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Evolutions in food packaging printing

You are here: Conferences & Events * 2011 Budapest * Abstracts * 2. Printing Materials

2. Printing Materials

2.10 Influence of flexographic inks on optical density of full tone fields and contrast in printing on the biodegradable films

Joanna Izdebska, Halina Podsiad?o

Abstract
Biodegradable films were printed with commercial flexographic inks: water-based and solvent based with differ resins. Six biodegradable, compostable films which are the samples of three kinds of such materials were selected; 3 based on cellulose, 2 PLA and 1 starch blends. The optical density of full tone and halftone fields were measured and relative printing contrast were calculated. Some properties of inks tests as well as adhesive and scratching tests of printed films were submitted in the paper. The influence of inks on optical density and contrast, main quality parameters are discussed. Flexographic inks for printing of available on the market biodegradable films enable to obtain, on proper selection of ink and kind of printing base, copies of good quality.

Keywords:
flexographic inks, optical density, relative printing contrast, biodegradable film
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2.11 Evaluation of image segmentation algorithms for folded substrate analysis

Magdolna Apró, Dragoljub Novakovi?, Szabolcs Pál

Abstract
This paper presents an analysis of segmentation algorithms in respect to their accuracy to detect failures (cracked surfaces) on folded substrates. For this purpose an initial set of 24 algorithms was chosen in a way to cover a wide range of segmentation algorithm types. The analysis was performed in two steps. The first step was a rough, visual comparison and served as an initial filter to reduce the number of potential algorithms. The four best performing algorithms were then further analysed in the second step, using objective measures like: misclassification error, modified Hausdorff distance, positive and negative false detection.

Besides the segmentation algorithms, a basic analysis of colour spaces and smoothing pre-filters was performed, too. Best results were derived by the Maximum Entropy algorithm.

Keywords: image segmentation, folding, quality assessment
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