Endless belt for image-forming apparatuses, and image-forming apparatus

An endless belt and image technology, which is applied to the electric recording process using the charge pattern, equipment and instruments for the electric recording process using the charge pattern, and can solve the problem of large inhomogeneity of resistivity and toner transfer efficiency. Easy to deteriorate, poor toner releasability and other problems, to achieve the effect of excellent bending resistance or chemical resistance, excellent external environment stability, and excellent molding dimensional stability

Inactive Publication Date: 2008-12-17
MITSUBISHI RAYON CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] In ribbons alloyed with thermoplastic resin and thermoplastic elastomer (Patent Documents 6 and 7), since the dispersibility of thermoplastic resin and thermoplastic elastomer is poor, carbon is easily aggregated, and therefore, there is a large dependence of resistance value on voltage, and resistance Tendency to increase the unevenness of the rate
In addition, there is a problem that the voltage dependence of resistivity and the change of resistivity due to temperature and humidity also become large, and high-precision image quality cannot be obtained under all conditions of use.
In addition, when installed in an image forming apparatus, there is also a problem of leakage resistance of the annular belt due to application of high voltage
[0042] A tape obtained by alloying a thermoplastic resin and a low-melting-point thermoplastic elastomer (Patent Document 8) has a problem of image shift because the tape is easily stretched by using a low-melting-point thermoplastic elastomer.
In addition, since the releasability of the toner in the soft segment portion of the thermoplastic elastomer is poor, there is a problem that the transfer efficiency of the toner from the belt to the secondary transfer portion of the paper tends to deteriorate.
In addition, when the extrusion molding method is used, it is difficult to make the endless belt into a perfect circle due to its high flexibility, and there is a problem that post-processes such as heat treatment are necessary.
In addition, since there are few crystalline components, the chemical resistance is poor, and there is also a problem of deterioration due to the influence of silicone oil, etc. generated from the fixing member, etc.
[0043] A tape with reduced elongation and flexibility (Patent Document 9) obtained by extrusion molding a laminated tape of a thermoplastic resin and a thermoplastic elastomer has mutual influence due to disturbance of the flow characteristics of various molten resins during molding. The resistance of the layer has an influence, so there is a problem of uneven resistance value of the band
In addition, since the surface layer is a thermoplastic elastomer, there are few crystalline components, poor chemical resistance, and there is a problem of deterioration due to the influence of silicone oil, etc. generated from the fixing member, etc.

Method used

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  • Endless belt for image-forming apparatuses, and image-forming apparatus
  • Endless belt for image-forming apparatuses, and image-forming apparatus
  • Endless belt for image-forming apparatuses, and image-forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～4

[0418]

[0419] These examples are examples for explaining the inventions of the first point, the second point, and the fourth point.

Embodiment 1～4

[0421] Heat kneading was performed at the compounding ratio described in Table 1 to obtain material pellets. The heating and kneading conditions at this time are as shown in Table 1. Adjust the resin temperature and the residence time in the kneader, and adjust the kneading conditions so that the resistance in the kneader becomes a semi-conductive region while suppressing the reaction in the kneader. Pellets of this material are extruded to produce endless belts. In addition, in Table 1, the amounts of the carbon black, the chelating agent, and the tackifier in compounding * are parts by weight relative to 100 parts by weight of the total amount of the thermoplastic elastomer and the thermoplastic resin.

[0422] For any kind of annular belt, the average surface resistivity SR (100V) is 1×10 11 ~2×10 11 Ω / □, the average volume resistivity VR (100V) is 3.6×10 10 ~6.0×10 10 Ω·cm, the voltage dependence of surface resistivity from 100V to 500V SR(100V) / SR(500V) is 1.5 to 5, w...

Embodiment 5

[0426] An endless belt was obtained in the same manner as in Example 1 except that the type of thermoplastic elastomer was changed. Also in Example 5, an endless belt with excellent appearance and less variation in resistivity and low resistivity due to the environment can be obtained. When this endless belt is installed in an image forming apparatus, a good image can be obtained. The main production conditions and various characteristics at this time are shown in Table 1 and Table 2.

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PUM

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Abstract

The present invention relates to satisfying the following formulas (1), (2) and (3): SR(100V) / SR(500V)<VR(100V) / VR(250) (1), SR(100V) / SR(500V) ≤30(2), 8≤VR(100V) / VR(250V)≤100(3); (where, SR(100V) represents the surface resistivity measured by applying a voltage of 100V for 10 seconds, SR(500V) Indicates the surface resistivity measured by applying a voltage of 500V for 10 seconds, VR(100V) indicates the volume resistivity when a voltage of 100V is applied for 10 seconds, and VR(250V) indicates the measurement when a voltage of 250V is applied for 10 seconds The volume resistivity of the image forming apparatus endless belt and the image forming apparatus using the image forming apparatus endless belt, the endless belt is formed by molding a thermoplastic elastomer and a thermoplastic resin and a conductive substance compound. The belt for an image forming apparatus is excellent in bending resistance, chemical resistance, dimensional stability, electrical resistance, and external environmental stability of these properties, and can obtain high image quality and high durability at low cost.

Description

technical field [0001] The present invention relates to an endless belt for an image forming apparatus and the image forming apparatus, in particular, to an endless (endless) endless belt for an image forming apparatus having excellent physical properties such as molding dimensional stability and bending resistance, and an image having the endless belt. forming device. The endless belt of the present invention is suitable as a belt for image forming devices such as intermediate transfer belts, conveyance transfer belts, photoreceptor belts, and fixing belts used in electrophotographic copiers, laser printers, LED printers, facsimile machines, and the like. Background technique [0002] Conventionally, an electrophotographic system using a photoreceptor and toner has been designed and marketed as an image forming apparatus such as an OA device. In these devices, photoreceptor belts, intermediate transfer belts, conveyance transfer belts, transfer separation belts, charging t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/16G03G15/08G03G15/20G03G21/00G03G5/10
Inventor 森越诚大津纪宏山冈克史水本和也
Owner MITSUBISHI RAYON CO LTD
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