UNDERSTANDING MASS-FUSION SPLICING FOR OPTICAL FIBER RIBBONS
Guide To The Intermittent Bonded Ribbon Production Line
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 effective fiber handling.
In some processes, bonding material is added 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. These methods illustrate how optical fiber ribbon manufacturing and fiber optic bonding operate together.
Intermittent Bonded Ribbon Fiber Secondary Coating Line Fiber Ribbone Line
What Is An Intermittent Bonded Fiber Ribbon?
An intermittent bonded fiber ribbon groups optical fibers into small subunits. The subunits stay organized for splicing while remaining able to change shape to fit inside a cable.
The Arrangement Of Fiber Subunits And Intermittent Bonds
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. The configurations range from 4 to 36 fibers, and bond spacing ranges from 10 to 1,000 millimeters.
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. Between bonds, a rollable fiber ribbon can curl without losing the fiber alignment needed for mass-fusion splicing. Bending and folding are supported by the discrete bonding points used in Prysmian’s FlexRibbon.
How Flexible Ribbons Enable 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.
Intermittent Bonded Ribbon Production Line: Process And Equipment
The intermittent bonded ribbon production process aligns optical fibers 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
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. 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
During wet-on-wet bonding, the subunit coating remains unset when bonding material is applied. A diffusion zone develops as the materials intermix through their shared interface.
Cure The Subunit Coating And Bonds Together
Both the subunit coating and the intermittent bonds are cured in one curing step. Optical fiber ribbon equipment performs 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 | 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 interface | Deposit bonds while the subunit coating remains uncured | Enable formation of a diffusion zone between the materials |
| Joint curing step | Set the coating and bonds together in one step | Set the assembled ribbon structure |
Key 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 match the ribbon design.
Gaps of 5 to 100 micrometers between subunits are described in example designs. Example intermittent bond spacing ranges from 10 to 1,000 millimeters. Bond deposits may have a diamond-like outline with narrow ends and a wider center. The disclosed examples should not be interpreted as fixed settings that apply to every 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, do not presume any values for them.
Materials, Bond Design, And Ribbon Flexibility
Ribbon behavior during cable making and splicing depends on the chosen materials and bond layout. Each fiber is protected by coatings that still allow the subunits to flex as designed.
Choose Compatible Coating And Bonding Materials
Because subunit coatings and ribbon bonding materials serve different roles, they do not have to share the same formula. Resins that mix or remain at least partly soluble can form a gradual interface. Lower coating viscosity may also promote intermixing.
This interface forms a diffusion zone in which properties change gradually. The zone may differ in color, stiffness, surface friction, tear strength, or stretch. The disclosed thickness range is 2 to 50 micrometers, while 5 to 15 micrometers is given as a narrower range.
Manage 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. 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 shift from a flat layout into a rolled, curled, or folded shape. During cable installation, a flexible fiber ribbon can flex without disrupting the fiber organization needed for splicing.
Quality Checks For 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.
Check Bond Continuity And Subunit Alignment
Check that intermittent bonds join 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, observe whether it bends and gathers while keeping fibers in their original 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
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 repeat when a ribbon has more than 12 fibers.
Applications, Cable Integration, And Splicing Benefits
Intermittently bonded ribbons can roll 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
For indoor, outdoor, and indoor/outdoor applications, Prysmian provides FusionLink and MassLink with FlexRibbon. 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.
Enable Mass-Fusion Splicing And Faster Deployment
Mass-fusion splicing connects several ribbon fibers in a single operation, often 12 at once. On compatible ribbon routes, this method can reduce splice time. When connecting to loose-tube cable, technicians separate ribbon fibers and individually splice them with 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. Selecting indoor and outdoor fiber cable for each route helps match cable construction with the needs of buildings, aerial runs, and underground installations.
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.
The process involves applying bonds while the subunit coating is still uncured. Before they cure together, the materials develop a diffusion zone. Reliable fiber cable manufacturing is encouraged by careful control at every stage.
Mass-fusion ribbon splicing is also supported by flexible ribbons, helping crews splice many fibers in one operation. 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.
