Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Lestari, Andi Sri Rahayu Diza; Hadi, Yusuf Sudo; Hermawan, Dede; Santoso, Adi

doi:10.15376/biores.10.4.7419-7433

Cited by 32 publications

(29 citation statements)

References 8 publications

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“…The MOE of laminated composite made with tannin adhesive was lower than that of the solid wood. The MOE of laminated composite (4096.43 ± 955.76 MPa) was also lower than the MOE of glulam (4726.61 MPa) made from jabon and sengon wood with mahogany adhesive (Lestari et al 2015). Based on Supartini (2012), the MOE of laminated composite made from jabon with mangium adhesive was slightly lower than that of jabon cross laminated timber with MDI (4,824.87 ± 0.18 MPa).…”

Section: Modulus Of Elasticitymentioning

confidence: 87%

“…The reactivity can be affected by the bark freshness, source of wood, tree habitat, and extraction methods (Achmadi 1990). Tannin extract accounted for 198.3 g of 1 kg mangium bark or 19.83%, and it had a Stiasny number of 83.48% (w/w), which was higher than that for mahogany extract (79.7%; Lestari et al 2015). This finding indicated that mangium extract has a high amount of reactive polyphenol available for polymerization and would be appropriate for use as a resin.…”

Section: Chemical Analysis Of Mangium Tannin Extractmentioning

confidence: 88%

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Properties of Laminated Composite Panels Made from Fast-Growing Species Glued with Mangium Tannin Adhesive

et al. 2016

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Laminated composite is a wood panel constructed from timber pieces then are laminated together. Bio-adhesives such as tannin adhesive are a potential alternative to synthetic adhesives. The purposes of this study were to characterize the chemical makeup of tannin from mangium (Acacia mangium) bark extract and to determine the physical-mechanical properties of the panels made from jabon (Anthocephalus cadamba) and sengon (Falcataria moluccana), and adhesives based on either mangium tannin or methylene diphenyl diisocyanate (MDI). The panels made from five layers of lamina were 5 cm × 24 cm × 120 cm in thickness, width, and length, respectively. Based on results from gas chromatography-mass spectrometry, mangium tannin had 34.04% phenolic compounds. Both wood species were low density, 0.31 g/cm 3 for sengon and 0.44 g/cm 3 for jabon, with an average moisture content of 12.4%. The panels had better width shrinkage than solid wood, with an anti-shrink efficiency of 72.5%. With regard to mechanical properties, none of the panels met the standard for the MOE or shear strength; however, sengon panel with MDI met the standard for MOR. In the delamination test, sengon panel was resistant to cold water immersion. All panels had low formaldehyde emission and met the standard requirements.

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Section: Modulus Of Elasticitymentioning

confidence: 87%

Section: Chemical Analysis Of Mangium Tannin Extractmentioning

confidence: 88%

Properties of Laminated Composite Panels Made from Fast-Growing Species Glued with Mangium Tannin Adhesive

et al. 2016

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“…To determine the delamination of specimens extracted from glued laminated timber beams, 6 specimens with 7.5 x 6.0 x A cm (length, width and A = thickness) were drawn in parallel to the fibers, using the methodology described by Lestari et al (2015).…”

Section: Properties Of the Glued Laminated Timber Beamsmentioning

confidence: 99%

Number of laminae on the mechanical behavior of glued laminated timber (glulam) of Toona ciliata produced with vegetable polyurethane adhesive

et al. 2019

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The glued laminated timber (glulam) is a composite material obtained from the bonding of wood laminae arranged with parallel fibers put together. The purpose of this paper was to evaluate the influence of the number of laminae on the mechanical behavior of glulam of Toona ciliata produced with vegetable-based polyurethane adhesive. The glulam beams were produced with lamellae in the dimensions of 6.0 x 1.5 x 120.0 cm, with 3 beams being made per treatment, which were structurally composed by 5, 7 and 9 laminae. The polyurethane adhesive based on castor oil was used, applying a grammage of 350 g m-². For the technological characterization of the wood the moisture in the dry base, bulk density, chemical characterization, compressive strength parallel to the fibers, shear and modulus of elasticity (MOE) and rupture (MOR) in the static bending test. While the properties of modulus of elasticity (MOE), modulus of rupture (MOR), shear strength, delamination and visualization of the glue line through photomicrographs of the laminated wood samples were determined for glulam beams. The results showed that the beams with 5 laminae presented values similar to solid wood. The increase in the number of laminae provided lower values for stiffness and strength of the beams. The photomicrographs showed the quality of the bonding and the satisfactory values for shear strength and delamination, indicating the viability of the species under study for situations with high moisture content.

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“…However, the present use of commercial tannins for leather manufacturing [122], and beverages [123] limits their availability for other industrial resins. Despite this, tannins have been the subject of extensive research, leading to the exploration of a wide range of adhesive applications [14,101,124]. Attempts have been made to commercialize tannin-based adhesives with limited success [125].…”

Section: Tanninmentioning

confidence: 99%

“…Glulam from three layers of lamina has been manufactured by using a mahogany tanninadhesive system, composed of tannin extract and formaldehyde [124]. The results showed that the adhesive was on par with the conventional adhesive for glulam manufacturing regarding mechanical and physical properties, and had low formaldehyde emission.…”

Section: Tanninmentioning

confidence: 99%

Green Binders for Wood Adhesives

Norström¹,

Demircan²,

Fogelström³

et al. 2018

Applied Adhesive Bonding in Science and Technology

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Today's society relies heavily on glued wood products for constructions, furniture, and floorings, for example. Essentially, all adhesives on the market are based on fossil-based resources, and many also contain formaldehyde to yield sufficient reactivity and adhesive performance. Formaldehyde is soon to be banned from consumer goods in Europe, due to its carcinogenic and allergenic features. With the rapidly growing societal environmental awareness, it becomes evident that it is crucial to seek greener, more sustainable alternatives. There is nothing new to this idea; on the contrary, prior to the advent of synthetic polymers, a range of biopolymers such as proteins and starch, were successfully used. However, since adhesives based on synthetic polymers were found to perform better, especially regarding the water resistance, the naturally sourced adhesives have had a subordinate role up until recently. The growing interest for using bio-polymers from renewable resources, such as wood/forest, corn, and cereals have spurred significant R&D developments toward the use of bio-polymers in green wood adhesives. The scope of the present chapter is to summarize, in short, some of the most recent scientific literature regarding the development of green adhesives.

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Glulam Properties of Fast-growing Species Using Mahogany Tannin Adhesive

Cited by 32 publications

References 8 publications

Properties of Laminated Composite Panels Made from Fast-Growing Species Glued with Mangium Tannin Adhesive

Properties of Laminated Composite Panels Made from Fast-Growing Species Glued with Mangium Tannin Adhesive

Number of laminae on the mechanical behavior of glued laminated timber (glulam) of Toona ciliata produced with vegetable polyurethane adhesive

Green Binders for Wood Adhesives

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