THE INDIA RUBBER WORLD 



[May 1, 1920. 



DIAMOND FIBER FOR RUBBER WORKING EQUIP- 

 MENT. 



THE HARD, TOUGH, HOMOGENOUS MATERIAL with tCXture closely 

 resembling horn, known as "fiber," is made from cotton 

 cellulose, chemically hydrated. This product has remarkable 

 properties and is being utilized by manufacturers everywhere in 

 a great variety of products. Somewhat as in the case of rubber, 

 new uses for it are daily being discovered. 



Among rubber manufacturers fiber is being used for making 

 such equipment as inner tube trays, bulb trays, books, boards, 

 barrels, compound boxes and trucks. For all these purposes it 

 is practically indestructible and for many other uses it is su- 

 perior and less expensive than steel, brass, iron, tin, wood, vul- 

 canite or leather. It is impervious to oil, grease or ordinary 



Standard Rubber Bulb Tray. 



organic solvents, is unaflfected by severe vibration, and may be 

 worked into almost every conceivable form just as metals are 

 machined. It cannot, however, be molded. Its tensile strength 

 varies from 12,000 to 15,000 pounds per square inch and its 

 resistance to compression, about 30,000 pounds per square inch. 

 Its dielectric strength is approximately 200 volts per mil- 

 limeter of thickness. The color incorporated in the material 

 is permanent, the natural colors being gray, black and dark 

 red, and the usual forms are sheets, rods and tubes, also special 

 forms such as gears, bushings, washers, etc. 



Sheet Stock Seasoning Book 



Fiber is especially adapted to use in rubber manufacturing 

 because it eliminates all risk of damage to the uncured rubber 

 by its freedom from splinters or roughness since fiber does not 

 dent, split or crack and has a smooth, polished surface. 



Another hydrolized cellulose fiber product of much interest to 



rubber manufaclurers is that known as rubber parchmoid. This 

 is a substitute for holland cloth at a cost of about 60 per cent less. 

 It is strong and pliable with highly finished surface to which 

 rubber will not adhere. It is water, air and oil proof and is 

 especially suited as a wrapper for raw rubber. 



The accompanying illustration shows a standard fiber bulb 



Rubber Compound Bo.x. 



tray in which impressions are made of the same shape as the 

 uncured bulbs. A fiber angle frame is fastened around the 

 bulb holder. This frame is made flat on top and bottom so 

 that the frames can be stacked when not in use. Trays are 

 usually made to hold 72 bulbs. Powdered soapstone is not 

 necessary in using these trays. 



Fiber seasoning books are made in dimensions as required. 

 They are constructed with 1/16-inch fiber bottom. The wood 

 frame is completely covered with fiber angles and reinforced 

 with iron corner castings. There is a special construction for 

 holding the leaves in place, and new leaves can be put in the 

 book in less than three minutes. One type of book is specially 

 designed for use in rubber footwear factories. 



Inner Tube Seasoning Tray'. 



Fiber compound boxes are made extra strong to withstand 

 hard usage in rubber mills. Fiber not less than .090 to .100-inch 

 in thickness is used. The moldings are covered with metal and 

 the corners protected with heavy steel castings. Snugly fitting 

 joints prevent leakage or sifting of the contents and there are 

 no projections to catch particles of the contents when the com- 

 pound is dumped into the mixer. The boxes being slightly 

 tapered can be nested when not in use ; 24 by 18 by 12 inches is 

 the standard size for compound boxes. 



Inner tube trays have fiber bottoms with fiber angles securely 

 riveted to the bottom. The flat, smooth heads of the rivets are 

 on the inside of the tray. Two-inch hardwood molding covered 

 with metal is used, with iron castings on the corners. These 

 trays cannot splinter because there is no exposed wood and 

 therefore the rubber tube is protected from puncture or injury. 

 The usual dimensions of inner tube trays are 2 inches deep by 

 16 inches wide by 120 inches long. 



The Department of Agriculture announces that after 

 February 16, 1920, persons requesting the classification and cer- 

 tification of cotton, according to the Cotton Futures Act as 

 amended by the Act of March 4, 1919, shall pay a fee of forty 

 cents per bale. 



Index to "Rubber Machinery" will be sent free upon request. 



