The stranding technology supports the stranding of jelly-loaded along with Cable Air Wiper designs. Stranding can be done possibly as a stand-alone process or tandemized with the jacketing procedure. Sophisticated new technical solutions like torsion shaft lay-dish SZ stranding devices, double cross binders with an adequate line control system permit a managed stranding procedure. Each solitary stranding disc is individually driven using a timing buckle without having intermediate equipment.
The stranding process guarantees in most circumstances low stranding stress fluctuation, accurate and stable set duration and constant binding tension.
SZ Stranding is the procedure of twisting Tubes or Cables into a cable structure below managed conditions. The pipes/cables are guided via a number of revolving discs. The disks will rotate until up to 14 transforms in one direction is accomplished. The discs then change and perspective the pipe/wires up to 14 turns within the opposing direction. Because of this SZ stranding motion, the pay out-off reels or even the consider-up do not possess to rotate so that you can produce a cable and also this leads to high line rates of speed. The tubes /cables are kept in place after SZ stranding with a polyester or even a comparable binder material.
The Tensor ‘EXCEL STRAND’ SZ Stranding line continues to be created right after years of experience supplying stranding lines all over the world. We remain on the cutting edge of technology making use of the newest electronics, pushes and motor combinations to accomplish repeatable and reliable overall performance. The SZ Stranding line could be set up in numerous various ways depending on the customer requirements. Some stranding outlines have 6 pay out-offs whilst other lines have 24 or more pay out-offs. Other peripheral gear may be added to the SZ Stranding line like water blocking gel or adhesive tape, aramid yarn web servers and perhaps even an extruder. Every line is custom made depending on the customer needs and creativity.
A system and method for identifying the set period of S-Z stranded buffer pipes during the production procedure of a fiber optic cable without having reducing the production procedure. Pictures of your S-Z stuck barrier pipe are grabbed with a digital camera. The images are delivered from your camera to some personal computer workstation. The pc workstation shows the pictures used using the digital camera and executes programming modules that determine the set length of the S-Z stuck buffer pipe through the production procedure for the cable. Input devices such as a mouse along with a keyboard may be used in conjunction with the procedures from the computer workstation. By calculating the set duration during cable manufacture, efficiency could be maintained whilst ensuring that the stranding of Sheathing Line will not fall out of tolerance, which might lead to deleterious twisting anxiety of optical fibers within the buffer pipes.
The present invention pertains to optical fiber wires who have barrier tubes organized in S-Z strands, and in particular a way of identifying the set length of this kind of S-Z strands throughout the production process.In telecom wires, visual fibers or visual fiber ribbons are often utilized being a medium to transmit visual impulses. These wires frequently have a central strength fellow member, for instance a steel rod or stuck steel cables, that expands longitudinally across the main axis in the cable. As shown in FIG. 1 (from U.S. Patent No. 5,229,851, which can be integrated by guide), main power member 2 is meant to endure and resist any tensile or compressive pressure applied axially for the cable 1. The main strength member 2 is usually encircled with a covering 3, which might work as a cushioning material. A plurality of plastic material barrier pipes 4-8 encompass addressing 3 and loosely home safeguard optical fibers or ribbons inside them.
A binder thread or threads 17 and 18 are often contra helically applied around buffer pipes 4-8 to hold them set up. A water swellable tape (not demonstrated) might be applied within the barrier pipes to block water ingress to the cable. An overall plastic jacket 20 then addresses the valuables in visual fiber cable 1. When the designed installation for cable 1 demands additional mechanical power, the cable may include extra strength members in the form of armor or power yarns 19 positioned intermediate the water swellable adhesive tape as well as the coat.As shown in FIG. 1, barrier tubes 4-8 are generally covered about main power member 2 inside a change helix or “S-Z” style. The places in which the stranded tubes change path (e.g. from an “S” to your “Z”) are known as reversal points. S-Z stranding of barrier pipes generally, and also the reversal factors in particular, are beneficial for obtaining the cable midspan. Which is, because of the S-Z stranding, one or maybe more visual fibers inside the cable may be “tapped” at the reversal points without needing to sever the cable or to handle significant reconfiguration. The S-Z stranding provides adequate excess of pipe length to make the tap easy by opening the side from the cable at a point along its duration without losing the preferred slack within the ribbon models or optical fibers within the pipe that is certainly opened up.
Therefore, taps in an S-Z stranded cable can be made without having interrupting other pipes or ribbon models.To ensure that the optical fibers within the buffer tubes usually are not put through twisting anxiety, which can cause unwanted attenuation, a parameter in the S-Z stranded barrier tubes known as “lay length” needs to be monitored. Bending anxiety is a loss mechanism in optical fibers that could happen when the cable is subjected to tensile causes, possibly from installation or heat, or compression forces. Bending anxiety could cause transmission reduction inside the optical fibers. The S-Z strand of barrier tubes in an optical fiber cable may take a number of types. Each ‘S’ turn may be implemented immediately by a reversal to your ‘Z’ stranding path. Alternatively, there could be a number of helical transforms among reversals. Generally, then, the average lay length is defined by the distance among reversal points divided by the quantity of transforms between reversals.The particular set length of every person S-Z stuck tube will vary through the average set duration by a little bit because of additional twisting and processing conditions. That is certainly, the lay duration of any given tube, could be essentially compared to the typical set duration, being a given tube could make greater than a whole quantity of transforms between reversals. As an example, inside a cable with 6 different coloured barrier pipes, one becoming red, and all S-Z stuck around a central fellow member, the red-colored tube may be towards the top or at the 12o’clock place around the cable on the initially reversal point.
But at the following reversal stage the red-colored pipe may be in the 6 o’clock position in the cable, 3 tubes taken off the 12 o’clock position. Therefore, the red pipe went one half transform more between reversals. This fifty percent-transform should be within the set duration computation for the most accuracy. Thus, the actual set period of a particular S-Z stuck Fiber Coloring Machine is composed of a number of components and will be determined to close approximation by:Set Length = D/N,where:N = N’ n/T in which D will be the axial distance between the reversal factors, N is the number of transforms between reversals, and N’ is the number of whole transforms in between the reversal factors; n is the amount of pipes which a provided tube is offset from the angular position around the previous reversal stage, measured in the direction of rotation; and T will be the total quantity of barrier tubes.To safeguard towards twisting anxiety on the visual fibers, the lay length of the S-Z stuck buffer tubes is examined on finished cable to ensure the lay length is inside appropriate specs. The best way to check the lay duration on finished cables would be to strip back the coat and other levels in the cable within the buffer pipes. It is far from sufficient to achieve this on the cable ends as the start-up and complete of the stranding process may have been completed at problems that change from the rest of the cable. Rather, set duration has zzgjup calculated manually throughout the production procedure right after stranding. The line operator will make the duration measurement while strolling alongside the progressing cable, which had been simple enough to complete precisely simply because line rates of speed had been slow. More recently, nevertheless, line rates of speed have risen significantly, creating this kind of manual way of measuring inaccurate. One alternative is to stop the line occasionally to adopt measurements.