Dispensing Closure With Integral Membrane for Low-Force Opening
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Solution Overview
Problem
Existing dispensing closures with separable membranes create waste and are not recyclable, require high force to open, and are costly to manufacture, making them inefficient and environmentally unfriendly.
Innovation Solution
A dispensing closure with a frangible, non-separable membrane integrally molded with the closure body, featuring a push portion or piercing ribs to breach the membrane efficiently, allowing low-force opening and improved recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separable membrane is used to initially seal the discharge end, then tamper-evidency and hermetic seal are provided, but additional waste is created that must be discarded separately
Solution Approach 1:
The membrane is integrally molded with the closure body, merging two previously separate components (membrane and closure body) into a single unit. This eliminates the need for separate membrane disposal while maintaining the hermetic seal function, directly resolving the contradiction between seal integrity and waste generation.
2Ease of operation
If a pull tab or pull ring is used to separate the membrane, then user access is enabled, but the closure structure becomes more complex and costly to manufacture
Solution Approach 1:
The separate membrane removal mechanism (pull tab/ring) is extracted and replaced by direct integration of the membrane with the closure body. The membrane itself becomes the structural element that defines the sealed state, eliminating the need for additional separation components and simplifying the overall closure structure.
3Ease of operation
If a frangible connection or tear path is used to define the separation line, then membrane separation is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The closure transitions from a static sealed state to a dynamic opened state through integral membrane deformation. The membrane's frangible nature allows it to dynamically respond to user force, separating cleanly along predetermined stress concentration lines that are built into the integral structure during molding, reducing precision requirements compared to separate components.
4Ease of manufacture
If a non-separable membrane is used, then recyclability is improved, but the force required to open the closure increases
Solution Approach 1:
The membrane is designed with localized frangible zones that have different mechanical properties from the rest of the structure. These localized weak points concentrate the opening force in specific areas, allowing the membrane to separate cleanly with reduced overall force while maintaining the non-separable, recyclable nature of the closure.
Data Source
AI summary
A dispensing closure (40, 40A, 40B) includes a first body (54, 54A, 54B) for being located at an opening of a container (44, 44A, 44B) and having a first peripheral wall (56, 56A, 56B) and a membrane (60, 60A, 60B) that is integrally molded with the first peripheral wall (56, 56A, 56N) to initially occlude access to the interior of the container (44, 44A, 44B). The closure (40, 40A, 40B) includes a second body (55, 55A, 55B) for surrounding at least a portion of the first body (54, 55A, 55B) and defining a dispensing orifice (88, 88A, 88B). Either the first body (54, 54A, 54B) and/or the second body (55, 55A, 55B) includes means for accommodating engagement by a user to breach only a portion of the membrane (60, 60A, 60B) in a direction toward the interior of the container (44, 44A, 44B) to permit access to the interior of the container (44, 44A, 44B).