Spray Nozzle Rectangular Orifice Uniform Flow Distribution
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Solution Overview
Problem
Current spray coating methods for cylindrical containers, such as metal cans, often result in uneven coating distribution and excessive overspray, leading to inefficiencies in material usage and waste, particularly when coating complex surfaces with ribs or contoured profiles.
Innovation Solution
The development of spray nozzle designs with rectangular shape cut spray orifices that produce spray patterns with uniform or even flow distribution, reducing tailings and feathering, and allowing for controlled coating of cylindrical surfaces with minimized overspray by creating distinct edges and adjustable flow patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional symmetrical spray patterns with maximum flow in the middle are used, then coating coverage is improved, but material loss through overspray increases
Solution Approach 1:
The spray pattern is designed with non-uniform flow distribution where different regions have different flow characteristics. The pattern concentrates coating material in specific areas that require adequate coverage while reducing or eliminating flow in areas that would result in overspray, such as near the can body exterior edges. This localized control of material distribution resolves the contradiction between achieving adequate coverage and minimizing material loss.
2Manufacturing precision
If coating material is increased to assure adequate coverage of critical areas, then coating thickness is improved, but total weight and cost increase
Solution Approach 1:
The spray pattern directs coating material preferentially to critical surface areas that require adequate thickness and coverage, while reducing or eliminating material application to non-critical areas. This selective distribution ensures that the minimum required coating thickness is achieved in critical zones without unnecessarily increasing the total coating weight, thereby resolving the contradiction between coating quality and material quantity.
3Quantity of substance
If spray patterns are adjusted to coat complex surfaces with ribs or contours, then coating coverage is improved, but overspray outside the container increases
Solution Approach 1:
The spray pattern is specifically designed to accommodate complex surface geometries such as ribs and contours by concentrating flow in areas that require coating coverage while reducing flow in areas that would lead to overspray outside the container. This localized flow control enables adequate coating of complex surfaces without proportionally increasing material loss.
4Quantity of substance
If multiple spray nozzles are used to coat interior surfaces, then coating coverage is improved, but device complexity increases
Solution Approach 1:
The spray system is divided into multiple nozzles, each producing a specific spray pattern oriented to cover particular interior surface areas of the container. This segmentation allows comprehensive coverage of complex geometries while maintaining control over material distribution. Each nozzle can be optimized for its specific coverage zone, and the collective arrangement achieves complete coverage without requiring excessive material application from any single source.
Data Source
AI summary
A spray nozzle is disclosed that produces a flat spray pattern for liquid coating material, the spray pattern having a generally uniform flow distribution of quantity of coating material across the spray pattern. The spray nozzle may include a rectangular cut spray orifice to produce such a spray pattern. The spray pattern may further have distinct edges so that the pattern exhibits substantially reduced tailings of coating material outside these edges. In one embodiment, the spray pattern produces a “rectangular” drip pattern. In another embodiment, the spray pattern may include a middle region having reduced flow of coating material as compared to side regions of the spray pattern.