The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . ler, which can beadjusted to any width and thickness of sheet. In this way a sheet absolutely uniform in surface and thicknesscan be prepared; it is safest to cure such sheets in the thickness of the sheet which can be made in this way variesfrom ^Q mm. to 15 mm. Thicker sheet should receive a preliminaryvulcanisation under the press, as referred to below. In water- 212 RUBBER MANUFACTURE. bath vulcanisation the iron case in which the sheets are packedshould be large enoug
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . ler, which can beadjusted to any width and thickness of sheet. In this way a sheet absolutely uniform in surface and thicknesscan be prepared; it is safest to cure such sheets in the thickness of the sheet which can be made in this way variesfrom ^Q mm. to 15 mm. Thicker sheet should receive a preliminaryvulcanisation under the press, as referred to below. In water- 212 RUBBER MANUFACTURE. bath vulcanisation the iron case in which the sheets are packedshould be large enough for the water to circulate freely round thesheets, A thick cast-iron plate, planed smooth, serves as a base onwhich the separate sheets of foil-covered rubber of equal size arelaid, care being always taken to avoid creases; it is not advisableto vulcanise more than fifteen to eighteen sheets each 3 mm. thick,in a single case. To prevent the sheets from being displaced, acast-iron plate, planed smooth, and of the same size as the sheets, islaid on top of them. After vulcanisation—which, as stated at. Fig. 96. the outset, is regulated according to the quality and thickness ofthe sheet—the sheets are allowed to cool, and the tinfoil is thentaken off and melted down again. In the process of doing thisindications are obtained as to the correctness or otherwise of thevulcanisation. If the sheets are under-cured the tinfoil adherestightly to them, and the sheets themselves are of a dull, dirtygreenish-black colour, and leathery in texture; this mistake may bepartly rectified by re-vulcanising the sheet. If, on the other hand,the sheets have been over-cured they are as hard as glass, and moreoften still are porous and carbonised. Sheets more than 15 mm. thick are covered on the hot-benchwith tinfoil; this is not, however, pressed down at the edges, but MANUFACTURE OF EBONITE. 213 cut with the sheet itself to the right size for the frame mould whichis going to be used, and the she
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