Synthetic Turf Component Separation by Segmentation
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Solution Overview
Problem
Current recycling methods for synthetic turf are inefficient in separating individual components due to differences in composition compared to carpet recycling, particularly with polyurethane coatings and infill materials, leading to incomplete separation and contamination issues, which limits the reuse of materials.
Innovation Solution
A method involving multiple separation steps: downsizing, sieving by size, separation by specific gravity, and air-based separation by specific gravity and shape to achieve complete separation of backing material, grass fibers, and infill components, using equipment like cyclone separators and zig-zag air sifters, ensuring high purity fractions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional carpet recycling methods are used on synthetic turf, then the process is simpler, but the separation is incomplete and contamination occurs due to composition differences
Solution Approach 1:
The recycling process is divided into multiple sequential separation steps, each targeting specific components based on different physical properties. The first step separates infill material using a first筛分 device, the second step separates backing material using a second筛分 device, and the third step separates grass fiber components using a third筛分 device. This segmentation allows each step to focus on a specific separation task, achieving high purity for each component while maintaining an organized and manageable process structure.
Solution Approach 2:
Different separation methods and equipment are applied to different fractions of the turf material based on their specific properties. The infill material fraction receives treatment optimized for its characteristics, the backing material fraction receives treatment suited to its properties, and the grass fiber fraction receives treatment appropriate for fibrous materials. This local quality approach ensures each component is separated with maximum purity using the most suitable method for that specific material.
2Manufacturing precision
If multiple separation steps are implemented, then separation purity exceeds 95%, but the device complexity increases with multiple separators and processing stages
Solution Approach 1:
The complex separation task is broken down into three independent but sequential simpler steps, each using a dedicated筛分 device for a specific purpose. This segmentation makes the overall complex process more manageable and allows each individual device to be optimized for its specific function rather than requiring one complex device to do everything.
Solution Approach 2:
The process uses intermediate fractions as mediators between steps. The first筛分 device produces an intermediate fraction containing infill material that is then fed to the second筛分 device. The second device produces another intermediate fraction with backing material that goes to the third device. These intermediate fractions serve as bridges that connect the different separation stages, allowing the system to achieve high overall purity through a series of manageable steps.
3Productivity
If infill material is not separated, then the process is shorter, but the final product quality is compromised for high-grade reuse applications
Solution Approach 1:
The infill material separation is performed as a preliminary action before the other separation steps. By removing the infill material first using the first筛分 device, the subsequent separation processes work with a pre-cleaned material that is easier to separate into pure backing material and grass fiber components. This preliminary action prevents contamination of the final high-purity fractions and enables the process to achieve the required purity levels for high-grade reuse applications.
Solution Approach 2:
The infill material is extracted and removed from the turf composite as a distinct fraction in the first separation step. This extraction of the problematic infill component eliminates the source of contamination that would otherwise compromise the purity of the final recycling products. By taking out this difficult-to-separate component early, the remaining material can be processed more efficiently to achieve high purity levels.
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 method achieves complete separation of synthetic turf components to a purity of over 95%, enabling the reuse of individual components in high-grade products and various industries, such as rubber molding and plastic extrusion.
Implementation Method 1
separating the second fraction obtained in step (b) by specific gravity, size and shape by providing an airflow directed upwards in a separator configured to cause a swirling motion whereby the lighter fraction is entrained upwards in the air flow and the heavy fraction is allowed to fall downwards
Implementation Method 2
separating the first fraction obtained in step (b) by specific gravity using air into a low density fraction substantially comprising backing material and a high density fraction substantially comprising infill components
Data Source
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AI summary
The present invention relates to an improved method for reclaiming the individual components of synthetic or artificial turf product in a form almost similar to their original outset. The result is achieved by a method in which the turf after downsizing is subjected to at least three specific separation steps in a specific order hence the separation is based on size, specific gravity and specific gravity, size and shape.