Polyolefin Gas-Barrier Coating With PECVD Thin-Film Layers
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Solution Overview
Problem
Polyolefin containers have low gas barrier properties, leading to issues with gas permeability, which complicates the storage of food and beverages, and existing solutions like multi-layer co-extrusion are costly and environmentally unfriendly, with plasma coatings facing challenges in adhesion and cracking on polyolefin surfaces.
Innovation Solution
A polyolefin container coated with a thin layer of hydrogenated amorphous silicon nitride followed by a layer of hydrogenated amorphous carbon, deposited using plasma-enhanced chemical vapor deposition, providing a robust gas barrier without the need for multiple layers or complex masking processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layer co-extrusion is used to improve gas barrier properties, then gas barrier properties are improved, but manufacturing cost increases and recyclability deteriorates
Solution Approach 1:
The barrier coating is divided into multiple thin layers (silicon oxide layer and hydrogenated amorphous carbon layer) deposited on the polyolefin container, replacing the need for multi-layer co-extrusion. This segmentation allows each layer to provide specific barrier functions while maintaining overall cost-effectiveness and recyclability.
Solution Approach 2:
The mechanical co-extrusion process is replaced with plasma-enhanced chemical vapor deposition (PECVD) to apply barrier layers. This substitution reduces manufacturing complexity and cost while achieving superior gas barrier properties, and the coated container remains predominantly polyolefin for easier recycling.
2Reliability
If thicker barrier coating is applied to improve gas barrier properties, then gas barrier properties are improved, but risk of cracking increases
Solution Approach 1:
The barrier function is segmented across multiple thin layers rather than using a single thick layer. The silicon oxide layer and hydrogenated amorphous carbon layer are each deposited as thin films, collectively providing superior gas barrier properties while minimizing the risk of cracking and maintaining coating flexibility.
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 solution achieves improved gas barrier properties with reduced thickness, minimizing the risk of cracking and environmental impact, allowing for efficient recycling and effective storage of food and beverages while maintaining product quality.
Implementation Method 1
depositing a layer of hydrogenated amorphous silicon nitride on a polyolefin container by plasma-enhanced chemical vapor deposition and depositing a layer of hydrogenated amorphous carbon on the hydrogenated amorphous silicon nitride layer by plasma-enhanced chemical vapor deposition
Data Source
AI summary
The present invention relates generally to the field of polyolefin containers. One aspect of the invention is a polyolefin container coated with a gas barrier coating. In particular, the present invention relates to a polyolefin container coated with a gas barrier coating comprising a first layer of hydrogenated amorphous silicon nitride and a second layer of hydrogenated amorphous carbon. The hydrogenated amorphous silicon nitride layer may be deposited on the container, and the hydrogenated amorphous carbon layer may be deposited on the hydrogenated amorphous silicon nitride layer. A further aspect of the invention is a process for coating a polyolefin container comprising the steps of depositing a layer of hydrogenated amorphous silicon nitride on a polyolefin container by plasma-enhanced chemical vapor deposition and depositing a layer of hydrogenated amorphous carbon on the hydrogenated amorphous silicon nitride layer by plasma-enhanced chemical vapor deposition. A subject matter of the invention is the use of the polyolefin container coated with a gas barrier coating for the storage of food or beverage materials.