ANNEX VIIIMethods for the quantitative analysis of binary and ternary textile fibre mixtures
(referred to in Article 19(1))
CHAPTER 1
I.Preparation of laboratory test samples and test specimens to determine the fibre composition of textile products
5.SAMPLING YARN
5.1.Yarn in packages or in banks
Sample all the packages in the bulk laboratory sample.
Withdraw the appropriate continuous equal lengths from each package either by winding skeins of the same number of turns on a wrap-reel17, or by some other means. Unite the lengths side by side either as a single skein or as a tow to form the laboratory test sample, ensuring that there are equal lengths from each package in the skein or tow.
Subject the laboratory test sample to the pre-treatment.
Take test specimens from the laboratory test sample by cutting a bunch of threads of equal length from the skein or tow, taking care to see that the bunch contains all the threads in the sample.
If the tex of the yarn is t and the number of packages selected from the laboratory bulk sample is n, then to obtain a test sample of 10 g, the length of yarn to be withdrawn from each package is 106/nt cm.
If nt is high, i.e. more than 2 000, wind a heavier skein and cut it across in two places to make a tow of suitable mass. The ends of any sample in the form of a tow shall be securely tied before pre-treatment and test specimens taken from a place remote from the tie bands.