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The stranding technology supports the stranding of jelly-loaded as well as FTTH Cable Production Line designs. Stranding can be carried out possibly as a stand-alone process or tandemized with the jacketing procedure. Advanced new technical options like torsion shaft lay-dish SZ stranding machines, double cross binders with the sufficient line manage system permit a controlled stranding process. Every single stranding disc is separately powered using a timing belt without intermediate equipment.

The stranding procedure ensures in every conditions low stranding tension fluctuation, precise and stable set duration and continuous binding tension.

SZ Stranding is the procedure of twisting Tubes or Wires in to a cable framework under controlled problems. The pipes/wires are guided through several revolving discs. The disks will rotate till up to 14 transforms in one path is achieved. The discs then change and twist the tube/cables as much as 14 turns inside the opposite path. Due to this SZ stranding action, the pay out-off reels or perhaps the take-up do not possess to spin so that you can produce a cable and also this brings about high line speeds. The pipes /cables are kept in location after SZ stranding with a polyester or a similar binder material.

The Tensor ‘EXCEL STRAND’ SZ Stranding line continues to be developed right after many years of encounter providing stranding lines all over the world. We stay on the innovative of technology using the latest electronic devices, drives and motor combinations to achieve repeatable and dependable performance. The SZ Stranding line can be set up in numerous different ways based on the consumer needs. Some stranding outlines have 6 pay out-offs while other lines have 24 or even more pay out-offs. Other peripheral gear could be added to the SZ Stranding line like water blocking gel or adhesive tape, aramid yarn web servers and in many cases even an extruder. Every line is custom made depending on the customer needs and imagination.

A system and technique for determining the lay duration of S-Z stranded barrier pipes throughout the manufacturing process of a fiber optic cable without having reducing the production process. Images of an S-Z stuck buffer pipe are captured having a camera. The photos are sent through the camera to a personal computer work station. Your computer workstation shows the photos taken using the camera and executes programming modules that determine the lay length of the S-Z stuck barrier tube throughout the manufacturing procedure for the cable. Input gadgets such as a computer mouse and a keyboard may be used in conjunction with the procedures in the personal computer work station. By measuring the lay duration during cable produce, efficiency could be maintained whilst ensuring that the stranding of Yarn Bind fails to fall out of tolerance, that might result in deleterious bending stress of visual fibers in the barrier tubes.

The current invention relates to visual fiber cables who have barrier tubes arranged in S-Z strands, as well as in particular a technique of determining the set length of such S-Z strands throughout the manufacturing procedure.In telecom cables, optical fibers or visual fiber ribbons tend to be utilized as a method to transmit visual signals. These cables frequently have a central strength fellow member, like a metal rod or stranded metal wires, that expands longitudinally along the main axis of the cable. As demonstrated in FIG. 1 (from U.S. Patent No. 5,229,851, which is incorporated by reference), main strength fellow member 2 is designed to endure and resist any tensile or compressive force applied axially towards the cable 1. The main strength member 2 is often encircled by a covering 3, which may function as a padding materials. A plurality of plastic material buffer tubes 4-8 encompass covering 3 and loosely home protect optical fibers or ribbons inside them.

A binder line or threads 17 and 18 are often contra helically applied about barrier tubes 4-8 to keep them in place. A water swellable tape (not demonstrated) could be applied within the buffer tubes to block water ingress in to the cable. A general plastic material jacket 20 then covers the contents of visual fiber cable 1. When the designed installation for cable 1 demands extra mechanised strength, the cable may include additional strength members as armour or strength yarns 19 positioned intermediate the water swellable adhesive tape as well as the jacket.As shown in FIG. 1, buffer tubes 4-8 are generally wrapped around central power fellow member 2 within a change helix or “S-Z” fashion. The places where the stuck pipes change path (e.g. from an “S” to a “Z”) are called reversal factors. S-Z stranding of barrier pipes generally, as well as the reversal factors particularly, are advantageous for accessing the cable midspan. That is certainly, due to the S-Z stranding, one or even more visual fibers inside the cable might be “tapped” at the reversal factors while not having to sever the cable or to handle significant reconfiguration. The S-Z stranding provides adequate extra of tube length to make the faucet simple by opening the side in the cable at a stage together its length without losing the desired slack within the ribbon models or optical fibers inside the tube that is certainly opened.

Therefore, taps inside an S-Z stuck cable can be created without disturbing other pipes or ribbon units.To ensure that the visual fibers inside the barrier pipes usually are not subjected to bending anxiety, which can result in unwanted attenuation, a parameter of the S-Z stranded buffer pipes known as “lay length” needs to be monitored. Bending stress is a loss mechanism in visual fibers that may happen when the cable is exposed to tensile causes, possibly from installation or heat, or compression forces. Bending anxiety could cause signal reduction in the optical fibers. The S-Z strand of barrier tubes within an optical fiber cable might take several forms. Each ‘S’ transform might be implemented instantly with a reversal to your ‘Z’ stranding direction. Additionally, there might be a number of helical turns among reversals. Generally, then, the normal lay duration is defined by the distance between reversal factors divided by the amount of turns between reversals.The particular set length of each individual S-Z stranded pipe will be different through the average lay duration with a small amount as a result of additional twisting and processing problems. That is certainly, the set length of virtually any tube, could be more or less compared to the average lay length, as being a given tube might make greater than a entire number of turns between reversals. As an example, in a cable with 6 different colored barrier pipes, one being red, and all S-Z stranded about a central member, the red pipe might be towards the top or at the 12o’clock place on the cable in the first reversal point.

But on the next reversal stage the red tube may be on the 6 o’clock position in the cable, 3 pipes taken off the 12 o’clock place. Therefore, the red tube went one fifty percent turn much more among reversals. This half-transform has to be contained in the set duration calculation for the most accuracy. Thus, the actual lay period of a given S-Z stranded SZ Stranding Line is composed of several components and can be calculated to seal approximation by:Set Duration = D/N,where:N = N’ n/T where D will be the axial distance in between the reversal points, N is the number of turns between reversals, and N’ is the number of whole turns in between the reversal points; n is the number of pipes which a provided tube is counteract from its angular position on the previous reversal point, counted in the direction of rotation; and T is definitely the total variety of buffer tubes.To protect against twisting anxiety around the optical fibers, the lay length of the S-Z stranded buffer tubes is checked on finished cable to confirm that this set duration is within appropriate specifications. The only way to look into the lay duration on completed wires is to strip back again the coat along with other layers within the cable over the buffer tubes. It is far from sufficient to get this done in the cable ends since the begin-up and finish of the stranding process may have been done at conditions that vary from the remainder of the cable. Rather, lay length has zzgjup calculated manually during the production process right after stranding. The line operator would make the length way of measuring while walking alongside the progressing cable, which was simple enough to accomplish accurately simply because line rates of speed were sluggish. More recently, however, line rates of speed have risen dramatically, making this type of handbook way of measuring inaccurate. One option is always to quit the line periodically to adopt dimensions.