Toner Formulation Mass Flow Control via Conductive Additives
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Solution Overview
Problem
As toner particle size decreases, the control over mass flow in printing degrades, leading to increased mass flow and various print defects, making it challenging to maintain mass flow within a given range.
Innovation Solution
A toner composition including toner particles of 1-25 μm size, combined with silica particles and conductive additives having a volume resistivity of E−6 to E6 ohm-cm, which are mixed at specific concentrations to achieve a controlled mass flow of 0.2 to 1.5 mg/cm2, thereby improving mass flow control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If toner particle size is reduced to achieve high resolution printing, then printing resolution is improved, but mass flow control deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing conductive additives with specific volume resistivity ranges (E-6 to E6 ohm-cm) and adjusting their concentration (0.01-5% by weight) to control mass flow. This changes the electrical properties of the toner composition, enabling mass flow control within the desired range of 0.2 to 1.5 mg/cm2 while maintaining fine particle sizes for high resolution printing.
Solution Approach 2:
The patent uses composite materials by combining toner particles with conductive additives (such as carbon black, metal oxides, or conductive polymers) to create a multi-component system. This composite structure allows the toner to maintain both fine particle size for resolution and controlled mass flow through the conductive properties of the additive package.
2Measurement precision
If toner particle size is reduced, then printing resolution is improved, but mass flow increases causing print defects
Solution Approach 1:
The patent changes the electrical resistance parameter of the toner composition by incorporating conductive additives with volume resistivity in the range of E-6 to E6 ohm-cm. This parameter change reduces excessive mass flow (to 0.2-1.5 mg/cm2) while preserving the fine particle size needed for high resolution printing, thereby preventing print defects.
Solution Approach 2:
The conductive additive acts as an intermediary substance that mediates between the fine toner particles and the printing system. It controls the mass flow of toner particles without altering their size, enabling both high resolution and controlled material delivery by facilitating proper charge distribution and flow characteristics.
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 use of conductive additives in the toner composition effectively reduces mass flow to a controlled range, enhancing print quality by maintaining mass flow within an operating window, even at high print speeds and over multiple pages.
Implementation Method 1
conductive additive having a volume resistivity in the range of about E−6 to E6 ohm-cm, which may be present at a concentration in the toner composition to provide a mass flow of about 0.2 to 1.5 mg/cm2
Data Source
AI summary
The present invention relates to controlling the mass flow of toner in an image forming device or a toner cartridge. The toner composition includes extra particulate additives including a conductive additive. The extra particulate additives may also include relatively small silica particles or relatively large silica.