The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . vel with the maintransport rail, which runs the whole length of the vulcanising shopand connects it with the other shops in the factory; this arrange-ment is such that the loaded trolleys can be run straight from themain rail, over the turntables, on to the heater trolleys, thus doingaway with the heavy work of unloading and repacking in are four upright heaters in the shop, also of course of these are provided with steps leading up to an iron plat-form surrou
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . vel with the maintransport rail, which runs the whole length of the vulcanising shopand connects it with the other shops in the factory; this arrange-ment is such that the loaded trolleys can be run straight from themain rail, over the turntables, on to the heater trolleys, thus doingaway with the heavy work of unloading and repacking in are four upright heaters in the shop, also of course of these are provided with steps leading up to an iron plat-form surrounding the heater breast-high. Under the main railtrack is a tank, used for cooling down the moulds, the wholetrolley load being lowered into and hoisted out of the tank bymeans of a lifting tackle. In a smaller room the goods are packed 5 66 RUBBER MANUFACTURE. in chalk, the air being kept carefully free from dust by artificialventilation. In this room are also kept various kinds of iron boxesor trays to take the goods, these being put straight on to the trolleys k O E^ szT/j; o kl j: jaiiog J9log ieh:. I and not again unpacked before being cured. They are quite readyto undergo vulcanisation for the necessary length of time, whenrun into their respective heaters. Another room, D, is used fordrying and sifting the chalk used in the vulcanising process. Inthis room the trolleys are emptied, after vulcanisation, of all goods THE VULCANISATION OF RUBBER. 67 which have been cured in chalk. The chalk is then immediatelydried in the oven, put through a chain-pump into the revolvingsieve, and sifted; it is then ready for further use. A glance now at the heaters themselves. These should, ifpossible, be constructed to stand a steam pressure of six atmos-pheres, and the doors should be designed with a fairly wide flangewith a recess in order to give the packing a good firm hold, so thatit does not require to be renewed very often. The bolts for closingup the heater door should be fairly s
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