Polymeric Closure with Channels for Retort Recyclability
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Solution Overview
Problem
Traditional polymeric closures for high-temperature applications, such as retort processes, face issues with chemical bonding between the closure and container, leading to difficulties in removal and environmental concerns due to non-recyclable designs.
Innovation Solution
A polymeric closure comprising a top wall portion, annular skirt portion, and disc with internal thread formations and channels, along with an internal prying projection to facilitate easy separation and a tamper-evident band for indicating access, enhancing the recyclability and usability in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chemical bonding between polymeric surfaces is used to create a robust seal in high-temperature applications, then seal strength is improved, but closure removal difficulty increases
Solution Approach 1:
The closure system is divided into three separate components: a closure body, a liner, and a disc. This segmentation allows the seal to be formed by the liner against the container while the closure body can be removed independently, resolving the contradiction between strong sealing and easy removal.
Solution Approach 2:
The liner acts as an intermediary element between the closure body and the container. It forms the chemical bond with the container to ensure strong sealing, while the closure body interacts with the liner through mechanical engagement, allowing removal without breaking the seal.
2Ease of operation
If a three-piece system with metal disc and plastisol liner is used to enable easy separation, then closure removal is improved, but manufacturing cost increases
Solution Approach 1:
Multiple functions are merged into a single polymeric closure body: sealing, threading, and structural support. This eliminates the need for separate metal discs and plastisol liners, reducing manufacturing complexity and cost while maintaining easy removal capabilities.
Solution Approach 2:
The entire closure system uses homogeneous polymeric materials instead of composite metal-plastic constructions. This simplifies manufacturing processes, reduces the number of assembly steps, and lowers overall production costs while maintaining the desired functionality.
3Ease of operation
If traditional three-piece closure design is used to enable easy separation, then closure removal is improved, but recyclability worsens
Solution Approach 1:
Using homogeneous polymeric materials throughout the closure system makes it compatible with recycling streams for plastic containers. The uniform material composition allows for easier processing and recycling compared to composite metal-plastic assemblies.
Solution Approach 2:
The closure is designed as a complete removable unit that can be easily separated from the container for recycling purposes. The polymeric construction allows both the closure and container to be processed through appropriate recycling channels, improving overall material recovery rates.
Data Source
AI summary
A closure comprises a polymeric top wall portion, a polymeric annular skirt portion, a polymeric liner and a polymeric disc. The polymeric annular skirt portion depends from the polymeric top wall portion. The annular skirt portion includes an internal thread formation for mating engagement with an external thread formation of a container. The polymeric disc has an exterior surface. The polymeric disc is located between the polymeric top wall portion and the polymeric liner. The polymeric disc includes a plurality of channels formed therein. The plurality of channels assists in allowing liquid to travel on the exterior surface of the polymeric disc and between the polymeric annular skirt portion and an external finish of a container.