Bare Optical Fiber Coating Device with Segmented Resin Supply
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Solution Overview
Problem
Conventional resin coating devices face challenges in maintaining uniform coating thickness and preventing thickness deviation and variations in the optical fiber's diameter during high-speed drawing, leading to uneven coating quality.
Innovation Solution
The proposed solution involves a bare optical fiber coating device with separate resin circulation chambers and supply passages, optimized in size and pressure, to stabilize the resin flow and minimize eccentricity, ensuring uniform coating even at high drawing speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high drawing speed is used to increase productivity, then manufacturing efficiency is improved, but coating uniformity deteriorates due to resin flow instability and thickness deviation
Solution Approach 1:
The resin supply system is segmented into multiple independent supply passages (first resin supply passage, second resin supply passage, etc.) that independently supply resin to different regions of the coating die. This segmentation allows each passage to be optimized for specific flow requirements, stabilizing resin circulation even at high drawing speeds and preventing thickness deviation in the coating layer.
Solution Approach 2:
Different regions of the coating die are provided with locally optimized resin supply characteristics through separate supply passages. Each passage can be designed with specific dimensions, positions, and flow characteristics tailored to the local requirements of that region, ensuring uniform resin distribution and coating thickness across the entire fiber surface during high-speed drawing.
2Manufacturing precision
If resin circulation chamber size is increased to improve resin flow stability, then coating uniformity is improved, but device complexity increases
Solution Approach 1:
Multiple resin supply passages and circulation chambers are merged into an integrated coating die structure. The supply passages are arranged concentrically or in specific patterns within the die, combining multiple functions (resin supply, circulation, and coating) into a single unified component, thereby improving coating uniformity without proportionally increasing overall device complexity.
Solution Approach 2:
The resin supply passages are nested within the coating die structure, with inner passages positioned concentrically around the optical fiber path and outer passages arranged in subsequent layers. This nested arrangement allows efficient use of space, stabilizing resin flow through adequate circulation chamber sizes while maintaining a compact overall device structure.
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
This configuration effectively minimizes thickness deviation and variations in the optical fiber's diameter, achieving stable and uniform coating quality by stabilizing the resin flow and circulation, even at high drawing speeds.
Implementation Method 1
a first resin circulation chamber that includes the nipple and the intermediate die, is formed between the nipple hole and the intermediate die hole in an annular shape surrounding the bare optical fiber passing through the nipple hole, and is configured to circulate liquid resin
Data Source
AI summary
A bare optical fiber coating device includes: a nipple having a nipple hole through which a bare optical fiber is inserted vertically from above; an intermediate die that has an intermediate die hole through which the bare optical fiber passing through the nipple hole is inserted and that is disposed vertically below the nipple; a first coating die that has a first coating die hole through which the bare optical fiber passing through the intermediate die hole is inserted and that is provided vertically below the intermediate die; and a first resin circulation chamber that is formed by the nipple and the intermediate die, is formed between the nipple hole and the intermediate die hole in an annular shape surrounding the bare optical fiber passing through the nipple hole, and is configured to circulate liquid resin.