Guide To The Intermittent Bonded Ribbon Production Line
An intermittent bonded ribbon production line joins fiber subunits at set intervals. This keeps fibers in an organized arrangement for mass-fusion splicing while letting the ribbon roll or fold into a compact cable shape. The design enables flexible ribbon cable production without compromising efficient fiber handling.
In some processes, bonding material is applied while the subunit coating is still uncured. The materials can intermix 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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What Is An Intermittent Bonded Fiber Ribbon?
An intermittent bonded fiber ribbon groups optical fibers into small subunits. Although they remain organized for splicing, the subunits can change their shape to fit within a cable.
How Fiber Subunits And Intermittent Bonds Are Arranged
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 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 curl between bonds while retaining fiber alignment for mass-fusion splicing. Prysmian’s FlexRibbon uses compact bonding points to permit bending and folding.
How Flexible Ribbons Enable 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.
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. Subunits are created when a first material coats groups containing two or more fibers. A second material joins neighboring subunits at spaced points and leaves flexible sections between the bonds.
Organize 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.
Apply 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
Wet-on-wet bonding involves depositing the bonding material before the subunit coating has cured. A diffusion zone develops as the materials intermix through their shared interface.
Set The Subunit Coating And Bonds In One Cure
Both the subunit coating and the intermittent bonds are cured in one curing step. Optical fiber ribbon equipment supports these operations, although a complete equipment list, line speed, and production capacity are not specified.
| Production Stage | Material Or Operation | Purpose |
|---|---|---|
| Fiber arrangement | Place fibers side by side | Establish 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 | Deposit the second material between neighboring subunits | Connect subunits at separated bond points |
| Wet-on-wet interface | Deposit bonds while the subunit coating remains uncured | Allow materials to form a diffusion zone |
| Combined cure | Set the coating and bonds together in one step | Set the assembled ribbon structure |
Main 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.
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 materials, bond layout, and curing method. 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
Subunit coatings and ribbon bonding materials have different 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 encourage intermixing.
This interface creates a diffusion zone in which properties change 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.
Manage Bond Placement, Spacing, And Geometry
Bond spacing determines where fiber subunits stay connected and where they can move freely. Intermittent bond geometry leaves unbonded spans between bond points. Intersecting convex and concave curves form the saddle shape used on some bond surfaces.
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 flexes during cable installation while keeping fibers organized for splicing.
Quality Checks To Maintain Consistent Ribbon Production
Reliable fiber ribbon quality checks measure defined features rather than relying on assumed pass limits. Design factors named in the patent include the spacing of bonds, subunit gaps, diffusion-zone thickness, and bond shape. However, it does not specify inspection methods or acceptance limits.
Check Bond Continuity And Subunit Alignment
Check that intermittent bonds connect adjacent subunits at planned locations and leave unbonded lengths between connections. Subunit alignment and gaps require checking because shifts may change ribbon shape and bond geometry.
Evaluate Ribbon Flexibility And Rollability
To evaluate ribbon rollability, observe whether it bends and gathers while keeping fibers in their original order. Throughout the ribbon design, evaluate bond spacing and flexibility. These comparisons are design checks, not universal production tolerances.
Confirm Fiber Identification And Ribbon Configuration
Confirm each fiber’s position using fiber color coding. Blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, and aqua make up a common 12-color sequence. The color sequence may start again when a ribbon has more than 12 fibers.
Applications, Cable 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.
Enable High-Density Cable Designs And Better Duct Utilization
Prysmian offers FusionLink and MassLink with FlexRibbon in indoor, outdoor, and indoor/outdoor designs. FusionLink features dry water blocking and is available with 250 μm or 200 μm ribbon. Under NESC Heavy loading conditions, EcoSpan aerial cable can accommodate spans of up to 300 feet. FlexDrop is a small-diameter outdoor option that accommodates up to two 12-fiber ribbons.
Support Mass-Fusion Splicing And Quicker Deployment
Multiple ribbon fibers, often 12 at a time, are joined in one operation through mass-fusion splicing. This approach may reduce splice time where ribbon routes are compatible. When connecting to loose-tube cable, technicians split 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 aligns 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.
The process involves depositing bonds while the subunit coating is still uncured. 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 multiple 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.