. Rubber hand stamps and the manipulation of rubber; a practical treatise on the manufacture of India rubber hand stamps, small articles of India rubber, the hektograph, special inks, cements, and allied subjects . This dissolves out all soluble matter andwashes away mechanically the chips, dirt, may be present. The whole operation is oneof main force. The caoutchouc is torn and dis-tended and delivered as a rough perforated is passed repeatedly through the machine, therollers being gradually brought closer together, orelse different sets of rolls are used, set to different
. Rubber hand stamps and the manipulation of rubber; a practical treatise on the manufacture of India rubber hand stamps, small articles of India rubber, the hektograph, special inks, cements, and allied subjects . This dissolves out all soluble matter andwashes away mechanically the chips, dirt, may be present. The whole operation is oneof main force. The caoutchouc is torn and dis-tended and delivered as a rough perforated is passed repeatedly through the machine, therollers being gradually brought closer together, orelse different sets of rolls are used, set to different 38 RUBBER HAND STAMP MAKING degrees of fineness. The wash water passes througha screen which catches any small detached frag-ments of gum. Other types of machines have been introduced;the above is a representative form. The rough sheets must now be perfectly dried, aswater impairs the final product. This is done indrying rooms by steam heat, generally, at a temper-ature of about 90° F. (32° 0.) The windows, ifthere are any, are painted to exclude sunlight,whichoperates to deteriorate raw gum. When absolutelydry the caoutchouc is removed and stacked awayfor use. ».^.i>in^^tn^k^;). Masticating Machine. To prepare pure gum for the manufacture ofsheet rubber and as a starting point for many otherpreparations, the india rubber is ^ masticated in AND THE MANIPULATION OF HUBBER. 89 special apparatus. The machine consists of a fixedcylinder within which is a corrugated roller seteccentrically and rotated by power. The perfectlydry sheets in the masticator are pressed and rolledand ground and produce a mass of even the welding or cohering action again appearsin its fullest development. The perfect dryness ofthe mass enables it to keep reuniting as fast asdivided. The action is assisted by the heat gener-ated, which is not inconsiderable. Sometimes thecaoutchouc is warmed before introduction, andsometimes the roller is heated by passing steam
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidrubberhandstamps01sloa
