Spray Nozzle Geometry for Uniform Fan-Shaped Adhesive Coverage

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Solution Overview

Problem

Conventional spray nozzles for polyurethane foam adhesive applications in roofing result in raised adhesive beads that collect dust and water, leading to aesthetic issues and potential barrier breakdown, and require complex structures or external air assist for consistent spray patterns.

Innovation Solution

A spray nozzle with a cylindrical inlet space, circular restriction, and stadium-shaped nozzle orifice, featuring specific taper ratios and a two-piece design, allows for a homogeneous fan-shaped spray pattern without external air assist, ensuring efficient and consistent application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If conventional spray nozzles are used to spray polyurethane foam adhesive, then the adhesive can be applied to secure edges of waterproof membranes, but the adhesive forms raised beads that collect dust, debris, and pooling water, leading to aesthetic issues and potential barrier breakdown

Engineering Contradiction:

Improvespray patternVSAvoiddust collection, water pooling

Core Design Contradiction:

ShapeVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by modifying the nozzle geometry parameters - specifically the inlet space diameter (0.25-0.5 inches), restriction diameter (0.06-0.12 inches), and orifice diameter (0.03-0.06 inches) - to transform the spray pattern from raised beads to a flat, dispersed application that prevents water pooling and dust collection

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If conventional spray nozzles are used with complex structures or external air assist to achieve consistent spray patterns, then homogeneous coverage can be obtained, but the device complexity increases and requires additional support infrastructure that reduces speed and mobility

Engineering Contradiction:

Improvespray pattern consistencyVSAvoidexternal air assist, pump cart

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent implements self-service by designing a nozzle that generates consistent spray patterns through its own geometric features (inlet space, restriction, and orifice dimensions) without requiring external air assist or pump cart infrastructure, thereby maintaining mobility and speed while achieving homogeneous adhesive coverage

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The nozzle achieves stable spray patterns by optimizing geometric parameters - the inlet space diameter (0.25-0.5 inches), restriction diameter (0.06-0.12 inches), and orifice diameter (0.03-0.06 inches) - creating a pressure-regulating flow path that delivers consistent performance across varying operating conditions

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If conventional spray nozzles are used with complex structures, then spray pattern control can be improved, but manufacturing costs increase and the nozzle requires many uses to be economical

Engineering Contradiction:

Improvespray pattern consistencyVSAvoidmanufacturing cost

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent achieves consistent spray patterns through optimized geometric parameters (inlet space 0.25-0.5 inches, restriction 0.06-0.12 inches, orifice 0.03-0.06 inches) that can be manufactured using standard machining or molding processes, eliminating the need for complex internal passages or multiple components while maintaining performance

Inventive Principle:

Principle #35Parameter changes

4Stability of the object's composition

If the adhesive is sprayed to create uniform coverage with larger globules deposited onto the substrate, then homogenous coverage is achieved, but the spray nozzle requires precise pressure regulation during application

Engineering Contradiction:

Improveadhesive coverage homogeneityVSAvoidpressure regulation

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The nozzle's geometric parameters (inlet space diameter, restriction diameter, orifice diameter) are specifically designed to create a pressure-regulating flow path that delivers homogeneous adhesive coverage with consistent globule size across the pressure range of 50-250 PSI, eliminating the need for external pressure regulation equipment

Inventive Principle:

Principle #35Parameter changes

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 nozzle provides a uniform adhesive dispersion, reducing manufacturing costs and eliminating the need for external air assist, while achieving fast and efficient application with overlapping bands and consistent coverage.

Implementation Method 1

with a contour of an inner surface of the spray nozzle tapering down in size with a first taper from the inlet space to the restriction and then tapering out in shape with a second taper from the restriction to the nozzle orifice

Methodology Applied

Scientific EffectFluid flow through tapered contours:

Data Source

PatentUS20260027569A1Spray nozzle

Publication Date: 2026.01.29 MEDMIX SWITZERLAND AG

AI summary

A spray nozzle is basically provided with an inlet space, a restriction and a nozzle orifice. The inlet space has an essentially cylindrical shape. The restriction has an essentially circular shape, with a contour of an inner surface of the spray nozzle tapering down in size with a first taper from the inlet space to the restriction and then tapering out in shape with a second taper from the restriction to the nozzle orifice, with the nozzle orifice having a stadium shape.