Moisture diffusivities evaluated at high moisture levels from a series of water absorption tests

10.1617/13645 ◽  
2005 ◽  
Vol 35 (247) ◽  
Author(s):  
M. Janz
Keyword(s):  
Water Absorption ◽  
High Moisture

Effects of Alkaline Treatments on the Tensile Strength of Napier Grass Fibres

2014 ◽  
Vol 695 ◽  
pp. 340-343 ◽  
Author(s):  
J.A. M. Haameem ◽  
M.S. Abdul Majid ◽  
M. Haslan ◽  
Mohd Afendi ◽  
E.A. Helmi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Tensile Strength ◽  
Tensile Test ◽  
Water Absorption ◽  
Chemical Treatment ◽  
Moisture Absorption ◽  
Single Fibre ◽  
Napier Grass ◽  
High Moisture ◽  
The Poor

This paper presents the experiment test of the Napier grass fibres to determine the tensile strength of the Napier grass fibre. . Napier grass fibre is a natural source of fibre which is extracted from the internodes of Napier grass stems. Napier grass fibres were extracted trough conventional water retting process. However, the main disadvantages of natural fibres in composites are the poor compatibility between fibre and matrix and the relative high moisture absorption. These Napier grass fibre then undergoes alkaline chemical treatment using sodium hydroxide (NaOH) to improve the surface roughness and to minimize the water absorption into the cellulose. The treatment is conducted with different concentration of NaOH at 5%, 10%, 15% and 20% respectively. The single fibre tensile test was conducted using Instron micro tester. Based on the tests conducted, the results show that the fibre treated 10% concentrations yield the strongest tensile test compared to untreated Napier grass fibre.

scholarly journals Ionogenic gel-forming (co)polymers of N-vinyl succinimide, N-vinylsuccinamic and acrylic acids grafted on starch

2020 ◽  
pp. 8-11
Author(s):  
L. I. Shal’nova ◽  
N. A. Lavrov
Keyword(s):  
Gamma Irradiation ◽  
Water Absorption ◽  
Bioactive Compounds ◽  
Moisture Absorption ◽  
Redox System ◽  
Sorption Properties ◽  
Polymerization Process ◽  
Prolonged Release ◽  
High Moisture ◽  
Acrylic Acids

Gel-forming (co)polymers of N-vinylsuccinimide, N-vinylsuccinamic and acrylic acids grafted on starch were obtained using an initiating redox system or as a result of 60Co gamma irradiation. The dependence of the level of sorption properties (co)of polymers relative to bioactive compounds (BAC), their water absorption and swelling on the conditions of the (co) polymerization process has been determined. The ability of composite copolymers to high moisture absorption, binding and prolonged release of BAC and the possibility of their use for biomedical purposes has been established.

Effect of ink and paperboard characteristics on flexographic print quality based on print density

TAPPI Journal ◽  
2011 ◽  
Vol 10 (9) ◽  
pp. 7-13
Author(s):  
KHODADAD MALMIRCHEGINI ◽  
FARSHAD SARKHOSH RAHMANI
Keyword(s):  
Water Absorption ◽  
Significant Influence ◽  
Particle Diameter ◽  
Print Quality ◽  
Printing Technology ◽  
Plastic Films ◽  
Printing Inks ◽  
Packaging Industry ◽  
Solids Content ◽  
Density Results

Flexography is an evolving printing technology that is suitable for printing on coated and uncoated paperboard and board, nonporous substrates including metalized and paperboard foils, and plastic films used especially in the packaging industry. This study evaluated the effect of paperboard and ink characteristics on flexographic print density in paperboard. Three commercial paperboards from different companies were prepared: brown kraft from Thailand, white kraft from Spain, and test liner from Iran. Four samples of process print inks from Iran were used in this investigation. Paperboard properties, such as roughness and water absorption, and ink characteristics, including solids content, PH and particle diameter, were measured. The inks were printed on paperboards using a roll no.15 applicator with a blade metering device, and the print densities were measured. Results showed that solids content, pH, and particle diameter of printing inks influenced print density, while the roughness and water absorption of the three types of paperboard had no significant influence on print density. Results also illustrated that two levels of ink viscosity (25–30 and 50–55 mPa·s) were insignificant to print density.

Effects of Natural Fiber Reinforcement on Water Absorption of Compressed Stabilized Earth Blocks

2012 ◽  
Vol 2 (11) ◽  
pp. 165-167
Author(s):  
B.O .Ugwuishiwu B.O .Ugwuishiwu ◽  
◽  
B.O. Mama B.O. Mama ◽  
N. M Okoye N. M Okoye
Keyword(s):  
Water Absorption ◽  
Natural Fiber ◽  
Fiber Reinforcement ◽  
Earth Blocks

Influence of Water Absorption on The Selected Properties of Hemp Hurds Composites

2015 ◽  
Vol 10 (1) ◽  
pp. 123-132
Author(s):  
Lucia Kidalova ◽  
Nadezda Stevulova ◽  
Eva Terpakova
Keyword(s):  
Water Absorption ◽  
Influence Of Water

Drying kinetics of processed natural coffee with high moisture content

2017 ◽  
Vol 12 (3) ◽  
pp. 400 ◽  
Author(s):  
Valdiney Cambuy Siqueira ◽  
Flávio Meira Borém ◽  
Guilherme Euripedes Alves ◽  
Eder Pedroza Isquierdo ◽  
Afonso Celso Ferreira Pinto ◽  
...  
Keyword(s):  
Moisture Content ◽  
Drying Kinetics ◽  
High Moisture Content ◽  
High Moisture ◽  
Kinetics Of

Objetivou-se, com o presente trabalho, propor um novo método de processamento e secagem, assim como avaliar o comportamento dos grãos submetidos a este processo, por meio da taxa de redução de água e do ajuste de diferentes modelos matemáticos aos dados experimentais da secagem. Os frutos colhidos no estágio maduro foram divididos em três lotes. O primeiro foi seco continuamente à temperatura de 40±1 °C. O segundo consiste na secagem do café natural até os teores de água de 0,56±0,02, 0,41±0,02, 0,28±0,02 e 0,20±0,02 decimal (base seca, b.s.), seguido de beneficiamento e secagem contínua nas temperaturas de 35±1 ºC e 40±1 ºC. O terceiro lote correspondeu à secagem contínua do café descascado e desmucilado na temperatura de 40±1 °C. Em todos os lotes, a secagem foi encerrada quando os grãos atingiram o teor de água de 0,12±0,05 (b.s.). Aos dados experimentais da secagem foram ajustados dez modelos matemáticos utilizados para representação da secagem dos produtos agrícolas. Além da representação da cinética de secagem foi avaliada a taxa de redução de água dos grãos. Conclui-se que a taxa de redução de água é maior para a temperatura de secagem de 40±1 °C, especialmente para maiores teores de água. O tempo total de secagem do café beneficiado com alto teor de água é expressivamente reduzido, quando comparado ao tempo de secagem completa do café natural. O modelo de Midilli descreve satisfatoriamente a cinética de secagem do café beneficiado.

Formulation and Evaluation of Fast Disintigrating Meloxicam Tablets and Its Comparison with Marketed Product

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
Suresh Kulkarni ◽  
Ranjit P. ◽  
Nikunj Patel ◽  
Someshwara B. ◽  
Ramesh B. ◽  
...  
Keyword(s):  
Water Absorption ◽  
In Vitro Dissolution ◽  
Thickness Variation ◽  
Wet Granulation ◽  
Disintegration Time ◽  
Absorption Ratio ◽  
Wetting Time ◽  
Fast Disintegrating Tablets ◽  
Cox 1

The present investigation deals with the formulation of fast disintegrating tablets of Meloxicam that disintegrate in the oral cavity upon contact with saliva and there by improve therapeutic efficacy. Meloxicam is a newer selective COX-1 inhibitor. The tablets were prepared by wet granulation procedure. The influence of superdisintegrants, crosspovidone, croscaremellose sodium on disintegration time, wetting time and water absorption ratio were studied. Tablets were evaluated for weight and thickness variation, disintegration time, drug content, in vitro dissolution, wetting time and water absorption ratio. The in vitro disintegration time of the best fast disintegrating tablets was found to be 18 sec. Tablets containing crospovidone exhibit quick disintegration time than tablets containing croscaremellose sodium. The fast disintegrating tablets of Meloxicam with shorter disintegration time, acceptable taste and sufficient hardness could be prepared using crospovidone and other excipients at optimum concentration.

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