HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 260
Paper Storage Environment, Paper should be stored at or near room temperature.
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Troubleshooting Paper Storage Environment Paper storage and handling is as important as the paper-making process itself. Paper storage environment conditions directly affect the feed operation. Do not purchase more media than you can use in a short time (3 months). Paper stored for long periods may experience damage from heat and moisture extremes. Planning is important to prevent damage to a large supply of paper. Unconverted paper in sealed reams can remain stable for several months before use. Converted papers have more potential for environmental damage, especially if they are not wrapped in a moisture-proof barrier. Maintain paper in a storage environment of 59° to 95°F (15° to 35°C), with a relative humidity of 40% to 60%. • Paper should be stored at or near room temperature. • The air should not be too dry or too humid (due to hygroscopic properties of paper). • The best way to store an opened ream of paper is to re-wrap it tightly in its moisture-proof wrapping. If the printer environment is subject to extremes, unwrap only the amount of paper to be used during the day's operation. D-24 Using Paper