Many auxiliary products encourage the production of foam in the dyebath. A quantitative study has been made of the effect of this foam on the flow of dye liquor through a textile package. It is shown that a build‐up of foam can almost stop dye‐liquor flow. Silicone antifoaming agents are shown to be very valuable in eliminating the deleterious effect of foam. The method of using this type of product is very important if the full effect is to be obtained. The mechanical properties of the foam are sufficient to explain the behaviour observed.
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Hadfield et al. (1961) studied this question.
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