Photopolymer emulsion is a type of photo emulsion that contains a photosensitive resin. Types of Photo Emulsion Liquids: Photopolymer Emulsion The exposure time will vary depending on the strength of the light and the type of photo emulsion you are using. Make sure that the light you are using is bright enough.Do not try to expose it before it has dried completely, or the image will not be clear. Allow the emulsion to dry completely before exposing it to light.However, a light coat will ensure that the image is clear and sharp. You do not need to apply a lot of emulsion to the screen to get good results. Apply a thin coat of emulsion to the screen.A foam brush or a squeegee is the best tool for applying the emulsion to the screen. Make sure to do your research before purchasing an emulsion. There are many different types of emulsion available, and not all of them will work well for silk screening. You can clean the screen with a degreaser or soap and water. The emulsion will not adhere to the screen if it is dirty. Ensure that your emulsion screen print is completely clean and free of any debris or oils.The following are some tips on how to coat your screen with emulsion effectively: In this article, we will discuss how to get started using photo emulsion and some tips on how to use it effectively. This stencil can then print images on fabric or other materials. This is because the areas that are hit by light will harden, while those that are not hit by light will stay soft. Photo emulsion screen print is a great way to add detail and life to your prints. The photo emulsion is coated onto the screen and then exposed to light. Photo emulsion is a substance used to create a stencil on a screen. Use Haze Remover 5230 to remove ink and haze residues, if necessary.Information on different styles on photo emulsion screen printing, and answers to commonly asked questions. Wash the screen with a forceful spray of water. Do not let the stencil remover dry on the screen. Screen Systems Biodegradable solvent 2500 or 2550 will remove almost all inks. STENCIL REMOVAL: Remove ink from the screen using a solvent. Use Speedball blockout thinned with equal parts water and apply with a spotting brush. Touchup Use excess emulsion and re-expose the screen. Apply Speedball blockout with a plastic applicator squeegee or 14 ply cardboard. Blot excess water from the printing side with unprinted newspaper stock.īLOCKOUT / TOUCHUP: Blockout Before drying and exposure, use excess emulsion from the coating step to cover the blockout area. Rinse both sides with a gentle spray until no soft emulsion is left on the squeegee side, and no foam or bubbles remain. Then spray the printing side forcefully until the image areas clear. WASHOUT: Wet both sides of the screen with a gentle spray of cold water. The optimum exposure is when the emulsion first reaches its maximum color density, and the edges of the positive do not "resolve." The squeegee side emulsion is hard, not soft or slimy. Use a dehumidifier in the drying area is strongly recommended, if possible.ĭETERMINE OPTIMAL EXPOSING TIME: Make a Step Wedge or use an Exposure Calculator Kit carried through to actual printing to determine your optimum exposure time. Under humid conditions, dry the coated screen with warm, filtered air up to 104° F. Additional coats can be applied to the print side to optimize definition.ĭRY THE SCREEN: Dry screens thoroughly in a horizontal position, printing side down, at room temperature in a dirt- and dust-free area. After each coating, rotate the screen 180°. Method 2: Apply two coats on the printing side, then two coats on the squeegee side, wet-on-wet. Apply one coat of emulsion to the printing side, then one coat on the squeegee side. The coater should be at least two inches shorter that the narrow width of your screen. Wait at least one hour for the emulsion to de-bubble.ĬOAT THE SCREEN: Use the rounded edge of a scoop coater to apply an even coat of emulsion in one pass. Stir with a clean, broad, flat plastic or stainless steel instrument until the emulsion is uniform in color. Pour the fully dissolved sensitizer into the emulsion. Dissolve the diazo sensitizer powder by adding lukewarm water up to the shoulder of the bottle. SENSITIZE THE EMULSION:Handle under yellow light. It increases the surface area of fabric for a better mechanical bond of the stencil, increasing printing run length. (Mechanical roughening is an option for new fabric that is not surface treated. This kit enables one to try diret emulsion for a low cost.įABRIC PREPERATION: Used or surface treated fabric need only be degreased using Screen Systems Degreaser 5505. The Speedball Emulsion kit contains an 7 oz bottle of emulsion, an 8 oz bottle of emulsion remover, and a bottle of sensitizer.
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