The influence of defibration pressure and fibres drying parameters on the properties of HDF made with recovered fibres
| Autor: | Conrad M. Sala, Grzegorz Kowaluk |
|---|---|
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Annals of WULS, Forestry and Wood Technology. 111:143-159 |
| ISSN: | 2719-6518 1898-5912 |
| DOI: | 10.5604/01.3001.0014.7354 |
| Popis: | Defibration pressure and fibres drying parameters influence on the HDF properties made with recovered fibres. The objective of this study was to investigate the defibration pressure and fibres drying process parameters (influence on the mechanical, physical properties and on formaldehyde content (FC) of ultrathin (2.5 mm) industrial high-density fibreboards (HDF) produced with 5% of recovered HDF (rHDF) addition. For this investigation the fibres were produced in industrial defibrator under four different set points: 0.65 MPa (V1), 0.90 MPa (V2), 1.00 MPa (V3) and 1.06 MPa (V4), dried in industrial two stage dryer with four different dryer inlet temperatures set points: 100°C (V00), 111°C (V11), 122°C (V22) and 133°C (V33). The results indicated that pressure is a significant factor and affects for all HDF properties. Too low defibrator pressure negatively influences HDF mechanical and physical properties as well as FC (high level). Regarding fibre drying temperature influence on HDF properties, no straight correlation was found. Linear negative correlation was found for modulus of rupture – 10% decrease comparing V00 to V33, internal bond – 23% decrease comparing V00 to V22 and surface soundness – also 23% decrease comparing V00 to V33. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|