Conductive Trace Printing on Plastic Panels
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Solution Overview
Problem
Plastic glazing panels in vehicles face challenges with heat dissipation and electrical conductivity due to lower thermal and electrical conductivity compared to glass, affecting defroster efficiency and requiring improved methods for printing consistent and effective heater grid lines.
Innovation Solution
An apparatus with a support bed, articulatable arm, dispensing nozzle, flow regulator, and height sensor, controlled by a controller to regulate ink flow and nozzle height, ensuring precise printing of conductive grid lines on plastic substrates, accommodating panel curvature and varying surface contours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a heater grid is printed on plastic window, then weight reduction and design flexibility are achieved, but defroster efficiency deteriorates due to lower thermal conductivity of plastic compared to glass
Solution Approach 1:
The patent applies local quality by varying the grid line dimensions (width, height, spacing) in different regions of the heater grid to compensate for the lower thermal conductivity of plastic. By adjusting the local geometry of conductive traces, the system optimizes heat distribution across the plastic window surface, ensuring adequate defrosting performance while maintaining the weight advantages of plastic over glass.
2Adaptability or versatility
If metallic paste is cured on plastic panel at low temperature, then compatibility with plastic glass transition temperature is achieved, but electrical conductivity deteriorates due to dielectric layer between metallic particles
Solution Approach 1:
The patent employs parameter changes by modifying the physical dimensions of the conductive traces (increasing width, height, or reducing spacing) to compensate for the reduced electrical conductivity caused by the dielectric layer. By adjusting these geometric parameters, the system maintains adequate electrical conductivity for heater operation while preserving the low-cure-temperature compatibility required for plastic substrate processing.
3Ease of manufacture
If conventional dispensing method is used for printing heater grid, then manufacturing simplicity is maintained, but manufacturing precision deteriorates due to inability to control grid line width and height consistency
Solution Approach 1:
The patent applies dynamics by implementing a programmable dispensing system that dynamically adjusts dispensing parameters (flow rate, nozzle-to-substrate distance, travel speed) during the printing process. This enables precise control over grid line width and height consistency while maintaining ease of manufacture through software-controlled automation rather than complex mechanical fixtures.
4Manufacturing precision
If heater grid lines have varying width and height, then manufacturing tolerance is relaxed, but defroster performance deteriorates due to unequal resistances in grid sections
Solution Approach 1:
The patent implements feedback by using a programmable controller that monitors and adjusts dispensing parameters in real-time based on predetermined specifications for grid line width and height. This closed-loop control ensures consistent dimensional accuracy of heater grid lines, which directly translates to uniform resistance distribution and equitable heating across the defroster system.
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 consistent and precise printing of heater grid lines with controlled width and height, enhancing defroster efficiency and aesthetic quality by adjusting ink flow and nozzle height dynamically, addressing the limitations of existing technologies in plastic window applications.
Implementation Method 1
The sensor is preferably a triangulation sensor, such as a laser triangulation sensor
Implementation Method 2
The curing of the metallic paste provides a conductive polymer matrix having closely spaced metallic particles dispersed throughout a dielectric layer
Implementation Method 3
the quality of the printed heater grid and these parameters include any variances in the width, height and straightness of the grid lines... resulting in unequal resistive heating in various sections of the defroster
Data Source
AI summary
An apparatus for printing a conductive ink onto a plastic panel including an articulatable arm having an end that opposes a surface of the panel. A nozzle is mounted via a nozzle height actuator to the end of the arm, and the nozzle is coupled to a source of conductive ink. A flow regulator, coupled to the ink source, regulates the flow rate of ink out of the nozzle and is controlled by the controller. A height sensor is configured to output a height signal relative to the surface and the controller, which is coupled to the arm, the flow regulator, the nozzle height actuator and the sensor, is configured to control the arm, flow regulator, nozzle height actuator, and speed of nozzle movement such that a conductive trace of predetermined height and width is applied to the substrate.