Modified Riser Tube Openings for Consistent Aerosol Spray

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Solution Overview

Problem

Pressure cans experience a deterioration in spray pattern over time due to the formation of droplets and agglomerates, especially when the fill level is low, requiring prolonged mechanical agitation, leading to incomplete utilization and increased waste.

Innovation Solution

A pressure can design with a riser tube that includes an additional opening or incision to enlarge the cross-section, allowing for improved spray agent dispensing without the need for extensive mechanical mixing, ensuring a consistent spray pattern and complete emptying.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the fill level in the can decreases over time, then the spray pattern quality deteriorates due to droplet and agglomerate formation, but reducing mechanical agitation to avoid waste increases the heterogeneity of the aerosol

Engineering Contradiction:

Improvespray pattern quality consistencyVSAvoidaerosol homogeneity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The riser tube is divided into multiple functional sections: a first section extending from the valve to a first level, and a second section extending from the first level to a second level. This segmentation allows different zones of the can to be accessed at different fill levels, ensuring consistent spray quality throughout the can's usage life without requiring intensive mechanical agitation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The riser tube is pre-positioned with its openings at specific levels within the can before use. This preliminary arrangement ensures that as the fill level decreases, the riser tube automatically accesses progressively lower portions of the spray agent, maintaining aerosol homogeneity without requiring user intervention or mechanical agitation.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If prolonged mechanical agitation is required to maintain spray quality at low fill levels, then spray pattern consistency is maintained, but the can contents cannot be completely utilized and waste increases

Engineering Contradiction:

Improvespray pattern consistencyVSAvoidunused can contents

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The riser tube's segmented structure with openings at different levels enables complete utilization of the can contents. As the fill level decreases, the riser tube progressively accesses lower portions of the spray agent, allowing nearly complete emptying of the can while maintaining spray quality without requiring prolonged mechanical agitation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The riser tube design enables the system to self-regulate spray quality maintenance. Instead of requiring user action (mechanical agitation), the riser tube's fixed geometry and multi-level openings automatically adapt to the decreasing fill level, maintaining aerosol homogeneity and enabling complete can utilization without waste.

Inventive Principle:

Principle #25Self-service

3Loss of substance

If the riser tube extends deeper into the container to access lower fill levels, then complete emptying is enabled, but the spray pattern quality deteriorates due to gradient formation

Engineering Contradiction:

Improvecan contents utilizationVSAvoidspray pattern quality

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The riser tube is segmented into a first section and a second section with openings at different levels. This segmentation allows the tube to access lower fill levels for complete emptying while the strategic placement of openings prevents exposure to the gradient-rich lower zones, thereby maintaining spray pattern quality throughout the can's usage life.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the riser tube are positioned to access different zones of the can with different qualities. The openings are strategically located to access regions with acceptable aerosol homogeneity while avoiding the gradient-prone lower central area, enabling complete utilization without sacrificing spray quality.

Inventive Principle:

Principle #3Local quality

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 design enables more efficient and complete utilization of the can contents, maintaining a high-quality spray pattern over time, with up to 10% more spray agent dispensed and improved consistency in spray rate.

Implementation Method 1

The riser tube has an opening cross-section on the container side which is enlarged by the at least one additional opening

Methodology Applied

Scientific EffectFluid flow through enlarged opening cross-section:

Data Source

PatentUS20250388386A1Pressure can with modified riser tube

Publication Date: 2025.12.25 PETER KWASNY GMBH

AI summary

A pressure can for dispensing a spray agent may include a container having a container wall and a domed container bottom for receiving the spray agent, a valve for discharging the spray agent when the valve is actuated, and a riser pipe extending from the valve towards the container base and having a lateral surface. A valve-side riser pipe opening may be connected to the valve and arranged on a first end face, and a container-side riser pipe opening open towards the container and arranged on a second end face. The riser pipe may be arranged to conduct the spraying agent from the container-side riser pipe opening to the valve-side riser pipe opening. The riser pipe may extend from the valve closer to the container base than to a container center point.