Intermittent Bonded Ribbon Production Line Guide
An intermittent bonded ribbon production line connects fiber subunits at set intervals. Fibers remain organized for mass-fusion splicing, while the ribbon can roll into a compact cable shape. Flexible ribbon cable production is supported by this design while maintaining efficient fiber handling.
In some processes, bonding material is applied while the subunit coating is still uncured. The materials can diffuse across their interface and cure together. One commercial example is Prysmian’s FlexRibbon technology, whose original design the company says dates to 2018. Together, these methods demonstrate the connection between optical fiber ribbon manufacturing and fiber optic bonding.
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Understanding What An Intermittent Bonded Fiber Ribbon Is
Optical fibers are grouped into small subunits in an intermittent bonded fiber ribbon. The subunits stay organized for splicing while remaining able to change shape to sit inside a cable.
The Arrangement Of Fiber Subunits And Intermittent Bonds
Each adjacent pair or group of fibers is held together by a coating. These optical fiber subunits connect to neighboring subunits at spaced bond points rather than along their full length. Six two-fiber subunits may make up a 12-fiber design. The configurations range from 4 to 36 fibers, and bond spacing ranges from 10 to 1,000 millimeters.
Intermittent Bonded Ribbon Production Line
Differences Between Rollable Ribbons And Conventional Flat Ribbons
A conventional flat ribbon keeps its fibers in a single fixed plane. A rollable fiber ribbon can fold between bonds while retaining fiber alignment for mass-fusion splicing. Bending and folding are supported by the small bonding points used in Prysmian’s FlexRibbon.
How Flexible Ribbons Enable Compact, High-Density Cables
Inside a high-density fiber cable, a flexible ribbon can occupy less space. Cable designers can therefore accommodate more fibers in a compact structure without sacrificing an organized fiber layout.
Intermittent Bonded Ribbon Production Line: Process And Equipment
The intermittent bonded ribbon production process places optical fibers side by side along the ribbon’s length. A first material coats groups of two or more fibers to form subunits. A second material joins neighboring subunits at spaced points and leaves flexible sections between the bonds.
Organize Adjacent Optical Fibers Into Subunits
Fibers are placed beside one another according to the planned ribbon layout. Each selected group becomes a subunit when the first coating material encases and holds its fibers together.
Deposit Subunit Coating And Intermittent Bonding Material
Fiber ribbon coating creates the subunits. Bonding material is applied by a discrete coating applicator between neighboring subunits at spaced intervals, not continuously along their full length.
Create Diffusion Zones Through Wet-On-Wet Application
During wet-on-wet bonding, the subunit coating remains unset when bonding material is applied. A diffusion zone develops as the materials diffuse through their shared interface.
Set The Subunit Coating And Bonds In One Cure
A single curing step sets both the subunit coating and the intermittent bonds. Although optical fiber ribbon equipment is used for these operations, the complete equipment list, line speed, and production capacity are not provided.
| Production Stage | Material Or Action | Purpose |
|---|---|---|
| Fiber arrangement | Arrange fibers next to one another | Set the ribbon layout |
| Subunit formation | Coat fiber groups with the first coating material | Keep groups of two or more fibers together as subunits |
| Intermittent bonding | Apply the second material between adjacent subunits | Connect subunits at separated bond points |
| Wet-on-wet bonding interface | Apply bonds before the subunit coating cures | Allow materials to form a diffusion zone |
| Joint curing step | Set the coating and bonds together in one step | Cure the assembled ribbon structure |
Key Production Line Stages And Process Controls
Fiber ribbon production stages take place in a set sequence. Workers arrange fibers into subunits, apply a subunit coating, add intermittent bonds between adjacent subunits, and then cure both together. Optical fiber coating application and bond placement must correspond to the ribbon design.
Gaps of 5 to 100 micrometers between subunits are given in example designs. A range of 10 to 1,000 millimeters is specified for intermittent bond spacing in example designs. Some bond deposits take a diamond-like shape, tapering at the ends and widening in the center. These are disclosed examples, not fixed settings for every production line.
The selected materials, bond layout, and curing method determine ribbon manufacturing process control. The source material does not specify line speeds, curing temperatures, or inspection intervals, so these values must not be inferred.
Materials, Bond Design, And Ribbon Flexibility
Material selection and bond layout govern how the ribbon behaves during cable making and splicing. Each fiber is protected by coatings that still allow the subunits to flex as designed.
Choose Compatible Coating And Bonding Materials
Because subunit coatings and ribbon bonding materials serve separate roles, they do not have to share the same formula. A gradual interface can be created by resins that intermix or remain at least partly soluble. Intermixing may also be encouraged by lower coating viscosity.
A diffusion zone forms at this interface, with properties that change gradually. The zone may differ in color, stiffness, surface friction, tear strength, or stretch. Disclosed thicknesses extend from 2 to 50 micrometers, with 5 to 15 micrometers representing a narrower range.
Manage Bond Placement, Spacing, And Geometry
Bond spacing controls where fiber subunits stay connected and where they can move freely. Intermittent bond geometry provides unbonded spans between bond points. Some bond surfaces have a saddle shape made by intersecting convex and concave curves.
Maintain Fiber Organization While Balancing Ribbon Flexibility
Unbonded spans allow the ribbon to shift from a flat layout into a rolled, curled, or folded shape. During cable installation, a flexible fiber ribbon can flex without disrupting the fiber organization needed for splicing.
Quality Checks To Maintain Consistent Ribbon Production
Reliable fiber ribbon quality checks evaluate defined features rather than relying on assumed pass limits. The patent identifies design factors such as bond spacing, subunit gaps, diffusion-zone thickness, and bond shape. The patent does not, however, define inspection methods or acceptance limits.
Inspect Bond Continuity And Subunit Alignment
Verify that intermittent bonds join adjacent subunits at the intended positions, with unbonded lengths between them. Subunit alignment and gaps require review because shifts may change ribbon shape and bond geometry.
Evaluate Ribbon Flexibility And Rollability
To evaluate ribbon rollability, watch whether it bends and gathers while keeping fibers in their original order. Compare bond spacing and flexibility across the overall ribbon design. Treat these comparisons as design checks rather than general production tolerances.
Confirm Fiber Identification And Ribbon Configuration
Use fiber color coding to confirm the position of each fiber. A common 12-color sequence is blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, and aqua. The color sequence may repeat when a ribbon has more than 12 fibers.
Applications, Cable Integration, And Splicing Benefits
Intermittently bonded ribbons can roll inside a cable, enabling more fibers to fit into a compact design. Prysmian says FlexRibbon supports high-density ribbon cable designs, smaller diameters, and improved fiber duct utilization.
Enable High-Density Cable Designs And Better Duct Utilization
For indoor, outdoor, and indoor/outdoor applications, Prysmian offers FusionLink and MassLink with FlexRibbon. Dry water blocking is used in FusionLink, which comes with either 250 μm or 200 μm ribbon. Under NESC Heavy loading conditions, EcoSpan aerial cable can support spans of up to 300 feet. As a small-diameter outdoor option, FlexDrop can support up to two 12-fiber ribbons.
Support Mass-Fusion Splicing And Quicker Deployment
Mass-fusion splicing joins several ribbon fibers in a single operation, often 12 at once. This approach may reduce splice time where ribbon routes are compatible. For loose-tube cable connections, technicians separate the ribbon fibers and splice them one by one using a single-fiber splicer.
Review Indoor, Outdoor, Access, And Broadband Applications
Ribbon cable is used in point-to-point networks, indoor FTTH systems, MTP wiring-box links, and urban trunk routes. Choosing indoor and outdoor fiber cable to suit the route matches its construction with building, aerial, and underground requirements.
Final Conclusions
An intermittent bonded ribbon line guide brings together fiber layout, bond placement, curing, and inspection. The process produces a flexible optical fiber ribbon that stays organized for handling while rolling or folding into compact cable designs.
In this process, bonds are applied before the subunit coating cures. The materials create a diffusion zone before curing together. Reliable fiber cable manufacturing is encouraged by careful control at every stage.
Flexible ribbons also support mass-fusion ribbon splicing, allowing crews to join multiple fibers at once. FlexRibbon is described by Prysmian as suitable for various cable designs, including compact configurations with up to 6,912 fibers.
Manufacturers and network planners need to manage fiber alignment, bond strength, and rollability. This balance may make cable packaging easier while ensuring ribbons remain prepared for efficient installation and splicing.
