Polyester-Polyethylene Laminate Adhesion Control
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Solution Overview
Problem
Existing food packaging laminates, particularly those with APET and PE layers, face challenges in achieving sufficient adhesion force to prevent seal failures during packaging and material separation for recycling, as the bonding force between APET and PE is not consistently high enough to ensure reliable separation of materials for waste collection.
Innovation Solution
A laminate comprising a polyester sheet thermally or adhesively laminated to a polyethylene film with an ethylene ester copolymer, achieving an adhesion force of 30-150 grams per 15mm, which includes specific layer constructions and materials like EVOH and ethylene vinyl acetate copolymers to enhance oxygen barrier properties and separation capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal lamination or adhesive lamination process is used to bond polyester sheet to polyethylene film, then adhesion force is improved, but material separation for recycling becomes difficult
Solution Approach 1:
The patent applies parameter changes by controlling the adhesion force to fall within a specific range (30-150 grams per 15mm as measured by ASTM F88). This quantitative parameter control allows the laminate to achieve sufficient bonding strength for packaging applications while remaining separable for recycling purposes. The ethylene ester copolymer composition and its specific properties are tuned to achieve this optimal adhesion range.
Solution Approach 2:
The patent employs local quality by using a multi-layer film structure where different layers serve different functions. The layer directly bonded to polyester contains ethylene ester copolymer for controlled adhesion, while other layers provide barrier properties and sealing capabilities. This localized functional differentiation allows the laminate to meet multiple requirements simultaneously - strong enough for packaging but separable for recycling.
2Reliability
If high adhesion force is achieved between APET and PE layers, then seal failures are prevented, but material separation for waste collection becomes difficult
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the adhesion force parameter within the range of 30-150 grams per 15mm. This parameter optimization ensures that the bond is strong enough to prevent seal failures during packaging and transportation, yet weak enough to allow easy separation for recycling. The ethylene ester copolymer composition is specifically selected to achieve this optimal adhesion range.
Solution Approach 2:
The patent uses composite material structure with ethylene ester copolymer as the key component in the film layer bonded to polyester. This composite approach combines the benefits of strong adhesion (preventing seal failures) with recyclability (enabling material separation). The specific copolymer composition provides both the necessary bonding strength and the controlled separability required.
3Object-affected harmful factors
If polyester sheet is laminated to polyethylene film for oxygen barrier properties, then food protection is improved, but adhesion force between layers is insufficient
Solution Approach 1:
The patent applies composite materials by creating a multi-layer film structure where ethylene ester copolymer is used in the layer directly bonded to polyester. This composite structure provides both the oxygen barrier properties needed for food protection and the controlled adhesion force (30-150 grams per 15mm) required for reliable bonding while maintaining recyclability.
Solution Approach 2:
The patent uses local quality by assigning different functions to different layers of the film. The layer containing ethylene ester copolymer that bonds to polyester provides both adhesion and oxygen barrier properties, while other layers provide sealing and additional barrier functions. This localized functional assignment ensures overall laminate performance meets all requirements.
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 laminate provides strong adhesion for packaging integrity while allowing easy separation of materials for recycling, with a sealing force significantly stronger than the lamination force, ensuring effective shelf life extension and recyclability.
Implementation Method 1
a polyester sheet thermally or adhesively laminated to a polyethylene film
Implementation Method 2
a polyester sheet thermally or adhesively laminated to a polyethylene film
Implementation Method 3
where the film comprises ethylene ester copolymer... to enhance oxygen barrier properties
Data Source
AI summary
The present invention describes a laminate comprising a polyester sheet laminated to a plastic film comprising polyethylene, wherein the film comprises ethylene ester copolymer and wherein the adhesion force between the polyester sheet and the film is in the range of 30-150 grams per 15mm measured according to ASTM F88.