engleski

Comparison of different measuring systems for printing plate´s coverage values evaluation

Quality control is a significant aspect of every industrial production. In multistep industry, such as graphic arts industry, one should control every single step of production in order to ensure desired quality level of final product. Control of lithographic printing plate is made by observing printing areas, made of photoactive coating ; or nonprinting areas, made of aluminium-oxide. In order to determine quality level of printing plate’s printing areas, control wedges with various elements are transferred from the film or computer to the printing plate and measured by the image analysis device (plate reader). Aim of this paper is to determine influence of the different measuring systems on evaluation of printing areas by coverage values measurement. For this purpose printing plates made by varying developing process were prepared. Control wedge with coverage values from 10 % to 100 %, with ascent of 10 % of coverage value per field, was transferred onto printing plate and measured with Gretag Macbeth IC Plate II plate reader and Wayne Rasband’s ImageJ program. Results of this research have shown suitability of image analysis program in evaluation of printing plate quality.

lithographic printing plate; quality control; image analysis

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