ISO 1130:1975 pdf download.Textile fibres一Some methods of sampling for testing
1 SCOPE AND FIELD OF APPLICATION
This International Standard specifies several methods for preparing laboratory samples of fibres, and presents a limited treatment of the problem of drawing specimens for testing.
The field of application of each method is given at the beginning of the clause dealing with the method.
It is not possible for the coverage of each individual procedure to be fully comprehensive; in many instances,the selection of test samples or test specimens must necessarily be covered by the appropriate method of test.
The selection of length-biased samples is not within the scope of this International Standard, nor are particular requirements relating to the determination of commercial weights.
An annex and tables are given in this International Standard for general guidance in determining the size of the test sample to be taken In order that the determined sample mean shall have given confidence limits.
2 GENERAL DEFINITIONS
For the purposes of this International Standard the following general definitions apply. Definitions particular to different types of fibres will be found In the appropriate clause.
2.1 individual : Any single fibre that might be taken for the purpose of measurement.
2.2 population: The aggregrate of Individuals that it is desired to characterize in one or more particulars (for example : fibres contained In a bale of cotton; all the constituent fibres in a set of yarn cops).
2.3 zoning: When the population to be sampled is known to vary from part to part with respect to the property to be investigated, the individuals or groups of individuals In the population are taken at random from within the different parts or zones, chosen so that all variations of the property are represented in due proportion. This operation is known as zoning.
2.4 laboratory sample: A sample Intended to be representative of a large bulk of material, in the state in which it is sent to the laboratory. A convenient size of sample for many types of test Involving only small test specimens Is about 25 to 50 g; a larger amount will be required for tests involving relatively large test specimens.
2.5 laboratory test sample: That portion of fibres taken from the laboratory sample in such a way as to ensure its representative character and to provide a quantity small enough to be easily convertible Into test specimens.
2.6 test specimen: That part of the laboratory sample (yarns, fibres, etc.) which is tested at one time.
2.7 numerical sample: A sample in which all fibres in the population have an equal chance of being represented.
2.8 length-biased sample: A sample in which the chance of any fibre of the population being represented is proportional to the length of that fibre.ISO 1130 pdf download.