Intermittent Bonded Ribbon Production Line Guide
An intermittent bonded ribbon production line joins fiber subunits at set intervals. Fibers remain organized for mass-fusion splicing, while the ribbon can fold into a compact cable shape. Flexible ribbon cable production is supported by this design while preserving efficient fiber handling.
In some processes, bonding material is added while the subunit coating is still uncured. 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. These methods illustrate how optical fiber ribbon manufacturing and fiber optic bonding work in combination.
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Understanding What An Intermittent Bonded Fiber Ribbon Is
An intermittent bonded fiber ribbon organizes optical fibers into small subunits. The subunits stay organized for splicing while remaining able to change shape to sit inside a cable.
How Fiber Subunits And Intermittent Bonds Are Arranged
A coating secures each adjacent fiber pair or group together. Instead of joining along their entire length, these optical fiber subunits are linked to neighboring subunits at spaced bond points. Six two-fiber subunits may form a 12-fiber design. Configurations can contain 4 to 36 fibers, with bonds spaced from 10 to 1,000 millimeters apart.
Intermittent Bonded Ribbon Production Line
How Rollable Ribbons Differ From Conventional Flat Ribbons
In a conventional flat ribbon, the fibers remain in a single fixed plane. A rollable fiber ribbon can fold between bonds while retaining fiber alignment for mass-fusion splicing. Prysmian’s FlexRibbon uses compact bonding points to permit bending and folding.
Why Flexible Ribbons Support Compact, High-Density Cables
Inside a high-density fiber cable, a flexible ribbon can occupy less space. 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
Throughout an intermittent bonded ribbon production process, optical fibers are arranged side by side along the ribbon’s length. A first material coats groups of two or more fibers to create subunits. Neighboring subunits are joined at separate points with a second material, leaving flexible sections between bonds.
Arrange Adjacent Optical Fibers Into Subunits
The planned ribbon layout determines how fibers are arranged next to one another. The first coating material surrounds each selected group and holds its fibers together as a subunit.
Deposit Subunit Coating And Intermittent Bonding Material
The subunits are formed by fiber ribbon coating. A discrete coating applicator places bonding material between neighboring subunits at intervals rather than along their entire length.
Use Wet-On-Wet Application To Form Diffusion Zones
Wet-on-wet bonding involves depositing the bonding material before the subunit coating has cured. A diffusion zone develops as the materials diffuse through their shared interface.
Set The Subunit Coating And Bonds In One Cure
Both the subunit coating and the intermittent bonds are set in one curing step. 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 | Intended Purpose |
|---|---|---|
| Optical fiber arrangement | Place fibers side by side | Set the ribbon layout |
| Formation of subunits | Apply the first coating material around fiber groups | 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 | Set 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 placement 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. Some bond deposits take a diamond-like shape, tapering at the ends and widening in the center. These are disclosed examples, not fixed parameters for every production line.
Ribbon manufacturing process control depends on the chosen material selection, bond layout, and curing method. Because the source material provides no line speeds, curing temperatures, or inspection intervals, avoid assuming any values for them.
Ribbon Flexibility, Bond Design, And Materials
Ribbon behavior during cable making and splicing depends on material choice and bond layout. Coatings shield each fiber while permitting the subunits to flex as intended.
Select 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 vary gradually. The zone may differ in color, stiffness, surface friction, tear strength, or stretch. Disclosed thicknesses range from 2 to 50 micrometers, with 5 to 15 micrometers representing a narrower range.
Control 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
Between bonds, unbonded spans let a flat ribbon transform into a rolled, curled, or folded form. A flexible fiber ribbon design flexes during cable installation while keeping fibers organized for splicing.
Quality Checks To Maintain Consistent Ribbon Production
Instead of using assumed pass limits, dependable fiber ribbon quality checks assess defined features. The patent identifies design factors such as bond spacing, subunit gaps, diffusion-zone thickness, and bond shape. However, it does not specify inspection methods or acceptance limits.
Check 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
Assess ribbon rollability by observing how the ribbon bends and gathers without changing fiber order. Throughout the ribbon design, compare bond spacing and flexibility. 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. Blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, and aqua make up a common 12-color sequence. For ribbons containing more than 12 fibers, this sequence may repeat.
Cable Applications, Integration, And Splicing Benefits
Intermittently bonded ribbons can fold inside a cable, enabling more fibers to fit into a compact design. According to Prysmian, FlexRibbon enables high-density ribbon cable designs with smaller diameters and better fiber duct utilization.
Support High-Density Cable Designs And Duct Utilization
Prysmian offers FusionLink and MassLink with FlexRibbon in indoor, outdoor, and indoor/outdoor designs. 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 hold 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. When connecting to loose-tube cable, technicians separate ribbon fibers and individually splice them with 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
Fiber layout, bond placement, curing, and inspection are addressed in an intermittent bonded ribbon line guide. 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 placed before the subunit coating cures. The materials form a diffusion zone before curing together. Careful control throughout the process helps maintain reliable fiber cable manufacturing.
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.
For manufacturers and network planners, the priority is to coordinate fiber alignment, bond strength, and rollability. Achieving that balance can simplify cable packaging while keeping ribbons ready for efficient installation and splicing.