Easy-Open Packaging Bag With Gas Barrier Flaw Protection
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Solution Overview
Problem
Existing packaging bags using biaxially oriented films face challenges in maintaining easy-open properties, particularly at varying temperatures, and the provision of opening induction flaws compromises gas barrier performance.
Innovation Solution
A packaging bag design with a molecular orientation angle of less than 49° for the outer layer film and an opening induction flaw in the intermediate layer, combined with a barrier ink covering the flaw in the barrier layer, ensures easy opening and maintains barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the molecular orientation angle of the biaxially oriented film is reduced to achieve easy-open properties, then the ease of opening is improved, but the film strength and barrier performance deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular orientation angle to a specific range (15° to 45°) that balances easy-open properties with film strength. This parameter optimization allows the film to be easily opened while maintaining sufficient strength and barrier performance, resolving the contradiction between ease of opening and film strength.
2Ease of operation
If an opening induction flaw is inserted to enable easy opening, then the ease of opening is improved, but the gas barrier performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a localized opening induction flaw with specific characteristics (depth of 1-5 mm, width of 0.1-1.0 mm) that enables easy opening at a specific location without compromising the overall gas barrier performance of the laminate film. The flaw is designed to be sufficient for opening initiation while maintaining integrity elsewhere.
Solution Approach 2:
The patent applies partial action by creating an opening induction flaw that extends only partially through the laminate thickness (1-5 mm depth in a multi-layer structure), which is sufficient to initiate opening but does not completely compromise the gas barrier function of the remaining intact layers.
3Strength
If the molecular orientation angle is increased to improve film strength, then the film strength is improved, but the easy-open properties deteriorate
Solution Approach 1:
The patent applies parameter changes by establishing an optimal molecular orientation angle range (15° to 45°) that simultaneously achieves both film strength and easy-open properties. This parameter optimization resolves the contradiction by finding the sweet spot where the film is strong enough for handling and barrier performance while remaining easy to open.
4Temperature
If the packaging bag is heated to high temperatures for retort food processing, then the food sterilization is achieved, but the delamination of the laminated film occurs
Solution Approach 1:
The patent applies composite materials by using a laminated film structure with specific layer combinations (including PET, AL, and other barrier layers) that are designed to maintain integrity at high temperatures. The composite structure with optimized adhesion between layers prevents delamination during retort processing while maintaining easy-open properties after cooling.
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 achieves easy-open properties across temperature changes and preserves gas barrier integrity, preventing delamination and maintaining pouch integrity during heating.
Implementation Method 1
a molecular orientation angle of the outer layer film is less than 49°
Implementation Method 2
an opening induction flaw in an intermediate layer film
Implementation Method 3
a barrier ink covering the opening induction flaw in the barrier layer
Implementation Method 4
a packaging bag which is sealed by heat sealing a laminated film
Data Source
AI summary
Provided is a packaging bag in which the difficulty of tearing caused by temperature rising is resolved. The easy to open packaging bag for sealing a laminated film by heat sealing, wherein the laminated film includes an inner layer film, an intermediate layer film having an opening induction flaw formed thereon, and an outer layer film including a biaxially oriented film, and wherein a molecular orientation angle of the outer layer film is less than 49°. Also provided are a laminated film and a pouch having easy to open properties while maintaining excellent barrier properties. The laminated film is obtained by laminating (a) an outer layer film, (b) a barrier layer having an opening induction flaw, and (c) an inner layer film, and has a barrier ink covering the opening induction flaw in the barrier layer.