Die swell

Swelling is an irreversible wrinkles and wave formation in flat sheet material. It is inter alia the case of thin polypropylene films ( from 30 microns and thinner ) to observe a phenomenon. The reasons are, for example, in the migration of mineral oil- based inks or inorganic substances into the polypropylene matrix or to a lack of waiting time and lack of drying after printing of products that are packaged in the films.

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