Production of an artificial turf fiber with a non-circular cladding
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Solution Overview
Problem
Existing artificial turf fibers face challenges in replicating the resilience and visual appearance of natural grass, with issues such as delamination and high manufacturing costs, due to limitations in core-cladding cohesion and surface-to-mass ratio.
Innovation Solution
The development of bicomponent artificial turf fibers with a cylindrical core and non-circular cladding, where the core and cladding polymers are miscible, forming a quasi-monolithic transition zone for enhanced cohesion and a non-circular profile for increased surface-to-mass ratio, along with undulated sections for improved light scattering and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coextrusion technology with a third polymer component is used to increase cohesion between core and cladding, then the cohesion is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts and removes the third polymer component (compatibilizer) from the coextrusion structure, achieving cohesion between core and cladding through direct bonding of the two-component system. This simplifies the multilayer structure while maintaining or improving interfacial adhesion through optimized polymer selection and processing conditions.
Solution Approach 2:
The invention employs composite material principles by selecting specific polymer combinations for the core and cladding that are inherently compatible and can bond effectively without requiring a third compatibilizer layer. The composite structure leverages the synergistic properties of the two polymers to achieve both structural integrity and interfacial cohesion.
2Ease of manufacture
If a circular cross-section fiber is used, then the manufacturing process is simple, but the surface-to-mass ratio is low reducing visual realism and coverage
Solution Approach 1:
The invention applies asymmetry by transitioning from a symmetric circular cross-section to an asymmetric non-circular cross-section for the artificial turf fiber. This asymmetric geometry increases the surface area relative to mass, improving visual realism and light scattering properties while maintaining manufacturability through adapted extrusion die designs.
Solution Approach 2:
The invention utilizes curved and contoured surfaces in the non-circular cross-section design, creating complex curved geometries that maximize surface area while minimizing mass. The curved profiles mimic natural grass blade shapes, enhancing visual authenticity and optical properties without significantly complicating the extrusion process.
3Object-affected harmful factors
If the cladding polymer is made soft to reduce injury risk, then the safety is improved, but the resilience and mechanical stiffness decrease
Solution Approach 1:
The invention applies local quality by creating a bicomponent fiber structure where the core and cladding have distinctly different mechanical properties. The core maintains high stiffness and resilience for structural support, while the soft cladding provides a safe, injury-reducing surface. This spatial differentiation of material properties allows simultaneous optimization of both safety and mechanical performance.
Solution Approach 2:
The invention employs composite material principles by combining two polymers with complementary properties in a single fiber structure. The composite architecture allows the stiff core to provide mechanical strength and the soft cladding to provide safety, achieving a synergistic effect that neither material could achieve alone. The interface between the two materials is optimized to ensure stress transfer and structural integrity.
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
This solution results in artificial turf fibers with improved resilience, reduced delamination, and lower manufacturing costs, while mimicking the appearance and behavior of natural grass, with enhanced surface coverage and faster drying times.
Implementation Method 1
the cladding being formed by a cladding polymer which is miscible with the core polymer
Implementation Method 2
undulated sections for improved light scattering and resilience
Data Source
AI summary
A method for producing an artificial turf fiber, comprising:preparing a core polymer mixture from a core polymer and a thread polymer forming beads within the core polymer;coextruding the core polymer mixture with a cladding polymer component into a monofilament, the core polymer mixture forming a cylindrical core, The cladding polymer component forming a cladding encompassing the core with a non-circular profile;quenching the monofilament;reheating the quenched monofilament;stretching the reheated monofilament to deform the beads into threadlike regions; andproviding one or more of the stretched monofilaments as the artificial turf fiber.