ISO 105-Z06:1998 pdf download – Textiles — Tests for colour fastness — Part Z06: Evaluation of dye and pigment migration

02-20-2022 comment

ISO 105-Z06:1998 pdf download – Textiles — Tests for colour fastness — Part Z06: Evaluation of dye and pigment migration.
4 Principle Fabric impregnated with test colorant alone, or with test colorant and migration inhibitor, is dried while partially covered with a watch glass, permitting differential drying and therefore, migration to occur. The degree of migration is evaluated by visual examination or by reflectance measurements of the covered and uncovered areas. NOTES 1 When drying conditions are not constant and/or uniform, uneven migration may occur, causing shade variations during a run, or shade differences between the face and back, or between the side and centre of the fabric. 2 The pad liquor composition may be modified by varying the amount or type of migration inhibitor and tested in the laboratory prior to the application on the range. The colorant concentration, the fabric and the wet pickup should be the same in the laboratory as used on the range. It is then possible to correlate the test results with the improvement experienced in practice. Two procedures are described: Procedure A. The fabric assembly is allowed to dry at room temperature. The procedure is very simple, but time- consuming (overnight). Procedure B. The fabric assembly is dried in a laboratory dryer or oven, either with, or without air circulation. This procedure is faster but somewhat more complicated than procedure A. 5 Apparatus and materials 5.1 Fabric pieces for dyeing. NOTE — For disperse dyes, vat dyes and pigments, generally the preferred fabric is a blend of 65 %:35 % (m/m) polyester: cotton gabardine or heavy twill, heat set, bleached and mercerized. For soluble dyes with affinity to cellulose (e.g. reactive dyes), the preferred fabric is a bleached and mercerized 100 % cotton gabardine or heavy twill. However, any other fabric intended for use on a continuous dye range may be chosen. 5.2 Balance, capable of weighing to an accuracy of 1 mg. 5.3 Laboratory padder. 5.4 Glass plate, 350 mm x 600 mm, for procedure A. 5.5 Watch glasses, 90 mm diameter with 22 mm arch punch. 5.6 Laboratory pin frame, for procedure B.

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