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Potential von mit Alkohol und Estern modifiziertem PF-Harz zur Reduzierung der Presszeit oder der Presstemperatur bei der Sperrholzherstellung

Mirski, Radosław, Dziurka, Dorota, Łęcka, Janina
European journal of wood and wood products 2011 v.69 no.2 pp. 317-323
Betula, Pinus, esters, formaldehyde, manufacturing, phenol, plywood, polyols, pressing, product quality, resins, temperature, wood quality, wood treatment
The study was an analysis of the potential to shorten pressing time or reduce pressing temperature for plywood resinated with alcohol- and ester-modified PF resin. Birch and pine plywoods were produced using such modified resin at a temperature range of 135 to 115 °C, at a constant pressing time (4 min) and at pressing times ranging from 240 to 150 s at a constant pressing temperature (135 °C). Tests showed that the application of PF resin modified with polyols and esters makes it possible, under standard pressing conditions, i.e. 135 °C and pressing time of 4 min, to produce plywood with improved properties in comparison to respective control plywoods. Moreover, it was shown that the used modifiers enhance resin reactivity, facilitating an adequate course of resin curing, resulting in the manufacture of plywoods with good properties even at a pressing temperature reduced by 20 °C or pressing time shortened to 150 s.