Self-Dispensing Carbonated Container Valve and Headspace Pressure Control
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Solution Overview
Problem
Conventional thin-walled beverage cans with carbonated products face challenges in maintaining pressure equilibrium and efficient dispensing, especially at varying temperatures, which can lead to can failure and difficulty in dispensing the correct quantity of concentrated products.
Innovation Solution
A self-dispensing container design with a valve that allows CO2 from the carbonated product to fill the headspace, maintaining pressure and enabling the product to be dispensed through a valve driven by internal pressure, with a higher carbonation level and specific headspace volume to ensure efficient dispensing and can stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thin-walled beverage cans are used with standard carbonation levels, then mass production at high speeds is achieved, but the cans fail due to base reverse or end peak at high temperatures and cannot dispense complete product at low temperatures
Solution Approach 1:
The patent increases the carbonation level from conventional 2-3 vols to 3-4 vols, which fundamentally changes the pressure dynamics within the can. This parameter change ensures sufficient dispensing pressure even at low temperatures while the controlled headspace volume (10-30%) prevents excessive pressure buildup at high temperatures, resolving the contradiction between reliability and productivity.
Solution Approach 2:
The patent pre-configures the can with a specific headspace volume (10-30% of total volume) before sealing, which allows the CO2 to expand into this predetermined space during temperature variations. This preliminary action prevents base reverse and end peak failures while ensuring complete dispensing, addressing both reliability and productivity concerns.
2Productivity
If a valve is added to enable self-dispensing, then complete product dispensing is achieved, but the device complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the valve automatically opens when the can is tilted or inverted, allowing the carbonated product to flow out using its own internal pressure. The valve closes automatically when the can is returned to upright position. This self-service approach achieves complete dispensing efficiency without requiring complex external control mechanisms, balancing productivity and device complexity.
Solution Approach 2:
The patent utilizes the pneumatic pressure of CO2 gas in the headspace to drive the liquid product through the valve and out of the dispensing orifice. This hydraulic-pneumatic mechanism enables automatic dispensing without mechanical pumps or complex actuation systems, maintaining simplicity while achieving high dispensing efficiency.
3Productivity
If higher carbonation level (3-4 vols) is used to ensure complete dispensing, then dispensing pressure is sufficient at low temperatures, but the can may fail due to base reverse or end peak at high temperatures
Solution Approach 1:
The patent optimizes the headspace volume parameter to 10-30% of the total can volume, which acts as a pressure buffer. This parameter change allows the system to tolerate higher carbonation levels (3-4 vols) for sufficient dispensing pressure at low temperatures, while the headspace prevents excessive pressure buildup that would cause base reverse or end peak failures at high temperatures, thus resolving the contradiction between productivity and reliability.
4Ease of operation
If the valve inlet is positioned to allow self-dispensing, then ease of operation is improved, but the risk of accidental activation increases
Solution Approach 1:
The patent employs a dynamic valve mechanism that responds to the orientation of the can. The valve remains closed in the upright position and automatically opens only when the can is tilted or inverted beyond a certain angle, allowing the product to flow out. This dynamic behavior provides ease of operation through simple tilting action while preventing accidental activation during normal handling, balancing convenience and safety.
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 solution ensures complete dispensing of the product at various temperatures, maintains can rigidity, and facilitates easy quantity visualization through carbonated foam, addressing the challenges of can stability and dispensing efficiency.
Implementation Method 1
CO2 in the product comes out of solution filling the headspace (the volume of the container not filled with product) with CO2 gas to equalise the pressure within the sealed container
Implementation Method 2
the pressure of the gas in the headspace drives dispensing of the product through the open valve
Implementation Method 3
more CO2 to come out of solution from the product and replenish the headspace with CO2
Implementation Method 4
the final in-can pressure will be less than 5 psi (0.034 MPa), but it is still a positive pressure and all the contents will be ejected
Data Source
AI summary
A self-dispensing container of carbonated product comprising a hollow body having a filling aperture, a carbonated product inserted into the hollow body via the filling aperture, leaving a headspace, and a lid adapted to seal the filling aperture after insertion of the carbonated product wherein, after sealing, the headspace fills with CO2 from the carbonated product to equalise the pressure within the container. The container further includes a valve having open and closed positions, wherein the valve communicates between a valve inlet on the inside of the container and a dispensing orifice on the outside of the container, and in use the container is orientated so that the valve inlet is submerged in the carbonated product and when the valve is in its open position, the CO2 in the headspace dispenses the carbonated product through the dispensing orifice.