The stranding technology supports the stranding of jelly-filled in addition to TCC Laser Printer For Cable styles. Stranding can be done possibly as a stand-alone process or tandemized with the jacketing procedure. Sophisticated new technical solutions like torsion shaft set-plate SZ stranding machines, double go across binders with an adequate line control system enable a controlled stranding procedure. Each single stranding disc is individually powered by way of a timing belt without intermediate equipment.

The stranding process ensures in all circumstances low stranding stress fluctuation, accurate and stable set length and constant binding stress.

SZ Stranding is the method of twisting Tubes or Cables in to a cable structure below controlled conditions. The pipes/wires are carefully guided via a series of rotating discs. The disks will spin until as much as 14 transforms in one path is achieved. The discs then change and perspective the pipe/cables up to 14 transforms in the opposing direction. Because of this SZ stranding motion, the pay out-off reels or even the take-up do not have to rotate so that you can produce a cable and also this results in higher line rates of speed. The tubes /cables are kept in location after SZ stranding by a polyester or a comparable binder material.

The Tensor ‘EXCEL STRAND’ SZ Stranding line has been created right after many years of experience providing stranding lines all over the world. We stay on the leading edge of technology utilizing the latest electronic devices, pushes and motor combinations to attain repeatable and reliable overall performance. The SZ Stranding line could be configured in numerous different ways dependant upon the customer requirements. Some stranding outlines have 6 pay out-offs while other lines have 24 or even more pay out-offs. Other peripheral gear may be put into the SZ Stranding line like water obstructing gel or adhesive tape, aramid yarn web servers and in many cases even an extruder. Each line is custom built dependant upon the customer requirements and imagination.

A system and technique for identifying the set length of S-Z stranded buffer pipes throughout the production process of a fiber optic cable without slowing the production procedure. Pictures of the S-Z stranded barrier tube are grabbed with a camera. The photos are delivered through the camera to your personal computer workstation. The pc workstation shows the pictures taken with all the digital camera and executes programming components that calculate the set entire S-Z stranded barrier tube through the manufacturing procedure of the cable. Input devices for instance a mouse and a key pad may be used along with the procedures of the personal computer work station. By measuring the set duration throughout cable manufacture, efficiency could be taken care of while ensuring that the stranding of FTTH Cable Production Line does not drop out of tolerance, that might lead to deleterious twisting anxiety of visual fibers inside the barrier tubes.

The present invention relates to optical fiber cables that have buffer tubes organized in S-Z strands, as well as in particular a technique of determining the lay duration of such S-Z strands through the production process.In telecommunication wires, optical fibers or optical fiber ribbons are often utilized as being a method to send out optical impulses. These wires usually have a main strength fellow member, for instance a steel rod or stuck metal wires, that extends longitudinally across the main axis in the cable. As demonstrated in FIG. 1 (from U.S. Patent No. 5,229,851, that is incorporated by guide), main power fellow member 2 is meant to withstand and resist any tensile or compressive pressure applied axially for the cable 1. The main strength fellow member 2 is usually encircled by way of a covering 3, which may serve as a cushioning material. A plurality of plastic material barrier tubes 4-8 encompass covering 3 and freely home protect optical fibers or ribbons within them.

A binder line or threads 17 and 18 are frequently contra helically applied around barrier pipes 4-8 to keep them in position. A water swellable adhesive tape (not shown) might be applied on the buffer pipes to block water ingress to the cable. An overall plastic material coat 20 then covers the contents of visual fiber cable 1. When the intended installation for cable 1 requires extra mechanised strength, the cable may include extra power members in the form of armor or power yarns 19 positioned intermediate the water swellable tape and the jacket.As demonstrated in FIG. 1, barrier pipes 4-8 are usually covered about main power member 2 inside a change helix or “S-Z” fashion. The places at which the stranded pipes reverse direction (e.g. from an “S” to some “Z”) are known as reversal points. S-Z stranding of barrier tubes generally, and also the reversal points specifically, are advantageous for obtaining the cable midspan. That is, as a result of S-Z stranding, one or even more visual fibers inside the cable may be “tapped” on the reversal points while not having to sever the cable or to undertake significant reconfiguration. The S-Z stranding provides adequate excess of tube length to make the faucet easy by opening one side in the cable in a point along its duration without having dropping the preferred slack in the ribbon units or optical fibers within the tube that is certainly opened up.

Thus, taps in an S-Z stuck cable can be created without having interrupting other pipes or ribbon models.To ensure that the visual fibers in the buffer tubes are certainly not put through bending anxiety, which can result in undesirable attenuation, a parameter from the S-Z stranded buffer pipes known as “set duration” has to be monitored. Bending anxiety is a reduction system in visual fibers which could occur in the event the cable is put through tensile causes, either from installation or heat, or compression causes. Bending anxiety could cause transmission loss in the visual fibers. The S-Z strand of barrier pipes in an optical fiber cable may take a number of types. Every ‘S’ transform might be followed immediately by a reversal to your ‘Z’ stranding path. Additionally, there could be a number of helical transforms between reversals. Generally speaking, then, the average set duration is defined by the space between reversal points split by the amount of turns among reversals.The actual lay period of every individual S-Z stranded pipe will vary through the average lay duration with a small amount because of additional twisting and handling problems. That is, the set duration of any pipe, may be essentially than the typical lay length, as being a given pipe may make more than a entire quantity of turns among reversals. For instance, in a cable with 6 various coloured buffer tubes, one becoming red-colored, and all sorts of S-Z stranded around a central member, the red pipe could be at the top or at the 12o’clock place in the cable at the first reversal stage.

But in the following reversal stage the red-colored pipe might be on the 6 o’clock position in the cable, 3 tubes taken from the 12 o’clock place. Thus, the red tube has gone one half transform more between reversals. This half-turn has to be included in the set length calculation for the best accuracy. Thus, the actual set period of a particular S-Z stranded Fiber Coloring Machine includes several components and may be calculated to close approximation by:Lay Duration = D/N,in which:N = N’ n/T in which D is definitely the axial range in between the reversal points, N is the number of turns among reversals, and N’ is the amount of entire transforms between the reversal factors; n is the quantity of pipes which a provided pipe is offset looking at the angular place on the previous reversal point, measured toward rotation; and T is the total number of buffer pipes.To guard towards bending anxiety in the visual fibers, the set length of the S-Z stranded barrier tubes is checked on completed cable to ensure that this lay duration is inside acceptable specs. The only method to look into the set length on finished wires is always to strip back the coat along with other levels within the cable on the buffer tubes. It is really not adequate to do this in the cable finishes as the start-up and finish in the stranding process may have been done at problems that change from the rest of the cable. Instead, lay duration has zzgjup measured personally through the production process after stranding. The line operator will make the duration way of measuring whilst walking alongside the progressing cable, which had been reasonably easy to accomplish precisely simply because line speeds had been sluggish. More recently, nevertheless, line rates of speed have increased significantly, making this kind of handbook way of measuring inaccurate. One option is always to stop the line periodically to adopt measurements.

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