This International Standard specifies two methods of measur-ing the thicknes of paper and board and of calculating the ap-parent bulk density or the apparent sheet density from the thickness determinations. The methods are a) measurement of single sheets of paper or board (single sheet thickness); b) measurement of a pack of sheets of paper of grammage up to 224 g/m2 (bulking thickness). These methods are not applicable to corrugated fibreboard and, in the case of method b), not to certain soft papers such as tissues which are creped and/or embossed, due to the slow or excessive compression which takes place when measurements are made on such materials. It should be noted that two alternative pressures are permitted (see table 1); the pressure of 100 kPa ± 10 kPa is preferred. NOTE — It should be noted that the two methods generally lead to dif-ferent results.
DS/EN 20534-1993由丹麦标准化协会 DK-DS 发布于 1993-12-01,并于 1993-12-01 实施。
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