Quality of structural timber-product specification system required by end-users

Johansson, G.; Kliger, Robert; Perstorper, Mikael

doi:10.1007/bf02615017

Cited by 41 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One of the factors that has the greatest influence on the utilisation of wood from a wide range of species, including radiata pine (Pinus radiata D. Don), is lack of dimensional stability caused by spiral grain (Johansson et al 1994). Spiral grain angle (SGA) is defined as the orientation of fibres (tracheids) with reference to the longitudinal axis of the tree stem.…”

Section: Introductionmentioning

confidence: 99%

Differences in intra-tree variation in spiral grain angle for radiata pine

Watt

Kimberley

Harrington

et al. 2013

New Zealand Journal of Forestry Science

View full text Add to dashboard Cite

Background: Spiral grain angle (SGA) is an important factor affecting the distortion and utilisation of solid timber. Little research has investigated how SGA varies at a fine scale within trees and whether this fine-scale threedimensional variation is similar between genotypes. The objectives of this research were to (i) characterise threedimensional variation in SGA within stems and clones, and (ii) understand how intra-stem variation in SGA varies between genotypes.

show abstract

Section: Introductionmentioning

confidence: 99%

Differences in intra-tree variation in spiral grain angle for radiata pine

Watt

Kimberley

Harrington

et al. 2013

New Zealand Journal of Forestry Science

View full text Add to dashboard Cite

show abstract

“…Studs and boards with shape stability problems are prone to warping during the drying process in sawmills. Among different types of wood warp, especially twist makes studs and boards less valuable as structural timber and severely twisted pieces must be sorted and discarded [14]. While the culling of form defects improves product quality, they nonetheless represent a significant economic loss to the mill [26].…”

Section: Introductionmentioning

confidence: 99%

“…While the culling of form defects improves product quality, they nonetheless represent a significant economic loss to the mill [26]. In Scandinavia, shape stability problems in Norway spruce (Picea abies (L.) Karst), primarily due to twist, result in * Corresponding author: Henrik.Hallingback@vbsg.slu.se large economic losses to the building construction and sawmill industries [14,22,26].…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters for grain angle in 28-year-old Norway spruce progeny trials and their parent seed orchard

2008

View full text Add to dashboard Cite

-• Sawn wood which acquires twist during drying is a substantial problem for the sawmill industry and is to a large extent caused by spiralled grain in the tree.• In this study, the feasibility of using spiral grain angles as a selection trait in Norway spruce (Picea abies (L.) Karst) tree breeding and the extent of grain angle and its breeding values were investigated. Grain angles under bark and diameter were measured at breast height in three 28-year-old Norway spruce progeny trials and in their parent seed orchard.• The mean grain angle value was 1.76 • in the progeny trials and 1.84 • in the seed orchard. Estimated genetic standard deviations for grain angle were almost 1 • . Progeny trial heritabilities (H 2 > 0.3) were larger than the seed orchard heritability (H 2 = 0.24). Genotype by environment interaction among the progeny trials was negligible for grain angle. Progeny trial grain angles exhibited genetic correlation with seed orchard grain angles in the range 0.66 to 0.84.• Thus, mature wood grain angles are also under considerable genetic control, raising the opportunity to reduce the occurence of left-grained trees, which are prone to producing twisted wood. spiral grain / shape stability / heritability / breeding / Picea abies Résumé -Paramètres génétiques de l'angle du fil du bois étudiés dans des descendances d'épicéa commun âgés de 28 ans et chez leurs parents en verger à graines.• Les déformations au séchage du bois scié sont un problème majeur pour l'industrie du bois et sont pour une large part causées par l'angle du fil du bois.• Dans cette étude, nous avons étudié la possibilité d'utiliser l'angle du fil du bois comme critère de sélection pour l'amélioration génétique de cette propriété chez l'épicéa commun. Les angles du fil du bois sous écorce ainsi que le diamètre à 1,30 m ont été mesurés dans trois tests de descendances d'épicéa commun âgés de 28 ans et dans un verger à graines où sont localisés les parents.• L'angle moyen du fil du bois était de 1,76˚dans les tests de descendances et de 1,84˚dans le verger à graines. L'écart-type génétique estimé pour l'angle du fil était de presque 1˚. Les héritabilités estimées en tests de descendances (H 2 > 0,3) étaient plus fortes que celle obtenue en verger à graines (H 2 = 0,24). L'interaction G×E était négligeable entre tests de descendances. Les angles du fil obtenus en tests de descendances montraient une corrélation génétique de 0,66-0,84 avec les angles obtenus en verger à graines.• En conclusion, nous montrons que les angles du fil du bois mature sont sous contrôle génétique fort, ce qui permet d'envisager la réduction de la fréquence d'arbres à fil gauche, très sujets à produire du bois vrillé.angle du fil du bois / stabilité du bois / héritabilité / amélioration génétique / Picea abies

show abstract

“…Spiral grain is a topic of considerable importance to end-users, as grain deviation from the vertical axis may cause technological difficulties such as warping [28] and, when severe, also reduced strength properties [20]. Recent studies of end-user expectations on structural lumber have stressed particularly the importance of shape stability [18,27]. Among the different types of distortions, twist was shown to be the most severe type in coniferous species causing downgrading or rejection of a significant proportion of the lumber [15,33].…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters for spiral-grain angle in two 19-year-old clonal Norway spruce trials

et al. 2002

View full text Add to dashboard Cite

-Spiral grain was measured for all annual rings on wood discs taken at a single sampling height from two 19-year-old (field age) Norway spruce (Picea abies (L.) Karst.) clonal trials. In both trials, the mean grain angle reached a maximum inclination to the left at ring number 4, followed by a monotonic decrease towards a right-handed inclination. Clonal means of mean grain angle of rings 3 to 15 ranged from 0.5 to 4.7 degrees and from -0.2 to 5.3 degrees in the two trials, respectively. The broad-sense heritability of mean grain angle was 0.42 in both trials and the slope of the radial grain-angle development showed heritabilities varying between 0.26 and 0.40. Estimates of genotypic correlations indicated that clones with a high grain angle in the inner rings tended to have a more rapid development towards a straight angle in the following rings. Selection based on any of the rings in the interval from ring numbers 5 to 10 was most efficient in decreasing the average grain spirality at the sampling level considered. spiral grain / heritability / genotypic correlation / correlated response Résumé -Paramètres génétiques de l'angle du fil du bois dans 2 tests clonaux d'Épicéa commun âgés de 19 ans. L'angle du fil du bois a été mesuré pour tous les cernes à partir de disques prélevés à la même hauteur dans 2 tests clonaux d'Épicéa commun (Picea abies (L.) Karst.) âgés de 19 ans. Dans les 2 dispositifs, l'angle moyen atteint une inclinaison maximale à gauche au cerne 4. Elle est suivie d'une diminution monotonique de l'angle vers une inclinaison à droite. Les moyennes clonales de l'angle moyen des cernes 3 à 15 s'étalent de 0,5 à 4,7 degrés et de -0,2 à 5,3 degrés respectivement dans les deux tests. L'héritabilité au sens large de l'angle du fil est de 0,42 dans les 2 essais et la pente de la régression de l'angle sur les cernes annuels présente une héritabilité variant entre 0,26 et 0,40. Les corrélations génotypiques montrent que les clones avec un angle élevé dans les cernes proches de la moëlle ont tendance à présenter une évolution plus rapide de l'angle vers un angle droit dans les cernes suivants. Une sélection basée sur un des cernes compris entre le 5 e et le 10 e est apparue plus efficace pour diminuer l'angle moyen du fil au niveau de l'échantillon considéré.angle du fil / héritabilité / corrélation génotypique / gain génétique

show abstract

Quality of structural timber-product specification system required by end-users

Cited by 41 publications

References 0 publications

Differences in intra-tree variation in spiral grain angle for radiata pine

Differences in intra-tree variation in spiral grain angle for radiata pine

Genetic parameters for grain angle in 28-year-old Norway spruce progeny trials and their parent seed orchard

Genetic parameters for spiral-grain angle in two 19-year-old clonal Norway spruce trials

Contact Info

Product

Resources

About