Czasopismo | OPAKOWANIE | Rocznik 2012 - zeszyt 9e

Influence of freezing upon the selected mechanical properties of paper products

WŁODZIMIERZ SZEWCZYK

nr katalogowy: 71168

Within the framework of the activities carried out in the Papermaking and Graphic Art Institute of the Technical University of Łódź, Poland, tests have been executed with the purpose to determine the influence of freezing upon the load capacity of corrugated board and boxes made of it and also angle protectors made of solid board. Changes in moisture content and selected strength properties of tested paper products in the defrosting process were analysed. As result of tests it was found that during the defrosting of fibrous materials a considerable decrease in their mechanical strength takes place, which should be taken into account in determining the strength of packages made of them. Introduction Mechanical properties of paper products to a considerable extent depend upon their humidity. This problem has been analysed in various research works [1-6]. On the basis of them it has been found among others that the influence of humidity has particularly big significance for products made from secondary fibres [6] because in such cases an increase in moisture content of fibrous material brings about a large drop in its mechanical properties. With the current trend to use papers and boards made with the share of recycled materials (waste paper) for the production of packaging these problems acquire particular significance. In general they are considered when storage or transport of packaged goods in conditions of higher air relative humidity takes place, although also other cases occur in practice when in determining the mechanical properties of paper packaging it is necessary to take into account the influence of humidity. To such cases belongs the storage of packaged goods in freezers. Many board package manufacturers and users encounter the problem of insufficient strength of boxes, in which products subjected to freezing and defrosting together with their packaging are stored. One of the factors that are decisive for th[...]

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2012-9e

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