Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Reexamination Certificate
1998-12-18
2001-03-20
Walberg, Teresa (Department: 3742)
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
C219S216000, C399S330000, C118S060000
Reexamination Certificate
active
06204487
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. DE 197 57 474.2, filed Dec. 23, 1997, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to paper calenders, and more specifically to paper calenders with at least two rolls, one of which having an elastic cover made of plastic and one of which that may be heated by means of a heating device.
2. Discussion of Background Information
Currently, calenders exist that have one or a number of nips, which are defined on the one side, by means of a cast iron roll that can be heated and conducts heat well, and are defined on the other side by means of a roll that has an elastic cover. With the aid of the heating device, a part of the deforming energy is supplied as heat so that in many instances the mechanical deforming energy, which acts as a compressive strain in the nip, can be reduced. In addition, the heat cooperates with the smooth surface of the cast iron roll in such a way that the surface of the paper web is improved with regard to its properties such as brilliance, smoothness, or the like.
German patent DE 27 48 123 A1 discloses dissipating the undesirable heat, which is produced in an elastic cover by means of a flexing work, in such a way that fine metal particles are embedded in the plastic in order to improve the heat conductivity.
German patent DE 195 06 301 A1 discloses a two roll paper calender both one roll supports an elastic cover and the other roll is heated.
SUMMARY OF THE INVENTION
The present invention is directed to a method and device for a paper calender that substantially obviates one or more of the problems arising from the limitations and disadvantages of the related art.
It is an object of the present invention to provide a paper calender with at least two rolls, one of which has an elastic cover and one of which that may be heated, which permits novel combinations in the calender rolls.
Accordingly, one aspect of the present invention is directed to a paper calender that includes at least one first roll, an elastic cover made of plastic; and at least one heatable roll. The at least one heatable roll is heatable by means of a heating device. The at least one heatable roll supports the elastic cover.
According to another aspect of the present invention, the heating device heats the elastic cover from the inside, and the elastic cover contains dispersions of highly heat conductive material.
According to yet another aspect of the present invention, the heating device heats the elastic cover from the inside, and the elastic cover has a thickness of about 0.05 to 2 mm.
According to a further aspect of the present invention, the elastic cover has a thickness of about 0.1 to 1 mm.
According to another aspect of the present invention, the paper calender has a roll body that supports the elastic cover, and the roll body has peripherally extending heating medium conduits.
According to yet another aspect of the present invention, the heating medium is steam.
According to a further aspect of the present invention, the highly heat conductive material is made of metal.
According to another aspect of the present invention, the highly heat conductive material is made of carbon.
According to yet another aspect of the present invention, the dispersions have a component in the radial direction.
According to a further aspect of the present invention, the elastic cover contains dispersions of dark material, and the elastic cover is heated from the outside by means of IR radiation.
According to another aspect of the present invention, the dispersions of dark material contain paint pigments.
According to yet another aspect of the present invention, the elastic cover contains dispersions of material that can be magnetized, and the elastic cover is heated from the outside by means of an induction coil.
According to a further aspect of the present invention, the at least one heatable roll supporting the elastic cover forms a nip together with a second heatable roll.
According to another aspect of the present invention, the heating device containing an induction coil.
According to yet another aspect of the present invention, there is only a single nip.
According to a further aspect of the present invention, the elastic cover has an inner layer made of a first plastic and an outer layer made of a second plastic, the outer layer has a lesser elasticity and a greater hardness than the first plastic, as well as a smooth surface.
According to another aspect of the present invention, the inner layer made of a first plastic has dispersions of highly heat conductive material.
According to yet another aspect of the present invention, the at least one heatable roll supporting the elastic cover forms a nip with a deflection adjustment roll.
According to a further aspect of the present invention, the deflection adjustment roll has a roll jacket made of cast iron.
According to another aspect of the present invention, the deflection adjustment roll is pressed against the at least one heatable roll by support elements controlled in zones.
According to yet another aspect of the present invention, the plastic is polyester, epoxy, or phenol resins.
According to a further aspect of the present invention, the plastic is fiber-reinforced with fibers with high heat conductivity.
According to another aspect of the present invention, the fibers have high heat conductivity carbon fibers.
According to yet another aspect of the present invention, the invention is directed to a method for smoothing paper that includes supporting a plastic cover on a first roll, heating the first roll, pressing a second roll against the first roll forming a nip between the first roll and the second roll, and passing a paper web through the nip, the paper web is simultaneously heated and smoothed while passing through the nip.
According to a further aspect of the present invention, the heating includes heating by steam.
According to yet another aspect of the present invention, the heating includes heating by IR radiation.
According to a further aspect of the present invention, the invention includes heating from a heating source internal to the first roll, the heating source heating the inside of the plastic cover.
According to another aspect of the present invention, the invention includes heating dispersions of highly heat conductive material inside the plastic cover.
According to yet another aspect of the present invention, the invention includes heating from a heating source external to said first roll, the heating source heating the outside of the plastic cover.
According to a further aspect of the present invention, the invention includes heating dispersions of magnetizable material inside the plastic cover.
According to another aspect of the present invention, the invention includes heating the second roll.
According to yet another aspect of the present invention, the underside of the paper web is smoothed by a simultaneous supply of heat from above, and the top side of the paper web is smoothed by a simultaneous supply of heat from below.
According to a further aspect of the present invention, the invention includes controlling the pressing of a second roll against the first roll by support elements controlled in zones.
Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawings.
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Fuqua Shawntina
Greenblum & Bernstein P.L.C.
Voith Sulzer Papiertechnik Patent GmbH
Walberg Teresa
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