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Sound absorption property of nonwoven based composites

Gliścińska E., Michalak M., Krucińska I.

Autex Research Journal

2013

Vol. 13, no. 4

150--155

Sound absorbing materials used to provide optimal conditions in rooms can be applied in the form of textiles with a special structure such as nonwovens or fibre-containing composites. Nonwovens can be successfully used to make thermoplastic composites by thermal pressing. This paper presents the comparison of the sound absorbing properties of needled nonwovens and composites made from them. Composites with various densities can be made of nonwovens with various percentage contents of filling and matrix fibres. The sound absorption by composites with similar thickness, about several millimetres, is slightly lower than that by the laminar nonwoven packs used for their making. The optimal content of the filling fibres in the composite, when its sound absorption coefficient reaches the highest values, is at the level of 10 wt.%. With the increase in the content of filling fibres the composite density decreases. In the case of the composite with 10 wt.% of filling fibres, its density is the highest among the composites investigated, and the increase in absorption of high-frequency sounds is the highest. Imparting a relief with a protrusion diameter over 10 mm to the composite surface, we can increase the sound absorption of that composite.

Evaluation of Bending Modulus of Needle-Punched Fabrics Using Two Simply Supported Beam Method

Ghane M., Saghafi R, Zarrebini M, Semnani D.

Fibres & Textiles in Eastern Europe

2011

Vol. 19, no. 4 (87)

89--93

In this work the effect of needle-punching parameters, such as the punch-density and depth of needle penetration on the bending properties of polypropylene needled fabrics was investigated. Four samples of needled fabrics were produced using conventional Carding/ Cross-lapping machines. The bending stiffness of the samples was evaluated in the machine-direction using the two simply supported beam and simple cantilever methods. The results indicate that the bending modulus of the fabrics are affected by both the amount of the punch density and depth of needle penetration. The results also revealed that the values of bending modulus obtained by the two simply supported beam method are greater than those obtained by the cantilever method, which is due to the nonlinear nature of the moment-curvature relation of the bent fabric.

W pracy zbadano wpływ parametrów igłowania włóknin takich jak gęstość igłowania i głębokość penetracji na sztywność uzyskanego produktu. Wyprodukowano cztery próbki wykorzystując konwencjonalne zgrzeblarki. Sprawdzano moduł sztywności zginania w kierunku przerobu, stosując metodę dwóch punktów podparcia. Wyniki wykazały, że moduł sztywności zależy od obydwu zmienianych parametrów produkcyjnych. Stwierdzono również, że wyniki uzyskane stosowaną metodą są wyższe niż otrzymane przy metodach z zastosowaniem prostej dźwigni. Wynika to z nieliniowości badanych zależ