Mario LIMA, Rosa Maria VASCONCELOS, Maria Jose ABREU, Maria Elisabete CABEÇO SILVA

COMPARATIVE STUDY OF FRICTION COEFFICIENT IN NONWOVENS APPLIED FOR NON ACTIVE MEDICAL DEVICES

Surgical gowns are considered non active medical devices. They can be single-use or reusable and during an operation they are in constant contact with the human skin. Interaction with the human senses is therefore an important performance property. When touched by the human hand, friction is one of the first feelings and therefore friction coefficient is an important parameter. A patented laboratory instrument was designed at the University of Minho based on an innovative method of accessing friction coefficient of 2D surfaces (fabrics, nonwovens, soft papers). Unlike other methods, the instrument FRICTORQ is based on a rotary movement and therefore on the measurement of a friction reaction torque. A short description of the FRICTORQ instrument will be given as well as its fundamentals and working principle followed by a study, where a comparison of the coefficient of friction between three different materials for manufacturing surgical gowns was performed. The tested materials were two Spunlace nonwovens and one SMS (spunlaid-meltblowingspunlaid). The results of the experimental work are analysed using various tools, including SPSS14.0 statistical package and discussed on the light of the importance of friction to the performance of surgical gowns. Differences in friction coefficient were detected, associated to the manufacturing process, composition of the nonwoven materials and outer or inner-faces. Therefore, FRICTORQ measurements suggest that its results could be used as a comfort parameter since information related with tactile perception is obtained

Keywords:

Non Active Medical Devices Surgical gowns, Nonwoven, Frictorq, Friction coefficient,

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1. Kawabata, S., Niwa, M. and Wang, F., 1994, “Objective Hand Measurement of Nonwoven Fabrics”, Textile Research Journal, Vol. 64(10).
2. Gupta, B.S. and El Mogahzy, Y.E., 1991, “Friction in Fibrous Materials”, Textile Research Journal, pp: 547-555.
3. Kawabata, S., 1980, “The Standardisation and Analysis of Hand Evaluation”, 2nd. Ed., Textile Machine Society of Japan, Kyoto.
4. Bueno, M. A., Renner, M. and Durand B., 1998, “Tribological Measurement of the State of Surface Fabrics by a Contact and a Non contact Method”, Proceedings of the Conference Mechatronics’98, Sweden, pp: 703-708.
5. Lima, M. and Hes, L., 2002, Inventors/authors, Portuguese Patent Nº 102790, Title: “Método e Aparelho para a Determinação do Coeficiente de Atrito de Materias Sólidos Planos (Method and Instrument for the Measurement of the Coefficient of Friction in Flat Solid Materials)”, Date: 12th June 2002.
6. Nosek, S., 1993, “Problems of Friction in Textile Processes”, International Conference TEXTILE SCIENCE 93, TU Liberec, Czech Republic, pp: 4-5.
7. Phelan, R. M., 1970, “Fundamentals of Mechanical Design”, 3rd Edition, McGraw-Hill Book Company, pp: 267-270.
8. Lima, M. and Hes, L., Vasconcelos, R. and Martins, J., 2005, "FRICTORQ, Accessing Fabric Friction with a Novel Fabric Surface Tester", AUTEX Research Journal, Vol. 5(4), pp: 194-201.
9. Lima, M. and Hes, L., Vasconcelos, R. and Martins, J., 2005, “FRICTORQ, a Novel Fabric Surface Tester: a Progress Report”, Journal of Textile Engineering, The Textile Machinery Society of Japan, Vol. 51(3/4), pp: 40-46.
10. Marques Abreu, M.J., Cabeço-Silva, M.E., Schacher, L. and Adolphe, D.C., 2000, “The Influence of the Sterilisation in the Balance between Comfort vs. Barrier Properties of Surgical Protective Clothing”, Proceedings of the FiberMed Conference, Finland, pp: 146- 155.
11. Avril, R. and Filmer, K., 2000, “Increased Understanding and Improvement in the Manufacture and Testing of Spunbond & Spunbond Composites resulting in Enhanced Fabric Properties”, Proceedings of the FiberMed Conference, Finland, pp: 42-53.
12. Lutolf, P. E., 1999, “Wear and Laboratory Testing - OR Gowns Comfort Properties of Spunlace Nonwovens vs. Cotton Woven Fabrics”, Proceedings of the Index 99 Congress, Medical Session, Switzerland, 11 p.
13. Abreu, M. J., 2004, “Contribuição para o Estudo da Parametrização de Têxteis Hospitalares”, (Contribution for the Study of the Parameterization of Hospital Textiles), Guimarães, Universidade do Minho, June 2004, PhD thesis in co-supervision with the Université d´Haute Alsace, France.