Dual-Layer TPE Cable Jacket for Abrasion Resistance
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Solution Overview
Problem
Mechanical cable tracks cause excessive wear and damage to multi-conductor cables due to wiping and abrasion forces, leading to premature failure and electrical issues, as conventional materials either stretch excessively or fracture under the stress of repeated flexing and contact.
Innovation Solution
A flexible multi-conductor cable with a dual-layer jacket, where the outer layer has a low tensile modulus to resist abrasion and the inner layer has a high tensile modulus to prevent stretching, allowing for low friction contact and preventing compression that causes Z kinking, using thermoplastic elastomers with specific tensile and elongation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a single-layer jacket with high tensile modulus is used to prevent stretching, then the cable maintains its shape, but the cable becomes susceptible to abrasion and wiping damage
Solution Approach 1:
The cable uses a dual-layer jacket construction where the inner layer has high tensile modulus to prevent stretching and maintain shape stability, while the outer layer has low tensile modulus to provide abrasion resistance. This composite structure resolves the contradiction by combining materials with complementary properties that neither could achieve alone.
Solution Approach 2:
Different regions of the cable jacket have different material properties tailored to their specific functional requirements. The inner layer is optimized for dimensional stability while the outer layer is optimized for surface durability and abrasion resistance, allowing each layer to perform its specialized function.
2Object-affected harmful factors
If a single-layer jacket with low tensile modulus is used to resist abrasion, then the cable withstands wiping forces, but the cable stretches excessively under load
Solution Approach 1:
The dual-layer jacket combines an inner high-tensile-modulus layer for dimensional stability with an outer low-tensile-modulus layer for abrasion resistance. This composite approach allows the cable to simultaneously resist both stretching and wiping forces that would be impossible to withstand with a single material.
Solution Approach 2:
The jacket structure assigns different mechanical properties to different layers based on their functional needs. The inner layer provides structural integrity while the outer layer provides surface protection, creating a locally optimized structure for each functional requirement.
3Ease of manufacture
If conventional cable materials are used in mechanical cable tracks, then the cable is easy to manufacture, but the cable wears out quickly due to track contact
Solution Approach 1:
The dual-layer jacket uses thermoplastic elastomers for both layers, allowing the cable to be manufactured using conventional extrusion processes while achieving superior durability. The composite structure provides enhanced wear resistance without requiring complex manufacturing techniques, maintaining ease of production.
Solution Approach 2:
The invention changes the tensile modulus parameter of the jacket material from uniform to gradient-based, with the inner layer having high tensile modulus and the outer layer having low tensile modulus. This parameter variation enables the cable to withstand track contact forces while maintaining manufacturability using standard processes.
4Strength
If a rigid jacket material is used to prevent cable deformation, then the cable maintains structural integrity, but the cable cannot accommodate repeated flexing and bending
Solution Approach 1:
The dual-layer jacket combines rigid inner layer material for structural integrity with flexible outer layer material for adaptability to bending and flexing. This composite construction allows the cable to maintain its shape while accommodating the dynamic movements required in mechanical cable track applications.
Solution Approach 2:
The jacket structure provides different mechanical properties at different locations: the inner layer provides rigidity and structural support while the outer layer provides flexibility and conformability to track geometry, enabling the cable to simultaneously maintain integrity and adapt to movement.
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 cable design significantly enhances durability and reliability by preventing the transfer of wiping forces to conductors, maintaining performance under repeated extension and contraction, extreme temperatures, and exposure to environmental factors like UV, dust, and oils.
Implementation Method 1
typical thermoplastic elastomers and PVC's typically exhibit lower tensile modulus properties combined with a lower surface coefficient of friction, allowing them to perform well in smooth surface abrasion contact conditions
Implementation Method 2
the inner layer 26 is provided with a high tensile modulus to resist stretching forces externally applied to the cable
Implementation Method 3
Both materials include a formula of thermoplastic elastomers (TPE)... The material of the inner layer 26 is provided with a high tensile modulus to resist stretching forces externally applied to the cable. In comparison, the material of the outer layer 24 is provided with a low tensile modulus to avoid breakdown and cracking as the cable is wiped or rubbed against external surfaces
Data Source
AI summary
A flexible multi-conductor cable and a method of manufacturing a flexible multi-conductor cable, wherein the cable is adapted for use, particularly, in a mechanical cable track type lifting device. The cable includes two or more insulated conductors surrounded by a dual layer jacket. The dual layer jacket includes an inner layer having a TPE material with a higher tensile modulus, and an outer layer having a TPE material with a lower tensile modulus. The material of the cable is selected so that the cable is capable of surviving the external physical requirements of a mechanical cable track, as well as to prevent the transfer of the wiping effect onto the conductors.