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  • 1.
    Malm, Veronica
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business. University of Borås.
    Tadesse Abate, Molla
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Supercritical Carbon Dioxide: A Sustainable Medium For Textile Dyeing And Finishing To Expand The Possibilities For A Resource Efficient Production Technology2019In: Autex 19th World Textile Conference: Textiles at the Crossroads, 2019, 2019Conference paper (Other academic)
    Abstract [en]

    In our research group focusing on resource efficient processes, we explore the waterless supercritical carbon dioxide (SC-CO2) technology as a promising sustainable alternative to the traditional textile wet dyeing and water based finishing processes. Already, it is industrially implemented for textile dyeing, in particular for synthetic fabrics, and, being a dry color process it is regarded as only using ¼ of the physical footprint compared to conventional dyeing. This, does not only account for water and energy savings, but also includes advantages such as reduced emissions of harmful effluents, less amount of used dye, no or minimal use of auxiliaries (dispersing agents, carriers and surfactants) and low waste of material. To expand the industrial capabilities of this technology and open up for new business opportunities, our research focuses on textile functionalization in SC-CO2, either by only applying a functional material or to combine dyeing and functionalization of fabric in a single-step process. For polyethylene terephthalate (PET) fabric dyeing (step 1) and functionalization (step 2) in a sequential process where similar processing parameters (high temperature and pressure) was used, it was found that the color was extracted in the second step. The PET dyeing kinetics using SC-CO2 as a solvent depend on the transition in the amorphous regions of the fiber and diffusion properties and solvating power of the SC-CO2 with the dye. Hence, extensive studies on compatibility between fiber, dye and functional compounds include solubility of dye and functional material in SC-CO2, optimization of process parameters (pressure and temperature) and depressurization. This is crucial for understanding the adhesion mechanism between fiber and chemicals, and, particularly for a proper adhesion with a durable functional performance. Furthermore, as SC-CO2 is a good solvent for hydrophobic compounds, nonionics and organic compounds with low molecules weight, there are challenges in modifying conventional compound or using co-solvents. Activities within this domain in our research group stretch between dyeing and functionalization of textiles with end-use properties such as antimicrobial, photochromic, moisture management, water repellency, soil repellency and flame retardant.

  • 2.
    Nierstrasz, Vincent
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Digital inkjet in functional and smart textile production: turning wet textile processes into dry and energy-efficient processes.2015In: Proceedings of the 54th Dornbirn Man-Made Fibre Congres, 16-18 September 2015, Dornbirn, Austria., 2015, p. 1-18Conference paper (Refereed)
    Abstract [en]

    Conventional textile dyeing and finishing processes typically utilize large quantities of water, energy and chemicals. Despite many efforts to improve resource efficiency textile industry still needs to find radical solutions to substantially reduce its ecological footprint. The objective of the research is to enable textile industry to introduce more effective processes avoiding unnecessary use of water, energy, chemicals and minimization of waste.Digital inkjet technology is a technology with large potential in resource effective production of high end products such as functional and smart textiles in addition to colour printing on textiles. Moreover, digital inkjet technology stimulates innovation through the possibility of small batches, enables novel production strategies (digitalisation of the value chain) and it effectively bridges design and technology. The technology offers strong potential in made-to-measure smart textiles with e.g. applications in health-care and sports.Our research projects in digital inkjet technology focus on the development of stable functional inks, in order to produce textiles with e.g. superhydrophobic, antistatic, conductive, UV sensing or antimicrobial properties as well as inks for color printing.

  • 3.
    Nierstrasz, Vincent
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Towards more flexible, sustainable and energy-efficient textile functionalization processes: Digital inkjet in functional and smart textile production2015Conference paper (Other academic)
    Abstract [en]

    Conventional textile processes are characterized by large scale production runs and typically utilize large quantities of water, energy and chemicals, making them less suitable for the production of functional and smart textiles. Key objective of the research initiative is to introduce flexible, more resource effective textile functionalization processes.

    Digital inkjet technology is a technology with large potential in resource effective production of high end products such as functional and smart textiles in addition to colour printing on textiles. The challenge is to make the potential of digital inkjet technology in high end products an opportunity for the European textile industry.

    Digital inkjet technology stimulates innovation through the possibility of small production runs, enables novel production strategies (digitalisation of the value chain) and it effectively bridges design and technology. The technology offers strong potential in made-to-measure smart textiles with e.g. applications in health-care and sports.

  • 4.
    Nierstrasz, Vincent
    et al.
    University of Borås, Swedish School of Textiles.
    Yu, Junchun
    University of Borås, Swedish School of Textiles.
    Seipel, Sina
    University of Borås, Swedish School of Textiles.
    Agnhage, Tove
    University of Borås, Swedish School of Textiles.
    Functionalization of textile materials using inkjet technology2014In: 53rd DORNBIRN MAN-MADE FIBERS CONGRESS, Dornbirn MFC , 2014, Vol. 60911PM1330, p. 1-8Conference paper (Other academic)
  • 5.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Resource-efficient production of a textile UV-sensor for healthcare applications2017In: Books of abstracts: Aachen-Dresden-Denkendorf International Textile Conference, Stuttgart, 2017, 2017Conference paper (Other academic)
  • 6.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Junchun, Yu
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Sustainable production of a UV-sensing smart textile2015Conference paper (Other academic)
    Abstract [en]

    The general objective of our research is to develop smart textiles using novel production techniques like digital inkjet printing. Digital inkjet printing enables a sustainable and integrated textile production where less energy, water and chemicals are used, as well as less waste is produced. Inkjet printing can typically be used for the production of small batches, which benefits the production of technical and smart high end products. The advantage compared to traditional textile production techniques is that functionalizing chemicals are applied only where needed and complex designs can easily be changed.

    Smart textiles are capable of interacting with the environment and are therewith ideal, flexible lightweight sensors [1]. A wearable and integrated sensor technology can among others be developed through the functionalization of textiles with chromic materials. By showing a reversible colour change a photochromic textile can make the user aware of an environmental danger such as augmented UV-radiation coupled with certain temperature conditions [2,3].

    Our research focus on the sustainable production of a UV-sensing smart textile leads to the exploration of minimized water and energy consumption in textile production. In specific, a radiation curable matrix as carrier for the functional material is investigated. The challenge in our work is to consider the role of radiation as curer and activator, as well as the effect of temperature in order to optimize the functionality range of the sensor. Furthermore, storage tests of photochromic prints are conducted to determine the storage stability of the UV-sensor. 

  • 7.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Viková, Martina
    Technical University of Liberec.
    Vik, Michal
    Technical University of Liberec.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Inkjet printing and UV-LED curing of photochromic dyes for functional and smart textile applications2018In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 8, no 50, p. 28395-28404Article in journal (Refereed)
    Abstract [en]

    Health concerns as a result of harmful UV-rays drive the development of UV-sensors of different kinds. In this research, a UV-responsive smart textile is produced by inkjet printing and UV-LED curing of a specifically designed photochromic ink on PET fabric. This paper focuses on tuning and characterizing the colour performance of a photochromic dye embedded in a UV-curable ink resin. The influence of industrial fabrication parameters on the crosslinking density of the UV-resin and hence on the colour kinetics is investigated. A lower crosslinking density of the UV-resin increases the kinetic switching speed of the photochromic dye molecules upon isomerization. By introducing an extended kinetic model, which defines rate constants kcolouration, kdecayand kdecolouration, the colour performance of photochromic textiles can be predicted. Fabrication parameters present a flexible and fast alternative to polymer conjugation to control kinetics of photochromic dyes in a resin. In particular, industrial fabrication parameters during printing and curing of the photochromic ink are used to set the colour yield, colouration/decolouration rates and the durability, which are important characteristics towards the development of a UV-sensor for smart textile applications.

  • 8.
    Seipel, Sina
    et al.
    University of Borås, Swedish School of Textiles.
    Yu, Junchun
    University of Borås, Swedish School of Textiles.
    Nierstrasz, Vincent
    University of Borås, Swedish School of Textiles.
    Development of a Textile UV-Sensor2014Conference paper (Other academic)
  • 9.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, JunchunUniversity of Borås, Faculty of Textiles, Engineering and Business.Nierstrasz, VincentUniversity of Borås, Faculty of Textiles, Engineering and Business.
    Digital inkjet printing as flexible and resource-saving production technique for a smart textile UV-sensor2016Conference proceedings (editor) (Other academic)
  • 10.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Digital inkjet printing as flexible and resource-saving production technique for a smart textile UV-sensor2016Conference paper (Other academic)
  • 11.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Production of a UV-curable and UV-sensing smart textile using digital inkjet printing2016In: Books of abstracts: Aachen-Dresden-Denkendorf International Textile Conference, Dresden, 2016Conference paper (Other academic)
  • 12.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Periyasamy, Aravin
    Technical University of Liberec.
    Viková, Martina
    Technical University of Liberec.
    Vik, Michal
    Technical University of Liberec.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Characterization and optimization of an inkjet-printed smart textile UV-sensor cured with UV-LED light2017In: IOP Conference Series: Materials Science and Engineering, 2017, Vol. 254, article id 072023Conference paper (Refereed)
    Abstract [en]

    For the development of niche products like smart textiles and other functional high-end products, resource-saving production processes are needed. Niche products only require small batches, which makes their production with traditional textile production techniques time-consuming and costly. To achieve a profitable production, as well as to further foster innovation, flexible and integrated production techniques are a requirement. Both digital inkjet printing and UV-light curing contribute to a flexible, resource-efficient, energy-saving and therewith economic production of smart textiles. In this article, a smart textile UV-sensor is printed using a piezoelectric drop-on-demand printhead and cured with a UV-LED lamp. The UVcurable ink system is based on free radical polymerization and the integrated UVsensing material is a photochromic dye, Reversacol Ruby Red. The combination of two photoactive compounds, for which UV-light is both the curer and the activator, challenges two processes: polymer crosslinking of the resin and color performance of the photochromic dye. Differential scanning calorimetry (DSC) is used to characterize the curing efficiency of the prints. Color measurements are made to determine the influence of degree of polymer crosslinking on the developed color intensities, as well as coloration and decoloration rates of the photochromic prints. Optimized functionality of the textile UV-sensor is found using different belt speeds and lamp intensities during the curing process.

  • 13.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Periyasamy, Aravin
    Technical University of Liberec.
    Viková, Martina
    Technical University of Liberec.
    Vik, Michal
    Technical University of Liberec.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Resource-Efficient Production of a Smart Textile UV Sensor Using Photochromic Dyes: Characterization and Optimization2018In: Narrow and Smart Textiles / [ed] Prof. Dr. Yordan Kyosev, Prof. Dr. Boris Mahltig, Prof. Dr. Anne Schwarz-Pfeiffer, Springer Publishing Company, 2018, p. 251-257Chapter in book (Refereed)
  • 14.
    Seipel, Sina
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Viková, Martina
    Technical University of Liberec.
    Vik, Michal
    Technical University of Liberec.
    Koldinská, Marie
    Technical University of Liberec.
    Havelka, Antonin
    Technical University of Liberec.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Color performance, durability and handle of inkjet-printed and UV-cured photochromic textiles for multi-colored applications2019In: Fibers And Polymers, ISSN 1229-9197, E-ISSN 1875-0052, Vol. 20Article in journal (Refereed)
    Abstract [en]

    The development and design of novel functional and smart textile materials such as textile sensors and multicolored systems based on photochromic dyes necessitate controls of color intensities, switching speeds, and material durability. Precise control and synchronization of dye kinetics are important for multi-colored photochromic applications especially. However, durability towards abrasion and washing should not be compromised on if we aim to design reliable future textile products. In this study, two different commercial photochromic dyes — a naphthopyran and a spirooxazine-based dye — have been applied on PET fabric by inkjet printing and UV-LED curing. The photochromic textiles’ color behavior, fastness to abrasion and washing, and handle are evaluated using spectrophotometry, scanning electron microscopy, and Kawabata evaluation system. Despite a decrease in color performance after washing, the photochromic inkjet print is effective and barely influences the textile structure. Reduced rigidity of the host matrix promoted higher color yields and faster dye kinetics, but also improved durability towards abrasion and washing. In order to synchronize kinetics of the different dye types for multi-colored applications, distinct curing conditions are preferable, which, however, result in varying print durability. In the design of multi-colored photochromic textiles, dye kinetics, and durability have to be balanced.

  • 15.
    Tadesse Abate, Molla
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Viková, M
    Department of Material Engineering; Faculty of Textile Engineering; Technical University of Liberec.
    Vik, M
    Department of Material Engineering; Faculty of Textile Engineering; Technical University of Liberec.
    Ferri, A
    3 Department of Applied Science and Technology, Politecnico di Torino.
    Jinping, G
    College of Textile and Clothing Engineering, Soochow University.
    Chen, G
    College of Textile and Clothing Engineering, Soochow University.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Comparison of the photochromic behaviour of dyes in solution and on polyester fabric applied by supercritical carbon dioxide2019Conference paper (Other academic)
    Abstract [en]

    Photochromic textiles are of considerable interest for smart and functional textile applications due to their remarkable dynamic colour changing effect when irradiated with light of a certain wavelength. The use of resource efficient processes, such as digital inkjet printing and supercritical carbon dioxide (scCO2) dyeing techniques enables an economic production of those high-end functional products with high material costs. In this study, photochromic polyester fabric has been prepared by applying two commercially important photochromic dyes from spirooxazine (SO) and naphthopyran (NP) dye classes using scCO2-dyeing technique. The properties of scCO2 dyed photochromic fabrics were compared with the properties of the same dyes in a non-polar solvent, hexane. UV-Vis spectroscopy and a specially designed online colour measurement system capable of simultaneous UV irradiation and colour measurement were used to evaluate the photochromic colour behaviour. Both photochromic dye types embedded in textile as well as in solution showed significant reversible colour changing properties when exposed to UV light and revert to their original non-coloured form when the UV light is removed. The scCO2 dyed polyester fabrics exhibited similar trends of colour build-up as in solution, while contrasting behaviour was observed in terms of colour changing rates compared to their behaviour in solution.

  • 16.
    Yu, Junchun
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Digital inkjet functionalization of water-repellent textile for smart textile application2018In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803Article in journal (Refereed)
    Abstract [en]

    Digital inkjet printing is a production technology with high potential in resource efficient processes, which features both flexibility and productivity. In this research, waterborne, fluorocarbon-free ink containing polysiloxane in the form of micro-emulsion is formulated for the application of water-repellent sports- and work wear. The physicochemical properties of the ink such as surface tension, rheological properties and particle size are characterized, and thereafter inkjet printed as solid square pattern (10 × 10 cm) on polyester and polyamide 66 fabrics. The water contact angle (WCA) of the functional surfaces is increased from < 90° to ca. 140° after 10 inkjet printing passes. Moreover, the functional surface shows resistance to wash and abrasion. The WCA of functional surfaces is between 130° and 140° after 10 wash cycles, and is ca. 140° after 20000 revolutions of rubbing. The differences in construction of the textile as well as ink–filament interaction attribute to the different transportation behaviors of the ink on the textile, reflected in the durability of the functional layer on the textile. The functionalized textile preserves its key textile feature such as softness and breathability. Inkjet printing shows large potential in high-end applications such as customized functionalization of textiles in the domain of smart textiles.

  • 17.
    Yu, Junchun
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business. vincent.nierstrasz@hb.se.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Inkjet printing of waterborne hydrophobic ink for functionalization of textile2015Conference paper (Other academic)
    Abstract [en]

    Digital inkjet printing of functional layer on textiles is a resource efficient and flexible manufacturing process, with reduced ecological footprint. This technology has large potential in high-end applications such as in the domain of smart textiles. The purpose of our research is to develop a waterborne, fluorocarbon free ink for water-repellent sports- and work- wear. The novel ink formulation was characterized by measuring surface tension and rheology and thereafter inkjet printed as solid block pattern (10×10 cm) on polyester fabrics. The hydrophobicity of the functional surface was characterized by water contact angle measurements. The wash fastness and abrasion properties of functional surface were investigated. The inkjet printed functional surface shows promising hydrophobicity compared to commercial available products.

  • 18.
    Yu, Junchun
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    DEVELOPMENT OF HYDROPHOBIC INK FOR INKJET PRINTING OF FUNCTIONAL TEXTILE2016Conference paper (Other academic)
    Abstract [en]

    Digital inkjet printing is a resource effective and flexible manufacturing method, which has great potential to replace the large-scale conventional textile processes, and stimulates innovation in small and flexible production such as in the domain of smart textiles. Water-repellent textile has great importance in the application of sport- and work- wear. In this research, a hydrophobic ink free from fluorocarbon is formulated. The rheological properties, surface tension and particle size were characterized in order to fit the jetting parameter of the print head. In order to improve the adhesion between the deposited ink and substrate, plasma and alkaline pre-treatment were performed on polyester substrate. The novel formulation was inkjet printed as the solid bock on polyester and polyamide 6,6. The hydrophobicity of the fabrics was measured by water contract angle measurement. The effect of pre-treatment on the adhesion of ink to substrate as well as on functional property of textile was evaluated after washing and abrasion tests.   

  • 19.
    Yu, Junchun
    et al.
    University of Borås, Faculty of Textiles, Engineering and Business.
    Seipel, Sina
    University of Borås, Faculty of Textiles, Engineering and Business.
    Nierstrasz, Vincent
    University of Borås, Faculty of Textiles, Engineering and Business.
    Inkjet printing of functional ink for smart textile application2016Conference paper (Other academic)
    Abstract [en]

    Fluorocarbon-free, water-repellent inks for sports- and work- wear were developed and inkjet printed. The inkjet printed samples show promising hydrophobicity and fastness properties. The result indicates that it can be possible to combine inkjet printing and functional ink as resource efficient production method for customization in the domain of smart textile.

1 - 19 of 19
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