Viscous Material Transfer With Addressable Resistive Heating
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Solution Overview
Problem
Existing methods for transferring high viscosity functional materials, such as conductive or insulating pastes, face challenges in achieving precise deposition with uniformity and minimal deformation due to shear forces, especially on substrates with height variations, leading to non-uniform print qualities and morphological changes.
Innovation Solution
A transfer method using a plate with individually addressable resistive heater elements that control heat distribution and gas generation at the interface between the donor and receiving substrates, allowing for precise and controlled deposition by adjusting the power magnitude over time, and employing heating cycles to minimize shear forces and adapt to substrate morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photonic printing with transparent transfer plate and pulsed light is used to transfer high viscosity functional material, then material release is achieved through gas generation, but non-uniform release occurs due to shadow effects in closely packed high aspect ratio cavities
Solution Approach 1:
The patent replaces the optical heating system (flashlamp) with a resistive heating system. The transfer plate contains a resistive heating element that directly heats the functional material in the cavities through electrical resistance, eliminating the shadow effects that plague optical systems. This mechanical/electrical substitution ensures uniform heating and material release across all cavities regardless of their geometry or packing density.
Solution Approach 2:
The resistive heating element acts as an intermediary between the power source and the functional material. Instead of using light as the intermediary (which suffers from shadow effects), the patent introduces an electrical heating element that is in direct thermal contact with the material, providing uniform energy transfer throughout the cavity structure.
2Manufacturing precision
If high heat flux (40 kW/cm2) is applied in microseconds to transfer small feature sizes without overheating the ink, then transfer precision is improved, but unrealistic operation conditions are required for flashlamps
Solution Approach 1:
The patent replaces the flashlamp-based optical heating system with an electrical resistive heating system. The resistive heating element can be controlled to deliver the required high heat flux (40 kW/cm2) in microseconds without the operational limitations of flashlamps. This substitution makes the high-precision transfer process industrially feasible by eliminating the unrealistic operational conditions required by optical systems.
Solution Approach 2:
The patent changes the heating mechanism from optical (flashlamp) to electrical (resistive heating), which allows for precise control of heat flux parameters. The electrical system can deliver the required 40 kW/cm2 in microseconds with much greater ease and reliability than flashlamps, making the process parameterically feasible for industrial applications.
3Productivity
If photonic printing method is used for global transfer of structures, then material transfer is achieved, but selective pattern formation is not possible since light is not selective
Solution Approach 1:
The patent segments the heating function into individually addressable resistive heating elements corresponding to different cavities or cavity groups. This segmentation allows selective activation of specific heating zones to transfer only desired patterns, while maintaining the capability for global transfer when all elements are activated simultaneously. The resistive heating elements can be independently controlled based on the required pattern.
Solution Approach 2:
The patent introduces dynamic control capability where the resistive heating elements can be selectively activated or deactivated based on the required pattern. This dynamic control allows the system to adapt between global transfer mode (all elements active) and selective pattern formation mode (specific elements active), providing versatility without sacrificing productivity.
4Length of stationary object
If laser beam scanning is used to heat cavities exceeding laser spot dimensions, then material transfer over full cavity length is achieved, but scanning movement is required which increases process complexity
Solution Approach 1:
The patent segments the heating function into multiple stationary resistive heating elements distributed along the cavity length. Each heating element can independently heat its corresponding cavity region without requiring scanning movement. This segmentation eliminates the need for complex scanning mechanisms while achieving full cavity coverage through parallel stationary heating zones.
Solution Approach 2:
The patent replaces the mechanical scanning system (required for laser beam coverage) with stationary resistive heating elements. The electrical heating system naturally provides omnidirectional or uniformly distributed heating from each element, eliminating the need for scanning movement and significantly reducing device complexity while maintaining full cavity length coverage.
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
Enables precise and uniform deposition of high viscosity materials on substrates with complex topographies, reducing morphological changes and ensuring accurate transfer of features even over large distances.
Implementation Method 1
individually addressable resistive heater elements that control heat distribution and gas generation at the interface
Implementation Method 2
heating the material in the at least one donor area by supplying a plurality of individually addressable heater elements with an electric power having a respective time dependent magnitude, to generate a gas at an interface between the donor surface in the donor area and the material, to force the material from the at least one donor area by the gas generation onto the receiving substrate
Data Source
AI summary
A method and device are described to transfer a viscous functional material onto a receiving substrate. A plate is provided having a cavity surface that includes a cavity. A plurality of individually addressable resistive heater elements are provided that are in thermal contact with respective zones of the cavity. Viscous functional material is provided in the cavity with a material composition that, when sufficiently heated, generates a gas at an interface between the cavity surface in the cavity and the functional material, to transfer the functional material from the cavity by the gas generation onto the receiving substrate. Respective portions of the viscous functional material in respective zones of the cavity are heated by supplying respective ones of the plurality of individually addressable heater elements with an electric power having a respective time dependent magnitude.