Vacuum contact drying kinetics of Jack pine wood and its influence on mechanical properties: industrial applications

Ouertani, Sahbi; Koubaa, Ahmed; Azzouz, Soufien; Hassini, Lamine; Dhib, K. Ben; Belghith, Abdelfettah

doi:10.1007/s00231-014-1476-0

Cited by 17 publications

(11 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ouertani et al (2015) did not detect any significant changes in the MOE and MOR in vacuumdried Pinus banksiana compared with convective drying processes; these results are similar to those of the present study. In contrast, Altun et al (2011) found increases in bending and compression strength in infrared-dried Pinus sylvestris wood in vacuum conditions compared with wood dried in a conventional kiln.…”

Section: Resultssupporting

confidence: 91%

Effect of Vacuum and Pressure Treatments on the Mechanical Properties and Moisture Balance of Wood from Pinus sylvestris

Villasante¹,

Laina²,

Vignote³

2016

BioResources

View full text Add to dashboard Cite

Several works have analyzed the alteration in the mechanical strength of wood after the application of protective substances. However, it remains unclear whether the significant differences obtained are caused by the protective substances, the pressure and vacuum conditions used in the treatment, or the simultaneous effect of both. In this study, 123 wood samples from Pinus sylvestris were tested for bending, and 85 samples were tested for compression strength parallel to the grain. These samples were randomly distributed in three groups (treated with water pressure, water vacuum, and control samples simply submerged in water). The results indicated that there was no difference in mechanical properties between the treated and untreated samples. In contrast, significant differences were detected in equilibrium moisture after a prolonged drying process.

show abstract

Section: Resultssupporting

confidence: 91%

Effect of Vacuum and Pressure Treatments on the Mechanical Properties and Moisture Balance of Wood from Pinus sylvestris

Villasante¹,

Laina²,

Vignote³

2016

BioResources

View full text Add to dashboard Cite

show abstract

“…The authors concluded that the storage modulus and loss modulus were the lowest for FVD, which they suggested was due to damage to cell walls during the freezing process [82]. Ouertani et al [103], in research involving jack pine lumber and vacuum drying with conductive heating, determined that drying temperature, vacuum pressure, and lumber grade all affected the mechanical properties of the resulting material. The mechanical properties of vacuumdried wood (namely modulus of elastic, maximal strength, and modulus of rupture) were also compared with those of conventionally dried material, and no statistical differences were found [103].…”

Section: Vacuum Drying and Mechanical Propertiesmentioning

confidence: 99%

“…Ouertani et al [103], in research involving jack pine lumber and vacuum drying with conductive heating, determined that drying temperature, vacuum pressure, and lumber grade all affected the mechanical properties of the resulting material. The mechanical properties of vacuumdried wood (namely modulus of elastic, maximal strength, and modulus of rupture) were also compared with those of conventionally dried material, and no statistical differences were found [103]. In another study, the effect of SSV drying on the mechanical properties of rubberwood was investigated and compared with that of conventionally dried wood.…”

Section: Vacuum Drying and Mechanical Propertiesmentioning

confidence: 99%

Vacuum Drying of Wood—State of the Art

Espinoza

Bond

2016

Curr Forestry Rep

View full text Add to dashboard Cite

In this paper, we review the literature published on vacuum drying of wood. Vacuum drying is not a new technology, and its use for drying wood has been suggested since the early 1900s. Technologies for vacuum drying of wood can be classified by the heating method used. In this paper, we define vacuum-drying methods in four groups: conductive heating vacuum, cyclic vacuum, superheated steam vacuum, and dielectric vacuum. Advantages of drying wood below atmospheric pressure are the ability to dry at lower temperatures (and thus lower the probability of developing some drying defects), greatly reduced drying times, color preservation, greater energy efficiency, better control of volatile organic compound emissions, and the ability to dry very large cross sections. Some characteristics that differentiate vacuum from conventional drying are that in vacuum the primary driving force is the total pressure difference, the prevailing moisture transfer mechanism is water vapor bulk flow, and there is greater water migration in the longitudinal direction. While past research has focused on increasing the understanding of the fundamental mechanisms for vacuum drying and applications to specific industries and species, more recent efforts have concentrated on improving existing methods, for example, by improving moisture control and the use of pretreatments to improve drying quality.

show abstract

“…There are different methods of drying wood, and the majority of industrial dried timber is processed with convective drying. This conventional drying of wood is slow and costly process [1]. For that reason, interest is oriented to study the electro heating technology of wood, in particular, microwave energy for specific applications in the wood industry to achieve specific objectives, such as reducing the drying time and energy consumption, accelerate internal transfers of mass and heat and providing good mechanical properties with high strength [2,3].…”

Section: Introductionmentioning

confidence: 99%

Influence of intermittent and continuous microwave heating on drying kinetics and wood behavior of Eucalyptus Gomphocephala

Habouria

Ouertani

Azzouz

et al. 2018

Proceedings of 21th International Drying Symposium

Self Cite

View full text Add to dashboard Cite

The aim of this work was to determine the microwave drying kinetics of Eucalyptus Gomphocephala wood and to investigate the influence of intermittent and continuous heating processes on the end quality of dreid samples. The average moisture content evolution and temperature of wood samples under different microwave powers were analyzed in terms of drying time and internal temperature level. Results show that the increase of microwave power level decreses the drying time and increases the internal wood temperature. Based on qualitative observations on the state of dried samples, the intermittent microwave powers intensity process present the optimal processing parameter in microwave drying of Eucalyptus wood species.Keywords: microwave drying; power; intermittent; continuous; Eucalyptus wood.

show abstract

Vacuum contact drying kinetics of Jack pine wood and its influence on mechanical properties: industrial applications

Cited by 17 publications

References 22 publications

Effect of Vacuum and Pressure Treatments on the Mechanical Properties and Moisture Balance of Wood from Pinus sylvestris

Effect of Vacuum and Pressure Treatments on the Mechanical Properties and Moisture Balance of Wood from Pinus sylvestris

Vacuum Drying of Wood—State of the Art

Influence of intermittent and continuous microwave heating on drying kinetics and wood behavior of Eucalyptus Gomphocephala

Contact Info

Product

Resources

About