ISO 12635:2021 pdf download – Graphic technology — Plates for offset printing — Dimensions.
4 Requirements 4.1 Measurement conditions Measurements shall be conducted when both measurement equipment and plates have reached a stabilized temperature of 21 °C ± 1 °C. 4.2 Plate dimensions Commonly used plate widths and heights identified by plate and press manufacturers are specified in Annex D. When selecting plate width and height, these preferred plate sizes should be used. Where these plate sizes cannot be used, plates for sheet-fed lithographic use may be of any length, L, or width, W, but shall be specified in multiples of 5 mm where the last whole number digit is 0 or 5. Plates for web lithographic use may be of any length or width but shall have their width specified in multiples of 5 mm where the last whole number digit is 0 or 5 and their length specified in multiples of 2 mm where the last whole number digit is 0, 2, 4, 6 or 8. These requirements are summarized in Table 1. Except where preferred plate sizes are being used, the tolerances for length and width shall be as shown in Table 1, the measurement conditions of 4.1 shall apply. The preferred thicknesses and their tolerances shall be as shown in Table 2.
4.4 Edge waviness for CtP plates The plate is placed coated side up on a measurement table, such as 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 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 Measurement procedures are given in Annex A. The edge waviness of non-CTP plates should also meet the requirements of 4.4. 4.5 Cutting burrs for CtP plates Cutting burrs shall not protrude more than 45 µm and should not protrude more than 30 µm on each side. Burrs shall be measured on each side and edge of the plate. NOTE Measurement procedures are given in Annex B.