Effects of coating ageing on the acoustic properties of Norway spruce (Picea abies)

Straže, Aleš (avtor), Žigon, Jure (avtor), Pavlič, Matjaž (avtor)

Norway spruce (Picea abies L. Karst) wood is a preferred resonance material for musical instruments, but the surface coatings used to protect it also alter its acoustic behaviour. In this study, the effects of nitrocellulose and polyurethane coatings on spruce lamellas during an ageing period of 300 days were investigated. Gloss, hardness, impact resistance, resonance frequencies, vibration damping (tan δ) and acoustic conversion efficiency (ACE) were measured. Both coatings initially reduced the resonance frequencies and moduli of elasticity (E), while increasing the tan δ and reducing the ACE, with the nitrocellulose having a greater effect. Ageing led to greater hardness, lower tan δ and improved ACE, which can be attributed to the progressive curing of the coatings. The strong correlation between hardness and acoustic parameters suggests that mechanical surface properties may serve as predictors of acoustic effectiveness. Polyurethane maintained acoustic performance better than nitrocellulose, although impact resistance decreased with ageing. These results emphasize the importance of choosing coating systems that balance durability and long-term acoustic requirements in instrument making.

• Jezik: Angleški jezik
• Ključne besede: spruce wood, nitrocellulose, polyurethane, acoustic properties, damping, coating properties, coating ageing
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: BF - Biotehniška fakulteta
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2025
• Št. strani: Str. 1-15
• Številčenje: Vol. 15, iss. 11, [art. no.] 1264
• PID: 20.500.12556/RUL-175551
• UDK: 630*8
• ISSN pri članku: 2079-6412
• DOI: 10.3390/coatings15111264
• COBISS.SI-ID: 255614467
• Datum objave v RUL: 04.11.2025

Gradivo je del revije

• Naslov: Coatings
• Skrajšan naslov: Coatings
• Založnik: MDPI AG
• ISSN: 2079-6412
• COBISS.SI-ID: 523035673

Licence

• Licenca: CC BY-NC 4.0, Creative Commons Priznanje avtorstva-Nekomercialno 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc/4.0/deed.sl
• Opis: Licenca Creative Commons, ki prepoveduje komercialno uporabo, vendar uporabniki ne rabijo upravljati materialnih avtorskih pravic na izpeljanih delih z enako licenco.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: smrekov les, nitroceluloza, poliuretan, akustične lastnosti, dušenje, lastnosti premazov, staranje premazov

Projekti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P4-0015-2020
• Naslov: Les in lignocelulozni kompoziti

• Financer: ARIS - Javna agencija za znanstvenoraziskovalno in inovacijsko dejavnost Republike Slovenije
• Številka projekta: P4-0430-2022
• Naslov: Gozdno-lesna veriga in podnebne spremembe: prehod v krožno biogospodarstvo