Metallized Paper Laminate for Recyclable Food Barrier Packaging
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Solution Overview
Problem
Existing food packaging materials, primarily made of plastic, face challenges in recyclability and do not effectively provide moisture and oxygen barriers, leading to environmental pollution and compromised barrier properties during handling.
Innovation Solution
A laminated food packaging material is created by combining a metallized paper sheet with a bleached paper sheet using suitable laminating adhesives, enhancing the barrier properties and mechanical strength while maintaining recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic materials are used for food packaging to provide moisture and oxygen barrier properties, then barrier performance is improved, but recyclability deteriorates and environmental pollution increases
Solution Approach 1:
The patent applies composite materials by combining metallized paper (providing barrier properties) with bleached paper (providing structural integrity and recyclability). This composite structure achieves the moisture and oxygen barrier performance previously only attainable with plastics, while the paper-based composition enables curbside recyclability and reduces environmental pollution.
2Object-generated harmful factors
If metallized paper is used to provide barrier properties, then environmental friendliness is improved, but barrier performance deteriorates compared to plastic films
Solution Approach 1:
The patent creates a composite material system where metallized paper provides the barrier function and bleached paper provides structural support. The synergistic combination results in barrier performance (water transfer rate of 0.021 g H2O/100 in2/day and oxygen transfer rate of 0.0463 cc O2/100 in2/day) that matches or exceeds conventional plastic films, while maintaining environmental friendliness through recyclability.
Solution Approach 2:
The patent improves barrier performance by optimizing the metallization parameters and paper composition. The metallized paper is engineered with specific metal coating thickness and composition to maximize barrier properties, while the paper substrate parameters are adjusted to provide structural integrity without compromising the barrier function.
3Object-generated harmful factors
If metallized paper is used for packaging, then recyclability is improved, but mechanical strength deteriorates during handling
Solution Approach 1:
The patent uses composite materials where bleached paper is laminated to metallized paper. The bleached paper layer provides tensile strength and structural integrity, allowing the packaging to withstand handling and production processes, while the metallized layer provides barrier properties. The composite structure maintains recyclability as the paper-based construction is compatible with curbside recycling programs.
4Ease of manufacture
If plastic films are used to form packaging structures, then ease of forming is improved, but recyclability deteriorates
Solution Approach 1:
The patent modifies the physical parameters of paper materials through metallization and lamination processes. The metallized paper and bleached paper are engineered with specific thickness, density, and surface properties that enable them to be formed into packaging structures comparable to plastic films, while maintaining paper-based recyclability.
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 laminated structure significantly reduces water and oxygen transfer rates, achieving performance comparable to metallized plastic films while being curbside recyclable, thus addressing the limitations of existing materials.
Implementation Method 1
a metallized or aluminum oxide coated paper sheet
Implementation Method 2
laminating a barrier-type paper with a non-barrier paper using laminating adhesives
Data Source
AI summary
A barrier-type paper (18) with a non-barrier paper (16) uses suitable laminating adhesives to form a food packaging material. More specifically, a preferred embodiment of the invention is directed to a metallized or aluminum oxide coated paper sheet (20, 21) laminated to a bleached paper sheet (16) using suitable laminating adhesive (26). The following additional layers may be added: a cold seal adhesive layer (33), an ink layer (34), and/or a cold seal release over lacquer layer (32).