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G. PVDC. MVTR papers include roll and ream wrapper, ‘keep fresh’ boxes and linerless folding cartons. 3 Water-resistant grades that are primarily wax-coated corrugated boxes. Although wax provides excellent water resistance and wet stiffness, it is not recyclable. 4 Blood-resistant grades for packing meat and poultry. 5 O2 and CO2-resistant grades for certain types of food packaging. Page 25 © Copyright Pira International Ltd 2005 Innovations in Ink on Paper Technology to Improve Printability Paper Many different chemical formulations are currently being used to obtain the abovementioned barrier properties.

FM screening, on the other hand, keeps the dots the same size and varies the frequency, or number, of dots and the location of those dots to simulate the original image. 4. Such methods avoid the problem we just discussed of Moiré patterns when colours are overprinted. The designation frequency-modulated (FM) screening results from observing that the random dithering methods use constant sized dots with variable spacing, as opposed to variable sized dots with constant spacing (amplitude modulation) for conventional halftones.

This enables the creation of the device profiles, as defined by the ICC, with a CIE deviceindependent colour space as the PCS. Page 37 © Copyright Pira International Ltd 2005 Innovations in Ink on Paper Technology to Improve Printability Prepress Using the measurement of the characteristics of the devices, colour management software has been developed to generate the device profiles. Using the profiles for all of the devices, application software can calculate the transformations necessary to keep the colour consistent throughout the production chain.

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