Textured Roller Gloss Reduction for Toner Print Engines
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Solution Overview
Problem
Toner-based print engines produce glossy images due to the inherent properties of toner and fusing processes, limiting market competitiveness as existing methods for gloss reduction are inefficient, expensive, and inflexible, with marginal results and high costs associated with switching toner formulations.
Innovation Solution
A method and apparatus using a textured roller that applies heat and pressure to imprint a high-frequency texture onto the toner surface, reducing specular gloss by increasing surface roughness, allowing for adjustable gloss levels using software control and compatible with existing toner formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If toner formulation is changed to solidify in a less smooth form, then gloss is reduced, but manufacturing complexity and cost increase due to multiple toner stockpiling and setup changes
Solution Approach 1:
The patent changes the physical state parameter of the toner by melting it to a liquid state and then rapidly cooling it to solidify in a non-smooth form, avoiding the need for multiple toner formulations. This parameter change approach resolves the contradiction by achieving gloss reduction through process control rather than material formulation changes.
Solution Approach 2:
The patent replaces the chemical formulation approach with a thermal-mechanical process. Instead of using different toner formulations, the system uses controlled heating and rapid cooling mechanisms to achieve the desired surface texture, thereby reducing manufacturing complexity.
2Object-generated harmful factors
If toner formulation is changed to reduce gloss, then specular reflection is reduced, but production time and cost increase due to setup changes and toner extraction
Solution Approach 1:
The patent uses parameter changes in the thermal processing regime - specifically rapid cooling rates - to achieve gloss reduction without requiring toner formulation changes or setup modifications. This allows continuous production with a single toner type.
Solution Approach 2:
The patent applies preliminary heating to melt the toner before the rapid cooling step, ensuring the toner is in the appropriate state for the gloss-reducing process. This preliminary action enables the subsequent rapid cooling to work effectively without requiring toner changes.
3Reliability
If toner is melted into liquid state for adherence, then image quality improves, but surface smoothness increases causing high gloss
Solution Approach 1:
The patent employs periodic thermal action - first heating to melt the toner for adherence, then rapidly cooling to solidify it in a non-smooth form. This periodic application of thermal energy achieves both good adherence and reduced gloss.
Solution Approach 2:
The patent utilizes phase transitions of the toner material - transitioning from solid to liquid during heating for adherence, then rapidly cooling to solidify in a textured state. This controlled phase transition sequence resolves the contradiction between adherence and surface smoothness.
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
Enables flexible and efficient reduction of gloss in printed images, maintaining high image quality with a single toner type, reducing specular reflection and enhancing market competitiveness by allowing adjustable gloss levels without the need for multiple toner formulations or expensive setup changes.
Implementation Method 1
application of a combination of heat and pressure with a textured roller
Implementation Method 2
application of a combination of heat and pressure with a textured roller
Data Source
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AI summary
The smoothness of a toner layer is reduced and thus the gloss of a resulting print is reduced. A single toner, the original high gloss version, is enabled to print all images. A finishing option is provided which, through application of a combination of heat and pressure with a textured roller, reduces the specular gloss of the toner surface by imprinting a high frequency texture onto the smooth toner layer. By adjusting the temperature/pressure of the textured roller, the effective gloss of the press can be adjusted through software as desired.