Wood mechanical densification: a review on processing

Luan, Yu; Fang, Carol; Ma, Yifan; Fei, Benhua

doi:10.1080/10426914.2021.2016816

Cited by 30 publications

(12 citation statements)

References 81 publications

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“…Besides, the VTC method yields non-uniform density patterns 17 . Another limitation of the previously-mentioned mechanical densi cation methods is that, although wood can be densi ed in all different directions (radial, tangential, or longitudinal), these techniques reach top densi cation values only when applied in the radial direction 19,20 . For these reasons, wood treated with any of these methods has limitations in its use.…”

Section: Introductionmentioning

confidence: 99%

Two-step hot isostatic pressing densification achieved non-porous fully-densified wood with enhanced physical and mechanical properties

Correa

Maturana

Guindos

et al. 2023

Preprint

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A new two-step densification method for wooden materials is proposed. This method achieved wood that was virtually non-porous and fully densified exceeding any value ever reported for a hardwood species. In the first step, the compressive strength of the anatomical wood structure is reduced by delignification, and, in the second, a full densification is achieved by hot isostatic pressing under argon atmosphere. Three tropical hardwood species with distinct anatomical characteristics and properties were used to test the method. The HIP-densified wood's microstructural, chemical, physical, and mechanical properties were assessed. The results indicate that proposed method was effective for all the tested species, obtaining a material that it is mostly non porous, shows homogenous density patterns, preserves the original volume, features great stability and it has enhanced mechanical properties. Therefore, the HIP wood densification may be a promising densification technique since it overcomes several limitations faced by previous wood densification methods.

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Section: Introductionmentioning

confidence: 99%

Two-step hot isostatic pressing densification achieved non-porous fully-densified wood with enhanced physical and mechanical properties

Correa

Maturana

Guindos

et al. 2023

Preprint

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show abstract

“…, hybrid aspen). 7,8 It has been reported that pre-treatment on advanced wood products such as steam, ammonia, and heat 9–18 followed by a densification process can improve the mechanical performance of natural wood. However, the wood treated with these methods resulted in an incomplete densified wood product which expanded and weakened in the presence of moisture and hence lacked dimensional stability, especially in a humid environment.…”

Section: Introductionmentioning

confidence: 99%

Polylactic acid/wood-based in situ polymerized densified composite material

Gondaliya,

Foster,

Foster

2023

Mater. Adv.

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“…It is well known that anatomical features of wood (cell length, cell wall thickness, vessel diameter, ray type and frequency, among others) are closely related to its density, mechanical properties, and therefore, its industrial applications (Luan et al 2022;Jakob et al 2022;Cabral et al 2022). For instance, longer cells and thicker cell walls result in denser wood, while shorter cells and thinner cell walls result in less dense wood.…”

Section: Introductionmentioning

confidence: 99%

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

Maturana,

Arroyave,

Hurtado

et al. 2023

Preprint

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Wood delignification is a promising approach for developing sustainable materials from tropical hardwoods. This study investigated the uniformity and efficiency of partial alkaline delignification of three commercially important tropical hardwoods (Andiroba, Sande, and Choiba) using a mixed aqueous solution of sodium hydroxide and sodium sulfite (NaOH/Na2SO3) as a pretreatment for densification. The effects and distribution of the solution under the influence of the anatomical features of each hardwood were analyzed using FT-IR, optical microscopy, and SEM. The process resulted in the partial removal of lignin and hemicellulose in varying proportions between the center and ends of the wood. This reduction in lignin and hemicellulose content led to a decrease in MOE, MOR, and hardness of the delignified wood. Additionally, the results suggest that sodium accumulation in the wood structure may also modify its mechanical properties. The relationship between the chemical treatment and the anatomical characteristics of the wood species was found to influence delignification, which in turn affected the effectiveness of densification and subsequent compression. The findings of this study suggest that alkaline delignification is a promising approach for developing new materials from tropical hardwoods, but further research is needed to optimize the process and minimize the negative impact on mechanical properties.

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Wood mechanical densification: a review on processing

Cited by 30 publications

References 81 publications

Two-step hot isostatic pressing densification achieved non-porous fully-densified wood with enhanced physical and mechanical properties

Two-step hot isostatic pressing densification achieved non-porous fully-densified wood with enhanced physical and mechanical properties

Polylactic acid/wood-based in situ polymerized densified composite material

Alkaline Delignification of Tropical Hardwoods: A promising Approach for Sustainable Material Development

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