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THE INDIA RUBBER WORLD 



[November 1, 1914. 



VULCANIZING RUBBER BY ELECTRICITY. 



A FOOTWEAR REPAIR VULCANIZER. 



Electrical Vulcanizer. 



RAYMOND B. PRICE, whose name is well known in the 

 reclaiming industry, has been granted U. S. Pat. No. 

 1.081.330 for a process of vulcanizing rubber in which elec- 

 tricity is used for developing the necessary heat, the process 

 being specially adapted for vulcanizing such articles as belting. 



The illustra- 

 tion shows the 

 method used. 

 This is a circu- 

 lar vulcanizer 

 with a square 

 bar in the center 

 acting as a man- 

 drel. Around 

 this is wound 

 th'e belt to be 

 vulcanized to- 

 gether with a 

 metallic strip 

 which carries 

 the current. 

 Thus when the 

 belt is wound up 

 each side is in 

 contact with the 

 heating strip. 

 The current is 

 turned on through the metallic strip and it is gradually heated 

 by the resistance. 



In one experiment described an electrical current of 639 

 amperes and 1.13 volts was passed through the metal strip 

 for a period of 32 minutes. At the end of that time the strip 

 was uncoiled and the belt was found to be perfectly vul- 

 canized. The temperature rose during the vulcanization to 

 300 degrees F., the belt being covered with asbestos so as to 

 give a heat insulation. The material vulcanized was a sheet 

 of rubber packing of cheap stock, seven inches wide and 1/16 

 inch thick. 



The claims are for the apparatus comprising the mandrel 

 and strip of metal adapted to be coiled around the mandrel with 

 rubber intermediate between the coils, electrical connections 

 and a casing to retain heat. 



It appears also that Mr. Price has been devoting some atten- 

 tion to the vulcanization of such articles as boots and shoes 

 which are usually cured in ovens. British patent No. 10,695 of 

 August 26, 1914, has been 



granted to him for a process g ^T«"^-^m.v»wh>Wi^V i Wi . |j ^ tt ^ 

 of vulcanizing in which the 

 article to be vulcanized — for 

 example a boot— is placed 

 over a perforated last or tree 

 which in turn is connected 

 with an air pump or some 

 other arrangement for pro- 

 ducing a vacuum. 



In the cut the boot is shown 

 on the hollow and perforated 

 last, and sealed by the wire 17 

 at the top. The vacuum pipe 

 12 serves to remove the air 

 from the last, thus pressing 

 the boot close to it. The 

 effect may be heightened by putting on a pressure of air or steam 

 through the pipes 6 and 7. 



The special idea is to remove any air which may be entrapped 

 between the fabric and rubber layers before vulcanization. 



""THIS novel machine is constructed on the principles of the 

 * well-known tire repair vulcanizers, and is used for rubber 

 boots and shoes. Jt has four tubular legs which support the steam 

 table A, the six shoe mandrels B and the two boot mandrels C. 

 These parts are all chambered for steam which is generated by 

 the gas-heated boiler D. The screw clamps E hold the shoes in 

 place while being re-heeled. If a patch is to be applied, the shoe 



is placed on one of the mandrels, F , where it is held by the heel 

 clamp, G. The patch is held in place by the presser band H 

 and the stretcher lever /. Boots and shoes are re-soled by the 

 sole plate / and the holding clamps /. Boots are repaired on the 

 mandrels C and the patch is held in place by the presser band K, 

 which is tightened by a lever L. The machine has a steam gage, 

 water glass and safety valve. The preparation of the repair and 

 the subsequent vulcanization is very similar to that of the tire shoe 

 repair. [Smith & Arthur, Ashtabula, Ohio.l 



FEDERATED MALAY STATES EXPORT DUTY ON RUBBER. 



It is reported that the government of the Federated Malay 

 States proposes to arrange the export duty on rubber in such a 

 way that when the London price falls below Is. 6rf. per pound, 

 no duty will be charged. When the price attains 2s. the present 

 rate of 2^4 per cent, would be levied. 



ONE FOR THE POET. 



The poet sat in the front seat as the car sped over the highway 

 at a forty-mile clip. His hair streamed behind him as though 

 striving to reach his hat, long since flown, but he was happy, and 

 his soul surged with poetry. 



"Where are the Ships of Tyre?" he quoted, ecstatically. 



There came a sudden report from the off hind wheel. 



"Punctured, b'gosh !" replied the chauffeur. — Harper's Weekly. 



