Coated Paper Dual-Layer EAA Talc Barrier
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Solution Overview
Problem
Current packaging solutions, particularly in flow wrapping and sealed bags, rely on plastic films which are not environmentally friendly and lack the necessary barrier properties to replace traditional plastic packaging effectively.
Innovation Solution
A coated paper product with a specific dual-layer coating composition, comprising a first layer of ethylene-acrylic acid (EAA) or vinyl acetate acrylate copolymer (VAcA) and a second layer of EAA and talc, applied on a machine-glazed or machine-finished kraft paper substrate, providing ductility, grease barrier, recyclability, moisture protection, heat-sealability, and satisfactory printability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plastic films are used for packaging, then barrier properties and flexibility are achieved, but environmental friendliness and recyclability are compromised
Solution Approach 1:
The patent applies composite materials by combining paper substrate with multiple coating layers (EAA copolymer layer and VAcA copolymer layer) to achieve plastic-like barrier properties while maintaining recyclability. The composite structure provides grease barrier, moisture protection, and flexibility comparable to plastic films, but with environmental benefits.
2Object-affected harmful factors
If paper-based materials are used to replace plastic, then recyclability and environmental friendliness are improved, but barrier properties and grease resistance deteriorate
Solution Approach 1:
The patent segments the packaging material into distinct functional layers: paper substrate for structural integrity, EAA copolymer layer for grease barrier properties, and VAcA copolymer layer for additional protection. This segmentation allows each layer to specialize in specific barrier functions, achieving comprehensive protection comparable to plastic films.
Solution Approach 2:
The patent uses composite materials by combining paper with polymer coatings to enhance barrier properties. The EAA and VAcA copolymers provide grease and moisture resistance to the paper substrate, creating a composite material that maintains recyclability while achieving plastic-like barrier performance.
3Reliability
If coating layers are added to paper to improve barrier properties, then grease resistance and moisture protection are enhanced, but ductility and cracking resistance deteriorate
Solution Approach 1:
The patent applies parameter changes by carefully controlling the thickness, composition, and physical properties of the EAA and VAcA copolymer layers. By optimizing these parameters, the coating provides adequate barrier properties while maintaining flexibility and ductility of the overall paper structure.
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 coated paper product achieves the necessary barrier properties, recyclability, and cost-effectiveness to replace traditional plastic films in packaging applications, such as flow wrapping and sealed bags, while maintaining flexibility and printability.
Implementation Method 1
providing a grease barrier (preventing fat from the packed/wrapped product from staining and/or weakening the paper-based material)
Implementation Method 2
heat-sealable so that a sealed package can be produced without further sealant layers
Data Source
Figure 1
AI summary
The present disclosure provides a coated paper product comprising: - a paper substrate comprising a first and second side; - a first coating layer on the first side of the paper substrate, wherein the first coating layer comprises ethylene-acrylic acid (EAA) or vinyl acetate acrylate copolymer (VAcA) or styrene-acrylate (SA) or acrylic latex; and - a second coating layer on the first coating layer, wherein the second coating layer comprises EAA and talc, and wherein the dry weight ratio of EAA to talc in the second coating layer is between 100:5 and 100:70, - wherein the coat weight of the first coating layer is at least 4 g/m², and - wherein the coat weight of the second coating layer is at least 3 g/m².