The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . s essentially in design from the earlierform of machine; in fig. 83 a cutting machine of the latest con-struction is shown; in this machine the cone-drive is again usedinstead of the friction-drive, because the desired results were notachieved satisfactorily on all sides. The machine can also be usedfor double blocks. The block is cut sjjirally by the knife of the machine into theform of a sheet, the speed of rotation of the block and the throw ofthe knife being regulated and adjusted ac
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . s essentially in design from the earlierform of machine; in fig. 83 a cutting machine of the latest con-struction is shown; in this machine the cone-drive is again usedinstead of the friction-drive, because the desired results were notachieved satisfactorily on all sides. The machine can also be usedfor double blocks. The block is cut sjjirally by the knife of the machine into theform of a sheet, the speed of rotation of the block and the throw ofthe knife being regulated and adjusted according to the thicknessof the sheet. The knife oscillates at the rate of up to 1200 times perminute; it is therefore most important to keep it well lubricated,and to see that the apparatus for keeping the knife and block wetwith soap solution is in perfect working order. The knives are 176 RUBBER MANUFACTURE. sharpened on a special emery-wheel machine, and the production ofa uniform sheet of rubber depends upon their having a true sharpcutting-edge. Soap solution is used in order to prevent the sheets. from sticking together when they are laid on one another whilewarm. The soap solution has no effect upon the later processes ofmanufacture. The various thicknesses of cut-sheet are distinguishedby numbers as indicated in the following table:— MANUFACTURE OF SOFT-RUBBER ARTICLES. 177 S^o. mm. No. mm. No. mm. No. mm. 1 . 4-15 6 . 1-66 11 . 0-63 16 . 0-33 2 . 3-26 7 . 1-40 12 . 0-54 17 . 0-20 3 . 2-58 8 . 1-15 13 . 0-44 18 . 0-18 4 . 2-35 9 . 0-95 14 . 0-41 19 . 0-165 5 . 1-85 10 . 0-84 15 . 0-37 20 . 0-143 The quality of cut sheet (German, Patentplatte; Italian, fogliasegata; French, feiiille anglaise) has undergone considerable reduc-tion. Sheet formerly made from pure Para has been graduallylowered in price, other mixtures of raw rubber being used insteadof Para, and at present sheet containing as much as 30 per cent, ofsurrogate is sold. Red cut-sheet is prepared by the addit
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Keywords: ., bookcentury1900, bookdecade1910, bookidmanufactureo, bookyear1919
