Xerographic Conductive Trace Printing With Graphite Powder Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The print industry faces challenges in printing electrically conductive lines due to the high cost of silver-based inks and significant waste associated with conductive foils and thermal printers, with xerography being disadvantaged in bonding and transferring conductive materials.
Innovation Solution
A method using a xerographic machine to print a substrate with toner, followed by applying powdered graphite or graphene and bonding it with heat and pressure to create electrically conductive traces, allowing for low-cost production of printed conductive circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver-based ink is used for printing conductive lines, then electrical conductivity is achieved, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive silver-based conductive ink with a disposable, low-cost alternative: a transfer sheet containing conductive material in thermal transfer ribbons. The conductive material is transferred from the transfer sheet to the substrate through thermal printing, eliminating the need for costly silver ink while maintaining conductivity functionality.
Solution Approach 2:
The patent introduces a transfer sheet as an intermediary carrier that holds the conductive material in thermal transfer ribbons. This intermediary enables the transfer of conductive material from a reusable master template to multiple substrates, reducing the cost of direct silver ink application while ensuring consistent conductivity patterns.
2Reliability
If conductive foils or thermal printers with conductive rolls are used, then conductive lines are produced, but material waste increases significantly
Solution Approach 1:
The patent implements a system where the transfer sheet serves as a reusable master template that can be recovered and used multiple times. The conductive material is transferred from the transfer sheet to substrates in a controlled manner, allowing the transfer sheet to be reused for producing multiple conductive patterns, thereby reducing overall material waste compared to single-use conductive foils.
Solution Approach 2:
The patent uses the transfer sheet as a master template that can be copied onto multiple substrates through thermal transfer printing. This copying mechanism allows a single set of conductive patterns to be replicated across numerous substrates with minimal material waste, as the conductive material is precisely transferred only where needed rather than applying excess material as with conductive foils.
3Ease of operation
If xerography is used for conductive printing, then printing capability is maintained, but bonding and transferring of conductive materials becomes problematic
Solution Approach 1:
The patent changes the bonding mechanism from xerographic electrostatic adhesion to thermal bonding. By using thermal transfer printing, the conductive material is bonded to the substrate through heat and pressure, which is more reliable and controllable than attempting to bond conductive materials through xerographic processes. This parameter change resolves the bonding and transferring problems while maintaining printing capability.
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
This method enables the production of low-voltage conductive lines with resistance suitable for applications like LEDs, reducing waste and costs by using a xerographic process to bond powdered conductive materials directly to the printed toner, facilitating the creation of conductive traces on various substrates.
Implementation Method 1
bonding it with heat and pressure to create electrically conductive traces
Implementation Method 2
bonding it with heat and pressure to create electrically conductive traces
Data Source
AI summary
A method of producing an electrically conductive line, the method including providing a substrate, printing a first layer on the substrate, applying a powdered conductive material to the first layer, and bonding the powdered conductive material to the first layer.