MFC Packaging Material Induction Sealing
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Solution Overview
Problem
Conventional packaging materials for sensitive objects like liquid beverages rely on aluminum for barrier properties, which poses environmental challenges, is non-recyclable, and costly, while alternatives often compromise on performance or recyclability during induction sealing.
Innovation Solution
A heat-sealable packaging material composed of a microfibrillated cellulose (MFC) layer laminated or coated with a heat-sealable material, allowing for induction sealing without aluminum, featuring a non-stick coating to prevent adherence to heated metal surfaces and maintaining effective oxygen barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminium is used for barrier properties, then oxygen barrier performance is improved, but environmental sustainability and recyclability deteriorate
Solution Approach 1:
The patent changes the material composition parameters by replacing aluminium with a multi-layer structure comprising MFC (microfibrillated cellulose), PLA (polylactic acid), and PBAT (polybutadione-adipate-terephthalate). This parameter change maintains barrier performance while improving environmental sustainability and recyclability, directly resolving the contradiction between reliability and environmental harm.
Solution Approach 2:
The invention uses a composite material structure combining MFC, PLA, and PBAT layers. The MFC provides barrier properties, PLA provides structural integrity, and PBAT provides heat-sealability. This composite approach achieves the oxygen barrier performance previously provided by aluminium while being environmentally sustainable and recyclable.
2Object-affected harmful factors
If aluminium is removed from packaging material, then environmental sustainability is improved, but induction sealability deteriorates
Solution Approach 1:
The patent introduces PBAT (polybutadione-adipate-terephthalate) as an intermediary material that enables induction sealability in the absence of aluminium. PBAT has dielectric properties that allow it to interact with induction heating fields, generating the necessary heat for sealing. This intermediary material resolves the contradiction by providing the missing functionality without compromising environmental sustainability.
Solution Approach 2:
The invention changes the dielectric and thermal parameters of the packaging material by incorporating PBAT, which has appropriate dielectric constant and loss tangent values for induction heating. This parameter change enables the material to be heated by induction fields without requiring aluminium, thus maintaining both sustainability and sealability.
3Ease of operation
If conventional polymer coatings are used for heat sealing, then heat sealability is improved, but adhesion to heated metal surfaces causes defects
Solution Approach 1:
The patent introduces a release coating as an intermediary layer between the heat-sealable material and the heated metal surface. This release coating prevents direct adhesion between the sealing material and the metal surface during induction heating, eliminating sealing defects while maintaining heat sealability. The release coating acts as a mediator that allows heat transfer while preventing unwanted 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 MFC-based packaging material achieves induction sealability without aluminum, ensuring sustainability, recyclability, and cost-effectiveness while maintaining barrier properties, suitable for various packaging applications including liquids, and is biodegradable or compostable.
Implementation Method 1
a packaging material to be heat-sealed by induction is placed against an induction heating surface
Implementation Method 2
Heat sealing is used in packaging primarily for producing or closing wraps, bags, pouches, cartons, tubes, blister packs, thin wall containers, kits and various components
Data Source
AI summary
The present invention is directed to a packaging material free from aluminium in the form of a continuous foil or film, comprising a layer of microfibrillated cellulose (MFC), wherein the layer comprising MFC has been laminated or coated on at least one side with a heat-sealable material. The MFC layer contains at least 60% by weight of microfibrillated cellulose. The present invention is also directed to a method for induction sealing, wherein a packaging material to be heat-sealed by induction is placed against an induction heating surface.