Polyester Barrier Film Interface for Al2O3 Adhesion
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Solution Overview
Problem
Existing barrier films face challenges in achieving improved adhesion of vapor-deposited films to substrates, particularly with aluminum oxide films on plastic substrates.
Innovation Solution
A barrier film comprising a polyester substrate with a vapor-deposited aluminum oxide film, where the peak intensity of the elemental bond of CN at the interface between the substrate and the vapor-deposited film is optimized to be within specific intensity ratios relative to the elemental bond of Al2O3, and optionally includes a gas barrier coating film for enhanced adhesion and barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vapor-deposited aluminum oxide film is formed on a plastic substrate to provide barrier functions, then the barrier properties against oxygen and water vapor are improved, but the adhesion of the vapor-deposited film to the substrate deteriorates
Solution Approach 1:
The substrate surface is subjected to plasma treatment before vapor deposition to modify the surface properties and enhance adhesion. This preliminary action creates a more reactive surface that improves bonding between the substrate and the subsequently deposited aluminum oxide film, resolving the adhesion problem while maintaining barrier properties.
Solution Approach 2:
An intermediate layer or surface treatment is introduced between the plastic substrate and the vapor-deposited aluminum oxide film. The plasma-treated surface acts as an intermediary that facilitates stronger bonding, allowing the barrier film to adhere properly to the substrate without compromising the barrier function.
2Strength
If the substrate is subjected to plasma surface treatment before vapor deposition, then the adhesion of the vapor-deposited film is improved, but the manufacturing complexity increases
Solution Approach 1:
The plasma treatment step and vapor deposition process are combined into a single integrated manufacturing line, allowing both processes to occur in sequence without requiring separate equipment or complex handling. This merging reduces manufacturing complexity while maintaining the adhesion benefits of plasma treatment.
Solution Approach 2:
The manufacturing equipment is designed to perform multiple functions - both plasma treatment and vapor deposition - within a single system. This multi-functionality eliminates the need for separate processing lines and reduces overall manufacturing complexity while achieving improved adhesion.
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 optimized adhesion between the substrate and vapor-deposited film results in improved barrier properties for the laminate and packaging products, maintaining flexibility and resistance to bending and hot-water treatment.
Implementation Method 1
a vapor-deposited film containing aluminum oxide
Implementation Method 2
the substrate is subjected to surface treatment with, for example, plasma
Data Source
AI summary
[Object] To improve the adhesion of a vapor-deposited film to a substrate.[Solution] A barrier film includes a substrate containing polyester and a vapor-deposited film containing aluminum oxide. At least the elemental bond of Al2O3 and the elemental bond of CN are detected by etching the barrier film using time-of-flight secondary ion mass spectrometry from a side adjacent to the vapor-deposited film. The peak intensity of the peak of the elemental bond of CN detected at the interface between the substrate and the vapor-deposited film is 0.15 or more times the maximum intensity value of the elemental bond of Al2O3.