HDPE Backing Layer for Single-Polymer Recyclable Artificial Turf
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Solution Overview
Problem
Existing artificial turf systems face challenges in achieving the required sports performance and recyclability due to the use of multiple materials, with polypropylene being unsuitable for both backing and pile layers, and polyethylene being inadequate for the backing layer due to temperature stability and creep resistance issues.
Innovation Solution
A high-density polyethylene (HDPE) backing layer with a density of at least 945 kg/m3, used for both warp and weft threads, providing improved creep resistance and dimensional stability, along with heat stabilization and specific molecular weight distribution for enhanced processability and melting point, allowing for a single-polymer artificial turf substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If polyethylene is used for the backing layer, then recyclability is improved, but temperature stability and creep resistance deteriorate
Solution Approach 1:
The patent changes the molecular parameters of polyethylene by using high density polyethylene (HDPE) with specific density (≥945 kg/m³) and molecular weight distribution (MFI ≤2 g/10 min), which provides enhanced temperature stability and creep resistance while maintaining recyclability. This parameter optimization allows polyethylene to meet the thermal performance requirements previously only satisfied by polypropylene.
2Reliability
If multiple materials are used for different layers, then sports performance is improved, but recyclability deteriorates
Solution Approach 1:
The patent applies homogeneity by using polyethylene as the common material for both the backing layer and pile fibres. This single-material approach enables complete recyclability of the artificial turf while maintaining sports performance through optimized HDPE properties and structural design, eliminating the need to separate different materials for recycling.
Solution Approach 2:
The patent creates a composite structure where polyethylene is used in different forms and configurations for the backing layer and pile fibres. By optimizing the HDPE parameters and structural arrangement, the system achieves the functional benefits of multiple materials while maintaining material homogeneity for recyclability.
3Reliability
If polypropylene is used for the backing layer, then temperature stability is improved, but recyclability deteriorates
Solution Approach 1:
The patent changes from polypropylene to high density polyethylene with specifically optimized parameters (density ≥945 kg/m³, MFI ≤2 g/10 min). This parameter optimization enables polyethylene to achieve temperature stability comparable to polypropylene while being fully recyclable, as it eliminates material incompatibility issues in recycling streams.
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 HDPE backing layer achieves similar performance to polypropylene in terms of creep resistance and temperature stability, enabling the use of polyethylene for both backing and pile layers, improving the recyclability and sports performance of artificial turf while maintaining structural integrity.
Implementation Method 1
providing improved creep resistance and dimensional stability
Implementation Method 2
along with heat stabilization and specific molecular weight distribution for enhanced processability and melting point
Data Source
AI summary
The present invention relates to a polyethylene backing layer for an artificial turf substrate consisting essentially of highly oriented, high density polyethylene filaments forming warp and weft threads, the high density polyethylene filaments having a density of at least 945 kg/m3 and a melt flow index of maximum 2 g/10 min. The invention further relates to filaments for making such a backing layer, a method for producing such filaments and an artificial turf substrate including such a backing layer.