efficient method for creating items such as labels, artwork, stickers, and home decor that are designed for durability. This technique is widely employed across various industries to produce cost-effective outputs that stand the test of time.