JPS60107670A - Heat fixing roll of copying machine - Google Patents

Abstract

PURPOSE:To improve the wear resistance of a heat roll to extend the life by forming a release layer of the heat roll with mixed materials of a perfluoroalkoxy resin and silicon carbide of 10-30% weight mixture ratio. CONSTITUTION:A release layer 33 consisting of a perfluoroalkoxy resin containg 10-30% weight ratio of silicon carbide is formed wth about 40mum thickness into a roll form around a core layer 31 and a primer layer 32 of a heat roll 3 having a heat source 30. By this constitution, the offset time up to exposure of the core layer 31 is about 125 hours and is extended considerably in comparison with a conventional offset time. Consequently, the life of the fixing roll is extended considerably, and expenses of maintenance are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat fixing roller of a copying machine that fixes toner mixed with a release agent to paper.

[Prior Art] Generally, in a copying machine that uses colored fine powder (toner) such as a polymeric material to form an electrostatic latent image on a sheet of paper, as shown in FIG.・Su-image 2
A fixing roller 3 and a pressure roller 4 are used to apply pressure and heat to fix the image.

Here, the fixing roller 3 has heat resistance (150° to 250'
O), is made of a silicone-based or fluorine-based material that satisfies mold releasability (toner offset prevention), oil resistance, etc., and has mechanical strength that can withstand pressure. Further, the pressure row 24 is made of a material having appropriate elasticity and having the same characteristics as the fixing roller 3.

The fixing roller 23 has a main function of fixing the toner image 2 formed on the paper 1 by heat, so it has a heat source 30 inside, and a core layer 31 and a primer layer are formed around the heat source 30. 32 is formed, and a mold release layer 33 is further formed around this primer layer 32.The mold release layer 33 in this case is made of a silicon-based or fluorine-based material that satisfies the above-mentioned characteristics. 1st+7 is completed.

However, in the conventional fixing roller, the release layer is made of filler (
5% by weight or less of glass or 3% by weight as filler)
Since the fixing roller is made of perfluoroalkoxy resin (PFA) containing silicon carbide (Sic), it has the drawback of insufficient wear resistance and short life as a fixing roller.

[Purpose of the invention]

The present invention has been made in view of these drawbacks, and an object of the present invention is to provide a heat-fixing lawn for a copying machine that has improved wear resistance and can extend its life.

[Structure of the invention]

In the present invention, the release layer is formed of a mixture of perfluoroalkoxy resin and silicon carbide (Sic), and the weight mixing ratio of silicon carbide is 10 to 30%.

(Example) FIG. 2 is a cross-sectional view of a core layer, a primer layer, and a release layer, which are the main parts of the present invention.
The mold release layer 33 formed in a roll shape around the
M7 is made of perfluoroalkoxy resin containing silicon carbide (Sic) of 0 to 30, and the layer thickness is set to about 40 μm.

As a result of forming the release layer 33 with such a material and testing the time until the core layer 31 is exposed (offcent time),
As shown in the characteristic curve A of FIG. 4, the release layer 33 of this embodiment
The offset time was approximately 125 hours, which is not shown in characteristic curve B, and was significantly extended to more than twice the offset time of the conventional release layer (approximately 50 hours).

〔Effect of the invention〕

As explained above, according to the present invention, since the FRTR type layer is composed of perfluoroalkoxy resin containing 10 to 30% by weight of silicon carbide, the abrasion resistance is greatly improved, and the life of the fixing roller is increased. It has the effect of significantly extending the time period, and can be expected to have extremely practical effects that can reduce maintenance costs.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the general configuration of a conventionally used pressure/fixing roller, and FIG. 2 is a sectional view showing the configuration of the female layer and its rim layer, which are the main parts of the present invention. FIG. 3 is a graph showing the test results of the offset time of the heat fixing roller according to the present invention. ■... Paper, 2... Toner image, 3... Fixing roller, 4 Pressure roller, 30 Heat source, 31... Core layer, 33... Release layer. 〆0 □迦′＃−

Claims (1)

[Claims] pa formed into a roll through a core layer around the heat source
A method of fixing toner that has a mold layer and contains a mold release agent (in some heat fixing rollers, the mold release layer is formed of a mixture of perfluoroalkoxy 1!'L1 fat and silicon carbide) and the weight mixing ratio of silicon carbide was set to 10 to 30 parts.