US3908808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic calendering of paper webs
Assignee: Nakajima All Co Ltd
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Filing: 1973-09-17
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Granted: 1975-09-30
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Expires: 1993-09-17
Abstract
Abstract More rapid and improved calendering of a paper web is achieved by vibrating at ultrasonic frequency at least one of the calendering rolls at a nip through which the web runs. Accelerated attainment of gloss of the finished sheet through friction or shear stress, and smoothness of the finish sheet by pressure or compressive stress are provided for.
Inventors
- 👤 Leroy H Busker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:51
CPC Classifications
D; D21; D21G; D21G1/00; B; B30; B30B; B30B3/00; B30B3/005; B30B3/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
41 words
A method of calendering paper web, comprising: running the paper web through the nip of a pair of cooperatively rotating calender rolls; and vibrating peripherally at ultrasonic frequency at least one of said rolls as the web runs through said nip.
Claim 2
Independent Claim
41 words
A method of calendering paper web, comprising: running the paper web through the nip of a pair of cooperatively rotating calender rolls; and vibrating peripherally at ultrasonic frequency at least one of said rolls as the web runs through said nip.
Claim 3
Dependent Claim
18 words
A method according to claim 1, comprising ultrasonically vibrating both of said rolls in different modes of vibration.
Claim 4
Dependent Claim
21 words
A method according to claim 1, comprising vibrating said one roll radially and peripherally vibrating the other roll at ultrasonic frequency.
Claim 5
Dependent Claim
23 words
A method according to claim 1, comprising vibrating said one roll radially and vibrating the other of said rolls at ultrasonic frequency longitudinally.
Claim 6
Dependent Claim
43 words
Apparatus for calendering paper web, comprising: a pair of cooperatively rotatable calendering rolls providing a nip through which the paper web runs; and means for vibrating peripherally at ultrasonic frequency at least one of said rolls as the web runs through said nip.
Claim 7
Dependent Claim
43 words
Apparatus for calendering paper web, comprising: a pair of cooperatively rotatable calendering rolls providing a nip through which the paper web runs; and means for vibrating peripherally at ultrasonic frequency at least one of said rolls as the web runs through said nip.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 5, comprising means for ultrasonically vibrating both of said rolls in different modes of vibration.
Claim 9
Dependent Claim
24 words
Apparatus according to claim 5, comprising means for vibrating said one roll radially and means for peripherally vibrating the other roll at ultrasonic frequency.
Claim 10
Dependent Claim
26 words
Apparatus according to claim 5, comprising means for vibrating said one roll radially and means for longitudinally vibrating the other of said rolls at ultrasonic frequency.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |