Effect of Nondestructive Evaluation of Veneers on  the Properties of Laminated Veneer Lumber (LVL)  from a Tropical Species

Menezzi, Cláudio Henrique Soares Del; Mendes, L. R.; Souza, Mário de; Bortoletto, Geraldo

doi:10.3390/f4020270

Cited by 10 publications

(6 citation statements)

References 11 publications

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“…A study on red maple [13] showed that the flexural properties of LVL can be predicted using ultrasonic method and suggested that the performance of LVL can potentially be enhanced through ultrasonic rating of individual veneer sheets. The same conclusions have been made in a study for LVL made of Schizolobium parahayba [14]. Another study conducted on southern pine [15] used ultrasonic method and transverse vibration and showed that the prediction of the bending stiffness using these methods is less accurate and reliable for LVL compared to solid wood.…”

Section: Introductionsupporting

confidence: 67%

An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber

Viguier

Bourgeay

Rohumaa

et al. 2018

Construction and Building Materials

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This study proposes an innovative model based on local grain angle measurements to predict the modulus of elasticity of LVL made from beech. It includes a veneers sorting method industrially compatible thanks to its low computational time. For this study 41 LVL panels were prepared from 123 beech sheets of veneers. Local grain angle was obtained with a two dimensional scanner and veneer density was measured. Several models based on these measurements have been developed and their ability to predict the modulus of elasticity of LVL panels have been compared. The model based only on local grain angle measurements have been proven more efficient than models taking into account the veneer density. The proposed method can be used to sort veneer during the peeling process and grade the production of LVL panels to optimize their mechanical properties even for low-quality veneer.

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Section: Introductionsupporting

confidence: 67%

An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber

Viguier

Bourgeay

Rohumaa

et al. 2018

Construction and Building Materials

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“…The strength properties of the product along with its dimensional stability are required in such sectors. Several factors have major influence on the mechanical properties of plywood, especially on the bending strength (MOR) and modulus of elasticity (MOE), namely wood species, density, structure, moisture content, number of veneer layers, and type of adhesive and its spreading [2][3][4][5][6][7]. Various modification methods can be used to improve the properties of such products, the thermo-mechanical densification at elevated temperatures of solid wood is one of these methods [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Veneer Densification Temperature and Wood Species on the Plywood Properties Made from Alternate Layers of Densified and Non-Densified Veneers

Salca

Bekhta

Seblii

2020

Forests

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In this study the properties of plywood manufactured from densified and non-densified veneer sheets and alternate layers of such veneers with and without densification using low amount of adhesive as a function of densification temperature and wood species were investigated. The plywood panels were made from rotary-cut birch and black alder veneers using urea-formaldehyde (UF) adhesive. Veneer sheets with thickness of 1.5 mm were subjected to the thermal-compression at three different temperatures while keeping constant the pressure during a same time span. Five-layers plywood panels were produced using a constant hot-pressing schedule using different amounts of glue spread as a function of the plywood type; such as plywood made from non-densified (80 g/m2) and densified (60 g/m2) veneers only; and combination of them (70 g/m2). The bending strength (MOR) and the modulus of elasticity (MOE) along with the shear strength of the plywood samples for bonding class 1 (dry conditions) have been determined. As expected bending strength of the plywood samples increased with the increasing in density. The increase of veneer densification temperature resulted in a gradually decrease of MOR; MOE and shear strength values for the plywood panels made of densified veneers and mixed panels of both species. The temperature of 150 °C for veneer densification seemed to be enough to achieve enhanced bending and bonding properties. All plywood panels in this study were manufactured using reduced glue consumption and they presented satisfactory properties performance for indoor applications.

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“…Laminated veneer lumber (LVL) panels, in which veneers are glued mostly in the longitudinal direction, seem to be an adequate way to use these veneers, since, in this material, homogenization of the overall product is standard (facilitating better properties than solid wood [3][4][5][6]). Moreover, it is possible to improve the mechanical properties and natural durability of the product by sorting the veneers before LVL panel construction [7][8][9][10][11]. A method proposed by Bleron et al [12] based on the local density can predict the mechanical properties of Douglas-fir products.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Influence of Knots on Douglas-Fir Veneer Fiber Orientation

Frayssinhes

Girardon

Denaud

et al. 2020

Fibers

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This study presents a method for predicting the local fiber orientation of veneers made from peeled Douglas-fir logs based on the knowledge of the tree branch characteristics (location, radius, insertion angle, azimuth angle, and living branch ratio). This model is based on the Rankine oval theory approach and focuses on the local deviation of the fiber orientation in the vicinity of knots. The local fiber orientation was measured online during the peeling process with an in-house-developed scanner based on the tracheid effect. Two logs from the same tree were peeled, and their ribbons were scanned. The knot locations and fiber orientation were deduced from the scanner data. The first objective was to compare the fiber orientation model with measurements to enhance and validate the model for French Douglas-fir. The second objective was to link data measurable on logs to veneer quality.

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Effect of Nondestructive Evaluation of Veneers on the Properties of Laminated Veneer Lumber (LVL) from a Tropical Species

Cited by 10 publications

References 11 publications

An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber

An innovative method based on grain angle measurement to sort veneer and predict mechanical properties of beech laminated veneer lumber

The Effect of Veneer Densification Temperature and Wood Species on the Plywood Properties Made from Alternate Layers of Densified and Non-Densified Veneers

Modeling the Influence of Knots on Douglas-Fir Veneer Fiber Orientation

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