US3575134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opposed blade coater
Assignee: Oxford Paper Co
•
Filing: 1968-02-08
•
Granted: 1971-04-13
•
Expires: 1988-02-08
Abstract
Abstract An opposed blade coating system for simultaneously coating the opposite sides of a paper web, the system including an applicator for applying coating material to the opposite sides of the web, a flexible blade unit comprised of a pair of blades having flat beveled working surfaces engaging opposite sides of the coated web in opposed relationship with each other for metering the layer of coating on the opposite sides of the web, and drying mechanism for thereafter drying the coated web.
Inventors
- 👤 Richard J Quint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/08; D21H25/10; D21H5/00; D21H5/0005; D21H5/006; D21H5/0062; D21H5/0065
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
In a paper web coating apparatus having means for directing the web along a predetermined path, means for applying a layer of coating material to both sides of said web as it moves along said predetermined path, and metering means for metering the layers of coating on said web as it progresses upwardly through a metering station located along a vertical portion of said predetermined path, the improvement wherein said metering means comprises: a. a pair of elongated opposed flexIble blades located on opposite sides of said web in said metering station, each of said blades having a base portion and a flat beveled working surface along one elongated edge thereof facing one side of said web; b. clamping means for clamping said blades at the base portion thereof and at a location spaced from said working surface with said blades extending upwardly at an acute angle relative to the path of movement of said web through said metering station and with the working surfaces thereof in horizontally opposed relationship; and c. means for urging said blades in a horizontal direction toward each other with a force sufficient to establish at least a partially flush engagement of said working surfaces with the opposite sides of the coated web.
Claim 2
Dependent Claim
91 words
The improvement in the web coating apparatus as set forth in claim 2 further including: a. slidable carriages for supporting said blade clamping means, said carriages being mounted for movement relative to each other along a horizontal path to move said blades horizontally toward each other; b. adjusting means for adjusting the angle of extension of said blades; and c. selectively operable control means for positioning said carriages in adjusted locations along said horizontal path with said blades engaging the opposite sides of the coated web under selected amounts of pressure.
Claim 3
Dependent Claim
50 words
The improvement in the web coating apparatus as set forth in claim 2 wherein: a. the angle of bevel of the working surface of each blade is less than the acute angle of extension of said blades relative to the path of movement of the web through said metering station.
Claim 4
Dependent Claim
45 words
The improvement in the web coating apparatus as set forth in claim 4 wherein: a. the angle of bevel of the working surface of each blade is between about 30*-50*; and b. the angle of extension of said blades is between about 35* and 55*.
Claim 5
Dependent Claim
34 words
The improvement in the web coating apparatus as set forth in claim 5 wherein: a. blades are constructed of plastic material having a P & J plastometer value of between about 4 and 27.
Claim 6
Dependent Claim
30 words
The improvement in the web coating apparatus as set forth in claim 6 wherein: a. said blades are constructed of polyurethane having a durometer hardness of about 95 Shore A.
Claim 7
Dependent Claim
37 words
The improvement in the web coating apparatus as set forth in claim 7 wherein: a. the thickness of said blades is between about 1/4 - 1/3 the length of extension of said blades from said clamping means.
Claim 8
Dependent Claim
55 words
The improvement in the web coating apparatus as set forth in claim 8 wherein: a. the angle of bevel of the working surfaces of each blade is about 40*; b. the angle of extension of each blade is about 55*; and c. the blades each have a P & J plastometer value of about 20.
Claim 9
Dependent Claim
53 words
The improvement in the web coating apparatus as set forth in claim 9 wherein: a. each of said blades is tapered back at the leading edge of said working surface at an angle to form a back surface of an area equal to a small fraction of the area of said working surface.
Claim 10
Dependent Claim
91 words
The improvement in the web coating apparatus as set forth in claim 10 further including: a. slidable carriages for supporting said blade clamping means, said carriages being mounted for movement relative to each other along a horizontal path to move said blades horizontally toward each other; b. adjusting means for adjusting the angle of extension of said blades; and c. selectively operable control means for positioning said carriages in adjusted locations along said horizontal path with said blades engaging the opposite sides of the coated web under selected amounts of pressure.
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |