Polyethylene Furanoate Barrier Layer for Flexible Cable Protection
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Solution Overview
Problem
Existing barrier layers for cables and hoses, such as aluminum, fluoropolymers, and polyethylene terephthalate (PET), are either inflexible, require high processing temperatures, or have inadequate barrier properties against substance migration, limiting their effectiveness and flexibility.
Innovation Solution
A barrier layer composed of polyethylene furanoate (PEF) is used, which is flexible, provides superior barrier properties against substances like oxygen, carbon dioxide, and water, and can be extruded with a sheath layer in a single operation, eliminating the need for additional processing steps and ensuring a permanent join.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an aluminum layer is used as a barrier layer around an electrical conductor, then the barrier layer provides effective protection against atmospheric moisture, but the cable becomes inflexible and can perform only a limited number of flexural fatigue cycles
Solution Approach 1:
The patent changes the material parameters from rigid aluminum to flexible polymers (polyethylene terephthalate and polyethylene furanoate), transforming the barrier layer from a rigid protective coating to a flexible yet effective moisture barrier that maintains cable flexibility while providing reliable protection
Solution Approach 2:
The patent uses composite polymer structures, particularly combining polyethylene furanoate with polyethylene terephthalate in multi-layer configurations, to achieve both the protective barrier function and the flexibility required for repeated bending cycles
2Reliability
If fluoropolymers are used as barrier layers, then the barrier layer provides effective protection against substance migration, but the processing temperature becomes excessively high causing thermal decomposition of other plastics materials
Solution Approach 1:
The patent changes the processing temperature parameter by selecting polyethylene furanoate and polyethylene terephthalate as barrier layer materials, which can be processed at typical extrusion temperatures (below 200°C), avoiding the excessively high temperatures required for fluoropolymers and preventing thermal decomposition of adjacent plastic materials
3Ease of manufacture
If polyethylene terephthalate is used as a barrier layer, then the barrier layer can be processed at moderate temperatures, but the barrier properties against substance migration are only moderate and not suitable for acid-containing substances
Solution Approach 1:
The patent employs composite multi-layer structures where polyethylene furanoate (providing superior barrier properties against oxygen, carbon dioxide, and acid-containing substances) is combined with polyethylene terephthalate (providing processability at moderate temperatures), thereby achieving both ease of manufacture and high reliability of barrier properties
4Reliability
If a closed impermeable barrier layer is provided to prevent substance migration, then the barrier layer provides effective protection, but the flexibility and bendability of the cable or hose is restricted
Solution Approach 1:
The patent changes the material parameters by using flexible polymer materials (polyethylene furanoate and polyethylene terephthalate) with appropriate molecular structures and glass transition temperatures, enabling the barrier layer to maintain both impermeability against substance migration and flexibility for repeated bending operations
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 PEF barrier layer significantly enhances the flexibility and impermeability of cables and hoses, allowing for numerous flexural fatigue cycles while preventing substance migration, and is biobased and 100% recyclable, offering improved performance compared to traditional materials.
Implementation Method 1
a barrier layer against migration of a substance, wherein the barrier layer is arranged in a cable and/or around an electrical conductor or in a hose, and the barrier layer contains polyethylene furanoate or consists of polyethylene furanoate
Implementation Method 2
a method for manufacturing a coated cable or a coated hose by means of an extrusion device
Data Source
AI summary
A barrier layer is used against migration of a substance, wherein the barrier layer is arranged in a cable and/or around an electrical conductor, and the barrier layer contains polyethylene furanoate or solely contains polyethylene furanoate. Furthermore, an electrical conductor, a cable, and a method are used for manufacturing a coated cable or a coated hose and a use of polyethylene furanoate as a barrier layer.