Polyester Film Crystallinity Selection for Monomaterial Packaging
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Solution Overview
Problem
Existing multilayer bodies using PET films as base films face challenges in achieving both excellent filling suitability and strength, particularly when attempting to realize monomaterialization with a polyester film as the sealant layer.
Innovation Solution
A method for selecting a polyester film for use as a sealant layer in a multilayer body, involving FT-IR analysis to determine the crystallinity of the film, which is then used to select films with specific crystallinity ranges (2-15% and 10% or more) to ensure optimal filling suitability and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polyester film is used as a sealant layer to realize monomaterialization, then environmental sustainability is improved, but filling suitability and strength become insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the crystallinity of the polyester film within the range of 10-40% to simultaneously achieve monomaterialization and sufficient mechanical properties. This parameter optimization allows the film to maintain both environmental sustainability and adequate strength for packaging applications
2Strength
If various different materials are combined to improve performance, then filling suitability and strength are improved, but separate collection and recycling efficiency deteriorate
Solution Approach 1:
The patent applies homogeneity by using a single polyester material for both the base film and sealant layer, eliminating material complexity. This monomaterial structure maintains adequate performance while dramatically improving recyclability and collection efficiency, as the entire packaging can be processed as one material type
3Adaptability or versatility
If a polyester film is used as a sealant layer, then monomaterialization is achieved, but the strength of the packaging material becomes insufficient
Solution Approach 1:
The patent resolves this contradiction by changing the crystallinity parameter of the polyester film to the optimal range of 10-40%. This parameter adjustment enables the monomaterial polyester structure to achieve both versatility for recycling and sufficient strength for packaging applications
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 proposed method enables the production of multilayer bodies with enhanced filling suitability and strength, even when primarily using polyester films, thereby supporting the goal of monomaterialization while maintaining effective packaging performance.
Implementation Method 1
performing FT-IR analysis on reference polyester films by a reflection method, and measuring the crystallinity of a polyester film of interest
Data Source
AI summary
The present disclosure relates to a method for selecting a polyester film in which the polyester film is used as a sealant layer in a multilayer body including a base material layer including a crystalline polyester film, an adhesive layer and a sealant layer in this order, the method including:a step in which FT-IR analysis is performed on the polyester film by a reflection method, and the crystallinity of the polyester film is measured by the following formula; anda step in which a first polyester film having a crystallinity of 2 to 15% is selected:I1409=p1×I1340+p2×I1370 (Formula 1)Crystallinity [%]=p1×(I1340/I1409)×100 (Formula 2).