JP2007131790A5 - - Google Patents

Description

The durometer hardness of the base material is in accordance with JIS K6253, and it is an essential requirement that it is in the range of A50 / S to A85 / S, and more preferably in the range of A60 / S to A80 / S. It is. If the durometer hardness of the base material is less than A50 / S, problems such as the transfer image quality worsening due to excessive surface elongation due to the nip pressure occur. On the other hand, when A85 / S is exceeded, since the flexibility is poor and the nip shape cannot be secured, problems such as poor transfer image quality occur. In order to adjust the durometer hardness of the base material to the above range, the type of rubber may be appropriately selected, and the addition amount of the non-fibrous resin and the fibrous resin to be added to the rubber may be appropriately adjusted within the above range. The durometer hardness of the substrate can be increased as the addition amount of the non-fibrous resin and the fibrous resin is increased, and as the fineness of the fibrous resin is increased.
The durometer hardness of the base material is based on JIS K6253 (1997), and the standard hardness is measured using a type A durometer by stacking sheet-shaped base materials to a thickness of 6 mm.

Furthermore, the semiconductive belt of the present invention, in case where an intermediate transfer belt and the transfer conveyance belt in the image forming apparatus utilizing crowded viewed pairs, it is preferable to use spherical toner as the toner. By using a spherical toner as the toner, the material constituting the transfer surface has a low surface hardness and a high volume resistance, thereby obtaining a high-quality transfer image quality free from image quality defects (holocharacter, blur, color registration). be able to.

Claims (10)

A semiconductive belt having a substrate and a surface layer,
The base material contains rubber, a non-fibrous resin, and a fibrous resin, and the durometer hardness of the base material is in a range of A50 / S to A85 / S,
The semiconductive belt is characterized in that the tensile stress at 3% elongation of the semiconductive belt is in the range of 4 Mpa to 25 MPa, and the permanent elongation at 3% elongation is in the range of 2% or less. The base material is contained in a range of 25 to 50 parts by mass of non-fiber-shaped resin and in a range of 20 to 30 parts by mass of fiber-shaped resin with respect to 100 parts by mass of rubber. The semiconductive belt according to claim 1. The semiconductive belt according to claim 1 or 2, wherein the rubber comprises epichlorohydrin rubber and acrylonitrile-butadiene rubber. The volume resistivity of the substrate is 1 × 10 ⁸ Ωcm or more 1 × 10 ¹² The semiconductive belt according to any one of claims 1 to 3, which is in a range of Ωcm or less. The semiconductive belt according to any one of claims 1 to 4, wherein a resin layer containing a fluororesin is provided as the surface layer. Volume resistivity is 1 × 10 ⁸ Ωcm or more 1 × 10 ¹² The semiconductive belt according to any one of claims 1 to 5, wherein the belt is in a range of Ωcm or less. An image forming apparatus comprising the semiconductive belt according to claim 1 . The image forming apparatus according to claim 7, wherein the semiconductive belt is stretched between a plurality of stretch rolls and is arranged in contact with the shape of a drum-shaped image carrier. The image forming apparatus according to claim 7, wherein the semiconductive belt is provided as an intermediate transfer belt and / or a sheet conveying belt. The image forming apparatus according to claim 7, wherein a spherical toner having a shape factor SF defined by the following formula (1) in a range of 140 to 100 is used.
Formula (1)
SF = [(maximum length of toner particles) ² / (Projection area of toner particles)] × π / 4 × 100