Electroless Metallic Coating for Elevator Belt Fire Retardation
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Solution Overview
Problem
Elevator belts used in high-rise systems face challenges in meeting fire retardation standards, as existing coatings do not adequately prevent flame propagation between the traction and back surfaces, posing a safety risk.
Innovation Solution
A metallic coating layer, comprising materials like nickel, copper, or aluminum, is applied discontinuously to the end and selected portions of the traction and back surfaces of the belt using an electroless plating process, enhancing fire retardation properties and adhesion through surface activation methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous metallic coating is applied to the entire belt surface, then fire retardation properties are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The metallic coating is applied discontinuously in segmented sections rather than as a continuous layer. The coating is applied to specific zones (end surfaces and selected portions of traction/back surfaces) separated by uncoated regions, creating a segmented fire barrier that maintains effectiveness while reducing manufacturing complexity
Solution Approach 2:
Different regions of the belt are assigned different coating characteristics. The end surfaces and selected portions receive metallic coating for fire retardation, while other regions remain uncoated. This local differentiation optimizes fire protection where most needed while avoiding unnecessary coating elsewhere
2Reliability
If a metallic coating layer is applied to the belt, then fire retardation properties are improved, but adhesion between coating and belt material may be insufficient
Solution Approach 1:
Surface activation treatments are performed before applying the metallic coating to prepare the belt surface. This preliminary action modifies the surface properties to enhance coating adhesion, ensuring the fire retardation coating remains firmly attached during belt operation
Solution Approach 2:
The solution employs composite material structures by combining the metallic coating layer with the elastomeric belt material. The surface activation creates an intermediate layer or modifies surface chemistry to ensure strong bonding between the dissimilar materials (metallic coating and elastomer), creating a durable composite structure
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 metallic coating effectively prevents flame propagation, improving the fire safety performance of the elevator belt by creating a discontinuous layer that enhances durability and traction while meeting safety standards.
Implementation Method 1
The metallic coating layer is applied to at least one end surface of the two end surfaces from a liquid solution to improve fire retardation properties of the belt. The metallic coating layer is applied discontinuously along a length of the belt.
Implementation Method 2
enhancing fire retardation properties and adhesion through surface activation methods
Data Source
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AI summary
A belt (30) for an elevator system (10) includes a plurality of tension members (42) arranged along a belt width (40), a jacket material (44) at least partially encapsulating the plurality of tension members defining a traction surface (32), a back surface (34) opposite the traction surface together with the traction surface defining a belt thickness (36), and two end surfaces (38) extending between the traction surface (32) and the back surface (34) defining the belt width (40). A metallic coating layer (50) applied from a liquid solution is positioned over at least one end surface of the two end surfaces (38).