Heide, E. van der

Rodriguez Urribarri, A.C.

Römer, G.R.B.E.

Zeng, X.

Rodriguez Urribarri, Adriana

Zeng, Xiangqiong

Römer, Gerardus Richardus, Bernardus, Engelina

van der Heide, Emile

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The role of human skin condition on active touch of wood and polymers

University of Twente Research Information

The role of human skin condition on active touch of wood and polymers dr. Lydia Zeng prof.  Emile van der Heide Adriana Rodríguez Urribarrí   MSc.  Wood surfaces Polymer surfaces A. C. Rodríguez Urribarrí 1*, X. Zeng1, G.R.B.E. Römer 2 and E. van der Heide 1,3 1 Laboratory of Surface technology and Tribology, University of Twente, NL    2Applied Laser Technology, Faculty of Engineering Technology, University of Twente, NL    3 TNO, NL                            *contact: a.c.rodriguezurribarri@utwente.nl Introduction Friction, surface finish and moisture between the human skin and a surface are critical factors influencing the sensation of comfort or discomfort generated during active touch.  The sensation of comfort is in many cases associated to the feel of organic materials such as wood. Therefore, there is an increased interest to develop polymeric materials with similar touch properties.        Figure 1. Tactile experience during touch [1].   Objective This study was conducted to analyse the friction response during tactile touch of wood and polymers, such as the static and dynamic friction coefficients, as a function of the skin condition.   Method • In vivo friction measurements were carried out on ‘as received’ and surface modified samples of hardwood and softwood. • Polymer samples with random like and deterministic (laser textured - grooves) surface patterns were selected for further comparison.         Figure 2. In vivo friction measurements. Static vs dynamic friction coefficients as a function of the skin condition        Natural wood vs polymer random like and deterministic surfaces       Results • µStatic and µdynamic from wood samples ranged from 0.25 to 0.45 and 0.2 to 0.4 respectively under dry condition.  • Polyethylene and Polypropylene samples showed dynamic friction coefficients of similar values to that of the wood samples.  • Polyamide 12 and Polyamide 66 exhibited static friction coefficients of similar range of values to that obtained with the wood samples.  Conclusions • µStatic obtained for selected wood samples in dry and wet condition were not always higher than µdynamic.  • Friction coefficients of wood samples were found in agreement with two kinds of polymer samples.   dr. Gert-Willem Römer 0.000.100.200.300.400.500.600.00 0.50 1.00 1.50 2.00µ [-] Time [s] STD µStatic µDynamic Deterministic polymer surfaces 0.000.100.200.300.400.500.600.70Static Dynamic Static DynamicDry skin Wet skinµ [-] Skin condition WoodPolymersAcknowledgements European Fund for Regional Development: GO EFRO 209-18331.  References [1] 2007. Life: The science of biology, 8th Edition: http://bcs.whfreeman.com/thelifewire8e/ 

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http://doc.utwente.nl/91604/1/AC%20Rodriguez%20-%20ICoBT2014-Canada%20conference-v2.pdf

The role of human skin condition on active touch of wood and polymers

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