How to store Proofing Paper for optimum results
Proofing paper's primary purpose is to portray the printed image as close as possible to that of the output produced by professional offset or gravure printing presses. Depending on the situation it may be necessary for several people to handle the print while the approvals are being obtained but Proofing Paper is not intended for longevity. Just as though they are talking about climate conditions for a masterpiece most manufacturers will specify the temperatures and humidity that the paper should be stored to maintain peak condition and give a shelf life for optimum use.
As a rough guide a temperature range of 60-77°F and 40-60% Relative Humidity (RH) is ideal. With very dry conditions of less than 30%RH the paper will tend to curl.
It is recommended that the ink receiving side of the paper only be touched by cotton or plastic gloves to keep the paper free of dirt and excessive moisture. While Proofing Paper and printing inks are generally designed to dry instantly this is dependent on the ambient temperature, relative humidity, and the density of the ink coverage. To maintain its quality the Proofing Paper should not be stacked or wound on rolls until the paper is completely dry. A periodic timing test would be a wise precaution. For long term storage the finished proofs should ideally be stored in cool, dark and medium humidity conditions as sunlight and UV rays will cause visible image deterioration within a few days if left unchecked. For proofs to be kept in pristine condition manufacturers recommend that the paper be laminated as soon as the ink is dry. To verify whether the Proofing Paper should be laminated by thermal or cold processes check with the manufacturers' directions as each type is different.
In general the shelf life for Proofing Paper runs from one to two years as specified by manufacturers. This time and the performance of the paper will reduce if the paper is kept at higher temperatures or in higher humidity conditions.
Index of Proofing Paper articles