The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . ,but should be provided with wheels so that they can be easilymoved backwards or forwards along two rails. The guides at thesides should be of iron; wooden or copper guides are not to berecommended. It is advisable to provide for the removal from therolls of mixings which readily stick to them, by means of a doctor,and for this purpose a steel bevelled rail screwed on to a strongwooden base about 6 cm. thick may be recommended. This issuspended, with the bolts fixed to the wooden side, i
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . ,but should be provided with wheels so that they can be easilymoved backwards or forwards along two rails. The guides at thesides should be of iron; wooden or copper guides are not to berecommended. It is advisable to provide for the removal from therolls of mixings which readily stick to them, by means of a doctor,and for this purpose a steel bevelled rail screwed on to a strongwooden base about 6 cm. thick may be recommended. This issuspended, with the bolts fixed to the wooden side, in the bearing-cases. The knife is depressed by means of a lever against the THE RAW MATERIAL. 45 middle of the roll, and cuts or scrapes off the mass of rubberfrom it. The mixing mill should, like the washing rolls, be provided withinstantaneous safety-clutches, as already described (figs. 12 and 12a),the most suitable being those based on the friction-clutch principle. A little further consideration may now be given to the mixingmills fitted with revolving sieves, which have been already men- tvirss.,. Fig. 20. tioned. (The rights of manufacturing these machines have beenacquired by C. G. Haubold, jun., a firm of engineers in Chemnitz.)The rolls are constructed as in an ordinary mixing mill, but abovethe front roll at a height of about 20 to 25 cm. (8 to 10 inches) thereis fixed a cylindrical sieve containing a revolving brush, drivenby toothed-wheel gearing from the axle of the roll (fig. 21). Thecylinder can be raised in its bearings in a backward direction bymeans of an eccentric movement, in order to throw it out of sifted material falls into a funnel-shaped sieve fixed belowthe cylinder, and kept in continuous vibration by means of an 46 RDBBER MANUFACTURE. eccentric so that the materials passing through the cylindricalsieve are passed through the second sieve on to the rubber. Acelluloid cover is fitted over the whole sifting apparatus in sucha way that it can b
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