US3702912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for calendering strip-like material
Assignee: Wean United Inc
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Filing: 1971-02-04
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Granted: 1972-11-14
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Expires: 1991-02-04
Abstract
Abstract The disclosure of this invention relates to a method and apparatus for processing strip-like material, such as paper and synthetics. It includes a multi-roll calender in which the material is passed around the rolls in a serpentine manner so that the rolls have material-contacting portions and nonmaterialcontacting portions. External induction heating is applied to the material-contacting portions of the rolls to heat the rolls immediately under the material. The temperature of the rolls are measured by sensors at the noncontacting portions of the rolls.
Inventors
- 👤 Joseph Irwin Greenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
D; D21; D21G; D21G1/00; D21G1/02; D21G1/0253; D21G1/028
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A method of calendering strip-like material comprising the steps of: passing the material around different portions of at least two cooperating rotating calender rolls, applying heat by induction externally to the entire portion of each roll around which the material comes into contact to heat only the outer periphery of the rolls through the material, measuring the temperature of said rolls on the nonmaterialcontacting portions thereof, and varying the applied heat until a measured temperature equals a desired temperature.
Claim 2
Independent Claim
79 words
A method of calendering strip-like material comprising the steps of: passing the material around different portions of at least two cooperating rotating calender rolls, applying heat by induction externally to the entire portion of each roll around which the material comes into contact to heat only the outer periphery of the rolls through the material, measuring the temperature of said rolls on the nonmaterialcontacting portions thereof, and varying the applied heat until a measured temperature equals a desired temperature.
Claim 3
Dependent Claim
38 words
A method according to claim 1 in which said step for applying heat includes applying said heat along the entire lengths of said rolls and controlling the applied heat to heat said rolls only immediately under the material.
Claim 4
Dependent Claim
17 words
A method according to claim 1 in which said rolls are made up of iron or steel.
Claim 5
Dependent Claim
51 words
A method according to claim 1 including the additional step of selecting the cycle of the induction heating with reference to the dielectric nature of the material such that the applied heat will not be induced into the material and the material will extract its heat substantially entirely from the rolls.
Claim 6
Dependent Claim
23 words
A method according to claim 1 including the step of only applying heat to the portions inward of the edge of the material.
Claim 7
Dependent Claim
103 words
A calender or like device comprising: at least two cooperating rotating rolls around which material to be processed passes in a manner that the rolls have different material-contacting portions and different nonmaterial-contacting portions, induction heating means for at least one roll arranged to externally heat the entire material-contacting portion thereof in a manner to heat only the outer periphery of said one roll, temperature measuring means for said one roll arranged to measure the temperature of the nonmaterial-contacting portion of said one roll, and means for varying the heat output of said induction heating means until the measured temperature equals a desired temperature.
Claim 8
Dependent Claim
103 words
A calender or like device comprising: at least two cooperating rotating rolls around which material to be processed passes in a manner that the rolls have different material-contacting portions and different nonmaterial-contacting portions, induction heating means for at least one roll arranged to externally heat the entire material-contacting portion thereof in a manner to heat only the outer periphery of said one roll, temperature measuring means for said one roll arranged to measure the temperature of the nonmaterial-contacting portion of said one roll, and means for varying the heat output of said induction heating means until the measured temperature equals a desired temperature.
Claim 9
Dependent Claim
30 words
A calender or like device according to claim 6 in which said heating means includes means for heating the entire length of the material contacting portion of said one roll.
Claim 10
Dependent Claim
20 words
A calender or like device according to claim 6 in which said calender rolls are formed of iron or steel.
Claim 11
Dependent Claim
41 words
A calender or like device according to claim 6 including heat shields arranged at the opposite end of said one roll between said induction heating means and said material-contacting portion thereof, And means for adjusting said shields axially of said roll.
Claim 12
Dependent Claim
78 words
A calender or like device according to claim 6 in which said calender comprises several small diameter rolls arranged in a common vertical plane, backup rolls arranged in said vertical plane for supporting the two opposite outer small diameter rolls, at least two of said small diameter rolls having said material-contacting and nonmaterial-contacting portions, one of said induction heating means for each of said two rolls, one of said temperature measuring means for each of said two rolls.
Claim 13
Dependent Claim
46 words
A calender or like device according to claim 6 including support means for said induction heating means, and means for maintaining said heating means close to said material-contacting portion of said one roll with a controllable air gap between said heating means and said one roll.
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) | 1975-11-14 | 1976-05-15 | 1976-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-14 | 1980-05-15 | 1980-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-14 | 1984-05-15 | 1984-11-14 | $7700.00 | Window Closed / Lapsed |