Composite Encapsulation System for Vacuum Insulation Hermetic Sealing
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Solution Overview
Problem
Existing insulation structures for appliances face challenges in maintaining a hermetic seal within vacuum insulation cavities due to permeability issues with oxygen and water vapor, which can compromise the insulation's effectiveness.
Innovation Solution
A composite encapsulation system comprising a base elastic adhesive, such as polyurethane or silicone-based adhesives, and an outer barrier coating, like polyvinylidene chloride or aluminum coatings, is used to create a structural adhesive and sealing connection between the outer wrapper, inner liner, and trim breaker, reducing permeability through the application of a two-part encapsulation system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer adhesive seal is used in the vacuum insulation structure, then the manufacturing process is simple, but the seal exhibits high permeability to oxygen and water vapor
Solution Approach 1:
The patent applies composite materials by combining an elastic adhesive base layer with a barrier coating layer to create a multi-layer encapsulation system. The adhesive base provides structural bonding while the barrier coating provides impermeability to oxygen and water vapor, resolving the contradiction between manufacturing simplicity and hermetic seal performance.
Solution Approach 2:
The sealing system is segmented into two distinct functional layers: an elastic adhesive base layer for structural bonding and a barrier coating layer for impermeability. This segmentation allows each layer to optimize its specific function while working together to achieve both ease of manufacture and high reliability sealing.
2Strength
If a rigid sealing material is used to ensure structural strength, then the seal maintains its shape well, but it cannot accommodate movement or deformation of the insulation cavity
Solution Approach 1:
The patent applies local quality by giving different parts of the sealing system different properties: the adhesive base layer is formulated to be elastic and flexible to accommodate movement, while the barrier coating layer provides the necessary impermeability. Each layer performs its specific function locally, resolving the contradiction between structural strength and flexibility.
Solution Approach 2:
The composite structure combines materials with complementary properties: an elastic adhesive base for flexibility and movement accommodation, and a barrier coating for impermeability and structural integrity. This composite approach allows the seal to maintain strength while adapting to cavity deformation.
3Reliability
If a multi-layer encapsulation system with barrier coating is applied, then oxygen and water vapor transmission is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The patent merges the sealing function and barrier function into an integrated encapsulation system where the barrier coating is applied directly over the adhesive base layer. This combining of functions into a unified multi-layer system achieves high hermetic performance while managing manufacturing complexity through systematic integration.
4Adaptability or versatility
If the adhesive base is made highly elastic to accommodate movement, then the seal remains flexible, but the permeability to oxygen and water vapor increases
Solution Approach 1:
The patent resolves this contradiction by creating a composite encapsulation system where the elastic adhesive base layer provides flexibility and movement accommodation, while the barrier coating layer provides impermeability to oxygen and water vapor. The composite structure allows both properties to coexist by assigning them to different layers.
Solution Approach 2:
The sealing system is segmented into functional layers: the elastic adhesive base layer handles flexibility requirements, while the barrier coating layer handles impermeability requirements. This functional segmentation allows each layer to optimize its specific property without compromising the other.
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 significantly reduces oxygen and water vapor transmission rates, ensuring a robust and flexible seal that maintains the vacuum integrity and insulating capability of the appliance, even under movement or deformation.
Implementation Method 1
a base elastic adhesive and an outer barrier coating define a structural adhesive that hermetically seals an insulation cavity
Implementation Method 2
significantly reduces oxygen and water vapor transmission rates
Data Source
AI summary
An appliance includes an outer wrapper, an inner liner, a trim breaker having a channel that receives at least one of a wrapper edge of the outer wrapper and a liner edge of the inner liner and a composite encapsulation system including a base elastic adhesive and an outer barrier coating. The base elastic adhesive and the outer barrier coating define a structural adhesive that hermetically seals an insulation cavity defined between the outer wrapper and the inner liner.