THREE-DIMENSIONAL SHAPED NONWOVEN STRUCTURES FOR ACOUSTIC INSULATION AND PRODUCTION METHOD THEREOF
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United States of America Patent
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Issued Date -
Feb 28, 2013
app pub date -
Dec 7, 2009
filing date -
Nov 27, 2009
priority date (Note) -
Abandoned
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Abstract
A three-dimensional (3D) nonwoven structure is provided having fibers oriented in different directions and superficial shapes in predefined areas. The structure comprises at least three layers, a top layer, a bottom nonwoven layer and a randomly oriented fiber layer, connected with fibers in predefined areas. The layers are connected using a special technique based on the needle board configuration of the needle-punching machine, and may be needled with different needle positions. A special needle loom feeding system to feed the different layers and to produce the product is also disclosed.
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