![]() For Dual Cure emulsions you are looking for a step seven and on photopolymer emulsions a step five to six for full exposure when using a 21-step wedge. You can check this by conducting multiple exposure checks across the glass to see if there are differences in exposure between and directly over the LEDs.Īlways remember to check exposure times using a 21-step wedge or and exposure calculator. This means that you can have areas of the emulsion that are exposed fully and others that are under exposed and cause defuse shadows. Columnated vs multi light source (uncolumnated) and how this can affect undercutting during exposure If the LEDs are two wide apart this can cause areas that are not fully exposed, especially as LED’s provide a more collimated light source and there will be less crossover of the light. The space between the LEDs and the distance that the LEDs are positioned from the glass can have an impact on the exposure of an emulsion. Weakness and pin holing in the stencil during printing Throughout this year I have been called into many screen printers in the UK that have moved away from conventional exposure systems and added LED exposure to their screen making process and have subsequently experienced technical difficulties with their emulsions during the processing, printing or reclaiming stages and various causes have been identified. LED exposing also offers longer life cycles in comparison to conventional systems such as UV tubes (one year) or metal halide (three months when not using an integrator) exposure system, whereas LED have a working life of 10,000 to 50,000 hours depending on the source of the LEDs. ![]() William Shorter, of SPT Sales + Marketing, dives head first into this trend.ĭriving this trend in the market, is the desire for exposure systems that are less energy intensive, give faster exposure times and achieve a better fine line detail. Use Easiway Supra for use with a dip tank only.LED exposure systems is a continuing trend in the screen printing market, especially for screen printers that are involved in textile screen printing. Use Franmar Strip-E-Doo or Easiway 500 to remove this emulsion. As always, these time and temperatures are guidelines, many aspects can affect the exposure times. If stored in its original container at a temperature between 15 and 25☌ this product will preserve its characteristics for at least 1 year from the date of production, then once mixed it will preserve for 6-8 weeks from mixing. Our suggestion: Lighting halogen: 5000W Application: 1-2 internal coats, 1-2 external coats Mesh 120T white 60 sec. To determine the correct exposure time, we suggest you conduct some tests with an exposure calculator. Lamp type, distance from lamp to screen, mesh type and coating thickness can affect exposure time. We advise that you dry the screen horizontally in a ventilated drying cabinet, at 30-40☌ for 40-60 minutes depending on the coating thickness. As a general indication, we suggest you apply 1 or 2 coats of emulsion on the external face of the screen and 1 or 2 coats on the internal face, wet on wet, then a final dry coat on the inside of the screen to push the emulsion to the back of the screen. We recommend you always degrease the mesh. Since it is a polymer emulsion we recommend you work in an area with low to little light, not under a direct light or in sunlight. Next, mix the whole dose with SCREEN-SOL QV, stir well and then let it settle for approximately 2 hours to eliminate air bubbles or overnight would be preferred. Screen Chem Catalyst – (makes emulsion permanent)Īdd a small amount of water to diazo-sensitiser and shake well. ![]() High resistance to inks (plastisol, waterbased and solvent).The emulsion includes the required sensitiser and works well for beginners and advanced printers.Ĭheck out this blog post to see which emulsion is best for you Sensitize with diazo, add a small amount of water to the bottle with diazo in in order to dissolve the powder. Suitable to work with any kind of light source. It very good resistance to both plastisol and waterbased inks. High definition for screens up to 120T/305. This is also a dual-cure photo emulsion for plastisol ink. Spot Cleaning Solutions and Accessories.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |