Ulrich Hirn

Univ.-Prof. Dipl.-Ing. Dr.techn.

1990 …2022
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Research Output 1999 2019

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2019

A continuum micromechanics approach to the elasticity and strength of planar fiber networks: Theory and application to paper sheets

Godinho, P. M. J. S., Jajcinovic, M., Wagner, L., Vass, V., Fischer, W. J., Bader, T. K., Hirn, U., Bauer, W., Eberhardsteiner, J. & Hellmich, C., 1 May 2019, In : European Journal of Mechanics, A/Solids. 75, p. 516-531 16 p.

Research output: Contribution to journalArticleResearchpeer-review

micromechanics
Micromechanics
Circuit theory
Elasticity
elastic properties

A minimal continuum representation of a transverse isotropic viscoelastic pulp fibre based on micromechanical measurements

Seidlhofer, T., Czibula, C. M., Teichert, C., Payerl, C., Hirn, U. & Ulz, M. H., 2019, In : Mechanics of Materials. 135, p. 149-161 13 p.

Research output: Contribution to journalArticleResearchpeer-review

Pulp
continuums
fibers
Fibers
complex compounds

Effect of mechanically induced micro deformations on extensibility and strength of individual softwood pulp fibers and sheets

Kouko, J., Jajcinovic, M., Fischer, W. J., Ketola, A., Hirn, U. & Retulainen, E., 2019, In : Cellulose. 26, 3, p. 1995-2012

Research output: Contribution to journalArticleResearchpeer-review

Open Access

Evaluating the degree of molecular contact between cellulose fiber surfaces using FRET microscopy

Urstöger, G., Simoes, M. G., Steinegger, A., Schennach, R. & Hirn, U., 1 Jan 2019, In : Cellulose. 26, 12, p. 7037-7050

Research output: Contribution to journalArticleResearchpeer-review

Cellulose
Energy transfer
Microscopic examination
Fibers
Pulp

Material model of pulp fibres

Seidlhofer, T., Hirn, U. & Ulz, M. H., 2019, In : Proceedings in Applied Mathematics and Mechanics . 2 p.

Research output: Contribution to journalArticleResearchpeer-review

Open Access
Pulp
Fibers
Constitutive equations
Plastics
Industry

Multilayer Density Analysis of Cellulose Thin Films

Sampl, C., Niegelhell, K., Reishofer, D., Resel, R., Spirk, S. & Hirn, U., 16 Apr 2019, In : Frontiers in Chemistry. 7, p. 251 251.

Research output: Contribution to journalArticleResearchpeer-review

Cellulose films
Multilayers
Thin films
Cellulose
Atomic force microscopy

Time-dependent mechanical response of paper during web fed high speed inkjet printing

Lahti, J. A., Hirn, U. & Kouko, J., 2019, In : Nordic pulp & paper research journal. 34, 1, p. 107-116

Research output: Contribution to journalArticleResearchpeer-review

Transverse viscoelastic properties of pulp fibers investigated with an atomic force microscopy method

Czibula, C. M., Ganser, C., Seidlhofer, T., Teichert, C. & Hirn, U., 2019, In : Journal of Materials Science. 54, 17, p. 11448–11461

Research output: Contribution to journalArticleResearchpeer-review

Open Access
Pulp
Atomic force microscopy
Atmospheric humidity
Fibers
Water
2018
Open Access
Chitosan
Surface treatment
Drying
Biopolymers
Coatings

Combining adhesive contact mechanics with a viscoelastic material model to probe local material properties by AFM

Ganser, C., Czibula, C. M., Tscharnuter, D., Schöberl, T., Teichert, C. & Hirn, U., 2018, In : Soft matter. 14, p. 140-150

Research output: Contribution to journalArticleResearchpeer-review

Influence of relative humidity on the strength of hardwood and softwood pulp fibres and fibre to fibre joints

Jajcinovic, M., Fischer, W. J., Andreas, M., Bauer, W. & Hirn, U., 2018, In : Cellulose. 25, 4, p. 2681-2690

Research output: Contribution to journalArticleResearchpeer-review

Interaction of industrially relevant cationic starches with cellulose

Niegelhell, K., Chemelli, A., Hobisch, J., Griesser, T., Reiter, H., Hirn, U. & Spirk, S., 2018, In : Carbohydrate Polymers. 179, p. 290-296 7 p.

Research output: Contribution to journalArticleResearchpeer-review

Short timescale wetting and penetration on porous sheets measured with ultrasound, direct absorption and contact angle

Krainer, S. & Hirn, U., 2018, In : RSC Advances . 8, 23, p. 12861–12869 8 p.

Research output: Contribution to journalArticleResearchpeer-review

Contact angle
Wetting
Ultrasonics
Liquids
Scanning
2016

A new test device to analyse the flow resistance and compressive behaviour of fibre mats

Flitsch, J., Bauer, W. & Hirn, U., 2016, In : Nordic pulp & paper research journal. 31, 4, p. 634 640 p., DOI:10.3183/NPPRJ-2016-31-04-p634-640.

Research output: Contribution to journalArticleResearchpeer-review

A Proposed Failure Mechanism for Pulp Fiber-Fiber Joints

Ebner, T., Hirn, U., Fischer, W. J., Schmied, F. J., Schennach, R. & Ulz, M. H., 2016, In : BioResources . 11, 4, p. 9596-9610 15 p.

Research output: Contribution to journalArticleResearchpeer-review

File

Heat of sorption: A comparison between isotherm models and calorimeter measurements of wood pulp

Leuk, P., Schneeberger, M., Hirn, U. & Bauer, W., 2016, In : Drying technology. 34, 5, p. 563-573

Research output: Contribution to journalArticleResearchpeer-review

Strength of individual hardwood fibres and fibre to fibre joints

Jajcinovic, M., Fischer, W. J., Hirn, U. & Bauer, W., 2016, In : Cellulose. 23, 3, p. 2049-2060 12 p.

Research output: Contribution to journalArticleResearchpeer-review

2015

A comparison of five optical surface topography measurement methods

Mettänen, M. & Hirn, U., 2015, In : TAPPI journal. 14, 1, p. 27-37

Research output: Contribution to journalArticleResearchpeer-review

Comprehensive analysis of individual pulp fiber bonds quantifies the mechanisms of fiber bonding in paper

Hirn, U. & Schennach, R., 2015, In : Scientific reports. 5, p. 10503- 1-9

Research output: Contribution to journalArticleResearchpeer-review

Fast Evaluation of Spatial Coating Layer Formation using Ultraviolet Scanner Imaging

Fuchs, W., Dauer, M., Hirn, U., Bauer, W. & Keller, D. S., 2015, In : TAPPI journal. 14, 8, p. 527-535

Research output: Contribution to journalArticleResearchpeer-review

2014

AFM nanoindentation of pulp fibers and thin cellulose films at varying relative humidity

Ganser, C., Hirn, U., Rohm, S., Schennach, R. & Teichert, C., 2014, In : Holzforschung. 68, 1, p. 53-60

Research output: Contribution to journalArticleResearchpeer-review

A simulation model to optimize the energy consumption in paper drying

Schneeberger, M., Leuk, P., Hirn, U., Bauer, W. & Fisera, P., 2014, In : IPW. 4-5, p. 45-47

Research output: Contribution to journalArticleResearch

Imaging of the formerly bonded area of individual fibre to fibre joints with SEM and AFM

Fischer, W. J., Zankel, A., Ganser, C., Schmied, F., Schröttner, H., Hirn, U., Teichert, C., Bauer, W. & Schennach, R., 2014, In : Cellulose. 21, 1, p. 251-260

Research output: Contribution to journalArticleResearchpeer-review

Paper drying: A simulation model to optimize the energy consumption

Schneeberger, M., Leuk, P., Hirn, U., Bauer, W. & Fisera, P., 2014, In : IPW. 4-5, p. 45-47 3 p.

Research output: Contribution to journalArticleResearchpeer-review

Drying
Energy utilization
Thermal energy
Pulp
Fibers

Pulp Fiber Bending Stiffness in Wet and Dry State Measured from Moment of Inertia and Modulus of Elasticity

Lorbach, C., Fischer, W. J., Gregorova, A., Hirn, U. & Bauer, W., 2014, In : BioResources . 9, 3, p. 5511-5528

Research output: Contribution to journalArticleResearchpeer-review

Thin cellulose films as a model system for paper fibre bonds

Rohm, S., Hirn, U., Ganser, C., Teichert, C. & Schennach, R., 2014, In : Cellulose. 21, 1, p. 237-249

Research output: Contribution to journalArticleResearchpeer-review

2013

Adhesion of cellulose fibers in paper

Persson, B. NJ., Ganser, C., Schmied, F., Teichert, C., Schennach, R., Gilli, E. & Hirn, U., 2013, In : Journal of physics / Condensed matter. 25, p. 045002-11 pages

Research output: Contribution to journalArticleResearchpeer-review

Modelling over- and underdispersed frequencies of successful ink transmissions onto paper

Feirer, V., Friedl, H. & Hirn, U., 2013, In : Journal of applied statistics. 40, 3, p. 626-643

Research output: Contribution to journalArticleResearchpeer-review

Opportunities for Energy Savings in the Drying Section

Schneeberger, M., Leuk, P., Hirn, U., Fisera, P. & Bauer, W., 2013, In : Papir. 41, 9, p. 30-33

Research output: Contribution to journalArticleResearch

What holds paper together: Nanometre scale exploration of bonding between paper fibres

Schmied, F., Teichert, C., Kappel, L., Hirn, U., Bauer, W. & Schennach, R., 2013, In : Scientific reports. 3, p. 2432-1-6

Research output: Contribution to journalArticleResearchpeer-review

2012

Analysis of precipitated lignin on kraft pulp fibers using atomic force microscopy

Schmied, F., Teichert, C., Kappel, L., Hirn, U. & Schennach, R., 2012, In : Cellulose. 19, p. 1013-1021

Research output: Contribution to journalArticleResearchpeer-review

Automated 3D Measurement of Fiber Cross Section Morphology in Handsheets

Lorbach, C., Hirn, U., Kritzinger, J. & Bauer, W., 2012, In : Nordic pulp & paper research journal. 27, 2, p. 264-269

Research output: Contribution to journalArticleResearchpeer-review

Joint strength measurements of individual fiber-fiber bonds – an atomic force microscopy based method

Schmied, F., Teichert, C., Kappel, L., Hirn, U. & Schennach, R., 2012, In : Review of scientific instruments. 83, p. 073902-1-073902-8

Research output: Contribution to journalArticleResearchpeer-review

Testing of individual fiber-fiber joints under biaxial load and simultaneous analysis of deformation

Fischer, W. J., Hirn, U., Bauer, W. & Schennach, R., 2012, In : Nordic pulp & paper research journal. 27, 2, p. 237-244

Research output: Contribution to journalArticleResearchpeer-review

2010

Calendering effects on coating pore structure and ink setting behavior

Resch, P., Bauer, W. & Hirn, U., 2010, In : TAPPI journal. 9, 1, p. 27-35

Research output: Contribution to journalArticleResearchpeer-review

Revisiting polarized light microscopy for fiber-fiber bond area measurement - Part I: Theoretical fundamentals

Kappel, L., Hirn, U., Gilli, E., Bauer, W. & Schennach, R., 2010, In : Nordic pulp & paper research journal. 25, 1, p. 65-70

Research output: Contribution to journalArticleResearchpeer-review

Revisiting polarized light microscopy for fiber-fiber bond area measurement - Part II: Proving the applicability

Kappel, L., Hirn, U., Gilli, E., Bauer, W. & Schennach, R., 2010, In : Nordic pulp & paper research journal. 25, 1, p. 71-75

Research output: Contribution to journalArticleResearchpeer-review

2009

Analysis of CMC attachment onto cellulosic fibers by infrared spectroscopy

Gilli, E., Horvath, E., Horvath, A., Hirn, U. & Schennach, R., 2009, In : Cellulose. 16, 5, p. 825-832

Research output: Contribution to journalArticleResearchpeer-review

An optical model for polarization microscopy analysis of pulp fibre-to-fibre bonds

Gilli, E., Kappel, L., Hirn, U. & Schennach, R., 2009, In : Composite interfaces. 16, 5, p. 901-922

Research output: Contribution to journalArticleResearchpeer-review

A novel method for the determination of bonded area of individual fiber-fiber bonds

Kappel, L., Hirn, U., Bauer, W. & Schennach, R., 2009, In : Nordic pulp & paper research journal. 24, 2, p. 199-205

Research output: Contribution to journalArticleResearchpeer-review

Hochauflösende Beta Formationsmessung

Hirn, U., 2009, In : Papier aus Österreich. 7-8/09, p. 26-27

Research output: Contribution to journalArticleResearch

Subjektive Wahrnehmung

Hirn, U., 2009, In : Papier aus Österreich. 11, p. 24-24

Research output: Contribution to journalArticleResearch

2008

Analyzing Hardwood Vessel Content and its Interrelation with Offset Picking

Hirn, U. & Bauer, W., 2008, In : Papir. 36, 2, p. 29-31

Research output: Contribution to journalArticleResearch

Measuring the bonded area of individual fiber-to-fiber bonds

Kappel, L., Hirn, U., Bauer, W. & Schennach, R., 2008, In : Papíripar. LII, 6, p. 246-250

Research output: Contribution to journalArticleResearch

Registration and point wise correlation of local paper properties

Hirn, U., Lechthaler, M. & Bauer, W., 2008, In : Nordic pulp & paper research journal. 23, 4, p. 374-381

Research output: Contribution to journalArticleResearchpeer-review

2007

Refining aggregates

Eckhart, R., Hirn, U. & Bauer, W., 2007, In : IPW. 6, p. 45-46 2 p.

Research output: Contribution to journalArticleResearchpeer-review

Refining
Fibers
Pulp
Cones
Industrial applications
2006

A Review of Image Analysis Based Methods to Evaluate Fiber Properties

Hirn, U. & Bauer, W., 2006, In : Lenzinger Berichte. 86, p. 96-105

Research output: Contribution to journalArticleResearch

Open Access
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