Two-Part Closure Ribs Constrain Hot-Fill Liner Expansion
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Solution Overview
Problem
Hot-fill containers face issues with liner seals breaking due to expansion and cooling, leading to potential bacterial growth from retained moisture, which can result in unsanitary conditions when the contents cool and the liner is sprayed during the cooling process.
Innovation Solution
A two-part closure system with a plate-like upper portion that clips onto a lower part with sidewalls and interior threads, featuring ribs positioned above the liner to maintain the seal during expansion and allow moisture to be blown away, preventing bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the liner is allowed to expand freely during hot-fill, then the liner can accommodate the thermal expansion of contents, but the seal about the container mouth breaks
Solution Approach 1:
The closure structure provides different functional zones: the lower closure part with downward facing sealing lip provides local constraint at the seal location, while the upper open portion allows expansion in other areas. The rib structure creates localized support points that guide controlled expansion while maintaining seal integrity at the critical mouth interface.
Solution Approach 2:
The downward facing sealing lip and rib structure are positioned in advance to counteract the upward expansion force of the liner during hot-fill. This preliminary constraint prevents the seal from breaking before the expansion occurs, maintaining seal integrity throughout the thermal process.
2Temperature
If the container is sprayed with water during cooling, then the cooling efficiency is improved, but water is retained on the liner surface
Solution Approach 1:
The open upper portion of the lower closure part creates a three-dimensional space above the liner that allows water to drain away in the vertical dimension, rather than being trapped on the two-dimensional liner surface. This dimensional space enables gravity-driven water removal while maintaining the cooling spray function.
Solution Approach 2:
The rib structure and open configuration extract the harmful element (retained water) from the system by providing drainage pathways, separating the water removal function from the sealing function. This allows the liner to maintain its seal while water is actively removed from the container interior.
3Stability of the object's composition
If the liner is constrained to prevent seal breaking, then seal integrity is maintained, but moisture cannot be removed after cooling
Solution Approach 1:
The closure system is segmented into multiple functional components: the lower closure part with sealing lip for seal integrity, the rib structure for controlled constraint, and the open upper portion for moisture removal. This segmentation allows each component to perform its specific function without interfering with others, simultaneously achieving seal maintenance and moisture removal.
Solution Approach 2:
The rib structure acts as an intermediary element between the liner and the open space above. It provides controlled constraint to maintain seal integrity while simultaneously creating pathways for moisture removal, mediating between the conflicting requirements of seal stability and moisture evacuation.
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 maintains the liner seal during hot-fill expansion and allows for moisture removal, preventing bacterial growth and ensuring a clean container opening experience.
Implementation Method 1
the liner may be pulled inwardly sufficiently to break the seal about the mouth sealing surface... the rib serves to limit the travel of the liner upward as it expands after the hot-fill of a product
Implementation Method 2
when the contents cool, the volume of any gas in the container is reduced... when the container is sprayed as a part of the cooling process
Data Source
AI summary
A two-part closure for use in conjunction with a liner. An upper part of the closure is substantially plate like and clips or snaps onto the lower part of the closure. The lowest part of the closure has sidewalls with interior threads or a snap-on rib, as desired. The upper portion of the lower part is open, with crossing ribs positioned a spaced distance above the sealing lip for the lower part.