Screen Colour Systems have a range of screen emulsions and a hand cutting film to produce a screen stencil. See below for a full description of their resistances and mesh requirements. We also stock coating troughs up to 2 metre in length. we can also make custom sizes to meet your requirements. to aid getting the correct exposure times we stock an exposure calculator.
Easy Coat is a Diazo sensitised dual-cure general purpose photo-emulsion. It has 39% solids content and medium viscosity. You can achieve good definition and excellent durability with this emulsion. Easy Coat has excellent resistance to water based products. This emulsion is also resistant to Solvent and UV inks. The emulsion is suitable for mesh counts 21 to 120. Wash up with soapy water, white spirit or General Purpose Cleaner depending on the ink used. The surprising feature of this water resistant emulsion is the ease of reclaim when correctly exposed. The use of strong solvents during wash up may make reclaim harder. Easy Coat has a 10 to 12 months shelf life unsensitised, once the sensitiser is mixed the shelf life will be 1 month, keeping it refrigerated (not frozen) will extend the shelf life even further. For the best results use an exposure calculator to determine the correct lamp settings.
Matt Coat is a Diazo Sensitised Photo-Emulsion. It has 38% solids content and a medium viscosity. It has both excellent definition and durability. Matt Coat is resistant to Solvent and Plastisol. The emulsion is suited to mesh counts 49 to 165. Wash up with white spirit or General Purpose Cleaner depending on the ink used. This emulsion has a matt finish which makes it ideal for printing shiny material and soft PVC. Matt Coat has a 10 to 12 months shelf life unsensitised, once the sensitiser is mixed the shelf life will be 1 month, keeping it refrigerated (not frozen) will extend the shelf life even further. For the best results use an exposure calculator to determine the correct lamp settings.
Tuff Coat is a Pre-Polymmer Diazo sensitised photo-emulsion. It has 48% solid content and a high viscosity. It has good edge definition and excellent durability. Tuff Coat is resistant to all types of water based inks including discharge as well as plastisols. This emulsion is suited to mesh counts of 10 to 62. Wash up with soapy water or white spirit depending on the ink used. Tuff Coat is our most durable emulsion with high mechanical resistance. Once the sensitiser is mixed the shelf life will be 1 to 2 months, keeping it refrigerated (not frozen) will extend the shelf life even further. For the best results use an exposure calculator to determine the correct lamp settings.
Multi Coat is a Pure Polymer Emulsion. This emulsion was developed to produce extra thick screen stencils. This emulsion has a very high viscosity. The more coats you apply of the emulsion the thicker the screen stencil will be. We recommend between four and ten coats to give a good hi build to the ink. The emulsion is suited to mesh counts 10 to 43. This emulsion is already sensitised so is ready to use straight away, keeping it refrigerated (not frozen) will extend the shelf life of this product. When exposing the stencil extra time is required and a very good film positive. When you wash out the stencil allow extra time for washing. A medium pressure spray will give the stencil very sharp edges and this will be reproduced in the print. Only wash out from the back of the screen.
This simple piece of plastic can help all screen printers obtain the correct exposure for all their mesh counts and stencil thicknesses. To use the calculator correctly you should coat the screen with the same number of coats you normally use.* This is very important as you must have a consistent coating thickness so all tests use the same coating criteria. The exposure calculator should also be used on all the current mesh counts you use. If you expose for 2 minutes then when you conduct the test you would double the exposure time to 4 minutes(with an integrator you would double the units used for the exposure). You place the Exposure Calculator in the same position as you would your normal positive. When the screen is exposed, washout in the normal way. You now need to dry the screen. The stencil should now display various shades. Start from the lightest section working towards the section that has no colour change. The first section with no colour change is the correct exposure. You then multiply by the factor on that section the time or units you exposed for. If all sections show a colour change then you have under exposed the screen. You will need to double the exposure time and repeat the test.*N.B. if you use different thickness of stencils for different jobs you should conduct the test separately for each one.
We make many sizes of coating trough. Our troughs are made from extruded Aluminium. The special moulded edge allows for the correct depth of emulsion to be applied to the mesh. The emulsion depth is achieved by applying multiple strokes on the squeegee side of the frame. We can supply lengths of coating trough which you can cut to size and clip on the ends. This trough has a large capacity for emulsion making coating large frames easier and quicker.