BS ISO 12636:2018 pdf download – Graphic technology — Blankets for offset printing

BS ISO 12636:2018 pdf download – Graphic technology — Blankets for offset printing The printing surface material formulation and surface texture are the choice of the manufacturer and may be stated in technical descriptions by the supplier. The surface texture may vary, e.g. cast (moulded) or ground (buffed). No specification for surface texture is given in this document. The measurement method is based on 5.8. The use of data to market products is the choice of the manufacturer. The nominal (mean) thickness shall be stated in technical descriptions when ordered. Compressibility information should be given to the user and the test method shall be indicated. When testing the compatibility of blanket washes and an offset printing blanket, it is the option of the blanket manufacturer to report the test results using the test method according to 5.9 for each property. On the non-printing side of the cut-to-size blanket, the following should be reported: a) blanket dimensions (average actual thickness, width and length) indicating which dimension is the around-the-cylinder direction. If the recorded thickness is nominal, it shall be stated; b) the batch control number; c) the name of the manufacturer or the supplier and the blanket brand or trade name. 4.2 Dimension 4.2.1 Thickness The test method according to 5.2 shall be used. For applications with packing, the nominal thickness should be 1,68 mm or 1,95 mm. For applications without packing, the nominal thickness should be agreed upon between the supplier and the user of the product. The thickness variations of blankets with an area not in excess of 1,5 m 2 shall be less than ±0,02 mm. Those of greater sizes shall be less than ±0,03 mm. No individual thickness measurement shall yield a value which deviates more than 0,05 mm from the ordered thickness. 4.2.2 Mean thickness Mean thickness is an average of four measurements of a cut blanket where the measurements have been made on the points indicated in Figure 1, namely on two diagonally opposed corners and one each at the middle of the two sides that are perpendicular to each other within a right triangle. 4.2.3 Accuracy of width and length If one of the sides is 1 m or less, the tolerance shall be ±3 mm; otherwise, it shall be ±4 mm. 4.2.4 Plan view The sides of the blanket shall form right angles. The difference between the length of the diagonals and the...