Optical Fiber Cable Rectangular Jacket Low Friction Insertion
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Solution Overview
Problem
Existing optical fiber cables face difficulties in being inserted into electric conduits with many curved portions due to high friction coefficients and bending rigidity issues, leading to increased costs and complexity in laying multiple cables without using insert tools.
Innovation Solution
An optical fiber cable with a rectangular cross-sectional outer jacket having a friction coefficient ≤0.20 and Shore D hardness ≥60, along with a bending rigidity of ≥1.3×10−3 N·m2 in the short side direction, allowing for easy push-insertion without lubricants or tools, and enabling efficient bundling and simultaneous insertion of multiple cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional optical fiber cables with high friction coefficient outer jackets are used, then the cables can be easily handled and installed, but they cannot be efficiently inserted into electric conduits with curved portions without lubricants or insert tools
Solution Approach 1:
The outer jacket material parameters are changed to achieve a friction coefficient of 0.20 or less and Shore D hardness of 60 or more. This parameter optimization allows the cable to be inserted into conduits with curved portions without requiring lubricants or complex insert tools, directly resolving the contradiction between ease of insertion and process complexity
Solution Approach 2:
The outer jacket is made from composite materials or specially formulated resin compositions that simultaneously achieve low friction coefficient (≤0.20) and high hardness (Shore D ≥60). This composite material approach allows the cable surface to resist adhesion to conduit walls while maintaining structural integrity, enabling tool-free insertion without requiring additional lubrication steps
2Productivity
If multiple optical fiber cables are laid separately into electric conduits, then each cable can be installed individually, but the construction time and cost increase significantly
Solution Approach 1:
Multiple optical fiber cables are bundled together into a single assembly with a common outer jacket structure. This merged configuration allows all cables to be inserted into the electric conduit simultaneously as one unit, dramatically improving productivity and reducing the time loss associated with multiple separate insertion operations
Solution Approach 2:
Multiple cables are nested within a shared outer jacket structure, forming a compact bundled assembly. This nesting arrangement allows the entire group of cables to be inserted through the conduit in a single operation, eliminating the need for repeated insertion processes for each individual cable
3Shape
If the outer jacket material is made soft and flexible, then the cable can be bent easily during installation, but it adheres to the conduit wall and becomes difficult to insert
Solution Approach 1:
The outer jacket material parameters are precisely optimized to achieve Shore D hardness of 60 or more while maintaining appropriate bending flexibility. This parameter change ensures the cable is stiff enough to resist adhesion to conduit walls during insertion, yet flexible enough to navigate curved portions when properly inserted
Solution Approach 2:
The outer jacket exhibits different local properties: the surface layer has high hardness (Shore D ≥60) and low friction to prevent adhesion to conduit walls, while the bulk material maintains flexibility for bending during installation. This local quality differentiation resolves the contradiction between flexibility and insertion ease
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 optical fiber cable can be efficiently inserted into electric conduits with curved portions without tools, reducing insertion time and potential damage, while allowing for multiple cables to be laid in a compact space, thus lowering construction costs and improving network deployment efficiency.
Implementation Method 1
a frictional coefficient of the outer jacket is equal to or less than 0.20
Implementation Method 2
Shore D hardness of the outer jacket is equal to or more than 60
Implementation Method 3
an optical fiber composed of a plastic coated optical fiber, a tight-buffered optical fiber or an optical ribbon fiber
Data Source
AI summary
An optical fiber cable includes an elongated optical element portion having an optical fiber, a pair of tensile strength members and an outer jacket. The optical fiber is composed of one or more plastic coated optical fibers, tight-buffered optical fibers or optical ribbon fibers. The pair of tensile strength members is arranged in parallel at both sides of the optical fiber in a width direction of the optical fiber. The outer jacket covers outer circumferences of the optical fiber and the pair of tensile strength members. A frictional coefficient of the outer jacket is equal to or less than 0.20. Shore D hardness of the outer jacket is equal to or more than 60.