Brilliant and Chromatic Toner Set for Gloss Uniformity
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Solution Overview
Problem
Existing toner sets face challenges in preventing gloss unevenness during image formation, particularly when combining brilliant and chromatic toners, due to thermal conductivity differences and release agent inhibition, leading to hot offset and reduced image brilliance.
Innovation Solution
A toner set comprising a brilliant toner with a flake metal pigment and a chromatic toner, where the endothermic quantity of the brilliant toner is between 1.2 to 5 times that of the chromatic toner, along with specific pigment and binder resin configurations, to control heat application and prevent gloss unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If brilliant toner and chromatic toner are collectively fixed, then image formation efficiency is improved, but gloss unevenness occurs due to thermal conductivity differences
Solution Approach 1:
The patent changes the thermal parameter (endothermic quantity) of the brilliant toner by adjusting the ratio of crystalline resin to amorphous resin, specifically setting the endothermic quantity to 1.05-1.30 times that of chromatic toner. This parameter adjustment ensures uniform heat absorption during collective fixing, preventing gloss unevenness while maintaining high image formation efficiency
Solution Approach 2:
The patent utilizes the phase transition properties of crystalline and amorphous resins during the fixing process. The crystalline resin provides a controlled endothermic phase transition that regulates heat absorption, while the amorphous resin ensures smooth melting and flow. This combination of phase transition behaviors enables uniform heat distribution and prevents gloss unevenness during collective fixing of brilliant and chromatic toners
2Object-affected harmful factors
If release agent is added to brilliant toner, then hot offset is prevented, but release agent exusion is inhibited by flake metal pigment
Solution Approach 1:
The patent adjusts the glass transition temperature parameter of the binder resin to a specific range (40-80°C) and controls the endothermic quantity ratio. These parameter changes create optimal conditions for release agent exusion by ensuring the binder resin becomes sufficiently soft and pliable during fixing, allowing the release agent to migrate to the toner surface despite the presence of flake metal pigment
Solution Approach 2:
The patent employs a composite binder resin system combining crystalline and amorphous resins in specific proportions. This composite material structure provides both the structural integrity needed to hold flake metal pigment and the thermal responsiveness needed to facilitate release agent exusion. The crystalline resin provides thermal stability while the amorphous resin provides flexibility, creating a synergistic effect that overcomes the barrier effect of flake metal pigment
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 effectively prevents gloss unevenness and maintains image brilliance by adjusting the heat quantity and pigment arrangement, ensuring consistent metal gloss in the final image.
Implementation Method 1
Q1 represents an endothermic quantity of the brilliant toner, and Q2 represents an endothermic quantity of the chromatic toner
Data Source
AI summary
A toner set includes a brilliant toner including a brilliant pigment; and a chromatic toner including a coloring agent that is different from the brilliant pigment, wherein the toner set satisfies the following expression:1.2≦Q1/Q2≦5.0wherein Q1 represents an endothermic quantity of the brilliant toner and Q2 represents an endothermic quantity of the chromatic toner.