Sound absorption sheet for motor vehicles and engine under cover for motor vehicles using sound absorption sheet
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United States of America Patent
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Feb 26, 2013
Grant Date -
Nov 10, 2011
app pub date -
Feb 10, 2010
filing date -
Feb 12, 2009
priority date (Note) -
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Abstract
A sound absorption sheet is constructed by both films which are made of a fire-retardant polyethylene resin and layered with each other. The film has a flat film portion and a large number of air bubble portions. The flat film portion is adhered at its rear face to the flat film from the side of the front face. A large number of air bubble portions are dispersed in a staggered arrangement with each other along the planar direction of the film and raised and formed cylindrically along the thickness direction of the flat film portion in a direction separating from the film.
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