Intermittent Bonded Ribbon Production Line Guide
At defined intervals, an intermittent bonded ribbon production line joins fiber subunits. 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. Diffusion can occur through the shared interface before the materials 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.
Fiber Draw Tower Compact Fiber Unit Fiber Coloring Machine
What Is An Intermittent Bonded Fiber Ribbon?
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
A coating holds 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. A 12-fiber design may include six two-fiber subunits. 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 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
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 form subunits. Neighboring subunits are joined at spaced 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
Fiber ribbon coating creates the subunits. A discrete coating applicator places bonding material between neighboring subunits at intervals rather than along their entire length.
Create Diffusion Zones Through Wet-On-Wet Application
During wet-on-wet bonding, the subunit coating remains uncured when bonding material is applied. 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 | Intended Purpose |
|---|---|---|
| Optical fiber arrangement | Arrange fibers next to one another | 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 | Connect subunits at separated bond points |
| Wet-on-wet bonding interface | Deposit bonds while the subunit coating remains uncured | Allow materials to form a diffusion zone |
| Joint curing step | Cure coating and bonds in one step | Cure 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. The ribbon design must guide both optical fiber coating application and placement of the bonds.
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, narrowing at the ends and widening in the center. The disclosed examples should not be interpreted as fixed settings that apply to every line.
Ribbon manufacturing process control depends on the chosen material selection, 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.
Ribbon Flexibility, Bond Design, And Materials
Ribbon behavior during cable making and splicing depends on material choice and bond layout. Each fiber is protected by coatings that still allow the subunits to flex as designed.
Select 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 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 leaves unbonded spans between bond points. Intersecting convex and concave curves create the saddle shape used on some bond surfaces.
Balance Ribbon Flexibility With Fiber Organization
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. The patent identifies design factors such as bond spacing, subunit gaps, diffusion-zone thickness, and bond shape. The patent does not, however, provide 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
Assess ribbon rollability by examining 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 universal production tolerances.
Verify 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
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.
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 spliced in one operation through mass-fusion splicing. This approach may shorten 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
Applications for ribbon cable include point-to-point network links, 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 covers fiber layout, bond placement, curing, and inspection. The result is a flexible optical fiber ribbon that remains orderly during handling yet can roll or fold into compact cable designs.
In this process, bonds are placed before the subunit coating cures. The materials create a diffusion zone before curing together. Careful control throughout the process supports reliable fiber cable manufacturing.
Flexible ribbons also support mass-fusion ribbon splicing, allowing crews to join multiple fibers at once. Prysmian describes FlexRibbon in various cable designs, including compact configurations containing up to 6,912 fibers.
For manufacturers and network planners, the priority is to coordinate fiber alignment, bond strength, and rollability. This balance may make cable packaging easier while ensuring ribbons remain prepared for efficient installation and splicing.