Surface Coating of Needle-Punched Nonwovens with Meltblown Nonwovens to Improve Acoustic Properties

Abstract

Unlike the term sound insulation, which means reducing the penetration of noise into other areas, sound absorption means reducing the reflection and energy of the sound on the surface. It has become a highly noticed issue in recent years because the noise in our daily life is increasing day by day, and it causes some health and comfort disorders. In many areas, textiles have been used for acoustics control and noise absorption purposes. The purpose of this work is to determine the most effective media for sound absorption performance and its relation to thermal conductivity from needle-punched nonwoven, meltblown nonwoven and hybrid forms in different arrangements of these fabrics. To provide comparable samples, both needle-punched nonwoven and meltblown nonwoven samples were produced from 100% Polypropylene fibres. According to sound absorption tests, the hybrid-structured sample having a composition similar to the needle-punched nonwoven sample placed at the bottom of our study, while the meltblown nonwoven sample placed as a face layer outperformed the rest of the samples in terms of sound absorption and thermal conductivity. ‘Meltblown only’ samples had remarkably higher sound absorption efficiency than most of the samples, while the ‘needle-punched nonwoven only’ sample had the lowest sound absorption efficiency in all frequencies.

Study on the Sound Absorption Properties of Recycled Polyester Nonwovens through Alkaline Treatment and Dimple Processing

“…The sheath-core LM PET staple fiber and rPET staple fiber, both 4 deniers and 51 mm in length, were provided by Huvis Co., Ltd. (Daejeon, South Korea). These two staple fibers were mixed at a content ratio of 2:8 to prepare a nonwoven fabric through needle punching [33]. Concerning the sound-absorbing material, the nonwoven fabric was cut into 14 × 14 cm 2 pieces, and 10 layers were stacked at 210 • C and 95 psi for 5 min using a hot press, followed by an additional 20 min of pressurization.…”

Assessing the Sound and Heat Insulation Characteristics of Nonwoven Composite Structures: Evaluation of Polypropylene (PP)/Polybutylene Terephthalate (PBT) Meltblown, Polyamide Nanofiber Inner Layers and Recycled Polyester (r-PET) Thermo Bonded Outer

“…The large tube is employed for the 50 Hz-1600 Hz sound frequency range, whereas the small tube is utilized for the 1600 Hz-6300 Hz frequency range. The sample diameters for the large and small tubes are 100 mm and 29 mm, respectively [82,103]. The results derived from the tests were statistically analyzed by using Design Expert software.…”

“…Meltblown nonwovens can be economically manufactured representing lighter nonwoven fabrics with reduced fiber and pore diameter, increased surface area. This material offers an effective alternative for sound absorption management compared to the bulky needle-punched nonwoven sound absorbers available commercially or materials including nano fibers [7,11,58,82,83]. Some studies related with sound insulation features of nonwoven composites evaluated the Polypropylene (PP) [11,58,83], Polylactic Acid (PLA) [11,47], Polyethylene terephthalate (PET) [7] and PP/Pet bicomponenet fiber [83] based meltblown layers.…”

“…Sivri and Haji [82] identified the most efficient medium for sound absorption performance, exploring various arrangements of polypropylene-based needle-punched nonwoven, polypropylene melt-blown nonwoven, and hybrid forms, and examining their correlation with thermal conductivity. Composite structure where the melt blown nonwoven with lowest fiber diameter placed at the face side of needle punched nonwoven found to provide highest sound absorption coefficient, nonetheless sound absorption was inadequate for sounds with medium and low frequencies.…”

A Fiber Sliding–Orientation Based Micromechanics Failure Model for Melt-Blown Nonwovens

“…Melt-blown technology refers to the one-step production of microfiber nonwovens based on hot airflow stretching polymer melt. , Nowadays melt-blown nonwovens (MNs) made with fine fiber diameter, small pore size, and high porosity are commonly used in filtration, − adsorption, − thermal insulation, , sound absorption, − and other fields because of the benefits of the quick production process, high production efficiency and solvent-free. For instance, in the realm of air filtration, polypropylene MNs may efficiently block germs and particle pollution as the core filter layer of masks, safeguarding people’s health all over the world. − MNs, however, are frequently coupled with other skeletal materials to satisfy the mechanical demands of commercial applications. ,− In addition to adding to the production time and expense of melt-blown, the composite technique also goes against consumer desire for comfort and lightness. ,, To address this problem, considerable research efforts have been devoted recently to improving the mechanical behavior of MNs through polymer modification, − fiber formation, − and posttreatment. , However, because of the random organization, irregular diameter, and poor interlayer bonding of the fibers in MNs, it is challenging to further improve their mechanical characteristics.…”