Print-Improving Resin Layer for Battery Packaging Ink Stability
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Solution Overview
Problem
Ink printed on the outer surface of battery packaging materials blurs or peels off when exposed to harsh environments, such as high temperatures and high humidity, or during shape-forming and heat sealing processes.
Innovation Solution
A shape-forming packaging material comprising a heat-resistant resin layer, a heat-fusible resin layer, and a metal foil layer, with a print-improving resin layer laminated on the outer side of the heat-resistant resin layer, containing resins like epoxy, urethane, or acrylic resins, and a lubricant applied to the outer surface to prevent ink blurring and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If printing is performed directly on the outer resin layer of battery packaging material, then the printing process is simple, but the ink blurs in harsh environments and during shape-forming or heat sealing
Solution Approach 1:
The patent divides the packaging material into multiple functional layers: an outer resin layer for shape-forming, a heat-resistant resin layer that prevents ink blurring during heating, and a print-improving resin layer that prevents ink peeling. This segmentation allows each layer to specialize in one function, resolving the contradiction between simple printing and reliable print quality.
Solution Approach 2:
The patent uses a composite multi-layer structure combining different resin materials with specific properties. The outer resin layer provides formability, the heat-resistant layer (with glass transition temperature of 50°C or higher) prevents thermal blurring, and the print-improving layer enhances adhesion. This composite approach enables simultaneous achievement of simple printing and reliable print quality.
2Device complexity
If printing is performed on the outer resin layer, then the structure is simple, but the print portion peels off due to contact with solvents
Solution Approach 1:
The patent separates the adhesion function from the outer resin layer by introducing a dedicated print-improving resin layer. This layer contains resins selected for their excellent adhesion properties and resistance to solvent-induced peeling, while the outer resin layer maintains its shape-forming capability. The segmentation resolves the contradiction between structural simplicity and print adhesion reliability.
Solution Approach 2:
The print-improving resin layer acts as an intermediary between the ink and the packaging material structure. It provides a surface with optimized adhesion properties that prevents ink peeling during solvent contact, while remaining compatible with the overall multi-layer structure. This intermediary layer resolves the adhesion problem without requiring complete structural redesign.
3Ease of operation
If the packaging material undergoes shape-forming or heat sealing, then the packaging functionality is achieved, but the ink blurs due to heat and moisture
Solution Approach 1:
The patent applies preliminary protective action by laminating the heat-resistant resin layer (with glass transition temperature of 50°C or higher) and print-improving resin layer onto the outer resin layer before printing and subsequent processing. These layers are pre-positioned to prevent ink blurring during upcoming shape-forming and heat sealing operations, resolving the contradiction between operational ease and prevention of harmful effects.
Solution Approach 2:
The patent converts the harmful heat and moisture conditions into beneficial effects by using the heat-resistant resin layer's high glass transition temperature to withstand the heat sealing process without deforming, and the print-improving layer's solvent resistance to prevent ink blurring during moisture exposure. The harmful environmental factors become test conditions that validate the protective layers' effectiveness.
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 prevents ink blurring and peeling during shaping, heat sealing, and exposure to harsh environments, ensuring stable print quality and material integrity.
Implementation Method 1
heat sealing
Implementation Method 2
heat fusible resin layer
Implementation Method 3
the ink at the print portion does not blur even at the time of shape-forming or heat sealing or even if it is used in a somewhat harsh environment, such as, e.g., a high temperature environment and a high humidity environment
Data Source
AI summary
The shape-forming packaging material is a shape-forming packaging material including a heat resistant resin layer as an outer layer, a heat fusible resin layer as an inner layer, and a metal foil layer disposed between both the layers, and is configured such that a print improving resin layer is laminated on a further outer side of the heat resistant resin layer.