Sealable Packaging with Micro-Perforated Fold for Venting
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Solution Overview
Problem
Existing product packaging is inadequate in preventing contamination from ambient contaminants during heating processes, such as gluten particles in baking or allergens in food preparation, and for sterilizing non-food items like medical equipment.
Innovation Solution
A sealable enclosure with a micro-perforation portion in a fold of film layer that allows generated gases to vent out while preventing ambient contaminants from entering, using a heat-sensitive adhesive that releases at a threshold temperature to open the fold and facilitate gas venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the packaging is completely sealed to prevent contaminant entry, then contamination protection is improved, but gas generated during heating cannot escape causing pressure buildup
Solution Approach 1:
The packaging incorporates a micro-perforation portion that acts as a porous structure, allowing selective passage of gases while blocking larger contaminant particles. The micro-perforations enable controlled venting of internal pressure without compromising the barrier function against external contaminants.
Solution Approach 2:
The micro-perforation portion serves as an intermediary element between the sealed interior and external environment. It mediates the conflicting requirements by allowing gas molecules to pass through while blocking larger contaminant particles, thus resolving the contradiction between pressure relief and contamination protection.
2Stress or pressure
If the packaging includes vent openings to release gas, then pressure relief is improved, but ambient contaminants can enter the package
Solution Approach 1:
The micro-perforation portion functions as a porous material with孔径 (pore size) specifically designed to allow gas molecules to pass through while blocking larger contaminant particles. This selective permeability enables pressure relief without contaminant entry.
Solution Approach 2:
The packaging structure exhibits local quality differentiation where the micro-perforation portion has specific permeability properties distinct from the rest of the sealed packaging. This localized functional differentiation allows the package to maintain overall seal integrity while providing targeted gas venting capability.
3Object-affected harmful factors
If the fold is sealed with heat-sensitive adhesive to maintain seal integrity, then contamination protection is improved, but gas venting is prevented until adhesive releases
Solution Approach 1:
The heat-sensitive adhesive's bonding strength changes in response to temperature parameter changes. At lower temperatures, the adhesive maintains strong bonding to preserve seal integrity. When temperature exceeds the threshold, the adhesive's bonding strength decreases, allowing the fold to open and gas to vent through the micro-perforation portion.
Solution Approach 2:
The micro-perforation portion is pre-positioned in the fold structure before heating occurs. When the adhesive releases due to temperature increase, the fold automatically opens to reveal the pre-positioned micro-perforation, enabling immediate gas venting without requiring additional mechanical intervention.
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
Effectively prevents contamination of packaged products during heating by allowing generated gases to escape while keeping ambient contaminants out, ensuring the product remains uncontaminated throughout the heating process.
Implementation Method 1
When the temperature of the strip of heat sensitive adhesive reaches a threshold temperature, the strip of heat sensitive adhesive releases so that fold opens
Data Source
AI summary
A sealable enclosure is disclosed that is configured to enclose an object that is to be heated, wherein heating of the sealable enclosure with the object sealed therein permits gas generated by the heating to vent out through a first micro-perforation portion disposed in a fold of film layer. Initially, the generated gas is retained in the sealable enclosure. When the temperature of the strip of heat sensitive adhesive reaches a threshold temperature, the strip of heat sensitive adhesive releases so that fold opens, wherein the gas vents through the micro-perforation portion disposed in the film layer out into an ambient region surrounding the sealable enclosure while preventing ambient contaminates in the ambient region from entering into the sealable enclosure.