M00020608
New product
ISO FDIS 2061 2015 Edition, January 29, 2015 TEXTILES - DETERMINATION OF TWIST IN YARNS - DIRECT COUNTING METHOD
In stock
Warning: Last items in stock!
Availability date: 07/14/2021
Description / Abstract:
This International Standard specifies a method for the
determination of the direction of twist in yarns, the amount of
twist, in terms of turns per unit length, and the change in length
on untwisting, by the direct counting method.
This International Standard is applicable to
a) single yarns (spun and filament),
b) plied yarns, and
c) cabled yarns.
Separate procedures are given for each type of yarn. The method
is designed primarily for yarns in packages, but, with special
precautions, the procedures can be used for yarns taken from
fabrics. It is not suitable for the determination of twist in a
monofilament.
NOTE See also ISO 1890, which was prepared especially for the
needs of glass textile technology, and ISO 7211-4.
This International Standard covers the determination of twist in
plied and cabled yarns as follows:
a) in plied yarns: the final twist of the plied yarns and the
original twist of the single yarn before plying;
b) in cabled yarns:
— the final cabling twist of the yarn;
— the original twist of the plied yarn after plying, but prior
to the last stage of processing;
— the twist of the single yarn before plying.
If desired, the twist of single and plied yarn components, as
they lie in the final structure, can be determined by the special
procedure given in 10.5.7.
This International Standard is not applicable, except by
agreement, to yarns which stretch more than 0,5 % when the tension
increases from 0,5 cN to 1,0 cN per unit linear density of the yarn
expressed in tex. Such yarns can be tested under special conditions
of tension which are accepted by all parties interested in the test
results.
This International Standard is not suitable for products of
open-end spinning and intermingled (interlaced) multifilament
yarns.
This International Standard is not applicable to yarns which are
too large to permit their being placed in the clamps of the testing
apparatus without crushing or distortion severe enough to affect
the test results.