Potential of shortening pressing time or reducing pressing temperature for plywood resinated with PF resin modified using alcohols and esters

Abstract

To cite this version:Radoslaw Mirski, Dorota Dziurka, Janina Łęcka. Potential of shortening pressing time or reducing pressing temperature for plywood resinated with PF resin modified using alcohols and esters. European Journal of Wood and Wood Products, Springer Verlag, 2010, 69 (2) Abstract: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. Potential von mit Alkohol und Estern modifiziertem PF-Harz zur Reduzierung der Presszeit oder der Presstemperatur bei der Sperrholzherstellung ZusammenfassungIn dieser Studie wurde untersucht, wie die Presszeit bzw.

The reduction of adhesive application in plywood manufacturing by using nanocellulose‐reinforced urea‐formaldehyde resin

“…The shear strength test is a common indicator of adhesive behavior in plywood 39,40 . The results of the bonding quality are illustrated in Figure 4.…”

Effects of Selected Parameters on the Bonding Quality and Temperature Evolution Inside Plywood During Pressing

“…The possibility of reducing hot pressing time has been studied in previous works on some types of wood composite materials, such as laminated veneer lumber (LVL) [15,16], particleboard [17], oriented strand board (OSB) [18] and medium-density fiberboard [19]. However, there are only a few studies in the existing literature regarding the effect of pressing time on the properties of plywood [16,[20][21][22][23]. Shortening the duration of plywood pressing can be realized by steam injection [20] or by veneer incising [16,21].…”

Construction particleboards made from rapeseed straw glued with hybrid pMDI/PF resin

“…Moreover, from the aesthetic point of view, the dark colour of the adhesive joint is a drawback. So far, a number of research projects have been carried out aimed at increasing the reactivity of phenolic resins through proper selection of substrates, mole ratio of reagents and condensation conditions as well as through introducing modifiers into the resin, which are meant to accelerate the cross-linking process (Park et al 1999;Conner et al 2002;Dukarska and Łęcka 2006;Mirski et al 2008Mirski et al , 2011Zhang et al 2013). Phenolic resins, just like amine resins, join surfaces through adhesion.…”