Instructions for Use

Project Planning

• Discuss each project with your suppliers and ask for their recommended products.
• Avoid the following pigments if applying an aqueous coating because the color may burn out: red-lake C, warm red, reflex blue, purple, violet, rhodamines. Your ink supplier can provide substitute pigments that will be more stable.
• Compensate for 4 – 7% more dot gain, between the quarter and three-quarter tone, than on coated papers.
• Use Under Color Removal (UCR) and Grey Component Replacement (GCR) whenever possible.
• Avoid Total Area Coverage (TAC) greater than 300% if possible.
• Your fountain solution chemistry may not necessarily be compatible for printing oxidizing inks on a synthetic stock, therefore, contact your supplier and confirm its compatibility.

Press Conditions and Setup

• Allow YUPO to acclimate to press room conditions for at least 24 hours before unwrapping, and even longer during the winter.
• To avoid static, maintain at least 42% relative humidity. Also, use anti-static equipment such as tinsel, static string, static bars, etc. at the feeder and/or delivery.
• If running a product less than 6mils thickness, it is recommended to repalletize or provide additional fanning to reduce blocking.
• To avoid marking, minimize pressure of suckers and feeder-board wheels/brushes.
• Dry dust on any available open units to remove filler dust from the surface of the sheet.
• Set aside delivery boards to be able to rack jobs on 4-inch lifts.
• Use metal plates that carry minimal water. Do not use paper or polyester plates.
• For most jobs, use 24 to 35 micron particle size spray powder.
• Do not use encapsulated spray powder.

Press Setup, Inks and Production

• If YUPO will be combined with other printed substrates, print the entire job with inks formulated for YUPO.
• Pre-test with samples of YUPO using the intended: design, inks, coatings, varnishes, adhesives, laminations, binding methods, and finishing techniques. Dummies should be tested under end use conditions.
• Run speed is typically no more than 7,000 impressions per hour.
• Use the thinnest ink, coating, varnish—film-thickness. Solid ink density targets: K-1.65; C&M-1.30; Y-0.95
• The side of the form with the lighter ink coverage should be printed first.
• Add dryer (Grafo, Speedy Dry, etc.) to the ink, (high solid ink made for YUPO) particularly with forms having light ink coverage, and use take-off bars to prevent over-emulsification.
• 5% for K and 3% for C,M&Y is a starting point for added dryers.

Fountain Solution

• For best results, use a freshly mixed alcohol-based fountain solution. Alcohol substitutes may be used.
• Avoid etches or substitutes that contain high percentages of glycerin because they retard drying. Please contact your supplier for recommendations. Do not use fountain solution stimulator driers.
• Maintain fountain solutions between 4.5 – 5.5pH (target is 5.0, however above 4.0 is required).

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Press Maintenance

• Wash blankets to remove filler-dust, typically 2,000 to 3,000 sheets, or as ink density decreases in the shadow-tones.

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Drying & Finishing

• Plan for at least 24 hours of dry time between printing first side and second side on any two-sided jobs or before conducting any finishing operations.
• Wind the loads soon after the ink sets.
• If backing up, avoid using drying agents on the first side printed, or wind quickly after the inks set.
• If using an aqueous coating, wind the loads within one hour after printing and again within four hours.