The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . nmiediately under the press-plate. In the constructionof liydraulic presses the steam-plates, by which the pressure isapplied to tlie articles, and wliicli must be absolutely smooth and 7<5 RUBBER MANUFACTURE. true, should not be cast in one piece with the top plate, but shouldbe mounted separately, and insulated from it by means of the large presses the top-casting is preferably built up of separateparts, and not in one single piece as in fig. 37, for with this formthe pl
The manufacture of rubber goods : a practical handbook for the use of manufacturers, chemists, and others . nmiediately under the press-plate. In the constructionof liydraulic presses the steam-plates, by which the pressure isapplied to tlie articles, and wliicli must be absolutely smooth and 7<5 RUBBER MANUFACTURE. true, should not be cast in one piece with the top plate, but shouldbe mounted separately, and insulated from it by means of the large presses the top-casting is preferably built up of separateparts, and not in one single piece as in fig. 37, for with this formthe plate may easily be fractured, when heated and under pressure,owing to unev^en expansion. The upper and lower plates areindependently heated, each being provided with a separate pressuregauge. In order to cool down the plates rapidly, after steam hasbeen blown oft, an apparatus may also be used by means of whicha current of cold air is passed into them through a pipe from anexhauster. The goods to be vulcanised are built up on the press-table, the proper size being secured and the necessary support given. Fig. 39. to the sheet by means of accurately planed square-iron bars. Onto]) of the article is placed a thin enamelled steel sheet about fV ^^^^thick, which lies smoothly under the press and gives to the rubbersheet a fine polished upper surface. It should also be mentionedthat the draw-plate should be of sufficient size, in order that whenit is under the press its ends ma}^ project to a distance of about 25 cm.,so that in the case of long articles, such as mats, the ends of theseparate pieces may be easily joined together and cured up intoone piece. In the large presses, particularly those used for belting,the side rods should be adapted for easy removal, so that endlessbelts and conve^^or^ may, if necessary, be put in from the side. Thelarge belt presses with an intermediate plate are not to be recom-mended, since, owing to the length of the press, an uneven strainis produced
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Keywords: ., bookcentury1900, bookdecade1910, bookidmanufactureo, bookyear1919
