Multilayer Packaging Bag Structure for Moisture-Stable Oxygen Barrier
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Solution Overview
Problem
The existing packaging bags with water vapor barrier resin layers suffer from reduced oxygen barrier properties due to water vapor absorption, leading to potential oxidation of contents.
Innovation Solution
A packaging bag design with a structure that includes a sealant layer, an oxygen barrier layer sandwiched between two water vapor barrier layers, where the water vapor barrier layers are made of fluorine-based resins, effectively preventing moisture absorption and maintaining oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water vapor barrier resin layer is used to prevent water vapor penetration, then water vapor barrier properties are improved, but oxygen barrier properties deteriorate due to water vapor absorption
Solution Approach 1:
The water vapor barrier function is divided into two separate layers: a first water vapor barrier layer (outer) and a second water vapor barrier layer (inner). This segmentation allows each layer to handle different aspects of water vapor protection, preventing saturation and maintaining oxygen barrier properties of the EVOH layer.
Solution Approach 2:
The first water vapor barrier layer acts as an intermediary between the external environment and the EVOH oxygen barrier layer. It intercepts water vapor before it reaches the EVOH layer, preventing water vapor absorption and maintaining the oxygen barrier properties of the intermediate layer.
2Quantity of substance
If water vapor penetrates the packaging structure, then water vapor absorption by the resin layer increases, but oxygen barrier properties are reduced
Solution Approach 1:
The first water vapor barrier layer is positioned to perform preliminary action by blocking water vapor from reaching the EVOH oxygen barrier layer in the first place. This preventive measure stops water vapor absorption before it can compromise oxygen barrier properties.
Solution Approach 2:
The packaging structure uses a composite material system combining PVDC (first water vapor barrier layer), EVOH (oxygen barrier layer), and PP or ADH (second water vapor barrier layer). This composite structure leverages the complementary barrier properties of each material to simultaneously achieve both water vapor and oxygen barrier functions.
3Device complexity
If a single water vapor barrier layer is used, then the structure is simpler, but oxygen barrier properties deteriorate due to water vapor saturation
Solution Approach 1:
The water vapor barrier function is divided into two separate layers: a first water vapor barrier layer (outer) and a second water vapor barrier layer (inner). This segmentation allows each layer to handle different aspects of water vapor protection, preventing saturation and maintaining oxygen barrier properties of the EVOH layer.
Solution Approach 2:
Different layers are assigned specific functions: the first water vapor barrier layer (PVDC) handles external water vapor protection, while the second water vapor barrier layer (PP or ADH) provides internal protection. The EVOH layer focuses exclusively on oxygen barrier function. This local quality assignment optimizes overall performance.
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 design maintains low oxygen permeability, preserving the integrity of contents by preventing moisture absorption and oxidation, ensuring effective oxygen barrier properties throughout the use period.
Implementation Method 1
the water vapor barrier layers contain a fluorine-based resin
Implementation Method 2
an oxygen barrier layer sandwiched between two water vapor barrier layers
Data Source
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AI summary
A packaging bag of the present invention includes a bag body provided with: a bonded part that is obtained by layering laminates, each of which includes a sealant layer, an oxygen barrier layer, and two or more water vapor barrier layers laminated in that order, such that the sealant layer sides thereof face each other, and fusing the outer peripheral edges of both laminates together; and a storage chamber that is defined by the laminates and the bonded part, and that can be filled with contents, in which the oxygen barrier layer is provided so as to be sandwiched between the two water vapor barrier layers, and the water vapor barrier layers contain a fluorine-based resin.