Green gluing of oak wood (<i>Quercus conferta</i>L.) with a one-component polyurethane adhesive

Karastergiou, Sotirios; Mantanis, George I.; Skoularakos, Konstantinos

doi:10.1080/17480270802605537

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…The mechanical, morphological and chemical properties of this adhesive were detailed by Pommier and Elbez (2006). Other studies were based on the moisture cure polyurethane adhesives (Enquist et al, 2014;Karastergiou et al, 2008;Ren and Frazier, 2012;Serrano et al, 2010). All these research studies have shown positive results for the structural use of green-glued wood.…”

Section: Green Gluing Of Woodmentioning

confidence: 99%

LCA (Life Cycle Assessment) of EVP – engineering veneer product: plywood glued using a vacuum moulding technology from green veneers

Pommier

Grimaud

Prinçaud

et al. 2016

Journal of Cleaner Production

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Section: Green Gluing Of Woodmentioning

confidence: 99%

LCA (Life Cycle Assessment) of EVP – engineering veneer product: plywood glued using a vacuum moulding technology from green veneers

Pommier

Grimaud

Prinçaud

et al. 2016

Journal of Cleaner Production

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“…One-component polyurethane adhesives were developed with the same objective. The mechanical, morphological and chemical properties of this type of adhesives have been detailed in Pommier and Elbez (2006), Karastergiou et al (2008), Ren (2010), Serrano et al (2010), Sterley et al (2012). All these research studies showed positive results for the structural use of green-glued wood.…”

Section: Introductionmentioning

confidence: 98%

Experimental design to determine the manufacturing parameters of a green-glued plywood panel

et al. 2016

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The objective of this research was to investigate the technical feasibility of producing plywood by green-gluing technology. 2.5 mm thick rotary cut veneers obtained from steamed maritime pine (Pinus pinaster Ait.) logs were used. Plywood was manufactured under vacuum with veneers in a wet state. Five-layer plywood panels were produced using a one-component polyurethane adhesive to evaluate the effects of two parameters, the wood moisture content and the amount of adhesive, on the mechanical properties of plywood. First, a full factorial experimental design was realised to study the bond performance. Shear tests were carried out in order to determine the bond quality and failure type. It was observed that the values of plywood panels' shear strength depend more on the wood moisture content than on the amount of adhesive applied. A model representing the shear strength of the panels according to the manufacturing parameters was established by using statistical analyses. Another part of this study focused on microscopic observations of the bondline in order to get information about the joint morphology and the degree of adhesive penetration into the wood structure. Results suggested that definite proportions of water (moisture content between 30 and 60 %) and adhesive have to be present on wood surface when gluing to create efficient bonds. These analyses were followed by the panel's characterisation in flexure to validate the process.

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“…The growing demand for timber, leading to younger trees, with fast growing and thin logs, and a great proportion of juvenile wood, has an unavoidable need for gluing to achieve final products with larger sizes, although this raw material shows more drying difficulties. Gluing of green timber was first used over 20 years ago with the finger-jointing technique (Parker 1994;Stephens 1995) and has been successfully tested by many researchers with several adhesive types and processes (Karastergiou et al 2008;Srivaro et al 2019;Wessels et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Good results were also shown by Parker (1994), with high-MC wood, using the Greenweld process with a specific formulation of phenol-resorcinol-formaldehyde (PRF) adhesive and an accelerator to manufacture engineered wood products. Karastergiou et al (2008) and Sterley et al (2004Sterley et al ( , 2014 reported very promising results on green-glued finger joints. Mantanis et al (2011) investigated, with phenol resorcinol formaldehyde adhesive, the efficiency of green gluing with black pine, evaluating the bending strength and also the effect of finger joint orientation (vertical or horizontal fingers), obtaining a feasible modulus of rupture (MOR) and modulus of elasticity (MOE) of green glued finger-jointed specimens, and they also found that green finger joints prevented the boards from end-splitting and face gluing.…”

Section: Introductionmentioning

confidence: 99%

“…Research results on the bonding quality of green fingerjointed wood using 1C-PUR adhesive were generally very positive on several softwoods, as confirmed by Pommier and Elbez (2006) with maritime pine and Sterley et al (2014) with spruce, and also with hardwoods, such as oak and eucalyptus. Karastergiou et al (2008) studied the properties of finger jointing green Hungarian oak using 1C-PUR. The effect of finger-joint orientation (vertical or horizontal fingers) was also examined.…”

Section: Introductionmentioning

confidence: 99%

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Finger-jointing of green Eucalyptus globulus L. wood with one-component polyurethane adhesives

2021

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The use of glued finger joint in green wood, directly from the sawing process, would open the possibility to obtain glued timber from small-sized wood, achieving an efficient use of the original raw material. The gluing of finger-jointed green wood, with moisture content above the fibre saturation point, may improve the efficiency and the manufacturing process of glulam or joinery. This may be especially beneficial for a hardwood such as Eucalyptus globulus L., which is a globally important forest resource, but is a challenging wood to dry. This article presents a study on the possibility to develop finger joints with wood in green state. To compare them, conventional finger joints on dry wood and solid boards without end joints were also manufactured. Cold-setting and fast-curing commercial one-component polyurethane adhesive systems were used. Finger-jointed samples were tested to determine mean and characteristic values (5th percentile) of density, bending strength and modulus of elasticity, and the results were analysed and discussed. Green-glued joints showed no statistically significant differences compared to the solid boards and improved strength properties with respect to dry-glued joints.

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Green gluing of oak wood (Quercus confertaL.) with a one-component polyurethane adhesive

Cited by 10 publications

References 6 publications

LCA (Life Cycle Assessment) of EVP – engineering veneer product: plywood glued using a vacuum moulding technology from green veneers

LCA (Life Cycle Assessment) of EVP – engineering veneer product: plywood glued using a vacuum moulding technology from green veneers

Experimental design to determine the manufacturing parameters of a green-glued plywood panel

Finger-jointing of green Eucalyptus globulus L. wood with one-component polyurethane adhesives

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