Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type

A batch of pine timber sawn from butt, middle and top logs was strength graded with the visual method (classification into grading classes KW—best quality, KS—medium quality, KG—inferior quality and Reject) and with the machine strength grading method—performed with the use of a mobile timber grader...

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Autores principales:	Izabela Burawska-Kupniewska, Sławomir Krzosek, Piotr Mańkowski
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	stress grading sawn timber mechanical properties MOR MOE Plant ecology QK900-989
Acceso en línea:	https://doaj.org/article/ce416ca81c04419cac8ea1d611874c23
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spelling	oai:doaj.org-article:ce416ca81c04419cac8ea1d611874c232021-11-25T17:37:35ZEfficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type10.3390/f121114671999-4907https://doaj.org/article/ce416ca81c04419cac8ea1d611874c232021-10-01T00:00:00Zhttps://www.mdpi.com/1999-4907/12/11/1467https://doaj.org/toc/1999-4907A batch of pine timber sawn from butt, middle and top logs was strength graded with the visual method (classification into grading classes KW—best quality, KS—medium quality, KG—inferior quality and Reject) and with the machine strength grading method—performed with the use of a mobile timber grader (classification into C strength classes). We compared the efficiency of grading classes and strength classes, depending on the type of log from which the material was obtained (butt, middle, top). Next, a strength grading machine was used to measure the modulus of elasticity in bending (MOE) and static bending strength (MOR). The ANOVA confirmed the influence of both the log type (butt, middle, top), the C strength class, and the visual strength grading class on the values of density (DEN) and MOR. Timber density and MOR decreased from the butt log section to the top log section. The ANOVA confirmed the influence of log type on MOE values, but only to a limited extent.Izabela Burawska-KupniewskaSławomir KrzosekPiotr MańkowskiMDPI AGarticlestress gradingsawn timbermechanical propertiesMORMOEPlant ecologyQK900-989ENForests, Vol 12, Iss 1467, p 1467 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	stress grading sawn timber mechanical properties MOR MOE Plant ecology QK900-989
spellingShingle	stress grading sawn timber mechanical properties MOR MOE Plant ecology QK900-989 Izabela Burawska-Kupniewska Sławomir Krzosek Piotr Mańkowski Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
description	A batch of pine timber sawn from butt, middle and top logs was strength graded with the visual method (classification into grading classes KW—best quality, KS—medium quality, KG—inferior quality and Reject) and with the machine strength grading method—performed with the use of a mobile timber grader (classification into C strength classes). We compared the efficiency of grading classes and strength classes, depending on the type of log from which the material was obtained (butt, middle, top). Next, a strength grading machine was used to measure the modulus of elasticity in bending (MOE) and static bending strength (MOR). The ANOVA confirmed the influence of both the log type (butt, middle, top), the C strength class, and the visual strength grading class on the values of density (DEN) and MOR. Timber density and MOR decreased from the butt log section to the top log section. The ANOVA confirmed the influence of log type on MOE values, but only to a limited extent.
format	article
author	Izabela Burawska-Kupniewska Sławomir Krzosek Piotr Mańkowski
author_facet	Izabela Burawska-Kupniewska Sławomir Krzosek Piotr Mańkowski
author_sort	Izabela Burawska-Kupniewska
title	Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
title_short	Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
title_full	Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
title_fullStr	Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
title_full_unstemmed	Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type
title_sort	efficiency of visual and machine strength grading of sawn timber with respect to log type
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ce416ca81c04419cac8ea1d611874c23
work_keys_str_mv	AT izabelaburawskakupniewska efficiencyofvisualandmachinestrengthgradingofsawntimberwithrespecttologtype AT sławomirkrzosek efficiencyofvisualandmachinestrengthgradingofsawntimberwithrespecttologtype AT piotrmankowski efficiencyofvisualandmachinestrengthgradingofsawntimberwithrespecttologtype
_version_	1718412194984493056

Efficiency of Visual and Machine Strength Grading of Sawn Timber with Respect to Log Type

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