US4698914A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Setting/drying process for flexible web coating
Assignee: Agfa Gevaert NV
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Filing: 1986-05-29
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Granted: 1987-10-13
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Expires: 2006-05-29
Abstract
Abstract A process for preparing a defect-free dry coated flexible web, e.g., plastic film, paper, comprising transporting a web freshly coated on one side, in floating and substantially flutter-free condition through a setting/drying zone having a series of sections each section having at least one push-type and one draw-type gas discharge device, e.g., air bar and air foil, respectively, impinging the web on the side opposite to the freshly coated side at an angle, respectively, of substantially 90° and 0.5° to 5° relative to the transport direction of the moving web whereby a wave form, e.g., a single wave form such as a sinusoidal wave, having a repeating cycle of about 10 to 60 inches (25.4 to 152.4 cm) is produced in the web. The set web coating can be subsequently dried in a web drying zone, if required. The defect-free film is useful as an x-ray film, industrial testing film, graphic arts film, photosensitive element, plastic coated film or paper.
Inventors
- 👤 Ming-tsai Shu
- 👤 William R. Thomas, Jr.
- 👤 Ann M. Wehner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:36
CPC Classifications
F; F26; F26B; F26B13/00; F26B13/10; F26B13/101; F26B13/104
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
155 words
A process for preparing a dry and defect-free coated flexible web, including the steps of setting/drying a moving freshly coated web comprising transporting the web freshly coated on one side thereof in floating or contact-free and substantially flutter-free condition through a setting/drying zone having a series of sections, each section having at least one push-type gas discharge device and at least one draw-type gas discharge device, the gas discharge from the push-type device impinging the side of the web opposite to the fresh coating at an angle of substantially 90 degrees relative to the transport direction of the moving web and the gas discharge from the draw-type device impinging the side of the web opposite to the fresh coating at about 0.5 to 5.0 degrees substantially exclusively relative to the transport direction of the moving web whereby a stable wave form having cycle lengths of about 10 to 60 inches is produced in said web.
Claim 2
Dependent Claim
155 words
A process for preparing a dry and defect-free coated flexible web, including the steps of setting/drying a moving freshly coated web comprising transporting the web freshly coated on one side thereof in floating or contact-free and substantially flutter-free condition through a setting/drying zone having a series of sections, each section having at least one push-type gas discharge device and at least one draw-type gas discharge device, the gas discharge from the push-type device impinging the side of the web opposite to the fresh coating at an angle of substantially 90 degrees relative to the transport direction of the moving web and the gas discharge from the draw-type device impinging the side of the web opposite to the fresh coating at about 0.5 to 5.0 degrees substantially exclusively relative to the transport direction of the moving web whereby a stable wave form having cycle lengths of about 10 to 60 inches is produced in said web.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein the set web is transported and dried completely in a web drying zone.
Claim 4
Dependent Claim
48 words
A process according to claim 2 wherein the steps of coating and setting/drying are repeated with a fresh coating being applied to the opposite side of the web and the gas discharge from the push-type and draw-type devices impinging the previously coated/set or coated/set/dried surface of the web.
Claim 5
Dependent Claim
16 words
A process according to claim 1 wherein the coating is at least one silver halide emulsion.
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein the coating is at least one colloid coating.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein the coating is at least one polymer coating.
Claim 8
Dependent Claim
13 words
A process according to claim 1 wherein the web is a plastic film.
Claim 9
Dependent Claim
11 words
A process according to claim 8 wherein the web is paper.
Claim 10
Dependent Claim
19 words
A process according to claim 1 wherein the tension on the moving web is up to 10 pounds/lineal inch.
Claim 11
Dependent Claim
19 words
A process according to claim 1 wherein the tension on the moving web is greater than 0.5 pound/lineal inch.
Claim 12
Dependent Claim
15 words
A process according to claim 4 wherein the setting is accomplished with impinging cool gas.
Claim 13
Dependent Claim
15 words
A process according to claim 5 wherein the setting is accomplished with impinging cool gas.
Claim 14
Dependent Claim
17 words
A process according to claim 6 wherein the setting is accomplished with impinging cool or warm gas.
Claim 15
Dependent Claim
25 words
A process according to claim 1 wherein each section of the setting zone contains one push-type and one draw-type gas discharge device, in either order.
Claim 16
Dependent Claim
20 words
A process according to claim 13 wherein the push-type gas discharge device is followed by the draw-type gas discharge device.
Claim 17
Dependent Claim
29 words
A process according to claim 1 wherein each section of the setting zone contains a series of draw-type gas discharge devices followed by a single push-type gas discharge device.
Claim 18
Dependent Claim
42 words
A process according to claim 1 wherein the gas discharge from the draw-type device impinges the side of the web opposite to the fresh coating at an angle of 1 to 3 degrees relative to the transport direction of the moving web.
Claim 19
Dependent Claim
47 words
A process according to claim 1 wherein the gas velocity in the draw-type gas discharge device ranges from 2,000-14,000 feet/minute and the gas velocity in the push-type gas discharge device ranges from 1,800 to 14,000 feet/minute, the air velocities being balanced to yield a stable wave form.
Claim 20
Dependent Claim
27 words
A process according to claim 1 wherein the minimum distance of the bottom of the web to the top of a gas discharge device is 0.0625 inch.
Claim 21
Dependent Claim
25 words
A process according to claim 1 wherein the wave form is a single wave form which is repeated in each section of the setting/drying zone.
Claim 22
Dependent Claim
29 words
A process according to claim 19 wherein the single wave form is a sinusoidal path generated by the gas discharge pressure of the draw-type and push-type gas discharge devices.
Claim 23
Dependent Claim
41 words
A process according to claim 1 wherein the setting/drying zone above the freshly coated side of the web air is discharged substantially parallel relative to the transport direction of the moving web to remove solvent and/or volatiles evaporated from the coating.
References Cited (Backward Citations)
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US3065098A
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US3559301A
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |