Polypropylene Capsule Base Design for Piercing Resistance
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Solution Overview
Problem
Single serve beverage containers made of polystyrene are prone to cracking and leakage during the piercing process, and their non-recyclable nature contributes to environmental concerns, while alternatives like polypropylene lack the necessary strength and rigidity.
Innovation Solution
A hollow capsule design featuring a double outer wall configuration with a rim and additional structural elements such as ribs and ridges, made from polypropylene or other rigid plastics, formed using a thermoforming process to enhance strength and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polystyrene is used to make the pod or capsule, then the pod or capsule has sufficient strength and rigidity to withstand the piercing process, but the pod or capsule is not easily recyclable and contributes to environmental concerns
Solution Approach 1:
The patent changes the material parameter from polystyrene to polypropylene, which has different mechanical properties (lower rigidity) but better environmental properties (recyclability). This material substitution resolves the contradiction by accepting the need for structural modifications to compensate for the reduced inherent strength of polypropylene compared to polystyrene.
2Object-affected harmful factors
If polypropylene is used to replace polystyrene, then the pod or capsule is more easily recyclable, but the pod or capsule is not as rigid and is more susceptible to being damaged during the piercing process
Solution Approach 1:
The base of the pod is segmented into multiple structural components including a first wall, second wall, third wall, and multiple ribs. This segmentation creates a complex load-distributing structure that compensates for the lower inherent rigidity of polypropylene material, allowing the pod to withstand piercing forces while maintaining recyclability.
Solution Approach 2:
The patent adds vertical dimensionality to the base structure by creating multiple walls extending upward from the base surface and ribs extending between them. This three-dimensional structural complexity provides enhanced strength and rigidity to polypropylene, which naturally has lower rigidity compared to polystyrene, thereby resolving the contradiction between material recyclability and structural strength.
3Quantity of substance
If the pod or capsule wall is made thinner to reduce material usage, then manufacturing cost is reduced, but the pod or capsule becomes more susceptible to cracking during the piercing process
Solution Approach 1:
The base structure is divided into multiple segments (first wall, second wall, third wall, and ribs) that distribute mechanical stresses across multiple load paths. This segmentation allows the use of thinner wall sections while maintaining overall structural reliability during the piercing process, as the segmented structure prevents crack propagation that would occur in a solid thin wall.
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 design effectively withstands the forces during the piercing process, preventing leakage and enabling easier recycling, thus addressing both functional and environmental issues.
Implementation Method 1
formed using a thermoforming process
Data Source
AI summary
A container including a side wall having a hollow interior, an outwardly extending flange positioned above an upper end of the side wall, a lower end of the side wall having a first wall positioned thereon, a second wall extending upwardly from the first wall into the hollow interior of the side wall, a third wall extending inwardly and downwardly from the second wall, and a base extending inwardly from the third wall. A method of thermoforming the beverage container using a thermoforming operation is also provided.