BS ISO 1136:2015 pdf free

BS ISO 1136:2015 pdf free.Wool- Determination of mean diameter of fibres
BS ISO 1136 specifies a method for the determination of the mean diameter of wool fibres, using an apparatus which passes a current of air through a bundle of fibres.
This International Standard is applicable to clean, unmedullated wool fibres dispersed in a uniform, open state. It provides a method particularly suitable for combed slivers. The dichloromethane extractable matter content of the specimen must not exceed 1,0 %. It is applicable to oil-combed slivers after cleaning
with an organic solvent.
The method described in this International Standard is less accurate for lambswool and for wool which is appreciably medullated (see Annex D) and heavily dyed wool.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles一Standard atmospheres for conditioning and testing
For the purposes of this document, the followving terms and definitions apply.
conditioned sample of fibres, representative of the bulk, from which the test specimens are weighed out
Note 1 to entry: In many cases, the laboratory sample will consist of one or more short lengths of sliver.
weighed amount of fibre which is packed into the constant volume chamber
Two alternative forms of apparatus are described: “constant flow” and “constant pressure”. Both forms of apparatus have the same arrangement of parts, as ilustrated in Figure 1.
The constant flow apparatus utilizes a specimen mass of 1,5 g; the flowmeter is adjusted to a fixed value and the fibre diameter is read off from the manometer scale. This scale is not linear since the successive intervals, corresponding to 1 um, decrease with the diameter.
The constant pressure apparatus utilizes a specimen mass of 2,5 g; the manometer is adjusted to a fixed pressure and the fibre diameter is read off from the flowmeter. The constant pressure apparatus gives a nearly linear scale in micrometres. Since less accuracy in weighing the specimen is required, this method has some advantages for mill use.BS ISO 1136 pdf download.