Microduct Optical Cable Sheath Composition for Longer Air-Blowing
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Solution Overview
Problem
Existing optical cables face challenges in achieving excellent air-blowing performance into microducts, particularly for long distances, due to issues with weight, hardness, and slidability, which affect installation costs and efficiency in microduct system construction methods.
Innovation Solution
The optical cable features a sheath layer with a density of 1.0 g/cm3 or less, primarily composed of polyethylene with a density of 0.92 g/cm3 or greater, containing silicone with a weight-average molecular weight of 50,000 to 1,000,000, and a content ratio of 0.5% to 10% by mass, enhancing hardness, slidability, and air-blowing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the sheath layer density is reduced to improve air-blowing performance, then the weight is reduced and blowing distance is increased, but the hardness may deteriorate
Solution Approach 1:
The sheath layer uses a composite material system consisting of polyethylene as the base resin and silicone as the additive. This composite structure allows the sheath to achieve both low density (0.92-0.96 g/cm³) for reduced weight and maintained hardness through the synergistic effect of the two materials, resolving the contradiction between weight reduction and hardness maintenance.
Solution Approach 2:
The patent optimizes the silicone content ratio parameter within the range of 0.5-10% by mass and controls polyethylene density within 0.92-0.96 g/cm³. By carefully adjusting these parameters, the sheath layer achieves the optimal balance between weight reduction and hardness maintenance, enabling both improved air-blowing performance and sufficient mechanical strength.
2Ease of operation
If the sheath layer composition is modified to improve slidability, then the air-blowing performance is improved, but the manufacturing complexity may increase
Solution Approach 1:
The patent simplifies the composition by specifying clear parameter ranges: polyethylene density of 0.92-0.96 g/cm³ and silicone content of 0.5-10% by mass. These defined parameters make the formulation straightforward for manufacturing while achieving the desired slidability, avoiding excessive complexity in the composition design.
3Length of stationary object
If the optical cable is designed for long-distance air-blowing installation, then the blowing distance is increased, but the installation cost may increase
Solution Approach 1:
By optimizing the sheath layer density (0.92-0.96 g/cm³) and composition (silicone content 0.5-10%), the cable achieves improved air-blowing performance that enables long-distance installation. The controlled material parameters ensure efficient blowing throughout the entire cable length, reducing the need for multiple installation stages and thereby controlling installation costs despite the increased blowing distance.
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 cable achieves improved air-blowing performance into microducts by reducing weight, increasing hardness, and improving slidability, thereby increasing blowing distance and reducing installation costs.
Implementation Method 1
The sheath layer contains silicone. The silicone has a weight-average molecular weight of 50,000 to 1,000,000. A content ratio of the silicone in the sheath layer is 0.5% by mass to 10% by mass.
Data Source
AI summary
The optical cable according to an embodiment of the present disclosure is for laying thereof in a microduct, the optical cable being provided with an assembly core that accommodates one or more optical fiber cores, and a sheath layer that covers an outer periphery of the assembly core, the density of the sheath layer being 1.0 g/cm3 or less, a main component of the sheath layer being polyethylene, the sheath layer containing silicone, the density of the polyethylene being 0.92 g/cm3 or greater, the weight-average molecular weight of the silicone being 50,000-1,000,000, and the content ratio of the silicone in the sheath layer being 0.5-10 mass %.