Patent US3630824A successfully refreshed from Google Patents.
US3630824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow monofilament of high-loading capacity and method of making same
Assignee: Oerlikon Barmag AG
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Filing: 1969-05-19
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Granted: 1971-12-28
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Expires: 1989-05-19
Abstract
Abstract Process for producing an industrial monofilament of a fiberforming thermoplastic polymer in which the polymer is melt spun as a hollow filament into an aqueous bath and withdrawn therefrom through a hot air zone while stretching in both the bath and the hot air zone to reduce the hollow cross section to less than 15 percent and especially less than 3 percent of the total cross section. The resulting monofilaments with a relatively fine hollow channel and outer diameters between about 0.8 and 8 mm. are useful for making nets, ropes, fishing lines and the like.
Inventors
- 👤 Gunter Rohlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:09
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/31504; Y10T428/31725; Y10T428/31739; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
26 words
A monofilament as claimed in claim 1 wherein said hollow cross section occupies about 0.5 to 10 percent of the total cross section of the monofilament.
Claim 2
Dependent Claim
25 words
A monofilament as claimed in claim 1 wherein said hollow cross section occupies less than 3 percent of the total cross section of the monofilament.
Claim 3
Dependent Claim
10 words
A monofilament as claimed in claim 1 composed of polypropylene.
Claim 4
Dependent Claim
10 words
A monofilament as claimed in claim 1 composed of nylon.
Claim 5
Dependent Claim
13 words
A monofilament as claimed in claim 1 having a substantially circular cross section.
Claim 6
Dependent Claim
150 words
A process for the production of an industrial monofilament of a synthetic, fiber-forming, linear thermoplastic polymer which comprises: melt-spinning a hollow monofilament of said polymer by extrusion through an annular opening around one end of a coaxial and concentric small hollow tube which is in fluid communication with the outside atmosphere at its opposite end; withdrawing the spun hollow monofilament through an aqueous cooling bath for solidification of the polymer while imparting a first stretch sufficient to partly reduce the inner and outer diameter of the monofilament; and further withdrawing the solidified and partly stretched monofilament through a hot air zone while imparting a second stretch, the size of the initially spun monofilament and the amount of stretching imparted thereto being sufficient to reduce the outer diameter to about 0.8 to 8 mm. and the inner diameter to a value of about 0.1 to 15 percent of the outer diameter.
Claim 7
Dependent Claim
32 words
A process as claimed in claim 7 wherein the spun hollow monofilament is stretched sufficiently to reduce the inner diameter to a value of less than 3 percent of the outer diameter.
Claim 8
Dependent Claim
13 words
A process as claimed in claim 7 wherein the thermoplastic polymer is polypropylene.
Claim 9
Dependent Claim
13 words
A process as claimed in claim 7 wherein the thermoplastic polymer is nylon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |