US3956790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of apparatus for removing dust from the surface of a moving web
Assignee: Fujifilm Holdings Corp
•
Filing: 1974-07-23
•
Granted: 1976-05-18
•
Expires: 1994-07-23
Abstract
Abstract Dust is removed from a running web by a counterflow liquid bath and downstream application of one or more high velocity air jets to a localized convex curvature of the web, said application of high velocity air jets being accompanied by application of vacuum pressure to remove the mist created by the air jets.
Inventors
- 👤 Mamoru Ishiwata
- 👤 Katzutaka Yoshida
- 👤 Hiroshi Nozawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:51
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/74; G03C2001/7429
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
Apparatus for removing dust from a moving web, said apparatus comprising: a. a fountain washer having a discharge slot defined by two lips, the upstream lip being spaced further from the moving web during use of the apparatus than the downstream lip, whereby the overflowing liquid flows in the direction opposite to the running direction of the web during use of the apparatus, and b. a liquid removing means downstream of said fountain washer, said liquid removing means comprising: i. means for giving the moving web a localized curvature; ii. means for blowing compressed air against the outer surface of the curved moving web at an angle to the surface the absolute value of which is between 0° and 30°, thereby creating a mist of the washing liquid, and iii. means for exhausting the mist and the blown air from the vicinity of the moving web.
Claim 2
Dependent Claim
146 words
Apparatus for removing dust from a moving web, said apparatus comprising: a. a fountain washer having a discharge slot defined by two lips, the upstream lip being spaced further from the moving web during use of the apparatus than the downstream lip, whereby the overflowing liquid flows in the direction opposite to the running direction of the web during use of the apparatus, and b. a liquid removing means downstream of said fountain washer, said liquid removing means comprising: i. means for giving the moving web a localized curvature; ii. means for blowing compressed air against the outer surface of the curved moving web at an angle to the surface the absolute value of which is between 0° and 30°, thereby creating a mist of the washing liquid, and iii. means for exhausting the mist and the blown air from the vicinity of the moving web.
Claim 3
Dependent Claim
46 words
Apparatus as recited in claim 1 wherein said means for blowing delivers air to the moving web at a speed of not less than 250 meters per second and said means for exhausting water and air pressure of not higher than 400 mm H 2 O.
Claim 4
Dependent Claim
15 words
Apparatus as recited in claim 1 and further comprising means for recirculating the washing liquid.
Claim 5
Dependent Claim
54 words
Apparatus as recited in claim 1 wherein said means for blowing comprise two air jets, one directed at the outer surface of the curved moving web at an angle of between 0° and 30° and the other directed at the outer surface of the curved web at an angle of between 150° and 180°.
Claim 6
Dependent Claim
39 words
Apparatus as recited in claim 4 wherein said air jets and said means for exhausting are all contained in a common chamber, part of the boundary of which is defined by the outer surface of the curved moving web.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |