Coating Nozzle Arc Outlet Port for Consistent Paint Width
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Solution Overview
Problem
Conventional slit coating nozzles for high viscosity paint applications face challenges in maintaining a consistent coat pattern width due to variations in discharge quantity, coating distance, and paint temperature, leading to difficulties in achieving precise control and even application on uneven or curved surfaces.
Innovation Solution
A coating nozzle design featuring a slit passage with an arc-shaped outlet port and a wider expansion passage, where the curvature radius of the slit outlet port is related to its chord length in a specific ratio (70-130%), preventing paint spread and ensuring a fixed coat pattern width independent of discharge quantity, coating distance, and paint temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slit coating nozzles are used with small opening to provide predetermined shear rate, then the paint pressure increases, but the coat pattern width greatly varies in accordance with discharge quantity, coating distance, and paint temperature
Solution Approach 1:
The patent changes the geometric parameters of the slit outlet port from conventional small opening to a larger arc-shaped opening with specific curvature radius R and chord length Lt, where Lt/R×100 is 70-130%. This parameter change allows the paint to discharge with reduced pressure while maintaining predetermined shear rate, and the coat pattern width becomes independent of discharge quantity, coating distance, and paint temperature variations
Solution Approach 2:
The patent applies curvature by designing the slit outlet port with an arc shape instead of a straight line. The arc-shaped outlet port with curvature radius R creates a specific flow pattern that prevents paint spread, while the chord length Lt of the arc determines the discharge width. This curvature design is key to achieving stable coat pattern width regardless of operating conditions
2Productivity
If discharge quantity is increased to widen coat pattern width, then the coating efficiency improves, but the coat pattern width becomes highly dependent on pressure variations
Solution Approach 1:
The patent changes the discharge parameters by using a larger arc-shaped outlet port that allows high discharge quantity while maintaining stable coat pattern width. The specific geometric parameters (curvature radius R and chord length Lt with Lt/R×100=70-130%) ensure that the paint discharge characteristics remain consistent across different discharge quantities, enabling both high productivity and precision
3Manufacturing precision
If conventional nozzle design is used, then the system requires precise control of discharge quantity, coating distance, and paint temperature, but this increases device complexity and robot control requirements
Solution Approach 1:
The patent changes the nozzle geometry parameters to create a system that is inherently insensitive to variations in discharge quantity, coating distance, and paint temperature. The arc-shaped outlet port with Lt/R×100=70-130% creates a self-regulating discharge pattern that maintains consistent coat width, thereby eliminating the need for complex control systems and reducing device complexity
Data Source
AI summary
A coating nozzle 10 contains an introduction passage 21, an expansion passage 22 and a slit passage23. The introduction passage 21 introduces high viscosity paint P and the slit passage 23 discharges it. The expansion passage 22 communicating with the introduction passage 21 has a wider space than the introduction passage 21 and substantially sectored-trapezoidal shape. The slit passage 23 is a slit opening communicating with the bottom of the expansion passage 22. The slit passage 23 includes a slit inlet port 23b on the bottom of the expansion passage 22 and a slit outlet port 23a with an arc shape on the other side of the inlet port 23b. This slit passage 23 has Lt/R×100=70-130% wherein the curvature radius of the arc of the outlet port 23a is R and the chord length Lt of the arc of the outlet port 23a is Lt.