Crosslinked PBS Multilayer Film for Vacuum Skin Packaging
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Solution Overview
Problem
Vacuum skin packaging films face challenges with irregularly shaped products due to limited polymers with adequate melt strength, leading to breakages and blowouts, necessitating a material with improved strength for effective packaging.
Innovation Solution
A crosslinked multilayer film comprising at least 20% polybutylene succinate, preferably crosslinked by electron beam or gamma radiation, with a 7-layer construction including outer, intermediate, tie, and inner layers, and high oxygen barrier materials to enhance strength and prevent blowouts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymers (EVA, ionomers) are used in vacuum skin packaging films, then the film can be processed with adequate melt strength, but the film fails when packaging irregularly shaped products due to breakages and blowouts
Solution Approach 1:
The patent changes the chemical composition parameter by incorporating polybutylene succinate (PBS) at 20-80 wt% into the film structure. PBS provides superior melt strength and elasticity compared to conventional polymers, enabling the film to accommodate irregularly shaped products without breakage or blowout while maintaining processability.
Solution Approach 2:
The patent creates a composite material system by combining polybutylene succinate with other polymers (such as polyethylene, polypropylene, or elastomers) in a multilayer structure. This composite approach leverages the high melt strength and elasticity of PBS while incorporating the beneficial properties of complementary materials to achieve overall film performance optimization.
2Adaptability or versatility
If high extensibility is required to conform to irregular products, then the film must be highly stretchable, but the film lacks sufficient strength to prevent breakages
Solution Approach 1:
The patent modifies the material parameter by using polybutylene succinate, which possesses unique viscoelastic properties with high elongation at break (greater than 100%) and superior melt strength. This allows the film to be highly extensible for conforming to irregular products while maintaining sufficient strength to prevent breakages during the packaging process.
Solution Approach 2:
The patent implements a multilayer structure where different layers have specialized functions: one or more layers contain polybutylene succinate specifically positioned to provide localized high strength and elasticity zones that prevent breakage during extension, while other layers provide sealing, barrier, or structural support properties.
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 crosslinked multilayer film with polybutylene succinate exhibits improved strength and reduced blowout failures during vacuum skin packaging, producing high-quality, appealing packs with minimal packaging errors.
Implementation Method 1
the film is crosslinked by electron beam or gamma radiation
Implementation Method 2
the film is crosslinked by electron beam or gamma radiation
Data Source
AI summary
The invention relates to a crosslinked multilayer film comprising polybutylene succinate suitable for vacuum skin packaging.