Two-Sided Image Fixing Temperature Control
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Solution Overview
Problem
In the electrographic system using a two-component developer with phenol-formaldehyde resin, the heat accumulation during thermal fixing leads to reduced image density and toner scattering due to variations in the electrostatic charge properties of the carrier and developer.
Innovation Solution
The method involves forming images on both sides of a recording sheet using a two-component developer with toner particles containing a binder resin and colorant, where the heat fixing process is conducted at a surface temperature between the glass transition temperature of the binder resin and 100°C, controlling the temperature rise and electrostatic charge properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal fixing is conducted at high temperature to ensure proper image fixation, then fixing reliability is improved, but heat accumulation causes temperature rise in the device leading to reduced image density and toner scattering
Solution Approach 1:
The patent introduces temperature control parameters to monitor and adjust the device internal temperature during both-sided image forming. By detecting temperature rise caused by heat accumulation and adjusting fixing conditions accordingly, the system maintains consistent image density and prevents toner scattering while ensuring proper fixation reliability.
2Reliability
If phenol-formaldehyde resin carrier is used to achieve high electrostatic charge giving property, then charge providing capability is improved, but heat-induced evaporation of monomer component reduces charge providing capability leading to toner scattering
Solution Approach 1:
The patent implements a feedback mechanism where temperature sensors monitor the device internal temperature, and this information is used to adjust operating conditions in real-time. When temperature rise is detected that could cause monomer evaporation from the phenol-formaldehyde resin carrier, the system modifies fixing parameters to maintain stable charge providing capability and prevent toner scattering.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures stable image density and prevents toner scattering, resulting in high-quality images on both sides of the recording sheet.
Implementation Method 1
the phenol-formaldehyde resin forming the carrier, monomer component (formaldehyde) remains, and this monomer component is the low molecular weight, and has the polar group, and when this monomer component exists, the high electrostatic charge giving property of the carrier to the toner can be obtained
Implementation Method 2
when the fixing processing is conducted by the heating system, the high temperature recording sheet holding the heat by the fixing processing circulates in the device
Implementation Method 3
the heat fixing process is conducted at a surface temperature between the glass transition temperature of the binder resin and 100°C
Implementation Method 4
the first electrostatic latent image is formed on the electrostatic latent image carrier
Data Source
AI summary
An image forming method of forming images on both sides of a recording sheet; comprising the steps of: fixing a first toner image on a first surface a recording sheet; and fixing a second toner image on a second surface of the recording sheet; wherein in two-component developer includes toner particles each containing a binder resin having a glass transition temperature Tg° C. and a colorant and carrier particles in each on which magnetic powder is dispersed in a binder resin including a phenol formaldehyde obtained by a polymerization process, and the first toner image is fixed with first heat in such a way that the surface temperature of the first surface of the recording sheet is a temperature in a range of Tg° C. or more and lower than 100° C.