Lubricated Cable Jacket Composition for Lower Pulling Force
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Solution Overview
Problem
Existing electric cable lubrication methods using external lubricants or incorporated lubricants like paraffin oil and silicone/siloxane face issues such as excessive costs, processing errors, and diminishing returns on pulling force reduction with increased lubricant concentrations.
Innovation Solution
An electric cable with a polymer jacket containing a combination of paraffin oil and acrylate functionalized polyethylene dimethyl siloxane, at specific low concentrations (0.8%-2% paraffin oil and 0.25%-1% siloxane) to reduce friction and pulling forces effectively, while avoiding processing errors and costs associated with higher lubricant levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If higher concentrations of lubricant (paraffin oil or siloxane) are used in the cable jacket, then the coefficient of friction is reduced and pulling force is decreased, but processing errors increase and costs increase with diminishing returns
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration ranges of two lubricants (paraffin oil at 0.5-2.0% and siloxane at 0.25-1.0%) to achieve the desired reduction in coefficient of friction while avoiding processing errors. This involves precisely controlling the amounts of lubricants added to the polymer composition during extrusion.
Solution Approach 2:
The patent uses composite materials by combining two different lubricant types (paraffin oil and siloxane) in a polymer matrix. This composite approach allows the benefits of both lubricants to work synergistically, achieving superior lubrication performance while maintaining processing stability and avoiding the drawbacks of using either lubricant alone at high concentrations.
2Force
If higher concentrations of lubricant are used in the cable jacket, then the coefficient of friction is reduced and pulling force is decreased, but costs increase with diminishing returns
Solution Approach 1:
The patent optimizes the concentration parameters of lubricants to achieve cost-effective lubrication. By maintaining paraffin oil at 0.5-2.0% and siloxane at 0.25-1.0%, the patent achieves significant pulling force reduction without incurring the excessive costs associated with higher lubricant concentrations, where diminishing returns set in.
Solution Approach 2:
The patent merges two different lubricant mechanisms (paraffin oil and siloxane) to achieve synergistic lubrication effects. This combination allows each lubricant to contribute its unique properties, resulting in effective friction reduction at lower overall concentrations and thus lower costs compared to using a single lubricant at high levels.
3Force
If external lubricants are applied to the cable surface, then pulling force is reduced, but the lubrication is not uniform and requires additional application devices and steps
Solution Approach 1:
The patent applies preliminary action by incorporating lubricants directly into the polymer composition during the extrusion process, before the cable is installed. This ensures uniform distribution of lubricants throughout the jacket material and on its surface, eliminating the need for separate lubrication application steps and devices that would be required if external lubricants were applied afterward.
Solution Approach 2:
The patent implements self-service by making the cable jacket itself the source of lubrication. The lubricants are embedded within the polymer matrix, allowing the cable to provide its own lubrication during installation without requiring external application devices or additional operational steps by the installer.
4Stability of the object's composition
If lubricants are incorporated into the polymer composition during extrusion, then uniform distribution is achieved, but processing stability may be affected at high lubricant concentrations
Solution Approach 1:
The patent carefully controls the concentration parameters of lubricants in the polymer composition, maintaining paraffin oil at 0.5-2.0% and siloxane at 0.25-1.0%. These optimized ranges ensure uniform distribution of lubricants throughout the jacket while staying below the thresholds that would cause processing instability during extrusion, thus maintaining both composition uniformity and processing reliability.
Solution Approach 2:
The patent uses a composite material system combining polymer base material with two complementary lubricants. This composite structure allows the lubricants to be uniformly distributed within the polymer matrix during extrusion while the polymer itself provides structural integrity and processing stability, preventing the issues that would arise from using high concentrations of a single lubricant.
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 combination of paraffin oil and siloxane lubricants in the cable jacket significantly reduces the coefficient of friction and required pulling forces, achieving better results than individual lubricants at similar concentrations, with lower costs and reduced waste, compared to prior art methods.
Implementation Method 1
The polymer composition of the jacket includes at least a base polymer, a first lubricant and a second lubricant. The first lubricant is paraffin oil lubricant included in the polymer composition of the jacket in the range of 0.8%-2% by weight and the second lubricant is a siloxane lubricant included in the polymer composition of the jacket in the range of 0.25%-1% by weight
Data Source
AI summary
The present arrangement provides for an electric cable having at least one insulated conductor and a jacket surrounding the at least one insulated conductor. The polymer composition of the jacket includes at least a base polymer, a first lubricant and a second lubricant. The first lubricant is paraffin oil lubricant included in the polymer composition of the jacket in the range of 0.8%-2% by weight and the second lubricant is a siloxane lubricant included in the polymer composition of the jacket in the range of 0.25%-1.0% by weight.