Artificial Yarn Transversal Stretching for Turf Durability
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Solution Overview
Problem
Existing processes for producing artificial yarn for synthetic turf mats result in undesirable transversal tensile strength, leading to wear and breakage, and rely on PerFluorinated Alkylated Substances (PFAS) that are environmentally and health-hazardous.
Innovation Solution
A process involving the production of artificial yarn that includes transversally and longitudinally stretching semi-finished yarns made of polymeric materials, while heating above the glass transition temperature, to orient polymeric chains in both directions, thereby enhancing tensile strength and reducing PFAS usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the semi-finished yarn is stretched only along the longitudinal direction during production, then the production process is simple and productive, but the transversal tensile strength of the artificial yarn is insufficient
Solution Approach 1:
The patent applies dimensional change by introducing transversal stretching in addition to longitudinal stretching. The semi-finished yarn is stretched not only along its length (longitudinal direction) but also across its width (transversal direction), transforming a one-dimensional stretching process into a two-dimensional stretching process. This resolves the contradiction by improving transversal tensile strength through transversal stretching while maintaining production efficiency through systematic process integration.
2Productivity
If PFAS is used as a component in the polymeric material, then the productivity and strength of the yarn are maintained, but the environmental and health impact is negative
Solution Approach 1:
The patent applies extraction by removing PFAS (PerFluorinated Alkylated Substances) from the polymeric material composition. The invention successfully eliminates this harmful substance from the yarn production process while compensating for its functional benefits through alternative means (the dual-direction stretching process), thereby resolving the contradiction between maintaining productivity and eliminating environmental hazards.
Solution Approach 2:
The patent applies parameter changes by modifying the physical and mechanical parameters of the polymeric material through controlled stretching processes. By changing the orientation and arrangement of polymer chains through transversal and longitudinal stretching at elevated temperatures, the material achieves the necessary strength and productivity characteristics without relying on PFAS additives.
3Adaptability or versatility
If the artificial yarn is used in synthetic turf mat, then it provides decorative and functional use, but it undergoes wear and breakage due to transversal stresses
Solution Approach 1:
The patent applies dimensional change by implementing transversal stretching to strengthen the yarn in the direction perpendicular to its length. This creates a more balanced structural integrity in both longitudinal and transversal directions, enabling the yarn to withstand the multi-directional stresses encountered during synthetic turf usage while maintaining its decorative and functional properties.
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 process results in artificial yarn with improved durability and resistance to transversal stresses, reducing microfiber dispersion and allowing for a significant reduction or elimination of PFAS without compromising productivity or yarn strength.
Implementation Method 1
heating the yarn above the glass transition temperature and stretching the semi-finished yarn
Implementation Method 2
stretching the semi-finished yarn along the longitudinal direction... transversally stretching said semi-finished yarn along a transversal direction perpendicular to said longitudinal direction
Implementation Method 3
final cooling said semi-finished yarn for obtaining said artificial yarn
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
Process for producing an artificial yarn (3), comprising: - providing a semi-finished yarn (1) made of a polymeric material (70), the semi-finished yarn (1) having a longitudinal direction (200); - advancing the semi-finished yarn (1) along an advancement direction parallel to said longitudinal direction (200), during the advancing: - heating the semi-finished yarn (1) above a predetermined temperature; - transversally stretching the semi-finished yarn (1) along a transversal direction (201) perpendicular to the longitudinal direction (200); - longitudinally stretching the semi-finished yarn (1) along the longitudinal direction (200); - final cooling the semi-finished yarn (1) for obtaining the artificial yarn (3).