BS ISO 2836:2021 pdf download – Graphic technology — Prints and printing inks — Assessment of resistance of prints to various agents 6.3 Petri dish, ≥100 mm in diameter with an additional glass disk with a diameter slightly smaller than the inner diameter of the dish. 6.4 Test tubes, 2 test tubes, of colourless glass, with inside diameter of approximately 16 mm and a height of approximately 160 mm. 6.5 Mass, 1 kg. 6.6 Stop watch, with an accuracy of 1 s. 6.7 Thermometer, capable of measuring from 10 °C to 50 °C with an accuracy of ±0,5 °C and in case of measuring molten wax a thermometer suitable for measuring up to 200 °C. 6.8 Oven, capable of maintaining a temperature of (50 ± 2) °C. 6.9 Hot plate, capable of heating to 40 °C above melting point of the wax. 6.10 White background wall, with side illumination for colour determination. 6.11 Grey scale, for colour contrast evaluation according to ISO 105-A03. 6.12 pH measuring device, e.g. test strip or meter. 6.13 Spectrocolorimeter, conforming to the requirements of ISO 13655. 7 Preparation of test pieces Test pieces may be taken from existing printed material or may be prepared to be representative of a planned printed product. If production samples are tested, it is important to know the time of production and preferably the storage conditions. Conditioning of the test pieces in accordance with ISO 187 is recommended. Prepare production prints or test prints using any suitable method that allows a uniform distribution of ink to be formed on a specified substrate and cured in an appropriate manner, for example, prepared in accordance with ISO 2834-1 for offset printing process, with ISO 2834-2 for gravure or flexographic printing processes, or with ISO 2834-3 for screen printing process. Prints shall be set, dried or cured completely before assessing the resistance. Heatset inks shall be heated to the recommended temperature, oxidative setting inks shall be allowed to fully oxidize, water or solvent inks shall be given suitable time for the loss of solvent and energy cured inks shall be exposed to the appropriate radiation (UV, LED-UV, EB) for a reasonable exposure time. Prepare at least two but preferably 4 extra test pieces for reference and comparison with the treated test pieces. 8 Test methods 8.1 General All tests are comparative by nature. Blind tests for all methods where filter papers and/or solid...
Download Address
Download