Intermittent Bonded Ribbon Production Line Guide
At defined intervals, an intermittent bonded ribbon production line joins fiber subunits. 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 preserving efficient fiber handling.
Some processes apply bonding material before the subunit coating cures. The materials can diffuse across their interface and cure together. Prysmian’s FlexRibbon technology provides one commercial example, and the company dates its original design to 2018. Together, these methods demonstrate the relationship between optical fiber ribbon manufacturing and fiber optic bonding.
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Understanding What An Intermittent Bonded Fiber Ribbon Is
Optical fibers are arranged 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. A 12-fiber design may use six two-fiber subunits. The configurations range from 4 to 36 fibers, and bond spacing ranges from 10 to 1,000 millimeters.
Intermittent Bonded Ribbon Production Line
How Rollable Ribbons Differ From Conventional Flat Ribbons
In a conventional flat ribbon, the fibers remain in one fixed plane. A rollable fiber ribbon can fold between bonds while retaining fiber alignment for mass-fusion splicing. Prysmian’s FlexRibbon uses small bonding points to permit bending and folding.
Why Flexible Ribbons Support Compact, High-Density Cables
Ribbon flexibility reduces the space it occupies inside a high-density fiber cable. This enables cable designers to fit more fibers into a compact structure while preserving an organized fiber layout.
Process And Equipment For An Intermittent Bonded Ribbon Production Line
The intermittent bonded ribbon production process places optical fibers side by side along the ribbon’s length. Subunits are formed when a first material coats groups containing two or more fibers. Neighboring subunits are joined at separate points with a second material, leaving flexible sections between bonds.
Organize Adjacent Optical Fibers Into Subunits
Fibers are positioned beside one another according to the planned ribbon layout. The first coating material encloses each selected group and holds its fibers together as a subunit.
Apply Subunit Coating And Intermittent Bonding Material
The subunits are created by fiber ribbon coating. 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
Wet-on-wet bonding involves applying the bonding material before the subunit coating has cured. The materials diffuse across their shared interface to form a diffusion zone.
Cure The Subunit Coating And Bonds Together
A single curing step sets both the subunit coating and the intermittent bonds. Optical fiber ribbon equipment supports these operations, although a complete equipment list, line speed, and production capacity are not specified.
| Production Stage | Material Or Action | Intended Purpose |
|---|---|---|
| Optical fiber arrangement | Place fibers side by side | Set the ribbon layout |
| Formation of subunits | Coat fiber groups with the first coating material | Keep groups of two or more fibers together as subunits |
| Bonding at intervals | Apply the second material between adjacent subunits | Join subunits at spaced points |
| Wet-on-wet interface | Apply bonds before the subunit coating cures | Enable formation of a diffusion zone between the materials |
| Joint curing step | Cure coating and bonds in one step | Cure the assembled ribbon structure |
Main Production Line Stages And Process Controls
The fiber ribbon production stages follow a defined order. The sequence involves arranging fibers into subunits, applying a subunit coating, placing intermittent bonds between adjacent subunits, and curing the coating and bonds together. The ribbon design must guide both optical fiber coating application and positioning of the bonds.
Example designs specify gaps of 5 to 100 micrometers between subunits. A range of 10 to 1,000 millimeters is described for intermittent bond spacing in example designs. Bond deposits may have a diamond-like outline with narrow ends and a broader 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. Because the source material provides no line speeds, curing temperatures, or inspection intervals, avoid assuming any values for them.
Materials, Bond Design, And Ribbon Flexibility
Material selection and bond layout determine how the ribbon behaves during cable making and splicing. Each fiber is covered by coatings that still allow the subunits to flex as designed.
Select Compatible Coating And Bonding Materials
Subunit coatings and ribbon bonding materials have distinct functions, so their formulas need not be identical. A gradual interface can be formed by resins that intermix or remain at least partly soluble. Lower coating viscosity may also promote intermixing.
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. The disclosed thickness range is 2 to 50 micrometers, while 5 to 15 micrometers is identified as a narrower range.
Control Bond Placement, Spacing, And Geometry
Bond spacing controls where fiber subunits stay connected and where they can move freely. An intermittent bond layout creates unconnected spans separating the 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 change from a flat layout into a rolled, curled, or folded shape. A flexible fiber ribbon design bends during cable installation while keeping fibers organized for splicing.
Quality Checks For 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.
Check Bond Continuity And Subunit Alignment
Check that intermittent bonds join adjacent subunits at planned locations and leave unbonded lengths between connections. Review subunit alignment and gaps because movement can affect ribbon shape and bond geometry.
Evaluate Ribbon Flexibility And Rollability
Assess ribbon rollability by examining how the ribbon bends and gathers without changing fiber 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 check 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.
Cable Applications, Integration, And Splicing Benefits
By folding within a cable, intermittently bonded ribbons allow more fibers in a compact design. Prysmian says FlexRibbon supports high-density ribbon cable designs, smaller diameters, and better fiber duct utilization.
Enable High-Density Cable Designs And Better Duct Utilization
For indoor, outdoor, and indoor/outdoor applications, Prysmian provides FusionLink and MassLink with FlexRibbon. FusionLink uses dry water blocking and is available with 250 μm or 200 μm ribbon. EcoSpan aerial cable supports spans of up to 300 feet under NESC Heavy loading conditions. FlexDrop is a small-diameter outdoor option that accommodates up to two 12-fiber ribbons.
Enable Mass-Fusion Splicing And Faster Deployment
Multiple ribbon fibers, often 12 at a time, are joined in one operation through mass-fusion splicing. On compatible ribbon routes, this method can shorten splice time. For loose-tube cable connections, technicians separate the ribbon fibers and splice them one by one using a single-fiber splicer.
Consider Indoor, Outdoor, Access, And Broadband Uses
Applications for ribbon cable include point-to-point networks, indoor FTTH systems, MTP wiring-box links, and urban trunk routes. Selecting indoor and outdoor fiber cable for each route helps align cable construction with the needs of buildings, aerial runs, and underground installations.
Conclusion
Fiber layout, bond placement, curing, and inspection are addressed in an intermittent bonded ribbon line guide. The result is a flexible optical fiber ribbon that remains organized during handling yet can roll or fold into compact cable designs.
The process involves applying bonds while the subunit coating is still uncured. The materials create a diffusion zone before curing together. Reliable fiber cable manufacturing is supported 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 multiple cable designs, including compact configurations with up to 6,912 fibers.
Manufacturers and network planners need to balance fiber alignment, bond strength, and rollability. Achieving that balance can simplify cable packaging while keeping ribbons ready for efficient installation and splicing.