Single Twist machine generates one twist per rotation of flying arm. Winding distribution is handled by moving take-up spool back and forth. So take-up spool also works as traversing. There is no capstan in singletwist buncher machine. So Take-up spool is diretly pulling from pay-off bobins via flying arm. Both Take-up spool and flying arm rotates in same direction. Twisting pitch is adjusted via difference in rotation speed between flying arm and take-up spool. Single Twist buncher is the second fastest twisting machine in cable production. Singletwist machine may be used for several different applications. Bare conductors and insulated cable cores can be twisted at comparingly high speed level. Twinning is possible but productivity is much less than double twist buncher machine. Strands are pulled through twisting plate over flying arm. There are two flying arms on singletwist machine. One for twisting , the other one is for weight balancing. Could be only one flying arm as well as long as balance issues are solved. Twisting occurs at the entrance of flying arm. Twist per minute equals the rotation of flying arm. The fastest can be fairly 800-1000rpm. In General, singletwist machines are referred by the size of Take-up spool. "ST800" for example, points that take-up spool flange size is 800mm.
Singletwist machine relays fine electronic measurement devices during process. Pulling speed of take-up drum changes continuously during process as the drum is filled and diameter of wound material increases. Pulling speed of take-up drum has to be measured simultaneously. Rotation speed of flying arm must be adjusted according to pulling speed in order to maintain stable layout length. Speed of take-up drum changes continuously during process.
Singletwist is a compact and reliable but still not best solution for large solid bare conductors. Construction of bundle better than a doubletwist but not as good as a rigid strander or a planetary. Total weight of take-up spool is limited. Therefore, over 1600mm flange size is not productive. Also, Production speed is decreased drastically by spool size. Vibration is an obstacle for singletwist bunching. Machine manufactuers use various solutions to that.
Best For: A singletwist machine is best for grouping telephone & data signal cables.
Versatility:SingleTwist buncher is versatile in compare to doubletwist machine. Number of strands has no limit as long as finished overall diameter stays within in the range of machine. Total weight of take-up spool is limited. Size of take-up spool is fixed by barrel length. Single Twist buncher is capable of multi layer stranding which is a good advantage over Double Twist buncher. Using diffeent flange size spools are possible .Application of foil or other wrapping materials is possible while twisting process which makes Single Twist buncher more productive. Changing processed material may require adjustments to flying-arm. Flyer arm should be balanced after installment for long-term healthy operation.
Single Twist buncher can be used for the production of Category5 and higher Local area network cables. Stable layout length makes it best choice for also grouping indoor and outdoor telephone wires as well as instrumentation cables such as JE-Y(st)Y.