Männipuidu tangentsiaalne kahanemine
Laen...
Kuupäev
2017
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Eesti Maaülikool
Abstrakt
Siinse bakalaureusetöö eesmärgiks on uurida hariliku männi (Pinus sylvestris L.)
analüüsketaste tangentsiaalset kahanemist kuivatamisel. Töö fookuses on sügis- ja
kevadpuidu aastarõngaste laiuste kahanemise võrdlemine.
Käsitletud teema aktuaalsus seisneb selles, et männi puit on Eestis laialdaselt kasutatav
nii ehituses kui ka mööblitööstuses ning puidu kuivamise ning kahanemise detailne
tundmine võimaldab tagada puidu töötlemisel parema tulemuse. Uurimustöö aluseks
olevad analüüskettad olid lõigatud ja kogutud eelnevate lõputööde (Epler 2014, Ploom
2015) käigus Tartumaalt Järvselja kvartalitelt JS221 ja JS222. Siinses bakalaureusetöös
kaaluti esmalt analüüskettad ning mõõdeti seejärel aastarõngaste laiused. Järgmises töö
etapis kuivatati neid ahjus 103 ± 2 °C juures 48h jooksul. Lõpptulemuste saamiseks
korrati mõõtmisprotsessi, et selgitada välja, kuidas on kaal ja aastarõngaste laiused
muutunud.
Saadud tulemustest võib järeldada, et hariliku männi kuivatamisel on sügispuidu
tangentsiaalne kahanemine suurem kui kevadpuidul.
The aim of this bachelor’s thesis is to study the tangential shrinkage of the Scots pine (Pinus sylvestris L.) in the process of drying. The focus is on the comparison of the tangential shrinkage of the growth rings on early and latewood. The topic is actual as Scots pine is widely spread in Estonia both in the construction and furniture industry. In addition, detailed knowledge about the drying and shrinking process of wood enables to ensure a better result in processing wood. The analysed boards were cut and collected in the course of previous works (Epler 2014, Ploom 2015) from Tartu county Järvselja forest blocks JS221 and JS222. The boards used in this thesis were first weighed and thereafter the growth rings were measured. The boards were then dried in an oven at 103 ± 2°C for 48 hours. The measuring process was then repeated to find out how the weight and the growth rings had changed while the wood was dried. The results show that by drying the Scots pine the latewood’s tangential shrinkage is greater than early wood’s.
The aim of this bachelor’s thesis is to study the tangential shrinkage of the Scots pine (Pinus sylvestris L.) in the process of drying. The focus is on the comparison of the tangential shrinkage of the growth rings on early and latewood. The topic is actual as Scots pine is widely spread in Estonia both in the construction and furniture industry. In addition, detailed knowledge about the drying and shrinking process of wood enables to ensure a better result in processing wood. The analysed boards were cut and collected in the course of previous works (Epler 2014, Ploom 2015) from Tartu county Järvselja forest blocks JS221 and JS222. The boards used in this thesis were first weighed and thereafter the growth rings were measured. The boards were then dried in an oven at 103 ± 2°C for 48 hours. The measuring process was then repeated to find out how the weight and the growth rings had changed while the wood was dried. The results show that by drying the Scots pine the latewood’s tangential shrinkage is greater than early wood’s.
Kirjeldus
Bakalaureusetöö
Metsanduse õppekaval
Märksõnad
bakalaureusetööd, mänd, kuivatamine, varapuit, hilispuit, aastarõngad