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Dive into the research topics where Johanna Lahti is active.

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Featured researches published by Johanna Lahti.


Journal of Adhesion Science and Technology | 2010

The Influence of Flame, Corona and Atmospheric Plasma Treatments on Surface Properties and Digital Print Quality of Extrusion Coated Paper

Mikko Tuominen; Johanna Lahti; Juho Lavonen; Tapani Penttinen; Jari Räsänen; Jurkka Kuusipalo

Polymer and paper structures have been successfully utilized in several fields, especially in the packaging industry. Together with barrier properties, printability is an important property in packaging applications. From the point of view of printing, the dense and impervious structure of extrusion coatings is challenging. Flame, corona and atmospheric plasma treatments were used to modify the surface of low density polyethylene (LDPE) and polypropylene (PP) and the influence of these surface modifications on print quality, i.e., toner adhesion and visual quality was studied. The traditional surface treatment methods, i.e., flame and corona treatments, increased the surface energy by introducing oxygen containing functional groups on the surfaces of LDPE and PP more than helium and argon plasma treatments. Only in the case of flame treatment, the higher surface energy and oxidation level led to better print quality, i.e., toner adhesion and visual quality, than the plasma treatments. The morphological changes observed on LDPE surface after flame treatment are partly responsible for the improved print quality. Atmospheric plasma treatments improved the print quality of LDPE and PP surfaces more than corona treatment. The electret phenomenon observed on LDPE and PP surfaces only after corona treatment is the most likely reason for the high print mottling and low visual quality of corona treated surface.


Applied Physics Letters | 2017

Achieving a slippery, liquid-infused porous surface with anti-icing properties by direct deposition of flame synthesized aerosol nanoparticles on a thermally fragile substrate

Paxton Juuti; Janne Haapanen; Christian Stenroos; Henna Niemelä-Anttonen; Juha Harra; Heli Koivuluoto; Hannu Teisala; Johanna Lahti; Mikko Tuominen; Jurkka Kuusipalo; Petri Vuoristo; Jyrki M. Mäkelä

Slippery, liquid-infused porous surfaces offer a promising route for producing omniphobic and anti-icing surfaces. Typically, these surfaces are made as a coating with expensive and time consuming assembly methods or with fluorinated films and oils. We report on a route for producing liquid-infused surfaces, which utilizes a liquid precursor fed oxygen-hydrogen flame to produce titania nanoparticles deposited directly on a low-density polyethylene film. This porous nanocoating, with thickness of several hundreds of nanometers, is then filled with silicone oil. The produced surfaces are shown to exhibit excellent anti-icing properties, with an ice adhesion strength of ∼12 kPa, which is an order of magnitude improvement when compared to the plain polyethylene film. The surface was also capable of maintaining this property even after cyclic icing testing.


Applied Surface Science | 2008

Effects of atmospheric plasma activation on surface properties of pigment-coated and surface-sized papers

Maiju Pykönen; Henna Sundqvist; Joakim Järnström; Otto-Ville Kaukoniemi; Mikko Tuominen; Johanna Lahti; Jouko Peltonen; Pedro Fardim; Martti Toivakka


Surface & Coatings Technology | 2008

Ageing effect in atmospheric plasma activation of paper substrates

Maiju Pykönen; Henna Sundqvist; Otto-Ville Kaukoniemi; Mikko Tuominen; Johanna Lahti; Pedro Fardim; Martti Toivakka


Appita Journal | 2001

New water-based barrier coatings for paper and paperboard

Mika Vähä-Nissi; Johanna Lahti; Antti Savolainen; Kati Rissa; Toivo Lepistö


Archive | 2005

Digital printing of polymer-coated paper or board

Jari Räsänen; Johanna Lahti; Antti Savolainen; Jurkka Kuusipalo


Journal of Coatings Technology and Research | 2014

Influence of substrate contamination, web handling, and pretreatments on the barrier performance of aluminum oxide atomic layer-deposited BOPP film

Kimmo Lahtinen; Johanna Lahti; Petri Johansson; Tarja Seppänen; David C. Cameron


Polymer Engineering and Science | 2004

The role of surface modification in digital printing on polymer-coated packaging boards

Johanna Lahti; Antti Savolainen; Jari Räsänen; Tanja Suominen; H. Huhtinen


Archive | 2002

Digital printing method and a paper or board applicable thereto

Johanna Lahti; Tapani Penttinen; Jari Räsänen; Jurkka Kuusipalo; Antti Savolainen


Progress in Organic Coatings | 2016

Machine-coated starch-based dispersion coatings prevent mineral oil migration from paperboard

Hanna M. Koivula; Laura Jalkanen; Esa Saukkonen; Sami-Seppo Ovaska; Johanna Lahti; Hanna Christophliemk; Kirsi S. Mikkonen

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Jurkka Kuusipalo

Tampere University of Technology

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Mikko Tuominen

Tampere University of Technology

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Antti Savolainen

Tampere University of Technology

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Hanna Christophliemk

Tampere University of Technology

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Christian Stenroos

Tampere University of Technology

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Hannu Teisala

Tampere University of Technology

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Heli Koivuluoto

Tampere University of Technology

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Henna Niemelä-Anttonen

Tampere University of Technology

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Henna Sundqvist

VTT Technical Research Centre of Finland

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