Bloomingに関する研究-1-
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概要
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It is often seen that, in the couse of manufacturing processes of rubber articles, blooming of the intermediate rubber materials is an impediment to these processes; for example, in the case of auto-tyre, bloom of rubber topped on the cord or bloom on the surface of tread rubber hinders adhesion and causes ply-separation on tread separation. Further, for rubber goods such as footwear which are built up by adhesion, blooming causes a trouble in manufacturing.<BR>It is generally considered that blooming of sulphur is caused by cooling down and supersaturation of sulphur which melted at the temperature of milling of rubber, by crystallization at the point of the surface where something has incited it, and by migration of the inner sulphur to the surface where the crystal forms a nncleus.<BR>The blooming which appears first in the part of rubber under treatment where the hand has touched can be prevented by covering the surface of rubber with cellophane and thus pushing rubber out of contact with the air. In foreign factories, the surface of rubber leaving rolls or a calender is covered with cellophane and thus adhesiveness is kept and, at the seme time, blooming is prevented. In a large-scale industry as auto-tyre manufacturing, non-blooming sulphur is used for this purpose.<BR>Non-blooming sulphur consists chiefly of Sμ in amorphous S (one of the varieties of Sul-phur with low solubility in rubber) and recently put on the market by Stauffer Co. and Monsant Co.<BR>The authors have studied under what conditions blooming occurs more readily and give the results obtained from their experiments on separation of non-blooming sulphur.
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