The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . igh electric tension, the test being applied by means of a spark inductor. The tested cases are varnished with an asphalt varnish, and arethen ready for use. 6. Moulded Ebonite Goods.—A large proportion of the articlesmade in ebonite are vulcanised in moulds. The process is carriedout in cases where metallic fabrics are pressed into the rubber, in 2l8 RUBBER MANUFACTURE. the same way as described for moulded soft-rubber goods. But,on the other hand, in order to economise in moulds and at
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . igh electric tension, the test being applied by means of a spark inductor. The tested cases are varnished with an asphalt varnish, and arethen ready for use. 6. Moulded Ebonite Goods.—A large proportion of the articlesmade in ebonite are vulcanised in moulds. The process is carriedout in cases where metallic fabrics are pressed into the rubber, in 2l8 RUBBER MANUFACTURE. the same way as described for moulded soft-rubber goods. But,on the other hand, in order to economise in moulds and at thesame time to produce smooth surfaces, certain articles may begiven a preliminary pressing in steel moulds and the vulcanisationcompleted in hot-air ovens, or in compo-moulds which, amongstother things, may be dressed with collodion solution to preventsticking to the mould. This process has found employmentespecially in the case of surgical goods; such articles as enemafittings, taps, screw-unions, cannulse and cigar holders are made inthis way, and it is not necessary to turn Ihem up on the lathe. Fig. 98. afterwards, since they come from the moulds with ^ perfectlysmooth surface. All articles which are mounted on mandrels canbe cured with comparative ease b}^ means of hot air. Naturallythey are not very smooth after vulcanisation, and have to be turnedup before a polish can be put on. On the other hand, in the caseof certain articles which are covered in tinfoil and vulcanised,or which are cured in moulds dressed with a special solution, abrilliant gloss can be produced, wliich gives the article a peculiarenamelled appearance, and does away with the necessity ofsubsequent polishing. Combs are made in the same way. Thesheet rubber is pressed into the comb moulds, between sheets oftinfoil, by means of heavy bent-lever presses (fig. 98), so as toform a flat piece of the shape of the comb, but without the teeth. MANUFACTURE OF EBONITE. 219 The teeth are cut out after vulcani
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