Effects of end-pressure on the finger-joint quality of black spruce lumber: a microscopic analysis

Bustos, Cecilia; Hernández, Roger E.; Beauregard, Robert; Mohammad, Mohammad

doi:10.4067/s0718-221x2011000300007

Cited by 22 publications

(15 citation statements)

References 5 publications

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“…4. The results of the tests did not give a robust conclusion regarding the effect of number of teeth, which is contrary to the literature cited (Bustos et al 2011 andFranke et al 2014). Therefore, a detailed analysis with respect to surface area was not included in the study.…”

Section: In Diagonal Compressioncontrasting

confidence: 91%

“…Freedman (1997) has noted that the strength of box joints comes from interlocking fingers, which create large glue surface area. Some researchers (Ayarkwa et al 2000;Bustos et al 2011;Franke et al 2014) argued that the strength of box joints are associated with surface area. However, there has been no robust demonstration that the surface area, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Effects of wood species, number of teeth, and adhesive type on moment capacities of box-joints

Demirci

Diler

Kasal

et al. 2020

BioRes

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Effects of the wood species, number of teeth, and adhesive type were studied relative to the moment capacities of box joints under tension and compression loadings, which is commonly used in case type solid wood furniture. For this purpose, L-type specimens were prepared from Scotch pine (Pinus sylvestris L.), poplar (Populus sp.), and fir (Abies sp.). Polyvinyl acetate (PVAc) and polyurethane (PU) adhesives were used in the preparation of joints. Tension and compression tests with 360 samples were performed under static loading. According to the results, the highest moment capacities were obtained for Scotch pine under tension, and poplar specimens under compression. With respect to the number of teeth, the highest moment capacities were obtained with 12-tooth joints under both tension and compression loadings. For adhesive types, the specimens glued with PVAc gave better results in both tension and compression. In manufacturing of solid wood based case-type furniture, the higher number of teeth resulted in a slightly better performance; however, the results with the 4-tooth structure was not too far from 8-tooth. Furthermore, it was concluded that Scotch pine as a substance and PVAc as adhesive could be recommended.

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Section: In Diagonal Compressioncontrasting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effects of wood species, number of teeth, and adhesive type on moment capacities of box-joints

Demirci

Diler

Kasal

et al. 2020

BioRes

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“…Foremost, application of a finger-jointing process allows the removal of strength-reducing defects. The increase of the surface area of the glue joint has been shown to produce a product with high engineering properties (Cecilia Bustos et al 2011). Finger joints with adhesives such as poly-vinyl acetate (PVA) have been studied.…”

Section: Introductionmentioning

confidence: 99%

Elastic Properties of Oak Wood Finger Joints with Polyvinyl Acetate and Isocyanate Adhesives

Hemmasi¹,

Khademi-Eslam²,

Roohnia³

et al. 2013

BioResources

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In this study, the elastic properties of 23 specimens of oak timber (Quercus castaneifolia), including the longitudinal modulus of elasticity (MOE), acoustic coefficient (K), and acoustic converting efficiency (ACE) in free vibration using the free-free beam method with different planes of vibration, i.e. tangential (LT) and radial (LR), were studied. These elastic parameters were examined in both sound wood and finger jointed timbers with two different lengths of fingers (5-and 10-mm finger lengths) and individually glued with two different types of adhesives (isocyanate and polyvinyl acetate). Comparing the elastic properties of solid beams with finger jointed beams of oak wood in both (LT) and (LR) planes, 10-mm finger joints with polyvinyl acetate adhesive did not cause any serious change to the studied elastic properties of the beams, while shorter finger length (5 mm) with isocyanate adhesive severely changed the acoustic properties; therefore, beams having longer finger lengths may have enhanced acoustical properties.

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“…The microscopic observations are representative of standard adhesive joints in or close to grain direction, such as butt joints, finger joints and scarf joints. In such joints, densification and cell damage can be induced by excessive pressure load or by local peak loads as consequence of high surface roughness (Bustos et al 2011). Under consideration of the presented results, such adhesive joints introduce a diffusion barrier with respect to the considerably larger diffusion coefficient in wood, which is affected not exclusively by the adhesive product used but also by the wood cell deformation during specimen preparation.…”

Section: Diffusion Behaviourmentioning

confidence: 90%

Water vapour diffusion through historically relevant glutin-based wood adhesives with sorption measurements and neutron radiography

et al. 2014

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In this work, the sorption and moisture diffusion behaviour of historically relevant glutin-based adhesives (i.e. bone glue, hide glue, fish glue) is characterized. The adhesive's sorption isotherms were assessed on thin film samples revealing fundamental differences between the glutin-based adhesives and the synthetic reference adhesive (polyurethane). Furthermore, the water vapour diffusion parallel to the fibre was examined by means of neutron imaging on bonded twolayer samples of Norway spruce wood. In contrast to previous studies using neutron imaging, a new evaluation approach is presented, which allows for nonzero initial moisture conditions and takes into account and compensates for the geometry changes in the sample caused by swelling and shrinkage, thus allowing for a characterization of the diffusion behaviour within the glue line. The diffusion coefficients determined with neutron imaging were interpreted in terms of a theoretical model which takes into account the glue line microstructure. Although the diffusion coefficients were on average larger values for the glutin-based adhesives compared to the reference polyurethane adhesive, the significant variation observed in the sorption measurement is not reflected. This can partially be ascribed to excessive penetration of the adhesives into the wood substrate in fibre direction, which impedes a continuous adhesive layer. Furthermore, deformation and densification of the wood structure was assessed in the vicinity of the adhesive joint. This

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Effects of end-pressure on the finger-joint quality of black spruce lumber: a microscopic analysis

Cited by 22 publications

References 5 publications

Effects of wood species, number of teeth, and adhesive type on moment capacities of box-joints

Effects of wood species, number of teeth, and adhesive type on moment capacities of box-joints

Elastic Properties of Oak Wood Finger Joints with Polyvinyl Acetate and Isocyanate Adhesives

Water vapour diffusion through historically relevant glutin-based wood adhesives with sorption measurements and neutron radiography

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