Flooring characteristics of thermo-mechanical densified wood from three hardwood tropical species in Costa Rica

Moya, Róger; Navarro-Mora, Ángel

doi:10.4067/s0718-221x2021000100416

Cited by 9 publications

(1 citation statement)

References 21 publications

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“…In some of these studies, the effect of additional methods applied before and after densification on spring-back was investigated. One of these methods is heat treatment (Skyba et al, 2009;Tenorio et al 2021;Li et al, 2013;Fu et al, 2016;Laine et al, 2016;Esteves et al, 2017). It is known that the spring-back is also eliminated by the effect of temperature and steam (Kunar and Sernek, 2007;Rautkari et al, 2010;Li et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of Spinning Roller in Cylindrical Densification; Spring back in Black Poplar, Larch and Cedar of Lebanon after Densification

KAYA,

SOFUOĞLU

2023

Bilge International Journal of Science and Technology Research

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Wood materials have been the solution to many needs throughout history due to their unique positive properties. By improving the properties of wood materials, their areas of use can be expanded and ensured that they are preferred. The densification process is one of the studies carried out to improve wood material properties. With densification, the physical and mechanical properties of the wood material are improved. There are many different methods used for densifying wood materials. While the densification process brings many positive properties to the wood material, an undesirable situation such as spring-back after the process is the negative side of the densification process. In this study, black poplar (Populus nigra L.), larch (Pinus nigra Arnold) and cedar of Lebanon (Cedrus libani A.Rich.) trees were shaped into cylinders on a lathe. After that, densification processes were carried out on the lathe machine using the spinning roller designed and manufactured for this purpose. Densification processes were carried out at 0.081, 0.121, and 0.202 mm/rev feed, at 200 and 400 rev/min, and 0.5 and 1 mm densification depths. The spring-back rates after densification in three different types of cylindrical wood materials were investigated. Theoretical and experimental spring-back amounts of test specimens whose surfaces were densified under different densification conditions were interpreted. When evaluated in general, the highest densification rate was obtained in black poplar wood species, 0.081 mm/rotate feed, 200 rpm spindle speed and 1 mm depth of densification. The lowest spring-back ratio was obtained in larch tree species, 0.121 mm/rotate feed, 400 rpm spindle speed and 1 mm depth of densification. The highest densification percentage was obtained in black poplar tree species, and the lowest in larch tree species. The lowest percentage of spring-back was obtained in the larch tree species and the highest in the black poplar tree species.

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