The Hot Pressing of Dry-formed Wood-based Composites - Part I. A Review of the Literatlire, Identifying the Primary Physical Processes and the Nature of their Interaction

Bonding kinetics of thermosetting adhesive systems used in wood-based composites: the combined effect of temperature and moisture content

“…Compressed mattresses of resinated or surface-activated particles or fibers (hereafter referred to collectively as particles) must retain their integrity when the load applied by the heated platens of the hot press is released at the end of the pressing cycle [2][3][4][5][6]. To prevent internal rupture of the product and to reduce 'springback' (increase in thickness upon press opening) to acceptable levels, the bonds between the constituents must be strong enough to counter localized internal stresses resulting in part from residual elastic and delayed elastic reactions among the distorted and densified particles.…”

“…Moreover, the bonds must be able to withstand the pressure of gases (principally water vapor) transferred to them as the press opens; such gases accumulate within the voids of the porous matrix. These internal fluid pressures have been measured in the laboratory [2,4,7,8] and in industrial boards [8], and have been predicted theoretically with the previously mentioned simulation models [2]. *The term 'particle' is used in the broad sense of the Food and Agriculture Organization [ 1 ]; the definition does not distinguish between wafers, flakes, splinters, or sawdust when used in dryformed, wood-based composites in which the bonds are primarily achieved through the use of an adhesive.…”

Wood production, wood technology, and biotechnological impacts

“…A particle board is defined as a woodbased panel manufactured under pressure and heat from particles of wood (wood chips) usually under the addition of an adhesive (EPF 2005). MDF is made from lignocellulosic fibres combined with a synthetic resin in a dry process by hot-pressing (Bolton & Humphrey 1988, Thoemen & Humphrey 2003. OSB is produced from wood shredded into rectangular strips of a few centimetres in length, by layering these strands across each other in the direction of their grain, pressing, and binding them with resin adhesives (Brinkmann 1979.…”

Comparison of model‐fitting kinetics for predicting the cure behavior of commercial phenol–formaldehyde resins

“…[1][2][3][4] Such models are important to design and optimize hot-pressing parameters during the manufacture of engineered wood-based composites. During panel consolidation, the heat of resin polymerization plays an important role.…”

“…During panel consolidation, the heat of resin polymerization plays an important role. Yet hot-pressing models have either used an arbitrary kinetic model or have not incorporated the resin cure kinetics, [1][2][3][4] hence limiting their application. To improve the accuracy of hot-pressing models, cure kinetics needs to be incorporated.…”