Artificial Turf Fiber With Non-Circular Cladding and Strong Core Bonding
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Solution Overview
Problem
Existing artificial turf fibers face challenges in replicating the resilience and softness of natural grass blades, with issues of delamination and high manufacturing costs due to the wear-off of coatings and loss of cohesion between core and cladding materials under mechanical stress and environmental conditions.
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 featuring undulated sections for increased surface-to-mass ratio and light scattering, reducing liquid adhesion, and mimicking natural grass blades' appearance and resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coating is applied to wrap or coat a resilient core fiber to provide a soft outer surface, then the softness and resemblance to natural grass is improved, but the coating may wear off or delaminate under mechanical forces and environmental conditions
Solution Approach 1:
The patent merges the core fiber and cladding material into a single coextruded bicomponent fiber structure. The core polymer and cladding polymer are combined in the molten state during extrusion, creating a unified structure where the cladding is permanently bonded to the core, eliminating the wear-off and delamination issues associated with separate coating applications.
Solution Approach 2:
The patent uses composite materials by combining two different polymers (core polymer and cladding polymer) with complementary properties. The core provides mechanical strength and resilience, while the cladding provides softness and natural grass resemblance, creating a fiber that exhibits both properties simultaneously without the drawbacks of layered construction.
2Reliability
If a third polymer component is introduced to interface between core and cladding to increase cohesion, then the durability is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the intermediate third polymer component from the fiber structure, relying instead on the direct bonding capability of the core and cladding polymers. By selecting polymers with compatible processing temperatures and good interfacial adhesion, the invention achieves strong cohesion without requiring an additional interfacing layer, thereby simplifying the manufacturing process.
3Productivity
If the cladding is made circular to simplify manufacturing, then the production efficiency is improved, but the surface-to-mass ratio and light scattering properties are reduced
Solution Approach 1:
The patent introduces asymmetry by forming the cladding with a non-circular cross-section (such as oval, triangular, or other polygonal shapes). This asymmetric geometry increases the perimeter-to-area ratio compared to a circular cross-section, thereby enhancing the surface-to-mass ratio and improving light scattering properties while still maintaining manufacturability through standard extrusion dies.
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 solution provides improved resilience, reduced risk of injuries, enhanced durability, and cost-effective production with increased surface coverage per unit area, while maintaining mechanical stability and mimicking natural grass blades' appearance and behavior.
Implementation Method 1
the cladding being formed by a cladding polymer which is miscible with the core polymer
Data Source
AI summary
An artificial turf fiber comprising at least one monofilament, each monofilament comprising a cylindrical core and a cladding. The core comprises a core polymer and threadlike regions formed by a thread polymer and embedded in the core polymer. The cladding is formed by a cladding polymer surrounding the core. It has a non-circular profile and is miscible with the core polymer.