Three-Layer Transfer Belt Resistivity Gradient for Stable Image Transfer
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Solution Overview
Problem
Existing transfer belts in electrophotographic image forming apparatuses face challenges in achieving optimal image transfer performance due to unsatisfactory volume resistivity relationships and filler content in their layers, leading to issues like abnormal discharge and reduced transfer efficiency.
Innovation Solution
A transfer belt with three layers - a front surface layer, a base material layer, and a back surface layer - where the volume resistivity relationships satisfy R1 > R2 > R3 or R1 < R2 < R3, and conductive filler content is optimized within specific ranges to ensure efficient charge distribution and transfer current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the volume resistivity relationship between layers is not optimized, then the charging performance deteriorates, but image transfer performance remains acceptable
Solution Approach 1:
The patent applies local quality by optimizing the volume resistivity of each layer individually (front surface layer R1, base material layer R2, back surface layer R3) to create a gradient structure. This gradient resistivity distribution (R1 > R2 > R3 or R1 < R2 < R3) ensures that each layer performs its specific function: the front surface maintains charging performance, the base material facilitates charge distribution, and the back surface enables efficient charge discharge, thereby resolving the contradiction between charging performance and image transfer performance.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the volume resistivity values of each layer and their relationships. By establishing specific resistivity relationships (R1 > R2 > R3 or R1 < R2 < R3) and optimizing the conductive filler content in each layer, the patent transforms the electrical properties of the transfer belt to achieve both excellent charging performance and high-speed image transfer performance simultaneously.
2Productivity
If conductive filler content is increased to improve charge distribution, then transfer efficiency improves, but abnormal discharge occurs
Solution Approach 1:
The patent applies local quality by distributing conductive filler non-uniformly across different layers. Each layer has optimized filler content according to its specific function: the front surface layer has filler content optimized for charging stability, the base material layer has filler content optimized for charge distribution, and the back surface layer has filler content optimized for charge discharge. This localized optimization prevents abnormal discharge while maintaining high transfer efficiency.
Solution Approach 2:
The patent uses composite materials by combining organic conductive fillers (such as carbon black) with inorganic fillers in specific ratios and distributions across layers. This composite approach allows precise control over electrical conductivity, enabling the transfer belt to achieve high transfer efficiency without experiencing abnormal discharge, as the composite structure provides both conductive pathways and insulating barriers.
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
The optimized resistivity and filler content improve image transfer performance by maintaining charging performance while reducing residual charge, enhancing toner image transferability and efficiency.
Implementation Method 1
a base material layer including at least one elastic material selected from the group consisting of rubber and an elastomer
Implementation Method 2
a relationship between a volume resistivity R1 of the front surface layer, a volume resistivity R2 of the base material layer, and a volume resistivity R3 of a back surface layer
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
A transfer belt includes three layers of a front surface layer, a base material layer including at least one elastic material selected from the group including rubber and an elastomer, and a back surface layer, in which a relationship between a volume resistivity R1 of the front surface layer, a volume resistivity R2 of the base material layer, and a volume resistivity R3 of the back surface layer in an environment of 25°C and 55% RH satisfies Expression 1 or 2. R1>R2>R3 R1<R2<R3