The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . upon by employing acylinder of about 43 cm. in diameter, com-pletely filling it with the masticated rubber,and only then forcing the steel spindle throughthe whole mass of rubber, the compactness ofwhich is by this means increased (fig. 81).The pressure necessary to drive the spindlethrough is about 260,000 kilos. The mouldsare then subjected to a gradually increasingpressure under the presses illustrated in fig. 80until the whole has become quite cool and ablock free from pores is produ
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . upon by employing acylinder of about 43 cm. in diameter, com-pletely filling it with the masticated rubber,and only then forcing the steel spindle throughthe whole mass of rubber, the compactness ofwhich is by this means increased (fig. 81).The pressure necessary to drive the spindlethrough is about 260,000 kilos. The mouldsare then subjected to a gradually increasingpressure under the presses illustrated in fig. 80until the whole has become quite cool and ablock free from pores is produced. The cylinders containing thecompressed rubber are no longer cooled down in a chamber bymeans of ice or cold air, on account of the large amount ofexpensive raw material which is kept lying idle during such aprocess, but they are immersed in a freezing-tank containing saltwater cooled down to a temperature of — 5° C. In fig. 82 is shown diagrammatically a modern freezing plantfor cut-sheet blocks (Haubolds system); with the aid of thisplant 320 kilos, of rubber can be completely frozen per Fig. 81, MANUFACTUEE OF SOFT-RUBBER ARTICLES. 175 In this diagram we see the compressor a, built in one piece withthe condenser, the evaporation pipes 6 in the refrigerator (salt-water reservoir) c, in which the freezing mixture (brine) is cooleddown till the temperature falls to — 12°C. in the evaporator. Ingeneral, the scale on which it is advisable to design the freezingplant is one which allows 30 to 35 square metres for the floor areaand 21 metres for the height of the cooling and storage space, andprovides for an artificial cooling capacity of 4000 calories at a salt-water temperature of — 12°C. A small pump d is coupled to thecompressor in order to supply the cooling water necessary for thecondenser. If a supply of main water is available for this purposethis pump is not necessary. The blocks are lifted in and out of the
Size: 897px × 2788px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidmanufactureo, bookyear1919
