Low-resistance charging roller and manufacturing method thereof

Abstract

The invention relates to a low-resistance charging roller which comprises the following components in parts by weight: 1000 parts of polyurethane, 15 parts of chain supporter, 10 parts of plasticizer,20 parts of chain extender, 15 parts of toluene di-isocyanate, 50 parts of black carbon, 10 parts of static agent and 6 parts of talcum powder. A manufacturing method of the low-resistance charging roller comprises the following steps: mixing the polyurethane, the chain supporter, the chain extender, the static agent and the talcum powder, and melting into a mixed liquid; milling colloid; sievingby a vibration sieve, and degassing through vacuum pumping; putting into a reaction kettle, adding the plasticizer, stirring, then adding the toluene di-isocyanate and the black carbon, vacuumizing,degassing and then pouring; and forming. The low-resistance charging roller has the advantages that a photosensitive drum of a printer can not be polluted or damaged by the low-resistance charging roller; the resistance is low and uniform; the wearing coefficient of a PU material is generally more than ten times that of a rubber material, the PU material can not be aged or does not generate ozone,and the service life of the PU material is 6-8 times that of a rubber roller; and the performance is stable, and the performance of the rubber roller is little changed with the change of temperatureand humidity.

Description

technical field [0001] The invention relates to a low-resistance charging roller and a manufacturing method thereof. Background technique [0002] The charging roller is a key part of the laser printer. Its function is to erase the remaining electronic image on the photosensitive drum and charge the drum surface with a uniform charge. With the continuous progress of printing, copying and facsimile technology, various types of models are frequently updated, and the technology of printing, copying and facsimile machines is becoming more and more mature. One of the important signs is the substantial increase in the speed of printing, copying and facsimile machines . For this reason, a new challenge has also been proposed to the charging rollers in these models—that is, the adjustment of the resistance value of the charging roller. That is to say: due to the high-speed rotation of the machine, the printing speed is increased, which requires the charging roller to quickly erase...

AI Technical Summary

Problems solved by technology

At present, the colloid layer of the charging roller produced in China is made of rubber material, at best it can only be a semi-conductor, and the resistance value is also 10. 7 Ω or more, the resistance value of the new charging roller after testing should be at most 10 5 Ω or less, so the resistance value of the colloidal layer of the rubber material can no longer meet the requirements of new models

At the same time, the products made of rubber materials cannot meet the requirements of environmental protection, and the charging roller causes pollution to the surface of the photosensitive drum during the charging process of the photosensitive drum.

At present, low-resistance charging rollers are still a blank in China, and such charging rollers required in China can only rely on imports