Core Rod Cleaning Sleeves for Optical Fiber Preforms
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Solution Overview
Problem
Conventional rod-in-tube (RIT) optical fiber preform manufacturing is inefficient and costly due to the need for manual handling of core rods, which can lead to contamination and reduced quality, especially when multiple core rods require welding and deep etching with HF acid for water removal.
Innovation Solution
A method involving elongated sleeves to load and clean multiple core rods simultaneously, using a fluid delivery system to etch and clean the rods without direct contact, allowing for automated insertion into overclad tubes, reducing contamination risks and manufacturing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple core rods are processed individually with manual handling, then each rod can be handled with care, but manufacturing time and costs increase significantly
Solution Approach 1:
The invention divides the core rods into groups, with multiple rods (e.g., 6 rods) placed in separate sleeves. Each sleeve can be processed independently through the cleaning and etching system, allowing parallel processing of multiple rods simultaneously. This segmentation enables batch processing while maintaining individual rod protection and quality control.
Solution Approach 2:
The cleaning and etching system is designed with a universal multi-functional capability to handle multiple sleeves containing core rods. A single fluid delivery system can service multiple sleeves simultaneously, performing both cleaning and HF acid etching operations on multiple rods in parallel, thereby significantly improving manufacturing efficiency.
2Manufacturing precision
If core rods are deeply etched with HF acid to remove surface water, then water peak quality is maintained, but contamination risk increases with manual handling
Solution Approach 1:
The invention introduces sleeves as intermediary containers that hold the core rods during cleaning and etching operations. These sleeves act as barriers between the rods and the external environment, preventing direct manual contact and associated contamination. The sleeves can be sealed to create isolated environments for HF acid etching, ensuring water peak quality while eliminating contamination risks from hand contact.
Solution Approach 2:
The invention replaces manual mechanical handling with an automated fluid-based system. Instead of workers manually handling rods for cleaning and etching, a fluid delivery system automatically circulates cleaning solutions and HF acid through the sleeves containing the rods. This substitution eliminates the contamination pathway introduced by manual handling while maintaining the necessary chemical processing for water peak quality.
3Productivity
If core rods are welded end to end to form continuous length, then multiple rods are joined, but hydroxyl concentration increases at weld locations
Solution Approach 1:
The invention employs disposable or single-use sleeves for each core rod during the preform assembly process. These sleeves are inexpensive and can be discarded after use, eliminating the need for complex, expensive welding operations to join rods. By using separate sleeves for each rod that are simply stacked axially within the overclad tube, the system achieves rod continuity without the hydroxyl contamination introduced by welding heat sources.
4Object-affected harmful factors
If handles are removed from core rods before insertion, then contamination is reduced, but additional processing steps and costs are incurred
Solution Approach 1:
The invention extracts the handle function from the core rod itself by placing the rods inside protective sleeves. The sleeves serve as the handling interface instead of requiring handles attached to the rods. This extraction eliminates the need for handle removal steps while maintaining contamination-free handling, as the sleeves can be gripped and manipulated without exposing the rod surfaces to contamination.
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 method significantly reduces manufacturing time and costs by enabling efficient, contamination-free cleaning and etching of multiple core rods, maintaining high product quality and reducing hydroxyl concentration issues at weld locations.
Implementation Method 1
fluids supplied from the system enter the first sleeves and contact exposed surfaces of the core rods to clean and/or etch the rods
Data Source
AI summary
Core rods or other glass components associated with optical fiber preforms are cleaned by loading them into a number of first sleeves, and partially obstructing entrance and exit ends of the sleeves to retain the components. The sleeves are contained inside a second sleeve so that the entrance ends of the first sleeves face an entrance end of the second sleeve. A fluid delivery system supplies cleaning fluids to the entrance end of the second sleeve, so that the fluids enter the first sleeves and contact exposed surfaces of the loaded components. The fluids leave the exit ends of the first sleeves and purge from an exit end of the second sleeve. Separators may be placed between the components in the first sleeves to enhance cleaning action and to cushion adjacent end faces of the components. Cleaned components may be unloaded from the first sleeves without risk of contamination.