The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . be used as solvent, the advan-tages gained by the use of well-dried starch, and of the combinedpowdering and vulcanising machine, are nullifled by the deposition THE VULCANISATION OF RUBBER. 91 of moisture on the surface, caused by the rapid evaporation ofthe solvent and the consequent great decomposition of chlorideof sulphur which occurs on the moisture-laden starch. The hydro-chloric acid set free in this decomposition often dextrinises thestarch to such an extent that the material ac
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . be used as solvent, the advan-tages gained by the use of well-dried starch, and of the combinedpowdering and vulcanising machine, are nullifled by the deposition THE VULCANISATION OF RUBBER. 91 of moisture on the surface, caused by the rapid evaporation ofthe solvent and the consequent great decomposition of chlorideof sulphur which occurs on the moisture-laden starch. The hydro-chloric acid set free in this decomposition often dextrinises thestarch to such an extent that the material acquires an unpleasantblack surface in place of the well-known velvety gloss. The simplest method of getting rid of the unpleasant smell ofcold-vulcanised materials is to let them run for a few hours throughan airing apparatus in which air, heated to a temperature of about70° C, is driven past them, removing the smell. After-treatment of cold-cured waterproof with ammonia is ofdoubtful value, since certain impurities in the ammonia tend tomake the smell worse. If it be possible, the cold-cured material. Fig. 42. may be powdered with carbonate of magnesia, which absorbs theresidual acid, and takes away the unpleasant odour. The Cold-Vulcanising Shop.—This shop is situated in a separ-ate building, primarily on account of the great risk of fire. Theconstruction should be such that the building is provided with adouble floor; the upper one, which is best formed of perforated iron-plates, stands about 1J metres above the lower one, which is brickedor concreted, and on the ground-level. The space between thefloors can be completely opened by means of valves, so that acurrent of air can pass through and carry away the vapours whichdescend through the upper perforated floor. The side-walls shouldhave large windows all round, provided with glass jalousies, toensure a vigorous circulation of air. The most suitable machine for the cold-vulcanisation of water-proof cloth, reproduced in fi
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