Push-Button Dispensing Closure Piston Dynamics
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Solution Overview
Problem
Existing dispensing closures struggle to effectively manage the flow of viscous products, such as laundry care products, by failing to provide a reliable mechanism for controlled dispensing and recharging, especially when transitioning between open and closed positions.
Innovation Solution
A push-button dispensing closure with a movable piston and dosing chamber, where the piston is designed to change positions between sealing and dispensing, allowing for controlled flow through dispensing apertures, and incorporating a vent path for recharging, which can be made from resilient materials like thermoplastic elastomer (TPE) for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional dispensing closure is used, then the structure is simple, but it fails to provide reliable controlled dispensing and recharging for viscous products
Solution Approach 1:
The closure is divided into distinct functional components: a dosing chamber for product storage, a piston mechanism for controlled dispensing, and a vent path for recharging. This segmentation allows each component to perform its specific function reliably, with the piston acting as a movable seal to control product flow between the dosing chamber and dispensing passage.
Solution Approach 2:
The piston is designed as a movable component that transitions between different positions (sealed vs. open) to control product flow. This dynamic element enables reliable controlled dispensing by mechanically opening and closing the flow path between the dosing chamber and dispensing passage, while the resilient push-button provides dynamic actuation.
2Ease of operation
If the push-button is made from resilient material like TPE, then ease of operation is improved, but manufacturing precision becomes more challenging
Solution Approach 1:
The push-button is made from resilient material (thermoplastic elastomer or similar) that can be deformed during actuation. This material property change allows the button to flex and return to its original position, providing ease of operation while the molding process maintains sufficient geometric precision for functional performance.
3Productivity
If the piston moves between sealed and open positions, then controlled dispensing is achieved, but device complexity increases
Solution Approach 1:
The piston serves multiple functions simultaneously: it acts as a movable seal to control product flow, defines part of the dosing chamber volume, and works with the push-button to enable both dispensing and recharging operations. This multi-functionality reduces the need for separate components for each function.
Solution Approach 2:
The piston is positioned within the body and dosing chamber assembly, with the push-button mechanism nested around or connected to the piston. This nested arrangement allows the various components to occupy overlapping spatial volumes, reducing overall device complexity while maintaining the movable sealing function.
4Reliability
If a vent path is added for recharging, then reliability of product fill is improved, but device complexity increases
Solution Approach 1:
The vent path is pre-configured in the closure structure to allow air or gas to escape from the dosing chamber during product filling. This preliminary provision of a vent path ensures reliable product fill by preventing pressure buildup that would otherwise阻碍 the filling process, without requiring active control mechanisms.
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
Enables precise control over the dispensing and recharging of viscous products, ensuring consistent flow and preventing backflow, even with high viscosity ranges (4,000-6,000 cps at 0.05 s−1), improving user experience and product usage efficiency.
Implementation Method 1
at least part of the push-button is formed from a resilient material, for example a thermoplastic elastomer (TPE), and is deformed to move the closure between the open and closed positions
Data Source
AI summary
A push-button dispensing closure is provided and comprises a dispensing passage, a push button and a dosing chamber. The closure is movable between a first, closed position in which: the push button is released, the dosing chamber can fill with flowable product, and product cannot pass from the dosing chamber to the dispensing passage; and a second, open position in which: the push button is depressed such that product can flow from the dosing chamber through the dispensing passage and product cannot flow into the dosing chamber.