Oriented and Non-Oriented Polyethylene Films for Recyclable Packaging
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Solution Overview
Problem
Existing multi-layered articles with different materials are difficult to recycle while maintaining good mechanical, optical, and sealing properties.
Innovation Solution
A multi-layered article comprising an oriented polyethylene-based film and a non-oriented polyethylene-based film, with the non-oriented film having a skin layer, core layer, and sealing layer made from a metallocene-catalysed multimodal polyethylene copolymer, specifically composed of ethylene-1-butene and ethylene-1-hexene polymer components, to achieve balanced recyclability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-layered articles with different materials are used, then mechanical, optical, and sealing properties are improved, but recyclability deteriorates
Solution Approach 1:
The patent applies homogeneity by using the same base material (polyethylene) for all layers of the multi-layered article. Specifically, the skin layer, core layer, and sealing layer are all made from polyethylene resins, ensuring that the entire structure can be recycled together as a single material type while maintaining the performance benefits of multi-layer construction.
Solution Approach 2:
The patent uses composite materials by combining different polyethylene resins with specific properties in each layer. The skin layer uses a first polyethylene resin, the core layer uses a second polyethylene resin, and the sealing layer uses a third polyethylene resin, creating a composite structure that optimizes both performance and recyclability within the polyethylene family.
2Ease of manufacture
If mono-material solutions are used, then recyclability is improved, but mechanical, optical, and sealing properties deteriorate
Solution Approach 1:
The patent applies local quality by assigning different polyethylene resin characteristics to specific layers based on their functional requirements. The skin layer has properties optimized for surface performance, the core layer for structural integrity, and the sealing layer for heat sealability, allowing each layer to have locally optimized properties while remaining part of a recyclable mono-material structure.
Solution Approach 2:
The patent segments the multi-layered article into distinct functional layers (skin layer, core layer, sealing layer), each made from polyethylene resins with specific properties. This segmentation allows optimization of local functions while maintaining overall recyclability, as all segments are compatible with polyethylene recycling processes.
Data Source
AI summary
The present invention relates to a multi-layered article comprising at least a specific oriented polyethylene-based film (OPEF) and a specific non-oriented polyethylene-based film (NOPEF). Furthermore, the present invention relates to a method for producing said article and its use as a packaging material.