US5803976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum web coating
Assignee: Imperial Chemical Industries Ltd
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Filing: 1994-11-23
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Granted: 1998-09-08
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Expires: 2014-11-23
Abstract
Abstract In an apparatus for vacuum web coating, an evaporation means has a plurality of separately spaced outlet nozzles through which vapour is conveyed to a deposition zone at the surface of a chilled rotatable drum in a vacuum chamber over which drum the substrate web is advanced by a web transport system. The outlet nozzle arrangement advantageously comprises a plurality of linear slots disposed transversely to the web substrate path to deliver vapour at positions disposed sequentially in the direction of the web substrate advance, the nozzle outlets being disposed on an arcuate surface around, but spaced from, the curved surface of the rotatable drum. The apparatus is particularly suitable for applying thick coatings of material such as metal on paper or plastic films.
Inventors
- 👤 Ian Kenneth Baxter
- 👤 Charles Arthur Bishop
- 👤 David Charles McGee
- 👤 Keith Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:23
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/22; C23C14/56; C23C14/562; C23C14/24; C23C14/243
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
178 words
Apparatus for vacuum web coating comprising a vacuum chamber containing at least one rotatable cooling drum providing at a curved surface thereof at least one deposition zone; a web transport system for advancing a web substrate to be coated over said curved surface along a path through said deposition zone; and evaporation means for vaporizing coating material to be deposited on said web; said evaporation means providing a plurality of separately spaced outlet nozzles operatively disposed to convey a vapour from said evaporation means to portions of said deposition zone along said web path, at which portions said vapour is in operation condensed on the surface of the advancing web, said evaporation means further comprising at least two sealed retorts having a common heating means adapted to vaporize coating material in said retorts, and at least one of said plurality of nozzles connected to each of said at least two retorts; and a single or plurality of outlet ends of said nozzles being disposed on an arcuate surface around but spaced from the curved surface of the drum.
Claim 2
Dependent Claim
178 words
Apparatus for vacuum web coating comprising a vacuum chamber containing at least one rotatable cooling drum providing at a curved surface thereof at least one deposition zone; a web transport system for advancing a web substrate to be coated over said curved surface along a path through said deposition zone; and evaporation means for vaporizing coating material to be deposited on said web; said evaporation means providing a plurality of separately spaced outlet nozzles operatively disposed to convey a vapour from said evaporation means to portions of said deposition zone along said web path, at which portions said vapour is in operation condensed on the surface of the advancing web, said evaporation means further comprising at least two sealed retorts having a common heating means adapted to vaporize coating material in said retorts, and at least one of said plurality of nozzles connected to each of said at least two retorts; and a single or plurality of outlet ends of said nozzles being disposed on an arcuate surface around but spaced from the curved surface of the drum.
Claim 3
Dependent Claim
24 words
Apparatus as claimed in claim 1 wherein at least one retort has a sealed removable lid wherein at least one outlet nozzle is located.
Claim 4
Dependent Claim
26 words
Apparatus as claimed in claim 1 wherein the outlet nozzles comprise at least one continuous slot extending over the width of the web to be coated.
Claim 5
Dependent Claim
42 words
Apparatus as claimed in claim 3 wherein the outlet nozzles comprise a plurality of linear slots disposed transversely to the web substrate path to deliver vapour to portions of the deposition zone disposed sequentially in the direction of the web substrate advance.
Claim 6
Dependent Claim
26 words
Apparatus as claimed in claim 1 wherein the nozzles vary in profile, the upstream nozzles being adapted to provide a lower deposition rate than downstream nozzles.
Claim 7
Dependent Claim
47 words
Apparatus as claimed in claim 1 wherein the nozzle profiles are adapted to provide an approximately equal flow of vapour and the curved surface of the drum and the arcuate surface at which the nozzle ends are located are convergent in the direction of the web advance.
Claim 8
Dependent Claim
35 words
Apparatus as claimed in claim 1 wherein the nozzles are adapted to provide equal vapour flow and are disposed in sequence along the web path at decreased spacing in the direction of the web advance.
Claim 9
Dependent Claim
113 words
Apparatus for vacuum web coating comprising: 1) a vacuum chamber containing at least one rotatable cooling drum having a curved surface; 2) at least one deposition zone along said curved surface; 3) a web transport system for advancing a web substrate to be coated over said curved surface along a path through said deposition zone; wherein said deposition zone includes: a) evaporation means for vaporizing coating material to be deposited on said web; b) a plurality of vapour outlet nozzles connected to said evaporation means disposed along said curved surface in the direction of the advancing web, and spaced therefrom, for providing a plurality of distinct deposition areas along the web transport direction.
Claim 10
Dependent Claim
113 words
Apparatus for vacuum web coating comprising: 1) a vacuum chamber containing at least one rotatable cooling drum having a curved surface; 2) at least one deposition zone along said curved surface; 3) a web transport system for advancing a web substrate to be coated over said curved surface along a path through said deposition zone; wherein said deposition zone includes: a) evaporation means for vaporizing coating material to be deposited on said web; b) a plurality of vapour outlet nozzles connected to said evaporation means disposed along said curved surface in the direction of the advancing web, and spaced therefrom, for providing a plurality of distinct deposition areas along the web transport direction.
Claim 11
Dependent Claim
33 words
The apparatus according to claim 8 wherein the evaporation means comprises at least one sealed retort wherein coating material can be vaporized, each retort having at least one vapour outlet nozzle connected thereto.
Claim 12
Dependent Claim
25 words
The apparatus according to claim 9 wherein at least one retort has a sealed removable lid and the outlet nozzle is connected to said lid.
Claim 13
Dependent Claim
25 words
The apparatus according to claim 8 wherein at least one outlet nozzle extends transverse to the web transport direction the full width of the web.
Claim 14
Dependent Claim
39 words
The apparatus according to claim 8 wherein the plurality of vapour outlet nozzles comprises a plurality of linear slots disposed transversally to the web path to deliver vapour to portions of the web disposed sequentially along the web path.
Claim 15
Dependent Claim
26 words
The apparatus according to claim 8 wherein the plurality of nozzles vary in profile, upstream nozzles being adapted to provide lower deposition rates than downstream nozzles.
Claim 16
Dependent Claim
40 words
The apparatus according to claim 8 wherein the plurality of nozzles are arranged along an arcuate path convergent with the web path in the direction of the web transport, and have profiles adapted to provide approximately equal flow of vapour.
Claim 17
Dependent Claim
38 words
The apparatus according to claim 8 wherein the plurality of nozzles are arranged in a sequence along the web path at progressively decreasing distance from the web, and have profiles adapted to provide approximately equal flow of vapour.
References Cited (Backward Citations)
US2709663A
Cited
US3081201A
Cited
US3190262A
Cited
US3511212A
Cited
US3683847A
Cited
US3924563A
Cited
US4321299A
Cited
US4842893A
Cited
US5097800A
Cited
US4682565A
Cited
US4864967A
Cited
US5123376A
Cited
JPH04371567A
Cited
US5224441A
Cited
US5302208A
Cited
EP0652302A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-07 | 2002-03-09 | 2002-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-07 | 2006-03-09 | 2006-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-07 | 2010-03-09 | 2010-09-08 | $7700.00 | Window Closed / Lapsed |