Composite yarn, method for obtaining same and resulting textile structure

摘要

A composite yarn for technical or industrial use, particularly suitable for textile webs, is uniformly coated with a polymer and exhibits improved fir behavior and improved resistance to sheath stripping. The yarn may be obtained by a process where a continuous yarn, obtained by spinning a large number of fibers, such as about 100 to 600 fibers made of an organic or inorganic material, of a suitable yarn diameter, such as between about 1 to 10 micrometers, is subjected to a process for mechanically opening the yarn by splaying, to uniformly spread out and separate the fibers, including inner layers of the fibers, without impairing functional properties of the yarn, simultaneously with or prior to coating of the fibers by a polymer material having a viscosity between 1000 and 10,000 mPa·s, and formed to have a circular cross-section and uniformly distributed fibers throughout the cross-section of the polymer material to limit desheathing of the yarn.

主权项

1. A process for manufacturing a composite yarn, comprising:
subjecting a continuous yarn, obtained by spinning a large plurality of fibers made of an organic material or silica or glass, to a process for mechanically opening the yarn by splaying, to uniformly spread out and separate the fibers, including inner layers of the fibers, without impairing functional properties of the yarn; coating the fibers with a primary coating consisting of plastisol that consists essentially of a dispersion of a chlorinated polymer material selected from the group consisting of polyvinyl chloride, superchlorinated PVCs, polyvinylidene chlorides, and chlorinated polyolefins, a plasticizer, and a fire-retarding filler, the coating having a viscosity between 1000 and 2000 mPa·s measured at 25° C. using a Brookfield RVT viscometer at 20 rpm with a No. 4 spindle, simultaneously with or after subjecting the continuous yarn to the process for mechanically opening the yarn by splaying; and forming a composite yarn having a circular cross-section and uniformly distributed fibers throughout the cross-section of the polymer material to limit desheathing of the yarn.