FTTH Cable Production Line – New Light On A Important Point..

The stranding technology supports the stranding of jelly-loaded in addition to Cable Air Wiper designs. Stranding can be done possibly as a stand-alone process or tandemized with the jacketing process. Sophisticated new technical solutions like torsion shaft lay-dish SZ stranding machines, dual go across binders having an sufficient line control system permit a controlled stranding process. Every single stranding disc is individually driven via a timing belt without having intermediate gear.

The stranding process guarantees in most conditions reduced stranding tension fluctuation, precise and stable lay length and continuous binding tension.

SZ Stranding is the process of twisting Pipes or Wires in to a cable framework under managed problems. The tubes/cables are carefully guided via several rotating discs. The disks will spin until approximately 14 turns in one direction is achieved. The discs then reverse and perspective the pipe/cables approximately 14 transforms in the opposite path. For this reason SZ stranding motion, the pay-off reels or even the consider-up do not have to spin to be able to manufacture a cable and also this brings about high line speeds. The pipes /wires are locked in location after SZ stranding by way of a polyester or a similar binder material.

The Tensor ‘EXCEL STRAND’ SZ Stranding line has been developed right after several years of experience providing stranding lines throughout the world. We remain on the leading edge of technology making use of the latest electronic devices, drives and engine combinations to accomplish repeatable and dependable performance. The SZ Stranding line may be configured in a number of different ways dependant upon the customer needs. Some stranding outlines have 6 pay-offs whilst other outlines have 24 or even more pay-offs. Other peripheral gear could be put into the SZ Stranding line like water obstructing gel or adhesive tape, aramid yarn web servers and perhaps even an extruder. Every line is custom made dependant upon the consumer requirements and creativity.

A system and method for identifying the set duration of S-Z stranded buffer pipes throughout the production procedure of a fiber optic cable without having reducing the manufacturing procedure. Images of your S-Z stuck barrier tube are captured with a digital camera. The photos are delivered from the camera to some personal computer work station. Your computer work station shows the photos taken using the camera and executes programming components that determine the lay entire S-Z stuck barrier tube during the production procedure of the cable. Enter gadgets such as a mouse along with a key pad can be utilized in conjunction with the operations of the personal computer workstation. By measuring the lay duration during cable manufacture, productivity might be maintained while making certain the stranding of Yarn Bind fails to fall out of tolerance, that might result in deleterious bending anxiety of optical fibers within the barrier pipes.

The present creation relates to optical fiber wires which have buffer tubes arranged in S-Z strands, as well as in particular a way of determining the set period of such S-Z strands during the production procedure.In telecom wires, optical fibers or visual fiber ribbons tend to be used being a medium to deliver visual signals. These wires often have a central strength member, for instance a metal rod or stuck steel wires, that expands longitudinally across the central axis in the cable. As shown in FIG. 1 (from U.S. Patent No. 5,229,851, which can be incorporated by reference), main power member 2 is designed to withstand and resist any tensile or compressive force applied axially towards the cable 1. The main power member 2 is usually encircled by way of a covering 3, which might serve as a padding materials. A plurality of plastic material barrier pipes 4-8 surround covering 3 and loosely house safeguard visual fibers or ribbons within them.

A binder thread or threads 17 and 18 are often contra helically used around buffer pipes 4-8 to hold them in place. A water swellable adhesive tape (not demonstrated) might be applied on the barrier pipes to block water ingress to the cable. A general plastic jacket 20 then covers the items in visual fiber cable 1. In the event the designed installation for cable 1 demands extra mechanised power, the cable might include extra strength associates as armor or strength yarns 19 placed intermediate the water swellable tape and the coat.As shown in FIG. 1, barrier tubes 4-8 are typically wrapped around central power fellow member 2 within a reverse helix or “S-Z” style. The locations where the stuck pipes reverse direction (e.g. from an “S” to some “Z”) are referred to as reversal points. S-Z stranding of buffer tubes in general, and the reversal factors in particular, are advantageous for obtaining the cable midspan. That is, due to the S-Z stranding, one or more visual fibers inside the cable could be “tapped” on the reversal factors without having to sever the cable or to handle major reconfiguration. The S-Z stranding offers sufficient excess of pipe duration to help make the tap easy by opening along side it from the cable at a point together its length without losing the desired slack inside the ribbon units or optical fibers in the tube that is certainly opened.

Thus, faucets in an S-Z stranded cable can be produced without having interrupting other pipes or ribbon models.To ensure that the optical fibers in the buffer pipes are certainly not put through bending anxiety, which can result in undesirable attenuation, a parameter of the S-Z stranded buffer pipes known as “lay duration” has to be monitored. Bending stress is a reduction mechanism in visual fibers that could happen in the event the cable is subjected to tensile causes, possibly from installation or heat, or compression forces. Bending stress may cause transmission loss inside the visual fibers. The S-Z strand of buffer pipes within an visual fiber cable might take several forms. Every ‘S’ turn may be followed immediately with a reversal to a ‘Z’ stranding path. Alternatively, there might be a number of helical transforms among reversals. Generally, then, the normal set duration is defined by the distance among reversal points divided by the amount of transforms among reversals.The actual lay duration of every individual S-Z stuck pipe can vary from the typical set length by a small amount due to additional twisting and handling problems. That is, the set length of virtually any tube, could be more or less compared to the typical lay duration, as a given pipe may make greater than a whole variety of turns among reversals. For example, in a cable with 6 different colored barrier tubes, one being red-colored, and all of S-Z stuck about a main fellow member, the red-colored pipe may be towards the top or on the 12o’clock position around the cable at the first reversal point.

But at the following reversal stage the red-colored tube may be on the 6 o’clock place around the cable, 3 tubes removed from the 12 o’clock place. Therefore, the red pipe went one half transform more among reversals. This half-turn must be contained in the lay length computation for the best accuracy. Thus, the actual set length of a particular S-Z stranded SZ Stranding Line is comprised of a number of components and can be calculated to seal approximation by:Lay Duration = D/N,where:N = N’ n/T in which D will be the axial distance involving the reversal factors, N is the amount of turns between reversals, and N’ is the quantity of entire turns in between the reversal factors; n is the amount of pipes which a provided pipe is counteract looking at the angular position on the previous reversal point, counted in the direction of rotation; and T is definitely the complete quantity of buffer tubes.To guard against bending anxiety in the visual fibers, the set entire S-Z stranded barrier tubes is checked on finished cable to ensure that the lay length is inside appropriate specifications. The only way to look at the set length on finished wires is always to strip back the jacket and other layers in the cable on the barrier pipes. It is not sufficient to achieve this in the cable finishes because the start-up and finish from the stranding process may have been completed at issues that change from all of those other cable. Rather, set duration has zzgjup measured manually during the manufacturing procedure after stranding. The line owner would make the duration way of measuring while walking together with the advancing cable, which was reasonably easy to complete accurately simply because line rates of speed were slow. Recently, however, line speeds have increased dramatically, making this type of manual measurement incorrect. One alternative is to quit the line periodically to consider measurements.

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