Fine-Bubble Toner Manufacturing to Reduce Reactor Scale
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Solution Overview
Problem
Wet toner manufacturing methods face issues with foam generation leading to scale adhesion, which causes stirring failures, temperature control issues, and productivity losses due to reactor vessel cleaning requirements.
Innovation Solution
A toner manufacturing method that involves forming resin particles in an aqueous medium with fine bubbles of specific size and concentration, which destabilize and rupture quickly, reducing scale adhesion and out-of-specification particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wet toner manufacturing method is used, then developability and transferability are improved, but scale adhesion occurs on reactor vessel wall and stirring blade
Solution Approach 1:
The patent converts the harmful effect of foam generation into a beneficial process feature by controlling foam formation and collapse to create fine bubbles that improve toner particle quality. The foam collapse that previously caused scale adhesion is now harnessed to generate beneficial fine bubbles with specific size distribution (0.1-10 μm) that enhance toner developability and transferability.
Solution Approach 2:
The patent changes physical parameters of the aqueous medium, specifically controlling bubble size distribution (0.1-10 μm) and concentration (10^5-10^8 bubbles/mL) to optimize the process. By adjusting these parameters, the system achieves reduced scale adhesion while maintaining improved developability and transferability of the toner particles.
2Ease of operation
If foam is generated during polymerization reaction, then mixing is enhanced, but scale adhesion accumulates on apparatus surfaces
Solution Approach 1:
The patent introduces dynamic control of foam generation and collapse during the polymerization process. By controlling the formation and subsequent collapse of foam, the system achieves enhanced mixing in the liquid phase while the foam collapse prevents persistent scale adhesion on apparatus surfaces. This dynamic approach allows mixing benefits without the detrimental accumulation of scale.
Solution Approach 2:
The patent utilizes periodic foam formation and collapse cycles during polymerization. The periodic nature of foam generation provides intermittent mixing enhancement, while the collapse phase prevents continuous scale adhesion buildup on reactor walls and stirring blades, maintaining operational efficiency.
3Productivity
If continuous production is performed, then productivity is improved, but scale adhesion accumulates causing cleaning requirements
Solution Approach 1:
The patent enables continuous production by controlling foam behavior to prevent scale adhesion accumulation. The fine bubble generation mechanism operates continuously without requiring interruption for cleaning, as the controlled foam collapse prevents scale buildup that would otherwise necessitate production suspension for maintenance.
Solution Approach 2:
The system achieves self-cleaning properties through controlled foam collapse. The foam generation and collapse process automatically prevents scale adhesion on apparatus surfaces, eliminating the need for external cleaning interventions and allowing uninterrupted continuous production.
4Duration of action of stationary object
If foam remains in reactor vessel for extended time, then reaction completion is ensured, but coarse particles are formed
Solution Approach 1:
The patent applies preliminary action by generating fine bubbles before and during the polymerization reaction. These pre-formed fine bubbles serve as nucleation sites that control particle formation, ensuring uniform particle size distribution and preventing coarse particle formation even when foam remains in the reactor for extended periods.
Solution Approach 2:
The fine bubbles act as an intermediary substance that mediates between reaction time and particle quality. By introducing controlled fine bubbles (0.1-10 μm) with specific concentration, the system allows extended reaction times for complete conversion while maintaining narrow particle size distribution and preventing coarse particle formation.
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 method effectively suppresses scale adhesion and reduces coarse particles by stabilizing fine bubbles, ensuring stable production and improved particle size distribution.
Implementation Method 1
the generated foam remains in the reactor vessel is reduced, which is expected to suppress scale adhesion to a certain extent. However, reducing the time cannot prevent foam generation completely, and the foam continues to cause scale formation
Implementation Method 2
a particle-forming process including forming a resin particle while foam is generated in an aqueous medium, wherein the aqueous medium contains a fine bubble
Data Source
AI summary
A toner manufacturing method including a particle-forming process including forming a resin particle while foam is generated in an aqueous medium, wherein the aqueous medium contains a fine bubble, and wherein the fine bubble has a number average particle size greater than or equal to 1.0×101 nm and less than or equal to 1.0×105 nm and has a number concentration greater than or equal to 1.00×105 bubbles/mL.