Development od an empirical model for MDF hot press and comparison with a fundamental model

Arun Gupta, . and Jordan Patrick J., . and Shusheng P., . (2006) Development od an empirical model for MDF hot press and comparison with a fundamental model. [Proceedings Paper]

Hot pressing is one of the critical operations during manufacturing of medium density fibreboard MDF. In the hot pressing moisture mass transfer heat transfer and fibre densification interact resulting in continuing changes in mat physical chemical and mechanical properties. In order to better understand the hot pressing process both empirical investigation and theoritical modelling have been performed. The advantage of the empirical approach is that it takes less time although the result is applicable only in the range of the conditions tested. In the theoritical modelling the behaviour of wood composites is mathematically expressed by applying the fundamental laws including heat and mass transfer within the panel the stress and strain development and creep behaviour of the fibre mat and the curing kinetics of the resin. The fundamental model can be solved to predict the outcome for a wide range of raw material properties and pressing conditions but the theoritical models need validation before practical application. This paper firstly presents an empirical model developed by developed based on results for panel made under different pressing conditions in a pilot-scale press. The empirical model is used to determine the effects of mat material variables and pressing conditions on important panel properties. These properties include peak and core density modulus of rupture MOR modulus of elasticity MOE and internal bonding IB. The core temperature and internal pressure are also quantified. The predicted properties from the empirical model are then compared with the simulation results from a fundamental model described in a separate paper. From the comparison different modelling approaches in the field of wood composites are better understood and the advantages and disadvantages of each approach are analysed.

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Abstract

Hot pressing is one of the critical operations during manufacturing of medium density fibreboard MDF. In the hot pressing moisture mass transfer heat transfer and fibre densification interact resulting in continuing changes in mat physical chemical and mechanical properties. In order to better understand the hot pressing process both empirical investigation and theoritical modelling have been performed. The advantage of the empirical approach is that it takes less time although the result is applicable only in the range of the conditions tested. In the theoritical modelling the behaviour of wood composites is mathematically expressed by applying the fundamental laws including heat and mass transfer within the panel the stress and strain development and creep behaviour of the fibre mat and the curing kinetics of the resin. The fundamental model can be solved to predict the outcome for a wide range of raw material properties and pressing conditions but the theoritical models need validation before practical application. This paper firstly presents an empirical model developed by developed based on results for panel made under different pressing conditions in a pilot-scale press. The empirical model is used to determine the effects of mat material variables and pressing conditions on important panel properties. These properties include peak and core density modulus of rupture MOR modulus of elasticity MOE and internal bonding IB. The core temperature and internal pressure are also quantified. The predicted properties from the empirical model are then compared with the simulation results from a fundamental model described in a separate paper. From the comparison different modelling approaches in the field of wood composites are better understood and the advantages and disadvantages of each approach are analysed.

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Item Type:	Proceedings Paper
Additional Information:	12 ills. 2 tables. 16 refs.
AGROVOC Term:	WOOD
AGROVOC Term:	FIBRES
AGROVOC Term:	FIBREBOARDS
AGROVOC Term:	DENSITY
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:28
URI:	http://webagris.upm.edu.my/id/eprint/16933

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