A hot pressing simulation model for veneer-based wood composites

Jianhe Brad Wang, . and Yu Changming, . and Dai Chunping, . and Ellis Simon, . (2006) A hot pressing simulation model for veneer-based wood composites. [Proceedings Paper]

Laminated Veneer Lumber LVL and plywood are the two major veneer-based wood composites products. During LVL/plywood manufacturing the hot pressing process is crucial not only to productivity and material recovery but also to panel quality and performance. Up to now the numerical simulation of the hot-pressing process of LVL/plywood products is not available. To help better understand their hot pressing processes the main objective of the work was to develop a computer simulation model to predict heat and mass transfer of veneer-based composites during hot-pressing. On the basis of defining wood-glue mix layers through the panel thickness a prototype finite elements based LVL/plywood hot pressing model VPress was developed to simulate for the first time the changes of temperature moisture content MC and vertical density profil VDP of each veneer ply and glueline throughout the pressing cycle. This model was capable of showing several important characteristics of the hot pressing process of veener-based composites such as effects of glue spread level veneer MC density platten pressure and temperature and density profiles of the venner plies and gluelines by the model agreed well the experimental measurements. Hence the model can be used to evaluated the sensitivity of the main variables that affect hot-pressing time productivity and panel compression material recovery. This hot-pressing model is the first step to help optimize LVL/plywood hot pressing process and predict the performance of resulting panels.

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Abstract

Laminated Veneer Lumber LVL and plywood are the two major veneer-based wood composites products. During LVL/plywood manufacturing the hot pressing process is crucial not only to productivity and material recovery but also to panel quality and performance. Up to now the numerical simulation of the hot-pressing process of LVL/plywood products is not available. To help better understand their hot pressing processes the main objective of the work was to develop a computer simulation model to predict heat and mass transfer of veneer-based composites during hot-pressing. On the basis of defining wood-glue mix layers through the panel thickness a prototype finite elements based LVL/plywood hot pressing model VPress was developed to simulate for the first time the changes of temperature moisture content MC and vertical density profil VDP of each veneer ply and glueline throughout the pressing cycle. This model was capable of showing several important characteristics of the hot pressing process of veener-based composites such as effects of glue spread level veneer MC density platten pressure and temperature and density profiles of the venner plies and gluelines by the model agreed well the experimental measurements. Hence the model can be used to evaluated the sensitivity of the main variables that affect hot-pressing time productivity and panel compression material recovery. This hot-pressing model is the first step to help optimize LVL/plywood hot pressing process and predict the performance of resulting panels.

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Item Type:	Proceedings Paper
Additional Information:	11 ills. 16 refs.
AGROVOC Term:	PRESSING
AGROVOC Term:	DENSITY
AGROVOC Term:	ADHESIVES
AGROVOC Term:	HEAT
AGROVOC Term:	MASS TRANSFER
AGROVOC Term:	VENEERS
AGROVOC Term:	SAWNWOOD
AGROVOC Term:	PLYWOOD
AGROVOC Term:	SIMULATION
AGROVOC Term:	WOOD
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16911

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