Influence of sea polymer removal on sound absorption behavior of islands-in-the-sea spunbonded nonwovens

Abstract

This work presents the results of efforts focused on the development of relatively lightweight and fibrous acoustic webs. For this objective, nonwoven webs that contain bicomponent filaments with islands-in-the-sea cross sections were produced by spunbonding, which involves the extrusion of sea and island polymer melts through dies, cooling and attenuating the bicomponent filaments by high-velocity air streams. Nylon 6 and polyethylene were used as the island and sea polymers, respectively. Webs were hydroentangled with high-pressure water jets prior to the dissolving process to obtain fiber entanglement. Sea polymer was removed from the spunbonded nonwovens by using a reflux dissolution setup. Weight, thickness, air permeability, pore size and sound absorption coefficients of the nonwoven samples were measured before and after the sea polymer removal. Results demonstrated that sea polymer removal led to further bicomponent filament fibrillation, which affected sound absorption positively. The structure with the higher number of island fibers had better acoustical properties. Lightweight and fibrous acoustic nonwovens can be obtained with the method given in this study.

Ultralight and Resilient Electrospun Fiber Sponge with a Lamellar Corrugated Microstructure for Effective Low-Frequency Sound Absorption

“…Ultrafine-fiber fluffy assemblies possess large surface areas and sophisticated channels inside; thus, they could provide abundant contact areas and a long propagation path for sound waves, which is beneficial to the sound energy consumption. , In addition, the hierarchical structures of the fluffy ultrafine-fiber assemblies could also equip them with the lightweight property. Thus, three-dimensional (3D) ultrafine-fiber products are promising for noise reduction in the field of vehicles .…”

Acoustic Behaviour of Nonwovens

“…After removing the sea polymer, spun bonded nonwovens contain only thin island fibers and also get lighter. Sea polymer removal leads to further bicomponent filament fibrillation, especially for the spun bonded webs processed at lower hydro entangling energies (one and two passes) [29]. that dissolution method given in this study can be used to form lightweight and fibrous sound absorptive spun bonded nonwovens.…”

Sound absorption property of hierarchical three-dimensional flat-knitted spacer fabric with microfiber

“…The pore size of spacer fabric was measured by a capillary flow porometer (CFP-1100A). 26 At least three samples were tested for each fabric, the sample size was 45 mm  45 mm, and the infiltrating liquid was anhydrous ethanol.…”