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.

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 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.

Lignin-containing coatings for packaging materials

2018 ◽  
Vol 33 (3) ◽  
pp. 548-556
Author(s):  
Asif Javed ◽  
Henrik Ullsten ◽  
Peter Rättö ◽  
Lars Järnström
Keyword(s):  
Transmission Rate ◽  
Crosslinking Agent ◽  
Barrier Properties ◽  
Water Stability ◽  
Packaging Materials ◽  
Ph Adjustment ◽  
Water Vapour Transmission Rate ◽  
Starch Films ◽  
Ammonium Zirconium Carbonate ◽  
Coating Formulation

Abstract The mechanical properties and chemical stability in water of self-supporting films made from aqueous solutions of starch and lignin, and the barrier properties of paperboard coated with solutions of these polymers have been studied. The dissolution of starch from the starch-lignin films in contact with the model liquids was decreased significantly when lignin was added to the starch films. The addition of ammonium zirconium carbonate (AZC) to the formulations as a crosslinking agent substantially increased the storage modulus of the starch-lignin films, which indicated that crosslinking had occurred. The addition of AZC to the formulations also led to a decrease in dissolution of both starch and lignin from the starch-lignin films in contact with model liquids. The effect of AZC on the water stability of the films was greater when the pH of the starch-lignin-AZC solution was adjusted with ammonia rather than NaOH. The addition of NH4Cl solution as a presumed catalyst to the recipe when the pH adjustment was performed with NaOH did not improve the effect of AZC on the water stability of the films. The water vapour transmission rate of the coated paperboard decreased slightly when AZC was added to the coating formulation.

scholarly journals Karakteristik Edible Film Pati Sagu Alami dan Pati Sagu Fosfat dengan Penambahan Gliserol (Characteristics of Edible Film from Native and Phosphate Sago Starches with the Addition of Glycerol)

2016 ◽  
Vol 36 (03) ◽  
pp. 247 ◽  
Author(s):  
Febby Jeanry Polnaya ◽  
La Ega ◽  
Devidson Wattimena
Keyword(s):  
Tensile Strength ◽  
Water Vapour ◽  
Transmission Rate ◽  
Barrier Properties ◽  
Edible Films ◽  
Edible Film ◽  
Glycerol Concentration ◽  
Sago Starch ◽  
Water Vapour Transmission Rate ◽  
Randomized Experimental Design

The purpose of this study was to evaluate the effect of the addition of several glycerol concentrations in the making of edible film from native and phosphate sago starch on physical, mechanical and barrier properties of the film. A completely randomized experimental design was applied in this study consisting of two factors of treatments, i.e.: native and phosphate sago starch, and the second factor was glycerol concentration with three levels of treatments, i.e.: 0.5, 1.0, and 1.5 % (w/w). The films were characterized for tensile strength, elongation, solubility, transparency, and water vapor transmission rate. Edible films have produced characteristics for tensile strength from 3.05 to 31.49 MPa, elongation from 3.03 to 20.94 %, solubility from 33.44 to 42.43 %, transparency from 0.59 to 4.14 %, and water vapour transmission rate from 7.76 to 15.80 g/m2.h. Glycerol was found to affect the increase of elongation, solubility, and water vapour transmission rate, as well as the decrease of its tensile strength and transparancy. The films made from sago starch phosphate showed to increase the solubility and to have significant effect compared with native sago starch, but not affecting the other properties. ABSTRAKTujuan penelitian ini adalah untuk mempelajari pengaruh penambahan beberapa konsentrasi gliserol pada pembuatan edible film dari pati sagu alami dan pati sagu fosfat terhadap sifat fisik, mekanik dan barrier film. Rancangan yang digunakan adalah rancangan acak lengkap yang terdiri dari dua faktor yaitu perlakuan jenis pati sagu dengan dua taraf perlakuan yaitu: pati sagu alami dan pati sagu fosfat dan tiga taraf konsentrasi gliserol yaitu: 0,5, 1,0 dan 1,5 % (b/b). Peubah yang diamati adalah tensile strength¸ elongasi, daya larut, transparansi, dan laju transmisi uap air. Karakteristik edible film yang dihasilkan meliputi tensile strength adalah 3,05 - 31,49 MPa, elongasi 3,03 - 20,94 %, daya larut 33,44 - 42,43 %, transparansi 0,59 - 4,14 %, dan laju transmisi uap air 7,76 - 15,80 g/m2.jam. Penambahan gliserol menyebabkan elongasi, daya larut, dan laju transmisi uap air meningkat, tetapi tensile strength dan transparansinya menurun. Perlakuan pati sagu fosfat hanya menyebabkan daya larut film meningkat, tetapi tidak untuk sifat-sifat film lainnya.Kata kunci: Edible film; gliserol; pati sagu alami; pati sagu fosfat

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