Monday, May 30, 2011

THE ANALYSIS OF FINISHES

       It will be realized from the preceding pages that the finish on a fabric may contain a wide range of substances most of which are of such a character that they do not lend themselves easily to exact identification . Commercial finishes usually have a basis or carrier of starch gum to resin which confers more or less stiffness and acts as a binder for other ingredients . Its stiffness and handle depend on the actual basis present the percentage applied and the method of application depend on the viscosity of the paste or rather f the weight of the thickener per gallon necessary to give a paste of the usual consistency required for practical application . The thickening material may have been modified by chemical treatment which produces degradation products such as Dexedrine or glucose . Hygroscopic agents such as glycerine sodium lactate or Manning may be added . For certain purposes sugar itself is used . Soaps fats waxes or oils may be present for some cloths filling compounds such as chalk talc or other weightings may be present . Antiseptics and antimissile compounds or in recent years anti vermin compounds may be used whilst moth proofing agents are common.
    It is therefore at the present time very difficult to work out a general scheme of analysis which will systematically lead to the orderly detection of the components. Indeed the main element in any such scheme must be experience in the analysis if sizes and thickening's.
Probably the greater the experience the less is any rigid scheme adopted .

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