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Heater and picture foring device containing heater

A heating device and technology to be heated, applied in the direction of drum heating device, induction heating device, electric heating device, etc., can solve the problems of uneven heating, uneven gloss, heating roller failure, etc., and achieve good heat resistance and high gloss characteristics , the effect of preventing surface hardening

Inactive Publication Date: 2003-04-16
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the heating roller with a hard surface heats the toner image formed on the material to be heated, the heating roller cannot conform to irregular unevenness, resulting in uneven heating
This can cause color fixation to fail and produce an uneven sheen
In particular, when fixing a color image formed by stacking toner images of a plurality of different colors, it is impossible to obtain sufficient color fixability

Method used

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  • Heater and picture foring device containing heater
  • Heater and picture foring device containing heater
  • Heater and picture foring device containing heater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The heating roller 2 includes a second elastic layer 11 sandwiched between a conductive layer 10 and a release layer 12 . Here, the color fixing performance was examined for the action of the second elastic layer 11 formed in the heating roller 2 .

[0068] Stated below are the conditions satisfied by the elements constituting the color fixing device 1 under the evaluation regarding the color fixing performance. Here, the heat roller 2 is configured as follows. On the core body 8 made of hollow metal made of aluminum with an outer diameter of 28 mm, a first elastic layer 9 is formed, which is a 6 mm thick sponge elastic layer obtained from foamed silicone rubber. The conductive layer 10 is located on the outer periphery of the first elastic layer 9 and is composed of a 40 μm thick nickel metal sleeve. The following is an evaluation of three different types of heated rollers:

[0069] (1) In the heating roller, only a peeling layer 12 with a thickness of 30 μm is form...

Embodiment 2

[0081] In Example 1, the appropriate thickness of the second elastic layer 11 was checked. In Example 2, the elongational modulus of elasticity of the peeling layer 12 related to obtaining a high-quality image was examined.

[0082] In the heat roller 2, the thickness of the second elastic layer 11 was set to 150 μm, and the thickness of the release layer 12 was set to 30 μm. Here, the elongation modulus of elasticity of the release layer 12 is set to three different levels: 1.96×10 8 Pa(0.2×10 4 kg / cm 2 );5.88×10 8 Pa(0.6×10 4 kg / cm 2 );9.8×10 8 Pa(1.0×10 4 kg / cm 2 ). That is, three different heating rollers are prepared, each installed in the color fixing device 1, respectively. Then, the color fixing performance of the heat roller 2 and its effect on the fixed image were examined. In Example 2, the color fixing temperature was set at 170°C. An unfixed color toner image composed of a single-layer color toner image is formed on the recording paper 5 . The viscous...

Embodiment 3

[0091] Next, the effect of the surface roughness of the peeling layer 12 on the color fixing performance was examined. In this embodiment, two different heating rollers 2 are prepared. In one of them, the surface roughness of the peeling layer 12 is set to 0.3 μm based on the average surface roughness Ra on the center line, or 1.0 μm based on the ten-point average surface roughness Rz. In another of these, the surface roughness of the peeling layer 12 is set to 0.4 μm based on Ra, or 2.0 μm based on Rz. In the color fixing device 1 including each heating roller 2, the color fixing performance was evaluated on the basis of an area without shift. Also, in the present embodiment, the thickness of the second elastic layer 11 of the heating roller 2 is set to 150 μm, and the thickness of the release layer 12 is set to 30 μm. Here, the elongation modulus of elasticity of the release layer 12 is 5.88×10 8 Pa. The color fixing temperature was set at 170°C. Other conditions are th...

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Abstract

The present invention discloses a heating apparatus and an image forming apparatus incorporating the same. The fixing apparatus which acts as a heating apparatus, includes a heating roller; a pressure-applying roller, arranged face to face with the heating roller, for allowing a recording sheet to be conveyed by the heating and pressure-applying rollers as nipped therebetween; and a heating device for heating the heating roller. The heating roller has a first elastic layer made of an elastic material, a conductive layer disposed in the outer periphery of the first elastic layer, an elasticity-imparted second elastic layer disposed in the outer periphery of the conductive layer, and a peeling layer disposed in the outer periphery of the second elastic layer. The conductive layer of the heating roller is induction-heated by the heating device, thereby reducing the warm-up time. By providing the second elastic layer, adequate elasticity is imparted to the heating roller's surface. The toner image on the recording sheet excels in fixability and gloss property.

Description

technical field [0001] The present invention relates to a heating device used in conjunction with a color fixing device for a dry electrostatic copying device; a drying device for a wet electrostatic copying device; a drying device for an inkjet printer; or a An erasing device for rewritable media. The present invention also relates to an imaging device using the heating device. Background technique [0002] Heretofore, a heating device has been used as a fixing device for fixing a toner image on recording paper in an electrophotographic copying machine or a printer. In conventional fixing devices, halogen lamps are provided in heating rollers with hollow metals made of aluminum or similar metals. Driving the halogen lamp to release heat can heat the heating roller to a predetermined temperature. [0003] However, the above-mentioned method of using a halogen lamp causes a problem that a long warm-up time is required due to a slow temperature rise at the beginning of heat...

Claims

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Application Information

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IPC IPC(8): B41J11/00F16C13/00G03G15/20H05B3/00H05B6/02H05B6/14
CPCG03G15/2053H05B6/145H05B3/0095B41J11/002H05B6/105B41J11/0024
Inventor 前田智弘香川敏章
Owner SHARP KK
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