Evaluation of Creasing and Folding Performance on Printed Paperboard Packaging


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Yu-Ju Wu and Tom Reeves


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The major functions of a package are to protect, contain, and promote products. Paperboard   can   be converted into   packages   by relatively   straightforward operations   such as cutting, folding, and gluing.  To make the paperboard packages appealing for consumers, the fold lines must be neat and undamaged. However, a difficulty in paperboard converting is the cracking of paperboards during   folding.   Cracked   folds   render   printed   packages less appealing to consumers. The purpose of this study is to evaluate creasing and folding performance of different grades of printed paperboards.  Paperboards printed with water-based flexo ink, oil-based offset ink, and pigment-based ink-jet ink were tested. Three grades of solid bleached board (SBS), 10-point, 12-point, and 13-point, were used in the test.  A  flatbed  sample  maker  from  Gerber  was employed  to  perform  die-cutting  and creasing.  Creasing is carried out with creasing rules, which have rounded ends.  Different  creasing  settings  (with a scale ranging from numbers 17, 33, 42, and 50) were experimentally  applied to determine  the  creasing  property of  tested  paperboards.  It was found that the creasing settings No. 33 and No. 42 creates better and well-defined folding lines during the subsequent folding, especially with CD crease. The crease rule used in this study works well with the 13-point paperboard.  It forms great shape of crease bead, creates thin, multilayer structure for either CD or MD, resulting in clear defined fold lines.

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