3/19/2023 0 Comments Caliper covers![]() ![]() The standard dimensions and sheet count of a ream vary according to the type of paper. the dimensions of an "uncut" sheet in that ream.So, to compute the mass per area, one must know Often, that is a size used during the manufacturing process before the paper is cut to the dimensions in which it is sold. Instead, it is the mass of the uncut "basis ream" in which the sheets have some larger size (parent size). However, the mass specified is not the mass of the ream that is sold to the customer. In the US system, the weight is specified in avoirdupois pounds and the sheet count of a paper ream is usually 500 sheets. The basis weight of paper is the density of paper expressed in terms of the mass of a ream of given dimensions and a sheet count. In countries that use American paper sizes, a less verifiable measure known as basis weight is used in addition to or instead of grammage. Typically grammage is measured in paper mill on-line by a quality control system and verified by laboratory measurement. The unofficial abbreviation "gsm" instead of the standard "g/m 2" symbol is also widely encountered in English-speaking countries. ![]() Typical office paper has 80 g/m 2 (0.26 oz/sq ft), therefore a typical A4 sheet ( 1⁄ 16 of a square metre) weighs 5 g (0.18 oz). Grammage = mass (g) length ( m ) × width ( m ) This quantity is commonly called grammage in both English and French, though printers in most English-speaking countries still refer to the " weight" of paper. In the metric system, the mass per unit area of all types of paper and paperboard is expressed in terms of grams per square meter (g/m 2 or gsm). ![]()
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