Patent US3930923A successfully refreshed from Google Patents.
US3930923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nylon extrusion coating
Assignee: BRH Corp
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Filing: 1972-10-04
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Granted: 1976-01-06
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Expires: 1992-10-04
Abstract
Abstract Nylon resins are extrusion coated onto various substrates for the manufacture of coated packaging films by heating the nylon resin to a melt temperature of 450°-550°F, extruding the molten resin onto a chill roll through a die which is set at an angle to the chill roll, employing sub-atmospheric pressure between the extruder die and the chill roll, rapidly cooling the extruded film on the chill roll to form a substantially amorphous nylon, and thereafter joining the nylon to a substrate.
Inventors
- 👤 Bentley W. Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:37
CPC Classifications
B; B32; B32B; B32B27/00; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/916
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
178 words
An extrusion coating process for the production of flexible packaging films of nylon coated substrates consisting of the steps of: 1. heating nylon in an extruder to a melt temperature of 450° to 550°F, and discharging the nylon as a molten web through an extruder die onto the periphery of a rotating chill roll; 2. arranging the extrusion die at an angle to the chill roll such that the molten nylon web is perpendicular to the lips of the extrusion die when it leaves the die and, further, such that the molten nylon web tangentially contacts the surface of the chill roll; 3. subjecting the zone between the molten nylon web and the underlying surface of the chill roll to sub-atmospheric pressure; 4. rapidly cooling the extruded nylon on the surface of the chill roll to under 200°F to form a nylon web with a volume crystallinity of 35% or less; then 5. withdrawing the cooled nylon web from the chill roll, and thereafter joining the nylon to a substrate web to thereby form the completed packaging film.
Claim 2
Dependent Claim
178 words
An extrusion coating process for the production of flexible packaging films of nylon coated substrates consisting of the steps of: 1. heating nylon in an extruder to a melt temperature of 450° to 550°F, and discharging the nylon as a molten web through an extruder die onto the periphery of a rotating chill roll; 2. arranging the extrusion die at an angle to the chill roll such that the molten nylon web is perpendicular to the lips of the extrusion die when it leaves the die and, further, such that the molten nylon web tangentially contacts the surface of the chill roll; 3. subjecting the zone between the molten nylon web and the underlying surface of the chill roll to sub-atmospheric pressure; 4. rapidly cooling the extruded nylon on the surface of the chill roll to under 200°F to form a nylon web with a volume crystallinity of 35% or less; then 5. withdrawing the cooled nylon web from the chill roll, and thereafter joining the nylon to a substrate web to thereby form the completed packaging film.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein: the nylon is cooled to a temperature below 150°F on the chill roll.
Claim 4
Dependent Claim
35 words
The process of claim 1, wherein: the zone between the molten nylon web and the underlying surface of the chill roll is subjected to sub-atmospheric pressure of 1 to 2 below the ambient atmospheric pressure.
Claim 5
Dependent Claim
21 words
The process of claim 1, including the step of: cooling the surface of the chill roll to about 90°F to 120°F.
Claim 6
Dependent Claim
49 words
The process of claim 1, including the step of: subjecting a surface of the nylon web to corona discharge treatment after it is withdrawn from the chill roll and before it is joined to the substrate, and then joining the treated surface of the nylon web to the substrate.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein: the nylon is cooled on the chill roll to a volume crystallinity of about 23%.
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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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |