Blown Optical Fiber Unit Two-Layer Resin Coating
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Solution Overview
Problem
Existing blown optical fiber units face challenges with access to optical fibers due to embedded particulate material and have issues with installation performance, including high friction and flexibility, which affects ease of installation and fiber accessibility.
Innovation Solution
A two-layer resin system is applied over optical conductors, with a thermoplastic polymer sheath in close contact with the outer resin layer, eliminating particulate material and gaps to enhance air-blown installation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particulate material (glass beads) is embedded in the outer harder layer, then blowing performance is improved, but access to optical fibers becomes difficult
Solution Approach 1:
The invention extracts and removes the particulate material (glass beads) from the outer harder layer, eliminating the obstacle to fiber access while preserving the structural integrity and blowing performance through the resin-based composition
2Ease of operation
If a gap is present between the outer layer and inner layer, then ease of fiber extraction is improved, but installation performance deteriorates due to high friction and flexibility
Solution Approach 1:
The invention changes the physical and mechanical parameters of the outer harder layer by adjusting resin composition, crosslinking density, and hardness to achieve optimal balance between fiber extractability and installation performance, eliminating the need for gaps
3Ease of operation
If the outer layer is made softer to improve fiber access, then ease of operation is improved, but installation performance worsens due to increased flexibility and friction
Solution Approach 1:
The invention applies local quality by creating distinct functional zones within the coating structure: the outer harder layer provides installation stability and low friction, while the inner softer layer facilitates fiber access and protection, with each layer optimized for its specific function
Data Source
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AI summary
It is disclosed an optical fiber unit for air-blown installations comprising a number of optical conductors (2), a first layer (3i) of resin material, a second layer (3o) of resin material radially outer to the first layer (3i) of resin material and a sheath (4) of a thermoplastic material, wherein said second layer (3o) of resin material has a Secant Modulus higher than a Secant Modulus of said first layer (3i) of resin material and wherein said sheath (4) of a thermoplastic material is over and in close contact with said second layer (3o) of resin material.