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 use of rubber in surgery and dentistry, rubber tires, the hektograph, special inks, cements and allied subjects, also giving the sources of India rubber and its history .. . e inch with temperatures corre-sponding to steam of such pressures: . per square inch. Temp. Fahr. Temp. Cent. 275° 135° 284° 140° 293° 145° ° 149° The illustration, p. 64, shows a vulcanizer of moderntype made for rubber stamp work. In
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 use of rubber in surgery and dentistry, rubber tires, the hektograph, special inks, cements and allied subjects, also giving the sources of India rubber and its history .. . e inch with temperatures corre-sponding to steam of such pressures: . per square inch. Temp. Fahr. Temp. Cent. 275° 135° 284° 140° 293° 145° ° 149° The illustration, p. 64, shows a vulcanizer of moderntype made for rubber stamp work. In some recentvulcanizers the water and steam are excluded fromthe vulcanizing chamber, being contained withindouble walls forming a steam jacket and maintain-ing a constant heat within the chamber. Theseillustrate a point that has been much misappre-hended, namely that curing is independent of pres-sure or atmosphere. Because vulcanizers havegenerally been filled witli steam at high pressuremany have supposed that the steam or pressure hadsomething to do with their action. The fact is that 66 RUBBER HAND STAMP MAKING it is only the heat due to the steam at such pressure-that is instrumental. Steam is a very powerfulradiator and absorber of so called radiant heat. Forthis reason an atmosphere of steam maintains all. Steam Jacket Vttlcanizeb. parts of the vulcanizer at an even temperature andis to that extent advantageous. Its presence andtne pressure it generates are not by any means re-quired for vulcanizing. Its pressure is entirelywithout effect. To use a steam vulcanizer. water is AND THE MANIPULATION OF RUBBER. 67 the article in the press or mould is placed in it, andthe top is secured. Heat is then applied, best if onthe small scale, from a Bunsen gas burner gas,or oilstove. Either the pressure gauge or thermometermay be watched, and the flame turned up or downto keep it at the proper temperature. Moulding cannot be executed in the ordinaryclosed chamber
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Keywords: ., bookcentury1900, bookdecade1910, bookidrubberhandst, bookyear1912
