How Screen Printers Replicate Images | Computers and Technology

Usually when an individual wants to replicate an image, they either scan the image and print out copies using a personal printer or a copy machine, but these types of printers are limited. If you want to print anything larger than an 8 x 11 sheet of paper, you?re out of luck. Fortunately, there are screen printers that can recreate images as large as you?d like. Without screen printers in Albany, or similar processes, many of the restaurant and store logos you see driving down the street wouldn?t be so perfect. Screen printing is a fairly simple process that makes replicating an image of any size possible.

A screen printing job starts with a frame, usually made of wood. This frame needs to be as large or larger than the image you plan on printing. Once the frame is made, a mesh fabric is stretched over it, and attached. This fabric is porous, meaning it will let liquids, like ink, run through it. The edges of the frame are taped to make sure no excess ink runs through.

A stencil, which is a negative copy of the image you wish to replicate, now needs to be created. Even though you may be making thousands of replications, for a single layer, single color image you only need one stencil. A stencil by tracing an image, and cutting out the shape. This is the simplest method, but also the most difficult.

A more preferred method is the photographic method. In a darkened room with safe lights, a thin even coat of photosensitive emulsion is applied evenly to the screen. Then, a transparency with the image area darkened is placed on the screen and exposed to light. The emulsion that is exposed to the light will harden, while the parts protected by the image will remain soft. Afterward, the screen is washed with a high-pressured hose, which washes away only the parts of the image you wish to print.

Once you have your stencil, you?re ready to begin printing. To print, the paper or other material you want to print on is placed under the frame. Inc is poured along one side of the stencil, and a squeegee is used to pull the ink evenly across the stencil. From there, you can remove the finished print, put in a new printable surface, and make another copy immediately.

Expanding on the technique for a single color technique, printers can create multicolored prints by making a separate stencil for each color, and applying the colors one at a time.

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Source: http://www.meetcoco.com/how-screen-printers-replicate-images/

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