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.

Application of Chitosan as a Barrier Coating on Coated Ivory Board

2012 ◽  
Vol 200 ◽  
pp. 180-185 ◽  
Author(s):  
Zhi Qiang Fang ◽  
Gang Chen ◽  
Yu Sha Liu ◽  
Xin Sheng Chai
Keyword(s):  
Water Vapor ◽  
Double Layer ◽  
Transmission Rate ◽  
Single Layer ◽  
Barrier Properties ◽  
Vapor Permeability ◽  
Oxygen Barrier ◽  
Coated Paper ◽  
Oxygen Transmission Rate ◽  
Coating Weight

Chitosan solution was applied to coated ivory board as a barrier material, and the surface microstructure, oxygen resistance and water vapor permeability of chitosan-coated paper under different coating weight were studied. According to the images of scanning electron microscope(SEM) and Atomic force microscope(AFM), the coated ivory board surface has a smooth contour without pores and cracks after coating with chitosan. Increasing in coating hold-out of chitosan, the smoothness and the oxygen barrier properties of coated paper were improved considerably, but no improvement on water vapor resistance. An Oxygen transmission rate (OTR) of 119.0 cm3/m2•24h•0.1MPa was obtained when the coating weight of chitosan was 3.96 g/m2. Single-layer and double-layer techniques were used to coat coated ivory paper with chitosan; it was found that the OTR of paper, obtaining by double-layer coating technique, was lower than that of single-layer paper at similar coating weight. For the purpose of reducing water vapor transmission rate (WVTR) of chitosan-coated paper, Poly(vinyldene chloride)(PVDC) was applied on the chitosan-coated paper. Water vapor and oxygen barrier properties were enhanced as the coating weight of PVDC increased from 1.05 g/m2to 7.40 g/m2. While the chitosan and PVDC was coated on coated ivory paper through bi-layer technique for 1.96 g/m2and 7.40g/m2, respectively, the WVTR and OTR of paper decreased by 66.3% and 98.0% separately, compared to that of the chitosan-coated paper for 1.96g/m2.

Use of spherical silica particles to improve the barrier performance of coated paper

2019 ◽  
Vol 34 (3) ◽  
pp. 334-342 ◽  
Author(s):  
Mathew J. Cairns ◽  
Beko Mesic ◽  
James H. Johnston ◽  
Matthias B. Herzog
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Silica Particles ◽  
Filler Materials ◽  
Coated Paper ◽  
Water Vapour Transmission Rate ◽  
Spherical Silica ◽  
Spherical Silica Particles ◽  
Coating Formulation

Abstract The use of clay filler materials in dispersion coatings is a well-established method to provide improved barrier properties to the coated paper substrate, in particular lowering the water vapour transmission rate (WVTR) through the coating. In this paper we demonstrate the use of small spherical silica particles (∼100–220 nm) as an additive to a clay-latex coating formulation is able to provide further improvements to the barrier properties, when compared to the equivalent silica-free coatings. A significant decrease in both the water vapour transmission rate and the direct water uptake of water ({\text{Cobb}_{120}} wettability test) is observed for coatings containing as little as 1 % silica additive.

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.

Hydrophobicity of Beeswax-Chitosan Latex Coated Paper

2014 ◽  
Vol 936 ◽  
pp. 1077-1081 ◽  
Author(s):  
Wei Wei Zhang ◽  
Li Ying Qian ◽  
Hui Ning Xiao
Keyword(s):  
Water Vapour ◽  
Coating Layer ◽  
Transmission Rate ◽  
Water Repellency ◽  
Barrier Properties ◽  
Coated Paper ◽  
Water Contact ◽  
Drying Temperature ◽  
Water Vapour Transmission Rate ◽  
Water Vapour Barrier

Both water repellency and water vapour barrier properties were endowed at paper surface by coating with beeswax-chitosan latex. It was found that the water vapour transmission rate of coated paper decreased as the drying temperature increased. However, water contact angle was not affected with it. Although the surface morphology deformed at high drying temperature, the roughness values maintained at micro-scale. Further analysis indicated that the water vapour barrier property of coated paper was influenced by the density of the coating layer.

scholarly journals Fundamental Investigations Regarding Barrier Properties of Grafted PVOH Layers

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Markus Schmid ◽  
Andreas Benz ◽  
Camelia Stinga ◽  
Daniel Samain ◽  
Klaus Peter Zeyer
Keyword(s):  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Temperature Reaction ◽  
Angle Measurements ◽  
Water Vapour Transmission Rate ◽  
Contact Angle Measurements ◽  
Different Types ◽  
Transfer Method ◽  
Water Vapour Barrier

The current work focuses on fundamental investigations regarding the barrier properties of grafted PVOH layers produced by the Transfer Method. The layers (or papers) used for the different experiments were produced and grafted during the course of this work. Papers with different types of PVOH (different Mowiol types) were produced by coating. Experiments using different parameters (temperature, reaction duration, and concentration) were performed using the Transfer Method. Contact angle measurements and Cobb60measurements were carried out on the grafted and untreated PVOH layers. Furthermore, the water vapour transmission rate of the PVOH layers was determined. The results of this work showed that the method of chromatogeny or chromatogenic chemistry improves the water vapour barrier properties of grafted PVOH layers enormously.

scholarly journals Application of acrylic-based coatings for concrete protection

2018 ◽  
Vol 163 ◽  
pp. 05011
Author(s):  
Aleksander Kozak
Keyword(s):  
Carbon Dioxide ◽  
Water Vapour ◽  
Barrier Properties ◽  
Test Results ◽  
Coating Technology ◽  
Vapour Permeability ◽  
Coating Performance ◽  
Artificial Weathering ◽  
Current Trends ◽  
Acrylic Coatings

The paper presents a description of acrylic-based polymers used in civil engineering for concrete protection. Some information on chemistry and properties of the acrylic coatings is included together with current trends in coating technology. Moreover, the paper shows test results, that is barrier properties and SEM observations of a commercial elastic acrylic-based polymer subject to artificial weathering for 1000h. The studies showed that the weathering did not change carbon dioxide permeability of the tested coating and its influence on water vapour permeability of the material was also very small. The test results show that an assessment of coating performance based only on barrier properties is not enough.

Permeability and Porosity on Lightweight Mortars Fabricated with Polyamide Powder Wastes

2013 ◽  
Vol 687 ◽  
pp. 527-531 ◽  
Author(s):  
Jesús Gadea ◽  
Miguel Angel Salas ◽  
Sara Gutiérrez-González ◽  
A. Rodríguez ◽  
Matthieu Horgnies ◽  
...  
Keyword(s):  
Water Vapour ◽  
Total Porosity ◽  
Progressive Increase ◽  
Water Vapour Permeability ◽  
Vapor Permeability ◽  
Vapour Permeability ◽  
Hardened State ◽  
Polyamide Powder ◽  
Masonry Mortar

This paper presents the results obtained in the production of lightweight mortars where different amounts of sand were replaced by polyamide powder wastes. The characterization of the materials obtained was carried out in fresh and hardened state, considering especially the vapor permeability and micro and macroporosity properties. It has been found that the progressive increase of polymer influences the behavior of the mortar, increasing the water vapour permeability as well as the total porosity of the material, which carried on a decrease in the density of the composites fabricated. These results suggest the employment of polyamide powder residue as sand could be useful with the aim of manufacture recycled lightweight masonry mortar.

Preparation of Degradable Sago Starch Film Incorporated with Zinc Oxide (ZnO) Nanoparticles for Enhanced Chemical Barrier and Mechanical Properties

2018 ◽  
Vol 792 ◽  
pp. 104-110
Author(s):  
Jasmine Sim Pei Chieh ◽  
Bazlul Mobin Siddique
Keyword(s):  
Mechanical Strength ◽  
Zno Nanoparticles ◽  
High Surface ◽  
Barrier Properties ◽  
Nanocomposite Films ◽  
Sago Starch ◽  
Vapour Permeability ◽  
High Mechanical Strength ◽  
Casting Technique ◽  
Solution Casting Technique

The main objective of this study is to reinforce the mechanical strength and water resistance abilities of sago starch biopolymer by incorporating ZnO nanofillers. The biopolymer based nanocomposite films were cast utilizing different weight percentages of ZnO nanofillers (0, 1, 3 or 5 wt%) in sago starch matrix through solution casting technique. Uniform dispersing of ZnO nanofillers throughout the sago starch matrix was achieved by sonication and also to prevent the formation of ZnO nanoparticles aggregates. This was to further reinforce the chemical barrier properties of the film The results illustrated that with the increase of loading of ZnO nanoparticles from 0 to 5 wt%, the tensile strength and elastic modulus improved from 0.180 to 0.980 MPa and from 3.410 to 6.401 MPa respectively for the films, attributing to the high surface to volume ratios, the high mechanical strength of ZnO nanoparticles and the strong nanofiller-matrix interfacial adhesion. The elongation at break also enhanced owing to the slippage of ZnO nanofillers and the oriented sago starch polymer which activated the shear flow of the sago starch polymer. Sago starch nanocomposites with ZnO loadings varied from 0 to 5 wt% demonstrated decreased water vapour permeability from 4.992 × 10−10 g m−1 s−1 Pa−1 to 2.723 × 10−10 g m−1 s−1 Pa−1.

scholarly journals Effect of the Addition of Essential Oils and Functional Extracts of Clove on Physicochemical Properties of Chitosan-Based Films

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Paola Reyes-Chaparro ◽  
Nestor Gutierrez-Mendez ◽  
Erika Salas-Muñoz ◽  
Juan Guillermo Ayala-Soto ◽  
David Chavez-Flores ◽  
...  
Keyword(s):  
Essential Oils ◽  
Water Vapour ◽  
Chitosan Film ◽  
Barrier Properties ◽  
Vapour Permeability ◽  
Force Microscopy ◽  
Atomic Force ◽  
Control Film ◽  
Chitosan Films ◽  
Positive Effect

Mechanical and barrier properties of chitosan films prepared with essential oils of clove and functional extract were studied. The films made with functional extracts (esters E6and E7) presented the significant increment of extensibility compared with the untreated chitosan films. In the case of punction test, the films made with the esters E6and E7resisted more the applied strength before tearing up compared with the chitosan control film (without any treatment). Thermogravimetric analysis values were determined for the chitosan control film and chitosan film treated with clove essential oil obtaining 112.17°C and 176.73°C, respectively. Atomic force microscopy (AFM) was used to determine their morphology by analyzing their surfaces and phase arrangement; AFM was also used to observe the porosity in chitosan-based antimicrobial films and the chitosan films incorporating functional extracts. The water vapour permeability (WVP) data showed that incorporating the functional extract to the formulation of films has a positive effect on water vapour barrier properties. In general, the incorporation of essential oils and functional extract of clove at 20% in chitosan films caused microstructural changes that were dependent on the different affinity of components.

scholarly journals Biodegradable Alginate Films with ZnO Nanoparticles and Citronella Essential Oil—A Novel Antimicrobial Structure

Pharmaceutics ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1020
Author(s):  
Ludmila Motelica ◽  
Denisa Ficai ◽  
Ovidiu Oprea ◽  
Anton Ficai ◽  
Roxana-Doina Trusca ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Essential Oil ◽  
Bacillus Cereus ◽  
Shelf Life ◽  
Zno Nanoparticles ◽  
Uv Light ◽  
Water Vapor Permeability ◽  
Barrier Properties ◽  
Vapor Permeability ◽  
Bacterial Strains

The petroleum-based materials could be replaced, at least partially, by biodegradable packaging. Adding antimicrobial activity to the new packaging materials can also help improve the shelf life of food and diminish the spoilage. The objective of this research was to obtain a novel antibacterial packaging, based on alginate as biodegradable polymer. The antibacterial activity was induced to the alginate films by adding various amounts of ZnO nanoparticles loaded with citronella (lemongrass) essential oil (CEO). The obtained films were characterized, and antibacterial activity was tested against two Gram-negative (Escherichia coli and Salmonella Typhi) and two Gram-positive (Bacillus cereus and Staphylococcus aureus) bacterial strains. The results suggest the existence of synergy between antibacterial activities of ZnO and CEO against all tested bacterial strains. The obtained films have a good antibacterial coverage, being efficient against several pathogens, the best results being obtained against Bacillus cereus. In addition, the films presented better UV light barrier properties and lower water vapor permeability (WVP) when compared with a simple alginate film. The preliminary tests indicate that the alginate films with ZnO nanoparticles and CEO can be used to successfully preserve the cheese. Therefore, our research evidences the feasibility of using alginate/ZnO/CEO films as antibacterial packaging for cheese in order to extend its shelf life.

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