Evaluation of the manufacture of sound absorbent sandwich plank made of PET/TPU honeycomb grid/PU foam

Abstract

In this study, the sandwich plank consisted of 7D polyethylene teraphthalate (PET), thermoplastic polyurethane (TPU) honeycomb grid, and polyurethane (PU) foam; 7D PET and 4D low melting polyester fibers were needle-punched and thermal-treated so as to form the PET nonwoven layer. The PU foam was foamed with a different density in the mold so as to form the PU foam layer with a different thickness. Finally, PET nonwoven layer, TPU honeycomb grid, and PU foam layer comprised the PET/TPU/PU sandwich plank. The results indicated that the sound absorption coefficients of the specimens were over 0.93 for the frequencies ranging between 2000 and 4000 Hz.

Keywords

TPU honeycomb grid PU foam sound absorption coefficient two-microphone impedance tube

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