Dispensing Closure Hinge Moisture Ingress Prevention
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Solution Overview
Problem
Existing fluid dispensing closures face issues with moisture ingress and product leakage, particularly due to the design of the hinge and seal mechanisms, which affect the functionality and usability of the closures.
Innovation Solution
A dispensing closure design featuring a base with a domed central portion, a concave channel surrounding the dispensing opening, and a flexible dispensing valve secured by a retaining ring, which directs moisture away from the hinge and enhances sealing, while the domed deck facilitates easy cleaning and visual aiming during product dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hinge mechanism is used to connect the lid to the base, then the closure allows repeated opening and closing operations, but moisture can ingress through the hinge area causing product leakage
Solution Approach 1:
The closure is divided into separate components (lid, base, hinge, grommet) that work together to solve the moisture problem while maintaining operability. The hinge is segmented into a hinge body and a separate grommet component that provides the sealing function.
Solution Approach 2:
A grommet is introduced as an intermediary component between the hinge and the closure walls. This grommet serves as a mediator that provides moisture protection while allowing the hinge to perform its opening and closing function. The grommet receives the hinge and provides the sealing barrier against moisture ingress.
2Ease of manufacture
If the deck is made flat, then manufacturing is simpler, but moisture collects on the deck and flows toward the hinge causing leakage
Solution Approach 1:
The deck is given a domed curvature instead of being flat. This curved surface causes condensation and moisture to naturally drain away from the hinge area toward the dispensing opening, preventing moisture accumulation and leakage while maintaining manufacturing feasibility through molding processes.
3Reliability
If the valve is secured with a complex retaining mechanism, then the valve retention is more secure, but assembly becomes more difficult and time-consuming
Solution Approach 1:
The retaining ring and the closure base are combined into a single integrated component. This merging eliminates the need for separate assembly steps for the retaining ring, allowing the valve to be secured through a single snap-fit action while maintaining secure retention. The retaining features are built into the base structure itself.
Solution Approach 2:
The valve and closure base are designed with complementary snap-fit features that allow the valve to secure itself to the base through a simple insertion motion. The valve's peripheral flange engages with the base's retaining features automatically, eliminating the need for additional fastening operations or complex assembly 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
The solution effectively prevents moisture ingress, reduces product leakage, and improves the usability and cleaning of the closure, while allowing for easy assembly and secure retention of the valve, enhancing the overall performance of the dispensing closure.
Implementation Method 1
The channel surface has a base that is angled with respect to the peripheral portion down and away from the raised wall. Any moisture that condenses or collects on the deck thus tends to flow around the central portion of the deck to the point diametrically spaced from the hinge.
Data Source
AI summary
A dispensing closure includes a base having a lid integrally connected to the base by a hinge. The base has a deck with a central portion, a dispensing opening in the in the central portion, and a peripheral portion surrounding the central portion. The peripheral portion includes a raised wall partially surrounding the central portion, and having a greatest height adjacent to the hinge and decreasing in height around the central portion. The wall has an inner surface that blends with the central portion of the deck to form a concave channel surrounding the central portion of the deck. The channel surface has a base that is angled with respect to the peripheral portion down and away from the raised wall.