Enclosed an abstract from a technical paper, presented last year at Interwire (Atlanta). If you want to buy a copy contact "wire journal international".
Title: Twist and tension
Authors: Andy Blackmore, Roteq Machinery, Canada
Description: These two parameters, i.e. the ability of the product to twist around its own axis along with the tension that is required to make the product without issue, define the range of rotating equipment that can be considered for the process. Variable back-twist group twinners with a single- or double-twist take-up for Category 6e data cables will be used as an example, among others, to demonstrate the sensitivity of the choices
Location: Paper presented at WAI 75th Annual Convention, Atlanta, GA USA. Published in WJI, April 2006, pp. 98-102.