Männipuidu ja kuusepuidu pinnaomaduste muutumine termilise töötlemise käigus
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Kuupäev
2024
Kättesaadavus
10.09.2024
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Antud magistritöös uuriti termilise töötlemise mõju männipuidu (Pinus sylvestris) ja kuusepuidu (Picea abies) pinnaomadustele. Puidu termilisel töötlemisel peaksid puidu termilised omadused paranema töötlemise käigus. Männi- ja kuusepuitu töödeldi viiel erineval termotöötluse astmel, mis olid Luxhammari termotöötlus ahju tootja poolt etteantud. Termotöötlus astmed erinesid temperatuuri ja ajalise kestvuse poolest. Töö eesmärgiks oli uurida, kas termiline töötlemine parandab uuritavate puuliikide pinnaomadusi. Uuritavatel katsekehadel mõõdeti pinnakõvadust, pinnakaredust ning pinna kulumist. Pinnakõvaduse mõõtmisel lähtuti Janka meetodist. Pinnakaredust mõõdeti vastavalt ISO 21920-2:2021 standardile. Pinnakareduse mõõtmisi teostati peale katsekehade hööveldamist ja katsekehade lihvimist. Pinna kulumise mõõtmiseks kasutati Taberi meetodit.
Männipuidu pinnakõvadus paranes töötlemise käigus osaliselt. Männipuidu tugevus suurenes töötlusastmetel T5, T4 ja D3. Pinnakaredus peale hööveldamist suurenes kõikidel töötlusastmetel ja peale lihvimist toimus pinnakareduse vähenemine kõikidel töötlusastmetel välja arvatud D2. Pinna kulumine vähenes ainult töötlusastmel T5.
Kuusepuidu pinnakõvadus suurenes töötlusastmetel T5 ja T4. Pinnakaredus peale hööveldamist vähenes kõikidel töötlusastmetel ning peale lihvimist vähenes ainult töötlusastmel T5. Pinna kulumine suurenes kõikidel termilise töötlemise astmetel.
In this Master´s thesis, the effect of thermal treatment on the surface properties of pine wood (Pinus sylvestris) and spruce wood (Picea abies) was investigated. Thermal treatment should improve the properties of wood. Pine and spruce wood were processed in five different stages of heat treatment. These stages were predetermined by the manufacturer of the Luxhammar thermal modification oven. The heat treatment stages differed in terms of temperature and duration. The aim of the work was to investigate whether thermal treatment improves the surface properties of pine and spruce wood. The surface hardness, surface roughness and abrasion resistance were measured. The Janka method was used to measure surface hardness. The surface roughness was measured according to the ISO 21920-2:2021 standard. The surface roughness was measured after planing and grinding the test pieces. The Taber method was used to measure surface wear. The surface hardness of the pine wood was partially improved during the treatment. The strength of pine wood increased at treatment levels T5, T4 and D3. The surface roughness after planing increased at all thermal treatments levels. After sanding there was a decrease in surface roughness at all thermal treatments levels except D2. Surface wear decreased only at level T5. The surface hardness of spruce wood increased at thermal treatments levels T5 and T4. Surface roughness after planing decreased at all thermal treatments levels and after sanding only decreased at level T5. Surface wear increased at all stages of thermal treatment.
In this Master´s thesis, the effect of thermal treatment on the surface properties of pine wood (Pinus sylvestris) and spruce wood (Picea abies) was investigated. Thermal treatment should improve the properties of wood. Pine and spruce wood were processed in five different stages of heat treatment. These stages were predetermined by the manufacturer of the Luxhammar thermal modification oven. The heat treatment stages differed in terms of temperature and duration. The aim of the work was to investigate whether thermal treatment improves the surface properties of pine and spruce wood. The surface hardness, surface roughness and abrasion resistance were measured. The Janka method was used to measure surface hardness. The surface roughness was measured according to the ISO 21920-2:2021 standard. The surface roughness was measured after planing and grinding the test pieces. The Taber method was used to measure surface wear. The surface hardness of the pine wood was partially improved during the treatment. The strength of pine wood increased at treatment levels T5, T4 and D3. The surface roughness after planing increased at all thermal treatments levels. After sanding there was a decrease in surface roughness at all thermal treatments levels except D2. Surface wear decreased only at level T5. The surface hardness of spruce wood increased at thermal treatments levels T5 and T4. Surface roughness after planing decreased at all thermal treatments levels and after sanding only decreased at level T5. Surface wear increased at all stages of thermal treatment.
Kirjeldus
Magistritöö
Metsatööstuse õppekaval
Märksõnad
magistritööd, harilik mänd, harilik kuusk, termiline töötlemine, pinnaomadused