US3853447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for quenching polymer films
Assignee: EIDP Inc
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Filing: 1973-03-02
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Granted: 1974-12-10
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Expires: 1993-03-02
Abstract
Abstract A quenching apparatus comprising an extrusion die; a casting drum; a trough for a liquid coolant into which the casting drum is partially immersed; a stripping roller; and a chilling roll, partially immersed in the liquid coolant, to compress the cast film onto the drum and chill the surface of the film to form a temporary hard skin on the exposed surface of this film just prior to immersion in the liquid bath. Air-knives may be provided for removing liquid from the surface of the chilling roll and the cast film.
Inventors
- 👤 N Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:40
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/22; B29C43/24; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/915; B29C48/9155; B29C48/917
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
In an apparatus for quenching a film of liquefied organic polymer to form a solid film of the type comprising: a movable casting surface; means for casting a film of molten polymer onto said casting surface; a trough for a liquid coolant into which the lower segment of said casting surface and the film attached to it is immersed; and means for removing the film from said casting surface; the improvement wherein said apparatus further comprises a chilling roll adjacent to said casting surface, disposed relative to said trough so that it is immersed in the cooling liquid to a depth not exceeding its radius, means adjacent to said chilling roll to dry the the surface of said chilling roll before it contacts the film, said chilling roll being further adapted to press the film against said casting surface, at a point just prior to the point where the film enters the liquid coolant, to momentarily harden the exposed surface of the film and form a hardened skin which will resist deformation due to the quenching process.
Claim 2
Dependent Claim
177 words
In an apparatus for quenching a film of liquefied organic polymer to form a solid film of the type comprising: a movable casting surface; means for casting a film of molten polymer onto said casting surface; a trough for a liquid coolant into which the lower segment of said casting surface and the film attached to it is immersed; and means for removing the film from said casting surface; the improvement wherein said apparatus further comprises a chilling roll adjacent to said casting surface, disposed relative to said trough so that it is immersed in the cooling liquid to a depth not exceeding its radius, means adjacent to said chilling roll to dry the the surface of said chilling roll before it contacts the film, said chilling roll being further adapted to press the film against said casting surface, at a point just prior to the point where the film enters the liquid coolant, to momentarily harden the exposed surface of the film and form a hardened skin which will resist deformation due to the quenching process.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 further comprising a plurality of spaced jet orifices disposed within said trough beneath said casting surface for projection stresses of coolant liquid against the surface of the film while it is immersed in the coolant liquid.
Claim 4
Dependent Claim
31 words
The apparatus of claim 1 further comprising plenum chambers spaced around the periphery of the casting surface for directing a current of gaseous coolant onto the exposed surface of the film.
Claim 5
Dependent Claim
13 words
An apparatus according to claim 2 wherein the jet orifices are narrow slots.
Claim 6
Dependent Claim
17 words
An apParatus according to claim 2 having means for recirculating liquid coolant to and from the trough.
Claim 7
Dependent Claim
42 words
An apparatus according to claim 2 wherein said means to dry the surface of said chilling roll comprises an air-knife adjacent the chilling roll for removing liquid coolant therefrom and an air-knife for removing liquid coolant from the surface of the film.
References Cited (Backward Citations)
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Cited
US3175026A
Cited
US3085292A
Cited
US3042968A
Cited
US3619454A
Cited
US3597515A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |