The stranding technology supports the stranding of jelly-filled in addition to SZ Stranding Line styles. Stranding can be achieved either as being a stand-alone process or tandemized with the jacketing procedure. Sophisticated new technological solutions like torsion shaft lay-plate SZ stranding devices, double go across binders with an sufficient line control system permit a managed stranding procedure. Every single stranding disc is individually driven by way of a timing buckle without having intermediate gear.
The stranding process ensures in all circumstances reduced stranding stress change, precise and stable lay length and constant binding tension.
SZ Stranding is the procedure of twisting Tubes or Wires in to a cable structure under managed problems. The pipes/cables are carefully guided through several revolving discs. The disks will spin until up to 14 transforms in one direction is accomplished. The discs then reverse and perspective the pipe/cables as much as 14 transforms inside the opposing path. Because of this SZ stranding action, the pay out-off reels or even the consider-up do not have to spin to be able to manufacture a cable which results in higher line rates of speed. The pipes /wires are kept in place after SZ stranding with a polyester or perhaps a similar binder materials.
The Tensor ‘EXCEL STRAND’ SZ Stranding line has been developed after years of experience supplying stranding lines around the world. We stay on the cutting edge of technologies utilizing the newest electronic devices, drives and motor combinations to achieve repeatable and reliable performance. The SZ Stranding line may be set up in a number of different ways based on the customer requirements. Some stranding lines have 6 pay out-offs whilst other outlines have 24 or maybe more pay-offs. Other peripheral equipment can be added to the SZ Stranding line such as water blocking gel or tape, aramid yarn servers and perhaps even an extruder. Every line is custom built depending on the consumer needs and creativity.
A system and technique for determining the set period of S-Z stranded barrier pipes during the manufacturing process of a fiber optic cable without having reducing the production procedure. Images of your S-Z stuck buffer tube are captured having a camera. The pictures are delivered through the camera to your computer work station. The pc work station shows the images taken using the camera and executes coding modules that calculate the set length of the S-Z stranded buffer tube through the manufacturing process of the cable. Enter gadgets such as a mouse and a key pad can be utilized along with the procedures in the personal computer work station. By calculating the set length during cable produce, productivity could be taken care of whilst ensuring that the stranding of FTTH Cable Production Line does not drop out of threshold, that might bring about deleterious bending stress of optical fibers within the buffer tubes.
The current invention pertains to optical fiber cables that have barrier tubes organized in S-Z strands, and in specific a technique of determining the lay length of this kind of S-Z strands during the production procedure.In telecommunication cables, optical fibers or visual fiber ribbons are frequently used as being a medium to send out optical impulses. These wires usually have a central strength fellow member, such as a steel rod or stranded steel wires, that expands longitudinally over the main axis of the cable. As shown in FIG. 1 (from U.S. Patent No. 5,229,851, which can be integrated by reference), main strength fellow member 2 is intended to endure and resist any tensile or compressive pressure applied axially to the cable 1. The central power member 2 is frequently encircled with a addressing 3, which can work as a padding materials. A plurality of plastic buffer pipes 4-8 encompass addressing 3 and freely house safeguard optical fibers or ribbons within them.
A binder thread or threads 17 and 18 tend to be contra helically applied about buffer tubes 4-8 to carry them set up. A water swellable tape (not demonstrated) could be applied on the buffer pipes to block water ingress into the cable. A general plastic material coat 20 then covers the contents of optical fiber cable 1. If the designed installation for cable 1 demands extra mechanised strength, the cable may include additional power associates in the form of armour or strength yarns 19 positioned intermediate the water swellable adhesive tape and also the coat.As shown in FIG. 1, barrier pipes 4-8 are typically wrapped about main strength member 2 within a reverse helix or “S-Z” style. The places where the stranded tubes reverse direction (e.g. from an “S” to some “Z”) are known as reversal factors. S-Z stranding of barrier tubes generally, and also the reversal points particularly, are advantageous for obtaining the cable midspan. Which is, due to the S-Z stranding, one or more optical fibers in the cable could be “tapped” at the reversal factors while not having to sever the cable or to handle major reconfiguration. The S-Z stranding offers sufficient excess of tube duration to create the faucet simple by opening up the side from the cable at a stage together its duration without having losing the desired slack in the ribbon models or visual fibers within the pipe that is certainly opened.
Therefore, taps inside an S-Z stranded cable can be created without interrupting other tubes or ribbon units.To make sure that the visual fibers in the buffer pipes usually are not put through bending anxiety, which might cause undesirable attenuation, a parameter of the S-Z stranded barrier tubes called “set duration” needs to be monitored. Twisting anxiety is a loss system in optical fibers that could happen when the cable is put through tensile forces, possibly from installation or temperature, or compression forces. Bending stress might cause transmission reduction within the optical fibers. The S-Z strand of barrier tubes within an optical fiber cable may take a number of types. Every ‘S’ transform could be followed immediately by way of a reversal to some ‘Z’ stranding direction. Alternatively, there may be a number of helical transforms among reversals. Generally, then, the typical set duration is based on the distance between reversal factors split by the quantity of transforms among reversals.The actual lay period of each individual S-Z stranded tube will vary through the average lay length by way of a little bit due to additional twisting and handling conditions. Which is, the lay duration of any given tube, may be essentially compared to the typical lay length, being a given pipe might make over a entire variety of transforms between reversals. For example, within a cable with 6 different colored barrier tubes, one being red-colored, and all S-Z stuck around a main member, the red-colored pipe might be towards the top or on the 12o’clock position on the cable at the first reversal stage.
But in the next reversal point the red pipe might be at the 6 o’clock place around the cable, 3 tubes taken from the 12 o’clock place. Therefore, the red-colored pipe went one fifty percent transform much more between reversals. This half-transform should be within the lay length computation for the best precision. Thus, the actual lay length of a particular S-Z stranded Fiber Coloring Machine is composed of several elements and may be determined to seal approximation by:Lay Duration = D/N,in which:N = N’ n/T where D is definitely the axial range in between the reversal points, N is the amount of turns among reversals, and N’ is the number of entire transforms between the reversal factors; n is the amount of pipes which a provided tube is offset looking at the angular place in the earlier reversal point, measured in the direction of rotation; and T will be the complete quantity of barrier tubes.To safeguard against twisting stress around the optical fibers, the set length of the S-Z stranded buffer pipes is examined on completed cable to verify the lay length is inside appropriate specifications. The only method to look at the set length on finished cables would be to strip back the coat along with other layers in the cable within the buffer pipes. It is really not adequate to do this around the cable ends because the start-up and complete from the stranding procedure may have been completed at issues that differ from the remainder of the cable. Rather, set length has zzgjup measured manually throughout the production procedure right after stranding. The line operator makes the duration way of measuring whilst walking alongside the progressing cable, which had been reasonably easy to complete precisely simply because line rates of speed had been slow. More recently, nevertheless, line rates of speed have risen dramatically, making this kind of manual measurement incorrect. One option is to stop the line occasionally to adopt dimensions.