Effect of rapeseed oil heat treatment on surface quality of eastern cotton wood

Document Type : Complete scientific research article

Authors

Academic staff

Abstract

Background and objectives:Surface quality of solid wood and wood based panels is a one of the most important properties influencing on the some of prodution processes such as finishing or adhestion strength characteristics.The surface roughness of wood, is a one of most importat factors to determing of the surface quality of wood, that in the aplications of wood solid playing important role. In addition to this, in producing wood panel products such as laminated veneer lumber (LVL) and plywood, significant in the adhestion process.Also success of high surface finishings(priming, painting, varnishing, andetc) with the objective of preservation, improvement and increasing of the furniture economic value as one of the final product, correlation with the surface smooth of wood material.‌Thermal treatment of wood is known to improve wood properties by reducing hygroscopicity, improving dimensional stability and enhancing the resistance against biological attack. Rapeseed oil heat treatment, is a one of the wood heat treatment effective methods, that boom and camercialized in the late decade in the Germany.Migration of extractives to the surface of wood during thermal treatment results in the formation of unsightly resin patches that need to be removed by planning. Therefore, in the industrial scale, after the heat treatment, planning the wood surface. As respects there is no any research about the effect of rape‌seed oil heat treatment, and also effect oftimes and temperatures of treatment different on the surface quality of rapeseed oil heat treated wood.Therefore, in this research, Investigating the effect of rapeseed oil heat treatment as one of the heat treatment methods on the surface quality of eastern cottonwood.



Materials and methods
Wood samples with the dimensionals of 50×50×2mm (tangential × longitudinal× radial) were prepared from sapwood of poplar wood. Then samples treated with rapeseed oil at the temperatures of 180, 200 and 220‌°c for 2 and 4hr. A portable stylus profilometer was employed to measure the surface roughness parameters (Ra, Rq, Rz) and Abbott- Firestone curve(Rk, Rpk, Rvk,) before and after the rapeseed oil heat treatment.
Conclusion: The results of this research showed that rapeseed oil heat treatment reduced the surface roughness and Abbott- Firestone curve parameters of heat treated wood samples than control samples. Increasing of the treatment temperature not significant effect on the forenamed parameter. Increasing of the treatment time from 2 hr to 4 hr only reduced significantely of the R'pk parameter.
Resuls: the obtained results of this research showed that rapeseed oil heat treatment caused improvement of the surface quality ofsamples in often of thetreatment times and temperatures.

Keywords

Main Subjects

References

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Journal of Wood and Forest Science and Technology
Volume 24, Issue 4
March 2018
Pages 41-55

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