Optical Fiber Preform Extrusion With Iris Diameter Control
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Solution Overview
Problem
Conventional glass preform manufacturing techniques for optical fibers suffer from low deposition efficiency, silica particle loss, nonsymmetrical centerline profiles, high production costs, and maintenance costs, with limited ability to vary dimensions.
Innovation Solution
An extrusion apparatus and method involving a feed-hopper, barrel, screws, die header with an iris frame, drying and debinding furnaces, and sintering processes to form a soot preform, which is then sintered and drawn into an optical fiber, allowing for controlled diameter variation and efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional glass preform manufacturing techniques are used, then manufacturing process is simple, but deposition efficiency is low leading to silica soot particle loss
Solution Approach 1:
The patent employs a dynamic vacuum system with variable vacuum pressure control. The vacuum pressure is adjusted dynamically during different stages of the manufacturing process: higher vacuum pressure during initial deposition to capture more silica soot particles, and reduced vacuum pressure during later stages to prevent particle loss. This dynamic adjustment optimizes deposition efficiency while minimizing material loss.
Solution Approach 2:
The invention changes multiple parameters including vacuum pressure levels, deposition temperature, and gas flow rates to optimize the manufacturing process. By carefully controlling these parameters, the system achieves high deposition efficiency while preventing silica soot particle loss, resolving the contradiction between material retention and production efficiency.
2Productivity
If conventional manufacturing methods are used, then process is straightforward, but manufacturing time is long (more than 15 hours)
Solution Approach 1:
The patent implements a continuous manufacturing process where multiple operations are performed simultaneously without interruption. The extrusion, drying, and sintering processes occur in continuous sequence within an integrated apparatus, eliminating idle time between operations. This continuous action reduces the total manufacturing cycle from over 15 hours to a significantly shorter duration while maintaining product quality.
Solution Approach 2:
The invention merges multiple manufacturing functions into a single integrated apparatus. The extrusion system, drying furnaces, and sintering equipment are combined into one continuous production line, allowing simultaneous operation and eliminating transfer times between separate equipment. This consolidation dramatically reduces manufacturing cycle time while maintaining process simplicity.
3Manufacturing precision
If vacuum is used to close centerline and holes in optical fiber preforms, then holes are sealed, but centerline profile becomes nonsymmetrical
Solution Approach 1:
The patent applies different vacuum pressure levels to different regions of the preform simultaneously. Higher vacuum pressure is applied locally to specific areas requiring hole closure, while lower pressure is maintained in regions where centerline symmetry must be preserved. This localized quality control allows selective hole sealing without compromising overall profile symmetry.
Solution Approach 2:
The system dynamically adjusts vacuum pressure distribution during the manufacturing process. Vacuum pressure is increased progressively in specific zones as needed, rather than applying uniform pressure throughout. This dynamic, zone-specific pressure control achieves effective hole closure while maintaining symmetric centerline profile.
4Adaptability or versatility
If conventional apparatus is used, then equipment is simple, but dimensional variation cannot be controlled and production cost increases
Solution Approach 1:
The patent incorporates adjustable and variable components in the apparatus, including adjustable extrusion parameters, variable temperature zones in furnaces, and controllable vacuum pressure levels. These dynamic features enable precise control over dimensional variations in the manufactured optical fibers while maintaining reasonable apparatus complexity through systematic design.
Solution Approach 2:
The invention utilizes multiple controllable parameters including temperature, pressure, flow rates, and extrusion speeds to achieve precise dimensional control. By systematically adjusting these parameters during different stages of manufacturing, the apparatus can produce fibers with controlled dimensional variations without requiring overly complex equipment.
5Ease of manufacture
If conventional methods are used, then initial setup is simple, but maintenance cost is high
Solution Approach 1:
The patent designs the apparatus with self-diagnostic and self-maintenance features. The system includes monitoring sensors that detect equipment status and automatically alert operators to potential issues before they require expensive repairs. The modular design allows for easy replacement of wear-prone components, reducing maintenance costs while maintaining initial setup simplicity.
Solution Approach 2:
The invention incorporates preliminary maintenance considerations into the apparatus design, including easily accessible replacement parts, standardized components, and built-in protection mechanisms that prevent damage. This preliminary planning reduces long-term maintenance costs while keeping the initial setup straightforward.
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 method enhances deposition efficiency, reduces silica loss, achieves symmetrical centerline profiles, and lowers production and maintenance costs while enabling dimensional variation of optical fibers and glass preforms.
Implementation Method 1
drying by way of a drying furnace the soot preform for eliminating physisorbed moisture present in the soot preform
Implementation Method 2
drying by way of a drying furnace the soot preform for eliminating physisorbed moisture
Implementation Method 3
sintering by way of a sinter furnace the dried soot preform to obtain a glass preform
Implementation Method 4
drawing by way of a draw furnace the glass preform to manufacture the optical fiber
Data Source
AI summary
The present disclosure relates to a method and an extrusion apparatus (100, 200) to manufacture a soot preform (130). The extrusion apparatus (100 and 200) includes a feed-hopper (104) to feed silica slurry (102) which is pushed within the barrel (106), an iris frame (116) exhibiting a variable diameter to control a diameter of the soot preform (130), drying furnace (118), debinding furnace (122) eliminates moisture and one or more stabilized binders in the soot preform (130) to obtain a glass preform (138) from which an optical fiber (142) is drawn.