Vented Fitment for Flexible Pouch with ePTFE Membrane
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Solution Overview
Problem
Flexible pouch containers face challenges in venting gas-emitting products without wetting out the venting membrane, especially during transport and storage, as existing solutions struggle to keep the membrane dry when the product sloshes around.
Innovation Solution
A vented insert assembly with a carrier and a liquid-impermeable membrane, such as expanded polytetrafluoroethylene (ePTFE) with a polyethylene backing, is positioned outside the product to allow gas passage while preventing liquid from escaping, and can be easily attached to existing fitments to ensure correct orientation and prevent membrane wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vented membrane is used in a flexible pouch to allow gas emission, then the pouch can vent gas effectively, but the membrane may wet out when product sloshes around during transport and storage
Solution Approach 1:
The patent introduces a hydrophobic barrier layer as an intermediary between the vented membrane and the liquid product. This barrier layer acts as a mediator that allows gas molecules to pass through while blocking liquid molecules, preventing the membrane from wetting out. The barrier layer is positioned between the product and the membrane, creating a protective interface that selectively permits gas transmission while repelling liquid.
Solution Approach 2:
The patent applies different properties to different parts of the venting system. The vented membrane itself remains porous to allow gas passage, while a separate hydrophobic barrier layer is applied specifically at the interface where liquid contact occurs. This local differentiation of properties - porous membrane for gas ventilation combined with hydrophobic coating for liquid rejection - resolves the contradiction by giving each component its specialized function.
2Ease of operation
If a check ball inside an angled channel is used to control gas escape, then the venting mechanism can be controlled, but it becomes difficult to keep the membrane dry in a flexible package
Solution Approach 1:
The hydrophobic barrier layer serves as an intermediary that protects the membrane from direct contact with sloshing product. Even when the check ball mechanism allows gas flow control, the barrier layer remains in place between the liquid product and the membrane, preventing wetting during transport and storage when the package is moved.
3Reliability
If the vented membrane is positioned inside the pouch to vent gas, then gas can be emitted from the pouch, but liquid product may come into contact with and wet the membrane
Solution Approach 1:
The hydrophobic barrier layer is positioned between the liquid product and the vented membrane, acting as an intermediary protective layer. This barrier allows gas molecules to pass through to the membrane for venting while blocking liquid product from contacting the membrane, thereby preventing wetting and maintaining membrane functionality.
Solution Approach 2:
The vented membrane utilizes porous material structure that allows gas molecules to pass through while the hydrophobic barrier layer prevents liquid penetration. The porous nature of the membrane combined with the hydrophobic properties of the barrier creates a selective permeability system that vents gas while repelling liquid.
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 vents gas from the pouch without allowing liquid to escape, maintaining the membrane's dryness and ensuring the product's containment, even during transport and handling, thus addressing the limitations of previous venting systems.
Implementation Method 1
A membrane can be attached to the carrier such that the membrane blocks an area substantially equal to the area within the inner wall of the carrier. The membrane comprises a liquid impermeable material
Implementation Method 2
The membrane may be an expanded polytetrafluoroethylene (ePTFE) with or without a polyethylene backing
Data Source
AI summary
An insert assembly for a fitment used with a pouch containing a liquid product producing an off-gas is provided. The assembly includes a vented insert for use with the vented fitment allowing the off-gas to pass there through. A carrier is configured to be attached to the vented insert and includes a liquid impermeable membrane attach to the carrier and fluid coupled to the fitment and insert to allow gas from the product to pass there through. The membrane, which can comprise an EPTFE material allows the gas to pass through, while preventing the liquid product from passing through a wall of the pouch. The insert assembly can be selectively opened and closed to allow or prevent the off-gas produced by the product to pass through the assembly as needed to reduce the pressure within the pouch or container.