Thermoplastic Extrusion Die for Composite Cable Forming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current metallic and synthetic cables and ropes face challenges such as weight, corrosion, kinking, ease of damage, and handling difficulties, while synthetic ropes suffer from water absorption and electrical conductivity issues.
Innovation Solution
A thermoplastic extrusion die with a resilient insert and mechanical locking mechanism is used to form a cable or wire rope with unidirectionally aligned continuous fibers, impregnated and coated with a thermoplastic polymer, allowing for tailored mechanical properties and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic cables and ropes are used, then tensile strength and abrasion resistance are improved, but weight increases significantly
Solution Approach 1:
The patent employs composite construction by combining synthetic fiber strands with thermoplastic polymer coating. The synthetic strands (aramid, polyethylene, or polyester) provide high tensile strength and low weight, while the thermoplastic coating adds abrasion resistance and protective properties. This composite approach achieves metallic-level strength without the weight penalty.
2Reliability
If metallic cables and ropes are used, then electrical conductivity is improved, but corrosion resistance deteriorates
Solution Approach 1:
The patent uses synthetic polymer materials that inherently resist corrosion without requiring protective coatings like galvanization. The thermoplastic coating and synthetic strands are selected for their natural corrosion resistance, eliminating the need for additional protective measures required by metallic cables.
3Weight of moving object
If synthetic ropes are used, then weight-to-strength ratio is improved, but water absorption increases
Solution Approach 1:
The patent carefully selects specific synthetic polymer types (aramid, polyethylene, polyester) and adjusts their physical and chemical parameters to minimize water absorption. The thermoplastic coating acts as a moisture barrier, and the polymer composition is optimized to be hydrophobic, maintaining low water uptake while preserving lightweight properties.
4Ease of operation
If synthetic ropes are used, then flexibility and handling ease are improved, but resistance to abrasion deteriorates
Solution Approach 1:
The patent creates a composite structure where the synthetic fiber strands maintain flexibility and handling properties, while the thermoplastic polymer coating provides enhanced abrasion resistance. The coating acts as a protective layer that prevents wear on the underlying flexible strands.
5Ease of operation
If mechanical fasteners are used for connection loops, then ease of connection is improved, but damage to strands and filaments increases
Solution Approach 1:
The patent introduces a splicing process as an intermediary method for creating connection loops. Instead of using mechanical fasteners that directly contact and damage the strands, the splicing process uses heat and pressure to fuse the thermoplastic coating and melt the synthetic strands together, creating a seamless connection that preserves strand integrity.
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 solution enhances the strength-to-weight ratio, resistance to abrasion, and handling ease of the rope, while minimizing water absorption and electrical conductivity, providing a safer and more durable alternative.
Implementation Method 1
thermoplastic extrusion die
Implementation Method 2
resilient or elastomer insert
Data Source
AI summary
A thermoplastic extrusion die is disclosed. The thermoplastic extrusion die includes a housing, and a resilient or elastomer insert having an inlet through the housing, and a passage through the resilient insert. Embodiments have a mechanical locking mechanism configured to communicate physical pressure to the resilient insert thereby narrowing the passage for contact with traversing rovings.