Core yarn with a core of high strength polyester material, produ

Details Core yarn with a core of high strength polyester material, produ Core yarn with a core of high strength polyester material, produ

1997-03-18

1998-04-07

Stryjewski, William

Textiles: spinning, twisting, and twining

Strand structure

Covered or wrapped

57903, D02G 302, D02G 306

Patent

active

057351104

ABSTRACT:
In core yarns, a) the polyester material of the core filaments has an average molecular weight corresponding to a relative solution viscosity of at least 1.9, and b) the core has a specific strength of at least 60 cN/tex, the core yarns producing a seam length to rupture of more than 800 cm in a sewing test under aggravated conditions.
The core yarns are obtainable by a process comprising the measures of: i) producing multifilament yarns based on polyesters having an average molecular weight corresponding to a relative solution viscosity of at least 1.9 by melt spinning polyester with a takeoff speed of at least 1500 m/min. and subsequently drawing under conditions such that the yarn has a breaking extension of about 15% and a breaking strength which corresponds to the maximum breaking strength obtainable for the yarn in question or is up to 30% below that value, and ii) sheathing this multifilament yarn with fibers of vegetable, regenerated or synthetic origin or mixtures thereof in a conventional manner in such a way that the multifilament yarn is virtually completely covered.

REFERENCES:
patent: 3410078 (1968-11-01), Freeman et al.
patent: 3828544 (1974-08-01), Alicer
patent: 4024895 (1977-05-01), Barron
patent: 4036003 (1977-07-01), Lowder et al.
patent: 4191211 (1980-03-01), Boyer
patent: 4191221 (1980-03-01), Boyer
patent: 4343334 (1982-08-01), Schulze et al.
patent: 5100729 (1992-03-01), Jacob et al.
patent: 5344710 (1994-09-01), Jacob et al.

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