Impregnation of Scots pine and beech with tannin solutions: effect of viscosity and wood anatomy in wood infiltration

Tondi, Gianluca; Thévenon, Marie-France; Mies, Brigitte; Standfest, Gernot; Petutschnigg, Alexander; Wieland, Stefanie

doi:10.1007/s00226-012-0524-5

Cited by 72 publications

(57 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The excellent impregnation of the melamine samples may be due to the lower viscosity of the modifier. Viscosity has been found to affect the uptake of a solution (Larnøy et al 2005, Dubey et al 2011, especially in pine wood (Tondi et al 2013).…”

Section: Treatmentmentioning

confidence: 99%

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Lahtela

Kärki

2014

Wood Material Science & Engineering

View full text Add to dashboard Cite

Wood modification, of which thermal modification is one of the best-known methods, offers possible improvement in wood properties without imposing undue strain on the environment. This study investigates improvement of the properties of heat-treated solid wood. Scots pine (Pinus sylvestris) was modified in two stages: impregnation with modifiers followed by heat treatment at different temperatures. The impregnation was done with water glass, melamine, silicone, and tall oil. The heat treatment was performed at the temperatures of 180°C and 212°C for three hours. The modified samples were analyzed using performance indicators and scanning electron microscope micrographs. The mechanical and physical properties were determined with water absorption, swelling, bending strength, and impact strength tests. All the modifiers penetrated better into sapwood than hardwood; however, there were significant differences in the impregnation behavior of the modifiers. As regards the effect of heat treatment, generally the moisture properties were improved and mechanical strengths impaired with increasing treatment temperature. In contrast to previous studies, the bending strength increased after melamine impregnation and mild heat treatment. It is concluded that the properties of impregnated wood can be enhanced by moderate heat treatment.

show abstract

Section: Treatmentmentioning

confidence: 99%

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Lahtela

Kärki

2014

Wood Material Science & Engineering

View full text Add to dashboard Cite

show abstract

“…The only samples that are not impregnated in depth are the pine pieces prepared and treated with 20% of tannin solution and all series of samples for bending tests. Further information concerning the mechanism of penetration of these species can be found in Tondi et al, Tondi et al (2012aTondi et al ( , 2012b.…”

Section: Concept Of Penetrationmentioning

confidence: 99%

Tannin-boron preservatives for wood buildings: mechanical and fire properties

et al. 2012

Self Cite

View full text Add to dashboard Cite

The remarkable biological properties of tanninboron wood preservatives for outdoor applications have been investigated recently (Thevenon et al. in Eur. J. Wood Prod. 67:89, 2009). In the present paper mechanical and fire-proofing attributes of these formulations are determined. Mechanical properties of Scots pine and beech specimens treated with tannin-based formulations were examined in compression and bending strength tests and surface hardness was determined. The tannin-hexamine formulations reticulated into the wood structure improve the strength of the treated specimens. The treated samples which underwent compression, bending, hardness and gluing tests showed improvements of on average 20%.Fire tests have been monitored regarding short and long flame exposure time. Short tests such as ignition, flame and ember time have allowed the ignition of the fire to be simulated, while the weight loss tests have provided a good overview of the behavior of the specimens during prolonged fire. A positive effect on fire-resistance is shown when wood is treated with tannin formulations. The fire-proofing properties of the resin have been upgraded adding boron and phosphorus. The ember time of the pieces treated using this method can be reduced by up to ten times.

show abstract

“…As reported by Anttila et al (2013), the impurity of the extracts may act in opposition to the tannins' efficiency against fungal growth, providing easily accessible mono-and oligomeric sugars for fungi and thus enabling their growth on treated material. In addition, a significant volume of carbohydrates can increase the viscosity of tannin solutions, which decrease the penetration efficacy of the wood cells (Pizzi 2008, Thévenon et al 2009, Tondi et al 2013. Bianchi et al (2016) have proposed a way to increase the tannin concentration in softwood bark extracts relative to other compounds by inserting a cold-water extraction step before the hot water extractions.…”

Section: Introductionmentioning

confidence: 99%

Life cycle assessment of tannin extraction from spruce bark

Ding¹,

Bianchi²,

Ganne-Chédeville³

et al. 2017

iForest

View full text Add to dashboard Cite

(1)Tannins have shown antifungal effects and have been considered a potential natural compound for wood preservation. Extracts produced from softwood bark contain both tannins and non-tannin compounds, which may reduce the effectiveness of tannin used as a wood preservative. The purpose of this research is to study the environmental impact of hot water extraction, identify the hot spots within the tannin cradle-to-gate life cycle and give suggestions to optimize its environmental profile. Different extraction and postextraction scenarios of tannin production are compared using the life-cycle assessment method. Experiments were designed to study the tannin yield under different extraction scenarios; the post-extraction scenario analysis was based on literature review. The results show that the extract drying process is the primary contributor to the environmental impact of tannin production. Both preliminary cold water extraction and ultrafiltration after extraction are beneficial as they have fewer non-tannin compounds in the final products; however, preliminary cold water extraction had a considerably lower environmental performance. Successive extractions using fresh water at each cycle increased the total tannin yield, but increased the environmental burden. Using only evaporation to obtain a desired tannin concentration is not environmentally efficient. This paper provides a quantified environmental analysis for the development of tannin-treated wood products and discusses the different tannin extraction scenarios from an environmental point of view.

show abstract

Impregnation of Scots pine and beech with tannin solutions: effect of viscosity and wood anatomy in wood infiltration

Cited by 72 publications

References 16 publications

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Effects of impregnation and heat treatment on the physical and mechanical properties of Scots pine (Pinus sylvestris) wood

Tannin-boron preservatives for wood buildings: mechanical and fire properties

Life cycle assessment of tannin extraction from spruce bark

Contact Info

Product

Resources

About