Fall Protection Webbing with UHMWPE Double-Cloth Cut Resistance
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Solution Overview
Problem
Existing fall protection systems lack a lifeline that is abrasion and cut resistant, high strength, able to absorb shock, flexible, lightweight, and compact, particularly for leading edge applications.
Innovation Solution
A webbing with a double cloth construction featuring ultra-high molecular weight polyethylene warp yarns on the exterior and high-tenacity weft yarns, interlaced in a specific weave pattern, reinforced by stuffer yarns and binder yarns, with a spiral weft yarn encircling the edges to maximize warp yarn exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional textile webbing is used in fall protection systems, then the webbing provides basic tensile strength, but it lacks sufficient abrasion and cut resistance for leading edge applications
Solution Approach 1:
The patent employs a composite construction combining ultra-high molecular weight polyethylene (UHMWPE) fibers in the warp yarns with high-tenacity fibers in the weft yarns. This composite structure provides both the abrasion and cut resistance needed for leading edge applications and maintains the tensile strength required for fall protection functionality.
Solution Approach 2:
The patent applies different fiber types to different regions of the webbing structure - UHMWPE fibers are concentrated in the warp yarns that contact leading edges, while high-tenacity fibers are used in the weft yarns for structural support. This localized material selection optimizes both abrasion resistance and tensile strength in their respective functional zones.
2Strength
If the webbing is made with high strength fibers to increase tensile strength, then the webbing becomes more resistant to failure, but it increases the weight and reduces flexibility
Solution Approach 1:
The patent utilizes ultra-high molecular weight polyethylene fibers, which have an exceptional strength-to-weight ratio. By changing the molecular weight parameter of the polyethylene fibers to the ultra-high range, the material achieves maximum tensile strength while maintaining minimum weight, thus resolving the contradiction between strength and weight.
3Volume of moving object
If the webbing construction is made compact and dense to reduce volume, then the webbing becomes more space-efficient, but it reduces flexibility and increases susceptibility to cut and abrasion
Solution Approach 1:
The patent creates a compact double-cloth construction where the warp and weft yarns are densely interlaced, but maintains flexibility and abrasion resistance through the specific material selection - UHMWPE fibers in the warp and high-tenacity fibers in the weft. This localized quality approach allows compactness without sacrificing protection.
4Device complexity
If the webbing uses a simple single-layer construction to reduce complexity, then the manufacturing process is simpler, but it cannot provide both abrasion resistance and the required flexibility simultaneously
Solution Approach 1:
The patent employs a double-cloth composite construction with two distinct layers - a warp layer providing abrasion and cut resistance through UHMWPE fibers, and a weft layer providing flexibility and structural support through high-tenacity fibers. This composite approach resolves the contradiction by assigning different functional properties to different layers.
Data Source
AI summary
A webbing for use in a fall protection device, such as a self-retracting lifeline having leading edge capabilities, is provided having a double cloth construction with the exterior of the webbing constructed of woven, ultra-high molecular weight polyethylene yarns and having stuffer yarns positioned in the interior of the fabric, wherein the stuffer yarns are made of high-tenacity fibers, such as aramid fibers.