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 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 applied while the subunit coating is still uncured. Diffusion can occur across the shared interface before the materials 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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What Is An Intermittent Bonded Fiber Ribbon?
Optical fibers are arranged into small subunits in an intermittent bonded fiber ribbon. Although they remain organized for splicing, the subunits can adjust their shape to fit within a cable.
How Fiber Subunits And Intermittent Bonds Are Arranged
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 use 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
Differences Between Rollable Ribbons And Conventional Flat Ribbons
A conventional flat ribbon keeps its fibers in a single fixed plane. Between bonds, a rollable fiber ribbon can curl without losing the fiber alignment needed for mass-fusion splicing. Prysmian’s FlexRibbon uses small 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. Cable designers can therefore fit more fibers in a compact structure without sacrificing an organized fiber layout.
Intermittent Bonded Ribbon Production Line: Process And Equipment
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 separate points with a second material, leaving flexible sections between bonds.
Arrange 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.
Deposit Subunit Coating And Intermittent Bonding Material
The subunits are formed by fiber ribbon coating. A discrete coating applicator deposits bonding material between neighboring subunits at intervals rather than along their entire length.
Use Wet-On-Wet Application To Form Diffusion Zones
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
A single curing step sets both the subunit coating and the intermittent bonds. Optical fiber ribbon equipment performs these operations, although a complete equipment list, line speed, and production capacity are not specified.
| Process Stage | Material Or Operation | Purpose |
|---|---|---|
| Optical fiber arrangement | Place fibers side by side | Establish the ribbon layout |
| Subunit formation | 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 interface | Deposit bonds while the subunit coating remains uncured | Allow materials to form a diffusion zone |
| Combined cure | Cure coating and bonds in one step | Cure the assembled ribbon structure |
Main Production Line Stages And Process Controls
The fiber ribbon production stages proceed in a defined order. 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. Example intermittent bond spacing ranges from 10 to 1,000 millimeters. 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. 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
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 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. Differences in color, stiffness, surface friction, tear strength, or stretch may occur within this zone. Disclosed thicknesses range from 2 to 50 micrometers, with 5 to 15 micrometers representing a narrower range.
Control Bond Placement, Spacing, And Geometry
Where subunits remain joined or move freely is governed by bond spacing. Intermittent bond geometry provides 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 bends during cable installation while keeping fibers organized 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, provide inspection methods or acceptance limits.
Inspect 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 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. Throughout the ribbon design, evaluate bond spacing and flexibility. These comparisons are checks of the design, not universal production tolerances.
Verify Fiber Identification And Ribbon Configuration
Confirm each fiber’s position through fiber color coding. A common 12-color sequence is blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, and aqua. 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 more effective 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. FusionLink uses dry water blocking and is available with 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
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.
Conclusion
An intermittent bonded ribbon line guide covers 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. Before they cure together, the materials develop a diffusion zone. Careful control throughout the process helps maintain reliable fiber cable manufacturing.
Mass-fusion ribbon splicing is also enabled by flexible ribbons, helping crews splice many fibers in one operation. 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. Achieving that balance can simplify cable packaging while keeping ribbons ready for efficient installation and splicing.