Binder Film System for Fiber Optic Cable Production
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Solution Overview
Problem
The existing binder yarn systems in fiber optic cable manufacturing limit the length of cable production, cause attenuation of optical fibers due to stress concentrations, and slow down the manufacturing process, as they constrain buffer tubes in a way that leads to axial migration and distortion, necessitating frequent line stops and material changes.
Innovation Solution
A binder film system is introduced that surrounds the core of the fiber optic cable, applying radial tension to constrain buffer tubes and prevent axial migration, using a thin, polymeric film with super-absorbent powder particles to maintain coupling with the central strength member and reduce the need for binder yarns and water-blocking tape, allowing for continuous production and improved optical fiber integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binder yarns are used to constrain buffer tubes, then the buffer tubes are constrained in the reversals, but the manufacturing line must be stopped every 20 kilometers to switch out bobbins, reducing efficiency
Solution Approach 1:
The patent replaces traditional binder yarns with a thin polymeric film that wraps around the core elements. This film is extruded continuously during manufacturing, eliminating the need for discrete binder yarn bobbins that require frequent changing. The film maintains the constraining function while enabling continuous production without line stops.
2Reliability
If binder yarns are used to constrain buffer tubes, then the buffer tubes are constrained, but binder yarns impart distortions or stress concentrations in the stranded buffer tubes, potentially resulting in attenuation of optical fibers
Solution Approach 1:
The thin polymeric film provides a uniform, continuous constraining surface that eliminates the point-loading and distortion issues caused by discrete binder yarns. The film distributes stress evenly across the buffer tubes, preventing stress concentrations that would cause optical fiber attenuation while maintaining necessary constraint.
Solution Approach 2:
The patent replaces the mechanical binder yarn system with a polymeric film system that is extruded and bonded in place. This substitution eliminates the need for separate binder yarn components and their associated installation and tensioning mechanisms, reducing complexity and improving optical fiber integrity.
3Reliability
If binder yarns are used to constrain buffer tubes, then the buffer tubes are constrained, but application of binder yarns may limit the speed of a stranding machine, depending upon allowable binder-yarn tension
Solution Approach 1:
The patent replaces the binder yarn tensioning system with a polymeric film extrusion system. The film is applied continuously during stranding at high speeds, with the extrusion and bonding process integrated into the manufacturing line. This eliminates the speed limitations imposed by binder yarn tension application and allows the stranding machine to operate at optimal speeds.
4Reliability
If binder yarns are used to constrain buffer tubes, then the buffer tubes are constrained, but the finite lengths of binder yarns on a bobbin limit the length of cable that can be manufactured without stopping the manufacturing line
Solution Approach 1:
The patent implements continuous film extrusion during the manufacturing process, allowing the binder film to be applied without interruption. This continuous action eliminates the need to stop the manufacturing line to change binder yarn bobbins, maintaining production continuity and eliminating time losses associated with material changes.
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 binder film system enables continuous cable production, reduces optical fiber attenuation, and enhances manufacturing efficiency by maintaining coupling with the central strength member, preventing axial migration, and eliminating the need for frequent line stops and material changes.
Implementation Method 1
The binder film is in radial tension around the core such that the binder film opposes outwardly transverse deflection of the core elements
Implementation Method 2
the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling therebetween, limiting axial migration of the core elements relative to the central strength member
Implementation Method 3
using a thin, polymeric film with super-absorbent powder particles to maintain coupling with the central strength member
Data Source
AI summary
A fiber optic cable includes core elements wound in a pattern of stranding, the core elements comprising tubes surrounding optical fibers. The fiber optic cable further includes an binder film surrounding the stranded core elements. The binder film is continuous peripherally around the core elements, forming a continuous closed loop when viewed in cross-section, and continuous lengthwise along a length of the cable that is at least a meter. Further, the binder film is in radial tension and opposes outwardly transverse deflection of the core elements.