Abstract
Abstract The importance of starch in the sizing of cotton warps depends very largely on the tenacity with which it binds the hairs in the yarn together. Since it is very difficult to find a material to which starch paste does not adhere very firmly on drying, it is presumed that its value in sizing is mainly determined by the mechanical strength of the dried deposit of starch itself. Various pure starch pastes and mixtures containing the common sizing ingredients have therefore been evaporated to thin films on sheets of polished brass or ferrotype, and the tensile properties of these films have been studied by means of an apparatus which automatically drew their load—extension diagrams. The films were tested at 20°C, and at 34% and 66% relative humidities. The results show that a starch film behaves very much like a ductile metal, such as copper, on loading and unloading, and that there is scarcely any difference between the elastic properties of maize, farina and sago. In dry air, the films are harder an...
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