{"id":310,"date":"2022-11-18T22:22:15","date_gmt":"2022-11-18T22:22:15","guid":{"rendered":"http:\/\/www.unigraphinternational.ca\/?post_type=unigraph_soutien&p=310"},"modified":"2022-11-22T13:28:07","modified_gmt":"2022-11-22T13:28:07","slug":"drying-too-slow","status":"publish","type":"unigraph_soutien","link":"https:\/\/www.unigraphinternational.com\/en\/soutien\/drying-too-slow\/","title":{"rendered":"Drying too slow"},"content":{"rendered":"

TROUBLESHOOTING FOR SHEETFED AND WEB PRESSES<\/h4>\n

Drying too slow : Ink remains tacky during press delivery and bindery operations, resulting in set-off, marking or blocking.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Causes<\/th>\nRemedies<\/th>\n<\/tr>\n
pH\/conductivity of fountain solution incorrect.<\/td>\nDrain circulation tank and make a fresh mix with correct amounts of etch and alcohol\/ alcohol substitutes.<\/td>\n<\/tr>\n
Stock has too high of a moisture content.<\/td>\nSubstitute stock with one that has a correct moisture content. Allow stock to acclimatize.<\/td>\n<\/tr>\n
Too much ink needed on sheet to obtain colour.<\/td>\nUse a higher pigmented ink or consider a UCR separation.<\/td>\n<\/tr>\n
Wrong ink being used for substrate being printed on.<\/td>\nCheck with manufacturer for correct ink. Inks with high vegetable oil content never dry hard.<\/td>\n<\/tr>\n
Dryer temperature too low for speed of web. Insufficient solvent being released from ink film.<\/td>\nIncrease dryer temperature to specification level.<\/td>\n<\/tr>\n
Ink film thickness excessive.<\/td>\nRun less ink or consult ink manufacturer to increase strengths for this purpose.<\/td>\n<\/tr>\n
Inadequate evacuation of solvent vapours clinging to web as it leaves dryer.<\/td>\nIncrease velocity of air in air-knife scavenger at dryer exit.<\/td>\n<\/tr>\n
Chill system not working properly \u2013 ink resins are not setting hard enough.<\/td>\nLower chill-roll temperature. (Caution: Watch for chill-roll condensation.)<\/td>\n<\/tr>\n
Ink takes on too much water.<\/td>\nConsult ink manufacturer for proper adjustment.<\/td>\n<\/tr>\n
Plate dampening is uneven.<\/td>\nKeep dampeners clean and free from accumulated dirt. Prevent drafts, check windows, vents and forced-air systems.<\/td>\n<\/tr>\n
Ink film is only surface-dried in oven and still wet underneath. After chilling, ink solvent will work its way towards surface causing set-off. Most likely to occur with heavier-than-normal ink film thickness or very non-absorbent stocks.<\/td>\nReduce speed of press. Adjust oven temperature.<\/td>\n<\/tr>\n
Ink films do not dry at normal dryer temperatures<\/td>\nConsult ink manufacturer for inks that dry at lower temperatures.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

TROUBLESHOOTING FOR SHEETFED AND WEB PRESSES Drying too slow : Ink remains tacky during press delivery and bindery operations, resulting in set-off, marking or blocking. Causes Remedies pH\/conductivity of fountain solution incorrect. Drain circulation tank and make a fresh mix with correct amounts of etch and alcohol\/ alcohol substitutes. Stock has too high of a […]<\/p>\n","protected":false},"template":"","unigraph_category_soutien":[33],"class_list":["post-310","unigraph_soutien","type-unigraph_soutien","status-publish","hentry","unigraph_category_soutien-troubleshooting"],"acf":[],"yoast_head":"\nDrying too slow - Unigraph international<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.unigraphinternational.com\/en\/soutien\/drying-too-slow\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drying too slow - Unigraph international\" \/>\n<meta property=\"og:description\" content=\"TROUBLESHOOTING FOR SHEETFED AND WEB PRESSES Drying too slow : Ink remains tacky during press delivery and bindery operations, resulting in set-off, marking or blocking. Causes Remedies pH\/conductivity of fountain solution incorrect. Drain circulation tank and make a fresh mix with correct amounts of etch and alcohol\/ alcohol substitutes. 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Causes Remedies pH\/conductivity of fountain solution incorrect. Drain circulation tank and make a fresh mix with correct amounts of etch and alcohol\/ alcohol substitutes. 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