Abstract
Impregnated papers are widely used as decorative, protective and balance sheets in decorative laminates for the furniture, flooring and building industries. One important property of such composites is their warping behaviour. Especially for laminate flooring, warping of the lamellae is undesirable. In the present study the influence of important process parameters in the manufacturing of impregnated papers is quantitatively analyzed based on an industrial experiment carried out at an Austrian impregnation plant. Catalyst concentration, moisture content, resin loading and base paper supplier were varied according to an experimental design. The thermal properties of the impregnated papers and the warping behaviour of the corresponding boards were evaluated using response surface methodology. The resulting models allowed quantifying the relative importance of single factors on composite warp and defining the useful working range. Determination of the thermal properties of impregnated papers using DSC and TMA was not sufficient to predict laminate warp.
Zusammenfassung
Imprägnierte Papiere werden in dekorativen Schichtstoffen in großen Mengen als Dekoroberflächen, Schutzfilme und Gegenzugpapiere in der Möbel-, Fußboden- und Bauindustrie eingesetzt. Das Verbiegungsverhalten derartiger Schichtstoffe spielt dabei eine wichtige Rolle. Insbesondere bei der Anwendung in Laminatfußböden ist eine zu starke Verbiegung der Lamellen unerwünscht. In der vorliegenden Studie wird anhand eines industriellen Versuchs an einer österreichischen Papierbeschichtungsanlage der Einfluss zentraler Prozessparameter der Papierimprägnierung auf die Verbiegung quantitativ analysiert. Die Faktoren Härterkonzentration, Feuchte, Harzbeladung und Rohpapierlieferant wurden nach einem statistischen Versuchsplan variiert. Die thermischen Eigenschaften der imprägnierten Papiere und das Biegeverhalten der beschichteten Platten wurden mittels Response Surface Analyse untersucht. Damit war es möglich, die relative Bedeutung der einzelnen Prozessfaktoren auf die Biegung des Verbunds zu quantifizieren und ein Prozessfenster zu definieren. Die Bestimmung der thermischen Eigenschaften von imprägnierten Papieren mittels DSC und TMA war nicht ausreichend um das Biegeverhalten vorherzusagen.
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Kandelbauer, A., Teischinger, A. On the warping behaviour of particleboards coated with melamine formaldehyde resin impregnated papers . Eur. J. Wood Prod. 67, 367–378 (2009). https://doi.org/10.1007/s00107-009-0327-z
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DOI: https://doi.org/10.1007/s00107-009-0327-z