Red maple and yellow-poplar LVL from ultrasonically rated veneer

This paper presents the results of an exploratory study that investigated the performance enhancement of experimental hardwood laminated veneer lumber (LVL) materials through the application of ultrasonic sorting of veneer quality. LVL was manufactured from red maple and yellow-poplar. Peeler blocks...

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Bibliographic Details
Published in:Forest products journal 1995-07, Vol.45 (7/8), p.54-58
Main Authors: Kimmel, J.D. (Penn State University, University Park, PA.), Janowiak, J.J
Format: Article
Language:English
Subjects:
ACER RUBRUM
Applied sciences
ASSEMBLAGE EN BOIS
BOIS DEBITE
BOIS LAMELLE
CALIDAD
CHAPAS DE MADERA
CLASIFICACION DE PRODUCTOS
CLASSEMENT
Design engineering
ELABORACION DE LA MADERA
ELASTICIDAD
ELASTICITE
Exact sciences and technology
Forest products industry
JUNTAS
LIRIODENDRON TULIPIFERA
MADERA ELABORADA
MADERA LAMINADA
PLACAGE
Plywood
Polymer industry, paints, wood
Product quality
PROPIEDADES MECANICAS
PROPRIETE MECANIQUE
QUALITE
RESISTANCE MECANIQUE
RESISTENCIA MECANICA
Shear strength
Shear tests
Statistical analysis
Studies
Supplies
Test methods
TRAVAIL DU BOIS
ULTRASON
ULTRASONIDO
Wood products
Wood-based materials
Wood. Paper. Non wovens
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Summary:This paper presents the results of an exploratory study that investigated the performance enhancement of experimental hardwood laminated veneer lumber (LVL) materials through the application of ultrasonic sorting of veneer quality. LVL was manufactured from red maple and yellow-poplar. Peeler blocks for LVL fabrication were rotary peeled to a nominal thickness of 1/6 inch and were then clipped and dried into processed 52- by 102-inch veneer plies. Ply quality was subsequently evaluated using an automated veneer test machine to measure ultrasonic propagation time (UPT). The UPT measurements were plotted to establish frequency distributions. The UPT frequency distributions for both species served as a basis for veneer segregation into plies of "high" and "low" quality for layup fabrication of two different LVL materials. The first LVL was limited to a mixed veneer quality layup with a 24-ply count to fabricate 3.5-inch-thick material. The other LVL material was fabricated using an optimized 24-ply count layup. Optimized layup consisted of 12 low quality core plies with 6 high quality (lower observed UPT) plies toward each face. Test results are reported on the observed edgewise modulus of elasticity (MOEe) and flatwise MOE and modulus of rupture (MOEf and MORf) flexure properties, and shear strengths parallel and perpendicular to glueline orientation. Test results were also collected to examine the significance of the optimized layup to enhance nail (withdrawal and lateral resistance) and bolt fastener property values. Flatwise flexure properties for both species were observed to be of greater magnitude with the optimized layup. Statistical analyses (t-tests) indicate observed differences were most commonly significant for MOEf: Enhancements in fastener performance were also observed for the optimized layup LVL materials. Observed differences in fastener performance were only statistically significant
ISSN:0015-7473
2376-9637