scholarly journals Evaluation of Internal Cracks and Collapse in Poplar Wood (Populus nigra) during a Conventional Drying Process with Ultrasonic Inspection

2012 ◽  
Vol 4 (2) ◽  
pp. 141-145
Author(s):  
Saeid ESHAGHI ◽  
Hadi DASHTI ◽  
Mahdi SHAHVERDI
Keyword(s):  
Ultrasonic Inspection ◽  
Populus Nigra ◽  
Poplar Wood ◽  
Drying Process ◽  
Conventional Drying

scholarly journals Effects of Wollastonite Nanofibers on Biological Durability of Poplar Wood (Populus nigra) against Trametes versicolor

BioResources ◽  
2013 ◽  
Vol 8 (3) ◽  
Author(s):  
Ali Karimi ◽  
Hamid Reza Taghiyari ◽  
Akram Fattahi ◽  
Samaneh Karimi ◽  
Ghanbar Ebrahimi ◽  
...  
Keyword(s):  
Trametes Versicolor ◽  
Populus Nigra ◽  
Poplar Wood ◽  
Biological Durability

scholarly journals Supercritical CO2 drying of food matrices

2018 ◽  
Author(s):  
S. Spilimbergo ◽  
A. Zambon ◽  
T. M. Vizzotto ◽  
G. Morbiato ◽  
M. Toffoletto ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Supercritical Drying ◽  
Microbial Inactivation ◽  
Process Conditions ◽  
Drying Methods ◽  
Drying Process ◽  
Promising Alternative ◽  
Supercritical Co2 Drying ◽  
Conventional Drying ◽  
Drying Efficiency

This work explore the use of supercritical CO2 drying as alternative technique for the obtainment of pasteurized and high quality dried product. Several tests were conducted on animal, vegetable and fruit matrixes in order to investigate the effectiveness of SC-CO2 drying process at different process conditions. Design of experiment was performed to find the optimal process conditions for vegetable and fruit matrices, using the final water activity of the products as key indicator for the drying efficiency. The inactivation of naturally present microorganisms and inoculated pathogens demonstrated the capability of SC-CO2 drying process to assure a safe product. Moreover, retention of nutrients was compared with conventional drying methods. Results suggest that supercritical drying is a promising alternative technology for food drying. Keywords: supercritical drying; carbon dioxide; food drying; microbial inactivation

scholarly journals Microwave and convective air on drying of araucaria angustifolia seeds

2021 ◽  
Vol 42 (3Supl1) ◽  
pp. 1487-1498
Author(s):  
Naiara Nobre dos Reis ◽  
◽  
Joyce Yumi Taira ◽  
Leda Battestin Quast ◽  
Ernesto Quast ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Microwave Power ◽  
Microwave Drying ◽  
Alternative Methods ◽  
Total Phenolic ◽  
Araucaria Angustifolia ◽  
Internal Temperature ◽  
Drying Process ◽  
Hot Air ◽  
Conventional Drying

Microwave drying has shorter processing times compared with convection drying, which results in high-quality products and reduced energy consumption. The objective of this study is to evaluate the drying process of Araucaria angustifolia seeds using hot air at atmospheric pressure by applying microwaves (300 W and 500 W), and comparing them with the conventional drying process using hot air (80 °C). The drying time using hot air with microwaves at 500 W and 300 W was reduced by 83.33% and 73.89%, respectively, compared with conventional drying. The drying process occurred in the transient regime, with the predominance of a period of decreasing drying rate. The internal temperature of Araucaria seeds increased with the exposure time to the drying process, whereas the moisture content decreased. This tendency was greater for seeds subjected to electromagnetic fields, especially those exposed to higher power. The total phenolic compounds (TPCs) were lower by microwave drying when compared with conventional drying. The TPC loss was influenced by the internal temperature of the seed. Alternative methods to promote the increased retention of phenolic compounds during the drying process include decreasing the microwave power before the end of drying, combining traditional microwave-associated drying methods, and controlling the applied microwave power.

scholarly journals Drying quality and colour of subfossil oak from central Serbia

2018 ◽  
pp. 157-172
Author(s):  
Marko Veizovic ◽  
Zdravko Popovic ◽  
Nebojsa Todorovic ◽  
Goran Milic
Keyword(s):  
Colour Change ◽  
Case Hardening ◽  
Drying Process ◽  
Oak Wood ◽  
Kiln Drying ◽  
Conventional Drying ◽  
Drying Conditions ◽  
Subfossil Wood ◽  
Drying Quality

The subject of this paper is the analysis of the quality of natural and conventional drying of subfossil oak wood. In addition to the drying quality, the colour of this material, as well as the effect of the drying process on colour change have been tested. The subfossil oak logs that were used in this experiment originate from the Morava River in Central Serbia. After sawing, timber was air-dried to about 20% moisture content (MC) followed by kiln-drying to 9.5% MC. By examining the quality of air-drying of the subfossil oak wood, a high presence of cracks was found, as well as the inaccuracy of humidity measurement using electric moisture meters. The stack for kiln-drying consisted of 24 boards, of which 4 were used for the monitoring of MC and MC distribution across the thickness of plank during drying. Drying quality was evaluated after the kiln-drying process. Although mild drying conditions during kiln-drying were applied, the gap as a measure of case-hardening had a value greater than usual for oak of same thickness. It was found that the drying process has no significant effect on the change in the colour of subfossil wood. The colour of the subfossil oak wood was significantly darker than the usual oak wood, and the colour difference between the central and the outer parts of the trunk of the subfossil oak was determined.

scholarly journals Effects of Thermo-Vibro-Mechanic® densification on the density and swelling of pre-treated Uludağ fir and black poplar wood

BioResources ◽  
2021 ◽  
Vol 16 (1) ◽  
pp. 1581-1599
Author(s):  
Mehmet Budakçı ◽  
Süleyman Şenol ◽  
Mustafa Korkmaz
Keyword(s):  
Compression Ratio ◽  
Tangential Direction ◽  
Populus Nigra ◽  
Low Density ◽  
Poplar Wood ◽  
Application Time ◽  
Black Poplar ◽  
Different Temperatures ◽  
Tangential Directions ◽  
Control Samples

The radial and tangential swelling as well as the fully dried density of low-density wood materials densified via the Thermo-Vibro-Mechanic® method were evaluated in response to applying wood stain and preservative. The samples obtained from Uludağ fir (Abies bornmüelleriana Mattf.) and black poplar (Populus nigra L.) in the radial and tangential direction were pre-treated with wood stain and preservative before undergoing Thermo-Vibro-Mechanic® densification. Thermo-Vibro-Mechanic® densification was performed at three different temperatures (100 °C ± 3 °C, 120 °C ± 3 °C, and 140 °C ± 3 °C), three different vibration pressures (0.60 MPa, 1.00 MPa, and 1.40 MPa), and three different vibration times (20 s, 60 s, and 100 s). Afterwards, changes in the fully dried density and swelling amounts in the radial and tangential directions of the samples were determined. The fully dried density increased by 15.4% to 38% and the radial and tangential swelling amounts increased by 73.2% to 242.6%, when the densified samples were compared to the control samples. In general, the fully dried density and swelling values increased depending on the Thermo-Vibro-Mechanic® densification parameters; higher values were found as the compression ratio and total application time increased.

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