US4085175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a balanced nonwoven fibrous network by radial extrusion and fibrillation
Assignee: Applied Extrusion Technologies Inc
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Filing: 1975-09-15
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Granted: 1978-04-18
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Expires: 1995-09-15
Abstract
Abstract Self-bonded, balanced nonwoven fibrous fabrics having fibers uniaxially oriented and junction points of biaxially oriented film tissue and fibers in the plane of the fabric, the fibers being primarily oriented in the machine direction with the biaxially oriented film tissue being oriented in the cross direction. The nonwoven fabrics are produced by extruding a molten polymer radially from a circular die, quenching and then drawing the extrudate.
Inventors
- 👤 Herbert W. Keuchel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
D; D04; D04H; D04H13/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/08; Y10S425/00; Y10S425/053; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A process for producing a nonwoven fibrous network comprising extruding a mixture of a molten thermoplastic polymer and a foaming agent radially under compression through a circular die having a die gap substantially transverse to the axis of the die head, applying radial stress to said molten thermoplastic polymer to attenuate said molten thermoplastic polymer to form a molten fibrous cellular extrudate, maintaining radial stress over the entire molten fibrous extrudate to further attenuate said fibrous extrudate, quenching said extrudate to a temperature below its melting or flow temperature and further radially stretching said extrudate to provide a balanced nonwoven fibrous network.
Claim 2
Dependent Claim
102 words
A process for producing a nonwoven fibrous network comprising extruding a mixture of a molten thermoplastic polymer and a foaming agent radially under compression through a circular die having a die gap substantially transverse to the axis of the die head, applying radial stress to said molten thermoplastic polymer to attenuate said molten thermoplastic polymer to form a molten fibrous cellular extrudate, maintaining radial stress over the entire molten fibrous extrudate to further attenuate said fibrous extrudate, quenching said extrudate to a temperature below its melting or flow temperature and further radially stretching said extrudate to provide a balanced nonwoven fibrous network.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the concentration of the foaming agent ranges from about 0.25 to 10 percent by weight of the thermoplastic polymer.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the extrudate is finally stretched at an angle of from 75° to 125° in relation to the direction of radial extrusion.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the extrudate is radially stretched at an angle of from 85° to 95°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |