Triangular Needle Elements for Elastic Material Fibrillation
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Solution Overview
Problem
Existing needle devices with round needles are ineffective for fibrillating more elastic synthetic materials, such as those with higher polyethylene content, as they tend to tear the material rather than split it, and the mounting and replacement of needle blades in these devices are labor-intensive.
Innovation Solution
A needle device featuring flat, triangular needle elements with cutting edges that are mounted on bar-like carriers, allowing for easy installation and replacement, and a dovetail configuration for secure fastening, enabling effective fibrillation of more elastic materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If round needles are used in the needle roller, then the device can process traditional synthetic materials, but it fails to effectively fibrillate more elastic synthetic materials and tends to tear them
Solution Approach 1:
The needle elements are designed with different geometries (triangular cross-section with cutting edges) at their working tip compared to their shaft, providing localized cutting functionality where needed while maintaining structural integrity elsewhere. This local differentiation enables effective fibrillation of elastic materials without compromising overall needle durability.
Solution Approach 2:
The invention changes the geometric parameters of the needle elements from round cross-section to triangular cross-section with specific cutting edge angles. This parameter change transforms the needle action from tearing (round needles) to cutting (triangular needles with edges), enabling reliable fibrillation of elastic synthetic materials.
2Reliability
If individual triangular blades are mounted in dovetail grooves in the roller, then the cutting function is improved, but the mounting and replacement of needle elements becomes very labour-intensive
Solution Approach 1:
The needle device is segmented into modular components: the needle roller, the bar-like carriers, and the individual triangular needle elements. This segmentation allows needle elements to be mounted on carriers first (simplifying handling) and then the entire carrier assembly to be mounted on the roller, reducing labor intensity while maintaining cutting performance.
Solution Approach 2:
The bar-like carriers serve as intermediary components between the needle roller and the triangular needle elements. The carriers simplify the mounting process by providing a convenient platform to hold multiple needle elements, which can then be collectively mounted on the roller, significantly reducing the labor required compared to mounting each needle element directly into individual grooves.
3Reliability
If worn needle elements are replaced individually in dovetail grooves, then cutting performance is maintained, but the replacement process is time-consuming and complex
Solution Approach 1:
The modular segmentation allows worn needle elements to be replaced by detaching entire carrier assemblies from the roller and replacing carriers on a batch basis, rather than individually replacing each needle element in its groove, significantly reducing replacement time while maintaining cutting performance through standardized carrier designs.
Solution Approach 2:
The design facilitates discarding worn needle carriers as complete units and recovering functional carriers for reuse. This approach is more efficient than attempting to salvage and reposition individual needle elements, as the standardized carrier design allows quick identification of worn units and their replacement as complete assemblies.
Data Source
AI summary
A needle device for processing an in particular strip-shaped planar structure comprises a needle bed, on which a plurality of needle elements provided with tips are arranged in such a manner that the needle elements protrude from the needle bed and the tips thereof point away from the needle bed. The needle elements are designed as flat blades each of which having at least one cutting edge extending from the tip of the needle element toward the needle roller. The needle elements are fastened via leg-shaped mounting members in bar-like needle carriers, which are in turn inserted in grooves of the needle roller.