Cable Jacket Friction Reduction via Composite Extrusion
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Solution Overview
Problem
The installation of electrical cables is hindered by high friction, requiring significant pulling force and potentially causing damage, and existing methods to reduce friction are either ineffective or labor-intensive, affecting the aesthetic quality and requiring additional materials on-site.
Innovation Solution
An extrusion method using a pelletized composition of polymerized silica, mineral oil, and nylon, applied as an outer jacket, which reduces the coefficient of friction and pulling force during cable installation, eliminating the need for lubricants and manual application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional extrusion methods are used without friction-reducing additives, then the cable structure is simple and manufacturing is straightforward, but the coefficient of friction is high and pulling force during installation is excessive
Solution Approach 1:
The patent applies composite materials by combining polymerized silica, mineral oil, and nylon into a single extrudable composition. This composite jacket material provides both structural integrity and friction-reducing properties, eliminating the need for separate lubrication systems while reducing pulling force during cable installation.
Solution Approach 2:
The patent changes the physical and chemical parameters of the jacket material by polymerizing silica and incorporating specific ratios of mineral oil (5-20 parts per hundred parts of polymer) and lubricants. These parameter changes transform the jacket from a high-friction material to a low-friction surface that reduces pulling force during installation.
2Ease of operation
If lubricants are applied manually at the job site, then friction is reduced during installation, but the process becomes labor-intensive and time-consuming
Solution Approach 1:
The patent applies preliminary action by incorporating all necessary friction-reducing components (polymerized silica, mineral oil, and lubricants) into the jacket composition during manufacturing. This preliminary incorporation eliminates the need for manual lubricant application at the job site, reducing both labor intensity and installation time while ensuring consistent friction reduction.
Solution Approach 2:
The cable jacket serves itself by providing built-in friction reduction through the integrated composition. The polymerized silica and mineral oil in the jacket material automatically reduce friction during installation without requiring external lubrication systems or manual intervention, making the cable self-sufficient for easy installation.
3Force
If external lubricating materials are sprayed onto cooled wire and cable, then friction is reduced, but additional materials are required on-site and aesthetic quality may be affected
Solution Approach 1:
The patent merges the structural jacket function with the friction-reduction function by incorporating polymerized silica, mineral oil, and lubricants directly into the jacket composition. This consolidation eliminates the need for separate external lubricating materials, reducing on-site material requirements while maintaining consistent friction reduction and aesthetic quality.
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 method significantly reduces the pulling force required to install electrical cables through conduits and building structures, enhancing installation efficiency while maintaining product quality and aesthetics.
Implementation Method 1
a polymerized jacket composition comprises a predetermined amount by weight of nylon; a predetermined amount of commercially available mineral oil in the range of 0.1% to 5% by weight, and a predetermined amount of commercially available and synthetically produced, amorphous silica that exhibits high porosity and high purity in the range of 2% to 9% by weight, wherein the silica and mineral oil are polymerized with nylon
Data Source
AI summary
A process for manufacturing finished wire and cable having reduced coefficient of friction and pulling force during installation, includes providing a payoff reel containing at least one internal conductor wire; supplying the at least one internal conductor wire from the reel to at least one extruder; providing the least one extruder, wherein the least one extruder applies an insulating material and a polymerized jacket composition over the at least one internal conductor wire, wherein the polymerized jacket composition comprises a predetermined amount by weight of nylon; a predetermined amount by weight of mineral oil in the range of 0.1% to 5% by weight; and a predetermined amount of silica in the range of 2% to 9% by weight; providing a cooling device for lowering the temperature of the extruded insulating material and the polymerized jacket composition and cooling the insulating material and the polymerized jacket composition in the cooling device; and, reeling onto a storage reel the finished, cooled, wire and cable for storage and distribution.