US4534829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calender
Assignee: Individual
•
Filing: 1983-01-19
•
Granted: 1985-08-13
•
Expires: 2003-01-19
Abstract
Abstract A supercalender at the output of a paper machine includes two pairs of zone-wise deflection-controlled rollers. Each pair has a hard surface roller and a soft roller with an elastic outer layer or covering having a minimum hardness of 85° Shore D. The hard rollers are disposed on one side and the soft rollers on the other side of the travel path of the paper.
Inventors
- 👤 Karl-Heinz Ahrweiler
- 👤 Helmut Anstotz
- 👤 Werner Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:36
CPC Classifications
D; D21; D21G; D21G1/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
A supercalender for in-line employment at a paper machine, comprising: a first pair of zone-wise deflection-controlled rollers forming a first roller nip; a second pair of zone-wise deflection-controlled rollers forming a second roller nip, said second pair being closely spaced from said first pair along a paper travel path extending from the output of the paper machine; and each of said pairs including a hard roller and a soft roller with an elastic covering having a hardness of at least 85° Shore D, and a thickness of at least fifteen millimeters.
Claim 2
Dependent Claim
91 words
A supercalender for in-line employment at a paper machine, comprising: a first pair of zone-wise deflection-controlled rollers forming a first roller nip; a second pair of zone-wise deflection-controlled rollers forming a second roller nip, said second pair being closely spaced from said first pair along a paper travel path extending from the output of the paper machine; and each of said pairs including a hard roller and a soft roller with an elastic covering having a hardness of at least 85° Shore D, and a thickness of at least fifteen millimeters.
Claim 3
Dependent Claim
22 words
The supercalender defined in claim 1 wherein the hard rollers of said pairs are disposed on the same side of said path.
Claim 4
Dependent Claim
21 words
The supercalender defined in claim 2 wherein said elastic coverings have a hardness in the range 85° to 90° Shore D.
Claim 5
Dependent Claim
13 words
The supercalender defined in 3 wherein said coverings are made of hard rubber.
Claim 6
Dependent Claim
13 words
The supercalender defined in 3 wherein said coverings are made of hard rubber.
Claim 7
Dependent Claim
72 words
In a supercalender for in-line operation with a paper machine the improvement comprising: the supercalender comprising two pairs of zone-wise deflection-controlled rollers, each pair including a hard roller and a soft roller, said soft roller bearing an elastic covering having a hardness of at least 85° Shore D, and a thickness of at least fifteen millimeters, said pairs being spaced from one another along a path of travel of a paper web.
Claim 8
Dependent Claim
72 words
In a supercalender for in-line operation with a paper machine the improvement comprising: the supercalender comprising two pairs of zone-wise deflection-controlled rollers, each pair including a hard roller and a soft roller, said soft roller bearing an elastic covering having a hardness of at least 85° Shore D, and a thickness of at least fifteen millimeters, said pairs being spaced from one another along a path of travel of a paper web.
Claim 9
Dependent Claim
24 words
The improvement defined in claim 5 wherein the rollers of said pairs bearing said covering are disposed on the same side of said path.
Claim 10
Dependent Claim
14 words
The improvement defined in claim 5 wherein said coverings are made of hard rubber.
Claim 11
Dependent Claim
18 words
The improvement defined in claim 5 wherein said coverings have a hardness of 85° to 90° Shore D.
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |