Heating roller

Details Heating roller Heating roller

1999-09-20

2001-02-20

Walberg, Teresa (Department: 3742)

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

C492S050000, C492S051000, C492S052000

Reexamination Certificate

active

06191395

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a roller for heat-treating film, cloth, paper and the like.
2. Description of the Prior Art
Conventional heating rollers such as a calendar roller, a laminating roller, a fixing roller and the like utilize a heater embedded inside a metallic pipe in order to heat the cuter pipe indirectly. However, the conventional method had a drawback in that the surface temperature of the outer pipe tended to be uneven, which was not suitable for heat-treating film and the like.
Therefore, in order to improve the uniformity of the heat distribution on the surface of the roller, a method such as circulating a heat medium (liquid and the like ) inside the pie, or a method combining the heat circulation method and an induction heating method is performed. However, the ancillary devices for performing these methods were complex, the weight of the pipe was increased, and the heating roller as a whole including the driving system became very expensive.
SUMMARY OF THE INVENTION
Therefore, the present invention aims at providing an inexpensive and light-weight heating roller with a uniform surface temperature.
The heating roller according to the present invention comprises, as a basic structure, a surface layer formed of a prepreg material including carbon fiber having a high tensile strength and a high elastic modulus, and a heating unit mounted in the interior of said surface layer and communicated to a power supply unit formed of a prepreg material including carbon fiber having a high electric resistance.
Moreover, a metal material acting as an electrode communicated to the power supply unit and the heating unit is mounted to both end portions of the heating roller.
Further, the electric resistance of the heating unit may either be adjusted by varying the thickness (laminated number) of the prepreg material including the carbon fiber, or may be adjusted by the angle of the mounted carbon fibers in each of the laminated prepreg material.
The carbon fiber of the heating unit is arranged uniformly in the circumferential direction of the roller, so as to realize a uniform surface temperature.


REFERENCES:
patent: 3649810 (1972-03-01), Tsuboi et al.
patent: 5655444 (1997-08-01), Kayser et al.
patent: 6108906 (2000-08-01), Fujita et al.

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