Solid Lubricant Adhesion for Image Density Uniformity
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Solution Overview
Problem
In electrophotographic image forming apparatuses, existing solid lubricants fail to adequately prevent image density unevenness and cleaning failures due to insufficient applicability and unevenness on the image bearing member, leading to accelerated abrasion of the cleaning blade and image bearing member.
Innovation Solution
A solid lubricant comprising a fatty acid metal salt and polyethylene with an acid value is applied to the image bearing member, enhancing adhesion and affinity, thereby preventing application unevenness and suppressing image density unevenness and cleaning blade abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a solid lubricant comprising a wax and a metal soap is applied on the image bearing member, then image density unevenness is suppressed, but applicability is insufficient causing application failure or unevenness
Solution Approach 1:
The patent uses a composite material system consisting of metal soap (fatty acid metal salt) combined with specific waxes (polyethylene, polypropylene, or microcrystalline wax) in defined weight ratios. This composite approach resolves the contradiction by combining the image density control benefits of metal soap with the applicability improvements provided by the wax components, achieving both uniform image density and reliable lubricant application.
Solution Approach 2:
The patent specifies precise parameter ranges for the lubricant composition: metal soap content at 90-99.9 wt%, polyethylene at 0.1-5 wt%, and controlled acid value (3-50 mg KOH/g). These parameter changes optimize both the applicability and the image density uniformity by fine-tuning the chemical composition and physical properties of the solid lubricant.
2Device complexity
If metal soap is used alone as a lubricant, then application is simplified, but image density unevenness occurs in intermediate density areas
Solution Approach 1:
The patent creates a composite lubricant by combining metal soap with specific waxes (polyethylene, polypropylene, or microcrystalline wax) in optimized ratios. This composite material maintains the simplicity of metal soap application while adding the necessary components to prevent image density unevenness in intermediate density areas, thus resolving the contradiction between simplicity and image quality.
3Device complexity
If the lubricant has insufficient applicability, then application process is simpler, but cleaning blade abrasion is accelerated
Solution Approach 1:
The patent optimizes the physical and chemical parameters of the solid lubricant, specifically controlling the acid value (3-50 mg KOH/g) and specifying wax content (0.1-10 wt%), to enhance applicability. These parameter changes ensure proper adhesion to the image bearing member surface, preventing cleaning blade abrasion while maintaining a simple application process.
Solution Approach 2:
The wax components (polyethylene, polypropylene, or microcrystalline wax) act as intermediary substances that facilitate the application of metal soap to the image bearing member. These intermediaries improve the spreadability and adhesion of the lubricant, ensuring uniform coverage that protects the cleaning blade without complicating the application process.
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 solid lubricant ensures stable application and reduced abrasion, maintaining image quality by forming an even lubricant layer that prevents image density unevenness and cleaning failures, even with varying coverage and components left after transfer.
Implementation Method 1
a polyethylene having an acid value... enhancing adhesion and affinity
Implementation Method 2
solid lubricant... suppressing abrasion of the surface of the image bearing member and a cleaning blade
Data Source
AI summary
A solid lubricant containing a fatty acid metal salt and a polyethylene having an acid value is prepared. The solid lubricant is disposed so as to be applied on a surface of an image bearing member of an image forming apparatus in electrophotography, and a lubricant layer is formed on the surface of the image bearing member with the solid lubricant.