Printing Fluid Mixing for Uniform Solid-to-Liquid Ratio Control
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Solution Overview
Problem
In liquid electro-photography (LEP) printing systems, variations in the solid-to-liquid weight ratio of printing fluid due to recovered and fresh fluid additions lead to non-uniform printing fluid profiles, causing image quality defects such as color inconsistency and faulty transfer.
Innovation Solution
A mixing device with a solute addition member, first and second mixers, and a controller adjusts the solid-to-liquid ratio by adding solids to a printing fluid tank, reducing particle size through mixers and sonotrodes, and controlling the process based on fluid density levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If printing fluid is recovered and fresh fluid is added to the printing fluid tank, then the printing fluid supply is maintained, but the solid-to-liquid weight ratio becomes non-uniform causing image quality defects
Solution Approach 1:
The mixing device performs preliminary mixing of printing fluid before it enters the printing system. The device includes a mixing chamber where printing fluid is continuously mixed with a mixer before being supplied to the printing system, ensuring uniform solid-to-liquid ratio is achieved in advance
Solution Approach 2:
The controller monitors the printing fluid properties and adjusts the mixing process accordingly. The system uses feedback control to maintain consistent solid-to-liquid weight ratio by adjusting mixer operation and fluid flow rates based on monitored parameters
2Stability of the object's composition
If solids are added to adjust the solid-to-liquid ratio, then the composition uniformity is improved, but the particle size of solids must be reduced through additional mixing
Solution Approach 1:
The mixing process is divided into multiple stages: a first mixing stage where solids are initially mixed with printing fluid, and a second mixing stage where the mixture is further processed. This segmentation allows for progressive reduction of particle size and achieves uniform composition through controlled sequential mixing
Solution Approach 2:
The mixing device employs mechanical mixing elements that create turbulent flow and reduce particle size through mechanical action. The mixer generates shear forces and turbulent mixing that break down solid particles and distribute them uniformly throughout the printing fluid
3Manufacturing precision
If the printing fluid density level changes, then the composition varies, but maintaining density requires continuous monitoring and adjustment
Solution Approach 1:
The controller continuously monitors printing fluid density level and adjusts the mixing process in real-time. When density deviations are detected, the controller automatically adjusts mixer operation, fluid flow rates, and solid addition rates to maintain target density and composition
Solution Approach 2:
The mixing device is designed to automatically maintain printing fluid composition without external intervention. The system self-regulates by monitoring its own output and adjusting mixing parameters to maintain consistent density and solid-to-liquid ratio
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 consistent solid-to-liquid ratio, reducing image quality defects by ensuring uniform printing fluid composition and improving transfer efficiency.
Implementation Method 1
the first mixer is to mix the added solids with the printing fluid moved by the pump, and the second mixer is to mix the printing fluid within the second chamber
Implementation Method 2
the second mixer may be an ultrasonic generator mechanically coupled to a sonotrode
Data Source
AI summary
According to an example, a mixing device comprises a first chamber including a solute addition member and a first mixer, a second chamber including a second mixer, a printing fluid pump, and a controller operatively connected to the solute addition member, the pump, the first mixer, and the second mixer. The controller is to control the pump to move printing fluid towards the printing fluid tank based on a printing fluid density level in the printing fluid tank, to control the solute addition member to add solids based on the printing fluid density level, and to control the first mixer and the second mixer to mix the added solids with the printing fluid moved by the pump.