Heat-Sealing Coating System for Multi-Material Foil Substrates
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Solution Overview
Problem
Current heat seal binders are not suitable for sealing both aluminum and PET foils or coatings against various cup materials like polystyrene, polypropylene, polyester, and polyvinyl chloride, with limited processing range and reliability, especially in multi-cavity filling systems, and lack high heat stability for short cycle times.
Innovation Solution
A heat-sealable coating system containing a polymer type A, a polyester or polyester mixture, a (meth)acrylate homo- and/or copolymer, and a graft copolymer of A and B, with specific weight ratios and solvent mixtures, enabling sealing of polyester films or PET-coated films against multiple substrates, including aluminum and PET-coated films, with high adhesion strength at elevated temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If poly(meth)acrylate resins are used for sealing polystyrene or PVC, then adhesion strength is improved, but they are not suitable for sealing polypropylene containers
Solution Approach 1:
The patent modifies the chemical composition parameters of the sealing varnish by incorporating polypropylene-compatible polymers (polyethylene, polypropylene, ethylene-propylene copolymers) alongside the poly(meth)acrylate resins. This parameter change enables the varnish to adhere to polypropylene containers while maintaining compatibility with polystyrene and PVC, thus resolving the limitation of material-specific adhesion.
Solution Approach 2:
The invention creates a composite sealing varnish system that combines multiple polymer types (poly(meth)acrylate resins, polyethylene, polypropylene, ethylene-propylene copolymers) with specific functional roles. This composite material approach allows the varnish to exhibit multi-material compatibility, enabling it to bond effectively to different container materials including polypropylene, polystyrene, and PVC simultaneously.
2Strength
If heat seal binders are formulated for specific materials, then adhesion strength is improved, but versatility across different container materials deteriorates
Solution Approach 1:
The patent develops a universal sealing varnish composition that can function effectively on multiple substrate types (polypropylene, polystyrene, PVC, and other plastics). The varnish contains a synergistic combination of polymers and additives that provide broad-spectrum adhesion capabilities, allowing a single formulation to serve multiple sealing applications across different container materials without sacrificing seal strength.
3Object-affected harmful factors
If aluminum foil is used for sealing, then barrier properties are improved, but processing width and temperature range are limited
Solution Approach 1:
The patent modifies the thermal and rheological parameters of the sealing varnish by incorporating polymers with appropriate melting points and flow characteristics. The varnish formulation includes polyethylene and polypropylene components that provide a broader processing temperature window, allowing reliable sealing across varying production conditions while maintaining the barrier properties needed for food 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 coating system achieves high seal strengths and barrier properties comparable to established systems, ensuring reliable sealing across a broader temperature range and cycle times, enhancing processing reliability and efficiency in multi-cavity systems.
Implementation Method 1
a graft copolymer of A and B
Implementation Method 2
heat-sealable coating system...with high adhesion strength
Implementation Method 3
heat sealing...at elevated temperatures
Implementation Method 4
processing reliability and efficiency in multi-cavity systems
Data Source
AI summary
The invention relates to a heat-sealable coating system which is suitable for sealing different bottoms. Said heat-sealable coating system contains a film forming dispersion while being characterized in that a polymer type A, a polyester, or a polyester mixture is contained, a polymer type B representing a (meth)acrylate homomer or/and copolymer containing standard methacrylates and/or standard acrylates is contained, and a polymer type AB, a graft copolymer of polymer type A and polymer type B is contained, and an optional polymer type C, an olefin polymer, or an olefin copolymer is contained, and a polymer type CB, a graft polymer of polymer type C and polymer type B is contained, and an optional polymer type D and/or a polymer type DA is contained.