The rubber tree book . ingbetween the rough-cut, grooved-pattern rollers revolving atdifferent speeds (usually a gearing of i8 teeth in one roller and22 teeth on the other or 17 teeth to 21 teeth), there is a tearingand shredding of the mass, on which water is being constantlypoured from a pipe over the rollers. This washing and shred-ding removes not only dirt but much of the protein and non-rubber matter originally contained in the latex and graduallytransforms the cheesy mass into rough sheets of wet protein and starchy substances, if left in the rubber. MACHINERY AND MANUFACTU
The rubber tree book . ingbetween the rough-cut, grooved-pattern rollers revolving atdifferent speeds (usually a gearing of i8 teeth in one roller and22 teeth on the other or 17 teeth to 21 teeth), there is a tearingand shredding of the mass, on which water is being constantlypoured from a pipe over the rollers. This washing and shred-ding removes not only dirt but much of the protein and non-rubber matter originally contained in the latex and graduallytransforms the cheesy mass into rough sheets of wet protein and starchy substances, if left in the rubber. MACHINERY AND MANUFACTURE 189 would be apt to ferment and develop tackiness, and are there-tore best removed from rubber which is not intended to besmoked. It should be understood, however, that this removal in-volves an appreciable reduction in the ultimate weight of theproduct obtained. In the manufacture of sheets for smokingthe loss is not nearly so great. It might surprise somemanagers if they realized what the total difference amounted. Fig. 49.—Robinsons Washing-mill, Belt-driven. to in the course of a year. If we take it at i per cent, we shallnot be very far astray, and with rubber at four shillings andtwopence per pound the difference is equal to one halfpenny perpound. To look at it in another way, if the annual crop ofrubber is two hundred thousand pounds, the i per cent, lossor gain is equivalent to two thousand pounds of dry rubber perannum at least. The usual practice is to pass the coagulated latex threetimes through this macerating-mill before removing the roughsheets to the creping-mill. This creper is also a macerator typeof mill, but the cutting on the rollers is on a smaller pattern. igo THE RUBBER TREE BOOK The teeth on one roller being i8 and on the other 20, the shred-ding and tearing is less violent than in the macerator. In this,as in all the mills, water flows on to the sheets of rubber frompipes which discharge their flow of water from overhead on therubber passing throu
Size: 1883px × 1327px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidrubbertreebo, bookyear1913
