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This is the original version (as it was originally adopted).
Consider the case of a fibre mixture which when qualitatively analysed gave the following components: 1. carded wool; 2. nylon (polyamide); 3. unbleached cotton.
Using this variant, that is using two different specimens and removing one component (a = wool) by dissolution from the first specimen and a second component (b = polyamide) from the second specimen the following results can be obtained:
Treatment with alkaline sodium hypochlorite does not entail any loss in mass of polyamide, while unbleached cotton loses 3 %, therefore d1 = 1·0 and d2 = 1·03.
Treatment with formic acid does not entail any loss in mass of wool or unbleached cotton, therefore d3 and d4 = 1·0.
If the values obtained by chemical analysis and the correction factors are substituted in the formula under point I.8.1.1 of Annex I, the following result is obtained:
P3% (cotton) = 100 — (10·30 + 50·00) = 39·70
The percentages of the various clean dry fibres in the mixture are as follows:
Wool | 10·30 % |
Polyamide | 50·00 % |
Cotton | 39·70 % |
These percentages must be corrected according to the formulae under point I.8.2 of Annex I in order to take account also of the conventional recovery rates and of the correction factors for any losses in mass after pre-treatment.
As indicated in Annex II to the Directive relating to textile names, the conventional recovery rates are as follows: carded wool 17·0 %, polyamide 6·25 %, cotton 8·5 %, also, unbleached cotton shows a loss in mass of 4 % after pre-treatment with light petroleum and water, Thus:
P3A% (cotton) = 100 — (10·97 + 48·37) = 40·66.
The composition of the yarn is therefore as follows:
Polyamide | 48·4 % |
Cotton | 40·6 % |
Wool | 11·0 % |
100·0 % |
Consider the case of a fibre mixture which when qualitatively analysed gave the following components: carded wool, viscose, unbleached cotton.
Suppose that using variant 4, that is successively removing two components from the mixture of one single specimen, the following results are obtained:
Treatment with alkaline sodium hypochlorite does not entail any loss of mass in viscose, while unbleached cotton loses 3 %, therefore d1 = 1·0 and d2 = 1·03.
As a result of treatment with zinc chloride/formic acid, the mass of cotton increases by 4 %, so that d3 = (1·03 × 0·96) = 0·9888 rounded to 0·99, (d3 being the correction factor for the respective loss or increase in mass of the third component in the first and second reagents).
If the values obtained by chemical analysis and the correction factors are substituted in the formulae given in point I.8.1.4 of Annex I the following result is obtained:
P1% (wool) = 100 — (48·75 + 41·02) = 10·23 %
As has already been indicated for variant 1, these percentages must be corrected by the formulae indicated in point I.8.2 of Annex I.
P3A% (cotton) = 100 — (1057 + 4865) = 4078 %
The composition of the mixture is therefore:
Viscose | 48·6 % |
Cotton | 40·8 % |
Wool | 10·6 % |
100·0% |
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