1、 Reference number ISO 12635:2008(E) ISO 2008INTERNATIONAL STANDARD ISO 12635 Second edition 2008-12-01 Graphic technology Plates for offset printing Dimensions Technologie graphique Plaques pour impression offset Dimensions ISO 12635:2008(E) PDF disclaimer This PDF file may contain embedded typeface
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5、s otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO co
6、pyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights reservedISO 12635:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Term
7、s and definitions. 1 3 Requirements 2 3.1 Measurement conditions . 2 3.2 Plate dimensions 2 3.3 Rectangularity. 3 3.4 Edge waviness for CtP plates 3 3.5 Cutting burrs for CtP plates. 3 3.6 Plate edge straightness for CtP plates. 4 Annex A (informative) Test method for the edge waviness. 5 Annex B (i
8、nformative) Test methods for the height of cutting burrs 7 Annex C (informative) Test method for the plate straightness 9 Bibliography . 11 ISO 12635:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standar
9、ds bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organi
10、zations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in
11、 the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 %
12、of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12635 was prepared by Technical Committee ISO/TC 130, Graphi
13、c technology. This second edition cancels and replaces the first edition (ISO 12635:1996). It has been extensively revised in all sections; requirements for perforations and designations have been deleted. ISO 12635:2008(E) ISO 2008 All rights reserved v Introduction This International Standard stip
14、ulates dimensional properties of printing plates for offset printing. While not all present plate dimensions will conform to this International Standard, the specifications for dimensions serve as an effort to reduce the multitude of possible formats to a reasonable level that simplifies manufacture
15、 and communications between plate, platesetter and press manufacturers, and the printer. In this revision, the requirements for perforations and designations have been deleted. According to recent developments in dimensions of printing plates, especially within the thickness dimension, new thickness
16、 categories have been implemented. Due to the increasing adoption of CtP, additional attributes have been introduced to be applied to plates with these new devices. INTERNATIONAL STANDARD ISO 12635:2008(E) ISO 2008 All rights reserved 1 Graphic technology Plates for offset printing Dimensions 1 Scop
17、e This International Standard specifies the width, length and thickness of metal lithographic printing plates (referred to hereafter as “plates”). For plates to be used in computer to plate (CtP) applications, flatness, edge straightness and burr requirements are also included. These requirements ar
18、e applicable to unprocessed plates. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 cutting burr ridge along the edge of a plate produced by cutting, especially with a blunt knife 2.2 plate width W dimension of a printing plate parallel to th
19、e cylinder axis (clamping edge) 2.3 plate length L dimension of a printing plate in the direction perpendicular to the cylinder axis (clamping edge) 2.4 plate thickness s caliper of a coated plate 2.5 edge waviness degree to which a plate edge conforms to a measurement plane 2.6 plate edge straightn
20、ess maximum deviation of the plate edge parallel to the cylinder axis (clamping edge) from a straight line, drawn from the corners of the plate 2.7 unprocessed plates plates as received from the manufacturer ISO 12635:2008(E) 2 ISO 2008 All rights reserved3 Requirements 3.1 Measurement conditions Me
21、asurements shall be conducted when both measurement equipment and plates have reached a stabilized temperature of 21 C 1 C. 3.2 Plate dimensions Plates for sheet-fed lithographic use may be of any length, L, or width, W, but shall be specified in increments of 5 mm where the last whole number digit
22、is 0 or 5. Plates for web lithographic use may be of any length or width but shall have their width specified in increments of 5 mm where the last whole number digit is 0 or 5 and their length specified in increments of 2 mm where the last whole number digit is 0, 2, 4, 6 or 8. These requirements ar
23、e summarized in Table 1. The tolerances for length and width shall be as shown in Table 1, the measurement conditions of 3.1 shall apply. The preferred thicknesses and their tolerances shall be as shown in Table 2. Table 1 Plate widths, lengths and their tolerances Dimensions in millimetres Process
24、Width W Width tolerance Length L Length tolerance Sheet-fed offset Last digit 0 or 5 W 1 500: 1,0 W W 1 500: 1,5 Last digit 0 or 5 L 1 500: 1,0 L W 1 500: 1,5 Web offset Last digit 0 or 5 W 1 500: 0,8 W W 1 500: 1,5 Last digit 0, 2, 4, 6, or 8 L 1 500: 0,8 L W 1 500: 1,5 NOTE Except where otherwise
25、specified by the plate manufacturer, plates for web offset printing have the machine direction parallel to the length. Table 2 Plate thickness Dimensions in millimetres Preferred thickness Tolerance 0,100 0,120 0,145 0,190 0,230a0,270b0,280c 0,010 0,375 0,480 0,015 aPlates of this thickness are comm
26、only referred to as “class 0,24 mm plates” in Japan. bPlates of this thickness are commonly used in China. cPlates of this thickness are commonly referred to as “class 0,3 mm plates”.ISO 12635:2008(E) ISO 2008 All rights reserved 3 3.3 Rectangularity The length and width tolerances shown in Table 1
27、are based on a perfectly rectangular plate. Figure 1 shows the nominal dimensions of a plate (solid line) together with rectangles corresponding to the maximum and minimum allowed size (dashed lines) based on the tolerances of Table 1. The actual contour of the plate including deviations from rectan
28、gularity shall cover the smaller rectangle at all points but shall not extend beyond the larger rectangle of Figure 1. Key 1 outer tolerance contour, dashed 2 actual plate contour, dotted 3 nominal plate contour, solid 4 inner tolerance contour, dashed L length W width Figure 1 Plate contour with to
29、lerance rectangles 3.4 Edge waviness for CtP plates The plate is placed coated side up on a measurement table, e.g. a polished stone plate, whose upper surface conforms to a horizontal plane to within 0,5 mm. Plate edges with a length of less than 1 200 mm shall have a maximum wave height of 3,0 mm
30、and should have a maximum wave height of 1,5 mm and plate edges with a length of more than 1 200 mm shall have a maximum wave height of 3,0 mm and should have a maximum wave height of 2,5 mm. NOTE 1 Measurement procedures are given in Annex A. NOTE 2 The edge waviness of non-CTP plates should also m
31、eet the requirements of 3.4. 3.5 Cutting burrs for CtP plates Cutting burrs shall not protrude more than 45 m and should not protrude more than 30 m on each side. Burrs shall be measured on each side and edge of the plate. NOTE 1 Measurement procedures are given in Annex B. NOTE 2 Non-CtP plates sho
32、uld also meet the requirements of 3.5. ISO 12635:2008(E) 4 ISO 2008 All rights reserved3.6 Plate edge straightness for CtP plates The plate edge parallel to the cylinder axis (clamping edge) should not deviate from a straight line by more than 200 m in an interval of 1 000 mm. Three measurements are
33、 taken, one from the left corner of the plate, one from the right corner and one 500 mm around the centre of the edge. In case of plate widths of less than 1 000 mm only one measurement is taken between the plate corners. Dimensions in millimetres Key 1 plate aMaximum deviation of 200 m. Figure 2 Pl
34、ate edge straightness The plate edge shall not be damaged in any way. NOTE Measurement procedures are given in Annex C. ISO 12635:2008(E) ISO 2008 All rights reserved 5 Annex A (informative) Test method for edge waviness A.1 Apparatus A.1.1 Rectangular metal or stone table, with less than 0,5 mm pla
35、narity deviation of size that exceeds that of the largest plate to be evaluated. A.1.2 Taper gauge, with a thickness range from 0,5 mm to 3,5 mm or height measurement apparatus according to B.1 or B.2. A.2 Procedure A.2.1 Place the entire plate on the table (A.1.1), coated side up. A.2.2 Determine t
36、he height of the lowest parts of the plate surface above the table surface at points where the plate is in close contact with the table surface. A.2.3 Determine the difference of the heights of the most prominent bulges or waves (see Figure A.1) and the height determined in A.2.2. Alternatively, for
37、 the most prominent bulges or waves, use a taper gauge (A.1.2) to determine the width of the gap between the table and the lower plate surfaces, see Figure A.2. Key 1 plate 2 measurement table 3 bulge or wave 4 height of bulge or wave Figure A.1 Illustration of a bulge or wave ISO 12635:2008(E) 6 IS
38、O 2008 All rights reservedKey 1 taper gauge, hidden below plate bulge 2 caliper marks on taper gauge 3 plate edge 4 measurement table Figure A.2 Use of a taper gauge ISO 12635:2008(E) ISO 2008 All rights reserved 7 Annex B (informative) Test methods for the height of cutting burrs B.1 Primary test m
39、ethod B.1.1 Apparatus B.1.1.1 Aluminium-plate sample cutter. B.1.1.2 Metal table base, with a steel mill table (moveable in x, y directions), firmly mounted on the table. B.1.1.3 Test stand, with gauge clamp, vertically adjustable, firmly resting on the table. B.1.1.4 Distance gauge head, with rolle
40、r anvil, secured in test stand clamp. B.1.1.5 Magnets, for firmly clamping a plate specimen to the mill table. B.1.1.6 Gauge amplifier unit, with meter. B.1.1.7 Shim strip, with 0,05 mm thickness for calibration. B.1.2 Procedure B.1.2.1 Identify leading and trailing edges, and sides of sample plate
41、and mark them accordingly using a felt-tipped pen. B.1.2.2 Use sample cutter (B.1.1.1) to cut strips, approximately 50 mm wide, off each identified edge. B.1.2.3 Set amplifier unit (B.1.1.6) to 0,1 mm. B.1.2.4 Place sample strip on mill table (B.1.1.2) with worst burr facing up and towards the gauge
42、 stand. Secure strip with magnets (B.1.1.5) on either side of burr area. B.1.2.5 Carefully lower the roller anvil on to the plate surface, a few centimetres away from burr edge. B.1.2.6 Mechanically and electronically zero the displacement indication on the meter of the gauge amplifier unit (B.1.1.6
43、). B.1.2.7 Move the mill table slowly so that the roller anvil moves towards the burr area. Observe the meter until the roller anvil drops off the edge of the strip. B.1.2.8 Record and report the highest reading. B.1.2.9 Recalibrate the meter on the gauge amplifier unit using the 0,05 mm shim strip
44、(B.1.1.7) whenever the unit has been moved, the gauge head has been replaced or adjusted, readings seem abnormal, or 24 months have elapsed since the last calibration. ISO 12635:2008(E) 8 ISO 2008 All rights reservedB.2 Derived test method B.2.1 Apparatus B.2.1.1 Aluminium-plate sample cutter. B.2.1
45、.2 Rectangular metal or stone table, with less than 0,5 mm planarity deviation. B.2.1.3 Light source, producing rays that are essentially contained in a plane, in the following named light plane. B.2.1.4 Camera, for observing the reflections of the rays from a plate on the table, i.e., the intersect
46、ion between the light plane and the plate surface. B.2.1.5 Means of measuring the height of the light trace in the image captured by the camera. B.2.2 Procedure B.2.2.1 Direct the light beam at the table surface such that it creates an illuminated track (light trace) that runs parallel to the table
47、edge. Select a suitable small angle that the light plane makes with the table plane. B.2.2.2 Position camera (B.2.1.4) opposite to light source (B.2.1.3) using suitable magnification for the imaging. Select a suitable small angle that the optical axis of the camera makes with the table plane. B.2.2.
48、3 If desired, use sample cutter (B.2.1.1) to cut approximately 50 mm wide strips off each identified edge of plate. B.2.2.4 Place plate or rectangular plate sample on the table so that the light beam scans over the worst burr area. Orientate the plate edges to be parallel to table edges. B.2.2.5 In
49、the image produced by the camera, observe and measure the height of the light trace in the burr area as compared to its value for the unperturbed plate surface. B.2.2.6 Calibrate the height determination using the primary test method, B.1. ISO 12635:2008(E) ISO 2008 All rights reserved 9 Annex C (informative) Test method for plate straightness C.1 Apparatus C.1.1 Flat table, of size that exceeds that of the largest plate to be evaluated. C.1.2 Glass ruler, with a length that exce
