Wide Slit Nozzle for Overlapping Damping Coating
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Solution Overview
Problem
Conventional nozzles used for coating vibration damping materials on vehicle floors result in irregularities and interference with components due to the thickness increase of overlapped material, leading to reduced vibration damping ability when spaces are minimized.
Innovation Solution
A wide slit nozzle with a thickness parallel to the coating direction and a width perpendicular to it, featuring a fixed thickness at the center and decreasing thickness at the lateral ends, allowing for overlapping without significant thickness increase, ensuring a flat surface and maintaining vibration damping effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coating materials are coated with their edges overlapped to eliminate spaces, then the vibration damping ability is improved, but the overlapped part rises much higher causing interference with components
Solution Approach 1:
The slit thickness varies locally along its length - thinner at the ends and thicker at the center portion. This local variation in geometry allows the coating material to be discharged with different thicknesses at different positions, making the overlapped portion thickness comparable to the non-overlapped portion thickness, thereby preventing interference with components while maintaining continuous coating for vibration damping
Solution Approach 2:
The physical parameter of the slit (thickness) is changed along its length rather than being uniform. By making the slit thinner at the ends and thicker at the center, the discharge characteristics of the coating material change correspondingly, enabling the overlapped portions to have controlled thickness that matches the non-overlapped portions, thus resolving the contradiction between continuous coverage and surface profile
2Shape
If spaces are set between coated lines to prevent interference, then the surface flatness is improved, but the vibration damping ability degrades
Solution Approach 1:
The slit geometry is designed with local quality variation - the thickness changes from thinner at the ends to thicker at the center. This ensures that when coating lines are overlapped, the discharged material thickness at the overlap region is reduced to match the non-overlapped regions, achieving surface flatness without requiring spaces between lines, thereby maintaining continuous coverage and vibration damping effectiveness
3Ease of manufacture
If the slit thickness is uniform, then the manufacturing is simplified, but the overlapped portion thickness becomes much larger than non-overlapped portion
Solution Approach 1:
Rather than maintaining uniform slit thickness for manufacturing simplicity, the invention applies local quality variation by making the slit thinner at the ends and thicker at the center. This geometric variation directly controls the discharge thickness of the coating material, ensuring that overlapped portions have appropriate thickness to match non-overlapped portions, thereby achieving the desired thickness distribution despite increased manufacturing complexity
Data Source
AI summary
A wide slit nozzle having a slit as a discharge opening. The thickness of a lateral end part is set smaller than the thickness at a lateral center part. The thickness of the lateral center part is fixed. The thickness of the lateral end part changes linearly from opposite lateral ends of the lateral center part to the opposite lateral ends of the slit. Coating material is discharged from the slit while applied with pressure, so that the coating material is coated while expanded wider than the width of the slit. The coating material is discharged at 7 liter per minute, and a coating width of a first example is 100 mm, for example. A thickness increase of the overlapped part is +25% even when a width or an overlapped margin z of the overlapped part is 10 mm or 20 mm.