Venting Closure for Container Pressure Management
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Solution Overview
Problem
Existing sealing technologies for containers, particularly in hot-fill and sterilization processes, fail to effectively manage internal pressures (vacuum or overpressure) without contaminating the contents, and often require specialized equipment for heat-sealing, which complicates recycling and increases costs.
Innovation Solution
A venting closure system featuring a non-porous shell with a gas-permeable porous venting medium that filters external air entering the container during cooling, preventing pressure buildup while allowing air to escape during heating, and transitioning to a hermetic seal without the need for external heat-sealing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a hermetic seal is applied during hot-fill and cooling processes, then product contamination is prevented, but internal vacuum pressure deforms the container and increases opening torque
Solution Approach 1:
The closure incorporates a dynamic venting mechanism that transitions from an open state during filling and cooling to a closed state during storage. The venting opening allows pressure equalization during critical phases, then seals hermetically to prevent contamination, adapting to different process stages.
Solution Approach 2:
The closure system changes its permeability parameter based on process requirements. During hot-fill and cooling, the closure maintains high permeability to allow air intake and prevent vacuum. After cooling, it transitions to low permeability for hermetic sealing, changing the physical state of the sealing interface.
2Object-affected harmful factors
If a hermetic seal is applied during sterilization processes, then product contamination is prevented, but internal overpressure deforms the container
Solution Approach 1:
The closure provides dynamic pressure regulation during sterilization. The venting opening remains open to allow overpressure release during heating, then closes hermetically during cooling to prevent contamination, adapting to thermal processing stages.
Solution Approach 2:
The venting opening acts as an intermediary pressure release mechanism during sterilization, allowing controlled air escape to prevent overpressure deformation while maintaining product integrity, then transitions to a hermetic barrier.
3Stress or pressure
If deformable structures are incorporated in the container wall to accommodate vacuum pressure, then container deformation is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the pressure management function from the container wall structure and relocates it to the closure component. Instead of modifying the container with deformable panels, the closure independently handles pressure equalization, simplifying the container design.
Solution Approach 2:
The closure system self-regulates internal pressure through its venting mechanism without requiring external intervention or complex container structures. The closure automatically intakes air during cooling and releases overpressure during sterilization based on internal pressure conditions.
4Reliability
If specialized heat-sealing equipment is used to create hermetic seals, then sealing reliability is improved, but recycling difficulty and equipment cost increase
Solution Approach 1:
The closure creates its own hermetic seal through the interaction between the sealing surface and the container opening without requiring external heat-sealing equipment. The seal forms naturally through compression and contact, eliminating the need for specialized sealing machinery.
Solution Approach 2:
The closure uses a simple, inexpensive sealing mechanism that can be easily manufactured and disposed of or recycled without specialized equipment. The sealing interface is designed for simplicity, using basic compression sealing rather than complex heat-welding systems.
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
This solution effectively manages internal pressures to prevent container deformation, reduces contamination risk, and facilitates easy recycling by eliminating the need for specialized heat-sealing equipment, while maintaining product integrity and reducing opening torque requirements.
Implementation Method 1
a porous venting medium (104) that is gas permeable and filters external air entering into the container through the closure during cooling
Implementation Method 2
a sealing element (103) positioned on the inner face of the top wall and adapted to hermetically seal the container opening when the closure is in the sealing position
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The venting closure (1A) is adapted for sealing a container, and in particular for avoiding pressures (vacuum pressures or overpressures) inside the container (C) that could deform the container. Said venting closure comprises a shell (10) defining a housing (102), a porous venting medium (104) positioned inside said housing (102) and a seal (103) positioned inside said housing (102), and said venting closure can be fitted onto a container (C) in at least two positions : a closing position, wherein air (A) coming from the outside of the container can enter into the container by passing necessarily through the said porous venting medium (104), or air coming from the inside of the container can escape outside the container by passing necessarily through the said porous venting medium (104 ), and a sealing position, wherein the seal (103) of the venting closure is hermetically sealing the container.