Presses – Methods – With heating or cooling
Patent
1994-12-28
1996-06-11
Gerrity, Stephen F.
Presses
Methods
With heating or cooling
100 93RP, 100161, 162206, B30B 1534, D21G 100
Patent
active
055245323
ABSTRACT:
In the inventive method and apparatus for calendering a surface of a paper or board web, a temperature difference is created between the web surfaces so that the surface to be calendered is cooler than the opposite surface. In addition, moisture within the web is transferred using the so-called heat pipe effect toward the cooler surface while substantially preventing evaporation of moisture from the web so as to create a predetermined moisture profile transversely through the web and decrease the glass transition temperature of the web at the relatively cooler surface to be calendered. Finally, the web having the predetermined moisture profile is advanced into the calendering nip so that the relatively cooler and moister surface of the web is pressed against the heated roll of the nip to thereby calender that web surface.
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patent: 2251890 (1941-08-01), Montgomery
patent: 4606264 (1986-08-01), Agronin et al.
patent: 4653395 (1987-03-01), Verkasalo
patent: 4738197 (1988-04-01), Malkia
patent: 4932139 (1990-06-01), Lehtinen
patent: 5033373 (1991-07-01), Brendel et al.
patent: 5378497 (1995-01-01), Johnson et al.
Lehtinen, Jukka "The heat pipe process in intraweb heat transfer in hot-surface paper drying", Paper and Timber vol. 74/No. 7/1992.
Lehtinen, Jukka A. "Some structural effects on the diffusional and fluid flow frictional resistance of paper webs undergoing hot-surface drying", no date.
Lehtinen, Jukka "Further development of a computer program simulating heat pipe functioning in condebelt paper drying", Drying Technology, 10(4), 1037-1062 (1992).
Ellila Markku
Koivukunnas Pekka
Gerrity Stephen F.
Valmet Corporation
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