US3746485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of net-like structures
Assignee: Dow Chemical Co
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Filing: 1971-04-22
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Granted: 1973-07-17
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Expires: 1991-04-22
Abstract
Abstract This invention relates to apparatus for the production of thermoplastic net comprising bonded filaments which have at least two different thermoplastic components disposed in generally spirally arranged alternating layers wherein the material of one of the layers is mono-directionally oriented and the remaining material is generally unoriented.
Inventors
- 👤 W Schrenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:29
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/03; B29C48/05; B29C48/09; B29C48/13; B29L; B29L2028/00; Y; Y10; Y10S; Y10S264/00; Y10S264/81
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
229 words
An apparatus for the extrusion of synthetic resinous thermoplastic net, wherein the individual filaments of the net comprise diverse intertwined polymer compositions, the apparatus comprising in cooperative combination means to supply a first stream of heat plastified material, means to supply a second stream of a heat plastified material, a housing defining an internal generally cylindrical passageway having a first end and a second end, the housing defining a first plurality of passageways providing communication between the first end of the passageway and the first polymer supply means, a second plurality of passageways providing communication between the second polymer supply source and the first end of the annular passageway, the passageways communicating with the first polymer source being in generally alternating arrangement with the passageway communicating with the second polymer source, a rotor having a first end and a second end, the rotor being rotatably mounted within the housing passageway, the housing and the rotor defining an annular passageway, the first end of the rotor being disposed adjacent a first end of the passageway, the second end of the rotor being disposed adjacent the second end of the passageway, the housing defining a plurality of extrusion apertures adjacent the second end of the passageways, the rotor defining a plurality of extrusion orifices adjacent the second end of the rotor, and means to rotate the rotor relative to the housing.
Claim 2
Independent Claim
229 words
An apparatus for the extrusion of synthetic resinous thermoplastic net, wherein the individual filaments of the net comprise diverse intertwined polymer compositions, the apparatus comprising in cooperative combination means to supply a first stream of heat plastified material, means to supply a second stream of a heat plastified material, a housing defining an internal generally cylindrical passageway having a first end and a second end, the housing defining a first plurality of passageways providing communication between the first end of the passageway and the first polymer supply means, a second plurality of passageways providing communication between the second polymer supply source and the first end of the annular passageway, the passageways communicating with the first polymer source being in generally alternating arrangement with the passageway communicating with the second polymer source, a rotor having a first end and a second end, the rotor being rotatably mounted within the housing passageway, the housing and the rotor defining an annular passageway, the first end of the rotor being disposed adjacent a first end of the passageway, the second end of the rotor being disposed adjacent the second end of the passageway, the housing defining a plurality of extrusion apertures adjacent the second end of the passageways, the rotor defining a plurality of extrusion orifices adjacent the second end of the rotor, and means to rotate the rotor relative to the housing.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein the inner portion of the housing defining the annular passage is rotatably disposed within the housing.
Claim 4
Dependent Claim
34 words
The apparatus of claim 1 wherein the extrusion orifices of the rotor and of the housing are so positioned as to periodically coincide when the rotor and housing are rotated relative to one another.
Claim 5
Dependent Claim
42 words
The apparatus of claim 1 wherein the passageways in communication with the first polymer source have a dimension in a direction normal to the axis of the cylindrical passageway greater than that of the passageways in communication with the second polymer source.
Claim 6
Dependent Claim
60 words
The apparatus of claim 1 wherein the housing defines at least a first annular plenum and a second annular plenum, the first plenum being in communication with the means to supply the first heat plastified stream and the annular passageway, usually the second plenum being in communication with the means to supply the heat plastified stream and the annular passageway.
References Cited (Backward Citations)
US3130959A
Cited
US3308220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |