File:The manufacture of rubber goods - a practical handbook for the use of manufacturers, chemists, and others (1919) (14596536278).jpg

Identifier: manufactureofrub00heil (find matches)
Title: The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others
Year: 1919 (1910s)
Authors: Heil, Adolf Esch, W. (Werner), b. 1878 Lewis, Edward W. (Edward Watkin)
Subjects: Rubber Rubber industry and trade
Publisher: London : C. Griffin & Company
Contributing Library: Claire T. Carney Library, University of Massachusetts Dartmouth
Digitizing Sponsor: Claire T. Carney Library, University of Massachusetts Dartmouth

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olutely clean andfree from grit. Such a mixing for ordinary inner tubes would con-sist of rubber, which has been very carefully washed, and sulphur;for second qualities a cheaper compound can be used, but then itbecomes a question of reducing the porosity of the rubber to a mini-mum. Mixings containing ingredients which when added on themixing rolls are likely to flake, or to become granular, should berejected; on the other hand, the following mixings have been triedand can be recommended for the purpose:— (suitable for motoronly). cycle inner tubes Sulphur .Pitch 1,250 gms75 „ ParaSulphur . . 10,000 gms.900 „ C. Columbian . 5,000 „ Pitch B. Para Columbian 50 „ 5,000 „. 5,000 „ Manaos .Sulphur .SubstitutePitch 5,000 ,, 1,000 „ . 4,000 ,, 200 „ MANUFACTURE OF SOFT-RUBBER ARTICLES. 151 Inner tubes, which are cut out of sheet and made up on amandrel, should be made from sheet doubled on the calenders; thisis placed round the mandrel and cut from end to end of the latter
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by means of a special cutting machine, the cut edges being at thesame time pressed together so as to form an absolutely tight seam.The inner tubes are wrapped, just as they are made up, on thewrapping-machine (fig. 67), and are then vulcanised at 135° C. The I;2 RUBBER MANUFACTURE. tubes are drawn off the mandrels with the aid of compressed air,being at the same time turned; holes are made for the valves, andthe tubes are then cut to the right length, the ends solutioned witha pure Para solution, moistened with chloride of sulphur solution,and united. Motor tubes are often moulded, in which case thenecessary amount of gas-producing materials is put inside the tube;a mixture of bicarbonate of soda and tartaric acid in tabloid formbeing the most convenient agent to employ. The manufacture of pneumatic tyre outer-povers, on the otherhand, necessitates the use of considerable mechanical arrangements;in particular, a large number of moulds which are best made of caststeel. Of these there

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