Handheld Aerosol Dispenser for Two-Part Adhesive Mixing
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Solution Overview
Problem
Existing hand-held dispensing devices for fast-setting two-component adhesives face issues with clogging due to rapid viscosity increase, premature mixing, and the need for tethered gas connections, making them unsuitable for intermittent use and limiting operator mobility.
Innovation Solution
A self-contained, hand-held spray dispensing device with separate liquid discharge lines and a pressurized fluid system that aerosolizes the liquids only at the outlet, preventing premature mixing and clogging, and allowing for efficient, uninterrupted dispensing of well-mixed adhesive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a static mixer is used to mix adhesive components in a serpentine passage, then the components are mixed before exiting the passage, but the mixed components increase in viscosity rapidly when flow is interrupted, causing the mixer passage to become clogged
Solution Approach 1:
The device divides the adhesive components into separate containers and keeps them separated throughout the dispensing system until the moment of application. Each component has its own dedicated passage, preventing premature mixing and eliminating the clogging problem that occurs when mixed adhesive sits in a static mixer passage.
Solution Approach 2:
A gas stream acts as an intermediary carrier that transports each liquid component through separate passages to the application site. The gas entrains the liquids and delivers them without requiring the components to be mixed within the dispensing device itself, avoiding the gelling and clogging issues of static mixers.
2Ease of operation
If hand-held mixing devices entrain liquid components in a gas stream, then the device is portable and self-contained, but the liquid deposits appear as segregated clumps that are not well mixed
Solution Approach 1:
The device maintains separate discharge lines for each liquid component, with each line entrained in its own gas stream. This segmentation prevents the segregated clumping problem while maintaining portability, as the components remain separate until the final mixing point at the application site.
Solution Approach 2:
The gas streams continuously entrain and transport the liquid components through separate passages without interruption. This continuous flow prevents the viscosity increase and gelling that occurs with intermittent flow, ensuring smooth delivery of well-mixed adhesive.
3Reliability
If a tethered connection to a fluid source is used to supply gas for mixing, then the gas can be supplied continuously, but the operator's mobility is limited and ease of handling is reduced
Solution Approach 1:
The gas source is extracted from an external tethered supply and integrated into a self-contained cartridge within the hand-held device. This eliminates the tethered connection and its associated mobility limitations while maintaining continuous gas supply for liquid entrainment and aerosolization.
Solution Approach 2:
The device is made self-contained with an onboard gas cartridge that supplies the necessary gas for aerosolizing the adhesive components. This self-service capability eliminates the need for external gas supplies or tethered connections, fully resolving the mobility limitation while ensuring reliable gas supply.
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 device ensures effective, uninterrupted dispensing of well-mixed adhesive components without clogging, enhancing usability and operator mobility by eliminating the need for a tethered gas connection.
Implementation Method 1
a pressurized gas stream into said discharge lines, the velocity of said pressurized gas stream being able to act to aerosolize any liquid material emanating from the outlet ends of said discharge lines
Data Source
AI summary
A self-contained, hand-held spray dispensing device includes an internal source of pressurized fluid that exerts a motive force on a pair of liquid ejecting elements to cause each to eject a liquid into a discharge line. The liquids remain separated until each exits its discharge port. A pressurized fluid is directed over the outlet ends of the discharge line beginning before a flow interrupter in the discharge line is opened to permit flow therethrough and ceasing after liquid flow is terminated. The pressurized fluid flow over the outlet of the discharge line aerosolizes liquids emanating from the outlet ends. The liquid ejecting element is connected to a force transmitting yoke. The yoke responds to pressurized fluid from the source to generate the motive force on the ejecting element.