A couple of good mould companies in china photos I identified:
Image from web page 166 of “The manufacture of rubber goods : a sensible handbook for the use of producers, chemists, and other people” (1919)
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Identifier: manufactureofrub00heil
Title: The manufacture of rubber goods : a sensible handbook for the use of manufacturers, chemists, and other individuals
Year: 1919 (1910s)
Authors: Heil, Adolf Esch, W. (Werner), b. 1878 Lewis, Edward W. (Edward Watkin)
Subjects: Rubber Rubber business 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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Text Appearing Just before Image:
ulcanised in French chalk, and subsequently reduce to the 1 See also the write-up , Kombinierte hydraulische Kesselpresse Id theGummi-Zeitung, 1905, vol. xix. p. 1001. MANUFACTURE OF SOFT-RUBBER ARTICLES. 155 appropriate size by means of an eccentric punch, holes being at thesame time punched in them. The matrix which holds the knifeand the punch can be adjusted to take all sizes. A single man canpunch on an typical 8000 flat pedals in a day. Curved brake-rubbers with a tough-rubber inner layer are run on the machine inthe two various qualities, joined with each other by means of remedy,reduce up into pieces of the appropriate size, and vulcanised in Frenchchalk. The curved surface is buffed into shape on the lathe, bymeans of a shaped emery-wheel. Complex rubbers must bemade up and vulcanised in moulds. Strong bicycle-tyres are run on the tube machine and then vulcan-ised in moulds (fig. 70) under the hydraulic vulcanising press, endlesstyres getting created in suitable closed moulds, as also are cushion tyres.
Text Appearing Soon after Image:
Fig. 70. Perambulator tyres are also machined, and are then joined up andvulcanised in chalk in the open, or in moulds beneath the press. 9. Manufacture of Soft-Rubber Surgical Goods, and so on.—The manu-facture of air-cushions, water-cushions, mattresses, hot-water bottles,and also of gas-bags, constitutes one more division of the sector,to which it is now proposed to direct the readers attention. The 3 chief variables for good results in this branch are: (1) clean,dense mixings, free of charge from grit (2) calendered sheet of uniformthickness, and fabric closely proofed (3) cautious hand labour. The mixings in most frequent use are white ones. For cushions, e.g., the following mixings could be suggested:— Mozambique . ten,000 gras. China-clay 3,500 gms Sulphur . 1,200 „ Ceresin . 200 „ Zinc white . . six,500 ,, Magnesia usta. 200 „ The mixing is in component run into lengths of doubled sheet on thecalenders, and made up into cushions with cloth-impression and in 156 RUBBER MANUFACTURE. part produced
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