Guide To The Intermittent Bonded Ribbon Production Line

At set intervals, an intermittent bonded ribbon production line joins fiber subunits. 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.

Some processes apply bonding material before the subunit coating cures. The materials can diffuse across their interface and 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

An intermittent bonded fiber ribbon groups optical fibers into small subunits. Although they remain organized for splicing, the subunits can adjust their shape to fit within a cable.

The Arrangement Of Fiber Subunits And Intermittent Bonds

Each adjacent pair or group of fibers is held together by a coating. Instead of joining along their entire length, these optical fiber subunits are connected to neighboring subunits at spaced bond points. 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

A conventional flat ribbon holds its fibers in a single fixed plane. Between bonds, a rollable fiber ribbon can fold 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

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 maintaining 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. A second material links neighboring subunits at spaced points and leaves flexible sections between the bonds.

Arrange Adjacent Optical Fibers Into Subunits

Fibers are placed beside one another according to the planned ribbon layout. Each selected group becomes a subunit when the first coating material surrounds and holds its fibers together.

Deposit 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

Wet-on-wet bonding involves applying the bonding material before the subunit coating has cured. A diffusion zone develops as the materials diffuse through their shared interface.

Set The Subunit Coating And Bonds In One Cure

Both the subunit coating and the intermittent bonds are set in one curing step. Although optical fiber ribbon equipment is used for these operations, the complete equipment list, line speed, and production capacity are not provided.

Production 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
Bonding at intervals	Apply the second material between adjacent subunits	Connect subunits at separated bond points
Wet-on-wet interface	Apply bonds before the subunit coating cures	Allow materials to form a diffusion zone
Combined cure	Cure coating and bonds in one step	Set the assembled ribbon structure

Key Production Line Stages And Process Controls

Fiber ribbon production stages take place in a specific sequence. The sequence involves arranging fibers into subunits, applying a subunit coating, placing intermittent bonds between adjacent subunits, and curing the coating and bonds together. Optical fiber coating application and bond placement must match the ribbon design.

Gaps of 5 to 100 micrometers between subunits are given 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.

The selected materials, bond layout, and curing method influence ribbon manufacturing process control. 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

Material selection and bond layout determine how the ribbon behaves during cable making and splicing. Coatings protect each fiber while permitting the subunits to flex as intended.

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 produce a gradual interface. Intermixing may also be encouraged by lower coating viscosity.

This interface creates 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. Intermittent bond geometry provides unbonded spans between bond points. Some bond surfaces have a saddle shape made by intersecting convex and concave curves.

Maintain Fiber Organization While Balancing Ribbon Flexibility

Unbonded spans allow the ribbon to shift 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 For 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. However, it does not specify inspection methods or acceptance limits.

Check 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 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, compare bond spacing and flexibility. These comparisons are checks of the design, not universal production tolerances.

Confirm Fiber Identification And Ribbon Configuration

Confirm each fiber’s position using fiber color coding. A common 12-color sequence is blue, orange, green, brown, slate, white, red, black, yellow, violet, rose, and aqua. For ribbons containing more than 12 fibers, this sequence may repeat.

Applications, Cable Integration, And Splicing Benefits

By folding within a cable, intermittently bonded ribbons allow more fibers in a compact design. According to Prysmian, FlexRibbon enables high-density ribbon cable designs with smaller diameters and better fiber duct utilization.

Support High-Density Cable Designs And Duct Utilization

For indoor, outdoor, and indoor/outdoor applications, Prysmian offers FusionLink and MassLink with FlexRibbon. FusionLink features dry water blocking and is available with 250 μm or 200 μm ribbon. EcoSpan aerial cable supports spans of up to 300 feet under NESC Heavy loading conditions. As a small-diameter outdoor option, FlexDrop can hold up to two 12-fiber ribbons.

Support Mass-Fusion Splicing And Quicker Deployment

Mass-fusion splicing joins several ribbon fibers in a single operation, often 12 at once. On compatible ribbon routes, this method can reduce splice time. 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

Ribbon cable is used in point-to-point networks, 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.

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. The materials form 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. Prysmian describes FlexRibbon in various cable designs, including compact configurations containing up to 6,912 fibers.

Manufacturers and network planners need to manage fiber alignment, bond strength, and rollability. This balance may make cable packaging simpler while ensuring ribbons remain prepared for efficient installation and splicing.