Sealing material with excellent sliding property and wear resistance and for prventing fine powder leakage

Abstract

A sealing member for preventing escape of micro particles, sealing a predetermined gap between a movable unit in contact with the micro particles and a housing of the movable unit, and adhered to the face of the movable unit or housing without impeding movement of the movable unit, based on a pile fabric configured with a pile yarn forming a sliding flock and a base cloth of plain woven tissue supporting the pile yarn, the pile yarn of the flock being formed of a high strength polyethylene fiber having a filament fineness of 0.1-6.0 dTex, a fiber cross section oblateness of at least 1.1, and an average tensile strength of at least 22 cN / dTex, and the flock having a height of 1.5-4.0 mm, a pile density of 13,000-346,000 filament / cm<2> at the pile yarn portion, and a pile yarn cross section area of 0.02-0.2 cm<2> per 1cm<2> of the base cloth, the inner surface of the base cloth has coat to prevent the emrging of flock.

Description

technical field [0001] The present invention relates to a sealing material for preventing the leakage of fine powder and granules. Specifically, it relates to, for example, in the gap between the magnetic roller and the outer sleeve of an electrophotographic copier using fine toner for obtaining sharp images. A sealing material that prevents fine toner from scattering from this gap. Background technique [0002] Usually, the developing chamber (also known as the developing device) of an electrophotographic copier or an office printer is surrounded by an appropriate outer sleeve, and the toner is supplied to the roller of the photoreceptor by an electromagnetic roller of the same developing chamber. And imaging. Next, paper is covered on the photoreceptor where the image is formed, and the toner on the surface of the photoreceptor is copied on the paper. Sealing materials are provided at portions of the outer sleeve corresponding to both ends of the magnet roller on the bea...

AI Technical Summary

Problems solved by technology

[0004] However, since the sliding part of the sealing material with a layered structure in (a) is made of felt, the fiber is unraveled, pulled out, and has poor recovery properties, and its sealing performance decreases during long-term use, resulting in toner leakage. The problem

In addition, when it is attached to the curved surface of the outer sleeve, creases are generated on the sliding part and gaps are formed, and toner may leak

[0005] For the sealing material with velvet layer structure in (b), in order to seal the gap between the outer sleeve and the roller, the length of the fluff must be more than 5mm. If fluorine fiber is used, there is a problem of high cost

[0006] Moreover, when the sealing material constituted by the layered structure in (c) above, when the toner in the developing chamber is a fine particle of 10 μm or less, no matter how the sealing material is used for sealing, there is still the problem of leakage of the fine toner.

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