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Your search keyword '"Vähä-Nissi, Mika"' showing total 5 results
Start Over Author "Vähä-Nissi, Mika" Topic packaging material
5 results on '"Vähä-Nissi, Mika"'

1. Test Methods for Evaluating Grease and Mineral Oil Barriers

Author

Vähä-Nissi, Mika, Laine, Christiane, Rautkoski, Hille, Pitkänen, Marja, Vartiainen, Jari, Ohra-Aho, Taina, Sneck, Asko, Gestranius, Marie, and Ketoja, Jukka

Subjects
mineral oil, SDG 3 - Good Health and Well-being, packaging material, grease barrier, migration, testing
Abstract

Several standard or material specific methods for grease barrier testing are being used. Results are expressed either as the time in which a test liquid has penetrated through a packaging material or as the amount of liquid which has penetrated through the material during a certain time period. However, such tests are not accurate, and there was a need for a new and more quantitative test method. A new test method developed by integrating two previous standard methods will be presented. Dyed oil or grease is placed on the food contact side of the sample under a specific weight. The reverse side is then scanned after pre-selected time intervals. This method combines visual data with a numerical result obtained by image analyses. Likewise, there are several methods for testing mineral oil hydrocarbon (MOH) barrier of packaging materials. Such mineral oil residues in food have raised concern as potential genotoxic carcinogens during the recent years, especially in Europe. These contaminants may originate from printing ink residues from recycled paperboard, certain additives, processing aids, and lubricants. A test method for MOH barrier will be presented in which the mineral oils are introduced to the test system in the gas phase. The amount of MOH diffused through a packaging material and absorbed into a food simulant is determined by gas chromatography. Focus was on compounds of relevant molecular weight, and using equipment and materials which are commercially available.

Published
2016

2. Sustainable packaging materials with thin film deposition techniques

Author

Vähä-Nissi, Mika

Subjects
ALD, packaging material, thin film, atomic layer deposition, barrier, sustainable
Abstract

Trends towards sustainable light-weight packaging materials not interfering with the end-of-life or recycling schemes. Thin film deposition techniques presented as tools for applying functional layers at the nano-scale on different surfaces. Techniques, such as atomic layer deposition, provide possibilities to enhance the barrier properties of sensitive materials including papers, polymer films and coated papers and boards

Published
2011

3. Thin Al2O3 barrier coatings onto temperature-sensitive packaging materials by atomic layer deposition

Author

Hirvikorpi, Terhi, Vähä-Nissi, Mika, Nikkola, Juha, Harlin, Ali, and Karppinen, Maarit

Subjects
*METAL coating, *ALUMINUM oxide, *TEMPERATURE effect, *THIN films, *BIOPOLYMERS, *VAPOR barriers, *PACKAGING
Abstract

Abstract: Thin (25nm) and highly uniform Al2O3 coatings have been deposited at relatively low temperature of 80 and 100°C onto various bio-based polymeric materials employing the atomic layer deposition (ALD) technique. The work demonstrates that the ALD-grown Al2O3 coating significantly enhances the oxygen and water vapor barrier performance of these materials. Promising barrier properties were revealed for polylactide-coated board, hemicellulose-coated board as well as various biopolymer (polylactide, pectin and nano-fibrillated cellulose) films. [Copyright &y& Elsevier]

Published
2011
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4. Effect of corona pre-treatment on the performance of gas barrier layers applied by atomic layer deposition onto polymer-coated paperboard

Author

Hirvikorpi, Terhi, Vähä-Nissi, Mika, Harlin, Ali, Marles, Jaana, Miikkulainen, Ville, and Karppinen, Maarit

Subjects
*POLYMERS, *SURFACE coatings, *EPITAXY, *CORONA discharge, *SILICA, *ALUMINUM oxide, *POLYETHYLENE, *SURFACE energy
Abstract

Abstract: The effect of corona pre-treatment on the performance of Al2O3 and SiO2 gas barrier layers applied by atomic layer deposition onto polymer-coated paperboards was studied. Both polyethylene and polylactide coated paperboards were corona treated prior to ALD. Corona treatment increased surface energies of the paperboard substrates, and this effect was still observed after several days. Al2O3 and SiO2 films were grown on top of the polymer coatings at temperature of 100°C using the atomic layer deposition (ALD) technique. For SiO2 depositions a new precursor, bis(diethylamido) silane, was used. The positive effect of the corona pre-treatment on the barrier properties of the polymer-coated paperboards with the ALD-grown layers was more significant with polyethylene coated paperboard and with thin deposited layers (shorter ALD process). SiO2 performed similarly to Al2O3 with the PE coated board when it comes to the oxygen barrier, while the performance of SiO2 with the biopolymer-coated board was more moderate. The effect of corona pre-treatment was negligible or even negative with the biopolymer-coated board. The ALD film growth and the effect of corona treatment on different substrates require further investigation. [Copyright &y& Elsevier]

Published
2010
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5. Atomic layer deposited aluminum oxide barrier coatings for packaging materials

Author

Hirvikorpi, Terhi, Vähä-Nissi, Mika, Mustonen, Tuomas, Iiskola, Eero, and Karppinen, Maarit

Subjects
*ALUMINUM oxide, *PROTECTIVE coatings, *EPITAXY, *PACKAGING paper, *DIFFUSION, *BIOPOLYMERS
Abstract

Abstract: Thin aluminum oxide coatings have been deposited at a low temperature of 80°C on various uncoated papers, polymer-coated papers and boards and plain polymer films using the atomic layer deposition (ALD) technique. The work demonstrates that such ALD-grown Al2O3 coatings efficiently enhance the gas-diffusion barrier performance of the studied porous and non-porous materials towards oxygen, water vapor and aromas. [Copyright &y& Elsevier]

Published
2010
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