Simultaneous measurement of lathe check depth and the grain angle of birch (Betula pendula Roth) veneers using laser trans-illumination imaging

Antikainen, Toni; Eskelinen, Joona; Rohumaa, Anti; Vainio, Teemu; Hughes, Mark

doi:10.1007/s00226-015-0718-8

Cited by 13 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lathe check formation and measurement during peeling process have received a lot of attention in the past as well as more recently (Denaud et al 2007(Denaud et al , 2012Tomppo et al 2009;Pałubicki et al 2010;Dupleix et al 2013;Antikainen et al 2015;Darmawan et al 2015). Lathe check depth (LCD) has been measured traditionally by dyeing and evaluating under the microscope (Lutz 1960(Lutz , 1978 in order to identify their effect on product quality (Rohumaa et al 2013;Pot et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer

et al. 2018

Self Cite

View full text Add to dashboard Cite

Denaud. Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer. AbstractThe depth of lathe checks and integrity of veneer have been shown to be critical factors affecting the bonding process but also affecting the mechanical properties of veneer-based products. This study shows how beech (Fagus sylvatica L.) veneer lathe checks interval and depths are affected by soaking temperature, compression rate, cutting radius and cutting speed during the peeling process in well-controlled conditions. Freshly felled European beech logs were soaked in a water tank at 50, 60, 70 or 80°C. Following soaking, the logs were immediately peeled with laboratory scale lathe (SEM S500) to 3.5 mm thick veneer at a cutting speed of 1, 2 or 3 m s -1 and pressure rates of 0, 5, 10 or 15%. The correlation between lathe check depth and frequency was validated using "Système de Mesure d'Ouverture des Fissures" (SMOF) device, which enables to measure check properties reliably on veneer ribbons. In a well-controlled peeling process, the strong correlation between check depth and interval was shown. At higher temperature, shallower and more frequent checks are created compared to lower temperature. However, the effect of soaking temperature (between 50-80°C) on veneer checking is much smaller than the effect of compression rate during peeling process, where the higher compression rate produced veneer with shallower and more frequent checks. The results of the study also show that the direction of lathe check propagation could be affected by the rays in beech veneer. Rays resist crack growth in tangential direction, but act as weak planes in radial direction.

show abstract

Section: Introductionmentioning

confidence: 99%

Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The proposed method for slicing check quantification is based on highlighting the slicing checks using a black textile staining dye (Tomppo et al 2009;Antikainen et al 2015) and check segmentation using an image processing algorithm. The dye was prepared according to the manufacturer's recommendation, and veneers were surface stained.…”

Section: Methodsmentioning

confidence: 99%

“…To quantify the occurrence of checks in sliced veneers, scholars have mainly used microscopical (Buchelt et al 2018) and macroscopical (Tomppo et al 2009;Antikainen et al 2015) inspection. The advantage of these methods is the ability to detect the precise depth of checks and to observe potential co-relation between the macroscopic structure and defect occurrence.…”

Section: Introductionmentioning

confidence: 99%

“…Their method, also known as SMOF device, was further utilized and developed by Dupleix et al (2013), Pot et al (2015), and Rohumaa et al (2018). Antikainen et al (2015) presented a method for check detection based on trans-illuminance. The advantages of this method consisted in a large bending radius; thus, reducing the risk of veneer rupture.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An image processing algorithm for detection and analysis of slicing checks

Grubîi

Johansson

2021

Eur. J. Wood Prod.

View full text Add to dashboard Cite

In this paper, a new method of measuring slicing checks for flat-sliced veneers was evaluated. The method is based on image analysis of veneer cross-sections, having highlighted the slicing checks using surface staining. The segmentation of the checks consists of global thresholding followed by some morphological operations. The outputs of the algorithm are check depth ratio and check frequency. The method was tested on flat-sliced oak (Quercus robur L. and Quercus petraea (Matt). Liebl.) veneers of different thicknesses (1.5, 2.5, 3.5 and 4.5 mm). Two distinct wood qualities and two different cutting directions (lengthwise-sliced and plain-sliced veneers) were evaluated. The algorithm performance resulted in an overall accuracy of 85% enabling an accessible method for relatively fast and accurate measurements of slicing check characteristics in lamella cross-sections. Regression analysis indicated a lack of fixed bias but the presence of proportional bias with the presented method. Check measurements indicate that by varying cutting parameters, it is possible to achieve desired check characteristics independent of slicing thickness. The semi-automated slicing check detection method could benefit further research and optimisation of the slicing process parameters and pave the way towards industrial quality control of slicing checks. The intended area of application is veneer-laminated products for interior use with the focus on veneered wood flooring.

show abstract

“…Prior research has quantified veneer quality in relation to slicing check presence using parameters such as check depth ratio (CDR) and check frequency (CF) [9,11,[22][23][24][25]. CDR was defined as the check depth relative to the nominal veneer thickness, while CF was defined as the number of checks per inspected material's length.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Top-Layer Sliced Lamella Thickness and Core Type on Surface-Checking in Engineered Wood Flooring

Grubîi,

Johansson

2023

Forests

View full text Add to dashboard Cite

Surface-checking is a significant quality issue of veneer and sliced lamellae-based wood products. This study explores how surface-checking in sliced lamellae-based engineered wood Flooring (EWF) is influenced by two key structure parameters: core type and top-layer thickness. The core types assessed were a standard solid wood lamellae with a veneer back-end layer (S), a standard solid wood lamellae core with veneer back-end layers on the two sides (DS), and a single-layer oriented strand board (OS) core. The EWF element’s top-layer lamellae were plain sliced at nominal dimensions of 1.5, 2.5, 3.5, and 4.5 mm from freshly sawn slabs of European oak (Quercus spp.). The surface-checking of EWF specimens was quantified based on a digital image correlation (DIC) method, which outputs a surface-checking index. The surface-checking results were evaluated using a Tweedie compound Poisson data distribution to fit a general linear model. The model evaluated the impact of individual factors, sliced lamellae thickness and core type, and their interaction. The checking index confidence intervals were estimated using a bootstrapping technique. Findings reveal a significant interaction between studied factors and provide insight into optimizing top-layer thickness and core construction to diminish surface-checking. A low sliced lamella thickness on standard solid wood lamellae core resulted in low surface-checking, deemed relevant for further research.

show abstract

Simultaneous measurement of lathe check depth and the grain angle of birch (Betula pendula Roth) veneers using laser trans-illumination imaging

Cited by 13 publications

References 16 publications

Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer

Lathe check development and properties: effect of log soaking temperature, compression rate, cutting radius and cutting speed during peeling process of European beech (Fagus sylvatica L.) veneer

An image processing algorithm for detection and analysis of slicing checks

The Impact of Top-Layer Sliced Lamella Thickness and Core Type on Surface-Checking in Engineered Wood Flooring

Contact Info

Product

Resources

About