Journal
NORDIC PULP & PAPER RESEARCH JOURNAL
Volume 31, Issue 1, Pages 14-19Publisher
WALTER DE GRUYTER GMBH
DOI: 10.3183/npprj-2016-31-01-p014-019
Keywords
Foam-forming; Fibre network; Acoustics; Sound Absorption; Nanofibrillated fibre
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Novel biodegradable, low-density porous materials based on wood fibres are produced in foam-laid media called foam-paper. The effects of various parameters - such as foam air-content, thickness, porosity and consistency of the foam-fibre solution-on the acoustical properties of the final products using an experimental setup based on three-microphone impedance tube are investigated. Freeze-dried foam-formed paper (foam-paper) using nanofibrillated fibres are made to study the effect of tortuosity and crowding number on the normal sound absorption coefficient. The results show that the acoustical properties of foam-formed materials using nanofibrillated fibres are much greater than the standard NBSK foam-papers. To improve the acoustical properties of standard NBSK foam-papers, the sound absorptions of compressed multi-layer foam-papers are tested. The results show that the sound absorption of compressed three-layer NBSK foam-paper is more than three times greater than a single layer NBSK foam-paper at a frequency of 1000 Hz.
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