Artificial Turf Yarn Polyethylene Composition for High-Speed Extrusion
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Solution Overview
Problem
Existing linear low density polyethylene compositions for artificial turf yarn production face challenges in achieving high extrusion line speeds without compromising curl, shrinkage, and mechanical performance.
Innovation Solution
A linear low density polyethylene composition with specific properties, including a CEF fraction of 70 to 90 °C, melt index of 2.0 to 5.0 g/10 min, and melt flow ratio of 6.7 or less, is developed for use in artificial turf yarns, which can be produced through extrusion processes and optionally stretched to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional linear low density polyethylene compositions are used in extrusion process, then yarn production can be achieved, but extrusion line speed is limited and mechanical performance is compromised
Solution Approach 1:
The patent changes the molecular weight distribution parameters of the polyethylene composition, specifically controlling the MWD to have a weight average molecular weight (Mw) of 50,000-200,000 and number average molecular weight (Mn) of 10,000-50,000, with Mw/Mn ratio of 2.0-5.0. This parameter optimization enables both high extrusion line speed and maintained mechanical performance by balancing flow characteristics with structural integrity.
Solution Approach 2:
The patent creates an optimized polyethylene composition that functions as a composite material system with controlled molecular weight distribution, comonomer content (5-20 mol%), and specific CEF fraction characteristics. This composite approach allows the material to exhibit both high processability at elevated line speeds and retained mechanical properties including curl and shrinkage resistance.
2Productivity
If conventional polyethylene compositions are used, then yarn can be produced, but curl and shrinkage properties deteriorate at high extrusion speeds
Solution Approach 1:
The patent optimizes the molecular weight distribution parameters including Mw, Mn, and their ratio, along with comonomer content and CEF fraction characteristics. These parameter changes ensure that the polyethylene composition maintains adequate molecular entanglement and chain structure even during high-speed extrusion, preserving curl and shrinkage properties essential for artificial turf yarn performance.
3Productivity
If extrusion line speed is increased, then productivity improves, but manufacturing precision of yarn properties decreases
Solution Approach 1:
The patent defines specific ranges for molecular weight parameters (Mw: 50,000-200,000, Mn: 10,000-50,000, Mw/Mn: 2.0-5.0), comonomer content (5-20 mol%), and CEF fraction (70-90°C range with ≥80% of total CEF). These controlled parameters ensure consistent yarn properties even during high-speed extrusion by maintaining stable rheological behavior and reducing process variability.
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 composition allows for higher extrusion line speeds while maintaining excellent curl and mechanical properties, resulting in improved artificial turf yarns with reduced shrinkage.
Implementation Method 1
extruding the linear low density polyethylene composition into an artificial turf filament
Implementation Method 2
stretching the artificial turf filament to a predetermined stretch ratio
Data Source
AI summary
The present disclosure provides a linear low density polyethylene composition, tapes, fibers and filaments, artificial turfs, and method of making the same. The linear low density polyethylene composition according to the present disclosure exhibits each of the following properties: (1) a CEF fraction from 70 to 90 °C of equal to or greater than 80% of the total CEF fractions; (2) a melt index, I2, measured according to ASTM D 1238 (2.16 kg @ 190°C), in the range of equal to or greater than 2.0 g/10 min and equal to or less than 5.0 g/10 min; and (3) a melt flow ratio, I10/I2, of equal to or less than 6.7.