Specification of James Childs : manufacture of artificial gums.

  • Childs, James.
Date:
1860
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Childs : manufacture of artificial gums. Source: Wellcome Collection.

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    Childs Improvements in the Manufacture of Artificial Gums. cases weakens such compounds. To form the body of the gums, I prefer to use like compounds of india-rubber, sulphur, and Vermillion, to those usually employed; but variations may be made therein, and for the surfaces of the gums a different compound is employed; it may be a compound of india- rubber, or of gutta percha, or of the two together combined with sulphur and 5 coloring or other foreign matters. I prefer to use a compound consisting of,— 6 or 8 parts by weight of caoutchouc, 2 parts „ of sulphur, 6 parts ,, of vermillion, 10 12 parts „ of silicate of magnesia. Or 6 or 8 parts by weight of caoutchouc, 2 parts „ of sulphur, 5 parts „ of vermillion, Imparts „ sulphate of lime. 15 Other proportions of these matters may be used, and magnesia may be em¬ ployed in place of silicate of magnesia, and, in place of or in combination with india-rubber, gutta percha may be used, and other light or white substances as well as other coloring matters may be used in place of or in combination with those mentioned above, such as oxides of zinc. 20 My Invention, however, does not consist in the use of any peculiar compound of india-rubber, when employing compound india-rubber and sulphur hardened by heat in the manufacture of artificial gums, but in using a different material or compound of india-rubber or of gutta percha for the outer surfaces or parts of the gums which come in sight when in use to that which is used in producing 25 the other parts or main body of the same. In moulding a set of artificial gums, a thin layer of the surface material is first introduced into the mould, and then the mould is filled with the ordinary or different compound of india-rubber and sulphur, taking care that whatever be the outer material used, it will adhere to the india-rubber compound of 30 which the body is formed. The artificial gums thus moulded are then hardened by the application of heat, as is well understood ; or in place of proceeding in the manner above described, I first mould and harden the gums in the manner heretofore practised, and afterwards I roughen such parts as it is desirable to coat with a material of different color. To the parts thus roughened I apply 35 a composition such as that already described ; the composition being warmed so as to make it as plastic as possible, and being applied with care so that its adhesion to the original gum may be complete ; the whole is then enclosed in plaster, and submitted to the hardening process.