Battery Packaging Material With Roughened Protective Layer
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Solution Overview
Problem
Existing battery packaging materials face issues with adhesive residues after protective tape peeling, which can damage the surface and affect appearance, and existing solutions do not effectively address this problem for all types of packaging materials, especially those without a colored carbon black layer.
Innovation Solution
A battery packaging material with a substrate protective layer containing wax, resin beads, and inorganic fine particles, along with a specific surface roughness, ensures that the protective tape can be peeled off without leaving adhesive residues, while maintaining adhesive strength when required, by creating a surface with mixed areas of high and low adhesive contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the protective tape firmly adheres to the packaging material, then the adhesive strength is improved, but adhesive residues remain on the packaging material after peeling
Solution Approach 1:
The substrate protective layer is designed with non-uniform surface properties through the incorporation of solid fine particles (wax, resin beads, inorganic fine particles) that create local variations in surface energy and roughness. This results in regions with different adhesive contact characteristics, allowing the protective tape to adhere strongly in some areas while easily peeling in others, thereby preventing adhesive residues.
Solution Approach 2:
The invention changes the surface parameters of the substrate protective layer by controlling the gross value (1% to 5%) and composition of solid fine particles. This parameter modification creates an optimal balance between adhesive strength during production and ease of peeling without residues, resolving the contradiction between strong adhesion and clean removal.
2Ease of operation
If the protective tape is peeled off after production, then the packaging material surface is exposed, but adhesive residues damage the appearance
Solution Approach 1:
The non-uniform surface structure created by solid fine particles provides local variations in adhesive contact, enabling the protective tape to be peeled off easily without leaving residues that would damage the appearance. The mixed areas of high and low adhesive contact allow for clean removal while maintaining surface integrity.
Solution Approach 2:
The invention converts the potential harm of adhesive residues into a benefit by designing a surface that promotes complete adhesive removal. The specific surface composition and gross value control the adhesive interaction, transforming the peeling process from a potentially damaging operation into a clean removal that preserves appearance.
3Ease of manufacture
If inorganic and/or organic solid fine particles are dispersed in the substrate protective layer to improve moldability, then surface slipperiness is improved, but the surface gross value increases beyond optimal range
Solution Approach 1:
The invention precisely controls the surface gross value parameter within the optimal range of 1% to 5% by adjusting the types, amounts, and particle size distribution of solid fine particles. This parameter optimization ensures both improved moldability through surface slipperiness and prevention of excessive gross value that would compromise appearance or adhesive properties.
Solution Approach 2:
The substrate protective layer is designed as a composite material containing a binder resin and multiple types of solid fine particles (wax, resin beads, inorganic fine particles) in specific proportions. This composite structure achieves the dual objective of improving moldability through slipperiness while maintaining surface gross value within the optimal 1% to 5% range.
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 material achieves easy peeling of the protective tape without adhesive residues, maintaining adhesive strength and improving surface appearance by controlling the surface roughness and composition of the substrate protective layer.
Implementation Method 1
the surface gross value of the substrate protective layer is set to 1 to 15%... slipperiness by the surface unevenness effect is imparted
Implementation Method 2
a battery packaging material comprising... a substrate protective layer as an outermost layer arranged on an outer side of the substrate layer, wherein the substrate protective layer includes a binder resin and solid fine particles
Data Source
Figure 1
Figure 2
AI summary
In a battery packaging material provided with a substrate protective layer to improve moldability, conflicting characteristics that a protective tape is not unexpectedly peeled and can be peeled without remaining adhesive residues are imparted. The battery packaging material includes a substrate layer 13, a heat-fusible resin layer 15, a barrier layer 11 arranged between the substrate layer 13 and the heat-fusible resin layer 15, and a substrate protective layer 20 as an outermost layer arranged on an outer side of the substrate layer. The substrate protective layer 20 includes a binder resin 21, wax as solid fine particles 22, resin beads, and inorganic fine particles, and a gross value of the surface of the substrate protective layer 20 is 1% and 5%.