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US 6,585,921 B2Granted
Cardable fiber blend and a moldable fiber batt and the process for making a moldable fiber batt
AssigneeE. I. Du Pont de Nemours and Company
InventorAnil Kohli
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Abstract
The present invention provides a cardable fiber blend which forms a moldable fiber batt, the blend comprising fibers having a modulus of 550 g/denier or more with fibers of a thermoplastic polymer wherein the high modulus polymer fibers are all uncrimped fibers or a mixture of crimped and uncrimped fibers. The moldable batt is useful in making speaker cones.
Claims17
A process for forming a fiber batt comprising the steps of:
- (a) blending together high modulus polymer fibers having a modulus of 550 g/denier or more with fibers of a crimped thermoplastic polymer wherein the high modulus polymer fibers are all uncrimped fibers or a mixture of crimped and uncrimped fibers,
- (b) passing the blend through a device to open the fibers, and
- (c) forming the fibers into a batt.
An improved process for forming a speaker cone comprising the steps of:
- (a) blending together high modulus polymer fibers having a modulus of 550 g/denier or more with fibers of a crimped thermoplastic polymer wherein the high modulus polymer fibers are all uncrimped fibers or a mixture of crimped and uncrimped fibers,
- (b) passing the blend through a device to open the fibers,
- (c) forming the fibers into a batt,
- (d) heating a mold to about 200° F. and placing the batt in the mold to form a speaker cone,
- (e) applying a pressure of from 5 to 20 tons to the mold and heating the mold to about 380° F.,
- (f) allowing the mold to cool to about 200° F. before opening the mold to remove the speaker cone.
3 more elements
Dependencies are inferred from the claim text.