The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . Fig. 27a. doubler in front of it. The calender rolls are 450 mm. in diameterand 1200 mm. long. The doubling drum is 1300 mm. in diameter,and the conveying-cloth 5 metres long. The pressure-roll is rubber-covered, and its distance above the drum can be adjusted by means 56 RUBBER MANUFACTURE. of movable bearings. Pressure is applied by means of weightedlevers. The drum is driven from the calenders, and the travellingtable derives its motive power from the same source. The rubbermixing, wh
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . Fig. 27a. doubler in front of it. The calender rolls are 450 mm. in diameterand 1200 mm. long. The doubling drum is 1300 mm. in diameter,and the conveying-cloth 5 metres long. The pressure-roll is rubber-covered, and its distance above the drum can be adjusted by means 56 RUBBER MANUFACTURE. of movable bearings. Pressure is applied by means of weightedlevers. The drum is driven from the calenders, and the travellingtable derives its motive power from the same source. The rubbermixing, which is run out between the rolls into the form of sheet,passes over the cloth conveyor on to the drum, round which it iswound until the correct thickness is reached, when it is cut off andpassed on to the table, by which it is carried away. It may be mentioned that the rubber sheets can be cut into. Fig. 28. strips on the calenders themselves, before being rolled up in therunning-cloth. To effect this a cutting apparatus is lixed betweenthe two vertical frames of the machine, about 18 cm. below thelevel of the middle of the second roll. The knives, fitted in boxesprovided with grooves, are fixed upon the spindle between thewheels, can be set to any desired width of strip, are kept inposition by means of set-screws and are pressed against tlie sheetby means of a spring, the strength of which can be regulated; thisarrangement results in the sheet being cut through clean. The spreading calenders shown in figs. 28, and 29 are nowgenerally used for impregnating insertions and fabrics with rubber, THE RAW MATERIAL. 57 since by the use of these a considerable saving of benzine as wellas of time is effected as compared with the spreading already mentioned, where the plant is a large one it is better touse a machine exclusively for frictioning. The use of threq rollsis nowadays
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