Some comments on the application of irregularity of yarns
From the I.W.T.0. co-operative experiments on yarn irregularity it appeared that the visual appreciation of the cloth, manufactured from the yarns S, T and V was well conformable to the "overal1 irregularity" of the mass per unit length of the yarns. There is, however, an alternative possibillity of obtaining an impression of the evenness of the yarns which proves to be in accordance with the appreciation of the cloth. As regards the estimation of regularity by visual judgment, the following remarks can be made: 1) An appreciation of a great length of yarn is obtained in a small compass. 2) If one looks at a certain yarn element of e.g. a weft thread, one compares this involuntarily with neighbouring yarn elements lying in adjoining weft threads. Accordingly one does not compare two successive yarn elements of the same thread (which do not differ appreciably as a rule), but elements of this thread lying much further apart, viz. at an average distance of the width of the fabric. A similar line of thought can be applied to the warp threads.
Historisch materiaal TNO
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