Roller Outer Layer with Soluble Ionic Salts for Conductivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rollers in printing systems do not provide a desired level of electrical conductivity and can cause long-term damage to imaging surfaces, leading to reduced image sharpness and resolution over time due to leaching of salts that diffuse electrostatic charges.
Innovation Solution
A developer roller with an outer layer composed of polymers, electrical conductivity enhancers like carbon black, and soluble ionic salts, which provides a desired level of electrical conductivity while minimizing the risk of 'hot spots and long-term damage to the imaging surface by dissolving any leached salts in the imaging liquid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing rollers are used, then the structure is simple, but the electrical conductivity is insufficient and causes long-term damage to imaging surfaces
Solution Approach 1:
The roller exterior layer uses a composite material system comprising polymer base material, carbon black particles for conductivity, and soluble ionic salts. This composite structure achieves the desired electrical conductivity (10^5 to 10^9 ohm/cm) while maintaining mechanical properties and preventing imaging surface damage through controlled salt dissolution in the imaging liquid.
2Reliability
If rollers with higher electrical conductivity are used, then conductivity improves, but salt leaching causes harmful effects on imaging surfaces over time
Solution Approach 1:
The soluble ionic salts in the roller exterior layer act as an intermediary mechanism. These salts dissolve into the imaging liquid during operation, providing ions that enhance electrical conductivity. The salts are contained within the roller structure and release controlled amounts into the imaging liquid, avoiding direct contact and damage to the imaging surface while maintaining necessary conductivity levels.
Solution Approach 2:
The invention changes the physical state and concentration parameters of ionic salts by dissolving them into the imaging liquid. The soluble ionic salts transition from solid particles in the roller matrix to dissolved ions in the imaging liquid, dynamically adjusting the electrical conductivity parameter of the imaging liquid during operation without requiring high salt concentrations in the roller that would cause damage.
3Reliability
If soluble ionic salts are added to the roller composition, then electrical conductivity is enhanced, but salt accumulation may degrade image quality
Solution Approach 1:
The soluble ionic salts serve as an intermediary between the roller and the imaging liquid, providing controlled ion release. The salts dissolve gradually into the imaging liquid during operation, maintaining electrical conductivity without accumulating to harmful concentrations. The imaging liquid acts as a carrier that distributes the dissolved salts uniformly, preventing localized accumulation that would degrade image quality.
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 solution maintains a desired level of electrical conductivity, reduces long-term damage to the imaging surface, and prevents the accumulation of salts that could degrade image quality, ensuring consistent performance and image sharpness.
Implementation Method 1
An exterior layer for a roller of a printing system includes a polymer and a conductivity enhancer. The conductivity enhancer may be carbon black or other materials that provide electrical conductivity.
Implementation Method 2
the outer layer having a composition that provides a desired level of electrical conductivity and reduces long-term damage to the imaging surface or its performance over time
Data Source
AI summary
A roller comprises an exterior layer including one or more polymers, carbon black and an ionic salt soluble in a low molecular weight hydrocarbon oil.