US3725518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a tubular net product
Assignee: Leucadia Inc
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Filing: 1970-09-29
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Granted: 1973-04-03
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Expires: 1990-09-29
Abstract
Abstract A method is provided for producing a polymer product by extruding a tubular net and applying a finely divided material to the net to form a new product. In one embodiment the finely divided material may at least partially block the openings of the net. When the openings are partially blocked, the product may be biaxially oriented by applying a pressure differential between the interior and the exterior of the product immediately after extrusion. The pressure differential is maintained by the partial blockage of the openings in the extruding net to permanently stretch and orient the net.
Inventors
- 👤 B Gaffney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:30
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/345; B29C48/03; B29C48/05; B29C48/09; B29C48/13; B29C48/32; B29C48/325; B29C48/10; B29L; B29L2028/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
35 words
The method specified in claim 1 wherein the step of feeding a finely divided particulate material adjacent the tubular net includes the step of feeding the finely divided polymer to the interior of the tube.
Claim 2
Dependent Claim
32 words
The method specified in claim 1 wherein the step of feeding finely divided material adjacent the tubular net includes the step of feeding a particulate material to the interior of the tube.
Claim 3
Dependent Claim
32 words
The method specified in claim 1 wherein the step of feeding a finely divided material adjacent the tubular net includes the step of feeding a fibrous material to the said tube interior.
Claim 4
Dependent Claim
36 words
The method specified in claim 1 wherein the step of applying a pressure differential between the interior and exterior of the tubular net comprises the step of applying pressure to the interior of the tubular net.
Claim 5
Dependent Claim
15 words
The method specified in claim 1 which includes the step of biaxially orienting the product.
Claim 6
Dependent Claim
38 words
The method specified in claim 1 wherein the step of applying a pressure differential between the interior and exterior of the tubular net comprises the step of subjecting the interior of the tubular net to a reduced pressure.
Claim 7
Dependent Claim
31 words
The method as specified in claim 7 further comprising the step of increasing the air pressure in the interior of the extruding tubular net to help maintain the said pressure differential.
Claim 8
Dependent Claim
33 words
The method specified in claim 1 further comprising the step of treating the finely divided material with a non-stick agent to prevent the finely divided material from permanently bonding to the tubular net.
Claim 9
Dependent Claim
29 words
The method specified in claim 2 further comprising the step of heating the finely divided material to cause bonding between the tubular net and the said finely divided material.
Claim 10
Dependent Claim
28 words
The method specified in claim 1 further comprising the step of maintaining the tubular net at a temperature sufficient to cause the finely divided material to bond thereto.
Claim 11
Dependent Claim
36 words
The method specified in claim 5 further comprising the step of introducing the finely divided material above the point at which the air is admitted to the tubular net to help disperse the finely divided material.
Claim 12
Dependent Claim
63 words
The method specified in claim 5 further comprising the step of extruding the tubular net product into a liquid bath to provide buoyancy for the tubular net to prevent tearing the tubular net as it extrudes, and maintaining sufficient air pressure inside said tubular net to both orient said tubular net and maintain the interior of the tubular net substantially free from liquid.
Claim 13
Independent Claim
86 words
A method for biaxially orienting a polymer tubular net while it is extruding comprising the steps of supplying an electrically charged finely divided material adjacent the said tubular net, applying an electrostatic force field between the interior and the exterior of said tubular net to attract said electrically charged finely divided material to the tubular net to at least partially block the net openings, and applying a pressure differential between the interior and exterior of the tubular net to stretch and orient the said tubular net.
Claim 14
Dependent Claim
38 words
The method specified in claim 14 wherein the step of applying pressure differential between the interior and exterior of the tubular net comprises the step of applying a partial vacuum force to the exterior of said tubular net.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |