scholarly journals Comparison of the Morphological and Physical Properties of Different Absorbent Wound Dressings

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Sukhontha Hasatsri ◽  
Anuphap Pitiratanaworanat ◽  
Suwit Swangwit ◽  
Chadaporn Boochakul ◽  
Chamaipond Tragoonsupachai
Keyword(s):  
Physical Properties ◽  
Sodium Alginate ◽  
Water Vapour ◽  
Transmission Rate ◽  
Wound Dressings ◽  
Original Structure ◽  
Absorption Properties ◽  
Vapour Permeability ◽  
Polyurethane Film ◽  
Film Layer

Good quality wound dressings should have exceptional properties for usage, such as being able to remove excess wound exudates, having rapid dehydration, and providing optimal water vapour permeability. This study evaluated and compared the morphological and physical properties of six different commercially absorbent wound dressings in Thailand: two hydrocolloids, two alginates, and two foams. These wound dressings are available in a variety of components and structures, some of which have a multilayer structure. The results showed that the calcium sodium alginate dressings had better absorption properties than the calcium alginate dressings, hydrocolloid dressings, hydrocolloid with foam layer dressings, foam with polyurethane film layer dressings, and foam with hydrogel and polyurethane film layer dressings. Furthermore, the calcium sodium alginate dressings had the highest rate of dehydration and provided an optimal water vapour transmission rate. However, the calcium sodium alginate dressings could not retain the original structure after being submerged with a wound exudate.

The preclinical evaluation of the water vapour transmission rate through burn wound dressings

Biomaterials ◽  
1987 ◽  
Vol 8 (5) ◽  
pp. 367-371 ◽  
Author(s):  
D Queen ◽  
J.D.S Gaylor ◽  
J.H Evans ◽  
J.M Courtney ◽  
W.H Reid
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Wound Dressings ◽  
Burn Wound ◽  
Preclinical Evaluation ◽  
Water Vapour Transmission Rate

scholarly journals Design of Chitosan and Alginate Emulsion-Based Formulations for the Production of Monolayer Crosslinked Edible Films and Coatings

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1654
Author(s):  
Tiago M. Vieira ◽  
Margarida Moldão-Martins ◽  
Vítor D. Alves
Keyword(s):  
Sodium Alginate ◽  
Water Vapour ◽  
Chitosan Film ◽  
Tensile Tests ◽  
Edible Films ◽  
Vapour Permeability ◽  
Hydrophobic Barrier ◽  
Colour Parameters ◽  
Chitosan Films ◽  
Crosslinking Agents

This study aimed to develop edible monolayer emulsion-based barriers with polysaccharides as film-forming components (chitosan and sodium alginate), soy lecithin as a surfactant and olive oil as a hydrophobic barrier. Monolayer barriers in the form of films were prepared by casting filmogenic emulsions composed of 2% w/v chitosan (dissolved in lactic acid 1% v/v) or 1% w/v sodium alginate, with different lipid contents (25, 50 and 100% w/w biopolymer basis) and different surfactant concentrations (5, 10 and 25% w/w, lipid basis). Glycerol was used as a plasticizer (25 % w/w, biopolymer basis). After the emulsion drying process, the obtained stand-alone films were sprayed with a crosslinking solution, achieving an optimized crosslinker content of 3.2 mgCa2+/cm2 alginate film and 4 mg tripolyphosphate/cm2 chitosan film. The effect of oil and lecithin contents, as well the presence of crosslinking agents, on the film’s water vapour permeability (WVP), water vapour sorption capacity, mechanical properties and colour parameters, was evaluated. The results have shown that the lowest WVP values were obtained with formulations containing 25% lipid and 25% surfactant for chitosan films, and 100% lipid and 25% surfactant for alginate films. The application of the crosslinking agents decreased even further the WVP, especially for chitosan films (by 30%). Crosslinking also increased films’ resistance to deformation under tensile tests. Overall, the films developed present a good potential as polysaccharide-based barriers with increased resistance to water, which envisages the use of the designed formulations to produce either edible/biodegradable films or edible coatings.

scholarly journals The influence of PCL-ZnO coating composition on coated offset cardboard prints

2020 ◽  
Author(s):  
Tomislav Cigula ◽  
◽  
Tomislav Hudika ◽  
Mihael Katana ◽  
Marina Golik Krizmanić ◽  
...  
Keyword(s):  
Water Vapour ◽  
Zno Nanoparticles ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Vapor Permeability ◽  
Colour Difference ◽  
Coated Paper ◽  
Vapour Permeability ◽  
Target Values ◽  
Uncoated Paper

The most significant printing branch in these days is packaging printing. Packaging must primarily preserve the product from damaging, but at the same time must attract the consumers to be picked up from the shelf in the store. To ensure protective and aesthetic role of the packaging the prints are commonly coated with varnishes which will improve visual, mechanical, surface, and optical properties. In this paper a coating composed of polycaprolactone (PCL) and nanoscale ZnO was used to coat the offset prints on the cardboard. The coatings were prepared by adding various weight amounts of the ZnO nanoparticles (weight ratios of 0.1, 0.5 and 1%) into the mixture of PCL and ethyl-acetate. The coatings were applied onto prepared offset prints. The prints were evaluated before and after coating process by determining colour coordinates, print gloss, water vapour permeability and by calculating colour difference. The results showed that on the uncoated paper coating with prepared OVPs did not affect the colour reproduction outside acceptable tolerance levels, except for magenta coated with w(ZnO) = 0.5 and 1%. The coating with prepared coatings caused almost none change of print gloss on uncoated paper, but increased the print gloss on coated paper. The water-vapor permeability was lowered on both investigated paper types but on the uncoated paper the addition of ZnO nanoparticles decreased barrier properties in comparison to the coating composed of only PCL. Increasing the mass of added ZnO increases barrier properties of the print on both investigated cardboards. To conclude, this research has proved applicability of the PCL-ZnO coatings as a OVP on cardboard offset prints as it did not highly influenced colour reproduction but had decreased water vapour transmission rate. On the coated paper/cardboard one must take into account the increased colour difference of magenta and chose the ink to be closer to the target values at the beginning. In addition, to further investigate applicability in the packaging printing, further research should include investigation of resistance to ink fading in the ageing process, bending tests, adhesion etc.

scholarly journals Development and Assessment of Duplex and Triplex Laminated Edible Films Using Whey Protein Isolate, Gelatin and Sodium Alginate

2020 ◽  
Vol 21 (7) ◽  
pp. 2486 ◽  
Author(s):  
Andrey A. Tyuftin ◽  
Lizhe Wang ◽  
Mark A.E. Auty ◽  
Joe P. Kerry
Keyword(s):  
Sodium Alginate ◽  
Whey Protein ◽  
Water Vapour ◽  
Corn Oil ◽  
Barrier Properties ◽  
Break Point ◽  
Whey Protein Isolate ◽  
Edible Films ◽  
Protein Isolate ◽  
Vapour Permeability

The objective of this study was to assess the ability of producing laminated edible films manufactured using the following proteins; gelatin (G), whey protein isolate (WPI) and polysaccharide sodium alginate (SA), and to evaluate their physical properties. Additionally, films’ preparation employing these ingredients was optimized through the addition of corn oil (O). Overall, 8-types of laminated films (G-SA, G-WPI, SA-WPI, SA-G-WPI, GO-SAO, GO-WPIO, SAO-WPIO and SAO-GO-WPIO) were developed in this study. The properties of the prepared films were characterized through the measurement of tensile strength (TS), elongation at break point (EB), puncture resistance (PR), tear strength (TT), water vapour permeability (WVP) and oxygen permeability (OP). The microstructure of cross-sections of laminated films was investigated by scanning electron microscopy (SEM). Mechanical properties of films were dramatically enhanced through the addition of film layers. GO-SAO laminate showed the best barrier properties to water vapour (22.6 ± 4.04 g mm/kPa d m2) and oxygen (18.2 ± 8.70 cm3 mm/kPa d m2). SAO-GO-WPIO laminate film was the strongest of all laminated films tested, having the highest TS of 55.77 MPa, PR of 41.36 N and TT of 27.32 N. SA-G-WPI film possessed the highest elasticity with an EB value of 17.4%.

scholarly journals PENGARUH PENAMBAHAN JUMLAH PIGMEN PADA LAPISAN DASAR (BASE COAT) PADA PROSES FINISHING TERHADAP SIFAT FISIK KULIT SAPI

2017 ◽  
Vol 41 (3) ◽  
pp. 307
Author(s):  
Gresy Griyanitasari
Keyword(s):  
Physical Properties ◽  
Water Absorption ◽  
Water Vapour ◽  
Coating Thickness ◽  
Water Vapour Permeability ◽  
High Quality ◽  
Vapour Permeability ◽  
Performance Requirements ◽  
Dry Water

ABSTRAKPermintaan kulit yang bermutu semakin meningkat  tetapi ketersediaannya semakin menurun. Teknologi pasca penyamakan (finishing) merupakan hal yang dapat dilakukan untuk menutupi kerusakan kulit. Salah satu bahan finishing kulit yang dapat digunakan untuk menutupi cacat kulit adalah pigmen. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan jumlah pigmen pada lapisan dasar terhadap sifat fisik kulit tersamak. Kulit sapi yang sudah disamak ulang diberi perlakuan finishing dengan variasi pigmen 7,5; 10; 12,5; 15; dan 17,5% pada lapisan dasar. Hasil penelitian menunjukkan bahwa pigmen berpengaruh pada penyerapan air selama dua jam dan ketebalan lapisan finishing. Formulasi dengan berbagai variasi pigmen dalam penelitian ini memenuhi standard SNI 0234: 2009 Kulit Bagian Atas Alas Kaki-Kulit Boks dan ISO 20879: 2007 Footwear performance requirements for footwear-upper dari segi ketahanan gosok cat (kering dan basah), penyerapan air (2 dan 24 jam), dan permeabilitas uap air..(Kata kunci: “finishing, kulit sapi, pigmen, permeabilitas uap air”) ABSTRACTThe demand of high quality leather was increasing, but it’s availability was decrease. Finishing was technology to upgrade the quality of leather. Pigment  was one of the materials for finishing leather that can correcting grain. The aim of this research was to determine the best variation in addition of pigment as base coat on leather physical properties. Retanned cow leather was finished with 7,5; 10; 12,5; 15; and 17,5% of pigment as base coat. This study revealed pigment, as one of basecoat material, affected not only water absorption for two hous but also leather coating thickness. Finishing formulation used to finish leather, with pigment included, was met the requirements of  SNI 0234: 2009 Kulit Bagian Atas Alas Kaki-Kulit Boks dan ISO 20879: 2007 Footwear performance requirements for footwear-upper for rub fastness (wet and dry), water absorption (2 and 24 hours), and water vapour permeability.  (Keywords: “finishing, cow leather, pigment, water vapour permeability”)

Effect of Test Methods on Apparent Moisture Vapour Transmission of P/V and P/C Fabrics

2014 ◽  
Vol 18 (1) ◽  
pp. 71-79
Author(s):  
Subhasis Das ◽  
V. K. Kothari
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Test Methods ◽  
Test Method ◽  
Transport Rate ◽  
Vapour Transport ◽  
Vapour Permeability ◽  
Water Vapour Transport ◽  
Moisture Vapour

The moisture vapour permeability properties of a series of almost similar polyesterviscose (P/V) and polyester-cotton (P/C) blended fabrics are investigated. The water vapour transport rate greatly differs depending on the principle of the test methods, even when other parameters are nearly identical, such as air permeability, areal density, porosity and thickness. The water absorption characteristics of fibre seem to be the most important in determining the overall water vapour transport rate. Substitution of polyester for viscose and cotton in P/V and P/C blended fabrics respectively, reduces the water transport rate of the fabrics in a long term method. It is found that the P/C blended fabrics show greater water vapour transport than the corresponding P/V fabrics when a long term test method is used; however, the P/V fabrics show relatively higher water vapour permeability than the P/C fabrics when short duration tests are carried out by using the Permetest and moisture vapour transmission rate (MVTR) cell methods

scholarly journals Enhancement of Waterproofing Properties of Finished Upper Leather Produced from Bangladeshi Cow Hides

2019 ◽  
Vol 4 (7) ◽  
pp. 63-71
Author(s):  
Abrar Shahriar ◽  
Fatema-Tuj- Zohra ◽  
A.B.M. Wahid Murad ◽  
Sobur Ahmed
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Physical Properties ◽  
Water Vapour ◽  
Physical Characteristic ◽  
Vapour Permeability ◽  
Minimum Requirement ◽  
Standard Methods ◽  
Sem Image ◽  
Scanning Electron

Waterproofness property of leather can be enhanced by modifying different steps involved in pre-tanning to finishing operations. In this study three sets of experiment were conducted where tanning and finishing techniques differed to analyze the improvement of the waterproofness property. Use of surfactants and hydrophilic agents were avoided to improve this property. Moreover, different waterproof fatliquors were used and changing of the finishes in each experiment was performed to improve and evaluate the waterproofness of leathers. Waterproofness and other physical characteristic properties were assessed following standard methods. Leather samples of experiment-3 where extensive finishing was done, showed the best result of waterproofness which is significantly higher than the minimum requirement of shoe upper leather. All other physical properties except water vapour permeability of leather samples of experiment-3 were excellent as compared to other experiments. Scanning Electron Microscopy (SEM) image of the leather sample was also analyzed. 

scholarly journals Organosolv Lignin Barrier Paper Coatings from Waste Biomass Resources

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4443
Author(s):  
Gregor Lavrič ◽  
Aleksandra Zamljen ◽  
Janja Juhant Grkman ◽  
Edita Jasiukaitytė-Grojzdek ◽  
Miha Grilc ◽  
...  
Keyword(s):  
Contact Angle ◽  
Water Vapour ◽  
Transmission Rate ◽  
Average Molecular Weight ◽  
Barrier Properties ◽  
Hydroxyl Groups ◽  
Coating Materials ◽  
Vapour Permeability ◽  
Reynoutria Japonica ◽  
Significant Difference

The aim of the study was to isolate lignin from organosolv, beech tree (Fagus sylvatica), and Japanese knotweed (Reynoutria japonica), to use it for paper surface and to replace part of the non-renewable product resources with bio-based ones. A total of nine coated samples with different lignin formulations and starch were compounded, prepared, and evaluated. The basic (grammage, thickness, specific density), mechanical (elongation at break, tensile, burst and tear indices), and barrier properties (contact angle, water penetration, water vapour permeability, kit test) of the coated papers were investigated. The analysis showed no significant difference in tensile properties between uncoated and coated samples. Furthermore, the decrease in water vapour transmission rate and the lower contact angle for coated samples were nevertheless confirmed. The novel coating materials show promising products with very good barrier properties. Finally, the correlation between structural, morphological, and (other) natural lignin-based factors was revealed, highlighting the importance of parameters such as the equivalence ratio of aliphatic and phenolic hydroxyl groups or the average molecular weight. Tuning functionality by design could optimise performance in the future.

scholarly journals Chitosan-Zinc Oxide Composite for Active Food Packaging Applications

2018 ◽  
Vol 7 (4.30) ◽  
pp. 253 ◽  
Author(s):  
S.R. Abdul Razak ◽  
H. Basri
Keyword(s):  
Contact Angle ◽  
Zinc Oxide ◽  
Water Vapour ◽  
Food Packaging ◽  
Transmission Rate ◽  
Chitosan Film ◽  
Zno Films ◽  
One Pot ◽  
Vapour Permeability ◽  
Active Food Packaging

Chitosan-zinc oxide (C-ZnO) films were prepared by a simple one pot procedure. In order to investigate the property of C-ZnO films, two composite films were prepared by varying the loading of ZnO and compared with pure chitosan film (C). The films were characterized by various techniques such as FTIR, DSC, tensile, contact angle and water vapour permeability. FTIR analysis showed changes in hydrogen bonds band at 3351 cm-1 compared to pure chitosan film. The incorporation of ZnO in chitosan films increased the contact angle by 30.5% in C-ZnO1.0 film while water vapour transmission rate decreased by 7.8% compared to C film. From the tensile test, C-ZnO0.5 and C-ZnO1.0 films were found to be much superior by 1.5 times and 2.5 times respectively compared to bare chitosan film. Larger inhibition ring (by 47%) was exhibited by C-ZnO1.0 as compared to C-ZnO0.5 when tested against S.aureus. From the results, it is displayed that the incorporation of zinc oxide to chitosan improve their properties which also shown the potential to become a candidate for food active packaging.

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