Printwear

Recognized Supplier Guide ‘18

For the Business of Apparel Decorating

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60 || P RI N T W E A R O C T O B E R 2 01 8 Use the color syste m as it was intended with color creation strategies based on the para meter needed. E N E M Y: L O O S E A N D/ O R I N C O N SI S T E N T S C R E E N S This self-in icted proble m creates many s mall hidden proble ms on-press. When a screen doesn't have adequate ten - sion, it will often result in an adequate but not great result. This is a result of a multi- tude of s mall adjust ments that need to be made on-press in order to get an "accept - able" result. With loose screens, the follo wing will occur: 1) The inability to clear the screen with lo w pressure. The printer will need more force and slo wer stroke to allo w the ink to clear and the screen to lift a way fro m the shirt. 2) Mesh has less open area. Since the screen is not tightened, the actual mesh count see ms higher due to re - laxed mesh. 3) Forces higher off-contact. To recreate a si mulation of a screen with decent tension, the printer may increase the off-contact to allo w the mesh to lift a way fro m the shirt. This will require added pressure, which in turn increas- es ink usage and excessive dot gain. 4) If one screen is looser than others on sa me job, the registration will suffer due to i mage elongation. The exces- sive pressure, off-contact, and loose mesh creates the situation where one of the colors may see m to be registered on the top and out of registration on the botto m. The i mage is actually dis- torting because the screen is giving in and stretched under the pressure. 5) " Orange peel" or " mottling." This is a result of a printer not adjusting the off-contact as the loose screen will re- main in contact with the shirt until the screen is lifted. This will result in an uneven pattern of ink on the surface. Relatively tight screens (above 20) and consistent tensions on multicolor jobs will allo w the printer to use lo wer off- contact with less pressure and more pre- dictable results. E N E M Y: T O O M U C H H E AT O N- P R E S S It is i mportant to understand the ashing and curing criteria of an ink. If ash units aren't calibrated to the gel te mperature, it can cause multiple production killing proble ms. These sy mpto ms include: 1) Tacky ink if the ash unit causes the surface of the ink to reach re melt te m- perature. This will cause the shirt to FI G HT T HE E N E MI E S O F G O O D P RI N T S Loose screens will require more off contact to allo w the mesh to lift a way fro m the shirt. This will require added squeegee pressure, which in turn increases ink usage and excessive dot gain. Relatively tight screens (above 20) and consistent tensions on multi-color jobs will allo w the printer to use lo wer off-contact with less pressure and predictable results. HOW TO

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