BS ISO 12636:2018 pdf free

BS ISO 12636:2018 pdf free.Graphic technology一Blankets for offset printing
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 m2 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.
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.
Cut a 50 mm by 300 mm (minimum) sample from the blanket with the long direction parallel to the around-the-cylinder direction. Clamp the shorter sides of the sample into a tensile strength testing apparatus with a minimum jaw separation of 200 mm. Apply the load with a jaw separation speed of 50 mm/min. Increase the load till the break occurs; read the force at break. The tensile strength is expressed in N/mm.
Due to the machine deflection inherent in all test equipment, care should be taken to compensate for this deflection when reporting results. This deflection may be in the fixtures (e.g compression cage) as well as the load cell. A test with the 100 mm2 circular load disk between the parallel flat faces is run to determine the deflection of the testing system at different loads (stress). The stress-strain curve is used to correct this instrument deflection in order to indicate the correct deflection at specific load (stress).
Due to machine deflection inherent in all test equipment, care should be taken to compensate for this deflection when reporting results. This deflection may be in the fixtures (e.g. compression cage) as well as the load cell. A test with a flat non-compressible circular disk (700±10) mm2 is run to determine the deflection of the testing system at different loads. This disk should be of minimum thickness such that all force is borne by the disk during the test. Suggested material for this disk is brass or steel. The stress-strain curve is used to correct for this instrument deflection in order to indicate the correct blanket compressibility.BS ISO 12636 pdf free download.