Dimensional instability will result in mis-registration in the press. High roughness of the paper results in more consumption and many other printability defects, too.Ī measure of the extent to which a paper will resist a change in size as the result of a change in moisture content. Higher bulk of the same GSM will reduce the show through defects.Ī degree of peaks and valleys on the surface of the paper. Not only is consistent thickness required in web offset lithography, where varying bulk within a single roll can cause the roll to unwind with uneven tension, which is responsible for various printing defects as well as web breaks. Thickness of the paper in relation with GSM. An abrupt increase or decrease in caliper can affect the extent to which the printing plate or blanket contacts the paper and transfers a complete printed image, as well as other printability and runability issues. Consistency of caliper throughout the paper web is an important consideration. The mean of the weights is used to calculate the mass of the paper per square meter, and the standard deviation is determined from all samples.ĭefines the thickness of the paper. (Mass is usually measured as weight at a location with sea-level gravity.) Paper sheets are cut to a size of 10 cm × 10 cm, then the sheets are weighed individually. The mass per area of the paper is measured as GSM (grams per square meter). Major paper properties are widely classified into four categories. Some of the important paper and ink tests are listed here:Ī wide variety of paper tests are available, depending on the specific needs and on the governing contract or specification.
They are necessary to balance print quality, cost, and wear on the press. ( Learn how and when to remove this template message)Ī variety of tests are used to determine ink and paper and paperboard quality, and to measure their interactions. JSTOR ( March 2017) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Paper and ink testing" – news
Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
0 kommentar(er)
