Effect of steam-drying treatment on moisture content, drying rate, color, and drying defects in juvenile wood of Tectona grandis from fast-growth plantations

2017 ◽  
Vol 35 (15) ◽  
pp. 1832-1842 ◽  
Author(s):  
Róger Moya ◽  
Alexander Berrocal ◽  
María Rodriguez-Solis ◽  
Freddy Muñoz
Keyword(s):  
Moisture Content ◽  
Juvenile Wood ◽  
Tectona Grandis ◽  
Fast Growth ◽  
Drying Rate ◽  
Drying Treatment ◽  
Steam Drying

scholarly journals Laju Pengeringan Kentang Kering (Solanum tuberosum L.) dengan Menggunakan Tunnel Dehydrator

2019 ◽  
Vol 1 (1) ◽  
pp. 25
Author(s):  
Hisworo Ramdani ◽  
Jerico Naikisa
Keyword(s):  
Solanum Tuberosum ◽  
Moisture Content ◽  
Water Content ◽  
Solanum Tuberosum L ◽  
Coefficient Of Determination ◽  
Drying Rate ◽  
Color Analysis ◽  
Color Quality ◽  
Drying Treatment

AbstrakTujuan Penelitian ini yaitu untukmendapatkan laju pengeringan kentang kering yang memiliki kualitas warna dan kadar air terbaik dengan perlakuan suhu dan ukuran kentang yang diujikan. Pengeringan ini menggunakan Tunnel Dehydrator untuk mendapatkan kombinasi perlakuan suhu dan ukuran kentang dengan analisis warna dan kadar air untuk mendapatkan perlakuan terbaik dan laju pengeringan. Hasil penelitian ini mendapatkanlaju pengeringan y = -0.013x + 5.0433 dan koefisien determinasi (R2) sebesar 0.9539 atau 95.39% dengan Perlakuan pengeringan terbaik pada suhu 70˚C dengan ketebalan kentang 1 x 1 x 1 cm,rendemen 14.1 %,  kadar air 10.26% dan nilai chroma 23.35(baik sekali) Kata Kunci ; Laju pengeringan, Kentang Kering, Dehydrated Potatoes, Tunnel Dehydrator AbstractThe purpose of this study is to obtain the drying rate of dry potatoes that have the best color quality and moisture content by treating the temperature and size of the potatoes tested. This drying uses a Tunnel Dehydrator to get a combination of temperature and size treatment of potatoes by color analysis and water content to get the best treatment and drying rate. The results of this study get the drying rate y = -0.013x + 5.0433 and the coefficient of determination (R2) of 0.9539 or 95.39% with the best drying treatment at a temperature of 70˚C with potato thickness 1 x 1 x 1 cm, yield 14.1%, moisture content 10.26 % and chroma value 23.35 (very good) Keyword; Drying rate, Dry Potatoes, Dehydrated Potatoes, Tunnel Dehydrator

CATFISH DRYING (Clarias Batraclus) USING ‘TEKO BERSAYAP’ SOLAR DRYER

2012 ◽  
Vol 2 (1) ◽  
pp. 14-20
Author(s):  
Yuwana Yuwana
Keyword(s):  
Relative Humidity ◽  
Moisture Content ◽  
Ambient Temperature ◽  
Drying Rate ◽  
Drying Process ◽  
Drying Time ◽  
Ambient Relative Humidity ◽  
Solar Dryer

Experiment on catfish drying employing ‘Teko Bersayap’ solar dryer was conducted. The result of the experiment indicated that the dryer was able to increase ambient temperature up to 44% and decrease ambient relative humidity up to 103%. Fish drying process followed equations : KAu = 74,94 e-0,03t for unsplitted fish and KAb = 79,25 e-0,09t for splitted fish, where KAu = moisture content of unsplitted fish (%), KAb = moisture content of splitted fish (%), t = drying time. Drying of unsplitted fish finished in 43.995 hours while drying of split fish completed in 15.29 hours. Splitting the fish increased 2,877 times drying rate.

scholarly journals SURFACE CHEMICAL AND COLOR CHARACTERIZATION OF JUVENILE TECTONA GRANDIS WOOD SUBJECTED TO STEAM-DRYING TREATMENTS

2016 ◽  
Vol 23 (01) ◽  
pp. 1550091 ◽  
Author(s):  
ALEXANDER BERROCAL ◽  
RÓGER MOYA ◽  
MARÍA RODRIGUEZ-SOLIS ◽  
RICARDO STARBIRD ◽  
FREDDY MUÑOZ
Keyword(s):  
Color Change ◽  
Tectona Grandis ◽  
Surface Chemical ◽  
Surface Color ◽  
Teak Wood ◽  
Text Color ◽  
The Fourier Transform ◽  
Moisture Conditions ◽  
Steam Drying

The color of Tectona grandis wood is an attribute that favors its commercialization, however, wood color from fast-growth plantation trees is clear and lacks uniformity. The aim of this work is to characterize steamed teak wood by means of the Fourier transform infrared spectroscopy (FTIR) and [Formula: see text] color systems. Two moisture conditions (green and 50%) and two grain patterns (flat and quarter) of boards were analyzed through the application of different steaming times (0, 3, 6, 9, 12, 15 and 18[Formula: see text]h). The FTIR results showed that the bands at 1158, 1231, 1373 and 1419[Formula: see text]cm[Formula: see text] did not show any change with steaming, whereas the bands at 1053, 1108, 1453, 1506, 1536, 1558, 1595, 1652, 1683, 1700 and 1733[Formula: see text]cm[Formula: see text] presented a decrease in the intensity with the steaming time. The band at 1318[Formula: see text]cm[Formula: see text] was the only one that increased. Lightness ([Formula: see text]) was the most affected parameter, followed by yellowness ([Formula: see text]), while redness ([Formula: see text]) showed the smallest change. Surface color change ([Formula: see text]) presented the lowest value between 3[Formula: see text]h and 6[Formula: see text]h of steam-drying in the boards with flat grain, whereas for boards with quarter grain, the smallest [Formula: see text] value was obtained after 18[Formula: see text]h of steaming.

Dislocations in Norway spruce fibres and their effect on properties of pulp and paper

Holzforschung ◽  
2005 ◽  
Vol 59 (2) ◽  
pp. 163-169 ◽  
Author(s):  
Nasko Terziev ◽  
Geoffrey Daniel ◽  
Ann Marklund
Keyword(s):  
Mechanical Properties ◽  
Moisture Content ◽  
Norway Spruce ◽  
Juvenile Wood ◽  
Practical Importance ◽  
Pulp And Paper ◽  
Worst Case ◽  
Machine Failure ◽  
Wood Fibres ◽  
Control Samples

Abstract Wood “cell-wall deformation” is a comprehensive term describing any physical dislocation in the wall caused by mechanical forces. The development and effect of fibre dislocations on wood fibres, and their ultimate impact on the mechanical properties of paper remain rather obscure and controversial. Dislocations are difficult to quantify through a lack of defined measurable features, and research is aggravated by the inherent difficulties of applying statistical tools. A direct approach for studying the effect of dislocations on the mechanical properties of paper was used in this study. Dislocations in fibre cell walls were introduced by exposing whole wood fibres in mature and juvenile wood samples to compression stress. Sapwood samples of Norway spruce (Picea abies Karst.) were loaded by compression to their ultimate strength using an Alwetron-50 universal testing machine. Failure of samples conditioned to a moisture content of 9–15% always occurred in an oblique (relative to the fibre axis) plane and all fibres in the plane were deformed. When samples were loaded in a wet condition (i.e., moisture content close to the fibre saturation point), failure occurred at one end of the samples, resulting in highly disorganised fibres. Pulp and paper from the compressed fibres were produced and the mechanical properties of the paper were tested. Results of the mechanical tests were compared statistically to results derived from paper made from matched non-compressed control samples. Morphological features of fibres and dislocations after compression failure were characterised using microscopy (scanning electron microscopy, polarised light) on the whole wood and macerated fibres before and after paper testing. The above experimental approach showed that paper made from control samples had significantly better mechanical properties than paper made from samples loaded by compression under dry or wet conditions. At a tensile index of 90 N m/g, the tear index was measured as 23.6 mN m2/g for controls, while the corresponding values for compressed wet wood samples was 12.6 and 16.3 mN m2/g for samples at 9–15% moisture content. Paper made from juvenile wood also showed lower mechanical properties compared to controls. The results prove the negative effect of dislocations on the mechanical properties of paper in the worst case scenario and are of practical importance.

Drying of Rough Rice in Oven: An Experimental Study

2015 ◽  
Vol 365 ◽  
pp. 77-81 ◽  
Author(s):  
J.V. Silva ◽  
E.M.A. Pereira ◽  
T.H.F. Andrade ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Experimental Study ◽  
Relative Humidity ◽  
Moisture Content ◽  
Product Quality ◽  
Air Temperature ◽  
Drying Rate ◽  
Rough Rice ◽  
Drying Conditions ◽  
Kinetics Of ◽  
Mechanical Movement

This paper aims to present an experimental study of rough rice (BRSMG CONAI cultivar) drying by using a stationary method. The grain was dried in an oven with air mechanical movement under controlled conditions of velocity, temperature and relative humidity. In order to obtain balanced moisture content, the samples studied were kept at 40 and 70°C. Results of the drying and heating kinetics of the grain during the process are shown and analyzed. It was found that higher drying rate and lower time for drying as higher air temperature (70°C) is used. It can be concluded that the reduction of the moisture content of the grain, is considered very complex and, depending on the method and drying conditions, can substantially provokes breaking and cracks, which reduces final product quality.

scholarly journals Effect of Supercritical CO2 Drying on Moisture Transfer and Wood Property of Eucalyptus urophydis

Forests ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 1115
Author(s):  
Lin Yang ◽  
Honghai Liu
Keyword(s):  
Moisture Content ◽  
Supercritical Co2 ◽  
Moisture Transfer ◽  
Content Distribution ◽  
Wood Property ◽  
Drying Rate ◽  
Extractive Content ◽  
Moisture Content Distribution ◽  
Bordered Pits ◽  
Supercritical Co2 Drying

Wood dried using supercritical CO2 has unique properties because water is removed directly from the cell lumens through the cycling between supercritical and gas phases. Eucalyptus urophydis green wood was dried by supercritical CO2 at 50 °C and pressure of 10, 20, and 30 MPa; the effect of supercritical CO2 drying on moisture content distribution and transfer, as well as the permeability and extractive content of the wood, was investigated. The results showed that the supercritical CO2 drying rate was high, showing the highest drying rate at 20 MPa and the lowest at 10 MPa. Drying rate increased with pressure below 20 MPa in this study; drying rate represented no positive relation to pressure over 20 Mpa. Moisture content distribution was more uneven in the low-pressure drying conditions and in the middle transverse section of the specimens. The moisture content gradient in tangential was greater than that in longitudinal, especially for the drying of 10 MPa, indicating that water was removed mainly in the former direction of wood. More extractives were removed from wood at higher pressure during supercritical CO2 drying. Bordered pits were broken up more at higher pressure conditions. The decreased extract yields and increased amount of opened bordered pits increased the permeability of the wood after supercritical CO2 drying.

Impact of Wood Variability on the Drying Rate at Different Moisture Content Levels

2011 ◽  
Vol 61 (6) ◽  
pp. 435-442 ◽  
Author(s):  
Adin Berberović ◽  
Michael R. Milota
Keyword(s):  
Moisture Content ◽  
Drying Rate

Study on Paper Electromagnetic Drying Rate

2013 ◽  
Vol 680 ◽  
pp. 356-359
Author(s):  
Zheng Shun Wang ◽  
Zhao Hui Zhen
Keyword(s):  
High Speed ◽  
Energy Crisis ◽  
Drying Rate ◽  
Paper Machine ◽  
Paper Drying ◽  
Developmental Potential ◽  
Toilet Paper ◽  
Drying Technology ◽  
Steam Drying ◽  
Special Meaning

Paper electromagnetic drying technology is a new paper drying technology different from traditional steam drying. Today, environmental pressure deteriorating, energy crisis approaching, doing researches on paper electromagnetic drying technology has a special meaning, especially to high speed toilet paper machine which is truly needed and has a vast developmental potential. This thesis is based on electromagnetic dryer and steam dryer study. And the changes measured in the experiment at diverse temperatures and quantities in the experiment has shown a higher efficiency of electromagnetic drying technology than conventional steam drying technology.

Sign in / Sign up

Export Citation Format

Share Document