Optical Fiber Ribbon Stripability via UV-Curable Ink Formulation
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Solution Overview
Problem
Optical fiber ribbons face challenges with strip cleanliness and tube-off during splicing operations due to inadequate curing of marking inks, leading to increased surface friction, debris, and labor-intensive cleaning processes, which are not adequately addressed by focusing solely on the properties of the matrix material.
Innovation Solution
The development of optical fiber ribbons with coatings and matrix materials having compatible thermal-mechanical properties, including similar glass transition temperatures and fracture toughness, and the use of ink formulations with high acrylate conversion rates to ensure efficient curing and reduced debris during stripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional marking inks with slow cure speeds are used, then the inking process can be performed, but the ink remains under-cured leading to increased surface friction, poor ribbon peel performance, and debris during stripping
Solution Approach 1:
The patent changes the chemical composition parameters of the marking ink by incorporating specific photoinitiators (e.g., Irgacure 184, Irgacure 369) and monomers (e.g., cyclohexyl acrylate, caprolactam monomer) that enable rapid UV curing. This parameter change transforms the ink from slow-curing to fast-curing, achieving complete curing before ribbon formation and eliminating the harmful effects of under-cured ink such as high surface friction and debris generation during stripping operations
Solution Approach 2:
The patent replaces conventional slow-drying or thermal-curing ink systems with a UV photopolymerization system. The UV-curable ink undergoes rapid chemical transformation when exposed to UV light, substituting the mechanical drying process with a photochemical curing mechanism. This substitution achieves complete curing in seconds rather than minutes or hours, preventing the ink from remaining tacky or under-cured and causing friction and debris issues
2Use of energy by moving object
If UV lamp intensity is reduced or quartz tube becomes dirty, then less UV light is available for curing, but this results in low degree of cure on the inked fiber and poor strip performance
Solution Approach 1:
The patent employs photoinitiators that are highly sensitive to UV light and can initiate rapid polymerization even under reduced UV intensity conditions. The system is designed with sufficient photoinitiator concentration and appropriate spectral match between the UV lamp and photoinitiator absorption characteristics, creating a preliminary condition that ensures complete curing even when UV light availability fluctuates due to lamp aging or quartz tube contamination
Solution Approach 2:
The patent uses a composite photoinitiator system combining multiple photoinitiators with different absorption characteristics (e.g., Irgacure 184 for 365nm, Irgacure 369 for 395nm) to broaden the UV absorption spectrum. This composite approach ensures that a wider range of UV wavelengths can effectively initiate curing, maintaining curing completeness even when the UV lamp output decreases or the spectral distribution changes over time
3Productivity
If ink cure speed is increased, then robust process performance is achieved, but this requires specific ink formulations that may increase manufacturing complexity
Solution Approach 1:
The patent optimizes the ink formulation parameters by selecting photoinitiators and monomers that provide fast curing with commercially available UV lamps. The formulation includes specific ratios of monomers (e.g., cyclohexyl acrylate, caprolactam monomer) and photoinitiators that achieve rapid polymerization without requiring exotic or custom-synthesized chemicals. This parameter optimization enables fast curing while maintaining ease of manufacture through the use of readily available materials and standard formulation procedures
Solution Approach 2:
The patent uses monomers such as N-vinyl caprolactam as intermediaries that facilitate rapid curing by acting as reactive diluents and chain transfer agents. These intermediary substances enable the photopolymerization reaction to proceed rapidly while maintaining appropriate viscosity and handling properties. The intermediaries bridge the gap between the photoinitiator and the polymer network formation, achieving fast cure speeds without requiring complex multi-component systems or specialized manufacturing processes
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 approach results in improved strip cleanliness and tube-off performance, reducing labor and costs associated with cleaning and maintaining the integrity of the optical fibers during splicing operations across a range of temperatures and conditions.
Implementation Method 1
Photoinitiators are used to initiate the polymerization process when the inks are exposed to UV light during the inking process
Data Source
AI summary
An optical fiber ribbon includes a plurality of optical fibers encapsulated within a matrix material, where the optical fiber coating(s) and the matrix material(s), and optionally any ink layers thereon, are characterized by compatible chemical and/or physical properties, whereby the fiber coating and matrix and any ink layers therebetween can be reliably stripped from the optical fibers to afford a suitable strip cleanliness. Novel ink formulations that can be used in the making of such fiber optic ribbons, methods of making such ribbons, and their use are also described.