different substrate groups and suggest the correct ink type for each group plastic subgroups for the purpose of ink selection adjustments made to the process colour inks for correct colour balance methods of improving opacity of a light coloured ink on a dark substrate determining the correct pad shape for (given) applications effect that pad shape and hardness have on print quality effect that commonly be seen at the contact point of the nipple of a pad in a large solid print, and how can it be avoided preparing a new pad for its first printing determining the correct plate type for (given) applications difference between steel and photopolymer plates for process printing reasons for mis-registered images and how can they be corrected OHS concerns that are there when setting presses and doctor blades adjustments to the machine so that the doctor blade is operating correctly effect of a damaged doctor blade types of doctor blades and explain their applications OHS concerns that are there when pre- and post-treating substrates common pre- and post-treatment methods for different substrates and their importance causes and solutions for common print problems (eg hairlines around image, loss of density in the centre of a solid image, fine lines of ink running through image, distortion of image, picking up ink from substrate by subsequent pads, washed out images, loss of fine lines in images, inconsistent colour) machine manuals, safety and other documentation that are relevant to this task and where they are kept and information that is included in these documents
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