Microporous membrane laminate for acoustic venting
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United States of America Patent
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Jan 23, 2018
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app pub date -
Oct 14, 2014
filing date -
Oct 15, 2013
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Abstract
The technology described herein generally relates to a microporous membrane laminate for acoustic venting. In one embodiment, the technology disclosed herein is a polytetrafluoroethylene (PTFE) membrane having an average pore size between 0.05 μm and 2 μm and a scrim layer laminated to the PTFE membrane to form an acoustic membrane laminate. The acoustic membrane laminate has a thickness between 10 μm and 60 μm, and the scrim layer defines an average scrim opening between 0.20 mm2 and 5.0 mm2. The acoustic membrane laminate exhibits an increased average insertion loss in a frequency range from 300 Hz to 3000 Hz compared to the PTFE membrane alone, and has a decreased total harmonic distortion relative to the PTFE membrane alone. The acoustic membrane laminate has a water entry pressure that is substantially equal to that of the PTFE membrane.
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