US4486377A
Expired / Lapsed
US
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Process for reducing draw resonance in polymeric film
Assignee: Union Carbide Corp
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Filing: 1982-09-27
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Granted: 1984-12-04
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Expires: 2002-09-27
Abstract
Abstract A process for producing polymeric film substantially free of draw resonance under conditions and at rates which would otherwise cause draw resonance in polymeric film susceptible to draw resonance wherein a fluid medium is directed against the moving film at a location between the extrusion die and the film take-up zone.
Inventors
- 👤 Peter J. Lucchesi
- 👤 Stuart J. Kurtz
- 👤 Ernest H. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:27
CPC Classifications
B; B29; B29C; B29C55/00; B29C43/00; B29C43/22; B29C43/222; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9155; B29C48/001; B29C48/0018
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
123 words
A process for reducing draw resonance of a polyolefin molten film susceptible to draw resonance under conditions which would cause draw resonance by extruding the molten film from a die and rapidly cooling said molten film in a rapid cooling zone containing a pressure roll and chilling roll, which comprises contacting said molten film transversely across the surface of said molten film with a gas selected from nitrogen, carbon dioxide, or air at a site substantially midway between said die and the nip of said pressure roll and chilling roll said gas being directed against said molten film at a velocity of about 1 to 150 feet per minute and in an amount sufficient to reduce draw resonance in said molten film. pg,39
Claim 2
Dependent Claim
123 words
A process for reducing draw resonance of a polyolefin molten film susceptible to draw resonance under conditions which would cause draw resonance by extruding the molten film from a die and rapidly cooling said molten film in a rapid cooling zone containing a pressure roll and chilling roll, which comprises contacting said molten film transversely across the surface of said molten film with a gas selected from nitrogen, carbon dioxide, or air at a site substantially midway between said die and the nip of said pressure roll and chilling roll said gas being directed against said molten film at a velocity of about 1 to 150 feet per minute and in an amount sufficient to reduce draw resonance in said molten film. pg,39
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein said gas discharged from a slit-like orifice.
Claim 4
Dependent Claim
21 words
A process according to claim 1 wherein said gas contacts said molten film angularly with respect to the film travel direction.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein said gas contacts said molten film at an angle of about 90° with respect to the film travel direction.
Claim 6
Dependent Claim
20 words
A process according to claim 1 wherein the velocity of said gas is about 10 to 15 feet per minute.
Claim 7
Dependent Claim
28 words
A process according to claim 1 wherein said gas is directed from a source positioned about 1/4 to about 10 inches from the surface of the moving film.
Claim 8
Dependent Claim
28 words
A process according to claim 1 wherein said gas is directed from a source positioned about 1/2 to about 11/2 inches from the surface of the moving film.
Claim 9
Dependent Claim
18 words
A process according to claim 7 wherein said polyolefin film is a linear, low density ethylene hydrocarbon copolymer.
Claim 10
Dependent Claim
103 words
An improvement in an extrusion coating process wherein a polymeric resin is extruded through an extrusion die to form a molten film and wherein said molten film is drawn down, coated onto a substrate and cooled in a rapid cooling zone containing a pressure roll and a chilling roll, the improvement comprising directing a gas selected from nitrogen, carbon dioxide, and air against said molten film between said die and the nip of said pressure roll and chilling roll said gas being directed against said molten film at a velocity and in an amount sufficient to reduce draw resonance in said molten film.
Claim 11
Dependent Claim
103 words
An improvement in an extrusion coating process wherein a polymeric resin is extruded through an extrusion die to form a molten film and wherein said molten film is drawn down, coated onto a substrate and cooled in a rapid cooling zone containing a pressure roll and a chilling roll, the improvement comprising directing a gas selected from nitrogen, carbon dioxide, and air against said molten film between said die and the nip of said pressure roll and chilling roll said gas being directed against said molten film at a velocity and in an amount sufficient to reduce draw resonance in said molten film.
Claim 12
Dependent Claim
11 words
The improvement according to claim 9 wherein said gas is air.
Claim 13
Dependent Claim
21 words
The improvement according to claim 9 wherein said gas contacts said molten film transversely across the surface of said molten film.
Claim 14
Dependent Claim
15 words
The improvement according to claim 9 wherein said gas is discharged from a slit-like orifice.
Claim 15
Dependent Claim
21 words
The improvement according to claim 9 wherein said gas contacts said molten film angularly with respect to the film travel direction.
Claim 16
Dependent Claim
26 words
The improvement according to claim 9 wherein said gas contacts said molten film at an angle of about 90° with respect to the film travel direction.
Claim 17
Dependent Claim
21 words
The improvement according to claim 9 wherein the velocity of said gas is about 1 to about 150 feet per minute.
Claim 18
Dependent Claim
20 words
The improvement according to claim 9 wherein the velocity of said gas is about 10 to 15 feet per minute.
Claim 19
Dependent Claim
28 words
The improvement according to claim 9 wherein said gas is directed from a source positioned about 1/4 to about 10 inches from the surface of the moving film.
Claim 20
Dependent Claim
29 words
The improvement according to claim 9 wherein said gas is directed from a source positioned about 1/2 inch to about 11/2 inches from the surface of the moving film.
Claim 21
Dependent Claim
14 words
The improvement according to claim 9 wherein said polymeric film is a polyolefin film.
Claim 22
Dependent Claim
18 words
The improvement according to claim 9 wherein said polyolefin film is a linear, low density ethylene hydrocarbon copolymer.
Claim 23
Dependent Claim
25 words
The improvement according to claim 9 wnerein said gas contacts moving film at a site substantially midway between said die and said rapid cooling zone.
Claim 24
Dependent Claim
98 words
An improvement in an embossing process wherein a polymeric resin is extruded through an extrusion die to form a molten film and wherein said molten film is drawn down and embossed in a rapid cooling zone containing a pressure roll and a chilling roll, the improvement comprising directing a gas selected from nitrogen, carbon dioxide and air against said molten film between said die and the nip of said pressure roll and chilling roll, said gas being directed against said molten film at a velocity and in an amount sufficient to reduce draw resonance in said molten film.
Claim 25
Dependent Claim
98 words
An improvement in an embossing process wherein a polymeric resin is extruded through an extrusion die to form a molten film and wherein said molten film is drawn down and embossed in a rapid cooling zone containing a pressure roll and a chilling roll, the improvement comprising directing a gas selected from nitrogen, carbon dioxide and air against said molten film between said die and the nip of said pressure roll and chilling roll, said gas being directed against said molten film at a velocity and in an amount sufficient to reduce draw resonance in said molten film.
Claim 26
Dependent Claim
11 words
The improvement according to claim 22 wherein said gas is air.
Claim 27
Dependent Claim
21 words
The improvement according to claim 22 wherein said gas contacts said molten film transversely across the surface of said molten film.
Claim 28
Dependent Claim
15 words
The improvement according to claim 22 wherein said gas is discharged from a slit-like orifice.
Claim 29
Dependent Claim
21 words
The improvement according to claim 22 wherein said gas contacts said molten film angularly with respect to the film travel direction.
Claim 30
Dependent Claim
26 words
The improvement according to claim 22 wherein said gas contacts said molten film at an angle of about 90° with respect to the film travel direction.
Claim 31
Dependent Claim
20 words
The improvement according to claim 22 wherein the velocity of said gas is about 1 to 150 feet per minute.
Claim 32
Dependent Claim
20 words
Tne improvement according to claim 22 wherein the velocity of said gas is about 10 to 15 feet per minute.
Claim 33
Dependent Claim
28 words
The improvement according to claim 22 wherein said gas is directed from a source positioned about 1/4 to about 10 inches from the surface of the moving film.
Claim 34
Dependent Claim
27 words
The improvement according to claim 22 wherein said gas is directed from a source positioned about 1/2 to about 11/2 inches from the surface of moving film.
Claim 35
Dependent Claim
14 words
The improvement according to claim 22 wherein said polymeric film is a polyolefin film.
Claim 36
Dependent Claim
18 words
The improvement according to claim 32 wherein said polyolefin film is a linear, low density ethylene hydrocarbon copolymer.
Claim 37
Dependent Claim
26 words
The improvement according to claim 22 wherein said gas contacts said moving film at a site substantially midway between said die and said rapid cooling zone.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |