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US 2006/0234590 A1Published application
Broad spectrum sound insulation
OwnerRowland Griffin, John Fieldinventors
Life of this patent
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Abstract
Sound insulation core material is made by melt-blowing a polypropylene resin having a hydroxystearamide wax additive to produce a fibrous mass having improved loft. The core material is encased between outer layers of spun-bond polyethylene fibers by longitudinal seams and transverse seams to form a product suitable for use in dishwashers.
Claims15
A method of producing sound insulation having high loft, said method comprising steps of
- adding a wax additive to a polypropylene resin to form a mixture, and then
- extruding said mixture through nozzles onto a moving surface at a temperature and pressure such that a melt-blown fiber mass results,
- wherein said wax additive is a hydroxystearamide wax and is present in an amount sufficient to inhibit thermal bonding between fibers.
The method of claim 13, wherein the amount of said additive is 0.4% to 0.6% by weight of the amount of the resin.
Sound insulation having high loft, made by a method comprising steps of
- adding a wax additive to a polypropylene resin to form a mixture, and then
- extruding said mixture through nozzles onto a moving surface at a temperature and pressure such that a melt-blown fiber mass results,
- wherein the wax additive is present in an amount sufficient to inhibit thermal bonding between fibers.
Dependencies are inferred from the claim text.