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. 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. 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 grouped into small subunits in an intermittent bonded fiber ribbon. 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
A coating holds each adjacent fiber pair or group together. These optical fiber subunits connect to neighboring subunits at spaced bond points rather than along their full length. Six two-fiber subunits may make up 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
Differences Between Rollable Ribbons And Conventional Flat Ribbons
In a conventional flat ribbon, the fibers remain in one 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.
Why Flexible Ribbons Support Compact, High-Density Cables
Ribbon flexibility limits the space it occupies inside a high-density fiber cable. Cable designers can therefore accommodate more fibers in a compact structure without sacrificing 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. A first material coats groups of two or more fibers to create subunits. A second material links 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 positioned 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 created by fiber ribbon coating. Bonding material is deposited 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 diffuse through their shared interface.
Cure The Subunit Coating And Bonds Together
A single curing step cures both the subunit coating and the intermittent bonds. Although optical fiber ribbon equipment is used for these operations, the complete equipment list, line speed, and production capacity remain unspecified.
| Process Stage | Material Or Action | Intended Purpose |
|---|---|---|
| Fiber arrangement | Place fibers side by side | Establish the ribbon layout |
| Formation of subunits | Coat fiber groups with the first coating material | Hold two or more fibers as subunits |
| Intermittent bonding | Deposit the second material between neighboring 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 |
Key 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. 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 specified for intermittent bond spacing in example designs. Some bond deposits take a diamond-like shape, tapering 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. Because the source material provides no line speeds, curing temperatures, or inspection intervals, do not presume any values for them.
Ribbon Flexibility, Bond Design, And Materials
Material selection and bond layout determine how the ribbon behaves during cable making and splicing. Each fiber is protected by coatings that still allow the subunits to flex as designed.
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 formed by resins that intermix or remain at least partly soluble. Lower coating viscosity may also encourage intermixing.
This interface forms a diffusion zone in which properties 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
Bond spacing controls where fiber subunits stay connected and where they can move freely. An intermittent bond layout creates unbonded spans separating the bond points. Some bond surfaces have a saddle shape made by intersecting convex and concave curves.
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 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. Design factors named in the patent include the spacing of bonds, subunit gaps, diffusion-zone thickness, and bond shape. The patent does not, however, define 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 checking because shifts may change ribbon shape and bond geometry.
Assess Ribbon Flexibility And Rollability
To evaluate ribbon rollability, watch whether it bends and gathers while keeping fibers in their original order. Compare bond spacing and flexibility across the entire ribbon design. These comparisons are design checks, not universal production tolerances.
Verify 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. 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. Dry water blocking is used in FusionLink, which comes with either 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.
Support Mass-Fusion Splicing And Quicker Deployment
Mass-fusion splicing connects several ribbon fibers in a single operation, often 12 at once. This approach may shorten 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.
Consider Indoor, Outdoor, Access, And Broadband Uses
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.
Conclusion
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 applied before the subunit coating cures. Before they cure together, the materials form a diffusion zone. Reliable fiber cable manufacturing is encouraged by careful control at every stage.
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.
