JP2009098475A5

JP2009098475A5 -

Info

Publication number: JP2009098475A5
Application number: JP2007270900A
Authority: JP
Filing date: 2007-10-18
Publication date: 2010-10-21

Claims

A preheating roller that heats a recording medium having a toner image surface that bears an image developed with a liquid developer containing toner and carrier in contact with a surface different from the toner image surface, and a preliminary that presses the preheating roller A preheating unit comprising a heating backup roller;
A fixing unit having a fixing roller that contacts the toner image of the recording medium heated by the preheating unit and fuses the toner image;
The fixing device according to claim 1, wherein the oil repellency of the surface layer of the preheating backup roller is lower than the oil repellency of the surface layer of the fixing roller fixing roller.

The fixing device according to claim 1, further comprising a bias applying unit configured to apply a bias voltage between the preheating roller and the preheating backup roller.

The fixing device according to claim 1, wherein a cleaning member is provided on the preheating backup roller.

The fixing device according to any one of claims 1 to 3, wherein a material of a surface layer of the preheating backup roller is silicon rubber.

The fixing device according to any one of claims 1 to 3, wherein a material of a surface layer of the preheating backup roller is fluororubber.

An image carrier for carrying an image developed with a liquid developer containing toner and carrier;
A transfer unit for transferring an image carried on the image carrier to a recording medium;
A preheating roller comprising a preheating roller that contacts and heats a surface different from the toner image surface of the recording medium, and a preheating backup roller that presses the preheating roller;
A fixing unit having a fixing roller that contacts the toner image of the recording medium heated by the preheating unit and fuses the toner image;
2. An image forming apparatus according to claim 1, wherein the oil repellency of the surface layer of the preheating backup roller is lower than the oil repellency of the surface layer of the fixing roller fixing roller.

Paper type determination means for determining the type of the recording medium;
The image forming apparatus according to claim 6, wherein a heating temperature of the preliminary heating roller is changed based on a determination result of the paper type determination unit.

Transferring a toner image developed with a liquid developer containing toner and carrier to a recording medium;
While being heated from a surface different from the toner image surface onto which the toner image of the recording medium onto which the toner image has been transferred, press with a preheating backup roller,
An image forming method comprising fixing a preheated recording medium by bringing a fixing roller whose surface layer is higher in oil repellency than the surface layer of the preliminary backup roller into contact with the toner image surface of the recording medium.