Nonwoven Hollow Fibers to Improve Cars Interior Acoustic Properties

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  • Topic: Textile, Polyester, Acoustics
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RJTA Vol. 16 No. 3 Aug 2012

Using Nonwoven Hollow Fibers to Improve Cars Interior Acoustic Properties Abdelfattah, A. Mahmoud1, Ghalia E. Ibrahim2* and Eman R. Mahmoud3 1 Acoustic Department, National Institute for Standards, Giza, B.O.136, Code no. 12211, Egypt 2,3 Spinning, Weaving and Knitting Department, Faculty of Applied Arts, Helwan University, Egypt

ABSTRACT
This research aims to produce nonwoven fabrics that can be used in car interior components (head liners, doors, side panels and trunk liners) to prevent noise from reaching the passenger compartment and therefore achieving comfort in the car interior. Two kinds of fibers were used, polyester and hollow polyester fibers, both of 6 denier, to produce three different fabrics of 100% polyester fibers, 75% polyester/25% hollow polyester fibers, and 55% polyester45% hollow polyester fibers. Four fabric weights were produced: 300, 400, 500 and 600 g/m2. All samples were bonded using thermal bonding technique. More results were reached and most samples have achieved the expected results for example, samples produced with high percentage of hollow fibers have recorded the highest rates of sound absorption whereas samples produced with 100% polyester fibers have recorded the lowest rates. It was also found that there is a direct relationship between weight per m2 and sound absorption efficiency. Samples produced with 55% polyester/45% hollow polyester fibers and 600 g/m2 have achieved the best results. Keywords: Nonwoven Fabrics, Hollow Fibers, Cars Interior Acoustic Properties, sound Insulation

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Introduction
frequently used in automotive interiors to reduce heat levels (Imfeld et al.) as customers expect more comfort, better safety, good appearance (both externally and internally), high performance and good fuel mileage (Mukhopadhyay, 2000). Textiles make a major contribution towards realizing customers’ expectations due to their advantages which made textiles a preferable material because of their high capacity to take moisture, adjustable porosity, high-pile fibrous surface, low-cost recycling, and the flexibility and diversity in combining textiles with other materials. (Bottcher, 2005). Due to the diverse product range, automotive textiles can be classified into upholstery and carpeting (Desai ,2005) which have a decisive influence on acoustic comfort (Laser, 1997) interior components such as head liners, and doors and side panels (Desai, 2005) which are foam backed components to achieve easier installation and improve acoustical properties (Waugh, 1986) and tyres, safety devices (such as seat belts and airbags), filters and engine compartment items (Desai, 2005).

When talking about textiles, most people think of clothing, home textile and the like. Only few think about the automotive industry (Wilkens, 2005). In fact, automotive textiles are considered one of the most important markets in the technical textiles sector (Mukhopadhyay, 2000). Over the last decades, the field of non-conventional textiles has been witnessing a material revolution which has resulted in improved and economical products (Tilgul, 1990). The automotive industry has become so competitive that manufacturers are reluctant to divulge precise details of their process for fear that textiles are widely used in transportation vehicles and systems, including cars, trains, buses, airplanes, and marine vehicle (Fung and Hardcastle , 2001) automotive textiles are growth markets in terms of quantity, quality and product variety (Parikh et al., 2002). it could be helpful to their competitors. Industrial Motor vehicle remains an important means for individual transport worldwide. The interior of transportation vehicles is receiving more attention these days. Acoustical insulation products are * Corresponding author. Tel.: 0020105199359, Fax 0096664224273 E-mail address: ghalia1980@yahoo.com (Ghalia El-Shenawy)

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RJTA Vol. 16 No. 3 Aug 2012

1.1. Noise in Cars Noise has become...
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