US4085486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing needled, non-woven tubing
Assignee: Rontex America Inc
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Filing: 1976-04-19
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Granted: 1978-04-25
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Expires: 1996-04-19
Abstract
Abstract A method for continuously producing needled, non-woven tubing by winding a web on a stationary mandrel, multi-needling overlying turns and frictionally driving the formed tube about the periphery of the mandrel. The mandrel is tapered to accommodate shrinkage of the tube and to assist ejection of the formed tube without application of longitudinal tension on the formed tube. The mandrel preferably includes a helical surface for progressively ejecting the rotating tubing from the static mandrel. The tube product may be formed with diameters as low as 4 millimeters and walls as thin as 0.5 millimeters and is radially compressed immediately after needling.
Inventors
- 👤 Richard Dilo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:18
CPC Classifications
D; D04; D04H; D04H18/00; D04H1/00; D04H1/70; D04H1/76; D04H18/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
The method of making non-woven tubing comprising: (a) winding at least one non-woven web of fibers at an angle forming a helix of at least partially overlapping turns, (b) needling a multiplicity of fibers from each turn transversely through at least one subjacent turn to fasten said turns to each other, (c) permitting said needled turns to shrink substantially radially, (d) radially compressing said needled turns, and (e) continuously ejecting said needled turns from said winding step by compression thereof against a helical surface generally parallel to the direction of ejection while rotating one of said helical surface and said needled turns with respect to the other.
Claim 2
Independent Claim
107 words
The method of making non-woven tubing comprising: (a) winding at least one non-woven web of fibers at an angle forming a helix of at least partially overlapping turns, (b) needling a multiplicity of fibers from each turn transversely through at least one subjacent turn to fasten said turns to each other, (c) permitting said needled turns to shrink substantially radially, (d) radially compressing said needled turns, and (e) continuously ejecting said needled turns from said winding step by compression thereof against a helical surface generally parallel to the direction of ejection while rotating one of said helical surface and said needled turns with respect to the other.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which said needled turns are rotated about a stationary mandrel.
Claim 4
Dependent Claim
21 words
The method of claim 2 in which said needled turns are compressed radially inwardly against helical surface on said stationary mandrel.
Claim 5
Dependent Claim
20 words
The method of claim 2 in which said web is radially pressed against said mandrel prior to said needling step.
References Cited (Backward Citations)
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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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |