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Discoloration of Printed Polyethylene Films

By: Kent Shah

Color Converting Industries

There are a number of papers published which discuss the yellowing or pinking (discoloration) of white polyethylene films. However, there is no reference nor sufficient explanation on the role of printing ink in such discoloration. Research presented herein is directed toward understanding the chemical interaction of the ink ingredients with film ingredients, which subsequently results in the film discoloration. An accurate description of the role that different ink ingredients play in the film...

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