Hot-fill cross cap vents prevent moisture retention
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Solution Overview
Problem
Hot-fill containers face issues with seal integrity due to liner movement and moisture retention, leading to potential bacterial growth when contents cool, causing unsanitary conditions upon opening.
Innovation Solution
A two-part closure system with a plate-like upper portion and a lower portion featuring sidewalls with interior threads or snap-on ribs, along with optional vents, to maintain liner seal and allow moisture escape, preventing bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the container is hot-filled and then cooled, then the volume reduction creates inward flexing, but this causes the liner to be pulled inwardly and break the seal
Solution Approach 1:
The closure system employs a flexible liner that can expand and contract with temperature changes while maintaining seal integrity. The liner is designed to flex outward when hot contents eliminate contaminants and flex inward during cooling without breaking the seal, resolving the contradiction between seal reliability and position stability during thermal cycling.
Solution Approach 2:
The closure structure incorporates pre-positioned ribs and sealing surfaces that anticipate the liner's inward movement during cooling. These structural elements provide support and cushioning before the liner is pulled inward, preventing seal breakage by distributing the stress and maintaining contact pressure on the sealing surface throughout the thermal process.
2Temperature
If the container is sprayed with water for cooling, then cooling efficiency improves, but water is retained on top of the liner
Solution Approach 1:
The closure design incorporates drainage features and angled surfaces that actively remove retained water from the liner surface after cooling spray. The structure extracts the harmful water accumulation through gravity-assisted drainage paths and hydrophobic surface treatments, allowing cooling efficiency while eliminating water retention that would otherwise support bacterial growth.
3Reliability
If the container is sealed tightly to prevent contamination, then biological contaminants are eliminated, but moisture is trapped inside
Solution Approach 1:
The closure system incorporates porous or microporous materials in the liner or cap structure that allow controlled moisture transmission. These materials maintain tight sealing to prevent biological contaminants while permitting water vapor to escape during cooling, resolving the contradiction between contamination prevention and moisture trapping by enabling selective permeability.
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 closure system effectively maintains the seal of the liner during cooling and allows moisture to be blown away, preventing microbial and fungal growth, ensuring a clean and safe product opening experience.
Implementation Method 1
allows moisture to be blown away after the subsequent cooling step where the container may be sprayed with water
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 lower part of the closure includes recessed vents which allow air and/or moisture to escape from beneath 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.