Coating Nozzle Slit Geometry for High-Viscosity Paint
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Solution Overview
Problem
Conventional coating nozzles for high-viscosity paints often result in unsatisfactory coated appearances due to shear velocity outside the optimal range, leading to undulating phenomena, quality issues, and increased material waste, while attempts to improve shear velocity can result in clogging or cracked patterns.
Innovation Solution
A coating nozzle with a nozzle slit formed as a substantially-sector-shaped trapezoid, featuring a slit angle less than 45 degrees and a radius ratio between 1.03 and 1.11, which controls the shear velocity within the range of 5,000 to 20,000 s^-1, ensuring smooth, flat, and thin-filmed coatings with proper patterned widths, and reduces the likelihood of clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional nozzle slit configurations are used, then the discharge rate can be maintained, but the shear velocity falls outside the optimal range causing undulating phenomena and unsatisfactory coated appearances
Solution Approach 1:
The patent applies parameter changes by optimizing the nozzle slit geometry parameters - specifically setting the slit angle between 30-60 degrees and the radius ratio between 1.03-1.11. These parameter adjustments control the shear velocity of high-viscosity paint to fall within the optimal range of 5,000-20,000 s^-1, eliminating undulating phenomena and achieving smooth, flat coated appearances while maintaining process stability
Solution Approach 2:
The patent implements dynamics by designing the nozzle slit with an arc-shaped outlet configuration where the radius ratio creates a controlled flow expansion. This dynamic geometry allows the paint flow to adaptively adjust its velocity distribution as it passes through the slit, ensuring optimal shear conditions are maintained across varying discharge rates without causing instability or undulation
2Manufacturing precision
If the nozzle slit geometry is modified to improve shear velocity control, then coated appearance quality improves, but the likelihood of clogging increases
Solution Approach 1:
The patent resolves this contradiction through careful parameter selection - the slit angle is optimized to 30-60 degrees (not too narrow to cause clogging, not too wide to reduce shear velocity) and the radius ratio is set to 1.03-1.11 (providing just enough flow expansion to control shear velocity while maintaining adequate opening to prevent foreign material entrapment). This balanced parameter configuration achieves both smooth coated appearances and reduced clogging risk
Solution Approach 2:
The patent applies asymmetry by configuring the nozzle slit with a specific arc-shaped outlet geometry where the radius ratio creates an asymmetric flow distribution. This asymmetric design allows the paint to experience controlled shear stress that improves appearance quality while the gradual expansion profile prevents sudden flow constriction that would trap foreign materials and cause clogging
3Productivity
If the discharge rate is increased to improve productivity, then more paint can be applied, but the shear velocity may fall outside the optimal range causing quality issues
Solution Approach 1:
The patent implements dynamics through the arc-shaped nozzle slit outlet with optimized radius ratio, which creates a flow expansion effect that adaptively maintains optimal shear velocity across a wide range of discharge rates. As discharge rate increases, the flow naturally adjusts its velocity distribution through the curved geometry, keeping shear velocity within the 5,000-20,000 s^-1 optimal range without requiring active control, thus maintaining quality at high productivity levels
4Manufacturing precision
If the slit opening is reduced to increase shear velocity, then coated appearance improves, but the nozzle becomes more prone to clogging
Solution Approach 1:
The patent resolves this contradiction by changing the geometric parameters from a simple narrow slit to an arc-shaped outlet with optimized radius ratio of 1.03-1.11. This parameter change allows the effective slit opening to remain adequate (reducing clogging risk) while the curved geometry creates flow expansion that increases shear velocity to optimal levels, achieving both improved appearance quality and reduced clogging susceptibility
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 novel nozzle design achieves smooth, flat, and thin-filmed coatings with proper patterned widths, while minimizing the risk of clogging and ensuring reliable pattern integrity, even at high discharge rates.
Implementation Method 1
the nozzle slit having a slit width that converges from the nozzle-slit outlet side to the nozzle-slit inlet side, and the arc-shaped nozzle-slit outlet exhibiting a radius ratio that is a value obtained by dividing a second radius by a first radius, and which is greater than 1
Data Source
AI summary
A coating nozzle for high-viscosity paint includes a nozzle slit. The nozzle slit exhibits a specific reduced slit angle, and includes a nozzle-slit outlet, and a nozzle-slit inlet. The nozzle-slit outlet is formed as a distinct substantially-arced shape elongating lopsidedly from the nozzle-slit inlet to the nozzle-slit outlet. The coating nozzle including the nozzle slit can optimize a shear velocity of high-viscosity paint for a discharge rate of the high-viscosity paint in a setting of the actual employment.