A small problem with an FRP rod can turn into a much bigger cable problem later. The rod serves as the central component of many fiber optic cables, providing structural stability and preventing buckling during manufacturing and operation. So, diameter alone cannot be the sole criterion when making your selection. Any defects in the material surface, poor dimensional control and inconsistency of mechanical properties can affect the final product.
Moisture requirements can also play an important role, especially for outdoor applications. When buying FRP Rods for Optical Fiber Cables, consider the following mistakes that you can avoid by performing a few simple actions prior to your procurement.
Mistake 1: Inspecting the Diameter Only
An FRP rod designated as 2.0 mm does not necessarily mean that it will work perfectly in your cable.
You must also consider the material’s dimensional consistency, since an inconsistent diameter will likely affect how well the rod fits with buffer tubes and fillers.
Corning’s optical cable specifications demonstrate that the dimensional sizing of the GRP central member plays a crucial part in accommodating the surrounding buffer tubes and fillers.
Mistake 2: Not Performing Visual Inspection of FRP Rods
Performing a visual inspection might seem elementary, but it can still help identify possible defects before the material reaches your production facility.
While inspecting FRP Rods for Optical Fiber Cables for possible defects, you should check for:
- cracks, splits or exposed glass fibres
- rough or uneven surface
- poor straightness or any bends
- inconsistent diameter and ovality
- dirt or other contaminations
- coating defects, if present
- damaged reels or uneven winding
Mistake 3: Not Considering Moisture and Water-Blocking Specifications
Not all optical cables experience the same level of moisture. Different requirements apply for indoor, outdoor, underground or duct cables.
If the cable protection gets damaged, the water can migrate through the cable core. Thus, manufacturers should make a decision on how the entire cable structure will block the migration of water.
When stronger moisture protection is needed, water-swellable FRP rods can provide additional water-blocking protection. Water swellable tapes and yarns are also widely used for dry cable constructions. Corning mentions that controlling the water migration reduces the risks of water getting inside the optical cables.
Mistake 4: Considering Only the Tensile Strength of FRP Rod
High tensile strength looks like a great feature on the specification sheet. Nevertheless, this property cannot inform you about all the material characteristics.
Prior to selecting the FRP rods, you should consider the following characteristics of the material:
- tensile strength and modulus
- diameter and tolerance
- straightness
- surface finish
- shrinkage behaviour
- coating quality, if present
- water swellable properties, if required
Moreover, you should establish acceptable acceptance criteria for incoming material. Then your quality team will be able to perform all inspections according to these criteria instead of relying on visual inspections or supplier information.
Mistake 5: Selecting the Cheapest Supplier
Price can play an important role when selecting the FRP rods. However, inconsistent raw material can cost you even more because of the rejected cables, machine downtime and customer complaints.
A reliable supplier must provide the detailed material specifications and maintain constant manufacturing controls. Ask the supplier about the raw material inspection, dimensional inspection, batch testing, packaging and traceability.
Moreover, the supplier of FRP Rods for Optical Fiber Cables must be familiar with your cable application. The proper material specification depends on the final product’s manufacturing and application.
FAQs:
1. What defects should manufacturers inspect in an FRP rod?
Check for cracks, exposed fibres, uneven surface, poor straightness, diameter variations and coating defects. Inspect the reel condition and batch consistency before using the rods in production.
2. Why is dimensional tolerance important in FRP rods?
Dimensional consistency helps the rod fit properly with other cable components. Poor tolerance might affect the geometry of the cable and cause problems in manufacturing.
3. How should manufacturers select an FRP rod supplier?
Check the technical specifications, quality controls, testing procedures, production consistency and capability to meet your requirements. Price should be one factor, but not the only one.