Spray Nozzle Flow Calibration for Uniform Conformal Coating
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Solution Overview
Problem
Current systems for applying liquid coating materials to substrates, such as circuit boards, face challenges in achieving uniform and controlled coatings with sharp edges and preventing material stringing, while ensuring adequate coverage and precise application of the desired amount of material.
Innovation Solution
A method and system that calibrate the flow rate of a coating system by setting and adjusting operating pressures based on a target flow rate and pressure-flow relationship, using a spray nozzle to apply conformal coatings uniformly and accurately, with real-time adjustments to maintain consistency across production cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating systems are used to apply liquid coating materials, then coating application can be achieved, but uniformity and control of coating thickness and material flow are insufficient
Solution Approach 1:
The system dynamically adjusts operating parameters including pressure, flow rate, and nozzle-to-substrate distance to maintain consistent coating quality. Flow sensors provide real-time feedback that enables continuous parameter optimization, ensuring uniform coating thickness and preventing defects like stringing while maintaining sharp edges.
2Productivity
If material flow rate is increased to improve coverage speed, then productivity increases, but coating uniformity and edge sharpness deteriorate
Solution Approach 1:
Flow sensors provide real-time feedback on material flow rate, enabling the system to dynamically adjust operating parameters to maintain optimal coating quality. This closed-loop control ensures that productivity increases do not compromise coating uniformity, edge sharpness, or prevent material stringing.
3Quantity of substance
If operating pressure is increased to maintain flow rate, then material delivery is improved, but coating precision and material control worsen
Solution Approach 1:
The system dynamically adjusts operating pressure based on real-time flow rate measurements and feedback, rather than maintaining constant high pressure. This enables precise material delivery control while maintaining coating precision and preventing material stringing, resolving the trade-off between quantity delivery and application precision.
4Ease of manufacture
If flow rate calibration is not performed, then system operation is simpler, but coating quality and material consistency deteriorate
Solution Approach 1:
The system performs automated flow rate calibration and continuous self-monitoring using integrated flow sensors, eliminating the need for manual calibration procedures. This maintains ease of operation while ensuring consistent coating quality through automatic parameter optimization and real-time feedback control.
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 system ensures precise and uniform application of liquid coatings with sharp edges and controlled material flow, maintaining consistency across multiple production cycles, thereby improving the quality and reliability of the coating process.
Implementation Method 1
calculating a first operating pressure of the coating system based upon the target flow rate for the material through the spray nozzle and a pressure-flow relationship between operating pressure of the coating system and flow rate of the material through the spray nozzle
Data Source
AI summary
Systems and methods for applying a liquid coating to a substrate are disclosed herein. One exemplary method includes calibrating flow rate of a material through a coating system. A target flow rate for the material through a spray nozzle is received, a first operating pressure of the coating system based upon the target flow rate is calculated, and the material is ejected onto a least part of a surface with the material flowing through the spray nozzle at the first operating pressure of the coating system. Subsequent to a comparison between an operating flow rate and the target flow rate, the operating pressure is adjusted to a second operating pressure and at least part of the substrate is sprayed with the material flowing through the spray nozzle at the second operating pressure of the coating system.