Multi-Layer Round Sling Sleeve to Prevent Fabric Opening
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Solution Overview
Problem
Conventional round slings experience tissue expansion and opening under load, leading to potential holes and penetration of foreign objects due to the entanglement and shifting of warp threads within the fabric structure, compromising the protective sheath integrity.
Innovation Solution
A round sling with a multi-layered textile fabric structure, where warp threads have low elongation and weft threads have high elongation, interconnected by additional weft threads acting as connecting threads, forming a more closed fabric structure under load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional single-layer elastic tubular fabric with high elongation weft threads is used, then the protective sleeve can expand under load, but the fabric structure opens up causing holes and compromising integrity
Solution Approach 1:
The patent applies composite material principles by combining multiple fabric layers with different thread configurations. The first layer has elastic weft threads for expansion, while the second layer has inelastic weft threads to maintain structural integrity. This composite structure allows the protective sleeve to expand under load while preventing fabric opening and hole formation.
Solution Approach 2:
The patent introduces an additional dimensional aspect by stacking multiple fabric layers in the radial direction. Instead of relying on a single layer that must simultaneously provide both expansion and integrity, the solution distributes these functions across multiple layers arranged in sequence, with each layer contributing different mechanical properties.
2Adaptability or versatility
If warp threads are allowed to entangle and shift within the fabric structure, then the fabric can accommodate expansion, but tissue dilations and openings occur leading to weak points
Solution Approach 1:
By combining layers with different thread elasticities, the patent creates a composite structure where the inelastic weft threads in the second layer act as a barrier to prevent warp thread displacement from creating openings. This composite approach maintains fabric flexibility while blocking the harmful effect of foreign object penetration.
Solution Approach 2:
The second layer with inelastic weft threads serves as a pre-positioned protective barrier that cushions against the potential harmful effects of fabric opening. Even if the first layer experiences warp thread displacement, the second layer prevents this from creating actual openings that could allow foreign object penetration.
3Difficulty of detecting and measuring
If multi-layered fabric with bonded layers is used, then visual inspection for damage is improved, but the complexity of the protective sleeve structure increases
Solution Approach 1:
The patent uses composite material principles with multiple bonded fabric layers, where each layer can be inspected for damage independently. The bonding between layers provides clear visual interfaces that make it easier to detect delamination or damage, while the modular composite structure allows for standardized manufacturing processes.
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
Reduces fabric expansion and hole formation, enhancing the protective sleeve's integrity by maintaining a closed fabric surface and preventing foreign object penetration.
Implementation Method 1
the weft threads, running essentially transversely to the longitudinal direction, in the transverse direction Q and thus also transversely to the warp threads, have high elongation relative to their tensile strength
Data Source
Figure 1~2.1
AI summary
The invention relates to a round sling for raising loads, consisting of a load-carrying inner nonwoven fabric, which inner nonwoven fabric is formed from a continuous roll of a plurality of supporting threads running substantially parallel to one another and a protective sleeve in the form of a textile protective tube surrounding the inner nonwoven fabric with a radial degree of freedom, the protective tube being a textile fabric woven from warp and weft threads. The textile fabric consists of a multi-layer woven fabric in which each of the woven fabric layers has warp threads which run in the longitudinal direction (L) or longitudinal extent of the protective tube and which consist of fibres or threads having a low expansion capacity in relation to their high tensile strength, and the weft threads running transversely to the longitudinal direction having a high expansion capacity in relation to their tensile strength, the woven fabric layers of the multi-layer woven fabric having further weft threads running transversely to the longitudinal direction which have a high expansion capacity in relation to their tensile strength.