The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . e the rubber into the screw at a uniformrate, and uniformly heated. Should the screw receive a little toomuch rubber at any time, the rolls are raised by springs and donot carry any more forward until the screw has worked ofi theexcess. By thic, arrangement the troublesome choking-up of themachine is done away with and inequalities in the thickness ofthe rubber tube are avoided. As the mandrel leaves the nozzle ofthe machine it passes on to the conveyor in front of it, by whichit is carr
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . e the rubber into the screw at a uniformrate, and uniformly heated. Should the screw receive a little toomuch rubber at any time, the rolls are raised by springs and donot carry any more forward until the screw has worked ofi theexcess. By thic, arrangement the troublesome choking-up of themachine is done away with and inequalities in the thickness ofthe rubber tube are avoided. As the mandrel leaves the nozzle ofthe machine it passes on to the conveyor in front of it, by whichit is carried along at a speed corresponding to that of the machine. 122 RUBBER MANUFACTURE. As soon as the whole length of mandrel is covered with rubberit is laid on a bench near at hand, and iti the case of hose withinsertion the second stage of manufacture is begun, namely, thewrapping round it of the insertion. The best way of doing this is still by hand, for all the insertionwrapping-machines hitherto constructed have the disadvantage thatthe layers of cloth must not overlap, for if they do the pressure of. Fig. 50. the top roller will tend to cause the inside coating to be penetratedby the cloth where the extra thickness, due to the overlap, the other hand, attempts to butt the edges of the canvas areattended by the danger of leaving the hose liable to be easily safest plan is, therefore, in tlie case of hose with hemp orcotton insertion, to proceed as follows:—The proofed canvas is cuton the bias into strips of such a width that they will go round thehose the required number of times ; these strips are united by over-lapping their ends to the extent of about 12-15 mm. and firmly MANUFACTURE OF SOFT-RUBBER ARTICLES. 123 rolling them together, and the long strip thus produced is now laidover the rubber sleeve (on the mandrel) and gradually rolled on toit, by means of small hand-rollers, round the whole circumference,until the beginning and end of the canvas ar
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