EXPERIMENTAL STUDIES ON THE APPLICATION OF SOME BACTERICIDES AND FUNGICIDES FROM THE VIEWPOINT OF CLOTHES SANITATIONV. ON THE MILDEW RESISTANCE OF CANVAS RAINCOAT IMPREGNATED WITH PENTACHLOROPHENOL

摘要

The results of this experiment are summarized and discussed as follows:The mere cotton fabrics which were not dyed and not treated with any fungicide (No. 1) showed clear growth of mildew, in the dipping method in the mycelial suspension, both about the 24 hours washed materials and about the unwashed materials, and had almost no antimildew power.The merely dyed materials (No. 2) showed extreme growth of mildew on the cloth of in both washed and unwashed, but among the unwashed materials some showed somewhat weaker growth of mildew than No. 1 and seemed to have some antimildew power by dyeing.About the materials No. 3 treated with fungicide for preventing mildew, the unwashed ones showed almost no growth of mildew and were found to keep considerable antimildew power, but the antimildew power after 24 hours washing nearly disappeared and the extreme growth of mildew was shown.No. 4 materials, which were dyed and treated with fungicide showed almost the same results as No. 3, but in both washed and unwashed materials, the growth of mildew was fairly weaker than that in the No. 3, and seemed to notice the effects of dyeing and antimycelial treatment for mildew prevention.The rubberized and vulcanized cloth materials of the canvas raincoat (No. 5) showed no growth of mildew in both washed and unwashed ones and could be said to have nearly complete antimildew power.The yarns (No. 6) must have had somewhat antimildew power so long as they were treated by the fungicide, but in the mildew resistance tests of this methods did not show any antimildew power. If they were, however, tested by the quantity of mildew in proportion to the contained quantity of sodium pentachlorophenate, these yarns would show their corresponding antimildew power.According to the method of arranging on the mycelial mat, generally the growth of mildew on the materials was difficult in both unwashed and washed materials, and the sustaining power for mildew through this method was not much expected. However, for the purpose of examination of the breaking strength of the specimens exposed to the mildew, this method was essential.