Conductive Urethane Foam Toner Roller Hardness Stability
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Solution Overview
Problem
Existing conductive urethane foam toner supply rollers experience changes in hardness and impact resilience after impregnation with a binder resin, affecting their stability and charge-imparting performance, leading to inconsistent image quality.
Innovation Solution
A conductive urethane foam with a surface layer impregnated using a binder resin containing a silicone resin and Ketjen black, where the silicone resin content is between 0.3 to 6.0 parts by mass and Ketjen black content is between 0.45 to 9.0 parts by mass, to stabilize the charge-imparting effect and minimize changes in hardness and impact resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the urethane foam is impregnated with a binder resin containing a conducting agent, then the charge-imparting effect is enhanced and stabilized, but the hardness increases and impact resilience decreases
Solution Approach 1:
The patent applies parameter changes by carefully controlling the content of conducting agent (0.01-10 parts by mass per 100 parts urethane foam) and binder resin (0.1-20 parts by mass per 100 parts urethane foam) to optimize the balance between charge-imparting effect and mechanical properties. This quantitative parameter adjustment resolves the contradiction by finding the optimal impregnation levels that provide sufficient conductivity while minimizing hardness increase and impact resilience loss.
Solution Approach 2:
The patent uses composite materials by combining urethane foam with a binder resin containing conducting agents (such as carbon black, metal particles, or conductive polymers). This composite structure provides the necessary electrical conductivity for charge imparting while the urethane foam base material maintains the mechanical flexibility and impact resilience, resolving the contradiction between electrical performance and mechanical properties.
2Productivity
If the urethane foam is impregnated with a binder resin containing a conducting agent, then the electric resistance is reduced and toner conveyance amount increases, but the hardness increases and impact resilience decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the conducting agent content (0.01-10 parts by mass per 100 parts urethane foam) and binder resin content (0.1-20 parts by mass per 100 parts urethane foam) to achieve the desired electrical resistance reduction while minimizing the impact on mechanical properties. This parameter optimization resolves the contradiction between productivity improvement and mechanical property preservation.
Solution Approach 2:
The patent employs composite materials consisting of urethane foam impregnated with a binder resin containing conducting agents. This composite structure provides the necessary electrical conductivity for increased toner conveyance while the urethane foam matrix maintains the impact resilience, resolving the contradiction between productivity enhancement and mechanical property preservation.
3Productivity
If the urethane foam is impregnated with a binder resin containing a conducting agent, then the charge amount of toner decreases and conveyance amount increases, but the hardness increases and impact resilience decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the conducting agent content (0.01-10 parts by mass per 100 parts urethane foam) and binder resin content (0.1-20 parts by mass per 100 parts urethane foam) to achieve the optimal balance between charge amount reduction and impact resilience maintenance. This parameter control resolves the contradiction between productivity improvement and mechanical property preservation.
Solution Approach 2:
The patent uses composite materials comprising urethane foam impregnated with a binder resin containing conducting agents. This composite structure enables the reduction of toner charge amount for increased conveyance while the urethane foam base material preserves the impact resilience, resolving the contradiction between productivity enhancement and mechanical property preservation.
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 configuration maintains a stable charge-imparting effect and reduces changes in hardness and impact resilience, ensuring excellent performance and stability of the toner supply roller.
Implementation Method 1
impregnating a surface layer of an urethan foam substrate material of a conductive urethane foam with a binder resin containing a conducting agent, thereby reducing electric resistance of the toner supply roller
Implementation Method 2
PTL 4 discloses, in order to well prevent the influence of a charge due to friction between toner on a toner supply roller and a developing roller and stabilize and enhance a charge-imparting effect
Implementation Method 3
an object of the present disclosure is to provide a conductive urethane foam capable of curbing changes in hardness and impact resilience thereof between prior to and after being impregnated with a binder resin
Data Source
AI summary
An object of the present disclosure is to provide a conductive urethane foam capable of curbing changes in hardness and impact resilience thereof between prior to and after being impregnated with a binder resin, while keeping a stable charge-imparting effect thereof. To achieve the object, the present disclosure proposes a conductive urethane foam including an urethane foam substrate material having a surface layer impregnated with a binder resin containing a conducting agent: wherein the binder resin contains a silicone resin.