Ultrasound evaluation of lathe check depth in birch veneer

Tomppo, Laura; Tiitta, Markku; Lappalainen, Reijo

doi:10.1007/s00107-008-0276-y

Cited by 12 publications

(10 citation statements)

References 2 publications

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“…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%

“…To automatize the LCD measurement process for online measurement, the checks have to be measured from the green veneer since measuring checks from the dry veneer is complicated due to the waviness of the veneer (Tomppo et al 2009). Moreover, check properties should be measured immediately after peeling to give a comprehensive overview on check properties and to enable quick response back to the process.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Introductionmentioning

confidence: 99%

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

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“…In particular with a view to develop an on-line control of the process, the pressure rate influence has to be investigated because it is still one of the hardest compromises that an operator has to find. Moreover, the role of the pressure rate on the check average distance or depth has never been carefully established because of a lack of efficient and quite fast measurement means even if recent attempts could be found (Tomppo et al 2009). All these developments are now possible thanks to a new powerful apparatus called SMOF which has been developed by Palubicki et al (2010).…”

Section: Resultsmentioning

confidence: 99%

Wood peeling process monitoring: a comparison of signal processing methods to estimate veneer average lathe check frequency

et al. 2011

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract Experienced peeling operators are able to adjust the settings of their device by hearing the sound coming from the process. Based on this idea, a research program was undertaken to evaluate the possibility of using acoustic or vibration measurements supplying a support decision system to assist untrained operators. The present paper deals with lathe check phenomenon which is one of the most critical defects of veneer (leading to handling difficulties, excess of glue consumption, poor veneer surface quality, etc.). Several signal processing techniques giving a spectral representation of sensors measurements are compared. Finally, an original procedure based on Power Spectral Density ratio is proposed to measure the average lathe check frequency of the veneer during the process. Prozessüberwachung beim Holzschälen: Vergleich verschiedener Verfahren zur Bestimmung der mittleren Rissfrequenz bei SchälfurnierenZusammenfassung Erfahrene Schälmaschinenführer kön-nen die Maschineneinstellungen nach Gehör vornehmen. Davon ausgehend wurde ein Forschungsprogramm initiiert, in welchem untersucht werden soll, ob Schall-oder Schwingungsmessungen als Entscheidungshilfe für unerfahrene Arbeiter genutzt werden können.

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“…The findings of the study of Tomppo et al [14] revealed that the lathe checks in birch veneer were examined with contact ultrasound, and a preliminary study for the measurement with air-coupled ultrasound from green birch veneer (moisture content 60-75%) was carried out. The contact measurements were conducted from dry veneer and then from the moistened veneer.…”

Section: Wooden Lathe and Educationmentioning

confidence: 99%

Acceptability testing and development of a novel wood lathe balanced rest

Onrejas

Etcuban

Arcadio

et al. 2019

Archives of Mechanical Technology and Materials

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The utility model discussed in this study discloses a wood lathe balancing rest that is advantageous in terms of design, ergonomics, and functions. The study aimed to fabricate a safety device for the wood lathe machine to prevent kickback and slow down vibration from the workpiece attached to the lathe machine to avoid the vibration of the workpiece and to avoid an accident to the operator and to avoid damage of the materials. The utility model is planned not exclusively to spare time yet also for the wellbeing of the laborers amid activity. It is designed to hold the workpiece when turning and control the vibration, it can be mounted on the bed of the lathe near the center of the turning planetary.

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Ultrasound evaluation of lathe check depth in birch veneer

Cited by 12 publications

References 2 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

Wood peeling process monitoring: a comparison of signal processing methods to estimate veneer average lathe check frequency

Acceptability testing and development of a novel wood lathe balanced rest

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