What Are the Steps of Screen Printing?Screen printing is a popular printing method that's done in a few easy steps:• Step One: Your design is put on a screen.• Step Two: Thick green goo called emulsion is spread over the screen.• Step Three: Before the emulsion hardens, a machine goes over it with UV-shielding ink.• Step Four: The emulsion hardens and a negative image is displayed.• Step Five: Colored ink is spread over the screen and applied via a printing machine.• Step Six: The screen-printed item is ready to go!The reason that it's called "screen printing" is because it involves the use of screens, which we hope isn't that surprising. It would be great if manufacturers had giant pens they could use to draw a company's logo in puffy ink on their items, but until they do (and until they make enough to handle a giant production like five thousand t-shirts), manufacturers need a way to force ink onto the item in the shape of a specific design.
One: Your Design Meets The ScreenThe first step in screen printing is to get a custom design onto a screen. This is done by spreading a thick green emulsion over the screen, a bit like melted wax. Standing over the green goop and cackling like a mad scientist, "It's alive... IT'S ALIVE!" is optional.
Two: Get Ultraviolet!Before the emulsion hardens, a machine prints the custom design onto it with UV-shielding ink, which is kind of like sunblock except without the delightful smell of coconut. When the screen and the emulsion are placed under ultraviolet light to dry, the emulsion hardens everywhere except for where the UV-smart ink was applied. The screen gets washed free of any excess emulsion, and finally a negative image of the custom design will be displayed.
Three: Feeling the PressureAfter the transfer process, the screen is placed into a printing machine. A production worker spreads ink in the color of the customer's choosing over the screen. As the items to be customized pass through the printing machine, the colored ink is spread over the design and pushed through the screen (a little bit like baby food being passed through a strainer). Thanks to the hardened emulsion, the ink only passes through the spots where UV-sensitive ink was applied. Lo and behold—a fully decorated promotional item!
Technical TalkOne of the biggest challenges in screen printing multiple items is proper registration. Print registration refers to the alignment of the screen, along with other parts of the equipment. This alignment ensures a design is printed in the same location on every item, every time. This is especially important if your design has two or more colors. If the registration is off on one of the colors, part of your design could overlap or end up completely detached from the rest of the design! And though "Design in Space" might sound like a great idea for a sci-fi TV show, floating colors really don't do much for the look of a logo. So printers often make registration marks to show where the screen or other parts need to be placed.Some items go through additional steps like a heat treatment before the printing process, which helps the screen-printed ink better adhere to the item. And all of them look fantastic!
Alyssa Mertesamertes@qualitylogoproducts.com866-312-5646 x 277Alyssa is the Lead Copywriter at Quality Logo Products. As a promo expert, she's uncovered the world's first custom tote bag, interviewed the guy behind rock band AC/DC's logo, and had a piece published by the Advertising Specialty Institute, a leader in the promotional products industry.