Polyolefin Laminate Packaging for Recyclable Transparent Barrier Films
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Solution Overview
Problem
Conventional aluminum-plastic film packaging materials are composed of heterogeneous materials, making them difficult to recycle and reuse, and their opacity limits their application to products with special requirements.
Innovation Solution
A polyolefin packaging material composed of a first polyolefin polymer film, a second polyolefin polymer film, and a polyolefin bonding adhesive layer formed of a polyolefin copolymer modified by maleic anhydride, which allows for direct recycling and reuse, while maintaining transparency and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is used as a gas barrier in conventional aluminum-plastic film packaging material, then gas barrier performance is improved, but transparency is reduced and recyclability is worsened
Solution Approach 1:
The patent changes the material composition parameters by replacing aluminum foil with polyolefin resin containing specific functional groups (carboxyl, hydroxyl, or amine groups). This parameter change maintains gas barrier performance while improving transparency and recyclability, as the polyolefin resin can be processed and separated more easily than aluminum-plastic composite materials.
Solution Approach 2:
The patent uses composite materials by combining polyolefin resin with specific functional groups and reinforcing fillers (such as clay, silica, or titanium dioxide) to create a multi-functional barrier layer. This composite structure provides both gas barrier properties and transparency, while the polyolefin base material ensures recyclability.
2Strength
If heterogeneous materials (polyester glue, aluminum foil, polyolefin) are used in conventional aluminum-plastic film packaging material, then bonding between layers is achieved, but recyclability is worsened
Solution Approach 1:
The patent applies homogeneity by using polyolefin resin as the bonding adhesive, which is chemically compatible with the polyolefin film layers. This eliminates the need for polyester glue and creates a homogeneous polyolefin-based structure throughout the packaging material, enabling direct recycling and reprocessing of the entire laminate as a single material type.
Solution Approach 2:
The patent extracts and removes the polyester glue layer from the conventional aluminum-plastic film structure. By eliminating this heterogeneous component, the packaging material becomes composed entirely of polyolefin-based materials that can be easily separated and recycled together, improving overall recyclability.
3Reliability
If conventional aluminum-plastic film packaging material is used, then gas barrier function is provided, but direct recycling and reuse are prevented
Solution Approach 1:
The patent changes the material composition to use polyolefin resin with functional groups instead of aluminum foil and polyester glue. This parameter change enables the entire packaging structure to be processed through standard polyolefin recycling streams, dramatically simplifying the recycling process from complex multi-material separation to single-material reprocessing.
4Strength
If polyester glue is used to bond polyolefin and aluminum foil layers, then layer bonding is achieved, but material compatibility is reduced
Solution Approach 1:
The patent replaces polyester glue with polyolefin resin containing functional groups that provide both structural integrity and adhesive properties. This creates a homogeneous polyolefin-based system where all layers are chemically compatible, eliminating the material mismatch between polyester adhesive and polyolefin/aluminum components.
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 polyolefin packaging material achieves better bonding strength, transparency, and impact resistance, enabling direct recycling and reuse, and can be applied to industrial, electronic, and food packaging, replacing conventional aluminum-plastic film laminates.
Implementation Method 1
The polyolefin bonding adhesive layer is formed of a polyolefin copolymer modified by maleic anhydride
Implementation Method 2
The second polyolefin polymer film is the biaxially oriented polypropylene film that has undergone an evaporation process
Data Source
AI summary
A polyolefin packaging material includes a first polyolefin polymer film, a second polyolefin polymer film, and a polyolefin bonding adhesive layer. The first polyolefin polymer film is a cast polypropylene film (CPP film). The second polyolefin polymer film is a biaxially oriented polypropylene film (BOPP film). The polyolefin bonding adhesive layer is bonded between the first polyolefin polymer film and the second polyolefin polymer film. The polyolefin bonding adhesive layer is formed of a polyolefin copolymer modified by maleic anhydride, the polyolefin copolymer is formed by copolymerization of at least two kinds of C2 to C4 olefin molecules, a graft ratio of the maleic anhydride grafted onto the polyolefin copolymer is between 0.5% and 5%, and a melt index of the polyolefin copolymer is between 1 g/10 min and 5 g/10 min.