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Effect of Blank Pre-conditioning Humidity on the Dimensional Accuracy and Rigidity of Paperboard Trays by Sami-Seppo Ovaska; Panu Tanninen; Esa Saukkonen; Kaj Backfolk is a Engineering article available to read on EtoBox.

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Optimization of storage conditions is essential for successful converting of paperboard. This paper investigates the effect of blank moisture content on the dimensional accuracy and rigidity of press-formed paperboard trays. The trays were manufactured from uncoated, pigment-coated and extrusion-coated paperboards and multi-layer materials using fixed process parameters. Because of the different layer structures and coatings, the paperboards showed different hygroscopic behavior. Prior to converting trials, the bursting strength of paperboards under different moisture conditions was assessed. It was found that the moisture content has only a minor influence on bursting strength, but moisture affects blank curling tendency and dimensional accuracy of the tray. A high blank moisture content led to a loss of the dimensional stability and load-bearing capacity of trays, although based on earlier knowledge it is evident that the moisture content should be high for successful press-forming. As expected, a low blank moisture content increased the prevalence of ruptures in forming but the resulting trays were stiffer and their dimensional accuracy was better. It was suggested that the incr

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Author

Sami-Seppo Ovaska; Panu Tanninen; Esa Saukkonen; Kaj Backfolk

Publisher

Walter de Gruyter GmbH

Published

2018

Language

EN

Field

Engineering (Physical Sciences)