TWISTED LOW-EXTENSION YARN, METHOD OF ITS MANUFACTURING AND ITEM FROM IT Russian patent published in 2012 - IPC D02G3/00 

FIELD: textile, paper.

SUBSTANCE: yarn consists of a twisted combination of one or more polyolefin fibres and one or more low-extension reinforcing fibres. Used polyolefin fibres have tensile strength of approximately 7 g/denier or more and a module in extension of approximately 150 g/denier or more. Used low-extension reinforcing fibres are characterized with elongation by approximately 3.0% or less at the load making 50% of the maximum tensile strength of the fibre, during 200 hr at room temperature, defined by the testing method according to ASTM D6992. The method to make twisted low-extension yarn, including several stages. The first stage: production of one or more polyolefin fibres with tensile strength of approximately 7 g/denier or more and a module in extension of approximately 150 g/denier or more. The second stage: production of one or more low-extension reinforcing fibres that are characterised with elongation by approximately 3.0% or less at the load making 50% of the maximum tensile strength of the fibre, during 200 hr at room temperature, defined by the testing method according to ASTM D6992. The third stage: twisting of specified polyolefin fibres and low-extension reinforcing fibres together with multiplication factor of twisting of at least in approximately 0.5 twists of specified one or more low-extension reinforcing fibres by inch (by 2.5 cm) of the specified one or more polyolefin fibres.

EFFECT: twisted low-extension yarn, an item from this yarn, and yarn made according to the proposed method have a lower trend to tension, higher strength properties and more resistance to loads under severe conditions.

11 cl, 1 dwg