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US 11,900,907 B2Granted
Dual density acoustic insulation
AssigneeHobbs Bonded Fibers NA, LLC
InventorKarl VanBecelaere
Life of this patent
Estimating the term…
Abstract
A dual layer nonwoven acoustic insulating material having a more densified layer and a less densified layer that is comprised of shoddy fibers and other fibers.
Claims20
An acoustic insulation material that is a nonwoven felt sheet comprised of:
- a mixture of shoddy fibers, low melt binder fibers, and polyester fibers that has gone through a first needling step;
- a first layer of the nonwoven felt sheet that is a layer with a certain thickness;
- a second layer of the nonwoven felt sheet that is a layer comprised of the remaining thickness of the sheet;
- wherein the first layer has greater density than the second layer.
1 more element
An acoustic insulation material that is a nonwoven batt comprised of:
- shoddy fibers, low melt binder fibers, and polyester fibers that have undergone an initial needle punching operation;
- wherein a first region comprising one-third (⅓) to one-half (½) of the thickness of the batt has greater density than a second region comprising the remaining two-thirds (⅔) to one-half (½) of the thickness of the batt.
An acoustic insulation material that is a nonwoven material comprised of:
- a first region comprised of a first thickness of the material;
- a second region comprised of a second thickness of the material;
- wherein the first region is denser than the second region;
- wherein the greater density of the first region is a result of a purely mechanical process during manufacturing of the nonwoven material.
1 more element
Dependencies are inferred from the claim text.