Jurkka Kuusipalo | Tampere University (original) (raw)
Papers by Jurkka Kuusipalo
Packaging Technology and Science, Feb 18, 2022
Due to the ability of oils to penetrate into the structure of polymers, it is possible to create ... more Due to the ability of oils to penetrate into the structure of polymers, it is possible to create slippery surfaces with low water droplet sliding angles based on polymer coatings. Polylactic acid, polybutylene succinate and low‐density polyethylene extrusion coatings were used as such surfaces in this study. The process of penetration of vegetable oils into the polymers was studied with the subsequent investigation of slippery behaviour of such system. Cottonseed oil and castor oil showed promising properties as lubricants. For oil infused polymer surfaces the water droplet sliding angles were significantly lower than for the untreated extrusion coating. The penetration of the permeant into the upper layers of the coating was confirmed by alteration of the static water contact angle, sliding angle and also by the cross section images. LDPE extrusion coating infused with castor oil showed the lowest water sliding angle − 8°. Biopolymers, being a main focus in this study, exhibited also promising results, PLA reached sliding angle of 14° with both olive and castor oil. Dependence of polymer permeability on various factors is rather complex and the wide range of oils used in this work helps to interpret the barrier performance of the studied materials. Degree of bond saturation, viscosity and polarity were found to influence mostly on the oil permeation through the studied polymers.
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Journal of Applied Polymer Science, Apr 17, 2023
Increasing environmental and legislative demands have accelerated the development of new packagin... more Increasing environmental and legislative demands have accelerated the development of new packaging materials and processes toward more sustainable alternatives. Furthermore, barrier properties of the packaging have become increasingly important, as food waste creates environmental problems. Nowadays, multilayer structures are typically used to create required barrier properties to the packages. The aim of the study was to combine dispersion and extrusion coating into consecutive tandem process to produce two‐layer structure with enhanced barrier properties. By combining two processing steps into one, time and resources are saved. The study presents demonstration of the tandem coating in pilot‐scale. The process was tested with several different materials and combinations and the processing conditions were optimized to produce optimal layer structure and properties. The properties of samples were analyzed with microscopy imaging, pinhole measurement and barrier measurements including oxygen, water vapor and grease permeation. Single layer of dispersion coatings could not produce continuous film, but the extrusion coatings filled the pinholes and enabled low permeation values. The permeabilities of the tandem coated structures were promising and generally lower than the sum of two individual layers. Moreover, the tandem coated structures produced with sustainable alternatives, performed better than traditional materials in oxygen and grease permeation measurements.
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John Wiley & Sons, Inc. eBooks, May 28, 2013
ABSTRACT Polymer and paper structures have been successfully utilized in several fields, especial... more ABSTRACT Polymer and paper structures have been successfully utilized in several fields, especially in the packaging industry. Besides barrier properties, printability and sealability are the most important properties of fiberbased packaging materials. This second part of our study shows how atmospheric plasma and corona treatments modify surface properties of low density polyethylene (LDPE) and polypropylene (PP) coatings and what is the effect of these surface modifications on the printability, sealability, friction, gloss and barrier (moisture and grease) properties of these extrusion coatings. Plasma and corona treatments increased the surface energy mainly by introducing oxygen containing functional groups onto the surfaces of LDPE and PP coatings. Helium and argon plasma treatments improved the print quality of extrusion coatings more than corona treatment. The electret phenomenon was observed on LDPE and PP surfaces after corona treatment and it is the most likely reason for the high print mottling and low visual quality of corona treated surfaces. Plasma and corona treatments affected the sealability properties of LDPE and PP coatings by decreasing the heat sealing temperature and hot tack strength of the extrusion coatings. The reason for the altered sealability properties of LDPE and PP coatings is probably related to the changes in the surface molecular weight of the extrusion coatings. Low-molecular-weightoxidized- compounds (LMWOCs) observed on the surface of plasma and corona treated LDPE coating are the most likely explanation for the increased hot tack strength of the LDPE coating at the high treatment level. In addition, plasma and corona treatments increased the friction of LDPE and PP surfaces, whereas no significant changes were observed in surface gloss or barrier property of the extrusion coatings. © 2013 Scrivener Publishing LLC. All rights reserved.
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Nordic Pulp & Paper Research Journal, Dec 1, 2014
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MRS Proceedings, 2015
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ACS Applied Materials & Interfaces, Mar 4, 2019
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International Conference on Nanotechnology, 2010
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• Liquid flame spray technology enables low-cost, large-scale nanoparticle deposition in roll-to-... more • Liquid flame spray technology enables low-cost, large-scale nanoparticle deposition in roll-to-roll processes for controlling wettability and creating functional surfaces • SiO2 nanocoating has higher abrasion resistance than TiO2 coating, possibly due to better interparticle sintering • Wettability properties of the LFS nanoparticle coated paperboard are partially maintained after abrasion with a paper surface or compression through calendering • The changes in wettability are due to smoothening of the nanoparticle surface Changes in wettability properties during transport and in converting operations can be expected to be small • Challenges: - Nanoparticle release to air and safety aspects are unknown and difficult to quantify • Potential applications: - Printability control - Improved barrier and heat-sealing properties for extrusion coated board - Adhesion promotion in converting - Liquid absorption control in papermaking and converting operations - Functional surfaces, e.g., self-cleaning surfaces - Printed electronics applications - Microfluidics.
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Thin Solid Films, 2014
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Journal of Vacuum Science & Technology B, 2014
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Research Square (Research Square), Feb 16, 2023
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ACS Applied Polymer Materials
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Barrier Coating Symposium, 2004
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Packaging Technology and Science, 2017
The purpose of the present work was to improve melt rheological properties of linear poly(L‐lacti... more The purpose of the present work was to improve melt rheological properties of linear poly(L‐lactide) (PLLA) by melt blending with peroxide‐modified branched PLLA for extrusion coating. Peroxide‐modified PLLA, ie, PLLA melt extruded with 0.3 wt% of tert‐Butyl‐peroxybenzoate (TBPB); 2,5‐dimethyl‐2,5‐(tert‐butylperoxy)‐hexane (Lupersol 101 [LOL1]); and benzoyl peroxide was added to linear PLLA in ratios of 5, 15, and 30 wt%. All blends showed increased zero shear viscosity, elastic feature (storage modulus, decreased tan delta), and shear sensitivity. The blends' properties were mostly dependent on the peroxide applied for the modification and, to some extent, on the amount of added peroxide‐modified PLLA. Rheological models suggest that all blend compositions are mainly immiscible. Thermal properties were unchanged; all materials remained amorphous, though the enthalpy of cold crystallization was slightly increased. Extrusion coating on paperboard was conducted with PLLA and perox...
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La presente invention concerne du carton enduit ou du carton (1) compostable a base de polymere, ... more La presente invention concerne du carton enduit ou du carton (1) compostable a base de polymere, un procede de fabrication de ces derniers ainsi que des produits obtenus a partir de ces derniers. Selon l'invention, un revetement (3) biodegradable compostable destine a du papier ou du carton (1) est constitue d'une couche externe (6) contenant du polylactide don't le poids maximum est de l'ordre d'environ 20 g/m2, et d'une couche adhesive (7) qui lie la couche externe au papier ou au carton (1) et qui est formee d'une matiere polymere biodegradable coextrudee avec le polylactide. Les matieres appropriees pour la couche adhesive (7) sont les polyesters biodegradables. La fabrication s'effectue au moyen de la coextrusion de la couche (6) de polylactide et de la couche adhesive (7) sur l'un ou l'autre des cotes du papier ou du carton ou bien sur les deux cotes de ce dernier. Les produits obtenus de la sorte comprennent plus particulierement des co...
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Tappi Journal, 1990
On examine le fonctionnement d'une installation de traitement par decharge en couronne et on ... more On examine le fonctionnement d'une installation de traitement par decharge en couronne et on etudie ses effets sur l'aptitude au collage, a l'impression et au scellage a chaud de papiers couches a l'aide de polyethylene basse densite.
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Tappi Journal, 1996
This study analyzes the combination of different tie layers with normal coextrusion and coating p... more This study analyzes the combination of different tie layers with normal coextrusion and coating parameters : temperature, speed, and pretreatments. We wanted to determine the best combination possible and to issue recommendations for extrusion and coating. The typical structure was paper/tie layer/barrier layer/tie layer/LDPE (low-density polyethylene). When LDPE is coated on paper, pretreatments of the web are used (such as corona or flame). Sometimes ozone is sent onto the melt to increase natural oxidation. The same thinking could be applied to tie layers, but the trials showed that certain combinations lead to different conclusions. The effect of parameters such as corona or flame power, which were thought to depend only on the paper type, could also be influenced by the combination paper-tie layer. This could mean that web pretreatments are not always needed. Application : the results given in this article will help the reader devise the best conditions for extrusion coating mu...
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Packaging Technology and Science, Feb 18, 2022
Due to the ability of oils to penetrate into the structure of polymers, it is possible to create ... more Due to the ability of oils to penetrate into the structure of polymers, it is possible to create slippery surfaces with low water droplet sliding angles based on polymer coatings. Polylactic acid, polybutylene succinate and low‐density polyethylene extrusion coatings were used as such surfaces in this study. The process of penetration of vegetable oils into the polymers was studied with the subsequent investigation of slippery behaviour of such system. Cottonseed oil and castor oil showed promising properties as lubricants. For oil infused polymer surfaces the water droplet sliding angles were significantly lower than for the untreated extrusion coating. The penetration of the permeant into the upper layers of the coating was confirmed by alteration of the static water contact angle, sliding angle and also by the cross section images. LDPE extrusion coating infused with castor oil showed the lowest water sliding angle − 8°. Biopolymers, being a main focus in this study, exhibited also promising results, PLA reached sliding angle of 14° with both olive and castor oil. Dependence of polymer permeability on various factors is rather complex and the wide range of oils used in this work helps to interpret the barrier performance of the studied materials. Degree of bond saturation, viscosity and polarity were found to influence mostly on the oil permeation through the studied polymers.
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Journal of Applied Polymer Science, Apr 17, 2023
Increasing environmental and legislative demands have accelerated the development of new packagin... more Increasing environmental and legislative demands have accelerated the development of new packaging materials and processes toward more sustainable alternatives. Furthermore, barrier properties of the packaging have become increasingly important, as food waste creates environmental problems. Nowadays, multilayer structures are typically used to create required barrier properties to the packages. The aim of the study was to combine dispersion and extrusion coating into consecutive tandem process to produce two‐layer structure with enhanced barrier properties. By combining two processing steps into one, time and resources are saved. The study presents demonstration of the tandem coating in pilot‐scale. The process was tested with several different materials and combinations and the processing conditions were optimized to produce optimal layer structure and properties. The properties of samples were analyzed with microscopy imaging, pinhole measurement and barrier measurements including oxygen, water vapor and grease permeation. Single layer of dispersion coatings could not produce continuous film, but the extrusion coatings filled the pinholes and enabled low permeation values. The permeabilities of the tandem coated structures were promising and generally lower than the sum of two individual layers. Moreover, the tandem coated structures produced with sustainable alternatives, performed better than traditional materials in oxygen and grease permeation measurements.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
John Wiley & Sons, Inc. eBooks, May 28, 2013
ABSTRACT Polymer and paper structures have been successfully utilized in several fields, especial... more ABSTRACT Polymer and paper structures have been successfully utilized in several fields, especially in the packaging industry. Besides barrier properties, printability and sealability are the most important properties of fiberbased packaging materials. This second part of our study shows how atmospheric plasma and corona treatments modify surface properties of low density polyethylene (LDPE) and polypropylene (PP) coatings and what is the effect of these surface modifications on the printability, sealability, friction, gloss and barrier (moisture and grease) properties of these extrusion coatings. Plasma and corona treatments increased the surface energy mainly by introducing oxygen containing functional groups onto the surfaces of LDPE and PP coatings. Helium and argon plasma treatments improved the print quality of extrusion coatings more than corona treatment. The electret phenomenon was observed on LDPE and PP surfaces after corona treatment and it is the most likely reason for the high print mottling and low visual quality of corona treated surfaces. Plasma and corona treatments affected the sealability properties of LDPE and PP coatings by decreasing the heat sealing temperature and hot tack strength of the extrusion coatings. The reason for the altered sealability properties of LDPE and PP coatings is probably related to the changes in the surface molecular weight of the extrusion coatings. Low-molecular-weightoxidized- compounds (LMWOCs) observed on the surface of plasma and corona treated LDPE coating are the most likely explanation for the increased hot tack strength of the LDPE coating at the high treatment level. In addition, plasma and corona treatments increased the friction of LDPE and PP surfaces, whereas no significant changes were observed in surface gloss or barrier property of the extrusion coatings. © 2013 Scrivener Publishing LLC. All rights reserved.
Bookmarks Related papers MentionsView impact
Nordic Pulp & Paper Research Journal, Dec 1, 2014
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MRS Proceedings, 2015
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ACS Applied Materials & Interfaces, Mar 4, 2019
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International Conference on Nanotechnology, 2010
Bookmarks Related papers MentionsView impact
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• Liquid flame spray technology enables low-cost, large-scale nanoparticle deposition in roll-to-... more • Liquid flame spray technology enables low-cost, large-scale nanoparticle deposition in roll-to-roll processes for controlling wettability and creating functional surfaces • SiO2 nanocoating has higher abrasion resistance than TiO2 coating, possibly due to better interparticle sintering • Wettability properties of the LFS nanoparticle coated paperboard are partially maintained after abrasion with a paper surface or compression through calendering • The changes in wettability are due to smoothening of the nanoparticle surface Changes in wettability properties during transport and in converting operations can be expected to be small • Challenges: - Nanoparticle release to air and safety aspects are unknown and difficult to quantify • Potential applications: - Printability control - Improved barrier and heat-sealing properties for extrusion coated board - Adhesion promotion in converting - Liquid absorption control in papermaking and converting operations - Functional surfaces, e.g., self-cleaning surfaces - Printed electronics applications - Microfluidics.
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Thin Solid Films, 2014
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Journal of Vacuum Science & Technology B, 2014
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Research Square (Research Square), Feb 16, 2023
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ACS Applied Polymer Materials
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Barrier Coating Symposium, 2004
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Packaging Technology and Science, 2017
The purpose of the present work was to improve melt rheological properties of linear poly(L‐lacti... more The purpose of the present work was to improve melt rheological properties of linear poly(L‐lactide) (PLLA) by melt blending with peroxide‐modified branched PLLA for extrusion coating. Peroxide‐modified PLLA, ie, PLLA melt extruded with 0.3 wt% of tert‐Butyl‐peroxybenzoate (TBPB); 2,5‐dimethyl‐2,5‐(tert‐butylperoxy)‐hexane (Lupersol 101 [LOL1]); and benzoyl peroxide was added to linear PLLA in ratios of 5, 15, and 30 wt%. All blends showed increased zero shear viscosity, elastic feature (storage modulus, decreased tan delta), and shear sensitivity. The blends' properties were mostly dependent on the peroxide applied for the modification and, to some extent, on the amount of added peroxide‐modified PLLA. Rheological models suggest that all blend compositions are mainly immiscible. Thermal properties were unchanged; all materials remained amorphous, though the enthalpy of cold crystallization was slightly increased. Extrusion coating on paperboard was conducted with PLLA and perox...
Bookmarks Related papers MentionsView impact
La presente invention concerne du carton enduit ou du carton (1) compostable a base de polymere, ... more La presente invention concerne du carton enduit ou du carton (1) compostable a base de polymere, un procede de fabrication de ces derniers ainsi que des produits obtenus a partir de ces derniers. Selon l'invention, un revetement (3) biodegradable compostable destine a du papier ou du carton (1) est constitue d'une couche externe (6) contenant du polylactide don't le poids maximum est de l'ordre d'environ 20 g/m2, et d'une couche adhesive (7) qui lie la couche externe au papier ou au carton (1) et qui est formee d'une matiere polymere biodegradable coextrudee avec le polylactide. Les matieres appropriees pour la couche adhesive (7) sont les polyesters biodegradables. La fabrication s'effectue au moyen de la coextrusion de la couche (6) de polylactide et de la couche adhesive (7) sur l'un ou l'autre des cotes du papier ou du carton ou bien sur les deux cotes de ce dernier. Les produits obtenus de la sorte comprennent plus particulierement des co...
Bookmarks Related papers MentionsView impact
Tappi Journal, 1990
On examine le fonctionnement d'une installation de traitement par decharge en couronne et on ... more On examine le fonctionnement d'une installation de traitement par decharge en couronne et on etudie ses effets sur l'aptitude au collage, a l'impression et au scellage a chaud de papiers couches a l'aide de polyethylene basse densite.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Tappi Journal, 1996
This study analyzes the combination of different tie layers with normal coextrusion and coating p... more This study analyzes the combination of different tie layers with normal coextrusion and coating parameters : temperature, speed, and pretreatments. We wanted to determine the best combination possible and to issue recommendations for extrusion and coating. The typical structure was paper/tie layer/barrier layer/tie layer/LDPE (low-density polyethylene). When LDPE is coated on paper, pretreatments of the web are used (such as corona or flame). Sometimes ozone is sent onto the melt to increase natural oxidation. The same thinking could be applied to tie layers, but the trials showed that certain combinations lead to different conclusions. The effect of parameters such as corona or flame power, which were thought to depend only on the paper type, could also be influenced by the combination paper-tie layer. This could mean that web pretreatments are not always needed. Application : the results given in this article will help the reader devise the best conditions for extrusion coating mu...
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