Repeated thermo-hydrolytic disintegration of medium density fibreboards (MDF) for the production of new MDF

2021-08-09 | journal article. A publication with affiliation to the University of Göttingen.

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​Repeated thermo-hydrolytic disintegration of medium density fibreboards (MDF) for the production of new MDF​
Bütün Buschalsky, F. Y. & Mai, C.​ (2021) 
European Journal of Wood and Wood Products79(6) pp. 1451​-1459​.​ DOI: https://doi.org/10.1007/s00107-021-01739-6 

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Authors
Bütün Buschalsky, Fahriye Yağmur; Mai, Carsten
Abstract
Abstract Medium density fibreboards (MDF) are currently not recycled after service life, but various publications report on recycling by the disintegration of MDF using various techniques and the properties of obtained recovered fibres (RF). In this study, the main aim was to put back RF into the MDF manufacturing process as closed-loop recycling using repeated thermo-hydrolytic disintegration. Compared to previous studies, the focus was on the recycling of MDF with a relatively low F:U molar ratio (1.11). Urea–formaldehyde-bonded MDF with a target density of 700 kg m−3 was subjected to thermo-hydrolytic disintegration in an autoclave using only water at 95 °C for 20–30 min. Afterwards, the properties of RF and virgin fibres (VF), of MDF produced thereof and the composition of the disintegration water (DW) were determined. The nitrogen content (NC) revealed that RF contained about 30% of the initially applied UF. The pH of the DW hardly changed during recycling and it contained considerable amounts of reducing sugars. Using RF did not result in higher formaldehyde emissions than VF. Compared to earlier studies using a higher formaldehyde content (higher F:U ratio), MDF bonded with modern UF resins can be disintegrated under clearly milder disintegration conditions with respect to temperature and time. The properties of recycled MDF were similar to those of reference MDF; up to 100% RF could be used without severely deteriorating the strength and increasing formaldehyde emissions from these panels.
Issue Date
9-August-2021
Journal
European Journal of Wood and Wood Products 
Organization
Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Holzbiologie und Holzprodukte 
ISSN
0018-3768
eISSN
1436-736X
Language
English
Sponsor
AiF Projekt GmbH
Georg-August-Universität Göttingen (1018)

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