ISO 14968 pdf download

ISO 14968 pdf download.Paper and board — Cut-size office paper — Measurement of curl in a pack of sheets 1 Scope This International Standard specifies a method for the measurement of curl in cut-size office papers. The test method would typically be used in evaluating papers of the type described in ISO 216. This method is limited to papers with a maximum dimension of 300 mm in both directions. The measurement may be made on papers as received, after conditioning, or after processing in a copier or printing device. 2 Normative references The following standards contains provisions which, through reference in the text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 186:1994, Paper and Board — Sampling to determine average quality . ISO 187:1990, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples . ISO 21 6:— 1 ) , Writing paper and certain classes of printed matter — Trimmed sizes — A and B series. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 curl deviation from a flat surface which has three major components: magnitude, direction of curl axis and the side towards which the paper curls 3.1.1 curl magnitude quantitative measure of the deviation of a paper test piece from a flat surface NOTE 1 It is expressed as the reciprocal of the radius of curvature, R, of the curled test piece with units of reciprocal metres (m −1 ). NOTE 2 The radius of curvature for the curled test piece is the distance from the arc to the centre of a circle, of which the arc forms a part. The reciprocal radius ( R −1 ) has a value of zero for a flat sheet. NOTE 3 Curl characteristics of paper and board are time-dependent and the magnitude of any curl may be transient. 3.1.2 curl axis direction direction of the curl axis of paper and board, characterized as follows: – curl axis which is perpendicular to the paper’s machine direction; – curl axis which is...